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OCP81373
High Efficiency Synchronous Boost Converter
With Dual Independent 1.5A Current Sources
General Description
The OCP81373 is a dual LED flash driver that
provides a high level of adjustability within a small
solution size. The OCP81373 utilizes a 2-MHz or
4-MHz fixed-frequency synchronous boost converter to
provide power to the dual 1.5A constant current LED
sources. The total LED current the OCP81373 boost
can deliver is 1.5A (ILED1+ ILED2). The dual 128 level
current sources provide the flexibility to adjust the
current ratios between LED1 and LED2 with each
driver capable of delivering a maximum of 1.5A. An
adaptive regulation method ensures the current
sources remain in regulation and maximizes efficiency.
Features of the OCP81373 are controlled via an
I2C-compatible interface. These features include:
hardware flash and hardware torch pins (STROBE and
TORCH/TEMP), a TX interrupt, and an NTC thermistor
monitor. The device offers independently
programmable currents in each output leg to drive the
LEDs in a Flash or Movie Mode (Torch) condition.
The 2-MHz or 4-MHz switching frequency options,
overvoltage protection (OVP), and adjustable current
limit allow for the use of tiny, low-profile inductors and
(10-µF) ceramic capacitors. The device operates over
a 40°C to 85°C ambient temperature range.
Features
1.5A Total Allowed LED Current During
Operation
Dual Independent LED Current Source
Programmability
Accurate and Programmable LED Current
Range from 2.92mA to 1.5A
Optimized Flash LED Current During Low
Battery Conditions (IVFM)
Grounded Cathode LED Operation for Improved
Thermal Management
Small Solution Size:<16mm2
Hardware Strobe Enable (STROBE)
Synchronization Input for RF Power Amplifier
Pulse Events (TX)
Hardware Torch Enable (TORCH/TEMP)
Remote NTC Monitoring (TORCH/TEMP)
400-kHz I2C-Compatible Interface
OCP81373(I2C Address=0x63)
Applications
Camera Phone White LED Flash
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Pin Configuration
WLCSP-12B (Top View)
OCP81373
Pin Name
GND
IN
SDA
SW
STROBE
SCL
OUT
HWEN
TORCH/TEMP
LED2
TX
LED1
Figure 1, Pin Assignments of OCP81373
Pin No.
WLCSP-12B
I/O
Pin Function
A1 P Ground
A2
I
Input voltage connection. Connect IN to the input supply and
bypass to GND with a 10µF or larger ceramic capacitor.
A3 I/O Serial data input/output in the I2C Mode on OCP81373.
B1
P
Drain Connection for Internal NMOS and Synchronous PMOS
Switches.
Active high hardware flash enable. Drive STROBE high to turn
B2 I/O on Flash pulse. Internal pulldown resistor 300kΩ between
STROBE and GND
B3 I/O Serial clock input for OCP81373
C1
O
Step-up DC/DC Converter Output. Connect a 10µF ceramic
capacitor between this terminal and GND.
Active high enable pin. High = Standby, Low =
C2 I Shutdown/Reset. Internal pulldown resistor of 300kΩ between
HWEN and GND.
C3
I
Torch terminal input or threshold detector for NTC temperature
sensing and current scale back.
D1 O High-side current source output for flash LED.
Configurable dual polarity power amplifier synchronization
D2 I input. Internal pulldown resistor of 300kΩ between TX and
GND.
D3 O High-side current source output for flash LED.
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Typical Application Circuit
OCP81373
Figure 2, Typical Application Circuit of OCP81373
Ordering Information
Part Number
OCP81373WPAD
Driver Capability
1.5A
Package Type
WLCSP-12B
Package Qty
7-in reel
3000pcs/reel
Temperature
-4085
Eco Plan
Green
Lead/Ball
Finish
Cu Sn
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8ev.1.1 Feb .27, 2018
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