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Catalyst Semiconductor

CAT3612 Datasheet Preview

CAT3612 Datasheet

Programmable 300mA Camera Flash LED Driver

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CAT3612
Programmable 300mA Camera Flash LED Driver
FEATURES
„ Dual matched regulated LED channels
„ 300mA output current (150mA per channel)
„ 1-wire EZDimTM Programmable LED Current
„ 32 accurate dimming levels
„ Power efficiency up to 90%
„ Fractional pump 1x/1.5x
„ Low noise input ripple
„ Fixed High Frequency Operation 1MHz
„ “Zero” Current Shutdown Mode
„ Soft start and current limiting
„ Short circuit protection
„ Thermal shutdown protection
„ 12-lead TDFN 3mm x 3mm package
APPLICATION
„ Camera Flash
„ Cellular Phones
„ Digital Still Cameras
ORDERING INFORMATION
Part Number
Package Quantity Package
per Reel Marking
CAT3612HV2-T2 TDFN-12 3x3 2000
Green *
HAAD
Note *: Plated lead finish is Matte Tin.
For other lead finish option, please contact factory.
PIN CONFIGURATION
Top View
PRODUCT DESCRIPTION
The CAT3612 is a high-efficiency 1x/1.5x fractional
charge pump with programmable current in two LED
channels. Each channel delivers accurate regulated
current up to 150mA and make CAT3612 ideal for
driving one or two flash LEDs.
Low noise operation is achieved by operating at a
constant switching frequency of 1MHz which allows
the use of small external ceramic capacitors. The
1x/1.5x fractional charge pump supports a wide
range of input voltages from 3V to 5.5V with
efficiency up to 90%, and is ideal for Li-Ion battery
powered devices.
The EN/DIM logic input provides a 1-wire EZDimTM
interface for dimming control of the LEDs. When
enabled, pulsing the EN/DIM reduces the LED
current on each negative edge in 31 linear steps
from 150mA down to zero current.
The device is available in the tiny 12-lead thin DFN
3mm x 3mm package with a max height of 0.8mm.
TYPICAL APPLICATION CIRCUIT
12-lead TDFN 3mm x 3mm
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Note: Unused LED channel must be connected to VOUT
1 Doc. No. 5016 Rev. A




Catalyst Semiconductor

CAT3612 Datasheet Preview

CAT3612 Datasheet

Programmable 300mA Camera Flash LED Driver

No Preview Available !

www.DataSheet4U.com
CAT3612
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LED1, LED2 voltage
VOUT, C1±, C2± voltage
EN/DIM voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
6
7
VIN + 0.7V
-65 to +160
-40 to +125
300
Unit
V
V
V
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
ILED per LED pin
Total Output Current
Range
3 to 5.5
-40 to +85
0 to 150
0 to 300
Unit
V
°C
mA
mA
Typical application circuit with external components is shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6V, EN = High, ambient
temperature of 25ºC.
Symbol Parameter
Conditions
Min Typ Max
IQ Quiescent Current
1x mode, no load
1.5x mode, no load
0.5
3
IQSHDN Shutdown Current
VEN = 0V
1
ILED-ACC LED Current Accuracy
5mA ILED 150mA
±3
ILED-DEV LED Channel Matching
ROUT
Output Resistance (open loop)
(ILED - ILEDAVG) / ILEDAVG
1x mode, IOUT = 100mA
1.5x mode, IOUT = 100mA
±3
0.4
2.6
FOSC
Charge Pump Frequency
0.8 1 1.3
ISC_MAX Output short circuit Current Limit VOUT < 0.5V
60
IIN_MAX
IEN/DIM
VHI
VLO
Input Current Limit
EN/DIM Pin
Input Leakage
Logic High Level
Logic Low Level
1x mode, VOUT > 1V
350
-1
1.3
1
0.4
TSD Thermal Shutdown
165
THYS
VUVLO
Thermal Hysteresis
Undervoltage lock out (UVLO)
Threshold
20
2
Unit
mA
mA
µA
%
%
MHz
mA
mA
µA
V
V
ºC
ºC
V
Doc. No. 5016 Rev. A
2 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice


Part Number CAT3612
Description Programmable 300mA Camera Flash LED Driver
Maker Catalyst Semiconductor
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