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MC33463 Variable Frequency Micropower DC-to-DC Converter
The MC33463 series are micropower step-up switching voltage regulators, specifically designed for handheld and laptop applications, to provide regulated output voltages using a minimum of external parts. A wide choice of output voltages are available. These devices feature a very low quiescent bias current of 4.0 A typical. The MC33463H-XXKT1 series features a highly accurate voltage reference, an oscillator, a variable frequency modulation (VFM) controller, a driver transistor (Lx), a comparator and feedback resistive divider. The MC33463H-XXLT1 is identical to the MC33463H-XXKT1, except that a drive pin (EXT) for an external transistor is provided. Due to the low bias current specifications, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable.
VARIABLE FREQUENCY MICROPOWER DC-to-DC CONVERTER
SEMICONDUCTOR TECHNICAL DATA
TAB 1
MC33463 Series Features:
* * * * * *
Low Quiescent Bias Current of 4.0 A High Output Voltage Accuracy of 2.5% Low Startup Voltage of 0.9 V at 1.0 mA Wide Output Voltage Range of 2.5 V to 7.5 V Available High Efficiency of 80% Typical Surface Mount Package PIN CONNECTIONS
MC33463H-XXKT1 Ground Output Lx 1 2 3 (Top View) Package (Tape/Reel) SOT-89 (Tape) (T ) TA = -30 to +80C 30 80C SOT-89 (Tape) (T ) MC33463H-XXLT1 Ground Output EXT 1 2 3 (Top View) Tab (Tab is connected to Pin 2) Tab (Tab is connected to Pin 2) H SUFFIX PLASTIC PACKAGE CASE 1213 (SOT-89)
ORDERING INFORMATION
Device MC33463H-30KT1 MC33463H-33KT1 MC33463H-50KT1 MC33463H-30LT1 MC33463H-33LT1 MC33463H-50LT1 Output Voltage 3.0 3.3 5.0 3.0 3.3 5.0 Type Int. Switch S it h Ext. Switch S it h Drive Di Operating Temperature Range
Other voltages from 2.5 V to 7.5 V, in 0.1 V increments are available. Consult factory for information.
(c) Motorola, Inc. 1999
Rev 1
MOTOROLA ANALOG IC DEVICE DATA
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MC33463
Representative Block Diagrams
MC33463H-XXKT1 D L Vin Cin Drive 3 Lx VLx Limitier 2 Output CO VO
VFM Controller
100 kHz Oscillator
Vref
1 Gnd
L Vin Cin
MC33463H-XXLT1
D 2 Rb Q 3 EXT Cb VFM Controller Drive Output CO VO
100 kHz Oscillator
Vref
1 XX Denotes Output Voltage
Gnd
This device contains 100 active transistors.
MAXIMUM RATINGS (TC = 25C, unless otherwise noted.)
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Power Supply Voltage (Transient) VCC VCC 12 V V V V Power Supply Voltage (Operating) External Pin Voltage Lx Pin Voltage 8.0 VEXT VLx -0.3 to VO 12 EXT Pin Source/Sink Current Lx Pin Sink Current IEXT ILx 50/50 250 mA mA Power Dissipation and Thermal Characteristics H Suffix, Plastic Package Case 1213 (SOT-89) Maximum Power Dissipation @ TA = 25C Thermal Resistance, Junction-to-Air Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range PD RJA TJ TA 500 200 125 mW C/W C C C -30 to +80 Tstg -40 to +125
Rating
Symbol
Value
Unit
2
MOTOROLA ANALOG IC DEVICE DATA
MC33463
ELECTRICAL CHARACTERISTICS (VCC = 2.0 V, IO = 10 mA and TA = 25C, unless otherwise noted.)
Characteristic OSCILLATOR Frequency Symbol Min Typ Max Unit
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fosc 80 - 100 0.7 75 120 0.8 85 kHz V Oscillator Minimum Supply Voltage (IO = 0 mA) Oscillator Duty Ratio Each Cycle VCC D 65 % Lx OUTPUT (KT1 SUFFIX) ON State Sink Current (VLx = 0.4 V) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix VLx Voltage Limit (Note 1) ILx mA 60 63 80 - - - - - - VLxLim ILKG 0.65 - 0.8 - 1.0 0.5 V OFF State Leakage Current (VLx = 6.0 V) A EXT OUTPUT (LT1 SUFFIX) ON State Source Current (VEXT = VO - 0.4 V) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix OFF State Sink Current (VEXT = 0.4 V) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix Isource mA 1.5 1.575 2.0 1.5 1.575 2.0 - - - - - - - - - - - - Isink mA TOTAL DEVICE Output Voltage 30KT1 or 30LT1 Suffix 33KT1 or 33LT1 Suffix 50KT1 or 50LT1 Suffix VO V 2.925 3.218 4.875 - - - - - - - - - - - - 3.0 3.3 5.0 4.0 4.3 6.0 1.2 1.2 2.0 3.075 3.383 5.125 8.0 8.6 12 5.0 5.0 5.0 50 56 90
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A
Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix IQ A 30 34.5 60 1.2 1.2 2.0 5.0 5.0 5.0
NOTE: 1. When the Lx switch is turned on, ILx carried through the RDS(on) of the Lx switch results in VLx. When VLx reaches VLxLim, the Lx switch is turned off by the Lx switch protection circuit.
Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix
IQ
A
MOTOROLA ANALOG IC DEVICE DATA
3
MC33463
Figure 1. Quiescent Current versus Temperature
50 I Q , QUIESCENT BIAS CURRENT ( A) I Q , QUIESCENT BIAS CURRENT ( A) MC33463H-30LT1 Vin = 2.0 V IO = 0 mA 2.0 MC33463H-30KT1 Vin = 3.5 V IO = 0 mA
Figure 2. Quiescent Current versus Temperature
40
1.6
30
1.2
20
0.8
10 -40
-20
0
20
40
60
80
0.4 -40
-20
0
20
40
60
80
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 3. Oscillator Frequency versus Temperature
200 fosc , OSCILLATOR FREQUENCY (kHz) MC33463H-50KT1 Vin = 2.0 V IO = 10 mA D, DUTY RATIO (%) 100
Figure 4. Oscillator Duty Ratio versus Temperature
MC33463H-50KT1 Vin = 2.0 V IO = 10 mA
160
90
120
80
80
70
40 -40
-20
0
20
40
60
80
60 -40
-20
0
20
40
60
80
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 5. Lx Switching Current versus Temperature
200 I Lx , Lx SWITCHING CURRENT (mA) VLxLim , Lx VOLTAGE LIMIT (V) 20 40 60 80 0.9
Figure 6. VLx Voltage Limit versus Temperature
160
0.8
120
0.7
80 MC33463H-50KT1 Vin = 2.0 V IO = 10 mA 40 -20 0 -40
0.6 MC33463H-50KT1 Vin = 2.0 V IO = 10 mA 0.5 -40 -20 0
20
40
60
80
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
4
MOTOROLA ANALOG IC DEVICE DATA
MC33463
Figure 7. Output Voltage versus Output Current
6.0 Vin = 4.0 V VO , OUTPUT VOLTAGE (V) VO , OUTPUT VOLTAGE (V) 5.0 4.0 3.0 Vin = 0.9 V 2.0 1.0 MC33463H-50KT1 L = 120 H TA = 25C 0 20 40 60 80 100 120 IO, OUTPUT CURRENT (mA) Vin = 1.5 V Vin = 2.0 V 5.0 4.0 V = 0.9 V in 3.0 2.0 MC33463H-50LT1 L = 28 H TA = 25C 1.0 0 100 200 Vin = 1.5 V Vin = 2.0 V Vin = 3.0 V 6.0
Figure 8. Output Voltage versus Output Current
Vin = 3.0 V
300
400
500
600
IO, OUTPUT CURRENT (mA)
Figure 9. Efficiency versus Output Current
100 80 EFFICIENCY (%) Vin = 2.0 V 60 Vin = 0.9 V 40 20 0 MC33463H-33KT1 L = 82 H TA = 25C Figure 15 0 20 40 60 80 100 120 Vin = 3.0 V EFFICIENCY (%) 100 80 60
Figure 10. Efficiency versus Output Current
Vin = 3.0 V Vin = 0.9 V Vin = 2.0 V
40 20 0 MC33463H-33LT1 L = 28 H TA = 25C Figure 16 0 100 200 300 400 500 600
IO, OUTPUT CURRENT (mA)
IO, OUTPUT CURRENT (mA)
Vstart /V hold , STARTUP/HOLD VOLTAGE LIMIT (V)
Figure 11. Startup/Hold Voltage versus Output Current
1.6 Vstart /V hold , VOLTAGE LIMIT (V) 2.0
Figure 12. Startup/Hold Voltage versus Output Current
1.2 Vstart
1.5
Vstart
0.8
1.0
Vhold
0.4
0.5 MC33463H-50LT1 L = 28 H TA = 25C 80 100 120
Vhold
0
MC33463H-50KT1 L = 82 H TA = 25C 4.0 6.0 8.0 10 12 IO, OUTPUT CURRENT (mA)
0
2.0
0
0
20
40
60
IO, OUTPUT CURRENT (mA)
MOTOROLA ANALOG IC DEVICE DATA
5
MC33463
Figure 13. Output Voltage versus Temperature
5.1 VO , OUTPUT VOLTAGE (V) Vstart/V hold , STARTUP/HOLD VOLTAGE (V) 1.0
Figure 14. Startup/Hold Voltage versus Temperature
0.8
5.0
Vstart
0.6 Vhold 0.4 MC33463H-50KT1 L = 120 H IO = 1.0 mA -20 0 20 40 60 80 TA, AMBIENT TEMPERATURE (C)
4.9
4.8 -40
-20
0
20
MC33463H-50KT1 L = 120 H 40 60 80
0.2 -40
TA, AMBIENT TEMPERATURE (C)
DEFINITIONS
Quiescent Bias Current - Current which is used to operate the switching regulator chip and is not delivered to the load. Leakage Current - Current drawn through a transistor junction, under a specified collector voltage, when the transistor is off.
components, as shown in Figure 17, or a micropower undervoltage sensor, as shown in Figure 18. Oscillator The oscillator frequency, is internally programmed to 100 kHz. The duty ratio of the oscillator is designed for a constant value of 0.75 nominal. Hence the nominal on-time of the power switch is: 0.75 D ton s f osc (100 kHz)
FUNCTIONAL DESCRIPTION
Introduction The MC33463 series are monolithic power switching regulators optimized for dc-to-dc converter applications where power drain must be minimized. The combination of features in this series allows the system designer to directly implement step-up, step-down or flyback converters with a small number of external components. Potential applications include low power consumer products and battery powered portable products. Typical application circuits are shown in Figure 15 and Figure 16. Operating Description The MC33463 series converters each operate as a fixed on-time, variable off-time voltage mode ripple regulator. Operation is intended to be in the discontinuous mode, where the inductor current ramps up to a peak value which is greater than or equal to twice the value of the dc input current during the on-time of the transistor switch. During the off-time of the transistor switch, the inductor current ramps down to zero and remains at zero until another switching cycle begins. Because the output voltage pin is also used as the supply voltage for powering internal circuitry, an external startup circuit is needed in step-down and flyback converter designs to provide initial power to the integrated circuit to begin switching. The startup circuit needed can be three discrete
+
+
+7.5
Feedback Comparator The output voltage is sensed and fed to a high speed comparator noninverting input through an internal resistive divider. The comparator inverting input is connected to an internally trimmed to 0.7 V reference. With a voltage mode ripple converter operating under normal conditions, output switch conduction is initiated and terminated by the oscillator, off-time is controlled by the high speed voltage feedback comparator. Driver and Output Switch To aid in system design flexibility and conversion efficiency, two output driver options are provided. The MC33463H-XXKT1 converters have an internal drive transistor which is capable of sinking currents greater than 60 mA into the Lx pin. An internal VLx limiter circuit senses if the Lx pin voltage exceeds 1.0 V during ton and turns off the drive transistor. The MC33463H-XXLT1 provides output drive for an external transistor. Applications The following converter applications show the simplicity and flexibility of the converter architecture. Three main converter topologies are demonstrated in Figures 15 through 19.
6
MOTOROLA ANALOG IC DEVICE DATA
MC33463
Figure 15. MC33463H-50KT1 Typical Step-Up Application
MBRD520LT1 82 H Vin
MC33463H-XXKT1 2 3 Lx VO 22 F Gnd 1
VO
Figure 16. MC33463H-50LT1 Typical Step-Up Application
MBRD520LT1 28 H Vin MC33463H-XXLT1 2 VO 300 MMBT2222ALT1 3 EXT Gnd 0.01 F 1
VO 100 F
MOTOROLA ANALOG IC DEVICE DATA
7
MC33463
Figure 17. MC33463H-33KT1 Step-Down Application
Startup Circuit MMBT2222ALT1 1.5 k BZX84C3V3LT1 3.3 V
47 H Vin 1.0 k 100 F 100 3 Lx Drive MC33463H-33KT1 VLx Limiter 2 Output 100 F MMBT2907ALT1 MBRD0520LT1 VO 3.3 V
VFM Controller
100 kHz Oscillator
Vref
1
Gnd
Test Line Regulation Load Regulation Output Ripple Efficiency
Conditions Vin = 5.0 V to 8.0 V, IO = 100 mA Vin = 5.0 V, IO = 1.0 mA to 100 mA Vin = 5.0 V, IO = 100 mA Vin = 5.0 V, IO = 100 mA
Results 18.5 mV = 0.3% 5.7 mV = 0.1% 40 mVpp 60.3%
8
MOTOROLA ANALOG IC DEVICE DATA
MC33463
Figure 18. Micropower Step-Down Application
Startup Circuit MC33464N-30ATR 2 In Out Gnd 3 1 10 k 10 k MMBT2907ALT1
47 H Vin 1.0 k 100 F 100 3 Lx MC33463H-33KT1 VLx Limiter 2 Output Drive 100 F MMBT2907ALT1 MBRD0520LT1 VO 3.3 V
VFM Controller
100 kHz Oscillator
Vref
1
Gnd
MOTOROLA ANALOG IC DEVICE DATA
9
MC33463
Figure 19. Flyback Application
MMBT2222ALT1
1.5 k Startup Circuit 3.3 V
Vin
MMBT2907ALT1 1.0 k 100 F 100 3 Lx Drive MC33463H-33KT1 VLx Limiter 2 Output
VO
100 F
VFM Controller
100 kHz Oscillator
Vref
1
Gnd
10
MOTOROLA ANALOG IC DEVICE DATA
MC33463
Figure 20. Design Equations
Calculation ton L Step-Down Step-Up Flyback
D f osc
D f osc
D f osc
2
t ton
(V in
(V
in
* Vsat * VO)
(2I ) O IO L
t (n)(Vin) (ton) P
O (V in
t (n)(Vin) (ton) P
2 O (V in
IL(avg) IL(pk) Vripple(pp)
* Vsat * VO)(ton)
2
* Vsat)(ton)
L
Iin
* Vsat)(ton)
L
Iin
DIL
1 16f oscC O
) (ESR)2
1 2
[ (ton)(I)O) (C
O
[ (ton)(I)O) (C
O
The following converter design characteristics must be chosen: Vin - Nominal Operating dc input voltage VO - Desired dc output voltage IO - Desired dc output current Vripple(pp) - Desired peak-to-peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications. NOTE: 1. Vsat - Saturation voltage of the switching transistor. n - Estimated circuit efficiency.
MOTOROLA ANALOG IC DEVICE DATA
11
MC33463
OUTLINE DIMENSIONS
H SUFFIX PLASTIC PACKAGE CASE 1213-01 (SOT-89) ISSUE O
A
D D1 B
A2 C
NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCING PER ASME Y14.5M, 1994. 3. DATUM C IS A SEATING PLANE. MILLIMETERS MIN MAX 1.40 1.60 0.37 0.57 0.32 0.52 0.30 0.50 4.40 4.60 1.50 1.70 --- 4.25 2.40 2.60 1.50 BSC 3.00 BSC 0.80 ---
E L1 B
E1
0.10 B1 e e1
2X
M
CB
S
A
S
C
0.10
M
CB
S
A
S
DIM A2 B B1 C D D1 E E1 e e1 L1
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 2, Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. - http://sps.motorola.com/mfax/ 852-26629298 HOME PAGE: http://motorola.com/sps/ JAPAN: Motorola Japan Ltd.; SPD, Strategic Planning Office, 141, 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan. 81-3-5487-8488
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MC33463/D MOTOROLA ANALOG IC DEVICE DATA

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