BD6079GWL Datasheet, PDF (1/41 Pages) Rohm – White LEDs Driver

Datasheet
White LEDs Driver
for up to 2LEDs in series, 5 strings
BD6079GWLç ç
˔General Description
BD6079GWL is a boost-up DC/DC type white LED driver
IC with synchronous rectification that can drive up to 10
LEDs, arranged in 1-5 strings of 2LEDs in Series, with
string LED Cathodes connected to GND.
With synchronous rectification (no external schottky diode
required) and small package, it is possible to save mount
space.
The brightness of LED can be adjusted by using PWM
pulse on EN pin. (PWM Frequency :100Hz~1600Hz)
LED current is set by resistance at ISET terminal.
˔Key Specification
˙ç Power supply voltage range:
˙ç Quiescent Current:
˙ç Switching frequency
˙ç Operating temperature range
2.3V to 5.5V
0.4µA (Typ.)
2MHz(Typ.)
-30°C to +85°C
˔Features
 Synchronous rectification Boost type DC/DC
converter
 No external schottky diode required
 1-5 strings of 2 white LEDs in series
 Boost function with 1 wire
 Brightness adjustment by external PWM pulse
 High Efficiency (87.8%(Typ.) at 115mA)
 High accuracy & good matching current driver
 Rich safety functions
 Over-voltage protection
 Output short protection
 Inductor Over Current Limit
 LED open/short protection
 Under voltage lockout
 Thermal shutdown
˔Typical Application Circuit
˔Package
UCSP50L1
W (Typ.) x D (Typ.) x H (Max.)
1.80mm x 1.40mm x 0.50mm
˔Application
This LED driver IC is applicable for various fields such as
Backlight for mobile phones, portable game machines,
door phones, audio players, portable DVD players, printer,
etc.
Torchlight and easy flash for camera of mobile phone
Portable equipment
˔Pin Configuration
1
2
3
Battery
4.7µH(Typ.)
A _VIN
ISET
D1
2.2µF
(Typ.)
VIN
PWM
EN
Serial control
NB
SW
VOUT
GND
D1
D2
D3
D4
D5
ISET
Rset
10µF
(Typ.)
ILED
B EN
NB
D2
C _GND
D5
D3
D ^SW
VOUT
D4
Top View
Figure 1. Typical Application Circuit
˓Product structureɿSilicon monolithic integrated circuitç ˓This product is not designed protection against radioactive rays.
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TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001