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 RESET-bar output flag provides for power-on
reset (POR) and undervoltage detection. The MAX1947
is available in a space-saving 8-pin TDFN package.
Key Features
Applications/Uses
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)
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.
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