Advanced Power Electronics Corp. APE8981 3A ULTRA LOW DROPOUT LINEAR REGULATOR FEATURES DESCRIPTION Ultra Low Dropout 0.21V(typical) @ 2A Output Current for 1.2V Output Voltage Low ESR Output Capacitor (Multi-layer Chip Capacitors (MLCC)) Applicable EN Pull-low for APE8981MP-A EN Pull-high for APE8981MP-B Fast Transient Response Adjustable Output Voltage by External Resistors Power-On-Reset Monitoring on Both VCNTL and VIN Pins Internal Soft-Start Current-Limit and Thermal Shutdown Protection Power-OK Output with a Delay Time SO-8 with Exposed Pad Pb-Free & DFN 3x3-10L Package. Halogen Free Product The APE8981 series is a 3A 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 APE8981 series integrates many functions. A Power-OnReset (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 APE8981 series can be enabled by other power system. Pulling and holding the EN pin below 0.4V shuts off the output. The APE8981 series is available in DFN 3x3-10L & ESOP-8 package which features small size as SO-8 and an Exposed Pad to reduce the junction-to-case resistance. TYPICAL APPLICATION POK R3 U1 POK GND 10k EN VIN VCNTL EN FB VIN VOUT VCNTL C1 4 .7 uF C2 1 uF Data and specifications subject to change without notice NC VOUT R1 20k CF *option Cout 10uF APE8981 R2 10k 1 201301046 Advanced Power Electronics Corp. APE8981 PACKAGE/ORDERING INFORMATION ( Top View ) APE8981X-X EN Function Package Type MP : ESOP-8 A : Internal Pull Low GN3 : DFN 3x3-10L B : Internal Pull High POK 1 EN 2 ( Top View ) 8 GND 7 FB GND VIN 3 6 VCNTL 4 5 NC VOUT VOUT VOUT VOUT FB POK 1 2 3 4 5 GND 10 VCNTL 9 VIN 8 VIN 7 VIN 6 EN DFN 3x3-10L ESOP-8 ABSOLUTE MAXIMUM RATINGS (Note1) CNTL Supply Voltage (VCNTL) --------------------------- -0.3V To 6.5V Input Supply Voltage (VIN) ------------------------------- -0.3V To 6.5V EN & FB Pin Voltage (VEN/VFB) ------------------------- -0.3V To VCNTL+0.3V Power Good Voltage (VPOK) ---------------------------- -0.3V To 6.5V Power Dissipation (PD) ---------------------------------- 2.5W Storage Temperature Range (T ST) -------------------- -65°C To 150°C Junction Temperature Range (T J) --------------------- -40°C To 150°C Thermal Resistance Junction to Ambient (Rth ja)Note ESOP-8 ------- 40°C/W DFN 3x3-10L Thermal Resistance Junction to Case (Rth jc) 62.5°C/W Note ESOP-8 ------- 15°C/W DFN 3x3-10L 17°C/W Note. mounted on a Demo board RECOMMENDED OPERATING CONDITIONS Operating Junction Temperature Range (T OJ) ----- -40°C To 125°C Operating Ambient Temperature Range (T OA) ----- -40°C To 85°C VCNTL Supply Voltage (VCNTL) ------------------------- 3V To 6V Input Supply Voltage (VIN) ------------------------------- 1.1V To 5.5V Output Voltage (VOUT)@VCNTL > VOUT + 2.5V ------- 0.8V To 2.8V Output Cunrrent (IOUT) ------------------------------------ 0A To 3A 2 Advanced Power Electronics Corp. APE8981 ELECTRICAL SPECIFICATIONS VCNTL= 5V, VIN=1.8V, VOUT=1.2V, TA=25oC unless otherwise specified Parameter VIN POR Threshold SYM VIN VIN POR Hysteresis VIN(hys) VCNTL Nominal Supply Current ICNTL VCNTL Shutdown Current ISD Feedback Voltage VFB EN= VCNTL RDS(ON) On Resistance VDROP Dropout Voltage VOUT Pull Low Resistance Soft Start Time MAX 1 UNITS - 0.5 - V mA 1.3 - - 1 APE8981MP-B - 10 30 0.784 0.8 0.816 V - 0.5 1 % - 105 150 mΩ IOUT = 2A, VCNTL=5V, VOUT = 1.2V - 0.21 0.3 V EN=0V - 40 - Ω - 0.2 - ms EN=0V VCNTL=3 ~ 6V, IOUT=10mA, VIN=VOUT+0.5~5.5V IOUT=100mA, VCNTL=VEN=5.0V, VOUT=1.2V Enable 1.2 - - VENL Disable - - 0.6 IEN Current Limit ILIM PSRR V - VENH EN Pin Pull-Up Current VIN VCNTL TYP 0.9 - TSS EN Pin Logic High Threshold Voltage MIN 0.8 APE8981MP-A IOUT=0A ~ 2A Load Regulation Ripple Rejection TEST CONDITION EN=5V, APE8981MP-A - 10 20 EN=GND, APE8981MP-B - 10 20 3.1 - - - 65 - - 65 - VCNTL=5V, VIN=VOUT+1V F=120Hz, IOUT=100mA uA V uA A dB POK Threshold Voltage for Power OK VPOK VFB Rising 92% 94% 96% VFB POK Threshold Voltage for Power Not OK VPNOK VFB Falling 83% 88% 91% VFB - - 0.1 V TDELAY 0.8 2 10 ms TSD - 160 - o C - 40 - o C POK Low Voltage POK sinks 5mA POK Delay Time Thermal Shutdown Threshold (Note1) Thermal Shutdown Hysteresis (Note1) Note1: Guarantee by design, not production tested. 3 Advanced Power Electronics Corp. APE8981 PIN DESCRIPTIONS PIN SYMBOL POK PIN DESCRIPTION Power OK Output Pin APE8981MP-A: Internal pull low; HIGH for enable, LOW or floating for shutdown. EN APE8981MP-B: Internal pull high; HIGH or floating for enable, LOW for shutdown. VIN Supply input for power conversion. The pin is monitored for Power-On Reset purpose. Power input pin of the control circuitry. The pin is monitored for Power-On Reset VCNTL purpose. NC No Connect VOUT Output Voltage FB Feedback Pin GND GND Pin BLOCK DIAGRAM APE8981MP-A N-MOSFET VIN Current Limit Power- ON Reset VCNTL EN Enable Soft -Start And Control Logic + Error Amp Bandgap Thermal Shutdown FB + 10uA - VOUT Delay POK - GND 94% V REF POK APE8981MP-B N-MOSFET VIN VCNTL 10uA EN Current Limit Power- ON Reset Enable - Soft -Start And Control Logic + VOUT Error Amp Bandgap Thermal Shutdown + FB Delay POK - GND 94% V REF POK 4 Advanced Power Electronics Corp. APE8981 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 R1 in parallel to improve load transient response. The R2 range in 1K~4.7KΩ for AL output capacitor and 30K~100KΩ for MLCC output capacitor are recommended. 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 PowerOn 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. For APE8981MP-B, this pin is internal pulled up to VCNTL voltage, enabling the regulator. For APE8981MP-A, this pin is internal pulled down to GND voltage, shutdown the regulator. The pull-high current is 10uA (typ.) 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 0.2ms. 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. 5 Advanced Power Electronics Corp. APE8981 FUNCTION DESCRIPTION Current-Limit The APE8981 monitors the current via the output NMOS and limits the maximum current to prevent load and APE8981 from damages during overload or short circuit conditions. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8981. When the junction temperature exceeds +160°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. APPLICATION INFORMATION Capacitor Selection Normally, use a MLCC capacitor on the input and output of the APE8981. Larger input capacitor values provide better supply-noise rejection and transient response. A higher- value output capacitor may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. The X5R and X7R type in MLCC is recommended. For aluminum electrolytic capacitor application, 100uF in input capacitor and 220uF in output capacitor (30m Ω < ESR < 200m Ω ) are recommended. Output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and PSRR. 6 Advanced Power Electronics Corp. APE8981 TYPICAL PERFORMANCE CHARACTERISTICS 0.820 0.85 VCNTL=5 0.84 0.815 0.83 0.810 0.82 0.805 VO (V) VO (V) 0.81 0.800 0.80 0.79 0.795 0.78 0.790 0.785 Io=0mA 0.77 Io=1A 0.76 0.780 0.75 3 3.4 3.8 4.2 4.6 5 0 0.5 1 V CNTL (V) Line Regulation 2 2.5 3 2 2.5 3 Load Regulation 1000 1000 Vo=2.5V 900 Vo=1.2V 900 Vo=1.8V Vo=1.05V 800 Vo=1.2V 800 700 Vo=1.05V 700 VDROP (mV) VDROP (mV) 1.5 I OUT (A) 600 500 400 600 500 400 300 300 200 200 100 100 0 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 I OUT (A) 1.5 I OUT (A) Dropout Voltage at VCNTL=5V Dropout Voltage at VCNTL=3.3V 20.0 3.0 18.0 16.0 2.5 ICNTL-SD (uA) ICNTL (mA) 14.0 2.0 1.5 1.0 12.0 10.0 8.0 6.0 4.0 0.5 2.0 0.0 0.0 -40 -20 0 20 T J (°C) ICNTL vs. TJ 40 60 80 -40 -20 0 20 40 60 80 T J (°C) ICNTL-SD (APE8981MP-B) vs. TJ 7 Advanced Power Electronics Corp. APE8981 0.90 2.0 0.88 1.8 0.86 1.6 0.84 1.4 VEN (V) VFB (V) TYPICAL PERFORMANCE CHARACTERISTICS 0.82 0.80 VENL 1.2 1.0 0.78 0.8 0.76 0.6 0.74 0.4 0.72 0.2 0.70 VENH 0.0 -40 -20 0 20 40 60 80 -40 T J (°C) 0 20 40 60 80 T J (°C) VFB vs. TJ EN on with POK Delay -20 VEN vs. TJ VEN VIN VOUT VOUT POK POK IOUT=3A IOUT=3A VIN Power –ON 8 Advanced Power Electronics Corp. APE8981 MARKING INFORMATION ESOP-8 Part Number Package Code 8981MP-X YWWSSS EN Function Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence DFN 3x3-10L Part Number EN Function 8981-X YWWS Date Code (YWWS) Y：Last Digit Of The Year WW：Week S：Sequence 9