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MAX1582
High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
First Dual-Output, White LED Driver for Main and Sub-Displays Reduces Power by 25%
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Status
Active: In Production.
Description
The MAX1582/MAX1582Y drive up to six white LEDs in
series with a constant current to provide display backlighting
for two (main and sub-) displays in cell phones
and other handheld devices. This configuration eliminates
the need for ballast resistors and expensive factory
calibration. The proprietary dual-output, step-up
pulse-width modulation (PWM) converter includes a low
RDSON n-channel MOSFET switch for high efficiency and
maximum battery life.
The MAX1582/MAX1582Y utilize 1MHz current-mode
PWM control to allow small input and output capacitors
and a small inductor, while minimizing ripple on the input
supply and avoiding interference to sensitive circuitry in
the equipment. Integrated overvoltage protection (27V
for the MAX1582 and 18V for the MAX1582Y) eliminates
the need for an external zener diode to protect the IC
from open circuit. Flexible dimming control utilizes either
an analog control signal or direct digital PWM control
without external RC filtering. This also increases dimming
accuracy at low brightness levels. The PWM dimming
signal can be any frequency from 200Hz to 200kHz. Softstart
eliminates inrush current during startup.
The MAX1582/MAX1582Y are available in tiny 4 x 4
chip-scale (UCSP™) and 12-pin thin QFN packages.
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Data Sheet
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An evaluation kit is available: MAX1582EVKIT
Key Features
- Accurate Current Regulation for Uniform
Illumination
- Lights Up Two LED Sections for Main and Subdisplays
- Up to 84% Efficiency
- Internal High-Power, 30V MOSFET
- Low 15mVP-P Input Ripple
- Flexible Dimming Control
- Analog DAC Controlled
- Direct-Digital PWM (No RC Required) from 200Hz to 200kHz
- Overvoltage Protection to Eliminate Zener Diode
- Constant 1MHz PWM Operation
- Low-Profile Inductor and Capacitors
- Soft-Start Eliminates Inrush Current
- 2.6V to 5.5V Input
- 0.01µA (typ) Shutdown Current
- Tiny UCSP (2.1mm x 2.1mm x 0.61mm) and Thin
QFN (4mm x 4mm) Packages
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Applications/Uses
- Cell Phones with One or Two Displays
- Other Handheld Devices with Dual Displays
- Smartphones, Palmtops, 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) |
Oper. Freq.
(kHz) |
Package/Pins |
| max num. of |
max |
min |
max |
max |
max |
| MAX1582 |
Inductor Based |
7 |
Series |
|
100 |
0.6 |
20 |
2.6 |
5.5 |
0.56 |
26 |
1000 |
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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 Application Circuit
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1582ETC
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1582ETC+
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1582ETC+T
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Active |
QFN;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1582ETC-T
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
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Information Index
Document Ref.: 19-2783
Rev 1;
2005-09-21
This page last modified: 2009-10-13
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