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Global Mixed-mode Technology Inc.
G5114/G5116/G5118
High Efficiency, Constant Current Output for 8 Series LEDs Driver
Features
Driving Up to 8 LEDs Auto Trigger/Release OVP Function (G5114/G5118) Input Voltage Range: 1.7V ~ 6.5V Precise Dimming Control Using PWM Signal 50A No Switching Current Internal 30V Switch With 0.8 Rds(on) Soft Start Function Included Up to 85% Efficiency
General Description
The G5114/G5116/G5118 are high efficiency boost converters with constant current output that drives up to 8 white LEDs. The continuous LED current is set with the FB pin regulated voltage across an external sense resistor (Rs) connected from that pin to ground. A dimming PWM waveform to SHDN pin controls LED average current proportional to its duty makes the brightness of LEDs also proportional to the duty. Low FB regulation voltage and low switch turned on resistance result in high converting efficiency from wide battery voltage range to high LED series voltage. An over-voltage protection prevents device damage while LEDs is open. It is easy to release protection state by just put the load path closed.
Applications
White LED Backlight Display for PDA Pocket PC Smart Phones Handheld Devices Cellular Phones
Ordering Information
ORDER NUMBER
G5114T1U G5116T1U G5118P8U
ORDER NUMBER (Pb free)
G5114T1Uf G5116T1Uf G5118P8Uf
MARKING
5114X 5116X G5118
TEMP. RANGE
-40C ~ +85C -40C ~ +85C -40C ~ +85C
PACKAGE
SOT-23-5 SOT-23-5 MSOP-8
Pin Configuration
Typical Application Circuit
SW
1
5 VCC
GND 2 FB 3
G5114
4 OVP SOT-23-5
VIN 2.7V to 4.2V VIN L1 D1 VOUT SW OVP C2 1F/ 35V 8 LEDs
SW 1 GND 2 FB 3 SOT-23-5
5 VCC
4.7F/ 6.3V
C1
G5116
PWM Dimming Waveform
G5118
SHDN GND FB RS
4 SHDN
VCC 1 PGND 2
8 SW 7 AGND
G5118
N.C. 3 OVP 4 MSOP-8L 6 FB 5 SHDN
Ver: 1.1 Sep 13, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
SW, OVP to GND..................................-0.3V to +35V VCC, SHDN to GND.................................-0.3V to +7V FB to GND..................................................-0.3V to VCC Operating Temperature..........................-40C to 85C
G5114/G5116/G5118
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=V SHDN =3.6V, TA=25C, unless specified) PARAMETER
Input Voltage Range OV Protection Threshold OV Pin Input Current Quiescent Current FB Comparator Trip Point Switch Off Time Switch RDS(ON) Switch Leakage Current Switch Current Limit VFB = 0V ISW = 150mA Switch Off, VSW = 30V G5114/G5118, Trigger G5114/G5118, Release G5114/G5118, Vovp = 28V VFB = 0.3V V SHDN = 0V
CONDITION
MIN
1.7 28 --------242 ------320 0.9 ---
TYP
--29 --10 50 2.4 250 400 0.8 0.1 400 -----
MAX
6.5 30 25 15 100 3 258 --1.2 5 480 --0.25
UNIT
V V V A A A mV ns A mA V V
SHDN Pin Voltage High SHDN Pin Voltage Low
Note.1:The G5114/G5116/G5118 are guaranteed to meet performance specifications from 0C~85C. Specifications over the -40C~85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Block Diagram
L1 VIN C1 VCC SHDN C2 D1 VOUT
*
SW
OVP**
BIAS VOUT LED Series FB R2 +
SHUTDOWN LOGIC PUMP CONTROL OC DRIVER COMP en_sw + TOFF PULSE CONTROL
CTRL
ERROR COMP
0.25V
VREF
GND
* SHDN pin only availiable for G5116/G5118 ** OVP pin only availiable for G5114/G5118
Ver: 1.1 Sep 13, 2004
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VCC = +3.6V, V SHDN = +3.6V, L=10H, TA=25C, unless otherwise noted)
G5114/G5116/G5118
Efficiency vs. Output Current
90 85 90
Efficiency vs. Input Voltage
85
VIN=4.2V Efficiency (%)
IO=20mA
Efficiency (%)
80 75 70 65 60 0 5 10
VIN-3.6V VIN=2.7V
80 75 70 65 60
6LEDs, CO=1F
15 20 25
6LEDs, CO=1F
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Load Current (mA)
Input Voltage (V)
SW RDS_on vs. Input Voltage
1.5 1.25 1.5 1.25
SW RDS_on vs. Temperature
SW RDS_on ( )
1 0.75 0.5 0.25 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
SW RDS_on ( )
1 0.75 0.5 0.25 0 -40 -20 0 20 40 60 80 100
Input Voltage (V)
Temperature (C)
Current Limit vs. Input Voltage
500 400 300 200 100 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 600 500
Current Limit vs. Temperature
Current Limit (mA)
Current Limit (mA)
400 300 200 100 0 -40 -20 0 20 40 60 80 100
Input Voltage (V)
Temperature (C)
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (Continued)
OVP Trigger Threshold vs. Input Voltage
31
G5114/G5116/G5118
OVP Trigger Threshold vs. Temperature
35
OVP Trigger Threshold (V)
OVP Trigger Threshold (V)
34 33 32 31 30 29 28 27 26 25 -40 -20 0 20 40 60 80 100
30
29
28
27
26 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
Input Voltage (V)
Temperature (C)
OVP Release Threshold vs. Input Voltage
24
OVP Release Threshold vs. Temperature
30
OVP Release Threshold (V)
OVP Release Threshold (V)
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
29 28 27 26 25 24 23 22 21 20 -40 -20 0 20 40 60 80 100
23.5
23
22.5
22
Input Voltage (V)
Temperature (C)
LED Current vs. Input Voltage
30 25 25
LED Current vs. Duty Cycle
6LEDs
6LEDs
CO=0.1F
20
LED Current (mA)
20 15 10 5 0 1.5 2 2.5 3 3.5 4
CO=1F
LED Current (mA)
CO=0.1F
15
10
CO=1F
5
0 4.5 5 5.5 6 6.5 0 10 20 30 40 50 60 70 80 90 100
Input Voltage (V)
Duty Cycle (%)
Ver: 1.1 Sep 13, 2004
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (Continued)
Efficiency vs. Output Current
90 85
G5114/G5116/G5118
PWM Dimming
VIN=4.2V
Efficiency (%)
80 75 70 65 60 0 5 10 15 20 25
VIN=3.0V
VIN=3.6V
8LEDs, CO=1F
Load Current (mA)
OVP Waveform
G5118 Inrush Current Waveform
Ver: 1.1 Sep 13, 2004
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Global Mixed-mode Technology Inc.
Pin Description
PIN G5114
SOT-23-5 1 2 3
G5114/G5116/G5118
FUNCTION
G5116
SOT-23-5 1 2 3 4
G5118
MSOP-8 8 2 7 6 5
NAME
SW PGND AGND FB
SHDN
4 5 5
4 1
OVP VCC
Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor. Power Ground Pin. Analog Ground Pin. Feedback Pin. Active Low Shutdown Pin. Tie this pin to logical high to enable the device or tied it to logical low to turn this device off. Internal 1.5M pulled high. Over Voltage Protection Sense Pin. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.
Function Description
Operation The G5114/G5116/G5118 are boost converters with NMOS switch embedded. They operate in a PFM scheme with constant peak current control. The operation frequency is up to 1MHz and is determined by the current limit, inductor value, input voltage and minimum off time. The boost cycle is started when FB pin voltage drop below 0.25V as the NMOS switch turns on. During the switch on period, the inductor current ramps up until 400mA current limit is reached. Then turns the switch off, while the inductor current flows through external schottky diode, and ramps down to zero. During the switch off period, the inductor current provides for load current and also charges output capacitor. It makes the LED current higher and results in larger voltage drop on sense resistor Rs. The cycle stop when FB pin voltage is above 0.25V. The current limit function acts as an inherent soft start by controlling the inrush current. PWM Dimming To control the brightness of the LEDs, use a low frequency PWM waveform to turn G5116/G5118 on for duty 0%~100%. How bright the LEDs at 100% duty are determined by sense resistor Rs. Overvoltage Protection (OVP) OVP is designed to prevent the damage of internal NMOS switch in case the increased impedance of the LED load (include the LED opened). Once the device detects over voltage at the output, the internal NMOS switch is kept off until the output voltage drops below 25V.
Applications Information
Inductor Selection The PFM peak current control scheme of the G5114/ G5116/G5118 is inherently stable. The inductor value does not affect the stability of the regulator. The selected inductor must have a saturation current that meets the maximum peak current of the converter. Another important inductor parameter is the DC resistance. The lower DC resistance has the higher the efficiency of the converter. Table 1. Recommended Inductors PART
LQH32CN100K1 1 972AS-100M 960AW-100M 10 10 0.48 0.18 TOKO TOKO
VALUE(H) MAX DCR () VENDOR
10 0.39 MURATA
Output Capacitor Selection For better output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low ESR value, but depending on the application, tantalum capacitors can be used. The selection of the output capacitor value directly influences the output voltage ripple of the converter which also influences line regulation. The larger output voltage ripple, the larger line regulation, which means that the LED current changes if the input voltage changes. If a certain change in LED current gives a noticeable change in LED brightness, depends on the LED manufacturer and on the application. Applications requiring good line regulation 1%/V (TYP) must use output capacitor values 1F.
Ver: 1.1 Sep 13, 2004
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Global Mixed-mode Technology Inc.
Table 2. Recommended Output Capacitors PART
UMK212BJ104MG GMK316BJ105KL GMK316F475ZG
G5114/G5116/G5118
VALUE (F)
0.1 1 4.7
VOLTAGE RATING (V)
50 35 35
VENDOR
Tayo Yuden Tayo Yuden Tayo Yuden
Setting The LED Current The Converter regulates the LED current by regulating the voltage across the current sense resistor (RS). The voltage across the sense resistor is regulated to the internal reference voltage of V(FB)=250mV. The LED Current can be calculated: ILED = VFB RS = 0.25V RS
Input Capacitor Selection For good input voltage filtering the capacitor value can be increased. Low ESR ceramic capacitors are recommended. A 4.7F ceramic input capacitor is sufficient for most applications. Table 3. Recommended Input Capacitors PART
LMK212BJ105MG JMK212BJ475MG JMK212BJ106MG
VALUE (F)
1 4.7 10
VOLTATE RATING (V)
10 6.3 6.3
VENDOR
Tayo Yuden Tayo Yuden Tayo Yuden
The current programming method is used when the brightness of the LEDs is fixed or control by a PWM signal applied to the SHDN pin. When using a PWM signal on the SHDN pin, the LED brightness is only dependent on the PWM duty cycle, independent of the PWM frequency or amplitude, which simplifies the systems. Layout considerations In all switching power supplies the layout is an important step in the design, especially at high peak currents and switching frequencies. If the layout is not carefully done, the regulator might show noise problems and duty cycle jitter. The input capacitor should be placed as close as possible to the input pin for good input voltage filtering. The inductor and diode must be placed as close as possible to the switch pin to minimize noise coupling into other circuits. Since the feedback pin and network is a high impedance circuit, the feedback network should be routed away from the inductor.
Diode Selection To achieve high efficiency a Schottky diode must be used. The current rating of the diode must meet the peak current rating of the converter. Schottky diodes, with their low forward voltage drop and fast switching speed, are best match for the G5114/G5116/G5118. Table 4. Recommended Diodes PART
MBR0530
REVERSE VOLTAGE (V)
30
VENDOR
On Semiconductor
Ver: 1.1 Sep 13, 2004
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Global Mixed-mode Technology Inc.
Package Information
D
G5114/G5116/G5118
C L
E
H
e1 e
1
A A2 A1
b
SOT-23-5 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: 1.1 Sep 13, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
G5114/G5116/G5118
C
E1
E
L D 12 (4X)
A2 y b A1
A
e
MSOP-8 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
Feed Direction
Q'TY/BY REEL
3,000 ea 2,500 ea
SOT-23-5 Package Orientation
Feed Direction Typical MSOP Package Orientation
SOT-23-5 MSOP-8
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: 1.1 Sep 13, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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