MAX1947| Datasheet

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19-3086; Rev 2; 10/06

KIT ATION EVALU BLE AVAILA

Low Input/Output Voltage Step-Up DC-DC Converter with RESET
General Description 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 70uA (typ) Operating Supply Current (Measured at OUT) Low 2uA Logic-Controlled Shutdown True Shutdown Fully Discharges Output to Ground Uses Only Small Ceramic Capacitors

MAX1947

The MAX1947 is a compact, high-efficiency, step-up DCDC converter that regulates output voltages from 1.8V to 3.3V to power uP/DSP cores, memory, and I/O rails in 1and 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 70uA for extended battery life. Maxim's proprietary True ShutdownTM reduces supply current to just 2uA 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 RESET output flag provides for power-on reset (POR) and undervoltage detection. The MAX1947 is available in a space-saving 8-pin TDFN package.

75ms RESET Output Flag

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

Ordering Information
TEMP RANGE PIN-PACKAGE PKG CODE T833-1 T833-1

MAX1947ETAxy*-T -40 C to +85 C 8 TDFN 3mm x 3mm MAX1947ETAxy*+T -40 C to +85 C 8 TDFN 3mm x 3mm

*xy represents the output voltage code (e.g., 18 =1.8V). Standard output voltages include 3.3V (33), 3.0V (30), 2.5V (25), and 1.8V (18). Contact the factory for other output voltages in 100mV increments between 1.8V and 3.3V; the minimum order quantity is 25,000 units. +Denotes lead-free package.

Typical Application Circuit
VIN +0.7V TO +VOUT 2.2F LX BATT OUT 10F VOUT +1.8V, +2.5V, +3.0V, +3.3V 4.7H

Pin Configuration
TOP VIEW

RESET GND GND SHDN

1 2

8 7

BATT OUT LX PGND

MAX1947
3 4 6 5

MAX1947
SHDN PGND

RESET GND

TDFN 3mm x 3mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.

True Shutdown is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.