G5104 Global Mixed-mode Technology Inc. 300mA Alkaline Boost DC/DC Converters in SOT-23-5 Features General Description Configurable Output Voltage Up to 5.5V 40µA Quiescent Current <1µA Shutdown Current <1µA Shutdown Pin Current Supply Range from 1.7V to 5.5V Low VDS(on): 120mV (ISW=400mA) Tiny SOT-23-5 Package The G5104 boost converter is designed for 3.3V/5V powered system. Due to a typical 40µA quiescent current and 1.7V~ 5.5V supply voltage range, it is suitable for battery powered portable applications. Such as PDAs and Handheld Computers. When the IC sets to shutdown mode, it only consumes less than 1µA. Applications Furthermore, the 500mA current limit, 450ns fixed minimum off-time and tiny SOT23-5 package facilitates the use of smaller inductor and other surface-mount components to minimize the PCB size in those space-conscious applications. Personal Digital Assistants (PDAs) Handheld Computers Digital Still Cameras Cellular Phones WebPad Local 3V to 5V Conversion To control the IC, no other external current is needed for the shutdown pin. It typically consumes less than 1µA of full supply range. Ordering Information ORDER NUMBER ORDER NUMBER (Pb free) MARKING TEMP. RANGE PACKAGE G5104T11U G5104T1Uf 5104X -40°C ~ +85°C SOT-23-5 Note:T1: SOT-23-5 U: Tape & Reel Pin Configuration Typical Application Circuit 4.7µH 5V 300mA VIN 3V SW 1 5 VCC VCC SW 10pF (option) 1M GND 2 G5104 G5104 G963 47µF 4 FB 3 SHDN 47µF FB SHDN GND 316k SOT-23-5 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 1 G5104 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Junction Temperature ......….......….......….........+125°C Storage Temperature…………......……-65°C to +150°C Reflow Temperature (Soldering, 10 sec)…….…+260°C SW to GND………………………….……….-0.3V to +7V FB to GND…………… ……………………....-0.3V to VCC VCC, SHDN to GND...........................….....-0.3V to +7V Operating Temperature Range (Note 1) -40°C to +85°C Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device. Electrical Characteristics (VCC = 3.6V, V SHDN = 3.6V, TA = 25°C) PARAMETER CONDITIONS MIN TYP MAX UNITS 1.7 ----- --40 0.1 5.5 80 1 V µA µA 1.18 1.2 1.22 V --------- -0.05 --450 120 --1 --160 %/V µA ns mV Switch Current Limit 400 500 600 mA SHDN Pin Current --- 0.1 1 µA SHDN Input Voltage High 0.9 --- --- V SHDN Input Voltage Low --- --- 0.25 V --- 0.01 5 µA Input Voltage Range Not Switching V SHDN = 0V Quiescent Current FB Comparator Trip Point Output Voltage Line Regulation FB Pin Bias Current (Note 2) Switch Off Time Switch VDS(ON) 2.5V<VIN<5.5V VFB = 1.2V ISW = 0.4A Switch Leakage Current Switch Off, VSW = 7V Note 1: The G5104 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 2: Bias current flows into the FB pin. Block Diagram L1 VOUT VIN C2 C1 BIAS VOUT C3 (option) R1 FB + SW SHDN VCC SHUTDOWN LOGIC PUMP CONTROL OC DRIVER COMP ERROR COMP en_sw + TOFF PULSE CONTROL R2 1.2V VREF GND TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 2 G5104 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VCC=+3V, V SHDN =+3V, L=4.7µH, TA=25°C, unless otherwise noted.) Feedback Voltage vs. Temperature 1.5 1.2 1.2 Feedback Voltage (V) Feedback Voltage (V) Feedback Voltage vs. Input Voltage 1.5 0.9 0.6 0.3 0.9 0.6 0.3 0 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 -40 6 -20 0 20 40 60 80 100 Temperature (°C) Input Voltage (V) RDS_on vs. Temperature RDS_on vs. Input Voltage 600 400 300 RDS_on (mΩ) RDS_on (mΩ) 500 400 300 200 200 100 100 0 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 -40 -20 Current Limit vs. Input Voltage 20 40 60 80 100 Current Limit vs. Temperature 800 600 700 Current Limit (mA) 500 Current Limit (mA) 0 Temperature (°C) Input Voltage (V) 400 300 200 100 600 500 400 300 200 100 0 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 -40 Input Voltage (V) -20 0 20 40 60 80 100 Temperature (°C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 3 G5104 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Efficiency vs. Input Voltage Efficiency vs. Output Current 90 90 85 85 80 80 VIN=4.2V Efficiency (%) Efficiency (%) VIN=3.0V 75 70 65 VIN=2.4V 75 VIN=3.6V VIN=1.7V 70 65 VO=5V, IO=100mA 60 60 1.5 2 2.5 3 3.5 4 0.1 4.5 1 10 100 1000 Output Current (mA) Input Voltage (V) Load Transient Line Transient TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 4 G5104 Global Mixed-mode Technology Inc. Pin Description PIN NAME 1 2 SW GND 3 FB 4 SHDN 5 VCC FUNCTION Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor. Ground. Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Block Diagram): R1 = R2 VOUT -1 1.2 Active-Low Shutdown Pin. Tie this pin to logic-high to enable the device or tied it to logic-low to turn this device off. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. Function Description delay time. During this time, the inductor current exceeds the current limit by a small amount. The formula below can calculate the peak inductor current. The G5104 is a boost converter with a NMOS switch embedded (refer to Block Diagram). The boost cycle is getting started when FB pin voltage drop below 1.2V as the NMOS switch turns on. During the switch on period, the inductor current ramps up until 500mA 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 charges output capacitor and the output voltage is boosted up. This pumping mechanism continues cycle by cycle until the FB pin voltage exceed 1.2V and entering the none switching mode. IPEAK = ILIM + Where VSAT = 0.2V (switch saturation voltage). When the systems with high input voltages and uses smaller inductance value, the current overshoot will be most apparent. This overshoot can be useful as it helps increase the amount of available output current. To use small inductance value for systems design, the current limit overshoot can be quite high. Even if it is internally current limited to 500mA, the power switch of the G5104 can operate larger currents without any problem, but the total efficiency will suffer. The IPEAK is keep below 700mA for the G5104 will be obtained best performance. Applications Information Choosing an Inductor There are several recommended inductors that work well with the G5104 in Table 1. Use the equations and recommendations in the next few sections to find the proper inductance value for your design. Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used at the output to minimize the output ripple voltage and the peak-to-peak transient voltage. Multilayer ceramic capacitors (MLCC) are the best choice, as they have a very low ESR and are available in very small packages. Their small size makes them a good match with the G5104’s SOT-23 package. If solid tantalum capacitors (like the AVX TPS, Sprague 593D families) or OS-CON capacitors are used, they will occupy more volume than a ceramic ones and the higher ESR increases the output ripple voltage. Notice that use a capacitor with a sufficient voltage rating. A low ESR surface-mount ceramic capacitors also make a good selection for the input bypass capacitor, which should be placed as close as possible to the G5104. A 47µF input capacitor is sufficient for most applications. Table 1. Recommended Inductors PART LQH3C4R7 LQH3C100 LQH3C220 972AS-4R7M 972AS-100M A914BYW-4R7 M A914BYW-100M VALUE(µH) MAX DCR (Ω) 4.7 10 22 4.7 10 4.7 10 0.26 0.30 0.92 0.22 0.48 0.072 0.125 VIN(MAX ) − VSAT x 100ns L VENDOR Murata www.murata.com TOKO www.toko.co.jp Current Limit Overshoot The G5104 use a constant off-time control scheme, the power switch is turned off after the 500mA current limit is reached. When the current limit is reached and when the switch actually turns off, there is a 100ns TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 5 G5104 Global Mixed-mode Technology Inc. Diode Selection For most G5104 applications, the high switching frequency requires a high-speed rectifier Schottky diodes, such as the VISHAY SS12 (1A, 20V) with their low forward voltage drop and fast switching speed, are recommended. Many different manufacturers make equivalent parts, but make sure that the component is rated to operate at least 0.5A. To achieve high efficiency, the average current rating of the Schottky diodes should be greater than the peak switching current. Choose a reverse breakdown voltage greater than the output voltage. ramping up the inductor current, then delivering that current to the load. To use low ESR capacitors will help minimize the output ripple voltage, but proper selection of the inductor and the output capacitor also plays a big role. If a larger inductance value or a smaller capacitance value is used, the output ripple voltage will increase because the capacitor will be slightly overcharged each burst cycle. To reduce the output ripple, increase the output capacitance value or add a 10pF feed-forward capacitor in the feedback network of the G5104 (see the circuits in the Typical Applications section). To add this small, inexpensive 10pF capacitor will greatly reduce the output voltage ripple. Lowering Output Voltage Ripple The G5104 supplies energy to the load in bursts by Typical Applications Boost Converter L1 4.7µH LED Driver VIN 2.5V to 4.2V VIN 2.7V to 4.2V 5V 300mA VCC VOUT C1 C2 up to 9 LEDs SW G5104 SHDN C1 47µF D1 L1 D1 R1 1M G5104 FB GND R2 316k SW VCC C2 47µF PWM Dimming L1: MURATA LQH3C4R7M24 D1: VISHAY SS12 SHDN FB GND RS C1: MLCC 4.7µF 6.3V C2: MLCC4.7µF 35V L1: MURATA LQH3C4R7M24 D1: MOTOROLA MBR0540 D2: RB751V RS: 60Ω 1% M1: FDN337N TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 6 G5104 Global Mixed-mode Technology Inc. Package Information C D L E H θ1 e1 e A A2 A1 b Note: 1. 2. 3. 4. Package body sizes exclude mold flash protrusions or gate burrs Tolerance ±0.1000 mm (4mil) unless otherwise specified Coplanarity: 0.1000mm Dimension L is measured in gage plane SYMBOL MIN DIMENSIONS IN MILLIMETER NOM MAX A 1.00 1.10 1.30 A1 A2 b C D E e 0.00 0.70 0.35 0.10 2.70 1.40 ----- ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.10 0.90 0.50 0.25 3.10 1.80 ----- e1 ----- 0.95 ----- H L θ1 2.60 0.37 2.80 ------ 3.00 ----- 1º 5º 9º Taping Specification PACKAGE SOT-23-5 Q’TY/BY REEL 3,000 ea Feed Direction SOT-23-5 Package Orientation 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. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Mar 01, 2005 7