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OCP8137
High Efficiency Synchronous Boost Converter
With Dual Independent 1.5A Current Sources
General Description
The OCP8137 is a dual LED flash driver that
provides a high level of adjustability within a small
solution size. The OCP8137 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 OCP8137 boost can
deliver is 2A (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 2A (ex: ILED1= 1.5A
and ILED2= 0.5A, ILED1= 0.5A and ILED2= 1.5A, or a
current configuration with a current less than 1.5A,
ILED1= 1.0A and ILED2=1.0A). An adaptive regulation
method ensures the current sources remain in
regulation and maximizes efficiency.
Features of the OCP8137 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
2 A Total Allowed LED Current During
Operation
Dual Independent LED Current Source
Programmability
Accurate and Programmable LED Current
Range from 1.46mA 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
OCP8137 (I2C Address=0x63)
Applications
Camera Phone White LED Flash
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Rev.1.6 Feb .27, 2018
源于灿瑞 磁传天下

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Pin Configuration
WLCSP-12B (Top View)
OCP8137
Pin Name
GND
IN
SDA
SW
STROBE
SCL
OUT
HWEN
TORCH/TEMP
LED2
TX
LED1
Figure 1, Pin Assignments of OCP8137
Pin No.
WLCSP-12B
I/O
Pin Function
A1 P Ground
A2
P
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 OCP8137.
B1
P
Drain Connection for Internal NMOS and Synchronous PMOS
Switches.
B2
I
Drain connection for internal NMOS and Synchronous PMOS
Switches.
B3 I Serial clock input for OCP8137
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 pull down resistor of 300kΩ between
HWEN and GND.
C3
I/O
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 pull down resistor of 300kΩ between TX and
GND.
D3 O High-side current source output for flash LED.
Page2 - 3
Rev.1.6 Feb .27, 2018
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Typical Application Circuit
OCP8137
Figure 2, Typical Application Circuit of OCP8137
Ordering Information
Part Number
OCP8137WPAD
Driver Capability
2A
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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Rev.1.6 Feb .27, 2018
源于灿瑞 磁传天下