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OCP8136
High Efficiency Dual Color Temperature Dimming Dual-1.2A Flash
LED Driver With Separate 1-Wire Flash Dimming
General Description
The OCP8136 is a dual-channel 2MHz fixed
frequency synchronous boost converter, optimized for
maximum 2.4A(1.2A/channel) camera flash application
and maximum 1000mA (500mA/channel) movie mode
applications using high-current white LEDs in all single
cell Li-ion powered products. An adaptive regulation
method ensures the current for each LED remains in
regulation and maximizes efficiency.
The dual-channel flash LED drivers are
independent. ENM1 and ENF1 pins control channel 1
flash LED driver; ENM2 and EMF2 pins control
channel 2 flash LED driver.
Two simple logic control inputs (ENM1/2 and
ENF1/2) enable and disable flash and movie mode
operation of the OCP8136. Movie-mode and
Flash-mode current levels are independently fixed by
two separate resistors (RSETM1/2 and RSETF1/2).
For Flash mode, a default timer can be used either
to terminate a flash event or as a safety flash timer. In
flash mode, the flash LED current can be programmed
in 16 steps by the 1-wire dimming interface at ENF pin.
Two LEDs can be connected to the OCP8136.
The OCP8136 integrate an input voltage monitor
to monitor low battery conditions and can force the
LED current into movie mode.
Thermal regulation is integrated in Flash mode to
limit the ICs temperature and continuously provide the
maximum allowed output current.
The OCP8136 contain a thermal management
system to protect the device; a internal over-voltage
protection (OVP) circuitry prevents damaged to the
OCP8136 from open LED or open circuit conditions;
and a cycle-by-cycle current limit prevents damage to
the OCP8136. Built-in circuitry prevents excessive
inrush current during start-up. The shutdown feature
reduces quiescent current to less than 1.0μA.
The 2MHz switching frequency allow for the use of
tiny, low profile (1uH or 2.2uH) inductors and 4.7uF
ceramic capacitors. The device is available in 24-pin
4mmX4mm QFN package and is rated over the -40°C
to 85°C.
Features
Input Voltage Range : 2.7V to 4.8V
Separate Two Channel Control
Drives up to 1.2A Regulated Output Current
per Channel (Total 2.4A)
High Efficiency PWM Boost Converter
2.0MHz Fixed Switching Frequency
Up to 97% Efficiency with Small Inductor 1uH
Integrated Soft-Start Eliminates Inrush Current
Under Voltage Lock-Out
Thermal management and Current Scale Back
VIN Battery Voltage Sensing
Optimize Flash Current During Low Battery
Over Voltage (Open LED) Protection
LED Short Circuit Protection
Movie Mode Dimming via Maximum 10KHz
PWM Control
800mS Flash Timer Control
Cycle by Cycle Current Limit
Separate Hardware Flash and Movie Enable
Flash Mode With 1-wire Dimming
Independently Set Flash/Movie Currents
Flash Mode Current Up to 1.2A/channel
Movie Mode Current Up to 500mA/channel
Two Resistors Set Flash and Movie Current
Independently
Small Solution Size
Less than 1uA Shutdown Current
RoHS and Green Compliant
24-pin, 4mm X 4mm QFN Packages
-40to +85 Temperature Range
Applications
Camera Flashes and Movies
Cell Phones or Smart Phones
PDAs and Digital Camera
White LED Biasing
Mobil Handsets
Tablet PCs and Laptops/Netbooks
Camcorder Video Light (Movie Light)
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Ver. 1.1 Feb .27, 2018
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Pin Configuration
QFN4040-24L (Top View)
OCP8136
Figure 1, Pin Assignments of OCP8136
Typical Application Circuit
Mov ie Enable
Flash Enable
RF2 6.8K
VIN2(2.7V-4.8V) L2 1uH
VIN
CIN2
4.7uF
OUT2
VIN1(2.7V-4.8V) L1 1uH
VIN
CIN1
4.7uF
13
NC
14 SW2
15 OUT2
16
VIN1
17 PGND1
18 SW1
OCP8136
RSETM2
LED2
RSETF1
RSETM1
LED1
NC
6
5
4
3
2
1
RM2 34K
RF1 6.8K
RM1 34K
U1
D2 LED
D1 LED
OUT2
COUT2
4.7uF
OUT1
COUT1
4.7uF
Flash Enable
Mov ie Enable
OUT1
Figure 2A, Typical Application Circuit of OCP8136
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OCP8136
Pin Configuration
Pin
Name
Pin No.
QFN4040-24L
I/O
Pin Function
LED1
2 O Channel 1 flash LED pin. Connect cathode of a flash LED to GND1.
RSETM1
3
I/O
Channel 1 Movie mode current setting input. A 34kΩ resistor from RSETM1 to
GND1 sets the desired movie current available at LED1 up to 200mA current.
RSETF1
4
I/O
Channel 1 Flash mode current setting input. A 6.8kΩ resistor from RSETF1 to
GND1 sets the maximum flash current available at LED1 up to 1.0A current.
LED2
5 O Channel 2 flash LED pin. Connect cathode of a flash LED to GND2.
RSETM2
6
I/O
Channel 2 Movie mode current setting input. A 34kΩ resistor from RSETM2 to
GND2 sets the desired movie current available at LED2 up to 200mA current.
RSETF2
7
I/O
Channel 2 Flash mode current setting input. A 6.8kΩ resistor from RSETF2 to
GND2 sets the maximum flash current available at LED2 up to 1.0A current.
GND2
8 P Channel 2 Analog Ground and flash ground.
Channel 2 Movie mode enable pin. A low to high transition on the ENM2 pin
ENM2 9 I initiates movie mode current level set by RSETM2 resistor. ENM2 is a active
high control input with a internal 300kΩ resistance to GND2.
Channel 2 Flash mode 1-wire dimming interface pin. A low to high transition on
ENF2
10 I the ENF2 pin initiates flash mode current level set by RSETF2 resistor. ENF2 is
a active high control input with a internal 300kΩ resistance to GND2.
VIN2
11
P
Channel 2 Power input. Connect VIN2 to the input power supply voltage.
Connect a 4.7uF ceramic capacitor from VIN2 to GND2 as close as possible.
PGND2
12
P
Channel 2 Boost power ground pin. Connect PGND2 to GND2 at a single point
as close as possible to OCP8136.
SW2
14 O Channel 2 drain for internal NMOS and Synchronous PMOS Switches.
Channel 2 Power output of the boost converter. Connect a 4.7uF ceramic
OUT2
15 O capacitor from OUT2 to PGND2 as close as possible to the OCP8136. Connect
OUT2 to the anodes of the Flash LEDs.
VIN1
16
P
Channel 1 Power input. Connect VIN1 to the input power supply voltage.
Connect a 4.7uF ceramic capacitor from VIN1 to GND1 as close as possible.
PGND1
17
P
Channel 1 Boost power ground pin. Connect PGND1 to GND1 at a single point
as close as possible to OCP8136.
SW1
18 O Channel 1 drain for internal NMOS and Synchronous PMOS Switches.
Channel 1 Power output of the boost converter. Connect a 4.7uF ceramic
OUT1
20 O capacitor from OUT1 to PGND1 as close as possible to the OCP8136. Connect
OUT1 to the anodes of the Flash LEDs.
Channel 1 Flash mode 1-wire dimming interface pin. A low to high transition on
ENF1
21 I the ENF1 pin initiates flash mode current level set by RSETF1 resistor. ENF1 is
a active high control input with a internal 300kΩ resistance to GND1.
Channel 1 Movie mode enable pin. A low to high transition on the ENM1 pin
ENM1 22 I initiates movie mode current level set by RSETM1 resistor. ENM1 is a active
high control input with a internal 300kΩ resistance to GND1.
GND1
23 P Channel 1 Analog Ground and flash ground.
NC 1, 13, 19, 24 - Not Connected.
GND
EP P Exposed paddle (bottom). Connect EP to PGND as close as possible.
Ordering Information
OCP8136XXX
Package:
Q: QFN4040-24L
Packing:
Temperature Grade:
A: Tape & Reel D: -40~85
Part Number Driver Capability Package Type
Package Qty
Temperature Eco Plan
OCP8136QAD 2.4A or 2*1.2A QFN4040-24L 13-in reel 3000pcs/reel -4085Green
Lead
Cu
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Ver. 1.1 Feb .27, 2018
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