MP2181GTL-P

MP2181 1A, Synchronous, Step-Down Converter with SS & PG DESCRIPTION FEATURES The MP2181 is a monolithic, step-down, switchmode converter with built-in internal power MOSFETs. It achieves 1A continuous output current from a 2.5V to 5.5V input voltage with excellent load and line regulation. The output voltage can be regulated to as low as 0.6V.         The constant-on-time (COT) control scheme provides fast transient response and eases loop stabilization. Fault protections include cycle-bycycle current limiting and thermal shutdown. The MP2181 is available in an ultra-small SOT583 package, and requires a minimal number of readily available, standard external components. The MP2181 is ideal for a wide range of applications including high-performance DSPs, wireless power, portable and mobile devices, and other low-power systems.        Low IQ: 21μA 1.2MHz Switching Frequency EN for Power Sequencing 1% FB Accuracy Wide 2.5V to 5.5V Operating Input Range Output Adjustable from 0.6V Up to 1A Output Current 90mΩ and 50mΩ Internal Power MOSFET Switches 100% Duty On Output Discharge VO OVP External Soft-Start Control Short-Circuit Protection with Hiccup Mode Power Good Available in a SOT583 Package APPLICATIONS      Wireless/Networking Cards Portable Instruments Battery Powered Devices Low-Voltage I/O System Power Multi-Function Printer All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries. TYPICAL APPLICATION L1 1μH SW VIN R1 100kΩ EN EN SS SS C3 2.2nF MP2181 FB R2 100kΩ PG GND L = 1µH (DCR = 27mΩ) 100 OUT C1 10μF Efficiency vs. Output Current VOUT 1.2V/1A C2 22μF 95 EFFICIENCY(%) VIN 5V 90 85 80 75 70 0.001 MP2181 Rev. 1.0 5/9/2019 Vin=2.5V,Vo=1.2V Vin=3.6V,Vo=1.2V Vin=5V,Vo=1.2V 0.01 0.1 OUTPUT CURRENT(A) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 1 1 MP2181 – 1A, SYNCHRONOUS, STEP-DOWN SWITCHER WITH SS & PG ORDERING INFORMATION Part Number* MP2181GTL Package SOT583 Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP2181GTL–Z). TOP MARKING BEV: Product code of MP2181GTL Y: Year code LLL: Lot number PACKAGE REFERENCE TOP VIEW PG 1 8 VIN FB OUT SW SS GND 4 5 EN SOT583 PIN FUNCTIONS Pin # Name Description 1 PG 2 VIN 3 SW 4 GND 5 EN 6 SS 7 OUT 8 FB MP2181 Rev. 1.0 5/9/2019 Power good indicator. The output of this pin is an open drain. Supply voltage. The MP2181 operates from a +2.5V to +5.5V unregulated input. A decoupling capacitor is needed to prevent large voltage spikes from appearing at the input. Output switching node. SW is the drain of the internal high-side P-Channel MOSFET. Connect the inductor to SW to complete the converter. Ground. On/off control. Soft start. Connect a capacitor across SS and GND to set the soft-start time, and to avoid startup inrush current. Output voltage power rail and input sense pin for output voltage. Connect load to this pin. An output capacitor is needed to decrease the output voltage ripple. Feedback pin. An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 2 MP2181 – 1A, SYNCHRONOUS, STEP-DOWN SWITCHER WITH SS & PG ABSOLUTE MAXIMUM RATINGS (1) Supply voltage (VIN) .................................... 6.5V VSW ...................................................................... -0.3V (-5V for