MP2126DN-LF

MP2126 1.25MHz, 2.5A Step-Down Switcher with a 0.5A LDO The Future of Analog IC Technology DESCRIPTION FEATURES The MP2126 is an internally compensated 2.5A synchronous step-down switcher plus a standalone 0.5A low dropout (LDO) linear regulator. It is ideal for powering portable equipment that runs from a single cell LithiumIon (Li+) Battery. The MP2126 can provide up to 2.5A to the switcher output, and 0.5A load current to the LDO output from a 2.5V to 6V input voltage. Both switcher and LDO output voltages can be regulated as low as 0.6V. The 2.5A switcher features an integrated high-side switch and synchronous rectifier for high efficiency. The switcher operating frequency is internally set at 1.25MHz. With peak current mode control and internal compensation, the MP2126 can be stabilized with ceramic capacitors and small inductors. Fault condition protection includes cycle-bycycle current limiting and thermal shutdown. The standalone 0.5A LDO output is used to power noise sensitive circuitry. The LDO separate input supply pin (IN2) can be connected to the switcher output to reduce power dissipation and noise from the main switcher. x x x x x x x x x x x x x x x x 2.5A Switcher Output Current 0.5A LDO Output Current Internal Power MOSFET Switches Stable with Ceramic Capacitors Up to 90% Efficiency for Switcher Switcher Low Dropout Operation: 100% Duty Cycle 1ȝA Shutdown Current 1.25MHz Switching Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Short Circuit Protection Internal Soft-start for Switcher Power On Reset Output 2.5V to 6V Input Range VIN1 for Switcher 1V to VIN1 Input Range VIN2 for LDO Available in 8-pin SOIC with Exposed Pad APPLICATIONS x x x DVD+/-RW Drives LCD TVs Industrial Instruments “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. MP2126 is available in an 8-pin SOIC package with exposed pad. TYPICAL APPLICATION Efficiency vs. Load Current VOUT=1.8V 100 90 80 70 Vin=6V 60 Vin=3.3V Vin=2.5V 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 LOAD CURRENT(A) MP2126 Rev. 0.9 8/3/2009 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. 1 MP2126 – 1.25MHZ, 2.5A STEP-DOWN SWITCHER AND 0.5A LDO ORDERING INFORMATION Part Number* Package Top Marking Temperature MP2126DN SOIC8E MP2126DN –40qC to +85qC *For Tape & Reel, add suffix –Z (e.g. 2126DN–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP2126DN–LF–Z) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS (1) IN1, OUT1/2 to GND..................–0.3V to + 6.5V IN2 to GND .........................–0.3V to VIN1 + 0.3V SW1 to GND .......................–0.3V to VIN1 + 0.3V ......................(VSW1>-2.5V, Transient