OCP8110.pdf 데이터시트 (총 3 페이지) - 파일 다운로드 OCP8110 데이타시트 다운로드

No Preview Available !

OCP8110
500mA Buck/Boost Charge Pump LED Driver
General Description
The OCP8110 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 OCP8110 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 OCP8110 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 OCP8110 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 500mA at VIN=3.6V
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 OCP8110
Page1 - 3
Ver. 1.3 Feb .27, 2018
源于灿瑞 磁传天下

No Preview Available !

OCP8110
500mA Buck/Boost Charge Pump LED Driver
Pin
Name
VIN
C1
C2
FLASH
EN
RSET
FB
SGND
PGND
VOUT
Pin No.
DFN3030-10
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, FLASH=GND, FB pin is regulated to the internal 50mV reference. In FLASH
mode, FLASH=High, FB pin 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
= 14uA * RSET
5
(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 OCP8110
Page2 - 3
Ver. 1.3 Feb .27, 2018
源于灿瑞 磁传天下

No Preview Available !

Ordering Information
OCP8110
500mA Buck/Boost Charge Pump LED Driver
Part Number
OCP8110VAD
Package Type
DFN3030-10L
Package Qty Temperature Eco Plan
13-in reel
3000pcs/reel
-4085
Green
Lead
Cu
注:想进一步了解产品咨询,请直接点击申请样品。我们会第一时间联系您!谢谢!
Page3 - 3
Ver. 1.3 Feb .27, 2018
源于灿瑞 磁传天下