Advanced Power Electronics Corp. APE8903B 3A ULTRA LOW DROPOUT LINEAR REGULATOR FEATURES DESCRIPTION Ultra Low Dropout 0.23V(typical) @ 2A Output The APE8903B 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 APE8903B series 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 APE8903B series can be enabled by other power system. Pulling and holding the EN pin below 0.4V shuts off the output. The APE8903B series is available in ESOP-8 package which features small size as SO-8 and an Exposed Pad to reduce the junction-to-case resistance, being applicable in 2~3W applications. Current for 1.2V Output Voltage Low ESR Output Capacitor (Multi-layer Chip Capacitors (MLCC)) Applicable EN Pull-low for APE8903BMP-A EN Pull-high for APE8903BMP-B 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 SO-8 with Exposed Pad Pb-Free Package. Halogen Free Product TYPICAL APPLICATION 1. Using an Output Capacitor with ESR≧20mΩ R3 U1 10K VCNTL=5V VCNTL VIN=1.8V VIN C2 ON POK EN C1 NC C3 100uF 0.1uF VOUT OFF GND FB Vout=1.2V/2A 1uF APE8903B R1 1K R2 2K Data and specifications subject to change without notice C6 12~48nF C4 C5 220uF 0.1u 1 201009151 Advanced Power Electronics Corp. APE8903B TYPICAL APPLICATION 2. Using an MLCC as the Output Capacitor R3 10K U2 VCNTL=5V VCNTL VIN=1.8V VIN C3 NC POK ON 4.7uF VOUT EN C1 OFF GND VOUT=1.2V/2A FB 1uF R1 39K APE8903B C6 C5 56pF 10uF R2 78K VOUT=VFB x (1+R1/R2) VFB = 0.8V PACKAGE/ORDERING INFORMATION ( Top View ) APE8903BX-X - HF POK 1 EN 2 8 GND Halogen Free Package Type EN Function MP : ESOP-8 A : Pull Low 7 FB GND VIN 3 6 VCNTL 4 5 NC B : Pull High VOUT 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) --------------------Note Thermal Resistance Junction to Ambient (Rth ja) -40°C To 150°C 40°C/W Thermal Resistance Junction to Case (Rth jc) ------- 15°C/W Note. Rthja is measured with the PCB copper area (need connect to Expose-Pad) of approximately 1.5 in2 (Multi-layer) 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=5V --------------------- 0.8V To 2.8V Output Cunrrent (IOUT) ------------------------------------- 0A To 3A 2 Advanced Power Electronics Corp. APE8903B ELECTRICAL SPECIFICATIONS VCNTL= 5V, VIN=1.8V, VOUT=1.2V, TA=25oC 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) - 0.5 - V 0.4 1 1.5 mA VCNTL Nominal Supply Current ICNTL VCNTL Shutdown Current ISD Feedback Voltage VFB Load Regulation EN= VCNTL APE8903BMP-A - - 1 APE8903BMP-B - 10 30 0.784 0.8 0.816 V - 0.2 1 % - 115 150 mΩ IOUT = 2A, VCNTL=5V, VOUT = 1.2V - 0.23 0.3 V EN=0V - 90 - Ω ms EN=0V VCNTL=3 ~ 6V, IOUT=10mA, VIN=VOUT+0.5~5.5V IOUT=0A ~ 2A On Resistance RDS(ON) Dropout Voltage VDROP VOUT Pull Low Resistance IOUT=100mA, VCNTL=VEN=5.0V, VOUT=1.2V Soft Start Time TSS - 2 - EN Pin Logic High Threshold Voltage VENH Enable 1.2 - - VENL Disable - - 0.6 - 40 - EN=5V, APE8903BMP-A - 10 20 EN=GND, APE8903BMP-B - 10 20 EN Hysteresis IEN EN Pin Pull-Up Current Current Limit Ripple Rejection ILIM VIN VCNTL PSRR EN startup, IOUT=2A Under-Voltage Threshold POK Threshold Voltage for Power OK VPOK POK Threshold Voltage for Power Not OK VPNOK POK Low Voltage Thermal Shutdown Temp Thermal Shutdown Hysteresis F=120Hz, IOUT=100mA VCNTL=5V, COUT=10uF, Inrush current POK Delay Time VCNTL=5V, VIN=VOUT+1V 3.1 - - - 65 - - 65 - - 0.5 - uA V mV uA A dB A VFB Falling - 0.4 - V VFB Rising 89% 92% 95% VFB VFB Falling 78% 81% 84% VFB - 0.25 0.4 V ms POK sinks 5mA TDELAY 0.8 2 10 TSD - 160 - o C - o C - 40 3 Advanced Power Electronics Corp. APE8903B PIN DESCRIPTIONS PIN SYMBOL POK PIN DESCRIPTION Power OK Output Pin Internal Pull High (APE8903BMP-B) or Pull Low (APE8903BMP-A) EN=High or Floating → Enable EN EN=Low → Shutdown Mode Input Voltage. VIN CNTL Pin Input Voltage VCNTL No Connect NC VOUT Output Voltage FB Feedback Pin GND Pin GND BLOCK DIAGRAM APE8903BMP-A N-MOSFET VIN Current Limit Power -ON Reset 10uA Enable EN Soft-Start And Control Logic UV Thermal Shutdown + Error Amp - + Bandgap FB 0.4V + VCNTL VOUT Delay POK - GND 92% VREF POK APE8903BMP-B N-MOSFET VIN Current Limit Power -ON Reset UV 10uA GND Thermal Shutdown + - + Bandgap FB 0.4V Delay + Enable EN Soft-Start And Control Logic Error Amp POK - VCNTL VOUT 92% VREF POK 4 Advanced Power Electronics Corp. APE8903B 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 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. For APE8903BMP-B, this pin is internal pulled up to VCNTL voltage, enabling the regulator. For APE8903BMP-A, this pin is internal pulled down to GND voltage, shutdown the regulator. The pull-high or pull-low 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 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 APE8903B monitors the current via the output NMOS and limits the maximum current to prevent load and APE8903B from damages during overload or short circuit conditions. 5 Advanced Power Electronics Corp. APE8903B FUNCTION DESCRIPTION Under-Voltage Protection (UVP) The APE8903B 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 APE8903B starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8903B. 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 APE8903B. 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 (30mΩ < ESR < 200mΩ) are recommended. Output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and PSRR. 6 Advanced Power Electronics Corp. APE8903B TYPICAL PERFORMANCE CHARACTERISTICS Load Regulation 0.820 0.815 0.815 0.810 0.810 0.805 0.805 VFB (V) VFB (V) Line Regulation 0.820 0.800 0.795 0.800 0.795 0.790 0.790 VIN=1.8V, VOUT=1.2V IOUT=10mA 0.785 0.780 0.780 3 3.5 4 4.5 5 5.5 VCNTL=5V, VIN=1.8V, VOUT=1.2V 0.785 0 6 0.5 1 VCNTL (V) Dropout Voltage (VCNTL=3.3V) 800 Dropout Voltage (mV) Dropout Voltage (mV) 600 VOUT=1.5V 400 300 VOUT=1.2V 200 100 0 2.5 3 500 VOUT=2.5V VOUT=1.8V 400 300 VOUT=1.2V 200 100 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 IOUT (A) 1.5 2 2.5 3 IOUT (A) Temperature VS Quiescent Current Temperature VS V FB 0.820 2 0.815 1.8 1.6 0.810 1.4 ICNTL (mA) 0.805 VFB (V) 2 Dropout Voltage (VCNTL=5V) 600 700 500 1.5 IOUT (A) 0.800 0.795 0.790 VCNTL=5V, VIN=1.8V, VOUT=1.2V, IOUT=10mA 0.785 0.780 1.2 1 0.8 0.6 0.4 VCNTL=5V, VIN=1.8V, VOUT=1.2V, IOUT=0A 0.2 0 -40℃ -20℃ 0℃ 25℃ 50℃ 75℃ 100℃ 125℃ Temperature (℃) -40℃ -20℃ 0℃ 25℃ 50℃ 75℃ 100℃ 125℃ Temperature (℃) 7 Advanced Power Electronics Corp. APE8903B TYPICAL PERFORMANCE CHARACTERISTICS Temperature VS Enable Threshold Voltage Temperature VS VCNTL POR Threshold 3.0 1.4 1.2 VENH 1 0.8 VENL 0.6 0.4 0.2 VCNTL=5V 0 -40℃ -20℃ 0℃ 25℃ 50℃ 75℃ 100℃ 125℃ Temperature (℃) VCNTL POR Threshold Voltage (V) Enable Threshold Voltage (V) 1.6 2.9 Rising 2.8 2.7 2.6 2.5 2.4 2.3 Falling 2.2 2.1 2.0 -40℃ -20℃ 0℃ 25℃ 50℃ 75℃ 100℃ 125℃ Temperature (℃) Line Transient Line Transient Load Transient VCNTL Power –ON 8 Advanced Power Electronics Corp. APE8903B TYPICAL PERFORMANCE CHARACTERISTICS VIN Power –ON Enable –ON with POK Delay 9 ADVANCED POWER ELECTRONICS CORP. Package Outline : ESOP-8 P Millimeters Q SYMBOLS MIN A2 MAX A 5.80 6.00 6.20 B 4.80 4.90 5.00 C 3.80 3.90 4.00 D 0° 4° 8° E 0.40 0.65 0.90 F 0.19 0.22 0.25 M 0.00 0.08 0.15 H 0.35 0.42 0.49 L 1.35 1.55 1.75 0.375 REF. J B NOM K 45° G 1.27 TYP. P 2.15 2.25 2.35 Q 2.15 2.25 2.35 L I J 1.All Dimension Are In Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : ESOP-8 Part Number Package Code EN Function 8903BMP-X YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence Draw No. M1-MP-8-G-v01