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G5116T1U

G5116T1U

  • 厂商:

    GMT(致新科技)

  • 封装:

  • 描述:

    G5116T1U - High Efficiency, Constant Current Output for 8 Series LEDs Driver - Global Mixed-mode Tec...

  • 数据手册
  • 价格&库存
G5116T1U 数据手册
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 50µA No Switching Current Internal 30V Switch With 0.8Ω 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 -40°C ~ +85°C -40°C ~ +85°C -40°C ~ +85°C PACKAGE SOT-23-5 SOT-23-5 MSOP-8 Pin Configuration Typical Application Circuit SW 1 5 VCC VCC GND 2 FB 3 G5114 4 OVP SOT-23-5 VIN 2.7V to 4.2V VIN L1 D1 VOUT SW OVP C2 1µF/ 35V 8 LEDs SW 1 GND 2 FB 3 SOT-23-5 5 VCC 4.7µF/ 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 1 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.….……………...…-40°C to 85°C G5114/G5116/G5118 Junction Temperature.......................…...................125°C Storage Temperature………....……....…..–65°C to 150°C Reflow Temperature (soldering, 10sec)……….....260°C Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device. Electrical Characteristics (VCC=V SHDN =3.6V, TA=25°C, 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 µA µA µA mV ns Ω µA mA V V SHDN Pin Voltage High SHDN Pin Voltage Low Note.1:The G5114/G5116/G5118 are guaranteed to meet performance specifications from 0°C~85°C. Specifications over the -40°C~85°C 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 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VCC = +3.6V, V SHDN = +3.6V, L=10µH, TA=25°C, 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=1µF 15 20 25 6LEDs, CO=1µF 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 ( Ω) 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 ( Ω) 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) Ver: 1.1 Sep 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 3 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=0.1µF 20 LED Current (mA) 20 15 10 5 0 1.5 2 2.5 3 3.5 4 CO=1µF LED Current (mA) CO=0.1µF 15 10 CO=1µF 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 TEL: 886-3-5788833 http://www.gmt.com.tw 4 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=1µF Load Current (mA) OVP Waveform G5118 Inrush Current Waveform Ver: 1.1 Sep 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 5 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 1.5MΩ 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(µH) MAX DCR (Ω) 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 ±1µF. Ver: 1.1 Sep 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 6 Global Mixed-mode Technology Inc. Table 2. Recommended Output Capacitors PART UMK212BJ104MG GMK316BJ105KL GMK316F475ZG G5114/G5116/G5118 VALUE (µF) 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 4.7µF ceramic input capacitor is sufficient for most applications. Table 3. Recommended Input Capacitors PART LMK212BJ105MG JMK212BJ475MG JMK212BJ106MG VALUE (µF) 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 TEL: 886-3-5788833 http://www.gmt.com.tw 7 Global Mixed-mode Technology Inc. Package Information D G5114/G5116/G5118 C L E H e1 e θ1 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 θ1 MIN 1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1º DIMENSIONS IN MILLIMETER NOM 1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5º MAX 1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9º Ver: 1.1 Sep 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 8 Global Mixed-mode Technology Inc. G5114/G5116/G5118 C E1 E L D θ 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 θ MIN. 0.81 0.00 0.76 0.28 0.13 2.90 4.80 2.90 ----0.40 ----0º 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 6º MIN. 0.032 0.000 0.030 0.011 0.005 0.114 0.189 0.114 ----0.016 ----0º 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 6º 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 9
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