Datasheet
Constant Current LED Driver
with 64 Dimming Steps for up to 4 LEDs
BD1754HFN
●General
Description
The multi-level brightness control LED works as a
constant current driver in 64 steps, so that the driving
current can be adjusted finely. BD1754HFN is best
suited to turn on LEDs that require high-accuracy LED
brightness control.
●Features
Current regulation for LED up to 4 parallels
Adjustable constant current 64 steps
High accuracy and matching of each current
channel (0.5% Typ.)
Brightness control via a single-line digital control
interface (Uni-Port Interface Control = UPIC)
●Applications
This driver can be used in various fields such as
mobile phones, portable game machines and etc.
●Key
Specification
Operating power supply voltage range: 2.7V to 5.5V
Quiescent Current:
0.1μA (Typ.)
Operating temperature range:
-30°C to +85°C
●Package
W(Typ.) x D(Typ.) x H(Max.)
HSON8
2.90mm x 3.00mm x 0.60mm
Figure 1. HSON8
●Typical
Application Circuit
Power Supply
L1
VIN
Cin
0.1µF
EN
L2
L3
L4
BD1754HFN
ISET
R
ISET
GND
120kΩ
(When ILED-max =32mA)
Figure 2. Application Circuit
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
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○This
product is not designed protection against radioactive rays
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TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
BD1754HFN
●Absolute
Maximum Ratings
(Ta = 25°C)
Parameter
Terminal voltage
Power dissipation
Operating temperature range
Storage temperature range
(*1)
Datasheet
Symbol
VMAX
Pd
Topr
Tstg
Ratings
7
630
(*1)
-30 to +85
-55 to +150
Unit
V
mW
°C
°C
This value is the measurement value when the driver is mounted on a glass epoxy board (70 mm x 70 mm x 1.6 mm).
When using the driver at Ta of 25°C or higher, the power is dissipated by approx. 5.04 mW/°C.
●Recommended
Operating Ratings
(Ta = -30°C to +85°C)
Parameter
Operating power supply voltage
Driver pin voltage range
Symbol
VIN
VDRV
Limits
Min.
2.7
0.2
Typ.
3.6
-
Max.
5.5
VIN-1.4
Unit
V
V
When Current driver power on.
Condition
●Electrical
Characteristics
(Unless otherwise specified, Ta = 25°C and VIN = 3.6 V)
Limits
Parameter
Symbol
Unit
Min.
Typ.
Max.
Quiescent current
Circuit current
[Current driver]
Maximum current
LED Current accuracy
LED Current matching
[Logic controller]
Low threshold voltage
High threshold voltage
‘H’ level input current
‘L’ level input current
EN ‘H’ time
EN ‘L’ time
EN Off time-out
VIN supply -> EN active time
EN stand-by -> VIN Off time
(*1)
Condition
EN=0V
Except LED current
Iq
IDD
-
-
0.1
1.2
1
2.0
μA
mA
ILED-max
ILED-diff
ILED-match
29.76
-
-
32.0
-
0.5
34.24
7.0
3.0
(
*
1)
mA
%
%
R
ISET
= 120kΩ
When current 16.5 mA setting
R
ISET
= 120kΩ
When current 16.5 mA setting
R
ISET
= 120kΩ
VIL
VIH
IIH
IIL
THI
TLO
TOFF
TVINON
TVINOFF
-
1.4
-
-2
0.05
0.3
1
1
0
-
-
0
0
-
-
-
-
-
0.4
-
2
-
100
100
-
-
-
V
V
μA
μA
μs
μs
ms
ms
ms
EN=VIN
EN=0V
The following formula is used for calculation:
ILED-match = {(Imax - Imin) / (Imax + Imin)} x 100
Imax = Current value in a channel with the maximum current value among all channels
Imin = Current value in a channel with the minimum current value among all channels
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TSZ22111½15½001
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TSZ02201-0G3G0C200060-1-2
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BD1754HFN
●Pin
Descriptions
No.
1
2
3
4
5
6
7
8
-
Pin Name
EN
GND
ISET
VIN
L1
L2
L3
L4
Thermal PAD
In/
Out
In
-
Out
-
In
In
In
In
-
ESD Diode
For Power
VIN
VIN
VIN
-
-
-
-
-
-
For GND
GND
-
GND
GND
GND
GND
GND
GND
-
Ground
Bias current
Power supply voltage input
Current sink for LED 1
Current sink for LED 2
Current sink for LED 3
Current sink for LED 4
Heat radiation PAD of back side
Connect to GND
Functions
Datasheet
LED enable and Brightness control signal
●Block
Diagram
L1
VIN
L2
L3
L4
EN
UPIC
6
Current
DAC
ISET
GND
Figure 3. Block Diagram
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TSZ22111½15½001
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TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
BD1754HFN
●Typical
Performance Curves
Datasheet
Ta=85℃
Ta=25℃
Ta=-30℃
Ta=-30,25,85℃
Figure 4. Quiescent Current
Figure 5. Circuit current
Ta=-30,25,85℃
Ta=-30,25,85℃
Figure 6. LED off-leakage current
Figure 7. LED output current vs. LED pin voltage
(VIN = 3.6 V, at 32 mA of LED current)
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TSZ22111½15½001
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TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
BD1754HFN
●Typical
Performance Curves - continued
Datasheet
Ta=-30,25,85℃
Ta=-30,25,85℃
Figure 8. LED output current vs. VIN
(at 32 mA of LED current)
Figure 9. LED current characteristics
(VIN = 3.6 V, differential linearity error)
Ta=85℃
Ta=-30℃
Ta=-30,25,85℃
Ta=25℃
Figure 10. LED current characteristics
(VIN = 3.6 V, integral linearity error)
Figure 11. LED current relative accuracy
(VIN = 3.6 V)
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
5/16
TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
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