MAX1626ESA View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1626ESA

5V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Down DC-DC Controllers

Maxim Integrated 

MAX1626/MAX1627

EVALUATION KIT AVAILABLE

5V/3.3V or Adjustable,

100% Duty-Cycle, High-Efficiency,

Step-Down DC-DC Controllers

General Description

The MAX1626/MAX1627 step-down DC-DC controllers

operate over a 2.6V to 16.5V input voltage range. The

controllers deliver load current from 1mA to more than

2A. The MAX1626 has pin-selectable 3.3V and 5V out-

puts. The MAX1627 supports adjustable outputs from

1.3V to 16V.

A unique current-limited, pulse-frequency-modulation

(PFM) control scheme operates up to 100% duty cycle,

resulting in very low dropout voltage. This control

scheme eliminates minimum load requirements and

reduces supply current under light loads to 90µA

(versus 2mA to 10mA for common pulse-width modula-

tion controllers).

The devices are available in a 8-pin SOIC package

(-40°C to +85°C) and dice (0°C to +70°C).

Applications

• 5V to 3.3V Green PC Applications

• Battery-Powered Applications

• Handheld Computers

• High-Efficiency Step-Down Regulation

• Low-Cost Notebook Computer Supplies

• Minimum Component DC-DC Converters

• PCMCIA Power Supplies

• PDAs and Other Handheld Devices

• Portable Terminals

Pin Configuration

TOP VIEW

OUT 1

3/5 (FB) 2

SHDN 3

REF 4

MAX1626

MAX1627

8 GND

7 EXT

6 CS

5 V+

SO

( ) ARE FOR MAX1627

Benefits and Features

• Reduce External Components and Total Cost

• 300KHz PWM Switching Reduces Component Size

• Tiny Surface-Mount Inductor

• Reduce Power Dissipation

• > 90% Efficiency from 3mA to 2A Loads

• Low Dropout Voltage

• 100% Maximum Duty Cycle

• Reduce Number of DC-DC Controllers to Stock

• Wide 2.6V to 16.5V Input Voltage Options

• Selectable 3.3V and 5V or Adjustable 1.3V to 16V

Output Voltage Options

• Reduce System Power Consumption

• 90µA Max Quiescent Current

• 1µA Max Shutdown Current

• Operates Reliably in Adverse Environment

• Soft-Start Limits Startup Current

• Current-Limited Control Scheme

• Increase Design Flexibility

• External P-Channel MOSFET Allows Output Power

of > 12.5W

Ordering Information

PART

TEMP RANGE

MAX1626C/D

0°C to +70°C

MAX1626ESA

-40°C to +85°C

MAX1627C/D

0°C to +70°C

MAX1627ESA

-40°C to +85°C

* Dice are tested at TA = +25°C.

PIN-PACKAGE

Dice*

8 SO

Dice*

8 SO

Typical Operating Circuit

INPUT

3.3V to 16.5V

V+

MAX1626

ON/OFF

SHDN

CS

EXT

P

3/5

REF

OUT

GND

OUTPUT

3.3V

19-1075; Rev 1; 5/15

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