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Rohm Semiconductor Electronic Components Datasheet

BD6079GWL Datasheet

White LEDs Driver

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Datasheet
White LEDs Driver
for up to 2LEDs in series, 5 strings
BD6079GWL
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
Power supply voltage range:
Quiescent Current:
Switching frequency
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 structure Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product is not designed protection against radioactive rays.
1/37
TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001


Rohm Semiconductor Electronic Components Datasheet

BD6079GWL Datasheet

White LEDs Driver

No Preview Available !

BD6079GWL
Datasheet
Absolute Maximum Rating(Ta=25°C)
Parameter
Maximum applied voltage 1
Maximum applied voltage 2
Power dissipation
Symbol
VMAX1
VMAX2
Pd
Value
-0.3 to 7.0 *1
-0.3 to 10.5 *1
650 *2
Unit Condition
V VIN, EN, NB, ISET
V SW, VOUT, D1, D2, D3, D4, D5
mW -
Operating temperature range
Storage temperature range
Junction temperature
Topr
-30 to +85
°C
Tstg
-55 to +150
°C
Tjnc 150 °C
-
-
-
MM
-200 to +200
V Machine model
Electrostatic protection
HBM
-2000 to +2000
V Human body model
CDM
-1000 to +1000
V Charged device model
*1 These values are based on GND pin.
*2 50mm×58mm×1.75mm At glass epoxy board mounting. When it’s used by more than Ta=25°C, it’s reduced by 5.2mW/°C.
Recommended Operating condition Ta=25°C
Item
Power supply voltage
Min.
2.3
Value
Typ.
3.7
Max.
5.5
Unit
V
Electrical Characteristics Unless otherwise specified Ta =-30°C to +85°C, VIN=2.5 to 4.8V
Item
Symbol
Min.
Typ.
Max. Unit
[ EN, NB terminal ]
Input voltage (Low)
VthL
-
- 0.68 V
Condition
Input voltage (High)
Pull down resistor
[Consumption current]
Quiescent Current
Operating current H
[Switching regulator]
Inductor current limit
SW NMOS on resistance
SW PMOS on resistance
VthH
PDR
Ishut
IqH
Icoil
RonN
RonP
1.07 1.20
-
V
- 250 - k
- 0.4 2.0 µA EN=0V, NB=0V
EN=2.5V, NB=0V,
- 1.1 - mA Rset=18k, No switching
VOUT=7.0V, VLED*1=6.5V
VIN=3.7V
-
0.85 1.00
A This parameter is tested with
DC measurement.
- 0.4 - Inch=200mA
- 1.0 - Ipch=200mA, VOUT=7.0V
Switching frequency
Fsw - 2.0 3.0 MHz
Duty cycle limit
Duty
76.0
-
-%
Output voltage range
Vo - - 8.1 V
Over voltage limit
Ovl 8.8 9.2 9.6 V During Initial boost only.
VOUT ripple
1 VLED=D1~D5 voltage
VOUTpp
-
- 100 mV COUT=10µF
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
2/37
TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001


Part Number BD6079GWL
Description White LEDs Driver
Maker ROHM
Total Page 30 Pages
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