Advanced Power Electronics Corp. APE8973 3A ULTRA LOW DROPOUT LINEAR REGULATOR FEATURES DESCRIPTION The APE8973 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 APE8973 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 APE8973 can be enabled by other power system. Pulling and holding the EN pin below 0.3V shuts off the output. The APE8973 is available in ESOP-8 and DFN 3x310L packages which features small size as an Exposed Pad to reduce the junction-to-case resistance, being applicable in 2~3W applications. Ultra Low Dropout - 0.23V(typical) at 3A 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 3x3-10L Pb-Free Package. TYPICAL APPLICATION 1.Using an Output Capacitor with ESR > 20mΩ R3 1K U1 VCNTL=5V VIN=1.5V VIN VCNTL C2 VOUT POK ON C1 OFF 100uF 0.1uF VOUT EN GND 1uF C3 FB Vout=1.2V/3A APE8973 R1 1K C6 12~48nF R2 2K 2.Using an MLCC as the Output Capacitor ESOP- 8 VCNTL ON POK EN C1 1uF OFF 0.1u VIN=1.5V VIN C3 10uF VOUT VOUT Vout=1.2V/3A GND FB APE8973MP VOUT=VFB*(1+R1/R2) VFB = 0.8V Data and specifications subject to change without notice C5 220uF R3 10K U2 VCNTL=5V C4 R1 39K C6 56pF C5 10uF R2 78K 1 201005311 Advanced Power Electronics Corp. APE8973 TYPICAL APPLICATION 2.Using an MLCC as the Output Capacitor DFN 3x3-10L R3 10K U2 VCNTL=5V VIN VCNTL POK ON EN C1 1uF VIN=1.5V VIN C3 10uF VOUT VOUT Vout=1.2V/3A OFF GND FB R1 39K APE8973GN3 VOUT=VFB*(1+R1/R2) VFB = 0.8V C6 56pF C5 10uF R2 78K ABSOLUTE MAXIMUM RATINGS (at TA=25°C) VCNTL Supply Voltage(VCNTL) -------------------------- -0.3V to 7V VIN Supply Voltage(VIN) ---------------------------------- -0.3V to 7V EN and FB Pin Voltage(VI/O) ---------------------------- -0.3V to VCNTL+0.3V Power Good Voltage(VPOK) ------------------------------ -0.3V to 7V Power Dissipation(PD) ------------------------------------- 3W Storage Temperature Range(TST) --------------------- -65°C to +150°C Junction Temperature Range(T J) ---------------------- -40°C To 150°C Operating Temperature Range (T OP) ------------------ -40°C to +85°C Thermal Resistance from Junction to Case(Rth JC) 15°C/W Thermal Resistance from Junction to Ambient(RthJA) 40°C/W RECOMMENDED OPERATING CONDITIONS VCNTL Supply Voltage(VCNTL) -------------------------- 3V to 6V VIN Supply Voltage(VIN) ---------------------------------- 1.2V to 6V Output Voltage(VOUT) -------------------------------------- 0.8V to VIN-VDROP (VCNTL - VOUT > 1.4V) Output Current(IOUT) --------------------------------------- 0 to 3A Note: RthJA is measured with the PCB copper area (need connect to Expose-Pad) of approximately 1.5 in 2 (Multi-layer) ORDERING/PACKAGE INFORMATION APE8973X Package Type MP : ESOP-8 GN3 : DFN 3x3-10L ( Top View ) GND 1 FB 2 VOUT 3 VOUT 4 8 EN Exposed Pad 7 POK 6 VCNTL 5 VIN VIN 1 VIN 2 VCNTL 3 (GND) 10 NC 9 VOUT 8 POK 4 7 VOUT FB EN 5 6 GND DFN 3x3-10L ESOP-8 2 Advanced Power Electronics Corp. APE8973 ELECTRICAL SPECIFICATIONS (VCNTL = 5V, VIN = 1.5V, VOUT = 1.2V, TA=25°C unless otherwise specified) Parameter SYM MIN TYP MAX UNITS VCNTL POR Threshold VCNTL 2.5 2.7 2.9 V VCNTL POR Hysteresis VCNTL(hys) - 0.4 - V VIN POR Threshold VIN 0.8 0.9 1 V VIN POR Hysteresis VIN(hys) - 0.5 - V TEST CONDITION EN= VCNTL - 1 1.8 mA VCNTL Shuntdown Current ISD EN= 0V - 50 100 uA Feedback Voltage VFB VCNTL=3.0 ~ 6.0V, IOUT=10mA 0.784 0.8 0.816 V % VCNTL Nominal Supply Current ICNTL IOUT=0A ~ 3A Load Regulation VDROP Dropout Voltage VOUT Pull Low Resistance IOUT = 3A, VCNTL=5V - 0.06 0.25 1.2V＜VOUT＜2.0V - 0.23 0.3 2.0V≦VOUT＜2.8V - 0.26 0.33 2.8V≦VOUT＜3.6V V - 0.5 1 EN=0V - 85 - Ω ms Soft Start Time TSS - 2 4 EN Pin Logic High Threshold Voltage VENH Enable 1.2 - - VENL Disable - - 0.4 - 50 - mV - 10 - uA 3.3 - - A - 65 - - 65 - VFB Falling - 0.4 - V EN Hysteresis EN Pin Pull-Up Current IEN ILIM Current Limit Ripple Rejection VIN VCNTL PSRR Under-Voltage Threshold EN=GND VCNTL=3.0~6.0V TJ= -40 ~ 125°C F=120Hz, IOUT=100mA 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 POK Low Voltage POK Delay Time Thermal Shutdown Temp POK sinks 5mA TDELAY TSD Thermal Shutdown Hysteresis - 0.25 0.4 V 0.8 2 4 ms - 160 - - 50 - °C PIN DESCRIPTIONS PIN SYMBOL GND FB PIN DESCRIPTION GND Pin Feedback Pin Internal Pull High. EN EN=High or Floating à Enable EN=Low à Shutdown mode VOUT POK VCNTL VCC EP Output Voltage pin Power OK Output Pin CNTL Pin Input Voltage Input Voltage Connect to VIN or GND 3 Advanced Power Electronics Corp. APE8973 BLOCK DIAGRAM N-MOSFET VIN VCNTL EN Current Limit Power -ON Reset Enable Soft-Start And Control Logic VOUT Error Amp - + Bandgap UV + FB 0.4V + Thermal Shutdown Delay POK - GND 92% Vref POK FUNCTION 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: VOUT = 0.8 x (1 + R1/R2) 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 Power-On 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 re-enabled, the IC undergoes a new soft-start cycle. Left this pin open, this pin is internal pulled up to VCNTL voltage, enabling the regulator. VOUT Output of the regulator. Please connect Pin 3 and Pin 4 using wide tracks. It is necessary to connect an output capacitor with this pin for closed-loop compensation and improving transient responses. 4 Advanced Power Electronics Corp. APE8973 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. Current Limit The APE8973 monitors the current via the output NMOS and limits the maximum current to prevent load and APE8973 from damages during overload or short circuit conditions. 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. Under Voltage Protection (UVP) The APE8973 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 APE8973 starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8973. 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. The thermal shutdown designed. 5 Advanced Power Electronics Corp. APE8973 VCNTL VS ICNTL 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 VCNTL VS VFB VFB (V) I CNT L (mA) TYPICAL PERFORMANCE CHARACTERISTICS IOUT=0A 3 3.5 4 4.5 VCNTL (V) 5 0.810 0.808 0.806 0.804 0.802 0.800 0.798 0.796 0.794 0.792 0.790 3 5.5 3.5 0.805 VFB(V) V O U T (V ) 0.810 0.800 0.795 VCNTL=5V, VIN=1.5V 0.785 0.5 1 1.5 5 5.5 Temperaute VS VFB 0.815 0 4.5 VCNTL (V) IOUT VS VOUT 0.790 4 2 2.5 3 IOUT (A) 0.85 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 -40 -25 0 25 50 75 100 125 Temperature(℃) ICNTL(m A) Temperaute VS ICNTL 2.00 1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -40 -25 0 25 50 75 100 125 Temperature(℃) 6 Advanced Power Electronics Corp. APE8973 TYPICAL PERFORMANCE CHARACTERISTICS Enable-ON Power OK Wave Output Discharge Load Transient 7 ADVANCED POWER ELECTRONICS CORP. Package Outline : ESOP-8 Millimeters P MIN NOM 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° Q SYMBOLS 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 A2 K 45° G 1.27 TYP. P 3.15 3.25 3.35 Q 2.25 2.35 2.45 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 8973MP YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence Advanced Power Electronics Corp. APE8973 (2) DFN 3x3-10L (Top View) (Bottom View) b 10 D D1 10 L Pin 1 Indent 1 1 e E e1 E1 A1 A3 A 0.10 C Symbol SEATING PLANE y Dimensions In Millimeters Dimensions In Inches Min. Nom. Max. Min. Nom. Max. A - - 0.90 - - 0.036 A1 0.00 0.02 0.05 0.000 0.001 0.002 A3 0.20 REF. 0.008 REF. b 0.18 0.25 0.30 0.007 0.010 0.012 D 2.90 3.00 3.10 0.114 0.118 0.122 D1 1.10 1.20 1.30 0.043 0.047 0.051 E 2.90 3.00 3.10 0.114 0.118 0.122 E1 2.10 2.20 2.30 0.083 0.087 0.091 L 0.45 0.55 0.65 0.018 0.022 0.026 e 0.50 BSC. 0.020 BSC. e1 2.00 BSC. 0.079 BSC. y 0.00 - 0.08 0.000 - 0.003 Part Number 8973 YWWS Date Code (YWWS) Y：Last Digit Of The Year WW ：Week S ：Sequence