MAX1570ETE+ by Analog Devices

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump


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).

Where to Buy

Prices starting from US$4.82

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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

Specifications

VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 5
# LED Channels 5
Regulation Topology Charge Pump
Battery Input 1-Cell Li+
LED Configuration Parallel
ILED per Channel (A) (max) 0.03
PWM Dimming Freq. (kHz) (max) 5
Dimming Control DigitalPWM
POUT (W) 0.7
ICC (mA) (max) 3.5
LED String Volt. (V) (max) 5
Switching Frequency (kHz) 1000
Package/Pins TQFN/16
BudgetaryPrice (See Notes) 2.3


MAX1570ETE+ Semiconductors - ICs by Analog Devices

LED DRIVER CHARGE PUMP 1MHZ TQFN-16

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Device Topology Charge Pump
Input Voltage Min 2.7V
Input Voltage Max 5.5V
Output Voltage Max -
Output Current Max 30mA
Switching Frequency 1MHz
No. of Outputs 5Outputs
IC Mounting SMD
Driver Case Style TQFN
No. of Pins 16Pins
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Output Current 30mA

Alternative Descriptions

LED DRIVER, CHARGE PUMP, 1MHZ, TQFN-16 | Farnell

Frequently Asked Questions

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Is the MAX1570ETE+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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