MAX1820ZEUB

Input Voltage MAX : 5.5 V
Number of Outputs : 1
Mounting Style : SMD/SMT
Maximum Operating Temperature : + 85 C
Switching Frequency : 1000 KHz
Output Current : Adjustable
Package / Case : uMAX
Output Voltage : 0.4 V to 3.4 V


Specifications

Item	Rating
BATT, OUT (FB), SHDN, SYNC, SKIP, REF to GND	-0.3V to +6.0V
PGND to GND	-0.3V to+ 0.3V
LX, COMP to GND	-0.3V to (VBATT + 0.3V)
Output Short-Circuit Duration	Infinite
Operating Temperature Range	-40 to +85
Junction Temperature	+150
Storage Temperature Ranges	-65 to +150
Lead Temperature (soldering, 10s)	+300
Continuous Power Dissipation (TA = +70) 10-Pin MAX	444mW
Derates above +70 10-Pin MAX	5.6mW/

Description

The MAX1820ZEUB 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, it 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 180A with light loads.

The MAX1820ZEUB 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 <30s for a full-scale change in voltage and current.

The MAX1820ZEUB 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 device is offered in 10-pin MAX and tiny 3 x 4 chipscale (UCSP™) packages