Datasheet MAX1797 (Maxim)

ПроизводительMaxim
ОписаниеLow-Supply Current, Step-Up DC-DC Converters with True Shutdown
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MAX1795/MAX1796/. Low-Supply Current, Step-Up DC-DC Converters. MAX1797. with True Shutdown. General Description. Features

Datasheet MAX1797 Maxim

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MAX1795/MAX1796/ Low-Supply Current, Step-Up DC-DC Converters MAX1797 with True Shutdown General Description Features
The MAX1795/MAX1796/MAX1797 are high-efficiency, ● > 95% Efficiency step-up DC-DC converters intended for small portable ● True-Shutdown Circuitry hand-held devices. These devices feature Maxim’s True • Output Disconnects from Input in Shutdown Shutdown™ circuitry, which fully disconnects the out- • No External Schottky Diode Needed put from the input in shutdown, improves efficiency, and eliminates costly external components. All three ● 25μA Quiescent Supply Current devices also feature Maxim’s proprietary LX-damping ● Low-Noise Antiringing Feature circuitry for reduced EMI in noise-sensitive applications. ● LBI/LBO Comparator Enabled in Shutdown For additional in-system flexibility, a battery monitoring comparator (LBI/LBO) remains active even when the ● 2μA Shutdown Current DC-DC converter is in shutdown. ● 8-Pin μMAX Package The input voltage range is +0.7V to VOUT, where VOUT can be set from +2V to +5.5V. Startup is guaranteed
Ordering Information
from +0.85V. The MAX1795/MAX1796/MAX1797 have a
PART TEMP RANGE PIN-PACKAGE
preset, pin-selectable 5V or 3.3V output. The output can also be adjusted to other voltages, using two external
MAX1795
EUA -40°C to +85°C 8 μMAX resistors. The three devices differ only in their current
MAX1796
EUA -40°C to +85°C 8 μMAX limits, allowing optimization of external components for
MAX1797
EUA -40°C to +85°C 8 μMAX different loads: The MAX1795, MAX1796, and MAX1797 have current limits of 0.25A, 0.5A, and 1A, respectively. All devices are packaged in a compact, 8-pin μMAX package that is only 1.09mm tall and half the size of an 8-pin SO.
Applications
● Portable Digital Audio Players ● PDAs/Palmtops ● Wireless Handsets ● Portable Terminals
Pin Configuration Typical Operating Circuit
IN 0.7V TO TOP VIEW 5.5V BATT LX LBI 1 8 BATT
MAX1795
FB 2
MAX1795
7 OUT OUT OUT LBI
MAX1796
LBO 3
MAX1796
6 LX FB
MAX1797 MAX1797
LBO SHDN 4 5 GND OFF SHDN
µMAX
ON GND True Shutdown is a trademark of Maxim Integrated Products. 19-1798; Rev 0; 12/00
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