Freescale Semiconductor, Inc. MOTOROLA Document order number: MC33997/D Rev 3.0, 03/2003 SEMICONDUCTOR TECHNICAL DATA Advance Information 33997 Freescale Semiconductor, Inc... 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. POWER SUPPLY INTEGRATED CIRCUIT 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 DW SUFFIX 24-LEAD SOICW CASE 751E ORDERING INFORMATION Device Temperature Range (TA) Package MC33997DW/R2 -40°C to 125°C 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. © Motorola, Inc. 2003 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. 339 97 V PW R V SW 5.0 V Drive I -lim Ramp S oft Start FBKB Logic & Latch Enb V SUM O sc V bg KA_V PW R Freescale Semiconductor, Inc... V DDH Retry VREF1 B andgap Voltage S nsenb Reference Vbg 3.3V Lin ear Re gulat or Driver Enb Reg. 5.0 V FBL 3.3 V V KAM 3.3 V V RE F1 Enb POR Retry Snsenb VREF2 Reg. 5.0 V DRVL En able Co ntrol V bg 3.3V S ta ndb y Reg. Sn senb PWROK E nb V RE F2 VKAMOK PwrOK Charge Pump CRES SNSEN EN VkamOK GND Figure 1. 33997 Simplified Block Diagram 33997 2 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... VKAMOK KA_VPWR CRES VPWR GND GND GND GND VSW PWROK FBKB VSUM 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 16 10 15 11 14 12 13 VKAM EN SNSEN VREF1 GND GND GND GND VREF2 VDDH FBL DRVL PIN FUNCTION DESCRIPTION Pin Pin Name Description 1 VKAMOK 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. 2 KA_VPWR Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections and ignition switch activated connections. 3 CRES Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump. 4 VPWR 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. 5–8 GND Ground of the integrated circuit. 9 VSW 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. 10 PWROK 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. 11 FBKB Step-Down Switching Regulator Feedback Pin. The FBKB pin is the VDDH feedback signal for the switching regulator. 12 VSUM 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. 13 DRVL 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. 14 FBL 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. 15 VDDH 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. 16 VREF2 Sensor Supply #2 Output. The VREF2 pin is sensor supply output #2. 17–20 GND 21 VREF1 Ground of the integrated circuit. Sensor Supply #1 Output. The VREF1 pin is sensor supply output #1. MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com 33997 3 Freescale Semiconductor, Inc. PIN FUNCTION DESCRIPTION (continued) Pin Name 22 SNSEN 23 EN 24 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. Freescale Semiconductor, Inc... Pin 33997 4 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. MAXIMUM RATINGS All voltages are with respect to ground unless otherwise noted. Rating Symbol Value Unit VPWR -0.3 to 45 V KA_VPWR -0.3 to 45 V Switching Node VSW -0.5 to 45 V 5.0 V Input Power VDDH -0.3 to 6.0 V Sensor Supply VREF1 -0.3 to 18 V VREF2 -0.3 to 18 VKAM -0.3 to 6.0 V EN -0.3 to 6.0 V Main Supply Voltage Keep-Alive Supply Voltage Freescale Semiconductor, Inc... Keep-Alive Supply Voltage Maximum Voltage at Logic I/O Pins SNSEN -0.3 to 6.0 PWROK -0.3 to 6.0 VKAMOK -0.3 to 6.0 Charge Pump Reservoir Capacitor Voltage CRES -0.3 to 18 V Error Amplifier Summing Node VSUM -0.3 to 6.0 V Switching Regulator Output Feedback FBKB -0.3 to 6.0 V VDDL Base Drive DRVL -0.3 to 6.0 V VDDL Feedback FBL -0.3 to 6.0 V Human Body Model (all pins) (Note 1) VESD1 ±500 Machine Model (all pins) (Note 2) VESD2 ±100 Power Dissipation (TA = 25°C) (Note 3) PD 800 mW Thermal Resistance, Junction to Ambient (Note 4), (Note 5) RθJ-A 60 °C/W Thermal Resistance, Junction to Board (Note 6) RθJ-B 20 °C/W Operational Package Temperature [Ambient Temperature] (Note 7) TA -40 to 125 °C Operational Junction Temperature TJ -40 to 150 °C TSTG -55 to 150 °C TS 260 °C V ESD Voltage Storage Temperature Lead Soldering Temperature (Note 8) Notes 1. ESD1 testing is performed in accordance with the Human Body Model (CZAP =100 pF, RZAP =1500 Ω). 2. ESD2 testing is performed in accordance with the Machine Model (CZAP =200 pF, RZAP =0 Ω) 3. 4. 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. 5. 6. 7. 8. MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com 33997 5 Freescale Semiconductor, Inc. STATIC ELECTRICAL CHARACTERISTICS Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted. Characteristic Symbol Min Typ Max Normal Operating Voltage Range (Note 9) VPWR(N) 6.0 – 18 Extended Operating Voltage Range (Note 9) VPWR(E) 18 – 26.5 Maximum Transient Voltage - Load Dump (Note 10) VPWR(LD) – – 40 Unit GENERAL V Supply Voltage Range IVPWR Freescale Semiconductor, Inc... VPWR Supply Current EN = 5.0 V, VPWR = 14 V, No Loads mA 25 – 150 5.0 – 15 0.5 – 3.0 µA IQ_VPWR VPWR Quiescent Supply Current EN = 0 V, VPWR = 12 V IKAVPWR KA_VPWR Supply Current, EN = 5.0 V, KA_VPWR = 14 V, No Load on VKAM mA µA IQ_KAVPWR KA_VPWR Quiescent Supply Current EN = 0 V, KA_VPWR = 12 V V 50 – 350 4.9 – 5.1 4.9 – 5.1 -20 – 30 -20 – 20 -20 – 20 1.0 – 15 BUCK REGULATOR VDDH VDDH Buck Converter Output Voltage IVDDH = 200 mA to 1.4 A, VPWR = KA_VPWR = 14 V V VDDH Buck Converter Output Voltage IVDDH = 1.4 A, VPWR = KA_VPWR = 6.0 V V RegLnVDDH VDDH Line Regulation VPWR = KA_VPWR = 10 V to 14 V, IVDDH = 200 mA mV mV VDDH Load Regulation VPWR = KA_VPWR = 14 V, IVDDH = 200 mA to 1.4 A RegLdVDDH VPWR = KA_VPWR = 6.0 V, IVDDH = 200 mA to 1.4 A Ω RHDisch VDDH Active Discharge Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 10 mA P-CHANNEL MOSFET Drain-Source Breakdown Voltage—Not Tested (Note 11) BVDSS 45 – – V Drain-Source Current Limit—Not Tested (Note 11) IscSW1 – -7.0 – 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. 33997 6 Part can survive, but no parameters are guaranteed. Guaranteed by design but not production tested. MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. STATIC ELECTRICAL CHARACTERISTICS (continued) Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted. Characteristic Symbol Min Typ Max 3.15 – 3.45 Unit LINEAR REGULATOR VDDL VDDL VDDL Output Voltage VPWR = KA_VPWR = 14 V, IVDDL = 200 mA RegLnVDDL VDDL Line Regulation mV -70 – 70 -70 – 70 5.0 11 25 1.0 – 10 0.6 – 10 CVDDL – 68 – µF ESRVDDL – 0.125 – Ω 3.0 – 3.6 VPWR = KA_VPWR = 26 V, IVKAM = 0.5 mA 3.0 – 3.6 VPWR = KA_VPWR = 18 V, IVKAM = 5.0 mA 3.0 – 3.6 VPWR = KA_VPWR = 5.0 V, IVKAM = 10.0 mA 3.0 – 3.6 VPWR = 0 V, KA_VPWR = 3.5 V, IVKAM = 5.0 mA 2.0 – 3.5 -20 – 20 0 – 100 -20 – 20 CVKAM – 4.7 – µF ESRVKAM – 1.4 – Ω VDDH = 4.8 V to 5.2 V, IVDDL = 400 mA Freescale Semiconductor, Inc... V RegLdVDDL VDDL Load Regulation VPWR = KA_VPWR = 14 V, IVDDL = 10 mA to 400 mA mV IDRVL DRVL Output Current VPWR = KA_VPWR = 14 V, VDRVL = 1.0 V mA Ω RLDisch VDDL Active Discharge Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IFBL = 10 mA Ω RCLAMP 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 VKAM Output Voltage IVKAM = 5.0 mA, VPWR = KA_VPWR = 18 V, EN = 5.0 V VKAM Output Voltage, EN = 0 V (Standby Mode) VKAM Line Regulation, EN = 0 V (Standby Mode) VKAM V RegLnVKAM VPWR = KA_VPWR = 5.0 V to 18 V, IVKAM = 2.0 mA VKAM Load Regulation, EN = 0 V (Standby Mode) V mV RegLdVKAM VPWR = KA_VPWR = 14 V, IVKAM = 1.0 mA to 10 mA mV RegVKAM 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) mV Notes 12. Recommended value. MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com 33997 7 Freescale Semiconductor, Inc. STATIC ELECTRICAL CHARACTERISTICS (continued) Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted. Characteristic Symbol Min Typ Max – – 280 – – 350 – – 455 500 – 900 500 – 900 33 – 39 2.6 – 3.1 4.5 – 4.8 Unit SENSOR SUPPLIES VREF1, VREF2 RDS(on) VREF On-Resistance, TA = -40°C IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V RDS(on) VREF On-Resistance, TA = +25°C IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V mΩ RDS(on) VREF On-Resistance, TA = +125°C Freescale Semiconductor, Inc... mΩ IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V mΩ ISC_Bat VREF Short-to-Battery Detect Current VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V mA ISC_Gnd 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) CVREF mA nF SUPERVISORY CIRCUITS PWROK Undervoltage Threshold on VDDL, FBL Ramps Down VFBL(thL) VPWR = KA_VPWR = 14 V, IVDDH = 200 mA V VDDH(thL) PWROK Undervoltage Threshold on VDDH VPWR = KA_VPWR = 14 V, IVDDH = 200 mA V VDDH(thH) VDDH Overvoltage Threshold VPWR = KA_VPWR = 10 V, IVDDH = 200 mA V 5.12 – 5.7 – – 200 0.9 – 1.9 Ω RDS(on) PWROK Open Drain On-Resistance VPWR = KA_VPWR = 14 V, EN = 5 V, IPwrOK = 5.0 mA VKAM(thL) VKAMOK Threshold, VPWR = KA_VPWR = 14 V, IVDDH = 200 mA VKAMOK Threshold on VPWR, VPWR Ramps Up V VPWRok(th) KA_VPWR = 14 V, IVDDH = 200 mA V 4.0 – 5.0 50 – 200 Ω RDS(on) VKAMOK Open Drain On-Resistance VPWR = KA_VPWR = 14 V, EN = 0 V, IVKAMOK = 10 mA Enable Input Voltage Threshold (Pin EN) VIH 1.0 – 2.0 V Enable Pull-Down Current (Pin EN), EN = 1.0 V VDDH to VIL(min) IPD 500 – 1200 nA Sensor Enable Input Voltage Threshold (Pin SNSEN) VIH 1.0 – 2.0 V Sensor Enable Pull-Down Current (Pin SNSEN) IPD 500 – 1200 SNSEN = 1.0 V VDDH to VIL(min) nA Notes 13. Recommended value. 33997 8 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. STATIC ELECTRICAL CHARACTERISTICS (continued) Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted. Characteristic Symbol Min Typ Max VPWR = KA_VPWR = 14 V, IVDDH = 200 mA, ICP = 0 µA 12 – 15 VPWR = KA_VPWR = 14 V, IVDDH = 200 mA, ICP = 10 µA 12 – 15 Unit CHARGE PUMP CRES VCRES V Freescale Semiconductor, Inc... Charge Pump Voltage MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com 33997 9 Freescale Semiconductor, Inc. DYNAMIC ELECTRICAL CHARACTERISTICS Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C using the typical application circuit (see Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted. Characteristic Symbol Min Typ Max Unit Switching Frequency (Note 14) fSW – 750 – kHz Soft Start Duration (see Figure 2) tSS 5.0 – 15 1.0 – 20 BUCK REGULATOR VDDH VPWR = KA_VPWR = 6.0 V ms Freescale Semiconductor, Inc... CHARGE PUMP CRES tCRES Charge Pump Current Ramp-Up Time VPWR = KA_VPWR = 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V ms tCRES Charge Pump Ramp-Up Time ms 1.0 VPWR = KA_VPWR = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V – 10 SENSOR SUPPLIES VREF1, VREF2 VREF Overcurrent Detection Time (see Figure 3) µs tDet VREF Load RL = 5.0 Ω to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V, EN = 5.0 V, SNSEN = 5.0 V 0.5 – 2.0 tRet VREF Retry Timer Delay (see Figure 3) VREF Load RL = 5.0 Ω to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V, EN = 5.0 V, SNSEN = 5.0 V ms 5.0 – 20 SUPERVISORY CIRCUITS PWROK Delay Time (Power-On Reset) (see Figure 4) tD(PWROK) 5.0 – 15 ms VKAMOK Delay Time (see Figure 5) tD(VKAMOK) 10 – 30 ms VDDH Power-Up Delay Time (see Figure 6) tD(VPWR) 1.0 – 10 ms Fault-Off Timer Delay Time (see Figure 7) tFault 1.0 – 10 ms Notes 14. Guaranteed by design but not production tested. 33997 10 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. VPWR (V) KA_VPW R (V) Timing Diagrams EN (V) 6.0 0 5.0 0 2.5V 5.0 4.8V 0 TIME Figure 2. Soft-Start Time V REF (V) VPWR SNSEN KA_VPWR EN (V) (V) 14 0 5.0 t Det 0 5.0 4.0V ??V 2.0V 2.0V 0 PWROK (V) t Ret 3.3 0 TIME VDDH (V) EN (V) V PWR (V) KA_V PWR (V) Figure 3. VREF Retry Timer 14 0 5.0 0 5.0 4.6V tD(PWROK) 0 PWROK (V) Freescale Semiconductor, Inc... VDDH (V) t SS 3.3 0 TIME Figure 4. PWROK Delay Timer (Power-On Reset) MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com 33997 11 Freescale Semiconductor, Inc. (V) 6.0 EN (V) KA_V PWR Timing Diagrams (continued) 5.0 VKAM (V) 0 3.3 1.25V tD(VKAMOK) 0 VKAMOK (V) Freescale Semiconductor, Inc... VPWR = 0V 0 3.3 0 TIME 18 EN (V) 5.0 VPWR (V) 0 18 VDDH (V) KA_VPW R (V) Figure 5. VKAMOK Delay Time 5.0 0 t D(VPWR) 0 2.0V 0 TIME (V) 14 0 5.0 0 (V) VDDH (V) V DDL EN (V) V PWR KA_V PW R Figure 6. VDDH Power-Up Delay Time 3.3 0 5.0 4.8V 4.8V 1.0V 1.0V 0 tFault PW ROK (V) tFault 3.3 0 TIME Figure 7. Fault-Off Timer Delay Time 33997 12 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. 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 Freescale Semiconductor, Inc... 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. 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 VKAM Keep-Alive Operation (Standby, Power-Down Mode) 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. 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 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 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). For More Information On This Product, Go to: www.freescale.com 33997 13 Freescale Semiconductor, Inc. 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 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. Freescale Semiconductor, Inc... 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). 33997 14 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. APPLICATIONS 3 399 7 Lf1 10uH C1 Cf 2 1.0uF 100uF Cf1 10 uF V PW R 4 C2 1.0uF 9 I-lim Ramp Soft St art Dp1 11 V SUM 12 O sc Freescale Semiconductor, Inc... Rc1 3.6k VDDH 2 Dp2 Cc1 2. 2nF Vb g KA _V PWR C4 100nF FBKB Logic & Latch Enb R3 C3 2 .2 R 68uF C8 390 pF O pt io nal Snubber D1 Drive VDDH = 5.0V @ 1400mA total L1 15uH VS W 15 Retry V REF1 Ba ndgap Voltage Sn senb Referen ce Vb g 3. 3V Linear Regulat or Driver Enb Re g. DRVL 14 VREF1 Cs1 33 nF 21 E nb Retry P OR Snse nb V REF2 Re g. Enable Control V bg 3.3V Standby Reg. C6 68uF V KAM = 3.3V VKA M @ 10mA 24 C7 4 .7 uF R1 10k R2 10k 10 VKAMOK P wrO K SNSEN 22 @ 40 0mA C5 1 00n F PW ROK En b Ch arge Pump C RES 3 V DDL = 3. 3V Sns enb VREF2 16 Cs2 33nF Q1 13 FB L 1 VkamO K EN 23 5-8 17-20 G ND C9 22nF 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 Value/Rating Description/Part No. Manufacturer (Note 16) Cf1 10 µF/50 V Aluminum Electrolytic/UUB1H100MNR Nichicon Cf2, C2 1.0 µF/50 V Ceramic X7R/C1812C105K5RACTR Kemet C1 100 µF/50 V Aluminum Electrolytic/UUH1V101MNR Nichicon C3 (Note 15) 68 µF/10 V Tantalum/T494D686M010AS Kemet C6 68 µF/10 V Tantalum/T494D686M010AS Kemet C7 4.7 µF/10 V Tantalum/T494A475M010AS Kemet C4, C5 100 nF/16 V Ceramic X7R Any Manufacturer C8 (Optional) 390 pF/50 V Ceramic X7R Any Manufacturer C9 22 nF/25 V Ceramic X7R Any Manufacturer Notes 15. It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 µF/6.3 V X7R ceramic. In this case the compensation resistor has to be changed to Rc1 = 200 Ω 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 For More Information On This Product, Go to: www.freescale.com 33997 15 Freescale Semiconductor, Inc. Designator Value/Rating Description/Part No. (Note 16) 17) Manufacturer (Note Cs1, Cs2 33 nF/25 V Ceramic X7R Any Manufacturer Cc1 2.2 nF/16 V Ceramic X7R Any Manufacturer R1, R2 10 kΩ Resistor 0805, 5% Any Manufacturer R3 (Optional) 2.2 Ω Resistor 0805, 5% Any Manufacturer Rc1 3.6 kΩ Resistor 0805, 5% Any Manufacturer Lf1 10 µH Freescale Semiconductor, Inc... L1 15 µH CDRH127-100M Sumida or SLF10145-100M2R5 TDK CDRH127-150MC Sumida or SLF10145-150M2R2 TDK Q1 1.0 A/20 V Bipolar Transistor/BCP68T1 ON Semiconductor D1 2.0 A/50 V Schottky Diode/SS25 General Semiconductor Dp1 3.0 A/200 V Diode/MURS320 ON Semiconductor Dp2 27 V Transient Voltage Suppressor/SM5A27 General Semiconductor 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 INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, 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 -B- 12X P 0.010 (0.25) Freescale Semiconductor, Inc... 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. 13 1 M B M 12 24X D J 0.010 (0.25) M T A S B S F R X 45 ° C -TSEATING PLANE M 22X G K MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com DIM A B C D F G J K M P R 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 33997 17 Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... NOTES 33997 18 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... NOTES MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com 33997 19 Freescale Semiconductor, Inc... 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. 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All other product or service names are the property of their respective owners. © 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 For More Information On This Product, Go to: www.freescale.com MC33997/D