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MAX1570
White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
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Status
Active: In Production.
Description
The MAX1570 fractional charge pump drives up to five white LEDs with regulated constant current for uniform intensity. The MAX1570 maintains the highest possible efficiency over the full 1-cell lithium-ion (Li+) battery input voltage range by utilizing a 1x/1.5x fractional charge pump and very-low-dropout current regulators. The MAX1570 operates with 1MHz fixed-frequency switching, allowing for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple.
An external resistor sets the full-scale LED current, while two digital inputs control on/off and select between three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness.
The MAX1570 is available in 16-pin 4mm x 4mm Thin QFN packaging (0.8mm max height).
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Data Sheet
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An evaluation kit is available: MAX1570EVKIT
Key Features
- Excellent 0.3% LED-to-LED Current Matching
- 30mA/LED Drive Capability
- Proprietary 1x/1.5x Modes for Ultra-High Efficiency
- Low Input Ripple and EMI
- Eliminates Ballast Resistors
- Digital or PWM LED Dimming Control
- 0.1µA Shutdown Current
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start Limits Inrush Current
- Thermal-Shutdown Protection
- No External Inductor, Schottky, or Zener Diode Required
- Tiny 16-Pin 4mm x 4mm Thin QFN Package
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Applications/Uses
- Cell Phones/Smartphones
- Digital Cameras and Camcorders
- PDAs and Palmtop Computers
- Portable MP3 Players
- White LED Backlighting
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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 |
| MAX1570 |
Charge Pump |
5 |
Parallel |
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0.7 |
30 |
2.7 |
5.5 |
3.5 |
5 |
1000 |
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$1.90 @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
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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| MAX1570ETE
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Active |
TQFN;16 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0070 (PDF)
Use pkgcode/variation: T1644-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1570ETE+
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Active |
TQFN;16 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0070 (PDF)
Use pkgcode/variation: T1644+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1570ETE+T
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Active |
TQFN;16 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0070 (PDF)
Use pkgcode/variation: T1644+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1570ETE-T
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Active |
QFN;16 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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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Similar Products by Function
| MAX1848 |
White LED Step-Up Converter in SOT23 |
| MAX1916 |
Low-Dropout, Constant-Current Triple White LED Bias Supply |
| MAX1595 |
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump |
| MAX1910, MAX1912 |
1.5x/2x High-Efficiency White LED Charge Pumps |
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Similar Products by Application
Evaluation Kits
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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2526
Rev 1;
2005-07-01
This page last modified: 2010-05-12
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