ADP1653ACPZ-R7 Analog Devices Inc, ADP1653ACPZ-R7 Datasheet - Page 13

• Manufacturer Part Number: ADP1653ACPZ-R7
• Description: IC,Laser Diode/LED Driver,LLCC,16PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Type: Photo Flash LEDr

Specifications of ADP1653ACPZ-R7

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Frequency: 1.2MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 200mA, 500mA
• Internal Switch(s): Yes
• Efficiency: 92%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADP1653ACPZ-R7TR

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
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
that drops the voltage when the power LED forward voltage is
less than the battery voltage.
I/O V
CTRL0/SDA
CTRL1/SCL
DD
STR
INTF
EN
INT
16
15
11
10
4
3
1.22V
V
DD
2
C interface.
/2
INTERFACE/
CONTROL
CONTROL
ILED
RI
5
1.22V
SETI
1.22V/RI
(ILED)
I
× 400
= ILED
REF
6
ILED
1.22V
OVP
PROTECTION
REGISTER
THERMAL
7
FAULT
10.15V
OUT
Figure 25. Detailed Block Diagram
WATCHDOG
UVLO
TIMER
RT
14
Rev. B | Page 13 of 24
V
1
V
2.7V
DD
(TORCH)
1.22V
DD
SETT
1.22V/RT
I
= 2.75V TO 5.5V
× 5200
= TORCH
REF
1.22V
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.
CONTROLLER
BIAS
OSCILLATOR
PWM
RF
2
(FLASH)
LED CONTROL
HIGH POWER
1.22V
SETF
I
REF
1.22V/RF
–
+
× 20800
= FLASH
0.32V
L1
13
LX
D1
12
9
8
CIN
PGND
HPLED
PGND
GND
Tx MASK (OPTIONAL)
COUT
PGND
7
ADP1653
OUT