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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33997/D Rev 3.0, 03/2003
Advance Information Switching Power Supply with Linear Regulators
The 33997 is a medium-power, multi-output power supply integrated circuit that is capable of operating over a wide input voltage range, from 6.0 V up to 26.5 V with 40 V transient capability. It incorporates a sensorless current mode control step-down switching controller regulating directly to 5.0 V. The 3.3 V linear regulator uses an external pass transistor to reduce the 33997 power dissipation. The 33997 also provides a 3.3 V linear standby regulator and two 5.0 V sensor supply outputs protected by internal low-resistance LDMOS transistors. There are two separate enable pins for the main and sensor supply outputs and standard supervisory functions such as resets with power-up reset delay. The 33997 provides proper power supply sequencing for advanced microprocessor architectures such as the Motorola MPC5xx and 683xx microprocessor families. Features * Operating Voltage Range 6.0 V up to 26.5 V (40 V transient) * Step-Down Switching Regulator Output VDDH = 5.0 V @ 1400 mA (total) * Linear Regulator with External Pass Transistor VDDL = 3.3 V @ 400 mA * Low-Power Standby Linear Regulator VKAM = 3.3 V @ 10 mA * Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected Against Short-to-Battery and Short-to-Ground with Retry Capability * Undervoltage Shutdown on the VDDL, VDDH Outputs with Retry Capability * Reset Signals * Power-Up Delay * Enable Pins for Main Supplies (EN) and Sensor Supplies (SNSEN) * Power Sequencing for Advanced Microprocessor Architectures * SOIC-24WB Package
33997
POWER SUPPLY INTEGRATED CIRCUIT
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DW SUFFIX 24-LEAD SOICW CASE 751E
ORDERING INFORMATION
Device MC33997DW/R2 Temperature Range (TA) -40C to 125C Package 24 SOICW
33997 Simplified Application Diagram
This document contains certain information on a new product. Specifications and information herein are subject to change without notice. (c) Motorola, Inc. 2003
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339 97
V PW R
V SW
Drive
5.0 V
I -lim
S oft Start
Ramp
Enb
Logic & Latch
FBKB V SUM
O sc
KA_V PW R
V bg
V DDH
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Retry
VREF1 Reg.
5.0 V
B andgap Voltage S nsenb Reference
Vbg
Enb
3.3V Lin ear Re gulat or Driver
DRVL FBL
3.3 V
V RE F1
Enb
Retry
POR
Snsenb
V bg
3.3V S ta ndb y Reg.
V KAM
3.3 V
VREF2 Reg.
5.0 V
En able Co ntrol
Sn senb
E nb
PWROK VKAMOK
V RE F2
Charge Pump
PwrOK
VkamOK
CRES
SNSEN
EN
GND
Figure 1. 33997 Simplified Block Diagram
33997 2
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VKAMOK KA_VPWR CRES VPWR GND GND GND GND VSW PWROK FBKB VSUM
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
VKAM EN SNSEN VREF1 GND GND GND GND VREF2 VDDH FBL DRVL
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PIN FUNCTION DESCRIPTION
Pin 1 2 3 4 Pin Name VKAMOK KA_VPWR CRES VPWR Description Keep-Alive Output Monitoring. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to VKAM. When the supply voltage to the 33997 is disconnected or lost, the VKAMOK signal goes low. Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections and ignition switch activated connections. Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump. Power Supply Pin. Main power input to the IC. This pin is directly connected to the switching regulator power MOSFET. In automotive applications this pin must be protected against reverse battery conditions by an external diode. Ground of the integrated circuit. Internal P-Channel Power MOSFET Drain. VSW is the "switching node" of the voltage buck converter. This pin is connected to the VPWR pin by an integrated p-channel MOSFET. Power OK Reset Pin. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to VKAM, VDDH, or VDDL. When either VDDH or VDDL output voltage goes out of the regulation limits this pin is pulled down. Step-Down Switching Regulator Feedback Pin. The FBKB pin is the VDDH feedback signal for the switching regulator. Error Amplifier "Summing Node". The VSUM pin is connected to the inverting input of the error amplifier. This node is also the "common" point of the integrated feedback resistor divider. Drive for VDDL (3.3 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the VDDL linear post regulator. The collector of the VDDL pass transistor is connected to VDDH. An example of a suitable pass transistor is BCP68. Feedback for VDDL (3.3 V) Regulator. The FBL pin is the voltage feedback sense signal from the VDDL (3.3 V) linear post regulator. VDDH is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the 3.3 V linear power regulator. The VDDH pin is supplied from the switching regulator output, capable of providing 5.0 V @ 1400 mA total output current. Sensor Supply #2 Output. The VREF2 pin is sensor supply output #2. Ground of the integrated circuit. Sensor Supply #1 Output. The VREF1 pin is sensor supply output #1.
5-8 9
GND VSW PWROK
10
11 12 13
FBKB VSUM DRVL
14 15
FBL VDDH
16 17-20 21
VREF2 GND VREF1
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33997 3
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PIN FUNCTION DESCRIPTION (continued)
Pin 22 23 24 Pin Name SNSEN EN VKAM Description Sensor Supply Enable Input. The SNSEN pin is an input, which enables the VREF1 and VREF2 supplies. It allows the control module hardware/software to shut down the sensor supplies. Enable Input. The EN pin is an input, which enables the main switching regulator and all other functions. When this pin is low, the power supply is in a low quiescent state. Keep-Alive (standby) 3.3 V Regulator Output. This is a 3.3 V low quiescent, low dropout regulator for Keep Alive memory.
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33997 4
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MAXIMUM RATINGS All voltages are with respect to ground unless otherwise noted.
Rating Main Supply Voltage Keep-Alive Supply Voltage Switching Node 5.0 V Input Power Sensor Supply Symbol VPWR KA_VPWR VSW VDDH VREF1 VREF2 Keep-Alive Supply Voltage VKAM EN SNSEN PWROK VKAMOK Charge Pump Reservoir Capacitor Voltage Error Amplifier Summing Node Switching Regulator Output Feedback VDDL Base Drive VDDL Feedback ESD Voltage Human Body Model (all pins) (Note 1) Machine Model (all pins) (Note 2) Power Dissipation (TA = 25C) (Note 3) Thermal Resistance, Junction to Ambient (Note 4), (Note 5) Thermal Resistance, Junction to Board (Note 6) Operational Package Temperature [Ambient Temperature] (Note 7) Operational Junction Temperature Storage Temperature Lead Soldering Temperature (Note 8) VESD1 VESD2 PD RJ-A RJ-B TA TJ TSTG TS 500 100 800 60 20 -40 to 125 -40 to 150 -55 to 150 260 mW C/W C/W C C C C CRES VSUM FBKB DRVL FBL Value -0.3 to 45 -0.3 to 45 -0.5 to 45 -0.3 to 6.0 -0.3 to 18 -0.3 to 18 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 18 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 V V V V V V V V Unit V V V V V
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Maximum Voltage at Logic I/O Pins
Notes 1. ESD1 testing is performed in accordance with the Human Body Model (CZAP =100 pF, RZAP =1500 ). 2. 3. 4. 5. 6. 7. 8. ESD2 testing is performed in accordance with the Machine Model (CZAP =200 pF, RZAP =0 ) Maximum power dissipation at indicated junction temperature. Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board) temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal resistance. Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal. Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on the top surface of the board near the package. The limiting factor is junction temperature, taking into account the power dissipation, thermal resistance, and heat sinking. Lead soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may cause malfunction or permanent damage to the device.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33997 5
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STATIC ELECTRICAL CHARACTERISTICS Characteristics noted under conditions 9.0 V VPWR 16 V, -40C TJ = TA 125C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25C under nominal conditions unless otherwise noted.
Characteristic Symbol Min Typ Max Unit
GENERAL
Supply Voltage Range Normal Operating Voltage Range (Note 9) Extended Operating Voltage Range (Note 9) Maximum Transient Voltage - Load Dump (Note 10) VPWR Supply Current VPWR(N) VPWR(E) VPWR(LD) IVPWR 25 IQ_VPWR 5.0 IKAVPWR 0.5 IQ_KAVPWR 50 - 350 - 3.0 A - 15 mA - 150 A 6.0 18 - - - - 18 26.5 40 V mA V
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EN = 5.0 V, VPWR = 14 V, No Loads VPWR Quiescent Supply Current EN = 0 V, VPWR = 12 V KA_VPWR Supply Current, EN = 5.0 V, KA_VPWR = 14 V, No Load on VKAM KA_VPWR Quiescent Supply Current EN = 0 V, KA_VPWR = 12 V
BUCK REGULATOR VDDH
Buck Converter Output Voltage IVDDH = 200 mA to 1.4 A, VPWR = KA_VPWR = 14 V Buck Converter Output Voltage IVDDH = 1.4 A, VPWR = KA_VPWR = 6.0 V VDDH Line Regulation VPWR = KA_VPWR = 10 V to 14 V, IVDDH = 200 mA VDDH Load Regulation VPWR = KA_VPWR = 14 V, IVDDH = 200 mA to 1.4 A VPWR = KA_VPWR = 6.0 V, IVDDH = 200 mA to 1.4 A VDDH Active Discharge Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 10 mA RHDisch 1.0 - 15 RegLdVDDH -20 -20 - - 20 20 RegLnVDDH -20 - 30 mV VDDH 4.9 - 5.1 mV VDDH 4.9 - 5.1 V V
P-CHANNEL MOSFET
Drain-Source Breakdown Voltage--Not Tested (Note 11) Drain-Source Current Limit--Not Tested (Note 11) BVDSS IscSW1 45 - - -7.0 - - V A
Notes 9. VDDH is fully functional when the 33997 is operating at higher battery voltages, but these parameters are not tested. The test condition as are: a) VDDH must be between 4.9 V and 5.1 V (200 mA to 1.4 A) for VPWR = 14 V to 18 V. b) VDDH must be between 4.8 V and 5.5 V (200 mA to 1.4 A) for VPWR = 18 V to 26.5 V. 10. 11. Part can survive, but no parameters are guaranteed. Guaranteed by design but not production tested.
33997 6
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STATIC ELECTRICAL CHARACTERISTICS (continued) Characteristics noted under conditions 9.0 V VPWR 16 V, -40C TJ = TA 125C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25C under nominal conditions unless otherwise noted.
Characteristic Symbol Min Typ Max Unit
LINEAR REGULATOR VDDL
VDDL Output Voltage VPWR = KA_VPWR = 14 V, IVDDL = 200 mA VDDL Line Regulation VDDH = 4.8 V to 5.2 V, IVDDL = 400 mA RegLnVDDL -70 RegLdVDDL -70 IDRVL 5.0 RLDisch 1.0 RCLAMP 0.6 CVDDL ESRVDDL - - - 68 0.125 10 - - F - 10 11 25 - 70 mA - 70 mV VDDL 3.15 - 3.45 mV V
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VDDL Load Regulation VPWR = KA_VPWR = 14 V, IVDDL = 10 mA to 400 mA DRVL Output Current VPWR = KA_VPWR = 14 V, VDRVL = 1.0 V VDDL Active Discharge Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IFBL = 10 mA VDDH to VDDL Active Clamp Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 50 mA, VFBKB = 0 V VDDL Output Capacitor Capacitance (Note 12) VDDL Output Capacitor ESR (Note 12)
KEEP-ALIVE (STANDBY) REGULATOR VKAM
VKAM Output Voltage IVKAM = 5.0 mA, VPWR = KA_VPWR = 18 V, EN = 5.0 V VKAM Output Voltage, EN = 0 V (Standby Mode) VPWR = KA_VPWR = 26 V, IVKAM = 0.5 mA VPWR = KA_VPWR = 18 V, IVKAM = 5.0 mA VPWR = KA_VPWR = 5.0 V, IVKAM = 10.0 mA VPWR = 0 V, KA_VPWR = 3.5 V, IVKAM = 5.0 mA VKAM Line Regulation, EN = 0 V (Standby Mode) VPWR = KA_VPWR = 5.0 V to 18 V, IVKAM = 2.0 mA VKAM Load Regulation, EN = 0 V (Standby Mode) VPWR = KA_VPWR = 14 V, IVKAM = 1.0 mA to 10 mA Differential Voltage VKAM - VDDL EN = 5.0 V, IVKAM = 5.0 mA, VPWR = KA_VPWR = 14 V, IVDDL = 200 mA VKAM Output Capacitor Capacitance (Note 12) VKAM Output Capacitor ESR (Note 12) Notes 12. Recommended value. CVKAM ESRVKAM RegVKAM -20 - - - 4.7 1.4 20 - - F RegLdVKAM 0 - 100 mV RegLnVKAM -20 - 20 mV VKAM 3.0 3.0 3.0 2.0 - - - - 3.6 3.6 3.6 3.5 mV VKAM 3.0 - 3.6 V V
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STATIC ELECTRICAL CHARACTERISTICS (continued) Characteristics noted under conditions 9.0 V VPWR 16 V, -40C TJ = TA 125C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25C under nominal conditions unless otherwise noted.
Characteristic Symbol Min Typ Max Unit
SENSOR SUPPLIES VREF1, VREF2
VREF On-Resistance, TA = -40C IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V VREF On-Resistance, TA = +25C IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V VREF On-Resistance, TA = +125C RDS(on) - ISC_Bat 500 ISC_Gnd 500 CVREF 33 - - 900 39 nF - 900 mA - 455 mA RDS(on) - - 350 m RDS(on) - - 280 m m
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IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V VREF Short-to-Battery Detect Current VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V VREF Short-to-Ground Detect Current VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V Maximum Output Capacitance (Total) (Note 13)
SUPERVISORY CIRCUITS
PWROK Undervoltage Threshold on VDDL, FBL Ramps Down VPWR = KA_VPWR = 14 V, IVDDH = 200 mA PWROK Undervoltage Threshold on VDDH VPWR = KA_VPWR = 14 V, IVDDH = 200 mA VDDH Overvoltage Threshold VPWR = KA_VPWR = 10 V, IVDDH = 200 mA PWROK Open Drain On-Resistance VPWR = KA_VPWR = 14 V, EN = 5 V, IPwrOK = 5.0 mA VKAMOK Threshold, VPWR = KA_VPWR = 14 V, IVDDH = 200 mA VKAMOK Threshold on VPWR, VPWR Ramps Up KA_VPWR = 14 V, IVDDH = 200 mA VKAMOK Open Drain On-Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IVKAMOK = 10 mA Enable Input Voltage Threshold (Pin EN) Enable Pull-Down Current (Pin EN), EN = 1.0 V VDDH to VIL(min) Sensor Enable Input Voltage Threshold (Pin SNSEN) Sensor Enable Pull-Down Current (Pin SNSEN) SNSEN = 1.0 V VDDH to VIL(min) Notes 13. Recommended value. VIH IPD VIH IPD 500 - 1200 RDS(on) 50 1.0 500 1.0 - - - - 200 2.0 1200 2.0 V nA V nA VPWRok(th) 4.0 - 5.0 VKAM(thL) 0.9 - 1.9 V RDS(on) - - 200 V VDDH(thH) 5.12 - 5.7 VDDH(thL) 4.5 - 4.8 V VFBL(thL) 2.6 - 3.1 V V
33997 8
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STATIC ELECTRICAL CHARACTERISTICS (continued) Characteristics noted under conditions 9.0 V VPWR 16 V, -40C TJ = TA 125C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25C under nominal conditions unless otherwise noted.
Characteristic Symbol Min Typ Max Unit
CHARGE PUMP CRES
Charge Pump Voltage VPWR = KA_VPWR = 14 V, IVDDH = 200 mA, ICP = 0 A VPWR = KA_VPWR = 14 V, IVDDH = 200 mA, ICP = 10 A VCRES 12 12 - - 15 15 V
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33997 9
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DYNAMIC ELECTRICAL CHARACTERISTICS Characteristics noted under conditions 9.0 V VPWR 16 V, -40C TJ = TA 125C using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25C under nominal conditions unless otherwise noted.
Characteristic Symbol Min Typ Max Unit
BUCK REGULATOR VDDH
Switching Frequency (Note 14) Soft Start Duration (see Figure 2) VPWR = KA_VPWR = 6.0 V fSW tSS 5.0 - 15 - 750 - kHz ms
CHARGE PUMP CRES
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Charge Pump Current Ramp-Up Time VPWR = KA_VPWR = 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V Charge Pump Ramp-Up Time VPWR = KA_VPWR = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V
tCRES 1.0 tCRES 1.0 - 10 - 20
ms
ms
SENSOR SUPPLIES VREF1, VREF2
VREF Overcurrent Detection Time (see Figure 3) VREF Load RL = 5.0 to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V, EN = 5.0 V, SNSEN = 5.0 V VREF Retry Timer Delay (see Figure 3) VREF Load RL = 5.0 to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V, EN = 5.0 V, SNSEN = 5.0 V tRet 5.0 - 20 tDet 0.5 - 2.0 ms s
SUPERVISORY CIRCUITS
PWROK Delay Time (Power-On Reset) (see Figure 4) VKAMOK Delay Time (see Figure 5) VDDH Power-Up Delay Time (see Figure 6) Fault-Off Timer Delay Time (see Figure 7) Notes 14. Guaranteed by design but not production tested. tD(PWROK) tD(VKAMOK) tD(VPWR) tFault 5.0 10 1.0 1.0 - - - - 15 30 10 10 ms ms ms ms
33997 10
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Timing Diagrams
VPWR (V) KA_VPW R (V)
6.0
0
EN (V)
5.0 0
2.5V
t SS
VDDH (V)
5.0
4.8V
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0
TIME
Figure 2. Soft-Start Time
VPWR SNSEN KA_VPWR EN (V) (V)
14
0 5.0 0
t Det
V REF (V)
5.0
4.0V ??V
2.0V
2.0V
0
t Ret
PWROK (V)
3.3 0 TIME
Figure 3. VREF Retry Timer
V PWR (V) KA_V PWR (V)
EN (V) VDDH (V)
14
0 5.0 0
5.0
4.6V
0
PWROK (V)
tD(PWROK)
3.3 0
TIME
Figure 4. PWROK Delay Timer (Power-On Reset)
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Timing Diagrams (continued)
KA_V PWR
6.0
(V)
0
VPWR = 0V
EN (V) VKAM (V)
5.0 0
3.3 1.25V
0 tD(VKAMOK)
VKAMOK (V)
3.3
0
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TIME
Figure 5. VKAMOK Delay Time
KA_VPW R (V) EN (V) VPWR (V)
18
0
5.0 0 18 t D(VPWR)
0
5.0
VDDH (V)
2.0V 0
TIME
Figure 6. VDDH Power-Up Delay Time
KA_V PW R
V PWR
14
(V)
0 5.0 0
EN (V)
V DDL
(V)
3.3 0
4.8V
VDDH (V)
5.0
4.8V
1.0V
0
1.0V
tFault
tFault
PW ROK (V)
3.3 0
TIME
Figure 7. Fault-Off Timer Delay Time
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SYSTEM/APPLICATION INFORMATION
INTRODUCTION
The 33997 multi-output power supply integrated circuit is capable of operating from 6.0 V up to 26.5 V with 40 V transient capability. It incorporates a step-down switching controller regulating directly to 5.0 V. The 3.3 V linear regulator uses an external pass transistor, thus reducing the power dissipation of the integrated circuit. The 33997 also provides a 3.3 V linear standby regulator and two 5.0 V sensor supply outputs protected by internal low-resistance LDMOS transistors against short-to-battery and short-to-ground.
FUNCTIONAL PIN DESCRIPTION Switching Regulator VDDH
The switching regulator is a high-frequency (750 kHz), conventional buck converter with integrated high-side pchannel power MOSFET. Its output voltage is regulated to provide 5.0 V with 2% accuracy and it is intended to directly power the digital and analog circuits of the Electronic Control Module (ECM). The switching regulator output is rated for 1400 mA total output current. This current can be used by the linear regulator VDDL and sensor supplies VREF1 and VREF2. The 33997 switching controller utilizes "Sensorless Current Mode Control" to achieve good line rejection and stabilize the feedback loop. A soft-start feature is incorporated into the 33997. When the device is enabled, the switching regulator output voltage VDDH ramps up to about half of full scale and then takes 16 steps up to the nominal regulation voltage level (5.0 V nominal). above 17 V are considered "double faults" and neither one of the VREF outputs is protected against such conditions. Depending on the VDDH capacitor value and its ESR value, the severity of the short may disrupt the VDDH operation.
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Keep-Alive (Standby) Regulator VKAM
The Keep-Alive Regulator VKAM (keep-alive memory) is intended to provide power for "key off" functions such as nonvolatile SRAM, "KeyOff" timers and controls, KeySwitch monitor circuits, and perhaps a CAN/SCP monitor and wakeup function. It may also power other low-current circuits required during a "KeyOff" condition. The regulated voltage is nominally 3.3 V. A severe fault condition on the VKAM output is signaled by pulling the VKAMOK signal low.
3.3 V Linear Regulator VDDL
The 3.3 V linear post-regulator is powered from the 5.0 V switching regulator output (VDDH). A discrete pass transistor is used to the power path for the VDDL regulator. This arrangement minimizes the power dissipation off the controller IC. The FBL pin is the feedback input of the regulator control loop and the DRVL pin the external NPN pass transistor base drive. Power up, power down, and fault management are coordinated with the 5.0 V switching regulator.
VKAM Keep-Alive Operation (Standby, Power-Down Mode)
When the EN pin is pulled low, the power supply is forced into a low-current standby mode. In order to reduce current drawn by the VPWR and KA_VPWR pins, all power supply functions are disabled except for the VKAM and Enable (EN) pins. The latter pin is monitored for the "wake-up" signal. The switching transistor gate is actively disabled and the VDDL and VDDH pins are actively pulled low.
Sensor Supplies VREF1 and VREF2
The sensor supplies are implemented using a protected switch to the main 5.0 V (switching regulator) output. The 33997 integrated circuit provides two low-resistance LDMOS power MOSFETs connected to the switching regulator output (VDDH). These switches have short-to-battery and short-toground protection integrated into the IC. When a severe fault conditions is detected, the affected sensor output is turned off and the sensor Retry Timer starts to time out. After the Retry Timer expires, the sensor supply tries to power up again. Sensor supplies VREF can be disabled by pulling the Sensor Enable SNSEN pin low (see Figure 7 for the VREF Retry Timer operation). Notes: Severe fault conditions on the VREF1 and VREF2 outputs, like hard shorts to either ground or battery, may disrupt the operation of the main regulator VDDH. Shorts to battery
Power-Up Delay Timers
Two Power-Up Delay timers are integrated into the control section of the integrated circuit. One timer monitors the input voltage at the VPWR input pin (see Figure 3), and the other monitors the input voltage at the KA_VPWR input pin. In both cases, sufficient supply voltage must be present long enough for the timers to "time out" before the switching regulator can be enabled.
Fault-Off Timer
If the VDDL output voltage does not reach its valid range at the end of soft-start period, or if the VDDH or VDDL output voltage gets below its PWROK threshold level, the Fault-Off Timer shuts the switching regulator off until the timer "times out" and the switching regulator retries to power up again (see Figure 7 for Fault-Off Timer operation details).
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Power-On Reset Timer This timer starts to time out at the end of the soft-start period if the VDDH and VDDL outputs are in the valid regulation range. If the timer "times out", then the open-drain PWROK signal is released, indicating that "power is ON". Supervisory Circuits PWROK and VKAMOK The 33997 has two voltage monitoring open-drain outputs, the PWROK and the VKAMOK pins. PWROK is "active high". This output is pulled low when either of the regulator outputs
(VDDH or VDDL) are below their regulation windows. If both regulator outputs are above their respective lower thresholds, and the Power-On Reset Timer has expired, the output driver is turned off and this pin is at high-impedance state (see Figure 6). The VKAMOK signal indicates a severe fault condition on the keep-alive regulator output VKAM. The VKAM output voltage is compared to the internal bandgap reference voltage. When the VKAM falls below the bandgap reference voltage level, the VKAMOK signal is pulled low.
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33997 14
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APPLICATIONS
3 399 7 Lf1 10uH Cf1 10 uF C1 Cf 2 1.0uF 100uF V PW R 4 C2 1.0uF VS W 9 I-lim Drive D1 L1 15uH VDDH = 5.0V @ 1400mA total C4 100nF
Soft St art Dp1 KA _V PWR
Ramp Enb Logic & Latch
R3 C3 2 .2 R 68uF C8 390 pF O pt io nal Snubber
FBKB 11 V SUM 12 Vb g VDDH 15
O sc
Cc1 2. 2nF
Rc1 3.6k
Freescale Semiconductor, Inc...
Dp2
2 Retry
V REF1 Re g. VREF1 Cs1 33 nF 21 Retry
Ba ndgap Voltage Sn senb Referen ce
Vb g
Enb
3. 3V Linear Regulat or Driver
DRVL 13 FB L 14
Q1 V DDL = 3. 3V @ 40 0mA C5 1 00n F C6 68uF V KAM = 3.3V @ 10mA C7 4 .7 uF R1 10k R2 10k
E nb P OR Snse nb V REF2 Re g. Enable Control Sns enb V bg
3.3V Standby Reg.
VKA M 24
PW ROK En b 10 VKAMOK P wrO K VkamO K 1
VREF2 16 Cs2 33nF Ch arge Pump
C RES 3 C9 22nF
SNSEN 22
EN 23
5-8 17-20
G ND
Note The VDDH total output current is 1.4 A. This includes the current used by the linear regulator VDDL and buffered outputs VREF1 and VREF2.
Figure 8. 33997 Application Circuit Schematic Diagram Table 1. Recommended Components
Designator Cf1 Cf2, C2 C1 C3 (Note 15) C6 C7 C4, C5 C8 (Optional) C9 Value/Rating 10 F/50 V 1.0 F/50 V 100 F/50 V 68 F/10 V 68 F/10 V 4.7 F/10 V 100 nF/16 V 390 pF/50 V 22 nF/25 V Description/Part No. Aluminum Electrolytic/UUB1H100MNR Ceramic X7R/C1812C105K5RACTR Aluminum Electrolytic/UUH1V101MNR Tantalum/T494D686M010AS Tantalum/T494D686M010AS Tantalum/T494A475M010AS Ceramic X7R Ceramic X7R Ceramic X7R Manufacturer (Note 16) Nichicon Kemet Nichicon Kemet Kemet Kemet Any Manufacturer Any Manufacturer Any Manufacturer
Notes 15. It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 F/6.3 V X7R ceramic. In this case the compensation resistor has to be changed to Rc1 = 200 to stabilize the switching regulator operation. 16. Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or tables. While Motorola offers component recommendations in this configuration, it is the customer's responsibility to validate their application.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33997 15
Freescale Semiconductor, Inc.
Designator Cs1, Cs2 Cc1 R1, R2 R3 (Optional) Rc1 Lf1 L1 Q1
Value/Rating 33 nF/25 V 2.2 nF/16 V 10 k 2.2 3.6 k 10 H 15 H 1.0 A/20 V 2.0 A/50 V 3.0 A/200 V 27 V
Description/Part No. Ceramic X7R Ceramic X7R Resistor 0805, 5% Resistor 0805, 5% Resistor 0805, 5% CDRH127-100M or SLF10145-100M2R5 CDRH127-150MC or SLF10145-150M2R2 Bipolar Transistor/BCP68T1 Schottky Diode/SS25 Diode/MURS320 Transient Voltage Suppressor/SM5A27
(Note 17) Manufacturer (Note 16) Any Manufacturer Any Manufacturer Any Manufacturer Any Manufacturer Any Manufacturer Sumida TDK Sumida TDK ON Semiconductor General Semiconductor ON Semiconductor General Semiconductor
Freescale Semiconductor, Inc...
D1 Dp1 Dp2
Notes 17. Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or tables. While Motorola offers component recommendations in this configuration, it is the customer's responsibility to validate their application.
33997 16
MOTOROLA ANALOG For More Information On This Product,INTEGRATED CIRCUIT DEVICE DATA Go to: www.freescale.com
Freescale Semiconductor, Inc.
PACKAGE DIMENSIONS
DW SUFFIX 24-LEAD SOIC WIDE BODY PLASTIC PACKAGE CASE 751E-04 ISSUE E -A24 13 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS MIN MAX 15.25 15.54 7.40 7.60 2.35 2.65 0.35 0.49 0.41 0.90 1.27 BSC 0.23 0.32 0.13 0.29 0 8 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.601 0.612 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0 8 0.395 0.415 0.010 0.029
-B-
12X
P 0.010 (0.25)
M
B
M
Freescale Semiconductor, Inc...
1
12
24X
D 0.010 (0.25)
M
J TA
S
B
S
F R C -TSEATING PLANE X 45
M
22X
G
K
DIM A B C D F G J K M P R
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On This Product, Go to: www.freescale.com
33997 17
Freescale Semiconductor, Inc.
NOTES
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33997 18
MOTOROLA ANALOG For More Information On This Product,INTEGRATED CIRCUIT DEVICE DATA Go to: www.freescale.com
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NOTES
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On This Product, Go to: www.freescale.com
33997 19
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Freescale Semiconductor, Inc...
Information in this document is provided solely to enable system and software implementers to use Motorola products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. 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 the Stylized M Logo are registered in the US Patent and Trademark Office. All other product or service names are the property of their respective owners. (c) Motorola, Inc. 2003 HOW TO REACH US: USA/EUROPE/LOCATIONS NOT LISTED: Motorola Literature Distribution P.O. Box 5405, Denver, Colorado 80217 1-800-521-6274 or 480-768-2130 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center 3-20-1 Minami-Azabu. Minato-ku, Tokyo 106-8573, Japan 81-3-3440-3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong 852-26668334 HOME PAGE: http://motorola.com/semiconductors
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