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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 :
[email protected]
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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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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 θ°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* 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.
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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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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 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
.