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Multifunctional Voltage Regulator and Watchdog
TLE 6363
Preliminary Data Sheet Overview Features * * * * * * * * * * * * * Step up converter (Boost Voltage) Boost Over- and Under-Voltage-Lockout Step down converter (Logic Voltage) 2% output voltage tolerance Logic Over- and Under-Voltage-Lockout Overtemperature Shutdown Power ON/OFF reset generator Digital window watchdog System Enable Output Ambient operation temperature range - 40 C to 125 C Wide Supply voltage operation range Very low current consumption Very small P-DSO-14-2 SMD package Ordering Code on request

P-DSO-14-2
Type TLE 6363 G Functional Description General
Package P-DSO-14-2
The TLE 6363 G is a multifunctional power supply circuit especially designed for automotive applications. It delivers a programmable step up voltage (Boost) and a precise 5 V fully short circuit protected output voltage (Buck). The TLE 6363 G contains a power on reset feature to start up the system, an integrated digital window watchdog to monitor the connected microcontroller and a system enable output to indicate the microcontroller window watchdog faults. The device is based on Infineon's power technology SPT(R) which allows bipolar and CMOS control circuitry to be integrated with DMOS power devices on the same monolithic circuitry. The very small P-DSO-14-2 SMD packages meet the application requirements.
Data Sheet V 1.1 1 2000-11-8
TLE 6363
Furthermore, the build-in features like under- and overvoltage lockout for boost- and buck-voltage and the overtemperature shutdown feature increase the reliability of the TLE 6363 G supply system. Pin Definitions and Functions Pin No. SO-14 1 2 3 4 5 6 Symbol Function R RO WDI GND SEN BUC Reference Input; an external resistor from this pin to GND determines the reference current and the oscillator frequency Reset Output; open drain output from reset comparator with an internal pull up resistor Watchdog Input; input for the watchdog control signal from the controller Ground; analog signal ground System Enable Output; open drain output from Watchdog fail-circuit with an internal pull up resistor Buck-Converter Compensation Input; output of internal error amplifier; for loop-compensation connect an external R-C-series combination to GND Supply Voltage Output; buck converter output; external blocking capacitor necessary Buck Converter Output; source of the integrated power-DMOS Boost Converter Input; input supply voltage of the IC; coming from the boost converter output voltage; buck converter input voltage Buck Driver Supply Input; voltage to drive the buck converter powerstage Boost Status Output; open drain output from boost PWM comparator Boost Converter Feedback Input; connect boost voltage divider to this pin; internal reference is the boost feedback threshold
7 8 9
VCC
BUO
VBOOST
10 11 12
BDS OVL BOFB
VBOFBTH
13 14 BOGND Boost-Ground; power signal ground; source of boost converter power-DMOS BOI Boost Converter Input; drain of the integrated buck converter power-DMOS
Data Sheet V 1.1
2
2000-11-8
TLE 6363
Pin Configuration
R RO WDI GND SEN BUC
VCC
1 2 3 4 5 6 7
14 13 12 11 10 9 8
AEP02960
BOI BOGND BOFB OVL BDS
VBoost
BUO
Figure 1
Pin Configuration (top view)
Data Sheet V 1.1
3
2000-11-8
TLE 6363
Block Diagram
TLE 6363 G
BOFB 12 14 Boost Converter BOI BOGND BDS
13 10
Biasing
VBoost
VREF
9 BUC 6 Buck Converter
VBOOST
BUO
8
7
VInternal
5 Reference Current Generator and Oscillator Reset, Window Watchdog and System Enable
VCC
SEN
3
R
1
WDI
2
RO
11 4 GND
OVL
AEB03008
Figure 2
Block Diagram
Data Sheet V 1.1
4
2000-11-8
TLE 6363
Absolute Maximum Ratings Parameter Symbol Limit Values min. Voltages Boost input voltage Boost output voltage Boost feedback voltage Buck output voltage Buck driver supply voltage Buck compensation input voltage Logic supply voltage Reset output voltage System Enable output voltage Current reference voltage Watchdog input voltage OVL output voltage max. Unit Remarks
VBOI VBOOST VBOFB VBUO VBDS VBUC VCC VRO VSEN VR VWDI VOVL
- 0.3 - 0.3 - 0.3 -1 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3
46 46 46 46 48 6.8 6.8 6.8 6.8 6.8 6.8 6.8
V V V V V V V V V V V V
- - - - - - - - - - - -
ESD-Protection (Human Body Model; R = 1.5 k; C = 100 pF) All pins to GND Temperatures
VHBM
-2
2
kV
-
Junction temperature Storage temperature
Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Data Sheet V 1.1
5
Tj Tstg
- 40 - 50
150 150
C C
- -
2000-11-8
TLE 6363
Operating Range Parameter Boost input voltage Boost input voltage; (normal operation) Boost input voltage; (normal operation) Boost input voltage Symbol Limit Values min. max. 40 35 36 4.5 V V V V - - 0.3 5 4.5 - 0.3 Unit Remarks
VBOI VBOOST VBOOST VBOOST
VBOOST increasing VBOOST decreasing
Boost- and Buck-Converter OFF - - - - - - - - - -
VBOFB Buck output voltage VBUO Buck driver supply voltage VBDS VBUC Buck compensation input
Boost feedback voltage voltage Logic supply voltage Reset output voltage System Enable output voltage Watchdog input voltage Current reference voltage Junction temperature Thermal Resistance Junction ambient
0 - 0.6 - 0.3 0 4.00 - 0.3 - 0.3 0 0 - 40
3.0 40 48 3.0 6.25
V V V V V
VCC VRO VSEN VWDI VR Tj
VCC + 0.3 V VCC + 0.3 V VCC + 0.3 V
3.0 150 V C
Rthj-a
-
120
K/W
-
Note: In the operating range, the functions given in the circuit description are fulfilled.
Data Sheet V 1.1
6
2000-11-8
TLE 6363
Electrical Characteristics 8 V < VBoost < 35 V; 4.75 V < VCC < 5.25 V; - 40 C < Tj < 150 C; RR = 47 k; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified. Parameter Symbol Limit Values min. Current Consumption Current consumption; see application circuit Current consumption; see application circuit typ. max.

Unit Test Conditions
IBoost IBoost
- -
1.5 5
4 10
ICC = 0 mA; IBoLoad = 0 mA mA ICC = 200 mA; IBoLoad = 50 mA
mA
Under- and Over-Voltage Lockout at VBoost UV ON voltage; boost and buck conv. ON UV OFF voltage; boost and buck conv. OFF UV Hysteresis voltage OV OFF voltage; boost conv. OFF OV ON voltage; boost conv. ON OV Hysteresis voltage
VBOUVON 4.0 VBOUVOFF 3.5 VBOUVHY 0.2 VBOOVOFF 34 VBOOVON 30 VBOUVHY
1.5
4.5 4.0 0.5 37 33 4
5.0 4.5 1.0 40 36 10
V V V V V V
VBOOST increasing; VBOOST decreasing HY = ON - OFF
VBOOST increasing VBOOST decreasing
HY = OFF - ON
Over-Voltage Lockout at VCC OV OFF voltage; buck conv. OFF OV ON voltage; buck conv. ON OV Hysteresis voltage
VBUOVOFF 5.5 VBUOVON 5.25 VBUOVHY
0.10
6.0 5.75 0.25
6.5 6.25 0.50
V V V
VCC increasing VCC decreasing
HY = OFF - ON
Data Sheet V 1.1
7
2000-11-8
TLE 6363
Electrical Characteristics (cont'd) 8 V < VBoost < 35 V; 4.75 V < VCC < 5.25 V; - 40 C < Tj < 150 C; RR = 47 k; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified. Parameter Symbol Limit Values min. Boost-Converter; BOI, BOFB and VBOOST Boost voltage; see application circuit Boost Voltage; see application circuit Efficiency; see. appl. circuit Power-Stage ON resistance Power-Stage ON resistance typ. max.

Unit Test Conditions
VBOOST
24.0
27.5
31.0
V
5 mA < IBoost < 100 mA; Tj = 25 C 8 V < VBatt < 16 V 5 mA < IBoost < 100 mA; 8 V < VBatt < 16 V
VBOOST
23
-
32
V
- - - 1.0 2.55 -2
80 0.6 - 1.3 2.7
- 0.75 1.4 1.8 2.85
%
Boost overcurrent threshold IBOOC Feedback threshold voltage VBOFBTH Feedback input current
Buck-Converter; BUO, BDS, BUC and VCC Logic supply voltage
VCC
4.9
-
5.1
Buck overcurrent threshold IBUOC Input current on pin VCC
Data Sheet V 1.1
0.7 -
8
0.95 0.2
1.2 0.5
ICC
Power-Stage ON resistance
RBUON
-
-
1.0
A mA
-
VCC = 5 V
2000-11-8
Power-Stage ON resistance
Efficiency; see. appl. circuit
- -
85 0.38
- 0.5
%
RBUON
IFB
- 0.4 0
RBOON
A V A
-
VBOI = 12 V IBoost = 25 mA 2 V < VBOFB< 4 V
V
1 mA < ICC < 250 mA; see. appl. circuit
ICC = 250 mA; VBoost = 25 V Tj = 25 C; IBUO = 1 A IBUO = 1 A
RBOON
IBoost = 100 mA Tj = 25 C; IBOI = 1 A IBOI = 1 A
TLE 6363
Electrical Characteristics (cont'd) 8 V < VBoost < 35 V; 4.75 V < VCC < 5.25 V; - 40 C < Tj < 150 C; RR = 47 k; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified. Parameter Buck Gate supply voltage; VBGS = VBDS - VBOOST Symbol Limit Values min. typ. - max. 10 V - 5

Unit Test Conditions
VBGS
Reference Input; R (Oscillator; Timebase for Boost- and Buck-Converter, Reset and Watchdog) Voltage on pin R Oscillator frequency Oscillator frequency Cycle time for watchdog and reset timing Reset Generator; RO Reset threshold; VCC decreasing/increasing
75 -
- 1.05
115 -
kHz - ms
tCYL = 100/fOSC
VRT
4.50
4.65
4.75
V
VRO H to L or L to H
transition; VRO remains low down to VCC > 1 V
Reset low voltage Reset low voltage Reset high voltage Reset pull up current Reset Reaction time Power-up reset delay time
VROL VROL VROH IRO tRR tRD
- -
0.2 0.2
0.4 0.4
V V
VCC - -
0.1 - 50 - 240 100 64
VCC + V
0.1 150 -
IROL = 2 mA; 2.5 V < VCC < VRT IROL = 0.2 mA; 1 V < VCC < VRT IROH = 0 mA
0 V < VRO < 4 V
-
A s
Data Sheet V 1.1
9
tCYL
VCC < VRT VCC 4.8 V
VR fOSC fOSC tCYL
1.3 85
1.4 95
1.5 105
V
-
kHz Tj = 25 C
2000-11-8
TLE 6363
Electrical Characteristics (cont'd) 8 V < VBoost < 35 V; 4.75 V < VCC < 5.25 V; - 40 C < Tj < 150 C; RR = 47 k; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified. Parameter Symbol Limit Values min. Watchdog Generator; WDI typ. max.

Unit Test Conditions
VCC VCC
Watchdog period Start of reset; after watchdog time-out Reset duration; after watchdog time-out Open window time Closed window time Window watchdog trigger time
L-input voltage threshold
VWDIL TWD tSR tWDR tOW tCW tWD
0.3 - - - - - -
- 128 64 64 32 32 46.4
- - - - - - -
System Enable Output; SEN Enable low voltage Enable low voltage Enable high voltage Enable pull up current
VSENL VSENL VSENH ISEN
- -
0.2 0.2
0.4 0.4
V V
VCC - -
0.1 - 240
VCC + V
0.1
ISENL = 2 mA; 2.5 V < VCC < VRT ISENL = 0.2 mA; 1 V < VCC < VRT ISENH = 0 mA
0 V < VSEN < 4 V
-
A
Data Sheet V 1.1
10
tCYL VCC tCYL VCC tCYL VCC
tCYL VCC
H-input voltage threshold
VWDIH
-
-
0.7
V V
- - 4.8 V 4.8 V 4.8 V 4.8 V 4.8 V 4.8 V
tCYL VCC tCYL VCC
2000-11-8
TLE 6363
Electrical Characteristics (cont'd) 8 V < VBoost < 35 V; 4.75 V < VCC < 5.25 V; - 40 C < Tj < 150 C; RR = 47 k; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified. Parameter Symbol Limit Values min. Boost Status Output; OVL Enable low voltage Boost feedback threshold voltage; typ. max.

Unit Test Conditions
VOVLL VOVLTH
- 2.3
0.2 2.45
0.4 2.6
V V
IOVLL = 1 mA; 2.5 V < VCC < VRT
See application circuit
Thermal Shutdown (Boost and Buck-Converter OFF)

Thermal shutdown junction TjSD temperature Thermal switch-on junction TjSO temperature
150 120 -
175 - 30
200 170 -
C C
- - -
Temperature hysteresis
T
K
Note: The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at TA = 25 C and the given supply voltage.
Data Sheet V 1.1
11
2000-11-8
TLE 6363
Circuit Description Below some important sections of the TLE 6363 are described in more detail. Power On Reset In order to avoid any system failure, a sequence of several conditions has to be passed. In case of VCC power down (VCC < VRT for t > tRR) a logic LOW signal is generated at the pin RO to reset an external microcontroller. When the level of VCC reaches the reset threshold VRT, the signal at RO remains LOW for the Power-up reset delay time tRD before switching to HIGH. If VCC drops below the reset threshold VRT for a time extending the reset reaction time tRR, the reset circuit is activated and a power down sequence of period tRD is initiated. The reset reaction time tRR avoids wrong triggering caused by short "glitches" on the VCC-line.
VCC
typ. 4.65 V 1V Start-Up RO H L Power ON Delay
< t RR
< t RD
VRT
ON Delay Started Invalid
ON Delay Stopped Invalid
t
Invalid
t RD
Start-Up Normal
t RR
Failed N Failed
t RD
Normal
t
AET02950
Figure 3
Reset Function
Data Sheet V 1.1
12
2000-11-8
TLE 6363
Watchdog Operation The watchdog uses one hundred of the oscillator's clock signal period as a timebase, defined as the watchdog cycle time tCYL. After power-on, the reset output signal at the RO pin (microcontroller reset) is kept LOW for the reset delay time tRD, i.e. 64 cycles. With the LOW to HIGH transition of the signal at RO the device starts the closed window time tCW = 32 cycles. A trigger signal within this window is interpreted as a pretrigger failure according to the figures shown below. After the closed window the open window with the duration tOW is started. The open window lasts at minimum until the trigger process has occurred, at maximum tOW is 32 cycles. A HIGH to LOW transition of the watchdog trigger signal on pin WDI is taken by a trigger. To avoid wrong triggering due to parasitic glitches two HIGH samples followed by two LOW samples (sample period tCYL) are decoded as a valid trigger. If a trigger signal appears at the watchdog input pin WDI during the open window or a power up/down occurs, the watchdog window signal is reset and a new closed window follows. A reset is generated (RO goes LOW) if there is no trigger pulse during the open window or if a pretrigger occurs during the closed window. This reset happens after 64 cycles after the latest valid closed window start time and lasts for further 64 cycles. The triggering is correct also, if the first three samples (two HIGH one LOW) of the trigger pulse at pin WDI are inside the closed window and only the fourth sample (the second LOW sample) is taken in the open window. In addition to the microcontroller reset signal RO the device generates a system enable signal at pin SEN. If RO is HIGH the system enable goes active HIGH with the first valid watchdog trigger pulse at pin WDI. The SEN output goes LOW immediately if a pretrigger, a missing trigger or a power down reset occurs.
Data Sheet V 1.1
13
2000-11-8
TLE 6363
TWD = 128 x t CYL t SR = 64 x t CYL t CW = 32 x t CYL t OW = 32 x t CYL
Definition Closed Window Open Window Reset duration time after window watchdog time-out
t WDR = 64 x t CYL
Definition Worst Case
Reset start delay time after window watchdog time-out
t ECW t CW+OWmin = ( t CW + t OW ) (1 - ) t CWmax = t CW (1 + ) t OWmin t WD *
t EOW = end of open window
Example with: t CYL = 1 ms = 10% (oscillator deviation)
f OSC = f OSCmax f OSC = f OSCmin
t OWmin results to: t OWmin = 32 ms - 0.1 x (32 ms + 64 ms) t OWmin = 22.4 ms
* recommended watchdog trigger time
AET02951
Closed window
Open window
Watchdog trigger signal
Open window
Closed window
WDI
Valid Indifferent Not valid
t ECW t EOW
AET02952
WDI
WDI
= Watchdog decoder sample point
Figure 4
Window Watchdog Definitions
Data Sheet V 1.1
14
2000-11-8
TLE 6363
a) Perfect Triggering after Power on Reset
VCC VRT
tRD = 64 Cycles
RO
t
32 Cycles WDWI CW OW CW OW CW 32 Cycles WDI xx xx SEN System Failed b) Incorrect Triggering tWDR = 64 Cycles xx xx xx xx CW
t
t
t1
t2
t3
t
System Failed
System Enable
t
tSR = 64 Cycles
RO
tSR = 64 Cycles
TWD = 128 Cycles
WDWI CW OW CW OW CW OW CW OW
t
t
WDI 32 Cycles xx
1)
x
2)
xx x x
3)
xx xx
4)
xx x xx SEN
t
1) Pretrigger 2)
t
Legend: WDWI = Internal Watchdog Window OW = Open Window (trigger signal at WDI) CW = Closed Window (trigger signal at WDI) x = Sample Point AED02945
Incorrect trigger duration within watchdog open window OW: tHIGH < 2 Cycles 3) Incorrect trigger duration within watchdog open window OW: tLOW < 2 Cycles 4) Missing trigger
Figure 5
Window Watchdog Function
15 2000-11-8
Data Sheet V 1.1
TLE 6363
Boost Converter The TLE 6363 contains a fully integrated boost converter (except the boost-diode), which provides a supply voltage for an energy reserve e.g. an airbag firing system. The regulated boost output voltage VBOOST is programmable by a divider network (external resistors) providing the feedback voltage for the boost feedback pin BOFB. The energy which is stored in the external electrolytic capacitor at VBOOST guarantees accurate airbag firing, even if the battery is disconnected by a car crash. The boost inductance LBO (typ. 100 H) is PWM-switched by an integrated current limited power DMOS transistor with a programmable (external resistor RR) frequency. An internal bandgap reference provides a temperature independent, on chip trimmed reference voltage for the regulation loop. An error amplifier compares the reference voltage with the boost feedback signal VBOFB from the external divider network (determination of the output boost voltage VBOOST). Application note for programming the output voltage at pin VBOOST:
R BO1 + R BO2 V BOOST = V BOF BTH -----------------------------------R BO2
With a PWM (Pulse Width Modulation) comparator the output of the error amplifier is compared to a periodic linear ramp, provided by a sawtooth signal of the oscillator connected to pin R. A logic signal with variable pulse width is generated. It passes through the logic circuits (sets the output latch PWM-FF) and driver circuits to the power switching DMOS. The Schmitt-trigger output resets the output flip-flop PWM-FF by NOR 2. The PWM signal is gated by the NAND 2 to guarantee a dominant reset.

Data Sheet V 1.1
16
2000-11-8
TLE 6363
OV COMP L when NAND 3 OV at VBoost & = VthOV 38 V GND UV COMP
+ + -
L when Tj > 175 C
H when Tj > 175 C or OV at VBoost Error Gate Error-FF L when H when NOR 2 R&Q Error Error 1 PWM-FF INV H= & Q OFF 1 H= ON Gate Driver & S Q OC COMP
+ -
VBoost VthUV
4V
H when VBoost < 4 V H when Overcurrent
NOR 1 1
BOI Pin 14
R
=
Power D-MOS
NAND1 & S Error AMP
+ -
GND
& Q
NAND 2 &
I Pullup
10 A BOFB Pin 12
PWM COMP
+ -
VthOC
18 mV
=
Error-Signal Error-Ramp
VREF
2.8 V
=
H when Error-Signal < Error-Ramp
14.5 m BOGND Pin 13
R Sense
GND Oscillator R Pin 1 Schmitt-trigger 1 Ramp Vhigh Unlock Detector
Vmax Vmin
OVL Boost Status Pin 11 Low if Battery Disconnected
tr tf tr
Vlow
t
tr tf tr
t
Clock GND H when Outputcurrent > 1.2 A
AEB02946
Figure 6
Boost Converter Block Diagram
Figure 7 shows the most important waveforms during operation; for low, medium and high loads up to overload condition. The output transistor is switched off immediately if the overcurrent comparator detects an overcurrent level at the power DMOS or if the sense output switches to low induced by a VBOOST undervoltage command. The TLE 6363 is also protected against several boost loop errors: In case of a feedback interruption a pull up current source (IFB typ. 0.4 A), integrated at pin BOFB pulls the voltage at the feedback pin BOFB above the reference voltage. The boost output is switched off by the high error voltage which controls the PWM-Comparator at a zero duty cycle. In the case of a resistive loop error caused by leakage currents to ground, the boost output voltage would increase to very high values. In order to protect the VBOOST input as well as the external load against catastrophic failures, an overvoltage protection is provided which switches the output transistor off as soon as the voltage at pin VBOOST exceeds the internal fixed overvoltage threshold VBOOVOFF = typ. 37 V.
Data Sheet V 1.1
17
2000-11-8
TLE 6363
Application Note: A short circuit from VBOOST to ground will not destroy the IC, however, it may damage the external boost diode or the boost inductance if there is no overcurrent limitation in that path.
and
VC
Error Voltage
VError VCP VCV
OCLK H L PWM H L
t t t
I BOI I BOLI
I DBO
t
VBOI VBOOST VS
t
t
Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp
AED02672
Figure 7
Most Important Waveforms of the Boost Converter Circuit
Data Sheet V 1.1
18
2000-11-8
TLE 6363
Buck Converter A stabilized logic supply voltage (typ. 5 V) for general purpose is realized in the system by a buck converter. An external buck-inductance LBU is PWM switched by a high side DMOS power transistor with the programmed frequency (pin R). The buck regulator supply is given by the boost converter output VBOOST, in case of a battery power-down the stored energy of the boost converter capacitor is used. Like the boost converter, the buck converter uses the temperature compensated bandgap reference voltage (typ. 2.8 V) for its regulation loop. This reference voltage is connected to the non-inverting input of the error amplifier and an internal voltage divider supplies the inverting input. Therefore the output voltage VCC is fixed due to the internal resistor ratio to typ. 5.0 V. The output of the error amplifier goes to the inverting input of the PWM comparator as well as to the buck compensation output BUC. When the error amplifier output voltage exceeds the sawtooth voltage the output power MOS-transistor is switched on. So the duration of the output transistor conduction phase depends on the VCC level. A logic signal PWM with variable pulse width is generated.
Data Sheet V 1.1
19
2000-11-8
TLE 6363
VCC
39.7
R VCC3
-
R VCC4 10.3
BUC Pin 6
=
= VthOV 1.2 V
R Prot1
200
VCC
Pin 7
L when Overcurrent Error AMP
+ -
VCC R VCC1 22 R VCC2 28
PWM H when Error- COMP Error-Signal < Signal Error-Ramp ErrorRamp
+ -
NOR 1 Output Stage OFF when H 1 R PWM-FF & H= Q OFF INV 1 H= ON Gate Driver & S Q BUO Pin 8 Power D-MOS
= VREF 2.8 V
GND GND
L when Tj > 175 C
Error-FF R & Q OFF when H
NAND 2 &
Oscillator R Pin 1
Schmitt-trigger 1
& S Q
Vmax Vmin
tr tf tr
t
Ramp
Vhigh Vlow
tr tf tr
t
Clock
AEB02947
Figure 8
Buck Converter Block Diagram
External loop compensation is required for converter stability, and is formed by connecting a compensation resistor-capacitor series-network (RBUC, CBUC) between pin BUC and GND. In the case of overload or short-circuit at VCC (the output current exceeds the buck overcurrent threshold IBUOC) the DMOS output transistor is switched off by the overcurrent comparator immediately. The pulse width is then controlled by the overcurrent comparator as seen before in the boost description. In order to protect the VCC input as well as the external load against catastrophic failures, an overvoltage protection is provided which switches the output transistor off as soon as the voltage at pin VCC exceeds the internal fixed overvoltage threshold VBUOVOFF = typ. 6.0 V.
Data Sheet V 1.1
20
+ -
GND GND
+ -
OV COMP H when OV at VCC +
UV COMP H when UV at VBoost =
VthUV
4V L when Overcurrent
VBoost
Pin 9
OC COMP
VthOC
18 mV
GND
R Sense 18 m
Boost Driver Supply
BDS Pin 10
2000-11-8
TLE 6363
and
VC
Error Voltage
VError VCP VCV
OCLK H L PWM H L
t t t
I BUO I BULI
I DBU
t
VBUO VBOOST
t
VCC5
t
Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp
AED02673
Figure 9
Most Important Waveforms of the Buck Converter Circuit
Data Sheet V 1.1
21
2000-11-8
TLE 6363
Application Circuit Figure 10 shows the application circuit of the TLE 6363 with the suggested external parts.
D1
D2
L BO
100 H
DBO
I BOLoad
VBatt
CL
10 F
ZD1 36 V
CS
220 nF
CBO1
10 nF
TLE 6363 G
BOFB 12 Boost Converter
100 k CBO1 CBO2 4700 F 220 nF 10 k
R BO1 R BO2
VBOOST
14 BOI
13 BOGND
Biasing
VBoost
CBOT
10 BDS 10 nF 9 VBOOST
VREF
BUC 6
Buck Converter
L BU
8 BUO 7 VCC 220 H DBU
47 k
R BUC CBUC
470 nF
CBU1
100 F
CBU2
220 nF
VCC
System Enable Output Watchdog Trigger Output
VInternal
5 SEN Reference Current Generator and Oscillator Reset Window Watchdog and System Enable
3 WDI
R1
2 RO
10 k
47 k 11 OVL 4 GND
RR
Reset Output Boost Status Output
Device Type D1 D2 D BO D BO D BU L BO L BO L BU L BU BAW78C BAW78C BAW78B SS14 -
Supplier Remarks Infineon 200 V; 1 A; SOT-89 Infineon 200 V; 1 A; SOT-89 Infineon 100 V; 1 A; SOT-89 multiple Schottky; 40 V; 1 A Schottky; 100 V; 1 A
B82442-A1104 EPCOS 100 H; 0.25 A; 1.28 Do3316P-104 Coilcraft 100 H; 1.2 A; 0.28 B82442-H2204 EPCOS 220 H; 0.24 A; 2.72 Do3316P-224 Coilcraft 220 H; 0.8 A; 0.61
AEB03007
Figure 10
Application Circuit
Data Sheet V 1.1
22
2000-11-8
TLE 6363
Diagrams: Oscillator and Boost/Buck-Converter Performance In the following the behaviour of the Boost/Buck-converter and the oscillator is shown. Oscillator Frequency Deviation vs. Junction Temperature
f OSC
10 kHz 5 Referred to f OSC at Tj = 25 C
AED02938
Boost Feedback Current vs. Junction Temperature
I FB
-200 nA -300
AED02939
0
-400
-5
-500
-10
-600
-15 -50 -25 0
25 50 75 100 C 150
-700 -50 -25 0
25 50 75 100 C 150
Tj
Tj
Data Sheet V 1.1
23
2000-11-8
TLE 6363
Current Consumption vs. Junction Temperature
I Boost
3 mA 2.5 Boost ON Buck ON I BO boost = 0 mA I CC = 0 mA
AED02940
Efficiency Buck vs. Boost Voltage
95
AED02941
%
90
VCC = 5 V
85
2
80
I Load = 120 mA
80 mA
1.5
75
1
70
40 mA
0.5 -50 -25 0
25 50 75 100 C 150
65
5
15
25
V 30
Tj
VBoost
Efficiency Buck vs. Load
90 % 85 RT, HT CT
AED02942
80
75
70
65
50
150
mA
250
I LOAD
Data Sheet V 1.1
24
2000-11-8
TLE 6363
Efficiency Boost vs. Input Voltage
95 % 90 HT
AED02943
Boost Output Voltage vs. Load
VBoost
31 V
AED02944
I Boost = 60 mA
30
85 RT 80
CT
29
RT HT CT
28
75
27
70
8
10
12
14
V 16
26
20
40
60
80 mA 100
VBatt
I LOAD
Oscillator Frequency vs. Resistor from R to GND
Boost and Logic Output Voltage vs. Junction Temperature
VBoost
30 V 29 28 27
AED02983
fOSC
1000 kHz 500
AED02982
I Boost = 50 mA
200 @ Tj = 25 C 100
26
VCC
50
V
5.025 5.000 4.975
I CC = 250 mA
20
10
5
10
20
50 100 200
k 1000
4.950 -50 -25 0
25 50 75 100
C 150
RR
Tj
Data Sheet V 1.1
25
2000-11-8
TLE 6363
Boost and Buck ON Resistance vs. Junction Temperature
R ON
1000 m 800
AED02984
Boost and Buck Overcurrent Threshold vs. Junction Temperature
I OC
1.4 A 1.3
AED02985
R BOON @ I BOI = 1 A
700 600 500 400
1.1 1.2
I BOOC (Boost-Converter)
R BUON @ I BUO = 1 A
300 200 100 0 -50 -25 0 25 50 75 100 C 150
1
I BUOC (Buck-Converter)
0.9 0.8 -50 -25 0
25 50 75 100
C 150
Tj
Tj
Data Sheet V 1.1
26
2000-11-8
TLE 6363
Package Outlines P-DSO-14-2 (Plastic Dual Small Outline Package)
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information" SMD = Surface Mounted Device Data Sheet V 1.1 27
Dimensions in mm 2000-11-8
GPS05474
TLE 6363
Edition 2000-11-8 Published by Infineon Technologies AG, St.-Martin-Strasse 53, D-81541 Munchen, Germany
(c) Infineon Technologies AG 2000.
All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
Data Sheet V 1.1
28
2000-11-8

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