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SAMHOP Microelectronics Corp.
The information in this document is subject to change without notice. c SAMHOP Microelectronics Corp. All Rights Reserved. 1007 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
VDD GND EN/CTRL
1 2 3
5 4
LED1 LED2
VDD GND EN/CTRL
1 2 3
6 5 4
LED1 LED2 LED3
SM6802 SOT-25
SM6803 SOT-26 / TSOP 6
PGND EN/CTRL VDD 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 VDD VDD 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 VDD VLEDn TJ 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 JA (oCW) TA>25oC Derating factor(mW/oC) TA<25oC TA=70oC TA=85oC
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; TJ = TA+(PD* JA) PD: Power Dissipation, TA: Ambient termperature, JA : Thermal Resistance-Junction to Ambient The 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
-
VDD 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.
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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 VDD ILED Ta Condition Min. 3 -40 Typ. Max. 5 25 +85 Unit V mA C
DC ELECTRICAL CHARACTERISTICS
(VDD = 3.7V, Ta = 25oC, 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 A +5.0 30 175 120 +/-5 +/-3 600 s s s s 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
% % A
VDD
-
A
Note 1: I LEDn (max) -ILEDn (average) and ILEDn(average)-ILEDn(min)
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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
9~30us
Time
125~175us
Time
Disable
Hold time
480us
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.
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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
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
Quiescent Current vs. Supply Voltage
Quiescent Current (uA)
Quiescent Current (uA)
Supply Voltage (V) (V) Supply Voltage
ILED vs. Supply Voltage
ILED vs. Supply Voltage
25 20
LED Current (mA)
LED Current (mA)
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)
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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
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
LED Current (mA)
LED Current (mA)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
LED Step LED Step
ILED vs. LEDn Dropout Voltage
ILED vs. LEDn Dropout Voltage
25 20
LED Current (mA)
LED Current (mA
15 10 5 0 0.01 0.1 LEDn Dropout Voltage (V) LEDn Dropout Voltage (V) 1 10
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V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
SM6802L Surface Mount SOT-25
D b
5 4
Unit : mm
R
E
1
2
3
E1
L1
C L2 GAUGE PLANE
e e1
2 A2 SYMBOL A A1 A1 y 4X1 A2 b c D E E1 e e1 L L1 L2 R y 1 2 0.10 0 0.35 MIN. 1.05 0.05 1.00 0.30 0.08 2.80 2.60 1.50 MOM. 1.10 2.90 2.80 1.60 0.95 BSC. 1.90 BSC. 0.45 0.60 REF 0.25 BSC. 7NOM 5NOM 0.10 8 0.55 MAX. 1.35 0.15 1.20 0.50 0.20 3.00 3.00 1.70 A
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L
V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
SM6803L Surface Mount SOT-26
D b
6 5 4
Unit : mm
R
E
1
2
3
E1
L1
C L2 GAUGE PLANE
e e1
2 A A2
SYMBOL A A1
MIN. 1.05 0.05 1.00 0.30 0.08 2.80 2.60 1.50
MOM. 1.10 2.90 2.80 1.60 0.95 BSC. 1.90 BSC.
L MAX. 1.35 0.15 1.20 0.50 0.20 3.00 3.00 1.70 4X1 A2 b c D E E1 e e1 L L1 L2 R y 1 2 0.10 0 0.35 0.45 0.60 REF 0.25 BSC. 7NOM 5NOM 0.10 8 0.55
A1
y
Page 9
V.02 Jan 24,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
SM6804L 8 -Pin Plastic MSOP Unit : mm
8
5
"A"
E1
1 0.30 4 0.15 TYP D
0.65 BSC
E
GAUGE PLANE
A
SEATING PLANE
A1
0.25
L L1
DETAIL A
0.05
SYMBOL A A1 A2 D E E1 L L1
MIN. 0.00 0.75
MON. 0.85 3.00 BSC. 4.90 BSC. 3.00 BSC.
A2 0.40 0 0.60 0.95 REF -
MAX. 1.10 0.15 0.95
0.80 8
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V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
PACKAGE
SM6803T Surface Mount TSOP 6
D b
6 5 4
Unit : mm
R L E1 GAUGE PLANE SYMBOL L1 C L2 MIN. 0.75 0.00 0.70 0.35 0.10 MOM. 0.75 2.90 BSC. 2.80 BSC. 1.60 BSC. 0.95 BSC. 1.90 BSC. 0.37 0.60 REF 0.25 BSC. 0.10 0 7NOM 5NOM 8 MAX. 0.90 0.10 0.80 0.51 0.25 A A1 A2 b c D E E1 e e1 L L1 L2 R 1 2
E
1
2
3
e e1
2
A1
A2
A
1
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V.1.0 July 12,2007
SAMHOP Microelectronics Corp.
WHITE / BLUE LED DRIVER FOR LI- ION BATTERY APPLICATION
Ordering Information
Package SOT-25 SOT-26 TSOP 6 MSOP 8
Marking SM6802 SM6803 SM6803T SM6804
Part Number ( Tape and Reel ) SM6802 SM6803 SM6803T SM6804
Lead Free Information
Package SOT-25 SOT-26 TSOP 6 MSOP 8
Marking SM6802L SM6803L SM6803T SM6804L
Lead Free Part Number SM6802L SM6803L SM6803TL SM6804L
Green Information
Package SOT-25 SOT-26 TSOP 6 MSOP 8
Marking SM6802G SM6803G SM6803T SM6804G
Green Part Number SM6802G SM6803G SM6803TG SM6804G
Page 12
V.1.0 July 12,2007

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