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MAX1955, MAX1956
1.6V to 5.5V Input, 0.5% Accurate, Dual 180° Out-of-Phase Step-Down Controllers
Industry's First 0.5%-Accurate, 1.6V to 5.5V Input, Dual-Output, Step-Down DC-DC Controllers
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Status
Active: In Production.
Description
The MAX1955/MAX1956 are dual-output, fixed-frequency, voltage-mode, pulse-width modulated (PWM) step-down controllers with 0.5% output accuracy. Each controller switches at a constant 600kHz and is 180° out-of-phase with the other controller, reducing input ripple current and the number of input capacitors.
An on-chip bias supply generates a 5V gate drive to deliver up to 25A output current per phase with low-cost N-channel MOSFETs at up to 93% efficiency. Lossless adjustable current limit eliminates expensive current-sense resistors and improves efficiency. Foldback current limit reduces power dissipation during short-circuit conditions and handles transient overloads better than controllers using hiccup-mode short-circuit protection.
Output voltage margining shifts output voltage by
±4% from the nominal value to simplify system test. Outputs also can be powered up and down in selectable sequences to meet core and logic supply-rail requirements.
The MAX1955/MAX1956 are available in a 28-lead thin QFN package with exposed pad.
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Data Sheet
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An evaluation kit is available: MAX1955EVKIT
Key Features
- Operates from a 1.6V to 5.5V Supply (MAX1956)
- 0.5% Output Accuracy
- 0.8V to 0.9VIN Output Range
- Up to 25A per Phase Output Current
- On-Chip Boost Regulator Provides 5V Gate Drive
- Up to 93% Efficiency
- 180° Out-of-Phase Operation
- ±4% Voltage Margining
- Lossless, Foldback Current Limit
- Selectable Voltage Sequencing
- Synchronizable to External Clock
- Digital Soft-Start and Soft-Stop
- Small 28-Pin, 5mm x 5mm Thin QFN Package
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Applications/Uses
- DSP, ASIC, µP, and FPGA Supplies
- Servers
- Telecom and Network Equipment
- Wireless Base Stations
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
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 |
| MAX1955 |
2.25 |
5.5 |
0.8 |
5 |
25 |
Resistor |
2 |
600 |
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26 |
- |
| MAX1956 |
1.6 |
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$3.94 @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
Didn't Find What You Need?
Information Index
Document Ref.: 19-2623
Rev 0;
2003-02-28
This page last modified: 2008-03-07
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