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ADP1621 数据表(PDF) 1 Page - Analog Devices |
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ADP1621 数据表(HTML) 1 Page - Analog Devices |
1 / 32 page Constant-Frequency, Current-Mode Step-Up DC/DC Controller Data Sheet ADP1621 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006–2012 Analog Devices, Inc. All rights reserved. FEATURES 92% efficiency (no sense resistor required) ±1.0% initial accuracy IC supply voltage range: 2.9 V to 5.5 V Power-input voltage as low as 1.0 V Capable of high supply input voltage (>5.5 V) with an external NPN or a resistor VIN UVLO and 35 mA shunt regulator External slope compensation with 1 resistor Programmable operating frequency (100 kHz to 1.5 MHz) with 1 resistor Lossless current sensing for switch-node voltage <30 V Resistor current sensing for switch-node voltage >30 V Synchronizable to external clock Current-mode operation for excellent line and load transient responses 10 µA shutdown current Current limit and thermal overload protection Soft start in 2048 clock cycles Supported by ADIsimPower™ design tool APPLICATIONS APD bias Portable electronic equipment Isolated dc/dc converter Step-up/step-down dc/dc converter LED driver for laptop computer and navigation system LCD backlighting GENERAL DESCRIPTION The ADP1621 is a fixed-frequency, pulse-width modulation (PWM), current-mode, step-up converter controller. It drives an external n-channel MOSFET to convert the input voltage to a higher output voltage. The ADP1621 can also be used to drive flyback, SEPIC, and forward converter topologies, either isolated or nonisolated. The ADP1621 eliminates the use of a current-sense power resistor by measuring the voltage drop across the on resistance of the n-channel MOSFET. This technique, allowed up to a maximum voltage of 30 V at the switch node, maximizes efficiency and reduces cost. For switch-node voltages higher than 30 V or for more accurate current limiting, the CS pin can be connected to a current-sense resistor in the source of the MOSFET. The slope compensation is implemented by an external resistor, allowing a wide range of external components (inductors and MOSFETs), and can be chosen for various switching frequencies and input and output voltages. TYPICAL APPLICATION CIRCUIT ADP1621 IN GATE PGND AGND FB SDSN COMP FREQ GND PIN CS R1 35.7kΩ 1% R2 11.5kΩ 1% C1 47µF 6.3V L1 4.7µH M1 CCOMP 1.8nF COUT1 1µF 10V f OSC = 600kHz C1 = MURATA GRM31CR60J476M COUT3 = SANYO POSCAP 6TPE150M L1 = TOKO FDV0630-4R7M M1 = VISHAY Si7882DP D1 = VISHAY SSA33L RS 80Ω COUT2 10µF 10V RFREQ 31.6kΩ 1% COUT3 150µF 6.3V ×2 VOUT = 5V 1A VIN = 3.3V D1 C3 1µF 10V C4 0.1µF 10V C2 120pF RCOMP 9.09kΩ Figure 1. High Efficiency Output Boost Converter in Lossless Mode, 3.3 V Input, 5 V Output (Bootstrapped) 100 30 0.01 10 LOAD CURRENT (A) 90 80 70 60 50 40 0.1 1 Figure 2. Efficiency of Circuit Shown in Figure 1 The ADP1621 supply input voltage range is 2.9 V to 5.5 V, although higher input voltages are possible with the use of a small-signal NPN pass transistor or a single resistor. The voltage of the power input can be as low as 1 V for fuel cell applications. The switching frequency is set by an external resistor over a range of 100 kHz to 1.5 MHz and can be synchronized to an external clock by using the SDSN pin. The shutdown quiescent current is less than 10 µA. The ADP1621 has a thermal shutdown feature that shuts down the gate driver when the junction temperature reaches approximately 150°C. The internal soft start circuit limits inrush current at startup. The ADP1621 is available in the 10-lead MSOP lead-free package and is specified over the −40°C to +125°C junction temperature range. |
类似零件编号 - ADP1621_15 |
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类似说明 - ADP1621_15 |
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