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MAX1574
180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
White LED Charge Pump in 3mm x 3mm TDFN Achieves 83% Average Efficiency
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Status
Active: In Production.
Description
The MAX1574 charge pump drives up to three white
LEDs with regulated constant current for uniform intensity.
By utilizing adaptive 1x/2x charge-pump modes and
very-low-dropout current regulators, it achieves 180mA
output drive capability and high efficiency over the 1-cell
lithium-battery input voltage range. Fixed-frequency
(1MHz) switching allows for tiny external components,
and the regulation scheme is optimized to ensure low EMI
and low input ripple.
The MAX1574 uses an external resistor to set the fullscale
100% LED current. An enable input (EN) is used for
simple on/off control or can be pulsed repeatedly to set
lower LED current in multiple steps down to 5%. Once the
desired brightness is set, the MAX1574 maintains constant
LED current as long as EN is kept high. If EN is kept
low for more than 2ms, the MAX1574 enters shutdown.
The MAX1574 is available in a 10-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: MAX1574EVKIT
Key Features
- Up to 180mA (60mA/LED) Drive Capability
- 83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
- 0.5% (typ) LED Current Matching
- Adaptive 1x/2x Mode Switchover
- Low Input Ripple and EMI
- 5% to 100% Dimming Through Single-Wire Serial Pulse Interface
- Low 0.1µA Shutdown Current
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start Limits Inrush Current
- Output Overvoltage Protection
- Thermal-Shutdown Protection
- 10-Pin 3mm x 3mm TDFN Package
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Applications/Uses
- Camera Strobes/Flashes and Movie Lights
- Cell Phones/Smartphones
- LCD Backlights
- PDAs, Digital Cameras, and Camcorders
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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 |
| MAX1574 |
Charge Pump |
3 |
Parallel |
Serial Pulse |
0.75 |
60 |
2.7 |
5.5 |
2 |
5 |
1000 |
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$1.44 @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
Application Notes
Product Guides
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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| MAX1574ETB+
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Active |
TDFN-EP;10 pin;9.6 mm²
Outline Drawing:21-0137 (PDF)
Land Pattern: 90-0003 (PDF)
Use pkgcode/variation: T1033+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1574ETB+T
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Active |
TDFN-EP;10 pin;9.6 mm²
Outline Drawing:21-0137 (PDF)
Land Pattern: 90-0003 (PDF)
Use pkgcode/variation: T1033+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1574ETB-T
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Active |
TDFN-EP;10 pin;9.6 mm²
Outline Drawing:21-0137 (PDF)
Land Pattern: 90-0003 (PDF)
Use pkgcode/variation: T1033-1*
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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
Didn't Find What You Need?
Information Index
Document Ref.: 19-3117
Rev 0;
2004-01-23
This page last modified: 2009-10-08
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