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MAX1553, MAX1554
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
Smallest, Highest Efficiency, 40V Driver for Up to 10 White LEDs
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Status
Active: In Production.
Description
The MAX1553/MAX1554 drive white LEDs in series with
a constant current to provide efficient display backlighting
in cellular phones, PDAs, and other hand-held
devices. The step-up converter includes an internal
40V, low RDSON, N-channel MOSFET switch for high
efficiency and maximum battery life. The MAX1553 has
a current limit of 480mA for driving two to six white
LEDs, while the MAX1554 has a current limit of 970mA
for driving up to 10 white LEDs.
A single analog/PWM Dual Mode™ input provides two
simple means of brightness adjustment. A separate
enable input provides on/off control. Soft-start minimizes
inrush current during startup.
The MAX1553/MAX1554 are available in space-saving
8-pin TDFN 3mm x 3mm packages.
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Data Sheet
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An evaluation kit is available: MAX1553EVKIT
Key Features
- Constant-Current Regulation for Even LED
Illumination
- Internal 40V MOSFET Switch Capable of Driving
10 LEDs
- Small, Low-Profile External Components
- 2.7V to 5.5V Input Range
- Up to 88% Efficiency Driving 6 LEDs
- Up to 82% Efficiency Driving 9 LEDs
(20mA, VCC = 3.6V)
- Analog or PWM Control of LED Intensity
- Optimized for Low Input Ripple
- Soft-Start to Minimize Inrush Current
- 3mm x 3mm 8-Pin TDFN Package
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Applications/Uses
- Cell Phones
- Color Display Backlight
- PDA, Palmtop, and Wireless Handhelds
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Key Specifications:
| White LED Drivers |
| Part Number |
Topology |
LEDs |
Config. |
Dimming Control |
VCURR_SENSE
(mV) |
POUT
(W) |
ILED
(mA) |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
VOUT
(V) |
Package/Pins |
Budgetary Price |
| max num. of |
max |
min |
max |
max |
max |
See Notes |
| MAX1553 |
Inductor Based |
6 |
Series |
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200 |
0.5 |
20 |
2.7 |
5.5 |
0.35 |
40 |
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$1.25 @1k |
| MAX1554 |
10 |
0.8 |
0.65 |
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$1.35 @1k |
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See All White LED Drivers (47)
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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.: 19-2875
Rev 1;
2004-02-05
This page last modified: 2007-08-10
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