MAX1951A Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC Step-Down Regulator with Enable

19-4689; Rev 0; 7/09
EVAALVUAAILTAIOBNLEKIT
1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC
Step-Down Regulator with Enable
General Description
The MAX1951A high-efficiency, DC-DC step-down
switching regulator delivers up to 2A of output current.
The device operates from an input voltage range of 2.6V
to 5.5V and provides an adjustable output voltage from
0.8V to V_IN, making the MAX1951A ideal for on-board
postregulation applications. The MAX1951A total output
error is less than ±1.5% over load, line, and temperature.
The MAX1951A operates at a fixed frequency of 1MHz
with an efficiency of up to 94%. The high operating fre-
quency minimizes the size of external components.
Internal soft-start control circuitry reduces inrush current.
Short-circuit and thermal-overload protection improve
design reliability.
The MAX1951A can start up safely with a prebiased or
without a preexisting output. This feature simplifies track-
ing supply designs for core and I/O applications and
redundant supply designs.
The MAX1951A is available in an 8-pin SO package
and operates over the -40°C to +85°C extended tem-
perature range.
Applications
ASIC/DSP/µP/FPGA Core and I/O Voltages
Set-Top Boxes
Networking and Telecommunications
Servers
TVs
Features
o Compact 0.385in² Circuit Footprint
o 10µF Ceramic Input and Output Capacitors, 2µH
Inductor for 2A Output
o Efficiency Up to 94%
o 1.5% Output Accuracy Over Load, Line, and
Temperature
o Guaranteed 2A Output Current
o Operates from 2.6V to 5.5V Supply
o Adjustable Output from 0.8V to V_IN
o Internal Digital Soft-Soft
o Short-Circuit and Thermal-Overload Protection
o 1MHz Switching Frequency Reduces Component
Size
o Enable Input Audio Shutdown for Reducing
Power Consumption
o Safe Startup into Prebiased Output
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1951AESA+
-40°C to +85°C
8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
+
V_CC 1
EN 2
GND 3
MAX1951A
FB 4
8 IN
7 LX
6 PGND
5 COMP
SO
Typical Operating Circuit
INPUT
2.6V TO 5.5V
OUTPUT
0.8V TO V_IN, UP TO 2A
IN
LX
MAX1951A
V_CC
FB
COMP
PGND
EN
GND
ON
OFF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.