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Features
* * * * * * * * *
Input Voltage: 8 V to 40 V Output Voltage Linear Regulator: 5 V/50 mA/3 mA ON_NOFF (High Active) Input Window Watchdog OFF Mode Quiescent current < 10 A Standby Mode Quiescent Current < 30 A Temperature Range: -40 C to 125C Reset Logic Select Pin Standby/OFF Mode
Description
The ATA6405 is a fully integrated system voltage supply IC. The device is designed for the 12/24 V board voltage system in a motor vehicle. In order to minimize power consumption, a switching regulator generates a voltage for supplying the internal linear regulator with a 5 V output voltage for microcontrollers. To monitor the microcontroller, provision has been made for a window watchdog feature incorporating a reset logic function. The voltage system IC has three modes: active, Standby and OFF. One control input serves to facilitate the selection between the active and Standby modes. Another input permits the selection between the Standby and OFF modes. In the OFF mode, a maximum quiescent current of less than 10 A flows through the system and in Standby mode quiescent current less than 30 A.
12/24 V System Power Supply IC ATA6405 Preliminary
Rev. 4737A-AUTO-06/04
Block Diagram/Application Circuit
D1 K30 (9.0 to 40.0 V) VLR (5 V) Microcontroller NTRIG 2 x 22 F + 47 nF
CVB + VB2 VB1
SCN_OUT
Window watchdog Period 11.2 ms Window 6.40 ms
VVB Monitor 7.55 V
SR0 Buck Converter 6.5 V/50 mA
LX1 LX2 LX3 L1 300 H
ResetLogic NRES
Regulator LR1 5 V (2%)/50 mA
VSR VLR 5V + CVSR
ON_NOFF TST_SCN TST_TE TCLK SCN_IN NSTB ON Standby Bandgap, Current/Bias Oscillator 400 kHz Control + CVLR 47 F + 47 nF 2 x 33 F + 47 nF
OFF
ON
Regulator Temperature Monitor 165C LR2 Standby: 5 V/3 mA
I_SET R1 20k
AGND
DGND
PGND
PGND
Mode Select
Application Notes
1. It is strongly recommended to connect the blocking capacitors at VB1, VB2, VSR, VLR as closely as possible to the pins PGND, AGND. 2. It is strongly recommended to use capacitors with very low ESR. 3. The 47 nF capacitors are of ceramic types. 4. It is strongly recommended to connect the resistor R1 as closely as possible to the pins I_SET and AGND.
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ATA6405 [Preliminary]
Pin Configuration
Figure 1. Pinning QFN28 7x7 (pitch 0.8 mm)
SCN_OUT
SCN_IN
NRES
NTRIG
TCLK
23
NC
28
27
26
25
24
DGND I_SET AGND VLR VSR PGND PGND
NC
22
1 2 3 4 5 6 7 MLP 7x7mm 0.8mm pitch ATA6405 28 lead
21 20 19 18 17 16 15
NC TST_SCN TST_TE NSTB ON_NOFF VB2 VB1
8
9
10
11
12
13
14
NC
NC
NC
LX2
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Symbol DGND I_SET AGND VLR VSR PGND PGND NC NC LX3 LX2 LX1 NC NC VB1 VB2 ON_NOFF Function Grounding connection for digital stages Connection for reference resistance Grounding connection for analog stages Output from LR1 Output from LR2 Feedback input of switching regulator and input of linear regulator LR1 Grounding connection for power stages Grounding connection for power stages Not connected Not connected Switching output of switching regulator Switching output of switching regulator Switching output of switching regulator Not connected Not connected Voltage supply Voltage supply Input for selecting between ON and OFF or Standby mode Connector to VB ON mode LOW OFF mode 5 V/50 mA (ON_mode) 5 V/3 mA (Standby mode) Remarks
LX3
LX1
NC
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Pin Description (Continued)
Pin 18 19 20 21 22 23 24 25 26 27 28 Symbol NSTB TST_TE TST_SCN NC NC TCLK SCN_IN SCN_OUT NTRIG NRES NC Function Input for selecting the OFF- or Standby mode Connections for test purposes Connections for test purposes Not connected Not connected Connections for test purposes Connections for test purposes Connections for test purposes Trigger input for watchdog Reset output Not connected Low - active, slope L/H Low - active Remarks Connector to VB OFF mode LOW Standby mode
Functional Description
The system voltage supply IC described here is designed for the 12/24V board voltage supply systems in motor vehicles. To minimize power losses, provision is made for a step-down type switching regulator to transform the battery voltage to the lowest possible initial value so as to supply the internal linear regulator with 5V. The linear regulator is equipped with monitors controlling different voltages, currents and the temperature. Accuracy of the regulators and monitors is provided by a bandgap acting in conjunction with an external reference resistance on pin I_SET. In addition to the voltage regulators, the system is further enhanced by a monitoring and control feature for microcontrollers designed in the form of a window watchdog geared to the reset logic system. A switching input is provided for switching the system on and off. Another input controlling the switched-off state serves to determine whether the system is to be completely switched off (OFF mode) or whether the Standby mode is to be enabled, in which case minimum supply of the microcontroller on pin VLR is maintained. This product is designed for continuous operation on terminal 30 of a motor vehicle board supply system. Accordingly, attention has been paid to ensuring minimum current consumption in the OFF mode. The rise in supply voltage when connected to terminal 30 or when connecting up a battery must not be allowed to fall below 2V/ms. This applies to the process of assembly and not to normal operation where minimum supply voltage is ensured even when power fades occurs during the starting phase. These operating modes can be set via the ON_NOFF and NSTB pins. Connecting pin ON_NOFF to pin VB results in the ON mode being set irrespective of the NSTB pin. If the ON_NOFF pin remains unconnected, either the OFF mode or Standby mode will be set depending on the NSTB pin. Connection of NSTB to VB results int the OFF mode being set. On the other hand, connecting the NSTB pin to ground potential will result in the Standby mode being set provided that the ON mode was previously enabled. The NSTB pin is designed for permanent wiring depending on the desired mode of functioning.
General Features
Operating Modes: ON/OFF/Standby
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Operating Sequence
Whenever a voltage having a typically greater value than 7.55 V is applied to the VB pin, the switching regulator can be run up (after a brief initialization phase of approximately 100 s) by switching from the OFF mode to the ON mode. As soon as transient build-up is just about to transpire, the LR1 linear regulator is automatically switched on, applying a typical output voltage of 5.6 V to the VSR pin. As long as transient build-up has not yet taken place on the LR1 linear regulator, a reset will be put out on the NRES pin (reset for the microcontroller supplied by the linear regulator). As soon as the typical output voltage of 4.75 V has been exceeded on the VLR pin, the reset will terminate with a delay of approximately 10 ms. This period covers the transient build-up phase on the oscillator of the microcontroller. In the event pin VLR falls below the typical limiting values, a reset will be put out. In the event of excess temperature occurring or if the supply voltage falls below the specified limiting value, both voltage regulators will be immobilized. This will also lead indirectly to the reset state, which will remain in force until pin VB voltage drops to approximately 2.5 V. The further sequence of operations after termination of the ON mode unleashed by switching to ON_NOFF will depend on the wiring of the NSTB pin (also refer to the previous description). The switching regulator and linear regulator are switched off irrespective of the NSTB pin. If the Standby mode has been selected, the first linear regulator (LR1) will be substituted by a second linear regulator of lower power capacity, this being fed directly via the VB pin. For minimized current consumption all further functions will switched off. These are the internal supply, the oscillator with the related voltage monitoring controllers, the temperature controlling monitor and the watchdog. Enabling of the Standby mode is only possible after an ON-MODE phase. Initial application of the supply voltage will prove insufficient. With the transfer from the Standby to the ON mode, activated by the switching pin ON_NOFF, the pin NRES remains high in the first time (with external resistor). Due to the functionality there is the same procedure as the one at the end of the generation of the reset output (LOW HIGH transmission at NRES). Also see section "RESET" and "Watchdog" on page 6.
Reset
The purpose of the reset function is to transform the microcontroller to be monitored into a predefined state. In order to achieve this, the NRES pin is drawn internally (or externally) on ground potential. In the OFF mode the reset signal is active permanently. After switching into the ON mode the reset signal remains for 10 ms, typically, after transient build-up of all voltage regulators. Outputting of the reset in the ON mode may be triggered due to a variety of different reasons. In case of undervoltage at pin VLR the reset occurs immediately. The turn-off delay is typically 10 ms and starts with the end of the event. The activation of the watchdog generates a reset of 10 ms. Undervoltage at pin VB or overtemperature will switch off all voltage regulators and a reset is generated due to undervoltage at pin VLR. With the changeover from the ON mode to the Standby mode the reset is locked in any time. The reset is also locked with the return to the ON mode as long as all voltage regulators have finished the transient build-up.
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Oscillator
The task of the oscillator is to provide system timing for the switching regulator as well as a timing basis for all counting and delay functions, including those of the watchdog system. It is designed in the form of an RC oscillator, the frequency of which is governed by the tolerances of integrated capacity and the properties of external resistance on pin I_SET. Temperature dependence is better than 300 ppm/C subject to corresponding selection of external resistance. To minimize interference in the radio-broadcasting band, the typical frequency has been permanently set to 400 kHz. From the variable supply voltage present on the VB pin, the SR switching regulator generates a typical output voltage of 6.5 V on the VSR pin. The latter acts as a feedback input for the switching regulator and also as an input for the LR1 linear regulator. Typical loading capacity is laid out for 50 mA. The current limitation is fixed at 100 mA. An external capacitor is needed to suppress transients and to ensure a normal input voltage for LR1. The ESR of the capacitor has to be considered due to the ripple. If the ripple is too high the voltage monitor at pin VSR will not release LR1. The operating frequency is bled off from an integrated RC oscillator, whose frequency has been set at 400 kHz. This frequency serves to ensure minimum possible interference in the radio broadcasting bands. In this context, the slope rate on the circuit output has been selected in such a way that an optimum state is achieved between the efficiency factor and freedom from interference.
Switching Regulator SR
Linear Regulators LR1, LR2
The linear regulator LR1 provides a typical supply voltage of 5.0 V on the VLR pin. The input voltage is provided on the VSR pin (output of switching regulator). An internal current limiter is set to approximately 70 mA. This regulator is only enabled in the ON mode. When changing from the ON mode to the Standby mode, linear regulator LR2 is enabled, which draws its input current directly from the VB pin, thus maintaining the typical output voltage of 5.0 V on the VLR pin up to a current of approximately 3 mA. The current limitation is fixed at 7 mA. An external capacitor needs to be added at pin VLR in accordance to the load of the microcontroller to avoid generating a reset of the voltage monitor controller.
Pin SCN OUT Watchdog
A high level in the ON mode at this pin indicates undervoltage detection at pin VB or overtemperature of the device. The watchdog anticipates a triggering signal from the microcontroller at the NTRIG input within a recurrent time window. On the basis of this low-active (or alternatively highactive) signal, evaluation of the low slope (or high slope) takes place, however only if a minimum dwell time ttrig is exceeded. If no such triggering signal is received, output of a reset will take place. Alternatively, outputting of a reset may take place if ttrig exceeds a predefined maximum value. The timing basis of the watchdog is provided by the internal RC oscillator.
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Detailed Description of the Watchdog Function Figure 2. Watchdog Sequence
tres NRES td t1 t2 t1 t2 td
NTRIG
ttrig
WD sequence (typically): t1 = 8.0 ms t2 = 6.4 ms After completion of the reset function (low/high slope on NRES) a lead time td follows (e.g. for setups) of typically 40 s before the actual watchdog sequence begins. Times t1 and t2 form a part of the watchdog sequence and assume a fixed relationship to one another. A triggering signal from the microcontroller is anticipated within the timeframe of t2 (6.4 ms). Of decisive importance in this case is the low/high slope after the minimum dwell time t trig of typically 40 s. This slope serves to restart the watchdog sequence. Should the triggering signal fail to emerge, the NRES output will be drawn on ground potential applying the time duration tres of typically 10 ms. A reset situation is likewise unleashed if the triggering signal emerges within the timeframe of t1 (8 ms) or alternatively if ttrig exceeds the time of 100 s. An example of how the above time values are defined is given in the first variant. However, the time values can, on principle, be selected by the mask function. A 6-bit counter is available for ttrig and a 16-bit counter for td, t1, t2, tres. In the same way, orientation of the trigger pulse (low- or high-active) is selectable by the mask function. The original time basis is defaulted by the internal oscillator. The time basis Twd for the watchdog is obtained by applying a division ratio of 1:4. All the times indicated above are multiples of Twd. Oscillator cycle duration: Time basis for watchdog: Tosc = 1/fosc = 1/400 kHz Tol. = 2.50 s Tol. Twd = 4 x Tosc = 10 s (typical)
The above time values and oscillator tolerances result in a typical triggering frequency based on T = 10.56 ms 0.94 ms.
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Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters Supply voltage Output voltage LX Input voltage regulator LR Output voltage regulator LR Output voltage pin NRES Output current pin I_SET Input voltage NTRIG Input voltage ON_NOFF, NSTB Junction temperature Storage temperature Symbol Vvb Vout Vin Vout Vout Iout Vin Vin Tj Tstg -0.35 -0.35 -40 -55 Min. -0.35 -1.0 -0.35 -0.35 -0.35 Max. 40 Vvb + 0.35 8 + 0.35 Vsr + 0.35 Vvlr + 0.35 1.0 Vvlr + 0.35 Vvb + 0.35 150 150 Unit V V V V V mA V V C C
Thermal Resistance
Parameters Junction to case Note:
(1)
Symbol RthJC RthJA
Value 10 130
Unit K/W K/W
Junction to ambient 1. Chip soldered on metal plate
Operating Range
Parameters Supply voltage Ambient Temperature Symbol Vvb Tamb Min. 8 -40 Max. 40 +125 Unit V C
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Electrical Characteristics
Vvb = 8 V to 40 V; Tamb = -40C to 125C; reference point is pin AGND.
No. 1 1.1 1.2 1.3 1.4 2 2.1 3 3.1 4 4.1 5 5.1 5.2 6 6.1 6.2 7 7.1 7.2 8 8.1 8.2 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 Parameters Power Supply Input current Input current Input current Dissipated power Voltage Regulator SR Output voltage Voltage Regulator LR1 Output voltage 5V Voltage Regulator LR2 Output voltage 5V Voltage Monitor VB Enable threshold voltage Hysteresis Voltage Monitor VSR Enable threshold voltage Hysteresis Voltage Monitor VLR Enable threshold voltage Hysteresis Temperature Monitor Disable threshold Hysteresis Logic High input voltage Low input voltage Input current Input current High input voltage Low input voltage Input current Input current Input current Vin = 40 V Vin = 4 V Vin = 0.4 V Vin = 5 V Vin = 0 V NTRIG NTRIG NTRIG NTRIG ON_NOFF, NSTB ON_NOFF, NSTB ON_NOFF ON_NOFF ON_NOFF Vih Vil Iin Iin Vih Vil Iin Iin Iin 197 3.1 0.5 -1.0 7.0 0.4 983 15 1 4.0 0.4 1.0 V V A A V V A A A A A A A A A A A A Tth Thy 165 15 C C C C VLR VLR Vth Vhy 4.65 4.75 0.1 4.85 V V A A VSR VSR Vth Vhy 5.48 5.6 0.1 5.72 V V A A VB VB Vth Vhy 7.4 7.55 0.1 7.7 V V A A IVLR = 0 to 3 mA VLR VLR2 4.50 5V 5.50 V A IVLR = 0 to 50 mA VLR VLR1 4.90 5V 5.10 V A IVSR = 0 to 50 mA VSR VSR 6.1 6.5 7.1 V A ON mode No load on SR, LR OFF mode Standby mode ON mode VB VB VB Ivb Ivb Ivb P 10 10 30 0.5 mA A A W A A A D Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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Electrical Characteristics (Continued)
Vvb = 8 V to 40 V; Tamb = -40C to 125C; reference point is pin AGND.
No. 9.10 9.11 9.12 9.13 9.14 9.15 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 Parameters Input current Input current Input current Low output voltage High output voltage Low output voltage Oscillator/Watchdog Oscillator period time WD time base WD pre-period WD disable time WD enable time Reset-out time Trigger pulse NTRIG LX Tosc Twd td t1 t2 tres ttrig 4 2.0 8.0 2.50 10.0 4 800 640 1000 10 3.0 12.0 s s Twd Twd Twd Twd Twd A D D A A A A Test Conditions Vin = 40 V Vin = 4 V Vin = 0.4 V Iout = -1 mA Iout = -5 mA Iout = 5 mA Pin NSTB NSTB NSTB NRES SCN_OUT SCN_OUT Symbol Iin Iin Iin Vol Voh Vol 4.6 0.4 Min. 0.5 0.5 -2 Typ. Max. 1 1 -1 0.4 Unit A A A V V V Type* A A A A A A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Noise and Surge Immunity
Parameter Conducted interferences Interference suppression ESD (Human Body Model) ESD (Machine Model) Test Conditions ISO 7637-1 VDE 0879 Part 2 MIL-STD-883D Method 3015.7 EOS/ESD - S 5.2 Value Level 4 Level 5 1.5 kV 200 V
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ATA6405 [Preliminary]
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ATA6405 [Preliminary]
Ordering Information
Extended Type Number ATA6405-PKQ Package QFN28 Remarks Voltage Regulator
Package Information
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4737A-AUTO-06/04

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