MCZ33998EG

Freescale Semiconductor Technical Data Document Number: MC33998 Rev. 2.0, 8/2006 Switching Power Supply with Linear Regulators 33998 The 33998 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 2.6 V linear regulator uses an external pass transistor to reduce the 33998 power dissipation. The 33998 also provides a 2.6 V linear standby regulator and two 5.0 V sensor supply outputs protected by internal lowresistance 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 33998 provides proper power supply sequencing for advanced microprocessor architectures such as the MPC5xx and 683xx microprocessor families. SWITCHING REGULATOR DW SUFFIX EG SUFFIX (PB-FREE) 98ASB42344B 24-PIN SOICW ORDERING INFORMATION Features • Operating Voltage Range 6.0 V up to 26.5 V (40 V transient) Temperature Device Package Range (TA) • Step-Down Switching Regulator Output VDDH = 5.0 V @ 1400 mA (total) MC33998DW/R2 • Linear Regulator with External Pass Transistor VDDL = 2.6 V @ -40°C to 125°C 24 SOICW MCZ33998EG/R2 400 mA • Low-Power Standby Linear Regulator VKAM = 2.6 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 • Pb-Free Packaging Designated by Suffix Code EG 33998 KA_VPWR VSW VDDH 5.0 V VPWR VDDH 5.0 V VREF1 5.0 V VREF2 MCU DRVL FBL VKAM VDDL VKAM EN SNSEN GND PWROK VKAMOK Figure 1. 33998 Simplified Application Diagram Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as may be required, to permit improvements in the design of its products. © Freescale Semiconductor, Inc., 2007. All rights reserved. 2.6 V 2.6 V INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM 33998 VPWR VSW Drive I-lim Sof t Start 5.0 V Ramp FBKB Logic & Latch Enb VSUM Osc V bg KA_VPWR VDDH Retry VREF1 Reg. 5.0 V Bandgap Voltage Reference Snsenb Vbg 2.6V Linear Regulator Driver Enb FBL 2.6 V VKAM 2.6 V VREF1 Enb Retry POR Snsenb VREF2 Reg. 5.0 V DRVL 2.6V Standby Reg. V bg Snsenb Enable Control Enb PWRO K VREF2 VKAMOK PwrOK Charge Pump CRES SNSEN VkamOK EN PGND Figure 2. 33998 Simplified Internal Block Diagram 33998 2 Analog Integrated Circuit Device Data Freescale Semiconductor PIN CONNECTIONS PIN CONNECTIONS 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 Figure 3. 33998 Pin Connections Table 1. Pin Definitions Pin Number Pin Name 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 33998 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 (2.6 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 (2.6 V) Regulator. The FBL pin is the voltage feedback sense signal from the VDDL (2.6 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 2.6 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 Definition Ground of the integrated circuit. Sensor Supply #1 Output. The VREF1 pin is sensor supply output #1. 33998 3 Analog Integrated Circuit Device Data Freescale Semiconductor PIN CONNECTIONS Table 1. Pin Definitions (continued) Pin Number Pin Name Definition 22 SNSEN 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. 23 EN 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. 24 VKAM Keep-Alive (standby) 2.6 V Regulator Output. This is a 2.6 V low quiescent, low dropout regulator for Keep Alive memory. 33998 4 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS Table 2. 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 V Main Supply Voltage Keep-Alive Supply Voltage Keep-Alive Supply Voltage Maximum Voltage at Logic I/O Pins EN -0.3 to 6.0 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 ESD Voltage V Human Body Model (all pins) Machine Model (all pins) (1) (1) Power Dissipation (TA = 25°C) (2) Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Board (3), (4) (5) Operational Package Temperature [Ambient Temperature] (6) VESD1 ±500 VESD2 ±100 PD 800 mW RθJA 60 °C/W RθJB 20 °C/W TA -40 to 125 °C Notes 1. ESD1 testing is performed in accordance with the Human Body Model (CZAP = 100 pF, RZAP = 1500 Ω). ESD2 testing is performed in accordance with the Machine Model (CZAP = 200 pF, RZAP = 0 Ω) 2. 3. 4. 5. 6. 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. 33998 5 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS Table 2. Maximum Ratings (continued) All voltages are with respect to ground unless otherwise noted. Rating Operational Junction Temperature Storage Temperature Peak Package Reflow Temperature During Reflow 7. 8. (7) (8) , Symbol Value Unit TJ -40 to 150 °C TSTG -55 to 150 °C TPPRT Note 8 °C Pin 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. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics. 33998 6 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. 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 VPWR(N) 6.0 – 18 Extended Operating Voltage Range (9) VPWR(E) 18 – 26.5 Maximum Transient Voltage - Load Dump (10) VPWR(LD) – – 40 25 – 150 5.0 – 15 0.5 – 3.0 50 – 350 Unit GENERAL Supply Voltage Range Normal Operating Voltage Range V (9) VPWR Supply Current IVPWR EN = 5.0 V, VPWR = 14 V, No Loads VPWR Quiescent Supply Current mA µA IQVPWR EN = 0 V, VPWR = 12 V KA_VPWR Supply Current, IKAVPWR EN = 5.0 V, KA_VPWR = 14 V, No Load on VKAM KA_VPWR Quiescent Supply Current mA µA IQKAVPWR EN = 0 V, KA_VPWR = 12 V V BUCK REGULATOR (VDDH) Buck Converter Output Voltage VDDH IVDDH = 200 mA to 1.4 A, VPWR = KA_VPWR = 14 V Buck Converter Output Voltage V 4.9 – 5.1 4.9 – 5.1 -20 – 30 VDDH IVDDH = 1.4 A, VPWR = KA_VPWR = 6.0 V VDDH Line Regulation V REGLNVDDH VPWR = KA_VPWR = 10 V to 14 V, IVDDH = 200 mA mV VDDH Load Regulation mV VPWR = KA_VPWR = 14 V, IVDDH = 200 mA to 1.4 A REGLDVDDH -20 – 20 -20 – 20 1.0 – 15 BVDSS 45 – – V ISCSW1 – -7.0 – A VPWR = KA_VPWR = 6.0 V, IVDDH = 200 mA to 1.4 A VDDH Active Discharge Resistance Ω RHDISCH VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 10 mA P-CHANNEL MOSFET Drain-Source Breakdown Voltage—Not Tested (11) Drain-Source Current Limit—Not Tested (11) Notes 9. VDDH is fully functional when the 33998 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. 33998 7 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. 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 2.5 2.6 2.7 Unit LINEAR REGULATOR (VDDL) VDDL Output Voltage VDDL VPWR = KA_VPWR = 14 V, IVDDL = 200 mA VDDL Line Regulation REGLNVDDL VDDH = 4.8 V to 5.2 V, IVDDL = 400 mA VDDL Load Regulation -30 – 30 -70 – 70 5.0 11 25 mV IDRVL VPWR = KA_VPWR = 14 V, VDRVL = 1.0 V VDDL Active Discharge Resistance mV REGLDVDDL VPWR = KA_VPWR = 14 V, IVDDL = 10 mA to 400 mA DRVL Output Current V mA Ω RLDISCH VPWR = KA_VPWR = 14 V, EN = 0 V, IFBL = 10 mA 1.0 – 10 0.6 – 10 CVDDL – 68 – µF ESRVDDL – 0.125 – Ω 2.5 – 2.7 VPWR = KA_VPWR = 26 V, IVKAM = 0.5 mA 2.5 – 2.7 VPWR = KA_VPWR = 18 V, IVKAM = 5.0 mA 2.5 – 2.7 VPWR = KA_VPWR = 5.0 V, IVKAM = 10.0 mA 2.5 – 2.7 VPWR = 0 V, KA_VPWR = 3.5 V, IVKAM = 5.0 mA 2.0 – 2.7 -20 – 20 VDDH to VDDL Active Clamp Resistance VDDL Output Capacitor Capacitance (12) VDDL Output Capacitor ESR (12) Ω RCLAMP VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 50 mA, VFBKB = 0 V KEEP-ALIVE (STANDBY) REGULATOR (VKAM) VKAM Output Voltage VKAM 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 VKAM Output Capacitor ESR (12) mV 0 – 100 -20 – 60 CVKAM – 4.7 – µF ESRVKAM – 1.4 – Ω REGVKAM EN = 5.0 V, IVKAM = 5.0 mA, VPWR = KA_VPWR = 14 V, IVDDL = 200 mA VKAM Output Capacitor Capacitance (12) mV REGLDDVKAM VPWR = KA_VPWR = 14 V, IVKAM = 1.0 mA to 10 mA Differential Voltage VKAM - VDDL 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 Notes 12. Recommended value. 33998 8 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. 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 Unit SENSOR SUPPLIES (VREF1, VREF2) VREF On-Resistance, TA = -40°C RDS(ON) IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V VREF On-Resistance, TA = +25°C RDS(ON) IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V VREF On-Resistance, TA = +125°C mΩ – – 350 – – 455 500 – 900 RDS(ON) IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V VREF Short-to-Battery Detect Current mΩ ISC_BAT VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V VREF Short-to-Ground Detect Current (13) mA ISC_GND VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V Maximum Output Capacitance (Total) mΩ CVREF mA 500 – 900 33 – 39 nF SUPERVISORY CIRCUITS (VPWR) PWROK Undervoltage Threshold on VDDL, FBL Ramps Down VFBL(THL) VPWR = KA_VPWR = 14 V, IVDDH = 200 mA PWROK Undervoltage Threshold on VDDH – 4.8 5.12 – 5.7 – – 200 2.1 2.4 2.5 4.0 – 5.0 50 – 200 V V Ω V VPWROK(TH) KA_VPWR = 14 V, IVDDH = 200 mA VKAMOK Open Drain On-Resistance 4.5 VKAM(THL) VPWR = KA_VPWR = 14 V, IVDDH = 200 mA VKAMOK Threshold on VPWR, VPWR Ramps Up 2.5 RDS(ON) VPWR = KA_VPWR = 14 V, EN = 5 V, IPwrOK = 5.0 mA VKAMOK Threshold, 2.4 VDDH(THH) VPWR = KA_VPWR = 10 V, IVDDH = 200 mA PWROK Open Drain On-Resistance 2.1 VDDH(THL) VPWR = KA_VPWR = 14 V, IVDDH = 200 mA VDDH Overvoltage Threshold V V Ω RDS(ON) 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. 33998 9 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. 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 Unit CHARGE PUMP (CRES) Charge Pump Voltage VCRES V 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 33998 10 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 4. 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 (14) fSW – 750 – kHz Soft Start Duration (see Figure 2) tSS 5.0 – 15 1.0 – 20 1.0 – 10 BUCK REGULATOR (VDDH) VPWR = KA_VPWR = 6.0 V ms CHARGE PUMP (CRES) Charge Pump Current Ramp-Up Time tCRES VPWR = KA_VPWR = 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V Charge Pump Ramp-Up Time ms tCRES VPWR = KA_VPWR = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V ms SENSOR SUPPLIES (VREF1, VREF2) VREF Overcurrent Detection Time (see Figure 3) VREF Retry Timer Delay (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 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 (VPWR) 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 tD(VPWR) 1.0 – 10 ms tFAULT 1.0 – 10 ms 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. 33998 11 Analog Integrated Circuit Device Data Freescale Semiconductor ELECTRICAL CHARACTERISTICS TIMING DIAGRAMS VPWR (V) VPWR (V) KA_VPW R KA_VPWR (V) (V) TIMING DIAGRAMS EN (V) (V) EN 6.0 0 5.0 2.5V 0 VDDH (V) VDDH(V) t SS 5.0 4.8V 0 TIME VPWR SNSEN VPWR (V) SNSNEN KA_VPWR (V) KA_VPWR VVREF (V) EN EN (V) REF (V) (V) (V) Figure 4. Soft-Start Time 14 0 5.0 5.0 PWROK PWROK (V) (V) tDet 0 ??V ??V 2.0V 4.8V 2.0V 0 t Ret 2.6 0 TIME VPWR (V) VPWR (V) KA_V PWR KA_VPWR (V) (V) Figure 5. VREF Retry Timer VDDH (V) V DDH(V) EN (V) (V) 14 0 5.0 0 5.0 PWROK PWROK (V) (V) 0 4.6V tD(PWROK) 2.6 0 TIME Figure 6. PWROK Delay Timer (Power-On Reset) 33998 12 Analog Integrated Circuit Device Data Freescale Semiconductor KA_VPWR KA_VPWR (V)(V) ELECTRICAL CHARACTERISTICS TIMING DIAGRAMS VKAM OK V KAM (V) VKAM VKAMOK EN(V) (V) (V) (V)(V) EN 6.0 VPW R = 0V 0 5.0 0 2.6 2.4V tD(VKAMOK) 0 2.6 0 TIME VDDH VDDH (V) (V) 18 0 5.0 0 VPWR V PWR (V) EN (V) EN(V) KA_VPW R KA_VPWR (V) Figure 7. VKAMOK Delay Time 18 t D(VPWR) 0 5.0 2.0V 0 TIME VPWR VPWR KA_V(V) VDDH V DDL PWR VDDH(V) (V) EN (V)KA_VPWR (V) VDDH (V) EN (V) (V) (V) Figure 8. VDDH Power-Up Delay Time 14 0 5.0 0 2.6 0 5.0 4.7V 4.7V 1.0V 0 1.0V PWROK ROK PW (V) (V) tFault tFault 2.6 0 TIME Figure 9. Fault-Off Timer Delay Time 33998 13 Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 33998 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 2.6 V linear regulator uses an external pass transistor, thus reducing the power dissipation of the integrated circuit. The 33998 also provides a 2.6 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-toground. 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 33998 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 33998. 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). 2.6 V LINEAR REGULATOR (VDDL) The 2.6 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. SENSOR SUPPLIES (VREF1) AND (VREF2) The sensor supplies are implemented using a protected switch to the main 5.0 V (switching regulator) output. The 33998 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 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 REGULATOR, STANDBY (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 2.6 V. A severe fault condition on the VKAM output is signaled by pulling the VKAMOK signal low. KEEP-ALIVE OPERATION, STANDBY, POWERDOWN MODE (VKAM) 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. 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). 33998 14 Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION 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 33998 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. 33998 15 Analog Integrated Circuit Device Data Freescale Semiconductor TYPICAL APPLICATIONS FUNCTIONAL PIN DESCRIPTION TYPICAL APPLICATIONS 33998 Cf1 10uF Lf1 10uH VPWR Cf2 C1 1.0uF 100uF 4 C2 1.0uF Ramp Soft Start Dp1 9 D1 Drive I-lim C4 100nF 11 VSUM Osc 12 Cc 1 2.2nF V bg KA_VPWR Dp2 R3 C3 2.2R 68uF C8 390pF Optional Snubber FBKB Logic & Latch Enb VDDH = 5.0V @ 1400mA total L1 15uH VSW Rc1 3.6k VDDH 2 15 Retry VREF1 Reg. Bandgap Voltage Reference Snsenb Vbg 2.6V Linear Regulator Driver Enb DRVL 14 VREF1 21 Cs1 33nF Enb Retry POR Snsenb VREF2 Reg. V bg 2.6V Standby Reg. Snsenb Enable Control Enb CRES 3 SNSEN 22 EN 23 VKAM = 2.6V @ 10mA VKAM 24 C7 4.7uF R1 10k R2 10k 10 VKAMOK PwrOK Charge Pump C5 100nF VDDL = 2.6V @ 400mA C6 68uF PWROK VREF2 16 Cs2 33nF Q1 13 FBL 1 VkamOK 5-8 17-20 GND 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 10. 33998 Application Circuit Schematic Diagram 33998 16 Analog Integrated Circuit Device Data Freescale Semiconductor TYPICAL APPLICATIONS FUNCTIONAL PIN DESCRIPTION Table 5. Recommended Components Designator Value / Rating Description / Part No. Manufacturer (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 (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 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 CDRH127-100M Sumida or SLF10145-100M2R5 TDK L1 15 µH 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 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. Freescale Semiconductor does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or tables. While Freescale Semiconductor offers component recommendations in this configuration, it is the customer’s responsibility to validate their application. 17. Freescale Semiconductor does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or tables. While Freescale Semiconductor offers component recommendations in this configuration, it is the customer’s responsibility to validate their application. 33998 17 Analog Integrated Circuit Device Data Freescale Semiconductor PACKAGING PACKAGE DIMENSIONS PACKAGING PACKAGE DIMENSIONS For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below. DWB SUFFIX EG SUFFIX (PB-FREE) 24 PIN SOIC WIDE BODY PLASTIC PACKAGE 98ASB42344B ISSUE F 33998 18 Analog Integrated Circuit Device Data Freescale Semiconductor REVISION HISTORY REVISION HISTORY Revision 2.0 Date 8/2006 Description of Changes • • • • • Implemented Revision History page Converted to Freescale format Update to the prevailing form and style Removed MC33998EG/R2, and replaced with MCZ33998EG/R2 in the Ordering Information block Removed Peak Package Reflow Temperature During Reflow (solder reflow) parameter from Maximum Ratings on page 5. Added note with instructions from www.freescale.com. 33998 Analog Integrated Circuit Device Data Freescale Semiconductor 19 How to Reach Us: Home Page: www.freescale.com E-mail: support@freescale.com RoHS-compliant and/or Pb-free versions of Freescale products have the functionality and electrical characteristics of their non-RoHS-compliant and/or non-Pb-free counterparts. For further information, see http://www.freescale.com or contact your Freescale sales representative. For information on Freescale’s Environmental Products program, go to http:// www.freescale.com/epp. USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. 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