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MAX1556, MAX1556A, MAX1557
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
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX1556EVKIT
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
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Applications/Uses
- Cell Phones/Smartphones
- Digital Cameras and Camcorders
- Handheld Instruments
- PDAs and Palmtop Computers
- Portable MP3 and DVD Players
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≤ |
max w/pins |
See Notes |
| MAX1556 |
2.6 |
5.5 |
0.75 |
5.5 |
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1.2 |
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1 |
1000 |
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9.6 |
$1.66 @1k |
| MAX1557 |
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0.6 |
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$1.56 @1k |
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See All Step-Down Switching Regulators (288)
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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 prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
More Information
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Information Index
Document Ref.: 19-3336
Rev 3;
2011-02-01
This page last modified: 2011-02-01
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