AME Micropower Inverting DC/DC Converter AME5150 n General Description n Typical Application The AME5150 is an inverting DC/DC converter operating from 1.5V to 5.5V input voltage range. It is capable of VIN L1 10µH L2 10µH C2 0.47µF 1.5V~5.5V -15V producing up to -28V of regulated negative output voltage. Built-in current-limit and fixed off-time control scheme of AME5150 provides high efficiency over a wide range of load conditions. Low supply current, 400ns fixed off-time, small pack- IN SW CF D1 15pF AME5150 C1 4.7µF EN C3 4.7µF R2 24.9KΩ NFB GND age, and tiny external components makes AME5150 a R1 267KΩ extremely compact and high efficiency voltage biasing solution for battery-powered application. The AME5150 is available in a small SOT-25/TSOT-25 packages. Figure. 1 1-cell Li-lon to -15V inverting converter n Features R1 = l 1Ω Internal Switch VOUT − VNFB l Use Small Surface Mount Components VNFB R2 + INFB l Adjust Output Voltage up to -28V l 1.5V to 5.5V Input Voltage Range l Input under Voltage Lockout +15V 5mA D4 l 0.1 µA Shutdown Current l Internal Soft Start C4 1µF l All AME's Lead Free Products Meet RoHS Standards C5 1µF D3 VIN L1 10µH C2 0.47µF 1.5V~5.5V -15V 5mA D2 n Applications IN l Electronic Information Organizers l Palmtops l Cellular and Portable Phones l Portable Audio Systems SW AME5150 C1 4.7µF EN CF D1 15pF R1 267KΩ NFB GND R2 24.9KΩ C3 4.7µF l Various Multi-function Power Supplies Figure. 2 15V Dual output converter ± Rev.A.03 1 AME Micropower Inverting DC/DC Converter AME5150 n Function Block Diagram L1 C1 EN L2 C2 VIN IN SW + VOUT C3 D1 Enable Comp - - CL Vref VIN VOUT Adjust Current Limit + 400ns one Shot R1 Logic control (EXTERNAL) Cs NFB Driver UVLO R2 (EXTERNAL) GND Figure. 3 2 Rev.A.03 AME Micropower Inverting DC/DC Converter AME5150 n Pin Configuration SOT-25/TSOT-25 Top View 5 AME5150AEEV 4 1. SW 2. GND AME5150 3. NFB 4. EN 1 2 5. IN 3 Die Attach: Conductive Epoxy n Pin Description Pin Number Pin Name Pin Description 1 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. 2 GND Ground. Tie directly to ground plane. Output voltage feedback input. Set the output voltage by selecting values for R1 and R2 using: 3 NFB R1 = VOUT − VNFB VNFB R2 Rev.A.03 + I NFB 4 EN Enable control input, active high. The enable pin is an active high control. Tie this pin above 1.5V to enable the device. Tie this pin below 0.4V to turn off the device. 5 IN Analog and Power input. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. 3 AME Micropower Inverting DC/DC Converter AME5150 n Ordering Information AME5150 x x x x xxx x Special Feature Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration Pin Configuration A (SOT-25) (TSOT-25) 1. SW 2. GND 3. NFB 4. EN 5. IN Operating Ambient Temperature Range E: -40OC to +85OC Package Type E: SOT-2X Number of Pins Output Voltage Special Feature V: 5 ADJ: Adjustable Z: Lead free Y: Lead free & Low profile n Ordering Information Part Number Marking* Output Voltage Package Operating Ambient Temperature Range AME5150AEEVADJZ BISww ADJ SOT-25 -40OC to +85OC AME5150AEEVADJY BISww ADJ TSOT-25 -40OC to +85OC Note: ww represents the date code and pls refer to Date Code Rule on Package Dimension. * A line on top of the first letter represents lead free plating such as BISww. Please consult AME sales office or authorized Rep./Distributor for the availability of package type. 4 Rev.A.03 AME Micropower Inverting DC/DC Converter AME5150 n Absolute Maximum Ratings Parameter Symbol Maximum Unit VIN 6 V EN,VNFB VIN V SW Voltage VSW VOUT + 0.3 V N-Channel Switch Sink Current ISW 600 mA Input Supply Voltage EN, NFB Voltages B* ESD Classification Caution: Stress above the listed absolute rating may cause permanent damage to the device. * HBM B: 2000~3999V n Recommented 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 Symbol Maximum θ JC 81 Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Unit o SOT-25 TSOT-25 Conductive Epoxy Internal Power Dissipation Solder Iron (10Sec)** θJA 260 PD 400 350 C/W mW o C * Measure θJC on backside center of molding compund if IC has no tab. ** MIL-STD-202G 210F Rev.A.03 5 AME Micropower Inverting DC/DC Converter AME5150 n Electrical Specifications VIN = 3.6V, EN = VIN, TA = 25oC, CIN = 4.7µF, IL = 0A, unless otherwise noted. Parameter Input Voltage Test Condition VIN Min Typ 1.5 Max Units 5.5 V Quiescent Current IQ VIN = 2V, VNFB = -1.3V 65 90 µA Shutdown Current ISD EN = 0V 0.1 1 µA -1.23 -1.255 V Feedback Trip Point VNFB Feedback Hysteresis VNFB Hysteresis Switch Current Limit ICL NFB Pin Bias Current INFB Switch RDSON Switch Off Time Input Undervoltage Lockout EN Input Threshold (High) (Enable the device) EN Input Threshold (Low) (Shutdown) 6 Symbol RDSON -1.205 5 300 VNFB = -1.23V 0.6 mV 375 450 mA 2 2.7 µA 1 1.4 Ω t OFF 400 UVLO 1.2 nS 1.4 V 1.5 EN Threshold V 0.4 Rev.A.03 AME AME5150 Micropower Inverting DC/DC Converter n Detailed Description The AME5150 features a constant off-time control scheme. Operation can be best understood by referring to Figure 3. When the voltage at the NFB pin is larger than -1.23V, the Enable Comp in Figure 3 enables the device and the NMOS switch is turned on, pulling the SW pin to ground. When the NMOS switch is on, load current is supplied by the output capacitor C3. Once the current in the inductor reaches the peak current limit, the 400ns One Shot turns off the NMOS switch. During this time the energy stored in the inductor is transferred to C3 and the load. After the 400ns off-time the NMOS switch is turned on and energy is stored in the inductor again. This energy transfer from the inductor to the output causes a stepping effect in the output ripple. This cycle is continued until the voltage at NFB pin reaches -1.23V. When NFB pin reaches this voltage, the enable comparator then disables the device turning off the NMOS switch and reducing the quiescent current of the device to 65µA. The load current is then supplied solely by C3 indicated by the gradually decreasing voltage at the output. When the NFB pin drops slightly below -1.23V, the enable comparator enables the device and begins the cycle as described previously. The EN pin can be used to turn off the AME5150 and reduce the quiescent current to 0.1µA. Rev.A.03 7 AME Micropower Inverting DC/DC Converter AME5150 n Typical Application VIN L1 10µH 1.5V~5.5V IN C2 0.47µF SW AME5150 C1 4.7µF EN D2 CF D1 15pF -15V R1 267KΩ NFB GND R2 24.9K Ω C3 4.7µF Figure. 4 1-cell Li-lon to -15V inverting charge pump converter 8 Rev.A.03 AME Micropower Inverting DC/DC Converter AME5150 Efficiency vs. Loading Switch off Time vs. Temperature 80 700 VIN = 4.2V VIN = 3.6V 650 Switch Off Time (ns) Efficiency (%) 75 VIN = 2.7V 70 65 60 V OUT = -15V 55 600 550 500 450 400 350 1 2 3 4 5 6 7 8 9 101112 13141516171819202122232425 26 300 -40 -20 0 Load Current (mA) 20 40 60 80 100 80 100 Temperature (oC) INFB vs. Temperature IQ vs. Temperature 90 2.7 2.5 80 2.3 70 IQ (µA) INFB (µA) 2.1 1.9 1.7 60 50 1.5 1.3 40 1.1 0.9 -40 -20 0 20 40 60 30 -40 100 80 -20 Temperature ( C) 1.5 1.4 1.4 1.3 1.3 1.1 1.0 0.9 0.8 0.7 60 1.2 1.1 1.0 0.9 0.8 0.7 0.5 0.5 Rev.A.03 40 0.6 0.6 0.4 -40 20 EN Threshold Low vs. Temperature 1.5 EN Threshold (V) EN Threshold (V) EN Threshold High vs. Temperature 1.2 0 Temperature ( oC) o -20 0 20 40 60 Temperature ( oC) 80 100 0.4 -40 -20 0 20 40 60 Temperature (oC) 80 100 9 AME Micropower Inverting DC/DC Converter AME5150 RDSON vs. Temperature VNFB vs. Temperature 1.5 1.25 1.4 1.3 1.24 1.23 1.1 VNFB (V) R DSON (Ω) 1.2 1.22 1.0 0.9 1.21 0.8 1.20 0.7 1.19 0.6 0.5 -40 -20 0 20 40 60 80 1.18 -40 100 Temperature (oC) 0 20 40 60 80 100 Temperature (oC) Switch Current Limit vs. Temperature UVLO vs. Temperature 1.50 600 Switch Current Limit (mA) 1.45 1.40 1.35 UVLO (V) -20 1.30 1.25 1.20 1.15 1.10 550 500 450 400 350 300 250 1.05 1.00 -40 -20 0 20 40 60 o Temperature ( C) 10 80 100 200 -40 -20 0 20 40 60 80 100 Temperature (oC) Rev.A.03 AME Micropower Inverting DC/DC Converter AME5150 n Date Code Rule Marking Date Code Year A A A W W xxx0 A A A W W xxx1 A A A W W xxx2 A A A W W xxx3 A A A W W xxx4 A A A W W xxx5 A A A W W xxx6 A A A W W xxx7 A A A W W xxx8 A A A W W xxx9 n Tape and Reel Dimension SOT-25 P W AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Rev.A.03 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size SOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm 11 AME Micropower Inverting DC/DC Converter AME5150 n Tape and Reel Dimension TSOT-25 P W AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size 12 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size TSOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm Rev.A.03 AME Micropower Inverting DC/DC Converter AME5150 n Package Dimension SOT-25 Top View Side View SYMBOLS D MILLIMETERS MIN θ1 1.20REF E H A PIN 1 L S1 0.0472REF 0.15 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 1.90 BSC e θ1 2.60 0.07480 BSC 3.00 0.37BSC 0 o 10 0.10236 0.11811 0.0146BSC o 0o 10o 0.95BSC 0.0374BSC MILLIMETERS INCHES S1 A1 A MAX 0.00 L Front View MIN A1 H e MAX INCHES b TSOT-25 Top View Side View SYMBOLS D MIN MAX MIN MAX A+A1 0.90 1.25 0.0354 0.0492 b 0.30 0.50 0.0118 0.0197 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 E H θ1 PIN 1 L H S1 e 1.90 BSC e 2.40 θ1 0 o 10 0.95BSC 0.09449 0.11811 0.0138BSC o 0 o 10 o 0.0374BSC b Rev.A.03 A1 A S1 3.00 0.35BSC L Front View 0.07480 BSC 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. , November 2008 Document: 1231-DS5150-A.03 Corporate Headquarter AME, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan, R.O.C. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989