MAX1556, MAX1556A

16µA IQ, 1.2A PWM Step-Down DC-DC Converters

16µA Quiescent Current, 1.2A and 600mA, Step-Down Converters are 95% Efficient at 1mA


Please check latest availability status for a specific part variant.

Description

The MAX1556/MAX1556A/MAX1557 are low-operating-current (16µA), fixed-frequency step-down regulators. High efficiency, low-quiescent operating current, low dropout, and minimal (27µA) quiescent current in dropout make these converters ideal for powering portable devices from 1-cell Li-ion or 3-cell alkaline/NiMH batteries. The MAX1556 delivers up to 1.2A; has pin-selectable 1.8V, 2.5V, and 3.3V outputs; and is also adjustable. The MAX1557 delivers up to 600mA; has pin-selectable 1V, 1.3V, and 1.5V outputs; and is also adjustable.

The MAX1556/MAX1556A/MAX1557 contain a low-on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and dropout performance while minimizing external component count. A proprietary topology offers the benefits of a high fixed-frequency operation while still providing excellent efficiency at both light and full loads. A 1MHz PWM switching frequency keeps components small. Both devices also feature an adjustable soft-start to minimize battery transient loading.

The MAX1556/MAX1556A/MAX1557 are available in a tiny 10-pin TDFN (3mm x 3mm) package.
MAX1556, MAX1557: Typical Operating Circuit MAX1556, MAX1557: Typical Operating Circuit Enlarge+

Key Features

  • Up to 97% Efficiency
  • 95% Efficiency at 1mA Load Current
  • Low 16µA Quiescent Current
  • 1MHz PWM Switching
  • Tiny 3.3µH Inductor
  • Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V, and Adjustable Output
  • 1.2A Guaranteed Output Current (MAX1556/MAX1556A)
  • Voltage Positioning Optimizes Load-Transient Response
  • Low 27µA Quiescent Current in Dropout
  • Low 0.1µA Shutdown Current
  • No External Schottky Diode Required
  • Analog Soft-Start with Zero Overshoot Current
  • Small, 10-Pin, 3mm x 3mm TDFN Package

Applications/Uses

  • Cell Phones/Smartphones
  • Digital Cameras and Camcorders
  • Handheld Instruments
  • PDAs and Palmtop Computers
  • Portable MP3 and DVD Players
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1556 2.65.50.755.5
1.8
2.5
3.3
Preset
Resistor
1.2InternalYes11000
TDFN/10
$1.74 @1k
MAX1557 
1
1.3
1.5
0.6
TDFN/10
$1.64 @1k
See All Step-Down Switching Regulators (404)
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.


MAX1556EVKIT: Evaluation Kit for the MAX1556 and MAX1557
USB2GPIO: Evaluation Kit for the USB2GPIO

Technical Documents

App Note 5998 Choose the Right Regulator for the Job: Part 1, Regulator Control Schemes
App Note 4266 An Efficiency Primer for Switch-Mode, DC-DC Converter Power Supplies

Quality and Environmental Data

Product Reliability Reports: MAX1556.pdf 
Request Reliability Report for: MAX1556A 
Lead-Free Package Tin (Sn) Whisker Reports
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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