AAT3119

AAT3119 ANALOGICTECH | Alldatasheet

Document overview

• Manufacturer or author: janekim
• PDF pages: 16

Technical content

Features

• V IN Range: 2.7V to 5.5V
• 150mA of Output Current — Peak Current up to 250mA
• Regulated Output Voltage
• 1.2MHz Switching Frequency
• Low Noise Constant Frequency Operation
• <1.0µA of Shutdown Current
• Automatic Soft Start
• Small Application Circuit
• Inductorless Boost
• 8-Pin SC70JW Package
• -40°C to +85°C Temperature Range

Applications

• Cellular Phones
• Digital Cameras
• Handheld Electronics
• PDAs
• White LED Backlighting
• White LED Camera Flash AAT3119 High Efficiency 2X Charge Pump Typical Application AAT3119 IN GND EN OUT COUTCIN 1µF 1µF 1µF C+ C- CFLY Enable VIN VOUT 3119.2005.08.1.1 1 ChargePump™

Pin # Symbol Function 1 EN Enable input control pin. When low, the device is disabled and consumes less than 1µA of current. This pin should not be left floating. 2 IN Input power supply. A 1µF capacitor should be connected between this pin and ground. 3 OUT Charge pump output. Connect a 1µF capacitor between this pin and ground. 4 C+ Flying capacitor positive terminal. Connect a 1µF capacitor between C+ and C-. 5 C- Flying capacitor negative terminal. 6 GND Ground connection. 7 GND Ground connection. 8 GND Ground connection. AAT3119 High Efficiency 2X Charge Pump 2 3119.2005.08.1.1

Symbol Description Value Units ΘJA Thermal Resistance 160 °C/W PD Maximum Power Dissipation3 625 mW Symbol Description Value Units VIN Input Voltage -0.3 to 6.0 V VOUT Charge Pump Output -0.3 to 6.0 V VEN EN to GND Voltage -0.3 to 6.0 V VEN(MAX) Maximum EN to Input Voltage 0.3 V IOUT Maximum DC Output Current 250 mA TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at leads, 10 sec) 300 °C AAT3119 High Efficiency 2X Charge Pump 3119.2005.08.1.1 3 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi- tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. 3. Derate 6.25mW/°C above 25°C.

Electrical Characteristics1 VIN = 3.3V; CIN = COUT = CFLY = 1.0µF; TA = -40°C to 85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Description Conditions Min Typ Max Units AAT3119-5.0 Power Supply VIN Input Voltage Range 2.7 5.5 V VOUT Output Voltage Tolerance 2.7V < V IN < 5V, IOUT = 50mA ±4% Output Voltage 3.0V < V IN < 5V, IOUT = 100mA 4.8 5.0 5.2 V ICC Operating Current V IN = 5.0V, Active, No Load Current 2.0 4.5 mA ISHDN Shutdown Current EN = 0 1.0 µA IOUT Maximum Output Current 3.0 ≤ VIN ≤ 5.5 150 mA η Efficiency V IN = 3.0V, IOUT = 100mA 82 % EN VEN(L) Enable Threshold Low 0.4 V VEN(H) Enable Threshold High EN = 5.5V 1.4 V Ii Enable Input Current -1.0 1.0 µA Charge Pump TSS Soft-Start Time 200 µs FCLK Clock Frequency 1200 kHz AAT3119-4.5 Power Supply VIN Input Voltage Range 2.7 5.5 V VOUT ICC Operating Current V IN = 4.5V, Active, No Load Current 2.0 4.5 mA ISHDN Shutdown Current EN = 0 1.0 µA IOUT Maximum Output Current 3.0 ≤ VIN ≤ 5.5 150 mA η Efficiency V IN = 2.7V, IOUT = 100mA 82 % EN VEN(L) Enable Threshold Low 0.4 V VEN(H) Enable Threshold High EN = 5.5V 1.4 V Ii Enable Input Current -1.0 1.0 µA Charge Pump TSS Soft-Start Time 200 µs FCLK Clock Frequency 1200 kHz AAT3119 High Efficiency 2X Charge Pump 4 3119.2005.08.1.1 1. The AAT3119 is guaranteed to meet performance specifications from 0°C to 70°C. Specification over the -40°C to +85°C operati ng temperature range is assured by design, characterization, and correlation with statistical process controls.

High Efficiency 2X Charge Pump 3119.2005.08.1.1 5 Typical Characteristics _ AAT3119-5V Oscillator Frequency vs. Supply Voltage Supply Voltage (V) Oscillator Frequency (MHz)1.10 1.15 1.20 1.25 1.30 -40°C +85°C +25°C Efficiency vs. Load Current Load Current (mA) Efficiency (%) 100 0.1 1.0 10 100 1000 VIN = 2.7V VIN = 3.0V VIN = 3.3V VIN = 3.6V Efficiency vs. Supply Voltage Supply Voltage (V) Efficiency (%) 100 50mA 100mA 150mA Supply Current vs. VEN VEN Control Voltage (V) Supply Current (mA) 01 3 4 25 6 IOUT = 0µA VIN = 3.3V VIN = 2.8V VIN = 5.5V Supply Current vs. Supply Voltage Supply Voltage (V) Supply Current (mA) 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 IOUT = 0µA CFLY = 1µF VEN = VIN Output Voltage vs. Output Current Output Current (mA) Output Voltage (V) 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 0 40 80 120 160 200 VIN = 2.7 VIN = 3.0 VIN = 3.3 VIN = 3.6

High Efficiency 2X Charge Pump 6 3119.2005.08.1.1 Typical Characteristics _ AAT3119-5V Output Ripple Voltage (IOUT = 100mA @ VIN = 3.5V) VIN (10mV/div) VOUT (20mV/div) IIN (10mA/div) Time (1µs/div) Output Ripple Voltage (IOUT = 50mA @ VIN = 3.5V) VIN (10mV/div) VOUT (10mV/div) IIN (10mA/div) Time (1µs/div) Load Response (100mA Load) VOUT (10mV/div) IOUT (50mA/div) Time (5ms/div) VIN = 3.5V Load Response (50mA Load) VOUT (10mV/div) IOUT (20mA/div) Time (5ms/div) VIN = 3.5V Start-Up Time with 100mA Load Time (100µs/div) VOUT (1V/div) ENABLE (1V/div) Start-Up Time with 50mA Load Time (100µs/div) VOUT (1V/div) ENABLE (1V/div)

Typical Characteristics _ AAT3119-4.5V Oscillator Frequency vs. Supply Voltage Supply Voltage (V) Oscillator Frequency (MHz) -40°C +85°C +25°C 1.10 1.15 1.20 1.25 1.30 Efficiency vs. Load Current Load Current (mA) Efficiency (%) 100 0.1 1.0 10 100 1000 VIN = 2.7V VIN = 3.0V VIN = 3.3V VIN = 3.6V Efficiency vs. Supply Voltage Supply Voltage (V) Efficiency (%) 100 100mA 150mA Supply Current vs. VEN VEN Control Voltage (V) Supply Current (mA) 01 2 3 4 5 6 IOUT = 0µA VIN = 5.5 VIN = 3.3V VIN = 2.8V Supply Current vs. Supply Voltage Supply Voltage (V) Supply Current (mA) 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 IOUT = 0µA CFLY = 1µF VEN = VIN Output Voltage vs. Output Current Output Current (mA) Output Voltage (V) 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 0 40 80 120 160 200 VIN=3.3 VIN=3.6 VIN = 2.7 VIN = 3.0 AAT3119 High Efficiency 2X Charge Pump 3119.2005.08.1.1 7

High Efficiency 2X Charge Pump 8 3119.2005.08.1.1 Typical Characteristics _ AAT3119-4.5V Startup Time (100µs/div) VOUT (1V/div) ENABLE (1V/div) ILOAD = 100mA @ VIN = 3.0V ILOAD = 150mA @ VIN = 3.3V ILOAD = 150mA @ VIN = 3.3V Maximum Current Pulse vs. Supply Voltage Supply Voltage (V) Maximum Current Pulse (mA)0 100 200 300 400 500 600 One-shot pulse duration = 250ms VOUT > 4.0V Output Ripple Voltage (IOUT = 100mA @ VIN = 3.5V) VIN (10mV/div) VOUT (20mV/div) IIN (10mA/div) Time (1µs/div) Output Ripple Voltage (IOUT = 50mA @ VIN = 3.5V) VIN (10mV/div) VOUT (10mV/div) IIN (10mA/div) Time (1µs/div) Load Response (100mA Load) VOUT (10mV/div) IOUT (50mA/div) Time (5ms/div) VIN = 3.5V Load Response (50mA Load) VOUT (10mV/div) IOUT (20mA/div) Time (5ms/div) VIN = 3.5V

Typical Characteristics _ AAT3119 Normalized Output Voltage vs. Temperature Temperature (°C) Normalized Output Voltage (%) -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 -50 -30 -10 10 30 50 70 90 IOUT = 25mA VEN Threshold vs. Supply Voltage Supply Voltage (V) VEN Threshold (V) 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 VIL VIH VIN vs. VIL Supply Voltage (V) VIL (V) +85°C 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 +25°C -40°C VIN vs. VIH Supply Voltage (V) VIH (V) 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 -40°C +25°C +85°C AAT3119 High Efficiency 2X Charge Pump 3119.2005.08.1.1 9

High Efficiency 2X Charge Pump 10 3119.2005.08.1.1 Functional Block Diagram OUT Voltage Reference Soft Start 1MHz Oscillator Charge Pump C1+ C1- GND EN IN Functional Description The AAT3119 is a 5.0V or 4.5V regulated voltage doubling charge pump device intended for general applications that require low noise voltage boost function from input supplies ranging from 2.7V to 5.5V. The charge pump is capable maintaining the regulated voltage output for continuous output cur- rent loads up to 150mA. This makes the AAT3119 ideal for general purpose voltage boost applica- tions, driving white and RGB color LEDs, as well as USB OTG V BUS supplies in portable products. The AAT3119 charge pump and regulation circuit is also capable of supplying peak pulse currents up to 250mA for 500ms. This makes the device suitable for many photo-flash LED applications. The AAT3119 accomplishes the voltage boost func- tion by utilizing a voltage doubling (2X) charge pump. The charge pump block within the device uses low R DS MOSFET switches to transfer charge from the input to output via a flying capacitor (CFLY). This switching process is performed over two phas- es of each clock cycle which is set by the fixed 1.2MHz internal oscillator. On the first phase of each clock cycle, the flying capacitor is placed in parallel with the input (IN) and is charged to the level of the input voltage across C IN. On the second phase of the switching cycle, the flying capacitor is reconfigured by the internal switches and placed in series with the input capacitor. C IN and CFLY are then placed across the output capacitor (C OUT). The voltage seen on COUT is then two times that of CIN. The AAT3119 contains an internal reference and feedback system that senses the charge pump output and controls the charge pump function to maintain an accurate regulated output voltage. Because of the fixed 1.2MHz high frequency inter- nal oscillator, the input, output, and flying capaci- tors are very small. This circuit architecture requires only one 1µF ceramic capacitor for the charge pump flying capacitor (C FLY) and one 1µF ceramic capacitor for both CIN and COUT. The AAT3119 has a soft-start circuit to prohibit in- rush current when the device is enabled. This fea- ture guarantees a smooth transition to the desired output voltage when the device is turned on. The system soft-start circuit is particularly useful in white LED backlight applications where the use of a PWM signal is employed as an LED dimming function. In limiting the input inrush current each time the device is turned on, the soft-start circuit helps minimize back-injected switching noise and transient supply current.

High Efficiency 2X Charge Pump 3119.2005.08.1.1 11 In the operating state, the AAT3119 typically con- sumes 2mA of quiescent operating current. The enable pin (EN) is an active high input. When pulled low, the AAT3119 is shut down, the quies- cent current drops to less than 1µA, and the output is disconnected from the input. Charge Pump Efficiency The core of the AAT3119 is a regulated output volt- age doubling charge pump. The efficiency ( η) for an ideal voltage doubling charge pump can typical- ly be expressed as the output power divided by the input power: In addition, with an ideal voltage doubling charge pump, the output current may be expressed as half the input current. The expression to define the ideal efficiency (η) can be rewritten as: -or- For a charge pump with an output of 5.0 volts and a nominal input of 3.0 volts, the theoretical efficien- cy is 83.3%. Due to internal switching losses and IC quiescent current consumption, the actual effi- ciency can be measured at approximately 82%. Efficiency will decrease as the level of V IN approaches that of the regulated V OUT. Refer to the device typical characteristics curves for expect- ed actual efficiency based on either input voltage or load current. Capacitor Selection Careful selection of the three external capacitors IN, CFLY, and COUT) is important because they will affect turn-on time, output ripple, efficiency, and load transient response. Optimum performance will be obtained when low equivalent series resistance (ESR) ceramic capacitors are used. In general, low ESR may be defined as less than 100mΩ. A value of 1µF for all three capacitors is a good starting point when designing with the AAT3119. This not only provides for a very small printed circuit board area, but cost is further reduced by the minimized bill of materials. Input Capacitor A 1µF multilayer ceramic chip capacitor is suggest- ed for the input. This capacitor should be connect- ed between the IN pin and ground. 1µF should be suitable for most applications. Even though the AAT3119 switching ripple and noise are very low, back-injected line noise may be further reduced by increasing the value of C IN. Other types of capaci- tors may be used for C IN at the cost of compro- mised circuit performance. Output Capacitor The output capacitor (C OUT) should be connected between the OUT pin and ground. A 1µF ceramic capacitor is also suggested in this position. Switching noise and ripple seen on the charge pump output increases with load current. Typically 1µF is sufficient for minimizing output ripple seen by the load circuit. If the load current in an appli- cation is low, or if higher levels of switching ripple can be tolerated, C OUT can be reduced as low as 0.33µF. If application circuits with greater load cur- rent demands require lower switching ripple ampli- tudes, C OUT may be increased to values above 1µF. Capacitor types other than ceramic capaci- tors can be used for C OUT. However, capacitors comprised of materials other than ceramic will typ- ically have a greater value of ESR, resulting in increased output switching ripple. η(%) = 100 VOUT 2VIN η = POUT = VOUT × IOUT = VOUT PIN VIN × 2IOUT 2VIN η = POUT PIN

ESR ceramic capacitor is ideal for this application. help maximize charge pump transient response. not prone to incorrect connection damage. or aluminum electrolytic capacitors. capacitor in a smaller package size. device’s ability to supply greater output current. Figure 1. The maximum brightness is determined

The AAT3119 can source 250mA for pulsed loads up to 500ms from an input supply as low as 3.3V. This makes the device well suited for low-cost flash LED driver applications in portable products. Typically the 4.5V output version of the AAT3119 should be selected for photo-flash LED applica- tions, as it can maintain better voltage regulation at higher pulsed load current levels (refer to Figure 2). The limitation of this option is that the greatest flash LED forward voltage (V F) that can be driven is 4.5V at the maximum set forward current (I F) for the application. Flash LEDs with forward voltage (V F) levels up to 5.0V can be driven by the AAT3119 5.0V output option. However, the maximum cur- rent for a 500ms pulse will be reduced. Refer to the Typical Characteristics curves for peak output current levels for a given minimum input voltage. The forward current (I F) through the flash LED may be determined with the use of a series ballast resis- tor. The typical forward voltage (V F) for the flash LED in a given application should be derived from the LED manufacturer's datasheet for the desired forward current (I F) of the flash application. Once the forward current has been determined, the flash ballast resistor can be calculated using the follow- ing equation: Where: R F = Flash ballast resistor value in ohms ( Ω) VOUT = Regulated charge pump output voltage (typically 4.5V) VF = Flash LED forward voltage at the desired forward current IF = Desired flash LED forward current The flash LED function can be controlled by the AAT3119 enable pin in most applications. The device start-up time into a maximum load is about 200µs, thus eliminating the need for pre-flash con- trol synchronization. RF = (VOUT - VF) IF AAT3119 High Efficiency 2X Charge Pump 3119.2005.08.1.1 13 Figure 1: White LED Driver. AAT3119 IN GND EN OUT COUTCIN 1µF 1µF 1µF C1+ C1- D1 D2 D3 D4 D5 D6 CFLY RB2 RB3 RB4 RB5RB1 RB6 VBATTERY Enable

For the AAT3119, the high charge pump switching frequencies and large peak transient currents require careful printed circuit board layout. As a general rule for charge pump boost converters, the three external capacitors should be located as closely as possible to the device package with min- imum length trace connections. Maximize ground plane around the AAT3119 charge pump and make sure all external capacitor are connected to the immediate power ground plane. A local component side ground plane is recommended. If this is not possible due the layout area limitations, assure good ground connections by the use of large or multiple printed circuit board vias. Refer to the following basic AAT3119 evaluation board shown in Figures xxx for an example of the recommended charge pump layout design. AAT3119 High Efficiency 2X Charge Pump 3119.2005.08.1.1 15 Figure 3: Flash LED Driver with Gated Flash Application. AAT3119 IN GND EN OUT 4.5V COUTCIN RL RF 1µF 1µF 1µF CFLY VIN Enable Flash Enable Flash LED

Ordering Information

Package Information

All dimensions in millimeters. 0.225 ± 0.075 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 2.00 ± 0.20 7° ± 3° 4° ± 4° 0.15 ± 0.05

1.10 MAX

0.100 2.20 ± 0.20 0.048REF 0.50 BSC 0.50 BSC 0.50 BSC All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree. Package Marking 1 Part Number (Tape and Reel)2 SC70JW-8 MUXYY AAT3119IJS-4.5-T1 SC70JW-8 MVXYY AAT3119IJS-5.0-T1 AAT3119 High Efficiency 2X Charge Pump 16 3119.2005.08.1.1 Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech pr oduct. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service wi thout notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of l iability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accorda nce with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific tes ting of all parameters of each device is not necessarily performed. 1. XYY = assembly and date code. 2. Sample stock is held on part numbers listed in BOLD.