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Global Mixed-mode Technology Inc.
G5920/G5921
Ultra Low-Dropout, Constant-Current White LED Bias
Features
Ultra Low 150mV Dropout at 20mA 0.6% High Accuracy Current Matching 20mA Full Scale Current 32 Level Linear Current Brightness Control PWM Brightness Control 2.5V to 5.5V Supply Voltage Range SOT-23-6 Package (G5920) MSOP-8 Package (G5921)
General Description
The G5920/G5921 is a high performance ultra lowdropout constant current bias supply for white LEDs. It can be used as an alternative to the simple ballast resistors in conventional parallel white LEDs applications. Each white LED bias current is matching to 0.6%. For dimming control, an enable input pin is controlled by processor GPIO output pulses for 32 level linear current. Using a low frequency PWM waveform to this enable input pin also controls the average LED current which is proportional to the PWM duty. The G5920/G5921 is suitable for single cell Li-ion battery power device that using low forward voltage white LEDs. The white LEDs can be powered directly from battery without extra external components. This takes an advantage of highest efficiency and creates no EMI problem.
Applications
Mobile Phones White LED backlighting
Ordering Information
ORDER NUMBER
G5920TB1U G5921P8U Note:TB : SOT23-6 P8: MSOP-8 U: Tape & Reel
ORDER NUMBER (Pb free)
G5920TB1Uf G5921P8Uf
MARKING
5920x 5921x
TEMP. RANGE
-40C to 85C -40C to 85C
PACKAGE
SOT-23-6 MSOP-8
Pin Configuration
G5920
LED2 1 6 LED1
Typical Application Circuit
Linear Current Dimming EN
G5920
LED1 LED2
GND 2
5 VCC
LED3 GND VCC 0.1F VBAT
LED3 3
4 EN
SOT-23-6
G5921
LED2 LED1 VCC N.C. 1 2 3 4 8 7 6 5 GND LED4 LED3 EN
PWM Dimming EN
G5920
LED1 LED2 LED3 GND VCC 0.1F VBAT
MSOP-8
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
VCC to GND.....................................-0.3V to +7.0V EN, LED1, LED2, LED3 to GND.....-0.3V to VCC+0.3V Operating Temperature Range.................-40 to 85C
G5920/G5921
Junction Temperature...................................125C Storage Temperature........................-65C to 150C Reflow Temperature (soldering, 10sec)............260C
Stress beyond those listed under "Absolute Maximum Rating" may cause permanent damage to the device.
Electrical Characteristics
VCC = VEN = 3.6V, TA = 25C PARAMETER
Input Voltage Range Quiescent Current Shutdown Current Input Voltage UVLO Threshold Output Current Output Current Line Regulation Current Matching LED Pin Voltage Dropout EN Pin Input Voltage High EN Pin Input Voltage Low EN Pin Input Current EN Pin Off Timeout EN Pin End of Pulse Timeout EN Pin Pulse High Time EN Pin Pulse Low Time VCC IQ IQ(OFF), VEN = 0V VUVLO Max ILED VLED = 0.5V~2V VLED = 0.5V VLED(DROP), 90% Max ILED VIH VIL IEN TOFF TEOP THIGH TLOW
CONDITION
MIN
2.5 ---1 --18 -0.5 -4 --2 ---1 40 40 5 5
TYP
--180 --2 20 --0.6 --------80 80 -----
MAX
5.5 230 +1 --22 +0.5 +4 0.15 --0.8 +1 200 200 30 30
UNIT
V A A V mA %/V % V V V A S S S S
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
VCC =VEN =3.6V, VLED=0.5V, T=25C, unless otherwise noted.
PWM Diming Waveform
Vbat=4.2V EN EN
G5920/G5921
Linear Dimming Waveform I
Vbat=4.2V
ILED(20mA/div)
ILED(20mA/div)
VLED
VLED
Linear Dimming Waveform II
Vbat=4.2V EN
Input Voltage UVLO
ILED(20mA/div)
VLED
Quiescent Current vs. Temperature
250 200 150 100 50 0 -50 -25 0 25 50 75 100 Temperature (C) Quiescent Current IQ(A) 250 200 150 100 50 0 2.5
Quiescent Current vs. VCC
Quiescent Current IQ(A)
3
3.5 VCC(V)
4
4.5
5
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G5920/G5921
ILED vs. VCC
ILED vs. Temperature
20.04 20 19.96 ILED (mA) ILED(mA) 19.92 19.88 19.84 19.8 -50 -25 0 25 50 Temperature (C) 75 100 20.01 20 19.99 19.98 19.97 19.96 19.95 19.94 19.93 19.92 19.91 2.5 3
3.5 4 VCC(V)
4.5
5
ILED vs. Code
25 20 15 10 5 0 0 10 20 Code 30 40 20.20 20.15 20.10 20.05 ILED(mA) 20.00 19.95 19.90 19.85 19.80 0.5 0.8
ILED vs. VLED
ILED(mA)
1.1
1.4 VLED (V)
1.7
2
Current Match vs. Temperature
1.0
LED1 1.0
LED1
Current Match vs. Vcc
Current Match(%)
Current Match (%)
0.5
LED2
0.5
LED2
0.0
LED3
0.0
LED3
-0.5
-0.5
-1.0 -50 -25 0 25 50 Temperature (C) 75 100
-1.0 2.5 3 3.5 4 VCC (V) 4.5 5
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Current Match vs. Code
4 3 Current Match (%) Current MAtch(%) 2 1 0 -1 -2 -3 -4 0 5 10 15 20 25 30 35 Code -1.0 0.5 0.75 LED3 LED1 LED2 0.5 LED2 0.0 LED3 -0.5 1.0 LED1
G5920/G5921
Current Match vs. VLED
1
1.25 1.5 VLED (V)
1.75
2
ILED vs. Vbat
25
LED using NICHIA
20
Code=0
ILED(mA)
15
Code=8
10
Code=16
5
Code=24
0 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 Vbat(V)
Recommend Minimum Footprint
SOT-23-6 MSOP-8
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Pin Descriptions
PIN
G5920 SOT-23-6 1 2 3 4 5 6 G5921 MSOP-8 1 8 6 5 3 2 7 4
G5920/G5921
FUNCTION
NAME
LED2 GND LED3 EN VCC LED1 LED4 N.C. LED2 bias current input. Ground. LED3 bias current input. Enable Dimming control. Power supply. LED1 bias current input. LED4 bias current input. Not Connected.
Block Diagram
VBAT
0.1F
VCC
LED1
LED2
LED3
EN
Current Control
GND
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Function Description
G5920/G5921 LED pins act as well matched current source driving LED diode to ground. An EN pin is used to turn on and turn off G5920/G5921.
G5920/G5921
When applying a lower frequency (less than 2kHz) PWM waveform to EN pin, the average LED current will be duty*20mA(typical). Refer to Fig.1
ON duty
EN TEOP TOFF TEOP
ILED
ON duty 20mA (Code=0)
Fig.1 Turn ON to PWM dimming
If the application is not suitable to apply such a low frequency PWM dimming waveform, this EN pin can be negatively pulsed to set continuous LED current. When no negative pulse is input to EN pin (Code=0), the internal register will latched to set the maximum
LED current, typically 20mA. Whenever input N negative pulses to the EN pin, it will get a LED current corresponding to Code N. In this manner, LED current will changed from previous value to new value after the last pulse for typical 80s (TEOP). Please refer to Fig.2
THIGH
EN TLOW TEOP TOFF
N negative pulses Code 31 N
ILED LED current corresponding to Code N
Fig.2 Turn ON and config Code N
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
Package Information
G5920/G5921
C L
D
E
H
e1 e
1
A2 b
A A1
SOT-23-6 (TB) Package Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance 0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane SYMBOL
A A1 A2 b C D E e e1 H L 1
MIN
1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1
DIMENSIONS IN MILLIMETER NOM
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5
MAX
1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
8
Global Mixed-mode Technology Inc.
G5920/G5921
C
E1
E
L D 12 (4X)
A2 y b A1
A
e
MSOP-8 (P8) Package Note: 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. Tolerance 0.10mm unless otherwise specified 4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact. 5. Followed from JEDEC MO-137 SYMBOL
A A1 A2 b C D E E1 e L y
MIN.
0.81 0.00 0.76 0.28 0.13 2.90 4.80 2.90 ----0.40 ----0
DIMENSION IN MM NOM.
1.02 ----0.86 0.30 0.15 3.00 4.90 3.00 0.65 0.53 ---------
MAX.
1.22 0.20 0.97 0.38 0.23 3.10 5.00 3.10 ----0.66 0.10 6
MIN.
0.032 0.000 0.030 0.011 0.005 0.114 0.189 0.114 ----0.016 ----0
DIMENSION IN INCH NOM.
0.040 ----0.034 0.012 0.006 0.118 0.193 0.118 0.026 0.021 ---------
MAX.
0.048 0.008 0.038 0.015 0.009 0.122 0.197 0.122 ----0.026 0.004 6
Taping Specification
PACKAGE
SOT-23-6 MSOP-8
Feed Direction SOT- 23-6 Package Orientation Feed Direction Typical MSOP Package Orientation
Q'TY/REEL
3,000 ea 2,500 ea
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 0.4 Preliminary Feb 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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