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MAX1577Y, MAX1577Z
1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights
Highest Current, 1.2A, Charge Pumps Enable Brightest WLED Flashes in Camera Phones, Even with Low-Battery Input Voltage
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Status
Active: In Production.
Description
The MAX1577Y/MAX1577Z charge pumps drive white
LEDs, including camera strobes, with regulated current
up to 1.2A (guaranteed to 800mA). The very low openloop
output resistance allows high flash brightness,
even from a low battery input voltage. The adaptive
1x/2x regulating charge-pump operation provides high
efficiency (up to 92%) while in movie mode or backlighting.
Fast (1MHz) switching allows the use of tiny
external components.
The MAX1577Y/MAX1577Z use an external resistor to
set the full-scale LED current. Two enable inputs (EN1
and EN2) provide simple on/off control and LED current
of 20%, 33%, or 100% full scale. If there is less than
24mV across the external resistor, the output voltage is
regulated. The MAX1577Z has fixed 5.1V output-voltage
regulation, while the MAX1577Y has logic-controlled
output voltage of 3.4V, 4.6V, or 5.1V for
backlighting, keyboard, and RGB applications.
The MAX1577Y/MAX1577Z are available in an 8-pin,
3mm x 3mm TDFN package (0.8mm max height).
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Data Sheet
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An evaluation kit is available: MAX1577ZEVKIT
Key Features
- Up to 1.2A Output Drive Capability (800mA Guaranteed)
- Up to 92% PLED / PBATT Efficiency for Movie
Mode
- Flexible Brightness Control
- Two-Bit Logic for 100%, 33%, 20%, and Off
- PWM for 20% to 100%
- 3% Current Regulation Over Line and Temperature
- Current or Voltage Regulation for Flash and Backlighting (MAX1577Y)
- Current Regulation for Flash (MAX1577Z)
- Low Ripple and EMI
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start Limits Inrush Current
- Output-Voltage Regulation Mode
- Thermal-Shutdown Protection
- 8-Pin 3mm x 3mm TDFN Package
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Applications/Uses
- Camera Phones, Cell Phones, and Smartphones
- LCD Backlights
- PDAs, Digital Cameras, and Camcorders
- White LED Flashes, Strobes, and Movie Lights
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Key Specifications:
| White LED Drivers |
| Part Number |
Topology |
LEDs |
Config. |
Dimming Control |
POUT
(W) |
ILED
(mA) |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
VOUT
(V) |
Oper. Freq.
(kHz) |
Package/Pins |
Budgetary Price |
| max num. of |
max |
min |
max |
max |
max |
See Notes |
| MAX1577 |
Charge Pump |
40 |
Parallel |
Digital |
5 |
1200 |
2.7 |
5.5 |
5 |
5.1 |
1000 |
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$1.93 @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.: 19-3461
Rev 0;
2004-11-09
This page last modified: 2007-09-15
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