MIC2297
40V PWM Boost Regulator
White LED Driver
General Description
The MIC2297 is a 600KHz PWM boost-switching regulator
that is optimized for driving 6-10 series white LEDs. With
its internal 40V switch and a guaranteed switch current of
1.2A, the MIC2297 easily drives a string of 10 white LEDs
in series at 20mA, ensuring a high level of brightness and
eliminating several ballast resistors.
The MIC2297 implements constant frequency 600KHz
PWM control. The high frequency PWM operation saves
board space by reducing external component sizes. The
added benefit of the constant frequency PWM operation is
much lower noise and input ripple injected back to the
battery source than with variable frequency topologies.
To optimize efficiency, the feedback voltage is set to
200mV. This reduced voltage reduces the power
dissipation in the current set resistor, and allows the lowest
total output voltage, hence minimal current draw from the
battery.
The MIC2297 is available with output over-voltage
protection that protects the IC and external components in
case of open LED conditions.
The MIC2297 is available in low profile small size 2.5mm x
2.5mm MLF鈩?10L package. The MIC2297 has a junction
temperature range of 鈥?0掳C to +125掳C.
Features
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2.5V to 10V input voltage range
Output voltage up to 40V
1.2A switch current
600KHz PWM operation
Trimmed 200mV feedback voltage
Output over voltage protection (fixed or adjustable)
PWM Brightness Control
DAC Brightness Control
<1% line regulation
1碌A shutdown current
Over temperature protection
UVLO
2.5mm x 2.5mm MLF鈩?10L package
鈥?0
o
C to +125
o
C junction temperature range
Applications
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PDAs
GPS systems
Smart phones
Mini PCs
Digital cameras
IP phones
LED flashlights
___________________________________________________________________________________________________________
Typical Applications
6.8碌H-22碌H
6.8碌H-22碌H
VIN
SW
OVP
1-Cell
Li I on
3V to 4.2V
1碌F
EN
MIC2297
BRT
-42BM
L
REF
FB
0.47碌F
/50V 1-Ce ll
Li I on
3V to 4.2V
VIN
SW
OVP
1碌F
PWM
EN
MIC2297
BRT
-42BM
L
REF
FB
0.47碌F
/50V
1碌F
AGN PGND COMP
D
0.1碌F
10
1碌F
AGND PGND COMP
0.1碌F
10
10 Series LED Driver with Output OVP
MLF and
MicroLeadFrame
is a trademark of Amkor Technology
10 Series LED Driver with PWM Brightness Control
Micrel Inc. 鈥?2180 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel +1 (
408
) 944-0800 鈥?fax + 1 (408) 474-1000 鈥?http://www.micrel.com
May 2005
M9999-050305
(408) 955-1690
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