AME AME5177 n General Description Synchronous Boost Converter With Low Quiescent Current n Typical Application The AME5177 is a high efficiency synchronous boost converter, which is based on a hysteretic controller topology using synchronous rectification to obtain maximum efficiency at minimal quiescent currents. The converter provides a power supply solution for products powered by a variety of batteries such as single-cell, dual-cell, tree-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Lipolymer battery. The output voltage is internally programmable in a range from 1.8V to 5V in increments of 0.1V. Moreover, the converter can be switched off by an enable pin to minimize battery drain. The maximum average input current is limited to 450mA for current limit. n Functional Block Diagram n Features l Very Low Start-up Voltage at 0.8V l Output Voltage Range: 1.8V~5V in 0.1V increments l Output Voltage Accuracy ± 2% l Output Currents up to 100mA l No Schottky Diode Required l Support Inductor of Multilayer Type l Typical Shutdown Current Less than 0.7uA l Typical Quiescent Current Less than 6.5uA l Over Current Protection l Over Temperature Protection l Available in SOT-25, SOT-26 and DFN-6D Package l RoHS Compliant and Halogen Free n Application l All One-Cell, Two-Cell and Three-Cell Alkaline, NiCd, NimH and Single-Cell Batteries l Wireless Mouse l Mobile-Applications l Hand-Held Devices Rev. A.01 1 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Pin Configuration DFN-6D (2mmx2mmx0.75mm) Top View 1 6 2 5 3 4 SOT-25 Top View AME5177-AVYxxx 1. NC 2. GND 3. EN 4. OUT 5. NC 6. LX 5 AME5177-AEVxxx 1. NC 2. GND 3. EN 4. OUT 5. LX 4 AME5177 1 2 3 * Die Attach: Conductive Epoxy * Die Attach: Conductive Epoxy SOT-26 Top View SOT-26 Top View 6 5 AME5177-AEYxxx 1. NC 2. NC 3. GND 4. OUT 5. LX 6. EN 4 AME5177 1 2 3 6 5 AME5177-BEYxxx 1. LX 2. GND 3. EN 4. NC 5. VOUT 6. NC 4 AME5177 1 2 3 * Die Attach: Non-Conductive Epoxy * Die Attach: Conductive Epoxy n Pin Description Pin No. SOT-25 2 SOT-26 DFN Pin Name A B 1 1, 2 4, 6 1, 5 NC 2 3 2 2 GND 3 6 3 3 EN 4 4 5 4 OUT 5 5 1 6 LX Pin Description No connect Pin. Ground. Chip Enable (Active High). Output Voltage Pin. Switch pin which connected to inductor. Rev. A.01 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Ordering Information AME5177 - x x x xxx Output Voltage Number of Pins Package Type Pin Configuration Pin Configuration A (DFN-6D) A (SOT-25) A (SOT-26) B (SOT-26) Rev. A.01 1. NC 2. GND 3. EN 4. OUT 5. NC 6. LX 1. NC 2. GND 3. EN 4. OUT 5. LX Package Type E: SOT-2X V: DFN Number of Pins V: 5 Y: 6 Output Voltage 180: 190: 200: : : 490: 500: 1.8V 1.9V 2.0V : : 4.9V 5.0V 1. NC 2. NC 3. GND 4. OUT 5. LX 6. EN 1. LX 2. GND 3. EN 4. NC 5. VOUT 6. NC 3 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Absolute Maximum Ratings Parameter Maximum Unit Input Voltage -0.3V to 7 V LX Voltage -0.3V to 7 V Output Voltage -0.3V to 7 V EN Voltage -0.3V to 7 V Electrostatic Discharge (HBM) 2000 V Electrostatic Discharge (MM) 200 V Electrostatic Discharge (CDM) 1000 V Junction Temperature 150 o Storage Temperature -65 to +150 o C C n Recommended Operating Conditions Parameter Symbol Rating VIN 0.8 to 5.5 VOUT 1.8 to 5 Junction Temperature Range TJ -40 to +125 Ambient Temperature Range TA -40 to +85 Input Voltage Output Voltage 4 Unit V o C Rev. A.01 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Thermal Information Parameter Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Package SOT-25 SOT-26 DFN-6D Die Attach Symbol Maximum θJ C TBD Unit o Non-Conductive Epoxy Internal Power Dissipation Lead Temperature ( soldering 10 sec)** θJA TBD PD TBD 260 C/W mW o C * Measure θJC on backside center of molding compound if IC has no tab. ** MIL-STD-202G 210F Rev. A.01 5 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Electrical Specifications TA = 25oC, unless otherwise noted. Parameter Symbol Test Condition VSTART-UP IOUT=1mA, VIN:02V Hold-on Voltage(V) VHOLD IOUT=1mA, VIN:2V0V Output Accuracy ∆VOUT Min Typ Max Units 0.8 0.95 V 0.7 V 2 % DC/DC Stage Minimum Input Voltage At Startup -2 VOUT=1.8V 1.8 V VOUT=2.1V 2.1 V VOUT=2.2V 2.2 V VOUT=2.7V 2.7 V VOUT=3.0V 3 V VOUT=3.3V 3.3 V VOUT=5.0V 5 V IQ VOUT x 1.2 6.5 Rectifying Switch on Resistance RDS(ON)_P VOUT=3.3V 1 Ω Main Switch on Resistance RDS(ON)_N VOUT=3.3V 1 Ω Output Voltage Quiescent Current ∆VOUT 10 µA Power MOSFET Enable Control (SOT-25 Only) EN Logic-High Voltage VIH EN Logic-Low Voltage VIL EN Input Current IEN Clamp on GND or VOUT 0.1 Shutdown Current ISD VEN=0V, VIN=1.2V IOUT=0mA 0.7 µA ISW VOUT=3.3V 450 mA NMOS Leakage Ileakage_N VOUT=3.3V 1 µA PMOS Leakage Ileakage_P VOUT=3.3V 1 µA 0.8 V 0.4 V 1 µA Protection Switch Current Limit Thermal Shutdown Temperature Thermal Shutdown Hysteresis 6 TSD ∆TSD 150 o C 20 o C Rev. A.01 AME AME5177 n Detailed Description The AME5177 is a high efficiency synchronous boost converter, which is based on a hysteretic current controller topology using synchronous rectification to obtain maximum efficiency at minimal quiescent current condition. The converter allows the use of low cost chip inductor (Support Inductor of Multilayer Type) and small ceramic input and output capacitors total only three external components. Enable Function The AME5177 has a dedicated enable pin. The device is enabled when pull the EN above 0.8V. Furthermore, the device is disabled when pull the EN below 0.4V. Over Current Limit The AME5177 provide the current limit protection function. When inductor current reaches the internal switch current limit threshold, the internal switch will be turned off. When the over current state is eliminated, the IC resumes its nornal operation. Synchronous Boost Converter With Low Quiescent Current n Application Information Inductor The Inductor is required to supply energy to the load while being driven by switched high side MOSFET. Choose inductance that will affect the period proportional to inductance. Therefore, choosing greater inductance can improve system efficiency since the switching frequency is decreased to reduce system switching losses. Finally, the choice of which style inductor to utilize mainly depends on the price vs. size requirements and any EMI constraints. Suggesting the inductance range is from 10µH to 33µH. Input Capacitor Use low ESR capacitors for the best performance. When using ceramic capacitors make sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input terminal. Furthermore, an input capacitor improves EMI problems in the power supply circuit. Output Capacitor Over Temperature Protection When the junction temperature exceeds 150oC, the over temperature protection circuit turns off the internal switch, the converter will not turn back on until the device has cooled approximately 20 degrees. For normal operation, the junction temperature cannot exceed TJ=+125oC. The output capacitor is required to place enough capacitance to improve the system efficiency and output ripple. Ceramic capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple low. Furthermore, the output capacitance can be estimated by: COUT ≥ L 2 Where L is the inductance. The characteristics of the output capacitor also affect the stability transient behavior of the regulation system. The AME5177 can be optimized for a wide range of capacitance and ESR values, such as solid tantalum, ceramic, and aluminum electrolytic capacitors. Rev. A.01 7 AME Synchronous Boost Converter With Low Quiescent Current AME5177 Component Reference Manufacturer Part Number Value C1 Murata GRM188R60JA106ME47 10µF, 6.3V, X5R C2 Murata GRM188R60JA106ME47 10µF, 6.3V, X5R L1 Murata LQH43PN100M26 10µH Table 1. List of Components VIN L1 10µH C1 10µF VOUT LX OUT EN GND C2 10µF Typical Application Circuit Layout Considerations PCB Layout is important to achieve stable operation for switching power system at the high switching frequencies and high peak currents conditions. For best results, follow these guidelines: (1) The input capacitor placed as close and wide as possible to VIN and GND pins of the IC is recommended. (2) The output capacitor placed as close and wide as possible to VOUT and GND pins of the IC is recommended. (3) Place Lx Pin as short and wide to the IC as possible. 8 Rev. A.01 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Characterization Curve Efficiency vs. Output Current 90.0 6.5 VIN=1.5V , VOUT =2.7V , L=10µH Quiescent Current (uA) 100.0 Quiescent Current vs. Temperature Efficiency (%) 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 0.00010 0.00100 0. 01000 5.5 5 4.5 4 3.5 3 0. 10000 VOUT=2.1V 6 -50 -25 0 25 50 75 100 Output Current (A) Temperature (oC) Output Voltage vs. Temperature CCM Output Voltage Ripple 125 Output Voltage (V) 2.80 2.75 VOUT =2.7V VOUT (20mV/Div) 2.70 C2 2.65 2.60 2.55 -50 IL (50mA/Div) -25 0 25 50 75 100 C4 125 2.0µs/Div Temperature ( C) o DCM Output Voltage Ripple VOUT (20mV/Div) IL (50mA/Div) C2 VOUT (1V/Div) C2 VIN (1V/Div) C3 IL (100mA/Div) C4 C4 2.0µs/Div Rev. A.01 Power ON from Input Voltage 2.0ms/Div 9 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Tape and Reel Dimension SOT-25 P W AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size 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 SOT-26 P W AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size 10 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size SOT-26 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm Rev. A.01 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Tape and Reel Dimension (Contd.) DFN-6D (2mmx2mmx0.75mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size DFN-6D (2x2x0.75mm) 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm Rev. A.01 11 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Package Dimension SOT-25 SYMBOLS MILLIMETERS INCHES MIN MAX MIN MAX A 0.90 1.30 0.0354 0.0512 A1 0.00 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 e H 1.90 BSC 2.60 L θ1 S1 0.0748 BSC 3.00 0.37 BSC 0 o 10 0.95 BSC 0.1024 0.1181 0.0146 BSC o 0o 10o 0.0374 BSC n Lead Pattern Drawing 0.70 BSC 1.00 BSC Note: 1. Lead pattern unit description: 2.40 BSC BSC: Basic. Represents theoretical exact dimension or 0.95 BSC dimension target. 2. Dimensions in Millimeters. 3. General tolerance +0.05mm unless otherwise specified. 0.95 BSC 1.90 BSC 12 Rev. A.01 AME Synchronous Boost Converter With Low Quiescent Current AME5177 n Package Dimension (Contd.) SOT-26 Top View Side View E H D e L PIN 1 S1 A1 A Front View b DFN-6D (2mmx2mmx0.75mm) D e b E L E1 PIN 1 IDENTIFICATION D1 SYMBOLS TOP VIEW A G1 REAR VIEW Rev. A.01 BOTTOM VIEW G MILLIMETERS INCHES MIN MAX MIN MAX A 0.700 0.800 0.028 0.031 D 1.900 2.100 0.075 0.083 E 1.900 2.100 0.075 0.083 e 0.650 TYP 0.026 TYP D1 1.100 1.650 0.043 0.065 E1 0.600 1.050 0.024 0.041 b 0.180 0.350 0.007 0.014 L 0.200 0.450 0.008 0.018 G 0.178 0.228 0.007 0.009 G1 0.000 0.050 0.000 0.002 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 2013 Document: A015A-DS5177-A.01 Corporate Headquarter AME, Inc. 8F, 12, WenHu St., Nei-Hu Taipei 114, Taiwan . Tel: 886 2 2627-8687 Fax: 886 2 2659-2989