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MAX1947

Low Input/Output Voltage Step-Up DC-DC Converter with Active-Low RESET

Smallest 1.8V Output Step-Up Converter with True Shutdown for 1-/2-Cell Alkaline Handhelds

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1947 is a compact, high-efficiency, step-up DC-DC converter that regulates output voltages from 1.8V to 3.3V to power µP/DSP cores, memory, and I/O rails in 1-and 2-cell alkaline/NiMH/NiCd battery-powered systems. It features an internal 800mA switch and synchronous rectifier to achieve up to 94% efficiency and to eliminate the need for an external Schottky diode.

High-frequency switching (up to 2MHz) results in low ripple and small external components, while automatic pulse skipping at light loads reduces supply current to just 70µA for extended battery life. Maxim's proprietary True Shutdown™ reduces supply current to just 2µA and fully discharges the output to ground. The converter is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V, and 3.3V, requiring no feedback or compensation network. A 75ms active-low RESET output flag provides for power-on reset (POR) and undervoltage detection. The MAX1947 is available in a space-saving 8-pin TDFN package.

Data Sheet

Download	Rev 2	(PDF, 252kB)
E-Mail

An evaluation kit is available: MAX1947EVKIT

Key Features

Low Input (0.7V) and Output (1.8V) Voltage Capability
Internal Synchronous Rectifier
High 94% Efficiency
Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V
Up to 2MHz Switching Allows Small External Components and Low Output Ripple
Automatic Pulse Skipping at Light Loads for Extended Battery Life
Low 70µA (typ) Operating Supply Current (Measured at OUT)
Low 2µA Logic-Controlled Shutdown
True Shutdown Fully Discharges Output to Ground
Uses Only Small Ceramic Capacitors
75ms Active-Low RESET Output Flag

Applications/Uses

Cordless Phones
Digital Still Cameras
MP3 Players, Pagers, and CD Players
Other Battery-Powered Systems
PDAs and Organizers
Portable Medical Equipment
Wireless Mice/Keyboards

Key Specifications:

Step-Up Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX1947

0.7

3.6

1.8

3.3

1.8

1.9

2.5

2.7

3.3

0.25

Preset

TDFN-EP/8

9.6

$1.42 @1k

See All Step-Up Switching Regulators (91)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

More Information

Topmark Coding	MAX1947
New Product Press Release	[ 2004-07-12 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-3086 Rev 2; 2006-12-06
This page last modified: 2009-12-07