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OCP8111A
1.0A Buck/Boost Charge Pump LED Driver
General Description
The OCP8111A is current-regulated charge pump
ideal for powering high brightness LEDs for camera
flash applications. The charge pump can be set to
regulate two current levels for FLASH and TORCH
modes.
The OCP8111A automatically switches modes
between step-up and step-down ensuring that LED
current does not depend on the forward voltage. It
switches at 1.8MHz, allowing the use of tiny
components. The supply voltage ranges from 2.7V to
5.5V and is ideally suited for all applications powered by
a single Li_Ion battery cell or three to four NiCd, NiMH,
or Alkaline battery cells.
The OCP8111A also features a very low shutdown
current (less than 1uA), an automatic soft-start mode to
limit inrush current, as well as over current, over voltage
and over temperature shutdown control.
A Low current sense reference voltage (50mV)
allows the user of small 0603 current sensing resistors.
The OCP8111A is offered in Green 10-pin DFN
package and is specified over an ambient temperature
range of -40˚C to 85˚C.
Features
Output Current up to 1.0A at VIN=4.2V
Up to 94% Efficiency in Torch Mode
Adjustable FLASH Mode Current
Minimum External Components: No Inductors
Automatic Buck/Boost Mode Switchover
Wide VIN Range: 2.7V to 5.5V
High Frequency Operation: 1.8MHz
50mV Reference for low Loss Sensing
ISD < 1μA in Shutdown
PWM Dimming Control
Automatic Soft Start Limits Inrush Current
Over Voltage Protection on Output
Over Current Protection
Over Temperature Protection
Low Input and Output Ripple and Low EMI
Ultra-low Dropout Voltage in Buck Mode
Space Saving RoHS Compliant, Lead Free
Package: 10-pin 3mm x 3mm DFN
Applications
White LED Torch/Flash for Cell Phones, DSCs,
and Camcorders
White LED Backlighting
Generic Lighting/Flash/Strobe Applications
General Purpose High Current Boost
Pin Configuration
DFN3030-10L (Top View)
Figure 1, Pin Assignments of OCP8111A
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Ver. 1.2 Feb .27, 2018
源于灿瑞 磁传天下

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OCP8111A
1.0A Buck/Boost Charge Pump LED Driver
Pin
Name
VIN
C1
C2
FLASH
EN
RSET
FB
SGND
PGND
VOUT
Pin No.
DFN3030-10L
1
2
3
4
5
6
7
8
9
10
Pin Function
Input Voltage for the charge pump. Decouple with 4.7µF or 10uF ceramic capacitor
close to the pins of the IC.
Positive input for the external flying capacitor. Connect a ceramic 1 µF capacitor
close to the pins of the IC.
Negative input for the external flying capacitor. Connect a ceramic 1 µF capacitor
close to the pins of the IC.
Logic input to toggle operation between FLASH and TORCH mode. In TORCH
mode FB is regulated to the internal 50mV reference. In FLASH mode FB
reference voltage can be adjusted by changing the resistor from RSET pin to
ground. Choose the external current sense resistor (RSENSE) based on desired
current in TORCH mode. This pin does not have an internal pull-up/pull- down; do
not leave this pin floating.
Shutdown control input. Connect to VIN for normal operation, connect to ground for
shutdown. Dont leave this pin floating.
Connect a resistor from this pin to ground. When in FLASH mode (FLASH = High)
this resistor sets the current regulation point according to the following:
VFB
= 1.26V *11.2k
RSET
(Flash Mode).
Feedback input for the current control loop. Connect directly to the current sense
resistor.
Internal ground pin. Control circuitry returns current to this pin.
Power ground pin. Flying capacitor current returns through this pin.
Charge Pump Output Voltage. Decouple with an external capacitor. At least 1 µF is
recommended. Higher capacitor values reduce output ripple.
GND Exposed Pad Exposed pad should be soldered to PCB board and connected to GND.
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP8111A
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Ver. 1.2 Feb .27, 2018
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OCP8111A
1.0A Buck/Boost Charge Pump LED Driver
Figure 2B, Two Flash LEDs Application Circuit of OCP8111A
Ordering Information
Part Number
OCP8111AVAD
Driver
Capability
1.0A
Package Type
DFN3030-10L
Package Qty
13-in reel
3000pcs/reel
Temperature Eco Plan
-4085
Green
Lead
Cu
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Ver. 1.2 Feb .27, 2018
源于灿瑞 磁传天下