Advanced Power Electronics Corp. APE8901 1A ULTRA LOW DROPOUT LINEAR REGULATOR DESCRIPTION FEATURES Ultra Low Dropout - 0.2V(typical) at 1A Output Current Low ESR Output Capacitor (Multi-layer Chip Capacitors (MLCC)) Applicable 0.8V Reference Voltage Fast Transient Response Adjustable Output Voltage by External Resistors Power-On-Reset Monitoring on Both VCNTL and VIN Pins Internal Soft-Start Under-Voltage Protection Current-Limit and Thermal Shutdown Protection Power-OK Output with a Delay Time ESOP-8 and DFN 2x2 Pb-Free Packages. The APE8901 is a 1A ultra low dropout linear regulator. This product is specifically designed to provide well supply voltage for front-side-bus termination on motherboards and NB applications. The IC needs two supply voltages, a control voltage for the circuitry and a main supply voltage for power conversion, to reduce power dissipation and provide extremely low dropout. The APE8901 integrates many functions. A Power-On-Reset (POR) circuit monitors both supply voltages to prevent wrong operations. A thermal shutdown and current limit functions protect the device against thermal and current over-loads. A POK indicates the output status with time delay which is set internally. It can control other converter for power sequence. The APE8901 can be enabled by other power system. Pulling and holding the EN pin below 0.3V shuts off the output. The APE8901 is available in ESOP-8 and DFN 2x2 packages. That features small size as SOP-8 with an Exposed Pad to reduce the junction-to-case resistance, being applicable in 2~3W applications. TYPICAL APPLICATION CIRCUIT 1. Using an Output Capacitor with ESR > 20mΩ R3 1K U1 VCNTL=5V VIN=1.5V VIN VCNTL C2 ON POK EN C1 OFF 1uF NC C3 100uF 0.1uF VOUT GND FB APE8901 Vout=1.2V/1A R1 1K C6 12~48nF R2 2K C4 C5 220uF 0.1u 2. Using an MLCC as the Output Capacitor R3 1K U2 VCNTL=5V VCNTL VIN=1.5V VIN C3 ON POK EN C1 1uF NC 22uF VOUT OFF GND APE8901 VOUT=VFB x (1+R1/R2) VFB =0.8V Data and specifications subject to change without notice Vout=1.2V/1A FB R1 39K C6 C5 56pF 22u R2 78K 1 201010203 Advanced Power Electronics Corp. APE8901 ABSOLUTE MAXIMUM RATINGS (at TA=25oC) VCNTL Supply Voltage (VCNTL) --------------------------- -0.3V to 7V VIN Supply Voltage (VIN) ---------------------------------- -0.3V to 6V EN & FB Pin Voltage (VI/O) ------------------------------- -0.3V to VCNTL+0.3V Power Voltage (VPOK) --------------------------------------- -0.3V to 7V Power Dissipation (PD) ESOP-8 ------- 3W DFN 2x2 ------ 0.8W Storage Temperature Range (TST) ---------------------- -65°C To 150°C Junction Temperature Range (TJ) ----------------------- -40°C To 125°C Operating Temperature Range (TOP) ------------------- -40°C To 85°C Thermal Resistance Junction to Ambient (Rth ja) ESOP-8 ------- 40°C/W DFN 2x2 ------ 125°C/W Thermal Resistance Junction to Case (Rthjc) ESOP-8 ------- 15°C/W DFN 2x2 ------ 20°C/W Note. Rthja is measured with the PCB copper area (need connect to Expose-Pad) of approximately 1.5 in2 (Multi-layer) by ESOP-8 and DFN-8L packages. RECOMMENDED OPERATING CONDITIONS VCNTL Supply Voltage (VCNTL) -------------------------- 3V to 6V VIN Supply Voltage (VIN) ---------------------------------- 1V to 5.5V Output Voltage (VOUT) -------(V CNTL-VOUT > 1.9V)----- 0.8V to 2.8V Output Current (I OUT) --------------------------------------- 0 to 1A ORDERING / PACKAGE INFORMATION APE8901X Package Type MP : ESOP-8 GN2 : DFN 2x2 GND FB VOUT NC ( Top View ) POK 1 EN 2 VIN 3 VCNTL 4 8 GND 8 7 FB GND 6 6 5 GND VOUT 5 NC ESOP-8 7 1 2 POK EN 3 4 VIN VCNTL DFN 2x2 (TOP VIEW) 2 Advanced Power Electronics Corp. APE8901 ELECTRICAL SPECIFICATIONS o (VCNTL = 5V, VIN = 1.5V, VOUT = 1.2V, TA=25 C unless otherwise specified) Parameter SYM VCNTL POR Threshold VCNTL VCNTL POR Hysteresis TEST CONDITION MIN TYP MAX UNITS 2.5 2.7 2.9 V VCNTL(hys) - 0.4 - V VIN POR Threshold VIN 0.8 0.9 1 V VIN POR Hysteresis VIN(hys) VCNTL Nominal Supply Current ICNTL VCNTL Shuntdown Current ISD Feedback Voltage VFB Ripple Rejection 10 30 uA V 0.25 % VOUT<2.0V,IOUT=1A - 200 250 2.0V<VOUT<2.8V,IOUT=1A - 250 300 EN=0V - 90 120 Ω - 2 - ms VENH Enable 1.2 - - VENL Disable - - 0.4 - 50 - mV EN=GND - 10 - uA 1.2 - - A - 70 - - 65 - VFB Falling - 0.4 - V ILIM VIN VCNTL - 0.816 IEN Current Limit mA 0.8 EN Hysteresis EN Pin Pull-Up Current V 2 0.06 TSS EN Pin Logic High Threshold Voltage - 1 - VOUT Pull Low Resistance VCNTL=3 ~ 6.0V 0.5 0.784 VDROP Soft Start Time EN= 0V 0.4 IOUT=0A ~ 1A Load Regulation Dropout Voltage EN= VCNTL PSRR Under-Voltage Threshold o VCNTL=3~6.0V, TJ= -40 ~ 125 C F=120Hz, IOUT=100mA mV V dB POK Threshold Voltage for Power OK VPOK VFB Rising 89% 92% 95% VFB POK Threshold Voltage for Power Not OK VPNOK VFB Falling 78% 81% 84% VFB - 0.25 0.4 V POK Low Voltage POK Delay Time Thermal Shutdown Temp POK sinks 5mA TDELAY 0.8 2 10 mS TSD - 150 - °C - 40 - °C Thermal Shutdown Hysteresis PIN DESCRIPTIONS PIN SYMBOL FB PIN DESCRIPTION Feedback Pin EN Internal Pull High. EN=High or Floating → Enable EN=Low → Shutdown Mode VIN Input voltage. POK Power OK Output Pin VCNTL NC CNTL Pin Input Voltage No connect VOUT Output Voltage GND GND Pin. 3 Advanced Power Electronics Corp. APE8901 BLOCK DIAGRAM N-MOSFET VIN Enable UV Thermal Shutdown GND + - 90Ω + Bandgap FB 0.4V Delay + EN Soft-Start And Control Logic Error Amp POK - VCNTL Current Limit Power -ON Reset VOUT 90% Vref POK PIN DESCRIPTION FB Connecting this pin to an external resistor divider receives the feedback voltage of the regulator. The output voltage set by the resistor divider is determined by: Where R1 is connected from VOUT to FB with Kelvin sensing and R2 is connected from FB to GND. A bypass capacitor may be connected with R1in parallel to improve load transient response. The recommended R2 and R1 are in the range of 1K~100kΩ. VIN Main supply input pins for power conversions. The voltage at this pin is monitored for PowerOn Reset purpose. VCNTL Power input pin of the control circuitry. Connecting this pin to a +5V (recommended) supply voltage provides the bias for the control circuitry. The voltage at this pin is monitored for Power-On Reset purpose. POK Power-OK signal output pin. This pin is an open-drain output used to indicate status of output voltage by sensing FB voltage. This pin is pulled low when the rising FB voltage is not above the VPOK threshold or the falling FB voltage is below the VPOK threshold, indicating the output is not OK. EN Enable control pin. Pulling and holding this pin below 0.4V shuts down the output. When reenabled, the IC undergoes a new soft-start cycle. Left this pin open, this pin is internal pulled up to VCNTL voltage, enabling the regulator. 4 Advanced Power Electronics Corp. APE8901 PIN DESCRIPTION VOUT Output of the regulator. Please connect Pin 6 using wide tracks. It is necessary to connect an output capacitor with this pin for closed-loop compensation and improving transient responses. FUNCTION DESCRIPTION Power-On-Reset A Power-On-Reset (POR) circuit monitors both input voltages at VCNTL and VIN pins to prevent wrong logic controls. The POR function initiates a soft-start process after the two supply voltages exceed their rising POR threshold voltages during powering on. The POR function also pulls low the POK pin regardless the output voltage when the VCNTL voltage falls below its 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 2ms. Output Voltage Regulation An error amplifier working with a temperature compensated 0.8V 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. It compares the reference with the feedback voltage and amplifies the difference to drive the output NMOS which provides load current from VIN to VOUT. Current-Limit The APE8901 monitors the current via the output NMOS and limits the maximum current to prevent load and APE8901 from damages during overload or short circuit conditions. Under-Voltage Protection (UVP) The APE8901 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, the APE8901 starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8901. 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 40°C, resulting in a pulsed output during continuous thermal overload conditions. The thermal shutdown designed 5 Advanced Power Electronics Corp. APE8901 TYPICAL PERFORMANCE CHARACTERISTICS VCNTL Supply Current VCNTL Shutdown Current 50 VCNTL Shutdown Current (uA) VCNTL Supply Current (mA) 3 2.5 2 1.5 1 VIN=1.5V VOUT=1.2V No Load 0.5 0 40 30 20 10 0 3 3.5 4 4.5 5 5.5 6 3 3.5 VCNTL (V) VCNTL VS Feedback Voltage 5 5.5 6 Temperature VS VCNTL Supply Current 4 VIN=1.5V VCNTL=5V VOUT=1.2V No Load 3.5 VCNTL Supply Current (mA) 0.84 Feedback Voltage (V) 4.5 VCNTL (V) 0.86 0.82 0.8 0.78 VIN=1.5V VOUT=1.2V Load=100mA 0.76 0.74 3 2.5 2 1.5 1 0.5 0 3 3.5 4 4.5 5 5.5 -40℃ -20℃ 0℃ 6 VCNTL (V) 25℃ 50℃ 85℃ 105℃ 125℃ Temperature (℃) Load VS Dropout Load VS Feedback Voltage 0.84 600 0.83 500 VCNTL=5V 0.82 Dropout Voltage (mV) Feedback Voltage (V) 4 0.81 0.8 0.79 0.78 VIN=1.5V VCNTL=5V VOUT=1.2V 0.77 0.76 400 VOUT=3.0V 300 VOUT=2.5V 200 VOUT=1.8V VOUT=1.2V 100 0 3 3.5 4 4.5 Load (mA) 5 5.5 6 0 200 400 600 800 1000 Load (mA) 6 Advanced Power Electronics Corp. APE8901 TYPICAL PERFORMANCE CHARACTERISTICS Temperature VS VCNTL UVLO 3 0.84 2.9 0.83 2.8 VCNTL UVLO (V) Feedback Voltage (V) Temperature VS Feedback Voltage 0.85 0.82 0.81 0.8 0.79 0.78 VIN=1.5V VCNTL=5V VOUT=1.2V Load=10mA 0.77 0.76 0.75 Rising 2.7 2.6 2.5 2.4 2.3 Falling 2.2 2.1 2 -40℃ -20℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃ -40℃ -20℃ 0℃ Temperature (℃) 25℃ 50℃ 85℃ 105℃ 125℃ Temperature (℃) Power –ON Load Transient (VIN=1.5V, VCNTL=5V,VOUT=1.2V,Laod=1A) (VIN=1.5V, VCNTL=5V,VOUT=1.2V,Laod=10m~1A) VCNTL EN VOUT VOUT IIN IOUT Enable –ON Enable –OFF (VIN=1.5V, VCNTL=5V,VOUT=1.2V,Laod=1A) (VIN=1.5V, VCNTL=5V,VOUT=1.2V,No Laod) VCNTL EN EN VOUT VOUT IIN 7 Advanced Power Electronics Corp. APE8901 MARKING INFORMATION ESOP-8 Part Number Package Code 8901MP YWWSSS H3 XXX Date Code (YWWSSS) Y：Last Digit Of The Year WW ：Week SSS：Sequence Part Number : H3 Date Code 8