AME Low Dropout 3A CMOS Regulator AME8846 n General Description The AME8846A/B family of positive CMOS linear regulators provides ultra low-dropout voltage (210mV @3A) and low quiescent current (typically 600uA), thus making them ideal for power-saving system. These rugged devices have both Thermal Shutdown and Current limit to prevent device failure under the "Worst" of operating conditions. The AME8846A/B also provides SS time in order to reduce inrush current in different applications. n Typical Application VOUT = 0.8 x R1+R2 R2 VOUT VIN IN 10µF R1 AME8846 10µF ADJ Chip Enable VCNTL OUT EN R2 VCNTL GND 1µF PG 100K VOUT n Features l l l l l l l l l l Low Dropout Voltage: 210mV @3A, 25oC Adjustable Output Voltage (0.8V to 3.3V) High Output Accuracy +1.5% Support Low ESR Multi-layer ceramic capacitors (MLCC) Application Power Good Output Fast Transient Response Soft-Start Function Over-Temperature Shutdown with Hysteresis Current Limiting and Short Current Limit Protection Green Products Meet RoHS Standards n Functional Block Diagram IN OUT OCP Driver Error Amplifier OTP EN ADJ POR 0.8V PG 0.72V GND VCNTL n Applications l Motherboard Application l Notebook Application l Front Side Bus VTT(1.2V/3A) Rev. A.03 1 AME Low Dropout 3A CMOS Regulator AME8846 n Pin Configuration DFN-10B (3mmx3mmx0.75mm) Top View SOP-8/PP Top View 7 8 6 AME8846x-xxxADJ 1. PG 2. EN 3. IN 4. VCNTL 5. NC 6. OUT 7. ADJ 8. GND 5 AME8846 1 2 3 4 10 9 8 7 6 AME8846 1 2 3 4 5 Note: Connect exposed pad (heat sink on the back) to GND. AME8846x-xxxADJ 1. OUT 2. OUT 3. OUT 4. ADJ 5. PG 6. EN 7. IN 8. IN 9. IN 10. VCNTL n Pin Configuration Pin Number SOP-8/PP DFN-10B Pin Description 1 5 PG Power Good Open Drain Output. 2 6 EN Enable Input (Active-High). 3 7, 8, 9 IN Input Voltage. 4 10 VCNTL 5 N/A NC 6 1, 2, 3 OUT 7 4 ADJ 8 2 Pin Name 11 GND Control Input Voltage. No Internal Connection. Output Voltage. Set the outpot voltage by the external feedback resistors. VOUT = 0.8V × (R1 + R 2 ) R2 Ground. Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Ordering Information AME8846x - x x x xxx Output Voltage Number of Pins Package Type Pin Configuration Enable Pin Function Enable Pin Function A: Internal Pull High B: Internal Pull Low Pin Configuration A (SOP-8/PP) A (DFN-10B) Rev. A.03 1. 2. 3. 4. 5. 6. 7. 8. PG EN IN VCNTL NC OUT ADJ GND Package Type Number of Pins V: DFN Z: SOP/PP A: 8 B: 10 Output Voltage ADJ: Adjustable 1. OUT 2. OUT 3. OUT 4. ADJ 5. PG 6. EN 7. IN 8. IN 9. IN 10. VCNTL 3 AME Low Dropout 3A CMOS Regulator AME8846 n Absolute Maximum Ratings Parameter Maximum Control Input Voltage, VCNTL 3 to 6 Power Input Voltage, VIN 1 to 6 GND-0.3 to VIN+0.3 Output Voltage, VOUT Unit V -0.3 to VCNTL +0.3 Other Pins Electrostatic Discharge (HBM) 1500 Electrostatic Discharge (MM) 200 Electrostatic Discharge (CDM) 1000 Junction Temperature 150 Storage Temperature Range V V o -65 to +150 C n Recommended Operating Conditions Parameter 4 Symbol Rating Unit Power Input Voltage VIN 1 to 5.5 V Control Input Voltage VCNTL 3V to 5.5 V Ambient Temperature Range TA - 40 to +85 o C Junction Temperature Range TJ - 40 to +125 o C Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Thermal Information Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Power Dissipation Package Die Attach SOP-8/PP θJC DFN-10B SOP-8/PP Symbol Conductive Epoxy DFN-10B SOP-8/PP DFN-10B Lead Temperature (Soldering 10 Sec)** θJA PD Maximum Unit 19 8.5 84 o C/W 65 1450 mW 1540 260 o C * Measure θJC on backside center of Exposed Pad. ** MIL-STD-202G210F Rev. A.03 5 AME Low Dropout 3A CMOS Regulator AME8846 n Electrical Specifications VIN=VOUT(NOM) +0.5V, VCNTL=VEN=5V, IOUT=1mA, and COUT=10µF, CIN=10µF, unless otherwise noted. Typical values are at TA=25oC. Parameter Symbol Test Condition Min Typ Max Units Supply Input Voltage Power Input Voltage Range VIN 1 5.5 Control Input Voltage Range VCNTL 3 5.5 POR Threshold 2.7 POR Hysteresis 0.2 VCNTL=5.5V Quiescent Current 0.6 1.2 0.8 0.812 V mA Feedback Voltage VADJ Reference Voltage VCNTL=5V, VIN=3.3V Dual Power Output Voltage Range Power Input Line Regulation Load Regulation VIN-VDROP 0.8 V ∆VLINE_IN 1.2V<VIN<4.5V VCNTL=VEN=5V IOUT=0A, VOUT=VADJ 0.01 0.1 %/V ∆VLOAD IOUT=0A~3A 0.8 1.5 %A IOUT=2A, VCNTL=VEN=5.0V VOUT=VADJ 200 250 IOUT=3A, VCNTL=VEN=5.0V VOUT=VADJ 210 EN=Low 150 VDROP Dropout Voltage 0.788 VOUT Discharge RDS(ON) mV 350 Ω Enable EN Pin Voltage High VENH EN Pin Voltage Low VENL Soft Start Time 6 0.8 IEN VCNTL=VEN=5V 10 12 AME8846A ISHDN VEN=0V 5 10 AME8846B ISHDN VEN=0V 0.1 1 1.4 3 EN Input Current Control Input Current in Shutdown 1.4 V µA ms Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Electrical Specifications (Contd.) Parameter Symbol Test Condition Min Typ Max Units Power Good and Delay PG Threshold Voltage for Power Good VFB Rising 90 PG Threshold Voltage for Power Not Good VFB Falling 80 PG sinks 5mA 0.35 0.7 V 1.5 3 5 mS 3.1 4.5 7 0.5 1.5 3 % PG Low Voltage PG Delay Time Protection Function Current Limit ILIM Short Circuit Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis VOUT<0.3V TSD 160 ∆TSD 30 A o C Note 1. Quiescent Current is defined by IQ=IIN-IOUT(IOUT=0mA) Rev. A.03 7 AME AME8846 n Detailed Description The AME8846A/B family of positive CMOS linear regulators provides ultra low-dropout voltage, high output current with low ground current, very low input voltage and very low dropout voltage at up to 3A. It operates with a VIN as low as 1V and VCNTL voltage 3V with output voltage programmable as low as 0.8V. Enable The AME8846A/B has a dedicated enable pin, when this pin is in the logic low condition, the MOS pass transistor shuts off, and all internal circuits are powered down. For AME8846A, the EN pin is pulled up by an internal resistor to enable normal operation. So the regulator will be turn on when EN pin is floating. It is not necessary to use an external pull up resistor to save cost. For AME8846B, the EN pin is pulled low by an internal resistor to enable normal operation. So the regulator will be turn off when EN pin is floating. It is not necessary to use an external pull low resistor to save cost. Low Dropout 3A CMOS Regulator Short Circuit Current-Limit The short circuit current-limit function reduces the current-limit level down to 1.5A (typical) when short circuit conditions. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of AME8846A/B. When the junction temperature exceeds 160oC, the over-temperature protection circuit turns off the pass transistor allowing the device to cool down, The pass transistor turns on again after the junction temperature cools by 30oC. Power Good and Delay The power good function is an open-drain output. Connects a 100kΩ pull up resistor to VOUT to obtain an output voltage. The PG pin will go high 3mS (typ) after the output voltage arrives at 90% of normal output voltage. Soft-Start The AME8846A/B features a soft start function that limits inrush current. The soft start time is typically 1.4ms. Current-Limit The AME8846A/B contains an independent current limit and short circuit current protection to prevent damage during fault conditions. The current limit monitors and controls the pass transistor's gate voltage, limiting the output current to higher than 4.5A typical. 8 Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Application Information Power Dissipation The power dissipation is defined as Input Capacitor The input capacitance is at least 10µF located as close as possible to the IC is recommended. Output Capacitor The AME8846A/B is stable with an output capacitor to ground of 10uF or greater. The output capacitor selection is dependent on ESR (equivalent series resistance) and capacitance of the output capacitor over the desired operating temperature. The Ultra-low-ESR capacitors (such as ceramic chip capacitors) and low-ESR bulk capacitors (such as solid tantalum, POSCap, and Aluminum electrolytic capacitors) can all be used as output capacitors. For applications with large load current transitions, low-ESR bulk capacitors are normally recommended. Decoupling ceramic capacitors must be placed as close as possible to the load and ground pins. The impedance of the layout must be minimized. PD=(VIN-VOUT) x IOUT + VIN x IQ The maximum power dissipation depends on the thermal resistance of IC package, PCB material & PCB design (The copper area of pad), the rate of surrounding airflow and temperature difference between junction and ambient. The maximum power dissipation can be calculated by the following formula: PD ( MAX ) = (TJ − TA ) θ JA Note: Operation junction temperature not exceed 125oC Setting Output Voltage The output voltage is programmed by the resistor divider connected to the FB pin. The output voltage is given by the following equation: VOUT = 0.8V × (R1 + R 2) R2 The feedback resistor of resistance value support > 100K ohm and no require forward capacitor. Rev. A.03 9 AME Low Dropout 3A CMOS Regulator AME8846 n Characterization Curve Load Transient Response Load Transient Response VCNTL=5V , VIN=1.8V, V OUT=1.2V VCNTL=5V , VIN=1.8V, V OUT=1.2V VOUT VOUT (20mV/Div) (20mV/Div) IOUT (1A/Div) IOUT (1A/Div) Time (2ms/Div) Time (2ms/Div) VIN Line Transient Response VIN Line Transient Response VCNTL=5V, VOUT =1.2V,IOUT=0A VCNTL=5V, VOUT =1.2V,IOUT =2A V IN V IN (1V/Div) (1V/Div) V OUT V OUT (20mV/Div) (20mV/Div) Time(500µ µ s/Div) Time(500µ µ s/Div) VCNTL Line Transient Response VCNTL Line Transient Response VIN=1.8V, V OUT=1.2V, IOUT =0A VIN=1.8V, V OUT=1.2V, IOUT =2A VCNTL (1V/Div) VCNTL (1V/Div) V OUT (20mV/Div) V OUT (20mV/Div) Time(2ms/Div) 10 Time(2ms/Div) Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Characterization Curve (Contd.) Start Up form Enable Start Up form VCNTL IOUT=3A EN VCNTL (5V/Div) (5V/Div) V OUT VOUT (1V/Div) (1V/Div) PG PG (1V/Div) (1V/Div) IIN IIN (2A/Div) (2A/Div) IOUT =3A Time (1ms/Div) Time (2ms/Div) Start Up form VIN Short Circuit Protection VCNTL=5V , V IN=1.8V, VOUT=1.2V IOUT =3A VIN (1V/Div) VOUT (1V/Div) PG (1V/Div) IOUT IIN (1A/Div) (2A/Div) Time(100µ µ s/Div) Over Current Protection Dropout Voltage vs Load Current & Temperature 200 VCNTL=5V,VIN=3.3V 2.5 Dropout Voltage (mV) Output Votlage VOUT(V) 3.0 Time (2ms/Div) 2.0 1.5 1.0 0.5 125oC 150 o 25 C 125 100 75 o -40 C 50 25 0 0 0.5 1.0 1.5 2.0 2.5 3.0 Load Current IOUT(A) Rev. A.03 VCNTL=5V,VOUT=1.2V 175 3.5 4.0 0 0 0.3 0.6 0.9 1.2 1.5 1. 8 2.1 2. 4 2.7 3.0 Load Current IOUT(A) 11 AME Low Dropout 3A CMOS Regulator AME8846 n Characterization Curve (Contd.) Short Circuit Current vs. Temperature Output Voltage vs. Temperature 1.25 VCNTL=5V , V IN=1.8V, VOUT=1.2V 2.2 VCNTL=5V , VIN=1.8V, VOUT =1.2V 1.23 Output Voltage (V) Short Circuit Current (A) 2.4 2.0 1.8 1.6 1.4 1.2 1.0 -40 -20 0 +20 +40 +60 +80 1.21 1.19 1.17 1.15 -40 +100 -25 -10 Temperature (oC) +20 +35 +50 +65 +80 +95 +110 +125 Temperature (oC) Quiescent Current vs. Temperature VCNTL POR Threshold Voltage vs. Temperature 1.0 2.90 VCNTL=5V , VIN=1.8V, VOUT =1.2V 2.85 0.9 VIN=1.8V, VOUT=1.2V 2.80 POR Voltage (V) Quiescent Current (mA) +5 0.8 0.7 0.6 0.5 Rising 2.75 2.70 2.65 2.60 Falling 2.55 2.50 2.45 0.4 -40 -25 -10 +5 +20 +35 +50 +65 +80 +95 +110 +125 Temperature ( C) 2.40 -40 -25 -10 +5 +20 +35 +50 +65 +80 +95 +110 +125 Temperature (oC) o VCNTL Standby Current vs. Temperature VCNTL Standby Current (µA) 7.0 5.0 4.0 AME8846A 3.0 2.0 AME8846B 1.0 0.0 -1.0 -2.0 -50 12 VCNTL=5V , VIN=1.8V, VOUT =1.2V 6.0 -25 0 +25 +50 +75 Temperature (oC) +100 +125 Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Tape and Reel Dimension SOP-8/PP P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size DFN-10B (3mmx3mmx0.75mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size Rev. A.03 P ackage C arrie r Width (W) P itch (P ) P art P e r Full R e e l R e e l S iz e D FN-10B (3x3x0.75m m ) 12.0±0.1 m m 4.0±0.1 m m 3000pc s 330±1 m m 13 AME Low Dropout 3A CMOS Regulator AME8846 n Package Dimension SOP-8/PP TOP VIEW SIDE VIEW D1 E1 E2 E L1 C PIN 1 D e 14 A1 FRONT VIEW A A2 b SYMBOLS MILLIMETERS INCHES MIN MAX MIN MAX A 1.350 1.750 0.053 0.069 A1 0.000 0.250 0.000 0.010 A2 1.250 1.650 0.049 0.065 C 0.100 0.250 0.004 0.010 E 3.750 4.150 0.148 0.163 E1 5.700 6.300 0.224 0.248 L1 0.300 1.270 0.012 0.050 b 0.310 0.510 0.012 0.020 D 4.720 5.120 0.186 0.202 1.270 BSC e 0.050 BSC θ 0 E2 2.050 2.513 0.081 0.099 D1 2.150 3.402 0.085 0.134 o 8 o 0 o 8o Rev. A.03 AME Low Dropout 3A CMOS Regulator AME8846 n Package Dimension DFN-10B (3mmx3mmx0.75mm) TOP VIEW BOTTOM VIEW e D L E E1 PIN 1 IDE NTIFICATION b D1 A G1 G REAR VIEW SYMBOLS Rev. A.03 MILLIMETERS INCHES MIN MAX MIN MAX A 0.700 0.800 0.028 0.031 D 2.900 3.100 0.114 0.122 E 2.900 3.100 0.114 0.122 e 0.450 0.550 0.018 0.022 D1 2.300 2.500 0.091 0.098 E1 1.600 1.800 0.063 0.071 b 0.180 0.300 0.007 0.012 L 0.300 0.500 0.012 0.020 G 0.153 0.253 0.006 0.010 G1 0.000 0.050 0.000 0.002 15 www.ame.com.tw E-Mail: [email protected] Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. AME, Inc. , July 2013 Document: A001A-DS8846-A.03 Corporate Headquarter AME, Inc. 8F, 12, WenHu St., Nei-Hu Taipei 114, Taiwan . Tel: 886 2 2627-8687 Fax: 886 2 2659-2989