Advanced Power Electronics Corp. APE8858A FAST TRANSIENT RESPONSE LINEAR CONTROLLER FEATURES DESCRIPTION Low ESR Output Capacitor (MLCC and POSCAP) Applicable 0.5V Reference Voltage with 2% Accuracy Internal Soft-Start Support VID Application Circuit Integrated Hard Short-circuit protection Fast Transient Response Power OK Output with a Delay Time Adjustable Output Voltage Down to 0.5V Over-Temperature Protection RoHS Compliant & Haloge Free The APE8858A is an ultra low output voltage linear NFET controller. This product is specifically designed to provide well supply voltage for front-side-bus termination on motherboards and NB applications. The APE8858A integrates many functions. A Power-On-Reset (POR) circuit monitors supply voltages to prevent wrong operations. A POK indicates the output status with time delay which is set internally. It can control other converter for power sequence. The APE8858A can be enabled by other power system. A 0.5V reference voltage with 2% accuracy provide tight regulation of the output voltage, enable control, open drain power good signal, under-voltage protection and soft start. The APE8858A is available in a space saving SOT-26 package. TYPICAL APPLICATION VIN APE8858A VCC =5V CV CC 0.1uF RP OK 100k VCC DRV POK FB EN GND Q1 AP4434AGH Cin 10uF VOUT =1.8V R1 26k CF Cout 10uF R2 10k Data and specifications subject to change without notice 1 20130108V1.1 Advanced Power Electronics Corp. APE8858A ABSOLUTE MAXIMUM RATINGS (at TA=25°C) VCC ----------------------------------------------------------- -0.3V to 7V DRV to GND ------------------------------------------------- -0.3V to VCC+0.3V Other Pin ------------------------------------------------------ -0.3V to 6V Power Dissipation (SOT-26) ---------------------------- 0.4W Storage Temperature Range ---------------------------- -65 to 150°C Operating Temperature Range ------------------------- -40 to 85°C Junction Temperature Range --------------------------- -40 to 125°C PACKAGE / ORDERING INFORMATION (Top View) APE8858A X Package Type Y : SOT-26 VCC 1 6 GND 2 5 FB POK 3 4 DRV EN SOT-26 Rthja=250°C/W ELECTRICAL SPECIFICATIONS (VIN=1.5V, VSHDN=VIN, TA=25°C, CIN=COUT=1µF, unless otherwise noted.) Parameter SYM Supply Voltage Range VCC TEST CONDITION MIN TYP MAX UNITS 4.5 - 5.5 V Input Voltage UVLO Threshold VUVLO VCC rising - 3.75 - V Input Voltage UVLO Hysteresis VHYST VCC falling - 0.25 - V Supply Current ICC EN= VCC - 0.4 0.8 mA Shutdown Current ISD EN= 0V -1 - 1 uA Feedback Voltage VFB 0.49 0.5 0.51 V Feedback Pin Input Current IFB -100 - 100 nA ms Soft Start Time EN Pin Logic High Threshold Voltage EN Pin Input Current Output Voltage UVLO Threshold Ton Duty DRV Output Current VFB =0.5V - 1 - VENH TSS Enable 1.3 - - VENL Disable - - 0.5 IOUT=0mA, VIN=5V -1 - +1 uA VTH(UV) VFB Falling 0.2 0.25 0.3 V TON VFB < 0.25V - 30 - % Sourcing,VFB=0.48V - 20 - - 20 - 4.8 - 5.0 V 93% 95% 97% VFB IEN IDRV(SRC) IDRV(SINK) Sinking ,VFB=0.52V DRV Pin Output Voltage VDRV VFB=0.48V,VCC=5V, no load POK Threshold Voltage for Power OK VPOK VFB Rising V mA 2 Advanced Power Electronics Corp. APE8858A ELECTRICAL SPECIFICATIONS(Cont.) Parameter SYM POK Threshold Voltage for Power Not OK VPNOK POK Low Voltage TEST CONDITION VFB Falling POK sinks 1mA POK Delay Time TDELAY Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis MIN TYP MAX UNITS 86% 89% 93% VFB - 50 100 mV 0.8 2 10 ms - 150 - °C - 50 - °C PIN DESCRIPTIONS PIN SYMBOL FB PIN DESCRIPTION Feedback Pin GND Common Ground Pin DRV Gate Drive to N-FET POK Power ok Output Pin H : Normal Operation EN L : Shutdown Input Voltage VCC BLOCK DIAGRAM DRV VCC EN Power On Reset Enable Error Amp Bandgap Soft -Start And Control Logic Thermal Shutdown UV FB 0.25V GND Delay POK 95% VREF POK 3 Advanced Power Electronics Corp. APE8858A FUNCTION DESCRIPTIONS Power-On-Reset A Power-On-Reset (POR) circuit monitors input voltages at VCC pins to prevent wrong logic controls. The POR function initiates a soft-start process after the supply voltages exceed the rising POR threshold voltages during powering on. The POR function also pulls low the POK pin regardless the output voltage when the VCC voltage falls below it’s falling POR threshold. Internal Soft-Start An internal soft-start function controls rise rate of the output voltage to limit the current surge at start-up. The typical soft-start interval is about 1ms. Output Voltage Regulation An error amplifier working with a temperature compensated 0.5V reference and an output NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. Under-Voltage Protection (UVP) APE8858A monitors the voltage on FB pin after soft-start process is finished. Therefore the UVP is disabling during soft-start. When the voltage on FB pin falls below the under-voltage threshold, the UVP circuit shuts off the output immediately. After a while ( ~ 70% Duty ) , APE8858A starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8858A. When the junction temperature exceeds +150 ° C, a thermal sensor turns off the output NMOS, allowing the device to cool down. The regulator regulates the output again through initiation of a new soft-start cycle after the junction temperature cools by 50°C, resulting in a pulsed output during continuous thermal overload conditions. 4 Advanced Power Electronics Corp. APE8858A TYPICAL PERFORMANCE CHARACTERISTICS POK with CF=1nF VOUT without CF VDRV IOUT=0A~1.5A IOUT Fig.2 Load Transient, 3Vi to 1.8Vo 520 4.0 516 3.8 512 3.6 508 3.4 504 3.2 VCC (V) VFB (mV) Fig.1 Hard Short Circuit Protection 500 3.0 496 2.8 492 2.6 488 2.4 rising 484 2.2 falling 480 2.0 -40 -20 0 20 40 60 80 100 120 -40 -20 0 T J (°C) 40 60 80 T J (°C) Fig.3 Feedback Voltage vs. Temperature Fig.4 UVLO vs. Temperature 1.0 1.0 0.9 0.9 0.8 0.8 0.7 0.7 ISD (uA) IQ (mA) 20 0.6 0.5 0.6 0.5 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.0 0.0 -40 -20 0 20 40 60 T J (°C) Fig.5 Supply Current vs. Temperature 80 -40 -20 0 20 40 60 80 T J (°C) Fig.6 Shutdown Current vs. Temperature 5 Advanced Power Electronics Corp. APE8858A APPLICATION CIRCUIT VIN =1.05V U1 V CC=5V C1 0.1uF RP OK VCC DRV POK FB Q1 AP4434AGH Cin 10uF POK 100k EN EN V OUT=0.9V/6A R1 10k GND CF 1nF + Cout 330uF (ESR >15mΩ) APE8858A R2 30k R3 71k VID0 R5 Q2 10k C2 4.7nF R4 34k VID1 R6 Q3 10k C3 4.7nF VID1 VID0 Vo (V) 0 0 0.675 0 1 0.725 1 0 0.8 1 1 0.9 APE8858A with output voltage step function from 0.9V to 0.675V 6 Advanced Power Electronics Corp. APE8858A MARKING INFORMATION SOT-26 Part Number : HE HESS Date Code SS:2004,2008,2012… SS:2003,2007,2011… SS:2002,2006,2010… SS:2001,2005,2009… 7