MAX1797

Low-Supply Current, Step-Up DC-DC Converters with True Shutdown

Low-Supply Current Step-Up DC-DC Converter with True-Shutdown™


Please check latest availability status for a specific part variant.

Description

The MAX1795/MAX1796/MAX1797 are high-efficiency, step-up DC-DC converters intended for small portable hand-held devices. These devices feature Maxim's True Shutdown™ circuitry, which fully disconnects the output from the input in shutdown, improves efficiency, and eliminates costly external components. All three devices also feature Maxim's proprietary LX-damping circuitry for reduced EMI in noise-sensitive applications. For additional in-system flexibility, a battery monitoring comparator (LBI/LBO) remains active even when the DC-DC converter is in shutdown.

The input voltage range is +0.7V to VOUT, where VOUT can be set from +2V to +5.5V. Startup is guaranteed from +0.85V. The MAX1795/MAX1796/MAX1797 have a preset, pin-selectable 5V or 3.3V output. The output can also be adjusted to other voltages, using two external resistors. The three devices differ only in their current limits, allowing optimization of external components for 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.
MAX1795, MAX1796, MAX1797: Functional Diagram MAX1795, MAX1796, MAX1797: Functional Diagram Enlarge+

Key Features

  • > 95% Efficiency
  • True-Shutdown Circuitry
    • Output Disconnects from Input in Shutdown
    • No External Schottky Diode Needed
  • 25µA Quiescent Supply Current
  • Low-Noise Antiringing Feature
  • LBI/LBO Comparator Enabled in Shutdown
  • 2µA Shutdown Current
  • 8-Pin µMAX Package

Applications/Uses

  • PDAs and Palmtops
  • Portable Digital Audio Players
  • Portable Terminals
  • Wireless Handsets
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypeSynchronous SwitchingICC
(mA)
Shutdown Mode Supply Current
(µA)
DC-DC OutputsPackage/PinsBudgetary
Price
minmaxminmaxtyptypSee Notes
MAX1795 0.75.525.5
3.3
5
0.18
Preset
Resistor
InternalYes0.02521
UMAX/8
$4.02 @1k
MAX1796 10.3
UMAX/8
$4.28 @1k
MAX1797 10.55
UMAX/8
$2.29 @1k
See All Step-Up Switching Regulators (97)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1797EVKIT: Evaluation Kit for the MAX1795, MAX1796, MAX1797
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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