MAX1820XEBC+T

Product Summary

The MAX1820ZEBC+T low-dropout, pulse-width-modulated (PWM) DC-DC buck regulator is optimized to provide power to the power amplifier (PA) in WCDMA cell phones; however, they may be applied in many other applications where high efficiency is a priority. The supply voltage range is from 2.6V to 5.5V, and the guaranteed output current is 600mA; 1MHz PWM switching allows for small external components, while skip mode reduces quiescent current to 180μA with light loads. The MAX1820ZEBC+T is dynamically controlled to provide varying output voltages from 0.4V to 3.4V. The circuit is designed such that the output voltage settles in <30μs for a full-scale change in voltage and current. The MAX1821 is set with external resistors to provide any fixed output voltage in the 1.25V to 5.5V range. The MAX1820ZEBC+T includes a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count; 100% duty-cycle operation allows for low dropout of only 150mV at 600mA load, including the external inductor resistance. The MAX1820ZEBC+T is offered in 10-pin μMAX and tiny 3×4 chip-scale (UCSP) packages.

Parametrics

MAX1820ZEBC+T absolute maximum ratings: (1)BATT, OUT (FB), SHDN, SYNC, SKIP, REF to GND: -0.3V to +6.0V; (2)PGND to GND: -0.3V to +0.3V; (3)LX, COMP to GND: -0.3V to (VBATT + 0.3V); (4)Output Short-Circuit Duration: Infinite; (5)Continuous Power Dissipation (TA = +70℃), 3*4 UCSP (derate 10.4mW/℃ above +70℃): 832mW; 10-Pin μMAX (derate 5.6mW/℃ above +70℃): 444mW; (6)Operating Temperature Range: -40℃ to +85℃; (7)Junction Temperature: +150℃; (8)Storage Temperature Ranges, 3×4 UCSP: -40℃ to +150℃; 10-Pin μMAX: -65℃ to +150℃; (9)Solder Profile (UCSP): (Note 1); (10)Lead Temperature (soldering, 10s): +300℃.

Features

MAX1820ZEBC+T features: (1)Dynamically Adjustable Output from 0.4V to 3.4V (MAX1820); (2)Programmable Output from 1.25V to 5.5V (MAX1821); (3)SYNC to 13MHz External Clock (MAX1820X); (4)SYNC to 19.8MHz External Clock (MAX1820Y); (5)NO SYNC, Internal 1MHz Oscillator (MAX1820Z); (6)Low Quiescent Current, 180μA (typ) in Skip Mode, 0.1μA (typ) in Shutdown Mode; (7)No External Schottky Diode Required; (8)600mA Guaranteed Output Current; (9)0% to 100% Duty-Cycle Operation; (10)150mV Dropout at 600mA Load (Including RDC of External Inductor); (11)μMAX or UCSP Packaging.

Diagrams