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GM2102 fiches techniques PDF

Gamma - CONSTANT CURRENT DC/DC WHITE LED DRIVER

Numéro de référence GM2102
Description CONSTANT CURRENT DC/DC WHITE LED DRIVER
Fabricant Gamma 
Logo Gamma 





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GM2102 fiche technique
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PRELIMINARY
GM2102
CONSTANT CURRENT DC/DC WHITE LED DRIVER
GENERAL DESCRIPTION
The GM2102 is a member of Gamma Microelectronics’s
family of white LED drivers.
The GM2102 is a fixed frequency step-up DC/DC
converter designed to operate as a constant-current
source. It is ideal for driving light emitting diodes (LEDs)
whose light intensity is proportional to the current
passing through them and not on the voltage across their
terminals as it directly regulates the output current.
The wide input voltage range allows the device to work
from a variety of input sources. A single external
resistor sets LED current between 5mA and 40mA,
which can then be easily adjusted using either a DC
voltage or a PWM signal. In Shutdown mode, the
LED’s are disconnected from the output with the
maximum quiescent current of 1µA for the entire circuit.
FEATURES
Drives Six White LED’s from 1.8 V
1.2Mhz Fixed Frequency Switching
Minimum operating input voltage 1.2V
90% efficiency
Accurately adjustable LED current
Current Regulation even when
Vin > Vout
Disconnects LED’s in Shutdown mode
Available in SOT23 Package ideal for
space conscious portable applications
TYPICAL APPLICATION
Vin
2.7V to 4.2V
6.8 uH
D1
C1
4.7 uF
PWM
DIMMING
CONTROL
SIGNAL
61
Vin SW
GM2102
53
SHDN
LED
Rset
GND
4 Rset
1.5K
2
C2
1 uF
15mA
APPLICATIONS
Cellular Phones
Digital Cameras
Handheld Computers
Portable Audio players
Pagers
Other White LED applications
Revision 1, March 2003 1 www.gammamicro.com

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