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MAX8716, MAX8717, MAX8756, MAX8757
Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers
Dual, Step-Down, Interleaved, Fixed-Frequency, Switch-Mode Power-Supply (SMPS) Controllers with Synchronous Rectification for Notebook Computers
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Status
| Part Number |
Status |
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MAX8716
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Active: In Production. |
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MAX8717
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Active: In Production. |
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MAX8756
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This product is No Longer Available. |
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MAX8757
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Active: In Production. |
Description
The MAX8716/MAX8717/MAX8756/MAX8757 are dual,
step-down, interleaved, fixed-frequency, switch-mode
power-supply (SMPS) controllers with synchronous rectification.
The MAX8716/MAX8717/MAX8756/MAX8757
are intended for main (5V/3.3V) power generation, while
the MAX8756 is optimized for I/O power rails in battery-powered
systems.
Fixed-frequency operation with optimal interleaving minimizes
input ripple current from the lowest input voltages
up to the 26V maximum input. Optimal 40/60 interleaving
allows the input voltage to go down to 8.3V before
duty-cycle overlap occurs in 5V/3.3V applications, compared
to 180° out-of-phase regulators where the duty-cycle
overlap occurs when the input drops below 10V.
Accurate output current limit is achieved using a sense
resistor. Alternatively, power dissipation can be
reduced using lossless inductor current sensing.
Independent ON/OFF controls and power-good signals
allow flexible power sequencing. Soft-start reduces
inrush current, while soft-stop gradually ramps the output
voltage down preventing negative voltage dips.
A low-noise mode maintains high light-load efficiency
while keeping the switching frequency out of the audible
range.
The MAX8716 is available in a 24-pin thin QFN package,
and the MAX8717/MAX8756/MAX8757 are available
in a 28-pin thin QFN package.
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Data Sheet
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An evaluation kit is available: MAX8717EVKIT MAX8716EVKIT
Key Features
- Fixed Switching Frequency
- 200kHz, 300kHz, or 500kHz
- 250kHz, 300kHz, or 400kHz (MAX8756 Only)
- No Current-Sense Resistor Required
- 40/60 Optimal Interleaving
- Reduced Input-Capacitor Requirement
- Output Voltage Fixed or Adjustable Outputs (Dual Mode™)
- 3.3V/5V Fixed or 1V to 5.5V Adjustable
- 1.5V/1.8V Fixed or 1V to 2.3V Adjustable (MAX8756 Only)
- 4V to 26V Input Range
- Independently Selectable PWM, Skip, and Low-Noise Mode Operation
- Soft-Start and Soft-Stop
- 2V Precision Reference with 0.75% Accuracy
- Independent Power-Good Outputs
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Applications/Uses
- 2 to 4 Li+ Cell Battery-Powered Devices
- Main or I/O Power Supplies
- Notebook and Subnotebook Computers
- PDAs and Mobile Communicators
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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) |
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 |
| MAX8716 |
4.5 |
26 |
1 |
5.5 |
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5 |
5 |
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2 |
300 |
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16.8 |
- |
| MAX8717 |
500 |
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26 |
$4.35 @1k |
| MAX8757 |
500 |
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26 |
- |
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See All Step-Down Switching Regulators (284)
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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
Standard Application Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-3569
Rev 2;
2007-05-11
This page last modified: 2009-09-23
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