Advanced Power Electronics Corp. APE8858 ULTRA LOW OUTPUT VOLTAGE LINEAR N-FET CONTROLLER FEATURES DESCRIPTION The APE8858 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 APE8858 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 APE8858 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. Low ESR Output Capacitor (MLCC and POSCAP) Applicable 0.5V Reference Voltage with 2% Accuracy Internal Soft-Start Enable Control Under-Voltage Short Circuit Protection Fast Transient Response Power OK Output with a Delay Time Adjustable Output Voltage Down to 0.5V Drive N-Channel MOSFETs Halogen Free & RoHS Compliant TYPICAL APPLICATION Vin=1.8V C1 VCC=5V 4.7uF U1 1 C3 0.1uF 2 3 VCC DRV GND FB POK EN 6 Q1 MOSFET N Vout=1.5V 5 4 1000pF APE8858 R1 20K C2 R2 10K 10uF R1 VOUT = 0.5V * (1 + ------ ) R2 VFB = 0.5V ; R2 range 1 ~ 100k 10K ORDERING INFORMATION APE8858 -HF Package Halogen Free Y : SOT-26 Data and specifications subject to change without notice 1 200905086 Advanced Power Electronics Corp. APE8858 ABSOLUTE MAXIMUM RATINGS (at T =25°C) A VCC …………………………………………………… -0.3V to 7V DRV to GND …………………………………………… -0.3V to VCC+0.3V 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 INFORMATION (Top View) 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 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 ICC EN= VCC - 0.4 0.8 mA EN= 0V Supply Voltage Range Supply Current VCC Shutdown Current ISD Feedback Voltage VFB Feedback Pin Input Current IFB 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 TSS -1 - 1 uA 0.49 0.5 0.51 V -100 - 100 nA ms - 1 - VENH Enable 1.3 - - VENL Disable - - 0.5 IOUT=0mA, VIN=5V -1 - +1 VTH(UV) VFB Falling 0.2 0.25 0.3 V TON VFB < 0.25V - 30 - % Sourcing,VFB=0.48V - 20 - - 20 - 4.9 - 5.0 V 90% 93% 96% 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 uA mA 2 Advanced Power Electronics Corp. APE8858 ELECTRICAL SPECIFICATIONS(Cont.) Parameter SYM POK Threshold Voltage for Power Not OK VPNOK POK Low Voltage POK Delay Time Thermal Shutdown Temperature TEST CONDITION VFB Falling POK sinks 1mA TDELAY TSD Thermal Shutdown Hysteresis MIN TYP MAX UNITS 82% 85% 88% 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 EN VCC H : Normal Operation L : Shutdown Input Voltage BLOCK DIAGRAM 3 Advanced Power Electronics Corp. APE8858 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) APE8858 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 ) , APE8858 starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8858. 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. APE8858 TYPICAL CHARACTERISTICS Load Regulation(VOUT ) Temperature Vs V FB 0.512 1.215 0.509 1.213 1.211 1.209 0 503 VOUT (V) VFB (V) 0.506 0.500 0.497 1.207 1.205 1.203 1.201 0.494 1.199 0.491 1.197 1.195 0.488 -40℃ -25℃ 0℃ 25℃ Temperature 50℃ 75℃ 100℃ 0 0.5 1 1.5 2 2.5 3 IOUT(A) 5 ADVANCED POWER ELECTRONICS CORP. Package Outline : SOT-26 G L L Millimeters C A SYMBOLS MIN NOM MAX A 2.70 2.90 3.10 B 2.60 2.80 3.00 C 1.40 1.60 1.80 D 0.30 0.43 0.55 E 0.00 0.05 0.10 B D H 1.20REF G 1.90REF I 0.12REF J 0.37REF L 0.95REF H E I 1.All Dimension Are In Millimeters. J 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : SOT-26 Part Number : RO ROXXX Date Code : XXX 6