SAMHOP SM6802

三合微科股份有限公司
SAMHOP Microelectronics Corp.
The information in this document is subject to change without notice.
c 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 : [email protected]
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
GENERAL DESCRIPTION
FEATURES
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.
* 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
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
LED
Number
SM6802
20mA
20mA
2
SM6803
SM6804
20mA
20mA
20mA
20mA
3
4
GENERAL APPLICATIONS
* Small Size Color LCD Backlights
* Mobile Phone, Smart Phone Keypad Backlights.
PIN ASSIGNMENTS
VDD
1
GND
2
EN/CTRL
3
5
4
LED1
LED2
VDD
1
6
LED1
GND
2
5
LED2
EN/CTRL
3
4
LED3
SM6802
SM6803
SOT-25
SOT-26 / TSOP 6
PGND
1
8
LED1
EN/CTRL
2
7
LED2
VDD
3
6
LED3
GND
4
5
LED4
SM6804
MSOP-8
Page 1
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
TYPICAL APPLICATION
Enable and Logic
Brightness Control
EN/CTRL
VDD
Li-Ion Battery
VDD
LED1
SM6804
LED2
LED3
LED4
GND
GND
ABSOLUTE MAXIMUM RATINGS
Characteristic
Input Voltage
Output Voltage
Voltage at all other pins
Maximum Junction Temperature
Symbol
Rating
Unit
VDD
-0.3 ~ 7.0
V
VLEDn
-0.3 ~ 7.0
V
-
-0.3 ~ 5.5
TJ
V
150
o
C
C
C
Storage Temperature Range
-
-40 ~ 150
o
Lead Temperature (soldering,10 seconds)
-
260
o
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
(oCW)
TA>25oC
Derating factor(mW/oC)
SOT-25
220
4.5
568
363
295
SOT-26
220
4.5
568
363
295
MSOP-8
180
5.56
695
444
361
TA<25oC
TA=70oC
TA=85oC
Power rating(mW) Power rating(mW) Power rating(mW)
Note:
Junction Temperature Calculation; TJ = TA+(PD* θJA)
PD: Power Dissipation, TA: Ambient termperature, θJA : Thermal Resistance-Junction to Ambient
The θJA numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
Page 2
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
Output Step
Control
Driver 1
LED1
Driver 2
LED2
Driver 3
LED3
Driver 4
LED4
PIN DESCRIPTION (MSOP-8)
Pin NO.
I/O
Pin Name
1
-
PGND
Function Description
Power ground.
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.
2
I
EN/CTRL
3
-
VDD
Power supply
4
-
GND
Ground
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
Symbol
Condition
Min.
Typ.
Supply Voltage
VDD
-
3
-
5
V
Output Sink Current
ILED
-
-
-
25
mA
Ta
-
-40
-
+85
C
Operating free-air
temperature range
Max.
Unit
DC ELECTRICAL CHARACTERISTICS
(VDD = 3.7V, Ta = 25oC, No Load, unless otherwise noted)
Characteristic
"H" Level
Symbol
Condition
Min.
Typ.
Max.
VIH
-
2
-
-
Input Voltage
Unit
Apply
Pin
V
"L" Level
VIL
-
-
-
0.4
"H" Level
IIH
-
-5.0
-
+5.0
"L" Level
IIL
-
-5.0
-
+5.0
Short Low Pulse Width
ts
-
9
-
30
µs
Hold Time Between Pulse
tH
-
10
-
-
µs
Long Low Pulse Width
tL
-
125
-
175
µs
Minimum Disable Low Time
td
-
480
-
-
µs
VLEDL
ILEDn=20mA
-
100
120
mV
-
-
20
-
mA
LED Sink Current Tolerance
ILEDn=20mA, Between IC
-
-
+/-5
%
LED Sink Current Deviation
Between LED1~LED4 (Note 1)
-
-
+/-3
%
IDD
-
-
400
600
µA
IDDSTBY
-
-
0.1
-
µA
Input Current
µA
LED Dropout Voltage
LED Maximum Sink Current ILEDmax
EN/CTRL
LEDn
Supply Current
VDD
Standby Supply Current
Note 1: I LEDn (max) -ILEDn (average) and ILEDn(average)-ILEDn(min)
Page 4
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
APPLICATION INFORMATION
Enable (EN/CTRL pin)
The EN/CTRL pin serves two functions. One is the enable and disable of the device the other is the output
sink current programming of the device. If the digital interface is not required the CTRL pin can be used as
a standard enable pin for the device. Pulling the CTRL pin high will enable the device beginning sink
current on LED pins. Pulling the CTRL pin to ground for a period of time > 480us will shutdown the device
reducing the shutdown cruuent to typical 0.1 uA.
This pin should not be left floating and need to be terminated.
Digital interface (EN/CTRL pin)
When power on the chip and pull high the EN/CTRL pin, the LED pins will start sink the initial sink current.
The maximum LED sink current is ILEDMAX (20mA). Pulling the EN/CTRL pin low for a period of time can
program the output sink current. When pulling the CTRL pin to "low" between 9 us to 30 us, the internal
controller decreases its output sink current by one step (1 mA). When pulling the CTRL pin to "low"
between 125us to 175us, the internal controller increases its output sink current by one step. There are
total 16 steps that control LED output sink current range from ILEDMAX down to ILEDMAX/4. Between the
"low" pulses, EN/CTRL should keep at "high" for at last 10 us.
Decrease One Step
Increase One Step
Time
9~30us
125~175us
Disable
480us
Time
Hold time
Time
10us
Time
Supply Voltage and Li-ion battery low warning
SM6802/3/4 works with supply voltage range from 3.0V to 5.0V. The white/blue LED forward voltage is in
the range of 2.9V to 3.5V at 20mA current. The supply voltage range and LED forward voltage (Vf) should
be set to fully ultilize Li-ion battery energy. For example, the maximum white LED forward voltage limit at
3.2V (@ 20mA) when Li-ion battery discharge reaches 3.275V (normally around 1%~3% power left in the
battery). When Li-ion battery voltage is lower than the preset low level, the LED current (brightness) will
start to decrease.
Page 5
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
TYPICAL OPERATION CHARACTERISTICS
Quiescent Current vs. Supply Voltage
Quiescent Current vs. Supply Voltage
Quiescent Current (uA)
Quiescent Current (uA)
300
250
200
150
100
50
0
3
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9
4
4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9
5
Supply
Voltage
(V) (V)
Supply
Voltage
ILED vs. Supply Voltage
ILED vs. Supply Voltage
25
LED Current (mA)
LED Current (mA)
20
15
10
5
0
3
3.1 3.2 3.3 3.4
3.5 3.6 3.7 3.8 3.9
4
4.1 4.2 4.3 4.4
4.5 4.6 4.7 4.8 4.9
5
Supply Voltage (V)
Supply Voltage (V)
Page 6
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
TYPICAL OPERATION CHARACTERISTICS
ILED vs. Brightness Control
LED Current (mA)
LED Current (mA)
ILED vs. Brightness Control
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
LED
StepStep
LED
ILED vs. LEDn Dropout Voltage
ILED vs. LEDn Dropout Voltage
25
LED Current (mA)
LED Current (mA
20
15
10
5
0
0.01
0.1
1
10
LEDn
Dropout
Voltage(V)
(V)
LEDn
Dropout
Voltage
Page 7
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
Unit : mm
SM6802L Surface Mount SOT-25
θ
R
D
4
E1
E
L1
5
L
b
1
2
3
C
e
L2
GAUGE PLANE
e1
A2
A1
A
θ2
y
4Xθ1
SYMBOL
MIN.
MOM.
MAX.
A
1.05
-
1.35
A1
0.05
-
0.15
A2
1.00
1.10
1.20
b
0.30
-
0.50
0.20
c
0.08
-
D
2.80
2.90
3.00
E
2.60
2.80
3.00
E1
1.50
1.60
1.70
e
0.95 BSC.
e1
1.90 BSC.
L
0.35
L1
L2
Page 8
0.45
0.55
0.60 REF
0.25 BSC.
R
0.10
-
-
y
-
-
0.10
θ
0°
-
8°
θ1
7°NOM
θ2
5°NOM
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
Unit : mm
SM6803L Surface Mount SOT-26
θ
R
D
5
1
2
4
E1
E
L1
6
L
b
3
C
e
L2
GAUGE PLANE
e1
SYMBOL
MIN.
MOM.
MAX.
A
1.05
-
1.35
A1
0.05
-
0.15
A2
1.00
1.10
1.20
b
0.30
-
0.50
c
0.08
-
0.20
D
2.80
2.90
3.00
E
2.60
2.80
3.00
E1
1.50
1.60
1.70
A2
A1
A
θ2
y
4Xθ1
e
0.95 BSC.
e1
L
1.90 BSC.
0.35
L1
L2
Page 9
0.45
0.55
0.60 REF
0.25 BSC.
R
0.10
-
-
y
-
-
0.10
θ
0°
-
8°
θ1
7°NOM
θ2
5°NOM
V.02 Jan 24,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
Unit : mm
SM6804L 8 -Pin Plastic MSOP
8
5
1
E
E1
"A"
4
0.65 BSC
0.15 TYP
0.30
D
SEATING PLANE
A1
0.25
A
A2
GAUGE PLANE
0.05
L
θ
L1
DETAIL A
SYMBOL
MIN.
MON.
MAX.
A
-
-
1.10
A1
0.00
-
0.15
A2
0.75
0.85
0.95
D
3.00 BSC.
E
4.90 BSC.
E1
L
3.00 BSC.
0.40
L1
θ
0.60
0.80
0.95 REF
0
-
8
Page 10
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
Unit : mm
SM6803T Surface Mount TSOP 6
θ
R
D
5
1
2
4
E1
E
L1
6
L
b
C
3
e
L2
e1
GAUGE PLANE
SYMBOL
MIN.
MOM.
MAX.
A2
A1
A
θ2
θ1
A
0.75
-
0.90
A1
0.00
-
0.10
A2
0.70
0.75
0.80
b
0.35
-
0.51
c
0.10
-
0.25
2.90 BSC.
D
E
2.80 BSC.
E1
1.60 BSC.
e
0.95 BSC.
e1
L
1.90 BSC.
0.37
L1
L2
Page 11
-
-
0.60 REF
0.25 BSC.
R
0.10
θ
0°
-
-
-
8°
θ1
7°NOM
θ2
5°NOM
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
Ordering Information
Package
Marking
Part Number ( Tape and Reel )
SOT-25
SM6802
SM6802
SOT-26
SM6803
SM6803
TSOP 6
SM6803T
SM6803T
MSOP 8
SM6804
SM6804
Package
Marking
Lead Free Part Number
SOT-25
SM6802L
SM6802L
SOT-26
SM6803L
SM6803L
TSOP 6
SM6803T
SM6803TL
MSOP 8
SM6804L
SM6804L
Package
Marking
Green Part Number
SOT-25
SM6802G
SM6802G
SOT-26
SM6803G
SM6803G
TSOP 6
SM6803T
SM6803TG
MSOP 8
SM6804G
SM6804G
Lead Free Information
Green Information
Page 12
V.1.0 July 12,2007