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ADP1653
THEORY OF OPERATION
The ADP1653 is a high power, white LED driver ideal for
driving white LEDs for use as a camera flash. The ADP1653
includes a step-up converter and a current regulator suitable for
powering one, or up to three, high power, white LEDs. A second
lower current sink allows an indicator LED to be driven with
2.5 mA to 17.5 mA current.
The ADP1653 responds to a 2-pin control interface that can
operate in two separate pin-selectable modes. Tying the INTF
pin high enables a 2-bit logic hardwire interface. Tying the
INTF pin low enables the I 2 C interface.
WHITE LED DRIVER
The ADP1653 drives a step-up converter to power typically one
or two series-connected, high power LEDs. The white LED driver
regulates the high power LED current for accurate brightness
control. The ADP1653 uses an integrated NFET current regulator
When the required LED voltage is greater than the battery voltage,
the NFET current regulator voltage at the HPLED pin is approxi-
mately 320 mV, and the step-up converter applies the appropriate
voltage to OUT, allowing the LED to conduct the regulated current.
When the white LED is turned on, the step-up converter output
voltage slew is limited to 18 V/ms to prevent excessive battery
current while charging the output capacitor. The output voltage
of the step-up converter is sensed at OUT. If the output voltage
exceeds the 10.15 V (typical) limit, the white LED converter
turns off to indicate that a fault condition has occurred through
the INT output and system registers. This feature prevents damage
due to an overvoltage if the white LED string fails with an open-
circuit condition.
Setting the LED regulation currents depends on the 2-pin
control interface used, as described in the following sections.
that drops the voltage when the power LED forward voltage is
less than the battery voltage.
V DD = 2.75V TO 5.5V
CIN
L1
D1
PGND
7
OUT
6
ILED
7
OUT
14
V DD
13
LX
COUT
PGND
STR 16
EN 15
ILED
CONTROL
OVP
10.15V
UVLO
2.7V
BIAS
OSCILLATOR
CTRL0/SDA 4
CTRL1/SCL 3
I/O V DD
INTERFACE/
CONTROL
FAULT
REGISTER
THERMAL
PROTECTION
PWM
CONTROLLER
INT
11
–
9
HPLED
V DD /2
+
0.32V
INTF
10
WATCHDOG
TIMER
HIGH POWER
LED CONTROL
× 400
= ILED
× 5200
= TORCH
× 20800
= FLASH
12
PGND
1.22V
I REF
(ILED)
1.22V
I REF 1.22V
(TORCH)
I REF
(FLASH)
8
GND
1.22V
1.22V
1.22V
RI
5
SETI
1.22V/RI
RT
1
SETT
1.22V/RT
RF
2
SETF
1.22V/RF
Tx MASK (OPTIONAL)
Figure 25. Detailed Block Diagram
Rev. B | Page 13 of 24
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