MAX1722

Features:

·Up to 90% Efficiency
·No External Diode or FETs Needed
·1.5µA Quiescent Supply Current
·0.1µA Logic-Controlled Shutdown
·±1% Output Voltage Accuracy
·Fixed Output Voltage (MAX1724) or Adjustable Output Voltage (MAX1722/MAX1723)
·Up to 150mA Output Current
·0.8V to 5.5V Input Voltage Range
·0.91V Guaranteed Startup (MAX1722/MAX1724)
·Internal EMI Suppression (MAX1722/MAX1724)
·Thin SOT23-5 Package (1.1mm max Height)


Application

·Pagers
·Remote Controls
·Remote Wireless
·Transmitters
·Personal
·Medical Devices
·Digital Still Cameras
·Single-Cell Battery-Powered Devices
·Low-Power Hand-Held
·Instruments
·MP3 Players
·Personal Digital
·Assistants (PDA)

Pinout




Specifications

OUT, SHDN, BATT, LX to GND ...............................................-0.3V to +6V
FB to GND ............................................................-0.3V to (VOUT + 0.3V)
OUT, LX Current...................................................................................1A
Continuous Power Dissipation (TA = +70°C)
5-Pin Thin SOT23 (derate 7.1mW/°C above +70°C)..................571mW
Operating Temperature Range ....................................-40°C to +85°C
Junction Temperature.................................................................+150°C
Storage Temperature Range ......................................-65°C to +150°C
Lead Temperature (soldering, 10s) ........................................... +300°C


Description

The MAX1722/MAX1723/MAX1724 compact, high-efficiency, step-up DC-DC converters are available in tiny, 5- pin thin SOT23 packages. They feature an extremely low 1.5µA quiescent supply current to ensure the highest possible light-load efficiency. Optimized for operation from one to two alkaline or nickel-metal-hydride (NiMH) cells, or a single Li+ cell, these devices are ideal for applications where extremely low quiescent current and ultra-small size are critical.

Built-in synchronous rectification significantly improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. All three devices feature a 0.5Ω N-channel power switch. The MAX1722/ MAX1724 also feature proprietary noise-reduction circuitry, which suppresses electromagnetic interference (EMI) caused by the inductor in many step-up applications. The family offers different combinations of fixed or adjustable outputs, shutdown, and EMI reduction (see Selector Guide).