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1MHz PWM Boost Converter for 1.5A
White LED Camera Flash
LX
PGND
COMP
1MHz
CLOCK
FORCED-PWM
BOOST CONTROL
REF
1.25V
FEEDBACK
SELECT
OUT
OUTS
EN1
SHUTDOWN AND
MODE CONTROL
LED
EN2
LDO
FLSH
MOV
GND
MAX8607
REGULATOR
LGND
Figure 1. Functional Diagram
Detailed Description
Boost Converter
The MAX8607 includes a fixed-frequency, PWM boost
converter that supplies the LED current. The output
voltage is adaptively controlled to provide adequate
headroom with varying LED forward voltage. The boost
converter switches an internal power MOSFET and syn-
chronous rectifier at a constant 1MHz frequency with
varying duty cycle up to 75% to maintain constant LED
current over the 2.7V to 5.5V input range. Internal spe-
cial circuits prevent any unwanted subharmonic switch-
ing in the critical buck/boost region.
LDO Current Regulator (LED)
A low-dropout (LDO) linear current regulator from LED
to LGND sinks current from the external LED’s cathode
terminal. The LED current is regulated to a user-pro-
grammable level. In movie mode, the current into LED
is regulated to 1200 times the current set by the MOV
resistor (R MOV ). In flash mode, the current into LED is
regulated to 5000 times the current set by the FLSH
resistor (R FLSH ). In disco mode, the current into LED is
regulated to 80mA.
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