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Numéro de référence | SGM3144 | ||
Description | 6-Channel PWM Dimming Charge Pump White LED Driver | ||
Fabricant | Shengbang Microelectronics | ||
Logo | |||
SGM3144
6-Channel PWM Dimming
Charge Pump White LED Driver
GENERAL DESCRIPTION
The SGM3144 is a high performance white LED driver.
It integrates current sources and automatic mode
selection charge pump. The part maintains the high
efficiency by utilizing a 1×/1.5× fractional charge pump
and low dropout current sources. The small equivalent
1× mode open loop resistance and ultra-low dropout
voltage of current source extend the operating time of
1× mode and optimize the efficiency of Li-ion battery in
white LED applications.
The SGM3144 supports up to 6 white LEDs and
regulates a constant current which the initial value can
be set by an internal resistor. The part implements
PWM dimming to adjust the brightness of LED. Users
can easily configure the LED current from 0mA to
27mA by a digital PWM signal. SGM3144 can be
turned off by EN pin. The operating voltage range is
2.7V to 5.5V. Internal soft-start circuitry effectively
reduces the in-rush current while both start-up and
mode transition.
The SGM3144 is available in Green TQFN-3×3-16L
package and is rated over the -40°C to +85°C
temperature range.
FEATURES
Input Voltage Range: 2.7V to 5.5V
Drives up to 6 LEDs at 27mA Each
PWM Dimming
High Efficiency by Fractional Conversion with
1× and 1.5× Modes
Switching Frequency: 0.93MHz
Regulated Output Current with ±4.8% Matching
Internal Soft-Start Limits Inrush Current
Low Input Ripple and Low EMI
Over-Current and Over-Temperature Protection
Under-Voltage Lockout with Hysteresis
Available in Green TQFN-3×3-16L Package
APPLICATIONS
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
SG Micro Corp
www.sg-micro.com
REV. A. 1
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Pages | Pages 12 | ||
Télécharger | [ SGM3144 ] |
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