MAX1951 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators

19-2622; Rev 2; 6/09
1MHz, All-Ceramic, 2.6V to 5.5V Input,
2A PWM Step-Down DC-to-DC Regulators
General Description
The MAX1951/MAX1952 high-efficiency, DC-to-DC
step-down switching regulators deliver up to 2A of out-
put current. The devices operate from an input voltage
range of 2.6V to 5.5V and provide an output voltage
from 0.8V to V_IN, making the MAX1951/MAX1952 ideal
for on-board postregulation applications. The MAX1951
total output error is less than 1% over load, line, and
temperature.
The MAX1951/MAX1952 operate at a fixed frequency of
1MHz with an efficiency of up to 94%. The high operating
frequency minimizes the size of external components.
Internal soft-start control circuitry reduces inrush current.
Short-circuit and thermal-overload protection improve
design reliability.
The MAX1951 provides an adjustable output from 0.8V
to V_IN, whereas the MAX1952 has a preset output of
1.8V. Both devices are available in a space-saving 8-pin
SO package.
Applications
ASIC/DSP/µP/FPGA Core and I/O Voltages
Set-Top Boxes
Cellular Base Stations
Networking and Telecommunications
Features
♦ Compact 0.385in² Circuit Footprint
♦ 10µF Ceramic Input and Output Capacitors, 2µH
Inductor for 1.5A Output
♦ Efficiency Up to 94%
♦ 1% Output Accuracy Over Load, Line, and
Temperature (MAX1951, Up to 1.5A)
♦ Guaranteed 2A Output Current
♦ Operate from 2.6V to 5.5V Supply
♦ Adjustable Output from 0.8V to V_IN (MAX1951)
♦ Preset Output of 1.8V (1.5% Accuracy) (MAX1952)
♦ Internal Digital Soft-Soft
♦ Short-Circuit and Thermal-Overload Protection
Ordering Information/
Selector Guide
PART
TEMP RANGE
PIN-
PACKAGE
OUTPUT
MAX1951ESA+ -40°C to +85°C 8 SO
MAX1952ESA+ -40°C to +85°C 8 SO
Adj 0.8V to V_IN
Fixed 1.8V
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
Typical Operating Circuit
TOP VIEW
V_CC 1
REF 2
GND 3
FB 4
MAX1951
MAX1952
8 IN
7 LX
6 PGND
5 COMP
SO
INPUT
2.6V TO 5.5V
IN
LX
MAX1951
V_CC
FB
OFF
ON
COMP
PGND
REF
GND
OUTPUT
0.8V TO V_IN, UP TO 2A
OPTIONAL
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.