AAT3110IJS-5-T1

AAT3110 MicroPower™ Regulated Charge Pump General Description The AAT3110 ChargePump™ is a MicroPower switched-capacitor voltage converter that delivers a regulated output. No external inductor is required for operation. Using three small capacitors, the AAT3110 can deliver up to 150mA to the voltage regulated output. The AAT3110 features very low quiescent current and high efficiency over a large portion of its load range making this device ideal for battery-powered applications. Furthermore, the combination of few external components and small package size keeps the total converter board area to a minimum in space restricted applications. The AAT3110 operates in an output-regulated voltage doubling mode. The regulator uses a pulse-skipping technique to provide a regulated output from a varying input supply. The AAT3110 contains a thermal management circuit to protect the device under continuous output short circuit conditions. The AAT3110 is available in a surface mount 6-pin SOT23 or 8-pin SC70JW package and is rated from -40 to 85°C. The AAT3110 ChargePump™ is a member of AnalogicTech's Total Power Management IC product family. Features • • ChargePump™ • • • • • • • • • Step-up type voltage converter Input Range • AAT3110-5: 2.7V to 5V • AAT3110-3.3: 2.3V to 3.3V MicroPower consumption: 13µA 5V, 3.3V Regulated ±4% output 5V Output Current • 100mA with VIN ≥ 3.0V • 50mA with VIN ≥ 2.7V 3.3V Output Current • 150mA with VIN ≥ 2.7V • 100mA with VIN ≥ 2.3V High Frequency 750 kHz operation Shutdown mode draws less than 1µA Short-circuit/over-temperature protection 2kV ESD Rating SC70JW-8 or SOT23-6 package Preliminary Information Applications • • • • • • • Cellular Phones Portable Communication Devices Handheld Electronics Digital Cameras PDAs Battery Back Up Supplies LED/Display Back Light Driver Typical Operating Circuits AAT3110 VOUT COUT VOUT C+ 1uF 10uF GND VIN CCIN VIN ON/OFF SHDN 10uF 3110.2001.9.0.92 1 AAT3110 MicroPower™ Regulated Charge Pump Pin Descriptions Pin # SOT-23-6 SC70JW-8 Symbol VOUT GND SHDN CVIN C+ Function Regulated output pin. Bypass this pin to ground with at least 6.8µF low ESR capacitor Ground connection Shutdown input. Active low signal disables the converter. Flying capacitor negative terminal Input supply pin. Bypass this pin to ground with at least 6.8µF low ESR capacitor Flying capacitor positive terminal 1 2 3 4 5 6 1 2, 3, 4 5 6 7 8 Pin Configuration SOT23-6 SC70JW-8 6 VOUT GND SHDN 1 C+ VIN C- 2 5 3 4 VOUT GND GND GND 1 2 8 7 3 4 6 5 C+ VIN CSHDN 1 1 2 2 2 3110.2001.9.0.92 AAT3110 MicroPower™ Regulated Charge Pump Absolute Maximum Ratings Symbol VIN VOUT VSHDN tSC TJ TLEAD VESD (TA=25°C unless otherwise noted) Value -0.3 to 6 -0.3 to 6 -0.3 to 6 Indefinite -40 to 150 300 2000 Description VIN to GND VOUT to GND SHDN to GND Output to GND Short-Circuit Duration Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec) ESD Rating1 — HBM Units V V V s °C °C V Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time. Note 1: Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Thermal Information Symbol ΘJA PD Description Maximum Thermal Resistance (SOT23-6 or SC70JW-8) Maximum Power Dissipation (SOT23-6 or SC70JW-8) Rating 150 667 Units °C/W mW Note 2: Mounted on an FR4 board. Electrical Characteristics (TA = -40 to 85°C unless otherwise noted. CFLY=1µF, CIN=10µF, COUT=10µF) AAT3110-5 Symbol VIN IQ VOUT ISHDN VRIPPLE η fOSC VIH VIL IIH IIL tON ISC Typical values are at TA=25°C, Description Input Voltage No Load Supply Current Output Voltage Shutdown Supply Current Ripple Voltage Efficiency Frequency SHDN Input Threshold High SHDN Input Threshold Low SHDN Input Current High SHDN Input Current Low VOUT Turn-on time Short-circuit current3 Conditions VOUT=5.0V 2.7V < VIN < 5V, IOUT=0mA, SHDN=VIN 2.7V < VIN < 5V, IOUT ≤ 50mA 3.0V < VIN < 5V, IOUT ≤ 100mA 2.7V < VIN < 3.6V, IOUT =0mA, VSHDN=0 3.6V < VIN < 5V, IOUT =0mA, VSHDN=0 VIN = 3V, IOUT = 50mA VIN = 3V, IOUT = 100mA VIN = 3V, IOUT = 50mA Oscillator Free Running Min 2.7 4.8 4.8 Typ 13 5 5 0.01 25 30 83 750 Max VOUT 30 5.2 5.2 1 2.5 Units V µA V V µA mVP-P % kHz V V µA µA ms mA 1.4 SHDN = VIN SHDN = GND VIN = 3V, IOUT = 0mA VIN = 3V, VOUT = GND, SHDN = 3V -1 -1 0.2 300 0.3 1 1 Note 3: Under short-circuit conditions, the device may enter overtemperature protection mode. 3110.2001.9.0.92 3 AAT3110 MicroPower™ Regulated Charge Pump Electrical Characteristics (TA = -40 to 85°C unless otherwise noted. CFLY=1µF, CIN=10µF, COUT=10µF) AAT3110-3.3 Symbol VIN IQ VOUT ISHDN VRIPPLE η fOSC VIH VIL IIH IIL tON ISC Typical values are at TA=25°C, Description Input Voltage No Load Supply Current Output Voltage Shutdown Supply Current Ripple Voltage Efficiency Frequency SHDN Input Threshold High SHDN Input Threshold Low SHDN Input Current High SHDN Input Current Low VOUT Turn-on time Short-circuit current Conditions VOUT=3.3V 2.3V < VIN < 3.3V, IOUT=0mA 2.3V < VIN < 3.3V, IOUT=50mA 2.5V < VIN < 3.3V, IOUT=100mA 2.3V < VIN < 3.3V, IOUT =0mA, VSHDN=0 VIN = 2.3V, IOUT = 50mA VIN = 2.3V, IOUT = 25mA Oscillator Free Running Min 2.3 3.17 3.17 Typ 10 3.30 3.30 0.01 20 71 750 Max VOUT 30 3.43 3.43 1 Units V µA V V µA mVP-P % kHz V V µA µA ms mA 1.4 SHDN = VIN SHDN = GND VIN = 3V, IOUT = 0mA VIN = 3V, VOUT = GND, SHDN = 3V -1 -1 0.2 300 0.3 1 1 4 3110.2001.9.0.92 AAT3110 MicroPower™ Regulated Charge Pump Typical Characteristics—AAT3110-5 (Unless otherwise noted, VIN = 3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC) Output Voltage vs. Output Current AAT3110-5 5.15 24 5.1 5.05 5 4.95 4.9 4.85 4.8 0 50 100 150 Supply Current vs. Supply Voltage AAT3110-5 Supply Current (µA) IOUT=0 A CFLY=1µF VSHDN=VIN Output Voltage (V) VIN=3.6 22 20 18 16 14 12 10 2.5 VIN=3.0 VIN=2.7 VIN=3.3 3 3.5 4 4.5 5 5.5 Output Current (mA) Supply Voltage (V) Supply Current vs VSHDN AAT3110-5 30 25 20 95% Efficiency vs. Supply Voltage AAT3110-5 IOUT=0µA Efficiency (%) 90% 85% 80% 75% 70% 65% 60% 55% 50% 45% 2.70 3.00 3.50 4.00 4.50 5.00 25 mA VIN=5.5V Supply Current (µA) VIN=3.3V 15 10 5 0 0 1 2 3 4 5 50 mA 100 mA VIN=2.8V Supply Voltage (V) VSHDN Control Voltage (V) Efficiency vs. Load Current AAT3110-5 Oscillator Frequency (kHz) 100% 90% 80% Oscillator Frequency vs. Supply Voltage AAT3110-5 1200 1100 1000 900 800 700 600 500 400 2.7 VIN = 2.7V Efficiency (%) - 40º C 70% 60% 50% 40% 30% 20% 10% 0% 0.01 0.1 1 10 100 1000 VIN = 3.6V VIN = 3.3V VIN = 3.0V 25º C 85º C 3.0 3.5 4.0 4.5 5.0 Load Current (mA) Supply Voltage (V) 3110.2001.9.0.92 5 AAT3110 MicroPower™ Regulated Charge Pump Typical Characteristics—AAT3110-5 (Unless otherwise noted, VIN = 3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC) Startup Time with 50 mA Load AAT3110-5 SHDN 2V/DIV SHDN 2V/DIV Startup Time with 100 mA Load AAT3110-5 VOUT 1V/DIV VOUT 1V/DIV 50µS/DIV 50µS/DIV Load Transient Response for 50mA AAT3110-5 IOUT 0mA to 50mA 20mA/DIV VIN=3.0V VOUT AC COUPLED 20mV/DIV 50µS/DIV VOUT AC COUPLED 20mV/DIV IOUT 0mA to 100 mA 50mA/DIV Load Transient Response for 100mA AAT3110-5 VIN=3.0V 50µS/DIV Output Ripple with IOUT=50 mA AAT3110-5 Output Ripple with IOUT=100 mA AAT3110-5 VOUT AC Coupled 10 mV/DIV VOUT AC Coupled 10 mV/DIV VIN=3.0V 2µS/DIV VIN=3.0V 2µS/DIV 6 3110.2001.9.0.92 AAT3110 MicroPower™ Regulated Charge Pump Typical Characteristics—AAT3110-5 (Unless otherwise noted, VIN = 3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC) VIN vs. VIH 1.00 0.95 0.90 0.85 1.00 VIN vs. VIL 0.95 0.90 0.85 -40°C -40°C 25°C VIH (V) VIL (V) 85°C 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0 25°C 0.80 0.75 0.70 0.65 0.60 0.55 85°C 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VIN (V) VIN (V) Normalized Output Voltage (%) VSHDN Threshold vs. Supply Voltage AAT3110-5 1.00 0.95 Normalized Output Voltage vs Temperature 1.20% 1.00% 0.80% 0.60% 0.40% 0.20% 0.00% -0.20% -0.40% -0.60% -50 -25 0 25 50 75 100 125 IOUT=25mA VSHDN Threshold (V) 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VIH VIL Temperature (C) VIN ( V) 3110.2001.9.0.92 7 AAT3110 MicroPower™ Regulated Charge Pump Typical Characteristics—AAT3110-3.3 (Unless otherwise noted, VIN = 2.3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC) Output Voltage vs. Output Current AAT3110-3.3 3.4 24 3.35 3.3 3.25 3.2 Supply Current vs. Supply Voltage AAT3110-3.3 Supply Current (µA) IOUT=0 A CFLY=1µF VSHDN=VIN Output Voltage (V) VIN=3V VIN=2.7V 22 20 18 16 14 12 10 VIN=2.3V 3.15 3.1 0 50 100 150 200 2.3 2.5 2.7 2.9 3.1 3.3 Output Current (mA) Supply Voltage (V) Supply Current vs VSHDN AAT3110-3.3 30 Efficiency vs. Supply Voltage AAT3110-3.3 IOUT=0µA 80 70 Supply Current (µA) 25 Efficiency (%) 20 60 50 40 30 20 10 0 2 2.5 3 3.5 VIN=3.3V 15 10 5 0 0 1 2 3 3.3 VIN=2.8V IOUT=100mA VSHDN Control Voltage (V) Supply Voltage (V) Efficiency vs. Output Current AAT3110-3.3 Oscillator Frequency (kHz) 100.0% 90.0% 80.0% 70.0% 60.0% 50.0% 40.0% 30.0% 20.0% 10.0% 0.0% 0.01 Oscillator Frequency vs. Supply Voltage AAT3110-3.3 1200 1100 1000 900 800 700 600 500 400 2.3 2.5 2.7 2.9 3.1 3.3 - 40°C 25°C 85°C VIN=2.25V 0.1 1 10 100 I-Load (mA) Supply Voltage (V) 8 3110.2001.9.0.92 AAT3110 MicroPower™ Regulated Charge Pump Typical Characteristics—AAT3110-3.3 (Unless otherwise noted, VIN = 2.3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC) Startup Time with 50 mA Load AAT3110-3.3 SHDN 2V/DIV SHDN 2V/DIV Startup Time with 100 mA Load AAT3110-3.3 VOUT 1V/DIV 100µS/DIV VOUT 1V/DIV 100µS/DIV Load Transient Response for 50mA AAT3110-3.3 IOUT 0mA to 50mA 20mA/DIV VOUT AC COUPLED 20mV/DIV 20µS/DIV VIN=2.3V COUT=10µF IOUT 0mA to 100mA 50mA/DIV VOUT AC COUPLED 20mV/DIV Load Transient Response for 100mA AAT3110-3.3 VIN=2.3V COUT=10µF 50µS/DIV Output Ripple for 50mA Load AAT3110-3.3 Output Ripple for 100mA Load AAT3110-3.3 VOUT AC Coupled 10mV/DIV VOUT AC Coupled 10mV/DIV VIN=2.3V VIN=2.3V 2µs/DIV 2µs/Div. 3110.2001.9.0.92 9 AAT3110 MicroPower™ Regulated Charge Pump Typical Characteristics—AAT3110-3.3 (Unless otherwise noted, VIN = 2.3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC) VIN vs. VIH AAT3110-3.3 1.00 0.95 0.90 0.85 1.00 0.95 VIN vs. VIL AAT3110-3.3 -40°C 25°C 0.90 0.85 VIH (V) VIL (V) 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0 -40°C 25°C 85°C 85°C 2.2 2.4 2.6 2.8 3.0 3.2 3.3 2.2 2.4 2.6 2.8 3.0 3.2 3.3 VIN (V) VIN (V) VSHDN Threshold vs. Supply Voltage AAT3110-3.3 1.00 VSHDN Threshold (V) 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.3 VIH VIL VIN (V) 10 3110.2001.9.0.92 AAT3110 MicroPower™ Regulated Charge Pump Functional Block Diagram VIN S2 SHDN CONTROL S1 C+ C- VREF S4 S3 VOUT + GND Functional Description Operation (Refer to block diagram) The AAT3110 uses a switched capacitor charge pump to boost an input voltage to a regulated output voltage. Regulation is achieved by sensing the charge pump output voltage through an internal resistor divider network. A switched doubling circuit is enabled when the divided output drops below a preset trip point controlled by an internal comparator. The charge pump switch cycling enables four internal switches at two non-overlapping phases. During the first phase, switches S1 and S4 are switched on (short) and switches S2 and S3 are off (open). The flying capacitor CFLY is charged to a level approximately equal to input voltage VIN. On the second phase, switches S1 and S4 are turned off (open), S2 and S3 are turned on (short). The low side of the flying capacitor CFLY is connected to GND during the first phase. During the second phase, the flying capacitor CFLY is switched so that the low side is connected to VIN. The voltage at the high side of the flying capacitor CFLY is bootstrapped to 2×VIN and connected to output through a switch. For each cycle phase, charge from input node VIN is transported from a lower voltage to a higher voltage. This cycle repeats itself until the output node voltage is high enough to exceed the preset input threshold of the control comparator. When the output voltage exceeds the internal trip point level, the switching cycle stops and the charge pump circuit is tem3110.2001.9.0.92 porarily placed in an idle state. When idle, the AAT3110 has a quiescent current of 13µA or less. The closed loop feed back system containing the voltage sense circuit and control comparator allows the AAT3110 to provide a regulated output voltage to the limits of the input voltage and output load current. The switching signal, which drives the charge pump is created by an integrated oscillator within the control circuit block. The free running charge pump switching frequency is approximately 750kHz. The switching frequency under an active load is a function of VIN, VOUT, COUT and IOUT. For each phase of the switching cycle, the charge transported from VIN to VOUT can be approximated by the following formula: VPHASE ≈ CFLY×(2×VIN-VOUT) The relative average current that the charge pump can supply to the output may be approximated by the following expression: IOUT(AVG) α CFLY×(2×VIN-VOUT)×FSW The AAT3110 has complete output short circuit and thermal protection to safeguard the device under extreme operating conditions. An internal thermal protection circuit senses die temperature and will shut down the device if the internal junction temperature exceeds approximately 145°C. The charge pump will remain disabled until the fault condition is relieved. 11 AAT3110 MicroPower™ Regulated Charge Pump Applications Information External Capacitor Selection Careful selection of the three external capacitors CIN, COUT and CFLY is very important because they will affect turn on time, output ripple and transient performance. Optimum performance will be obtained when low ESR (