Product Change Notices PCN No.:20070604 Date:06/21/2007 This is to inform you that AME5134 datasheet has been changed from Rev. A.01 to Rev. B.01. This notification is for your information and concurrence. If you require data or samples to qualify this change, please contact AME, Inc. within 30 days of receipt of this notification. If we do not receive any response from you within 30 calendar days from the date of this notification, we will consider that you have accepted this PCN. If you have any questions concerning this change, please contact: PCN Originator: Name: Amy Shen Email: [email protected] Description of Change (From): Description of Change (To): Reason for Change: Follow industrial standard. QPM018B-B AME, Inc. AME5134 n General Description High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs n Applications The AME5134 drives white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held devices. The step-up converter includes an internal 30V, low RDSON, Nchannel MOSFET switch for high efficiency and maximum battery life. l Cellular Phones l PDA, Palmtop, and Wireless Handhelds l Color Display Backlight To control LED brightness, the LED current can be pulsed by applying a single analog/PWM signal with a frequency range of 100Hz to 10 KHz to the control pin(CTRL). A separate enable input provides on/off control. Soft-start minimizes inrush current during start up. The AME5134 is available in space-saving DFN-8 (3mmx 3mmx0.85mm) package. n Features n Typical Application l Constant-Current Regulation for LED IIIumination l Internal 30V MOSFET Switch Capable of Driving 6LEDs L1 47µH VIN 2.7V to 5.5V C1 4.7µF C2 0.47µF l Small, Low-Profile External Components l 2.7V to 5.5V Input Range ON OFF l Up to 88% Efficiency Driving 6 LEDs l Precise Brightness Control Using PWM l Soft-Start to Minimize Inrush Current l DFN-8 (3mmx3mmx0.85mm) Package SW EN OV AME5134 Signal or Analog Signal l Optimized for Low Input Ripple VIN PWM OR DC Control CTRL SS R1 200KΩ C4 4700pF R2 10KΩ FB GND R3 10Ω l All AME's Lead Free Products Meet RoHS Standard Rev.B.01 C3 0.1µF 1 AME, Inc. High-Efficiency,30V Boost Converters for 2 to 6 White LEDs AME5134 n Function Block Diagram VIN EN EN VIN SW VIN VREF VREF DRIVER CTRL CTRL FB Dimming Controller Boost Controller UVP SS SS UVP OV OV GND Current limit FB UVP 2 OVER VOLTAGE COMPARATOR + - OV AME5134 Rev.B.01 AME, Inc. High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs AME5134 n Pin Configuration Top View DFN-8 (3mmx3mmx0.85mm) 8 7 6 5 AME5134AEVA 1. GND 2. IN 3. EN 4. CTRL AME5134 5. FB 6. SS 1 2 3 4 7. OV 8. SW * Die Attach: Conductive Epoxy Note : The area enclosed by dashed line represents Exposed Pad and connect to GND. n Pin Description Pin # Pin Name Pin Description 1 GND 2 IN Input-Supply Pin. 3 EN Enable Input. Ground Brightness-Control pin. Either an analog or PWM control signal can be used. The PWM signal must be between 100Hz and 10kHz, and must have an amplitude greater than 1.8V. 4 CTRL 5 FB Feedback Input. Connect to the cathode of the LED string and connect a resistor from FB to GND to set the LED current. 6 SS Soft-Start Timing-Control Input. A 0.1uF provides a soft start time of 20ms. 7 OV Over voltage Sense. Connect to a resistor-divider from the anode of the LED string to set the over voltage threshold. 8 SW Power Switch input. This is the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI. Rev.B.01 3 AME, Inc. High-Efficiency,30V Boost Converters for 2 to 6 White LEDs AME5134 n Ordering Information AME5134 x x x x xxx x - x Special Feature2 Special Feature1 Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration Pin Operating Ambient Package Configuration Temperature Range Type A (DFN-8) 1. GND 2. IN 3. EN 4. CTRL 5. FB 6. SS 7. OV 8. SW E: -40OC to 85OC V: DFN Number of Pins Output Voltage Special Feature1 A: 8 ADJ: Adjustable Z: Lead free Special Feature2 (For DFN package only) 3: 3x3x0.85(mm) (LxWxH) n Ordering Information Part Number Marking* Output Voltage Package Operating Ambient Temperature Range AME5134AEVAADJZ-3 BDQ yyww ADJ DFN-8 (3mmx3mmx0.85mm) -40OC to 85OC Note: yyww represents the date code * A line on top of the first character represents lead free plating such as BDQ. Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability. 4 Rev.B.01 AME, Inc. High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs AME5134 n Absolute Maximum Ratings Parameter Maximum VIN , FB, OV to GND -0.3 to 6.0 SW to GND -0.3 to 30 EN, CTRL, SS to GND Unit V -0.3 to (V IN + 0.3) B* ESD Classification Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device. * HBM B:2000V~3999V n Recommended Operating Conditions Parameter Symbol Rating Ambient Temperature Range TA -40 to 85 Junction Temperature Range TJ -40 to 125 Storage Temperature Range TSTG -65 to 150 Unit o C n Thermal Information Parameter Package Die Attach Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) DFN-8 (3mmx3mmx0.85mm) Conductive Epoxy Internal Power Dissipation Solder Iron(10 Sec)** Symbol Maximum θJC 17 o C/W θJA 125 o C/W PD 800 350 Unit mW o C * Measure θJC on center of molding compound if IC has no tab. O ** MIL-STD-202G 210F F Rev.B.01 5 AME, Inc. High-Efficiency,30V Boost Converters for 2 to 6 White LEDs AME5134 n Electrical Specifications VIN = 3.3V, VOV = 0V, COUT = 1µF, RSENSE = 10Ω, TA = -40oC to 85oC, unless otherwise noted. Typical values are TA = +25 oC Parameter Supply Voltage UVP Voltage UVP VIN rising or falling, 35mV hysteresis typical Not switching, VFB = 0.5V 0.33 0.65 Switching, VFB = 0V 0.44 0.9 TA = +25oC 0.1 1 TA = +85oC 1 VEN = 0V OV Threshold VOV Rising edge OV Input Bias Current IOV VOV = 1V CTRL Input Resistance RCTRL t ON Minimum Off-Time t OFF FB Threshold VFB FB Input Bias Current IFB 1.18 TA = +25oC o TA = +85 C 0 < VCTRL < 1.5V, EN = VIN VIN = 3.3V VCTRL = 1.25V 192 VCTRL = 3.3V VFB = 1.0V SW Leakage Current ISW EN Logic-Level High VEH EN Logic-Level Low VEL EN Input Current IEN 1.33 1 200 400 600 V nA kΩ ns 203 TA = +85oC 100 0.8 217 200 1.4 220 VSW = 30V TA = +25 C 0.1 VEN = 0V TA = +85oC 1 5 0.4 TA = +25oC 0.01 TA = +85oC 0.1 mV nA Ω mA 1.8 VEN = 0V to VIN µA 250 15 o mA µs TA = +25oC start up condition V 3.4 280 RDSON ICL 1.25 10 200 Units 5.5 2.65 ISD 2.35 Max 2.5 Shutdown Current Maximum On- Time Typ 2.7 IQ SW Current Limit Min VIN Quiescent Current SW On-Resistance 6 Test Condition Symbol 1 µA V µA Rev.B.01 AME, Inc. High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs AME5134 n Detailed Description The AME5134 features a minimum off-time, currentlimited control scheme. Operation can be best understood by referring to Figure 2.When the voltage at the FB pin is less than regulation threshold, NMOS switch is turned on and the inductor current ramps up to the current limit. Once the current in the inductor reaches peak current limit the NMOS switch will be turned off for 250nS, at mean time the SW voltage will rise to a voltage that equals output voltage plus a diode drop and the inductor current will begin to decrease as shown in Figure 2.During this time the energy stored in the inductor is transferred to COUT and the load. After 250ns, if the voltage at FB is above the regulation threshold, the NMOS switch stays off. If the voltage at FB is below the regulation threshold, the NMOS switch turns back on and the cycle repeats. Shutdown The AME5134 features a low-current shutdown feature. When EN is low, the IC turns off, reducing its supply current to approximately 0.1µA. For normal operation, drive EN high or connect to VIN. Soft-Start Soft-start provided on the AME5134 to minimize inrush current. The soft-start time is set with an external capacitor, C3. Use the following equation to solve for C3: C3 = tss 2 x 10 5 Where tss is the soft-start time. Overvoltage Protection A. Use a DC Signal to CTRL pin At CTRL, applying a DC signal in the range of 0V to 1.8V control the LED current. CTRL can be overdriven; however, applying a CTRL greater than 1.8V does not increase the LED current above the level at 1.8V.( See the LED Current vs. CTRL Voltage graph.) B. Use a PWM Signal to CTRL pin The CTRL input is used as a digital input allowing LED brightness control with a logic-level PWM signal applied directly to CTRL. The frequency range is from 100Hz to 10kHz, while 0% duty cycle corresponds to minimum current, and 100% duty cycle corresponds to full current. (See the LED Current vs. CTRL Duty Cycle graph.) The CTRL resistor and SS capacitor from a low pass filter, so PWM dimming results in DC current to the LEDs without the need for additional RC filters. Capacitor Selection A 0.47µF ceramic output capacitor (C2) is recommended for most applications. For circuits driving six or fewer LEDs, use a 4.7µF ceramic input capacitor (C1). For best stability over a wide temperature range, use capacitors with an X5R, X7R, or better dielectric. Inductor Selection The AME5134 has a 220mA inductor current limit and can drive up to six LEDs at 20mA.The selected inductor must have a saturation current that meets the maximum peak current of the converter. For best efficiency, the inductor's DC resistance should also be as low as possible. Diode Selection OVP is designed to prevent the output voltage from exceeding the maximum internal NMOS switch voltage rating of 30V. The peak output voltage in an overvoltageprotection event is set with a resistor-divider from the output connected to 0V (R1 and R2). Select a value for R2(10kΩ is recommended), then solve for R1 using the following equation: R1 = R2 x ( Dimming Control VOUT VOV The AME5134 high switching frequency demands a high-speed rectification diode (D1) for optimum efficiency. A Schottky diode is recommended due to its fast recovery time and low forward-voltage drop. 1) Where VOV is the overvoltage threshold, and VOUT is the desired peak output voltage. Rev.B.01 7 AME, Inc. AME5134 High-Efficiency,30V Boost Converters for 2 to 6 White LEDs Layout Considerations When laying out a board, minimize trace lengths between the IC and the inductor, diode, input capacitor, output capacitor, and R1. Keep traces short, direct, and wide. Keep noisy traces, such as the SW node trace, away from FB. Place the VIN bypass capacitor(C1) as close to the IC as possible. The ground connections of C1 and C2 should be as close together as possible. Star connect the grounds for R2, R3, C3, and the CTRL voltage supply as close to the IC as possible. 8 Rev.B.01 AME, Inc. High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs AME5134 Efficiency vs Load Current Driving 6 White LEDs Efficiency vs Load Current Driving 6 White LEDs 100 100 VIN=5V VIN=4V 80 VIN=3.3V 70 Inductor=33µH CLEDS = 4700pF 60 VIN=5V VIN=4V 90 VIN=3.6V Efficiency (%) Efficiency (%) 90 VIN=3.3V VIN=3.6V 80 70 Inductor=47µH CLEDS=4700pF 60 50 50 0 5 10 15 20 0 5 Load Current (mA) 10 15 20 Load Current (mA) Efficiency vs Load Current Driving 6 White LEDs 100 26 LED Current vs Input Voltage Driving 6 White LEDs L=47µH 90 Efficiency (%) VIN=5V 80 LED Current (mA) VIN=3.6V VIN=3V VIN=4V 70 Inductor=22µH No Capactor across LEDs 60 5 10 15 20 L=22µH L=33µH 17 14 11 2.5 50 0 23 20 3 3.5 4 4.5 5 Load Current (mA) Input Voltage (V) LED Current vs. Input Voltage LED Current vs CTRL Voltage 5.5 35 25 30 19 L=33µH L=22µH LED Current (mA) LED Current (mA) 22 L=47µH 16 13 10 7 3 3.5 4 4.5 Input Voltage (V) Rev.B.01 20 15 10 5 4 1 2.5 25 5 5.5 0 0 0.6 1.2 1.8 2.4 3 3.6 CTRL Voltage (V) 9 AME, Inc. High-Efficiency,30V Boost Converters for 2 to 6 White LEDs AME5134 Switching Waveforms VSW Switching Waveforms 10V/div VOUT 200mA/div IL 200mV/div VSW 10V/div VOUT 200VOUT IL 200VOUT 2µs/div 2µs/div Discontinuous Operation, 3.75V Li+Battery, 10mA Output L=47µH, C LEDS=4700 pF Continuous Operation, 3.75V Li+Battery, 18mA Output L=47µH, C LEDS=4700 pF CTRL Step Respone Starup/Shutdown Waveforms VEN VCTRL 5V/div 1V/div VFB 200mV/div VOUT VFB 200mV/div 20V/div VOUT 10V/div 20ms/div 40ms/div L=22µH VCTRL=0.5V to 1.25V to 0.5V L=22µH LED Current vs CTRL Duty Cycle OVP Waveforms 30 LED Current (mA) 25 20 OVP 15 10 10V/div 5 0 0 20 40 60 80 100 20ms/div CTRL Duty Cycle (%) 10 Rev.B.01 AME, Inc. High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs AME5134 Soft Start Response VEN 5V/div VFB 200mV/div C3=0.1µF 10ms/div Rev.B.01 11 AME, Inc. High-Efficiency,30V Boost Converters for 2 to 6 White LEDs AME5134 n Tape and Reel Dimension DFN-8 (3mmx3mmx0.85mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size 12 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size DFN-8 (3mmx3mmx0.85mm) 8.0±0.1 mm 4.0±0.1 mm 1000pcs 180±1 mm Rev.B.01 AME, Inc. High-Efficiency,30V Boost Converters for 2 to 6 White LEDs AME5134 n Tape and Reel Dimension DFN-8 (3mmx3mmx0.85mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size 12 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size DFN-8 (3x3x0.85mm) 8.0±0.1 mm 4.0±0.1 mm 3000pcs 330±1 mm Rev.B.01 AME, Inc. High-Efficiency, 30V Boost Converters for 2 to 6 White LEDs AME5134 n Package Dimension DFN-8 (3mmx3mmx0.85mm) D SYMBOLS MILLIMETERS MIN TOP VIEW H D2 MIN 0.900 A E MAX INCHES MAX 0.035 D 2.900 3.100 0.114 0.122 E 2.900 3.100 0.114 0.122 F 0.550 TYP. 0.220 TYP. e 0.650 TYP. 0.026 TYP. D2 1.500 TYP. 0.059 TYP. E2 2.400 TYP. 0.094 TYP. b 0.200 0.300 0.0079 0.012 L 0.450 0.550 0.018 0.022 G 0.010 0.090 0.0004 0.004 H 0.000 0.050 0.000 0.002 L b PIN 1 ID E2 e BOTTOM VIEW A G F SIDE VIEW Rev.B.01 13 www.ame.com.tw E-Mail: [email protected] Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. AME, Inc. , June 2007 Document: 1029-DS5134-B.01 Corporate Headquarter U.S.A.(Subsidiary) AME, Inc. Analog Microelectronics, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District 3100 De La Cruz Blvd., Suite 201 Taipei 114, Taiwan, R.O.C. Tel: 886 2 2627-8687 Santa Clara, CA. 95054-2438 Tel : (408) 988-2388 Fax: 886 2 2659-2989 Fax: (408) 988-2489