三合微科股½有限公司
SAMHOP Microelectronics Corp.
The information in this document is subject to change without notice.
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SAMHOP Microelectronics Corp. All Rights Reserved.
台北縣新店市民權路100號7樓
7F,No.100,Min-Chyuan Road, Hsintien, Taipei Hsien, Taiwan, R.O.C.
TEL: 886-2-2218-3978/2820 FAX: 886-2-2218-3320
Email : info@samhop.com.tw
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
GENERAL DESCRIPTION
The SM6802/ SM6803/ SM6804 are White/Blue
LED Driver for Li-Ion Battery Application. No
external component is required. Especially good for
use Li-ion battery powered LCD display's backlight
white LEDs. The special circuit design provides
over 90% efficiency in low noise.
The SM6802/SM6803/SM6804 is Integrated with
16-step programmable output sink current for LEDs
brightness control.
Target end applications are color LCD display,
such as mobile phone with color display, smart
phone, PDA, etc.
Device
Name
Initial LED
Sink Current
Max. LED
Sink Current
FEATURES
* No external component required.
* Programmable output current control, programming
range 25% to 100% in 16 steps for LED brightness
control.
* Initial LED sink current 20 mA
* 2channels (SOT-25), 3 channels (SOT-26/TSOP 6),
4 channels (MSOP-8) available.
* 90% efficiency
* Supply voltage range 3.0 V ~ 5.0 V
* 0.1uA standby current
LED
Number
SM6802
SM6803
SM6804
20mA
20mA
20mA
20mA
20mA
20mA
2
3
4
GENERAL APPLICATIONS
* Small Size Color LCD Backlights
* Mobile Phone, Smart Phone Keypad Backlights.
PIN ASSIGNMENTS
V
DD
GND
EN/CTRL
1
2
3
5
4
LED1
LED2
V
DD
GND
EN/CTRL
1
2
3
6
5
4
LED1
LED2
LED3
SM6802
SOT-25
SM6803
SOT-26 / TSOP 6
PGND
EN/CTRL
V
DD
GND
1
2
3
4
8
7
6
5
LED1
LED2
LED3
LED4
SM6804
MSOP-8
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V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
TYPICAL APPLICATION
EN/CTRL
V
DD
V
DD
LED1
Enable and Logic
Brightness Control
Li-Ion Battery
SM6804
LED2
LED3
LED4
GND
GND
ABSOLUTE MAXIMUM RATINGS
Characteristic
Input Voltage
Output Voltage
Voltage at all other pins
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature
(soldering,10 seconds)
Symbol
V
DD
V
LEDn
-
T
J
-
-
Rating
-0.3 ~ 7.0
-0.3 ~ 7.0
-0.3 ~ 5.5
150
-40 ~ 150
260
Unit
V
V
V
o
o
o
C
C
C
Note:
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
POWER DISSIPATION TABLE
Package
θ°JA
(
o
CW)
TA>25
o
C
Derating factor(mW/
o
C)
TA<25
o
C
TA=70
o
C
TA=85
o
C
Power rating(mW) Power rating(mW) Power rating(mW)
SOT-25
SOT-26
MSOP-8
220
220
180
4.5
4.5
5.56
568
568
695
363
363
444
295
295
361
Note:
Junction Temperature Calculation; T
J
= T
A
+(P
D
*
θ
JA
)
P
D
: Power Dissipation, T
A
: Ambient termperature,
θ
JA
: Thermal Resistance-Junction to Ambient
The
θ
JA
numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
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V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
BLOCK DIAGRAM
Current BIAS
EN/CTRL
Pulse
Control
Voltage
Reference
Driver 1
Output Step
Control
LED1
LED2
LED3
LED4
Driver 2
Driver 3
Driver 4
PIN DESCRIPTION (MSOP-8)
Pin NO.
1
I/O
-
Pin Name
PGND
Power ground.
Function Description
2
I
EN/CTRL
This pin combined enable and output sink current
programming function. Pulling this pin constantly high will
enable the device, Pulsing this pin constantly to GND will
disable the device, To pulsig this pin low will decrease or
increase the output Sink current, Please refer to the
application section for further informaiton.
Power supply
Ground
3
4
-
-
V
DD
GND
5~8
O
LED1~LED4
Output pins, connect to LED's cathode.
NOTE: Power ground and Ground pin must be short on PCB Board.
Page 3
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
RECOMMENDED OPERATING CONDITIONS
Characteristic
Supply Voltage
Output Sink Current
Operating free-air
temperature range
Symbol
V
DD
ILED
Ta
Condition
-
-
-
Min.
3
-
-40
Typ.
-
-
-
Max.
5
25
+85
Unit
V
mA
C
DC ELECTRICAL CHARACTERISTICS
(V
DD
= 3.7V, Ta = 25
o
C, No Load, unless otherwise noted)
Apply
Pin
Characteristic
"H" Level
Input Voltage
"L" Level
"H" Level
Input Current
"L" Level
Short Low Pulse Width
Hold Time Between Pulse
Long Low Pulse Width
Minimum Disable Low Time
LED Dropout Voltage
Symbol
VIH
VIL
IIH
IIL
ts
tH
tL
td
VLEDL
Condition
-
-
-
-
-
-
-
-
ILEDn=20mA
-
ILEDn=20mA, Between IC
Between LED1~LED4 (Note 1)
Min.
2
-
-5.0
-5.0
9
10
125
480
-
-
-
-
-
-
Typ.
-
-
-
-
-
-
-
-
100
20
-
-
400
0.1
Max.
-
Unit
V
0.4
+5.0
µA
+5.0
30
-
175
-
120
-
+/-5
+/-3
600
-
µs
µs
µs
µs
mV
mA
LEDn
EN/CTRL
LED Maximum Sink Current ILEDmax
LED Sink Current Tolerance
LED Sink Current Deviation
Supply Current
Standby Supply Current
IDD
IDDSTBY
%
%
µA
VDD
-
-
µA
Note 1: I LEDn (max) -ILEDn (average) and ILEDn(average)-ILEDn(min)
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V.1.0 July 12,2007
