PAM2400

3-Pin Synchronous Step-Up DC/DC Converter F eatures n Schottky Diode Embedded, Saving Cost and Space n Low Start-up Voltage (0.9V) n High Efficiency up to 88% n Low Quiescent Current n Low Ripple and Noise n Available Output Voltage: 2.0V,2.7V,2.8V, 3.0V, 3.3V,3.8V and 5.0V n Space Saving Packages: SOT-89, SOT-23 n Pb-Free Package PAM2400 General Description The PAM2400 is a high efficiency step-up DC/DC converter, delivering a fixed output voltage of 2.0V, 2.7V, 2.8V, 3.0V, 3.3V, 3.8V or 5.0V. The device starts up with an input voltage as low as 0.9V at 1mA load. The Pulse Frequency Modulation (PFM) scheme provides optimized performance for applications with light load and low input voltages. The PAM2400 employs a built-in synchronous rectifier, instead of requiring an external Schottky diode, so that to improve system efficiency and save system cost and PCB area. The internal PFM control circuit operates at constant switching frequency of 100KHz. Only three external components are required. The space saving SOT-89 and SOT-23 packages make t h e PA M 2 4 0 0 i d e a l f o r s p a c e c o n s c i o u s applications. Applications n n n n n n Pagers Cameras Wireless Microphones Pocket Organizers Battery Backup Suppliers Portable Instruments Typical Application V IN L1 100 μ H VO Block Diagram SW PAM2400 VOUT VOUT 1M SW GND + C IN 22 μ F + + CO 47 μ F 1.25V REF Enable GND OSC 100KHz Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 1 3-Pin Synchronous Step-Up DC/DC Converter P in Configuration & Marking Information SOT89-3 V: Voltage Code X: Internal Code Y: Year W: Week PAM2400 P2400V XXXYW 1 2 SOT23-3 3 3 CC: Product Code of PAM2400 V: Voltage Code Y: Year W: Week CCVYW 1 Pin Number 1 2 3 2 Name GND VOUT SW Ground Output Switch Pin Function Absolute Maximum Ratings These are stress ratings only and functional operation is not implied . Exposure to absolute maximum ratings for prolonged time periods may affect device reliability . All voltages are with respect to ground . Supply Voltage............................................ 6.0V SW pin Voltage............................................. 6.0V SW pin Switch Current..................................0.4A Operating Temperature Range.........-40 ° C to 85 ° C Storage Temperature Range...........-65 ° C to 150 ° C Lead Temperature (Soldering 5 Sec.)...........300 ° C Thermal Information Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Symbol θJC θJA PD Package SOT89-3 SOT-23 SOT89-3 SOT-23 SOT89-3 SOT-23 Maximum 45 130 160 250 550 400 Unit °C/W °C/W mW Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 2 3-Pin Synchronous Step-Up DC/DC Converter E lectrical Characteristic C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Parameter Output Voltage Accuracy Input Voltage Start-Up Voltage Hold-on Voltage Supply Current (Vo pin) VIN VSTA RT VHOLD IDD1 IDD2 IO=1mA IO=0mA,V IN =2V to 0V VO =VO X 1.05 VO =VO X 0.95 Vo=2.0V Vo=2.7V No-Load Input Current IIN IO=0mA， VIN =1.5V Vo=2.8V Vo=3.0V Vo=3.3V Vo=3.8V Vo=5.0V SW Leakage Current SW Switch-On Resistance Oscillator Duty Cycle Oscillator Frequency Efficiency (Note 2) R ON DC fOS C η VSW =5V,V IN =V O+0.5V Isw=50mA VIN =VO * 90% Current Limit Appears PAM2400 Symbol Test Conditions VIN =1.5V, IO=1mA MIN -3 TYP MAX +3 5.5 UNIX % V V V μA μA 0.9 0.4 8.5 33 19 23 25 26 29 34 45 1.0 0.6 12 μA 1.0 1.0 70 70 80 100 85 90 130 μA Ω % kHz % Peak value Note 1: V O means the nominal output voltage Note 2: Refer to “Efficiency vs Output Current” curve Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 3 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=2.0V 1.Output voltage vs Output current 4. Output Voltage vs Temperature PAM2400 2.4 2.2 2.1 Output voltage(V) Output voltage(V) Vin=0.9V Vin=1.2V Vin=1.5V 2.06 2.02 1.98 1.94 1.9 2 1.8 1.6 1.4 0 30 60 90 120 150 Output current(mA) 0 30 60 90 120 150 Temperature(℃) 90 80 70 2.Efficiency vs Output Current 14 12 10 5. I DD1 vs Temperature Efficiency(%) IDD1(uA) Vin=0.9V Vin=1.2V Vin=1.5V 60 50 40 30 20 10 0 0 20 40 60 80 100 120 Output current(mA) 8 6 4 2 0 0 30 60 90 120 150 Temperature( ℃) 1.2 1 3.Start up Voltage and Hold on voltage vs Output Current Input voltage(V) 0.8 0.6 0.4 0.2 0 0 5 10 15 Output current(mA) 20 25 Start up Hold on Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 4 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics (continued) C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=2.7V 3 2.5 PAM2400 1.Output voltage vs Output current 2.8 4. Output Voltage vs Temperature Output voltage(V) 2 Output voltage(V) 2.76 2.72 2.68 2.64 2.6 1.5 1 Vin=0.9V Vin=1.2V Vin=1.5V 0.5 0 0 30 60 Output current(mA) 90 120 0 30 60 90 120 150 Temperature(℃) 90% 80% 70% 2.Efficiency vs Output Current 16 14 12 5. I DD1 vs Temperature IDD1(uA) Vin=0.9V Vin=1.2V Vin=1.5V Efficiency 60% 50% 40% 30% 20% 10% 0% 0 20 40 60 80 100 120 Output current(mA) 10 8 6 4 2 0 0 30 60 90 120 150 Temperature(℃) 1.2 1 0.8 3.Start up Voltage and Hold on voltage vs Output Current Vin(V) 0.6 0.4 0.2 0 0 5 10 15 Output current(mA) 20 25 Start up Hold on Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 5 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics (continued) C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=2.8V 3 2.5 PAM2400 1.Output voltage vs Output current 2.9 4. Output Voltage vs Temperature Output voltage(V) 2 1.5 1 0.5 0 0 30 60 Output current(mA) 90 120 Vin=0.9V Vin=1.2V Vin=1.5V Output voltage(V) 2.86 2.82 2.78 2.74 2.7 0 30 60 90 120 150 Temperature(℃） 2.Efficiency vs Output Current 90% 80% 70% 16 14 12 5. I DD1 vs Temperature Efficiency 50% 40% 30% 20% 10% 0% 0 30 60 Output current(mA) 90 120 Vin=0.9V Vin=1.2V Vin=1.5V IDD1(uA) 60% 10 8 6 4 2 0 0 30 60 90 120 150 Temperature( ℃) 1.4 1.2 3.Start up Voltage and Hold on voltage vs Output Current Input voltage(V) 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 Output current(mA) Start up Hold on 25 Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 6 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics (continued) C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=3.0V 3.2 3 PAM2400 1.Output voltage vs Output current 3.1 4. Output Voltage vs Temperature 2.8 2.6 2.4 2.2 2 0 30 60 Output current(mA) 90 120 Vin=0.9V Vin=1.2V Vin=1.5V Output Voltage(V) 3.06 3.02 2.98 2.94 2.9 0 30 60 90 120 150 Temperature(℃) Output voltage(V) 100 90 80 70 60 50 40 30 20 10 0 0 2.Efficiency vs Output Current 16 14 12 5. I DD1 vs Temperature Efficiency(%) IDD1(uA) Vin=0.9V Vin=1.2V Vin=1.5V 10 8 6 4 2 0 30 60 Output current(mA) 90 120 0 30 60 90 120 150 Temperature( ℃) 3.Start up Voltage and Hold on voltage vs Output Current 1.2 1 Input voltage(V) 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 Output current(mA) Start up Hold on Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 7 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics (continued) C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=3.3V 4 3.5 PAM2400 1.Output voltage vs Output current 3.4 3.36 4. Output Voltage vs Temperature Output voltage(V) 2.5 2 1.5 1 0.5 0 0 30 60 90 120 Output current(mA) 150 Vin=0.9V Vin=1.2V Vin=1.5V Vin=1.8V Vin=2.0V Output Voltage(V) 3 3.32 3.28 3.24 3.2 0 30 60 90 120 150 Temperature( ℃) 2.Efficiency vs Output Current 90% 85% 80% 16 14 12 5. I DD1 vs Temperature IDD1(uA) 150 Efficiency 75% 70% 65% 60% 55% 50% 0 30 60 90 120 Output current(mA) Vin=0.9V Vin=1.2V Vin=1.5V Vin=1.8V Vin=2V 10 8 6 4 2 0 0 30 60 90 120 150 Temperature(℃) 1.4 1.2 3.Start up Voltage and Hold on voltage vs Output Current Input voltage(V) 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 Output current(mA) Start up Hold on Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 8 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics (continued) C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=3.8V 4 3.5 PAM2400 1.Output voltage vs Output current 3.9 3.86 4. Output Voltage vs Temperature Output voltage(V) 2.5 2 1.5 1 0.5 0 0 30 60 90 Output current(mA) Vin=0.9V Vin=1.2V Vin=1.5V Vin=1.8V Vin=2V Output voltage(V) 3 3.82 3.78 3.74 3.7 120 0 30 60 90 120 150 Temperature( ℃) 2.Efficiency vs Output Current 90% 80% 18 16 14 12 10 8 6 4 2 0 5. I DD1 vs Temperature 60% Vin=0.9V 50% 40% 30% Vin=1.2V Vin=1.5V Vin=1.8 Vin=2V IDD1(uA) Efficiency 70% 0 30 60 Output current(mA) 90 120 0 30 60 90 120 150 Temperature(℃) 1.4 1.2 3.Start up Voltage and Hold on voltage vs Output Current Input voltage(V) 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 Output current(mA) Start up Hold on Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 9 3-Pin Synchronous Step-Up DC/DC Converter Typical Performance Characteristics (continued) C IN=22 μ F,C O=47 μ F,T A=25°C, unless otherwise noted. Vo=5.0V 6 5 PAM2400 1.Output voltage vs Output current 5.1 4. Output Voltage vs Temperature Output voltage(V) 4 3 2 1 0 0 30 60 Output current(mA) 90 Vin=0.9V Vin=1.2V Vin=1.5V Vin=1.8V Vin=2V Output Voltage(V) 5.06 5.02 4.98 4.94 4.9 120 0 30 60 90 120 150 Temperature(℃) 2.Efficiency vs Output Current 95% 90% 85% 20 25 5. I DD1 vs Temperature Efficiency IDD1(uA) Vin=0.9V Vin=1.2V Vin=1.5V Vin=1.8V Vin=2V 80% 75% 70% 65% 60% 55% 50% 0 15 10 5 0 20 40 60 80 100 120 0 30 60 90 120 150 Output current(mA) Temperature( ℃) 1.4 1.2 3.Start up Voltage and Hold on voltage vs Output Current Input voltage(V) 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 Output current(mA) Start up Hold on Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 10 3-Pin Synchronous Step-Up DC/DC Converter Application Information Inductor Selection To select an inductor for PAM2400 applications, it should be noted that the inductors current saturation rating should be larger than the possible peak inductor current to ensure proper operation, and it should have low DCR (DC resistance). Using an inductor with the saturation current lower than the possible peak indicator current can cause a dramatic drop in the inductance and severely decay the maximum output current levels. An inductor is chosen based on desired ripple current. Larger inductors result in lower ripple currents, and smaller ones higher ripple. A 100uH inductor will b e a s u i t a b l e c h o i c e f o r m o s t PA M 2 4 0 0 applications. The following equation can also help to get a good approximate value for the inductor. L=V IN*D /(△I L* f ) D ( Duty Cycle) = 1 - V IN/ V OUT ΔI L (Ripple Current) in the Inductor, i.e., 20% to 40% of the maximum inductor current(Ip). F (Switching Frequency)=100K. Output and Input Capacitor Selection Input Capacitor An input capacitor of minimum 22μF is recommended to reduce input ripple and switching noise for normal operating conditions. A larger capacitor with lower ESR (Equivalent Series Resistance) may be needed if the application requires very low input ripple. Usually ceramic capacitors are a good choice for applications. Note that the input capacitor should be located as close as possible to the IC. Output Capacitor A minimum 47μF output capacitor is recommended and may-be a larger one is better. The total output voltage ripple has two components, the capacitive ripple caused by the charging and discharging on the output capacitor, and the ohmic ripple due to the capacitor's equivalent series resistance (ESR): V RIPPLE=V RIPPLE(C)+V RIPPLE(ESR) V RIPPLE(C) ≈1 / 2 *( L /( C ( OUT) *(( V OUT( MAX) - V IN( MIN) ) ) ) ) *( I 2PEAK- I 2OUT) And V RIPPLE( ESR) = I PEAK* R ESR( COUT) Where Ipeak is the peak inductor current . Multilayer ceramic capacitors are a good choice as they have extremely low ESR and are available in small footprints. Capacitance and ESR variation vs temperature should be considered for best performance in applications with wide operating temperature ranges. Component Power Dissipation Operating in discontinuous mode, power loss in the winding resistance of the inductor is approximately equal to PDL=2/3(T ON/L)*R D*((V OUT+V F)/V OUT)*P OUT The power dissipated in a switch loss is PDsw=2/3(T ON/L)*R ON*((V OUT+V D-V IN)/V OUT)*(P OUT) The power disspated in rectifier diode(Internal Diode) is PDd=V D*I OUT Where POUT=VOUT*IOUT, RD=Inductor DCR, V D=Diode drop PC Board Layout considerations Careful PC board layout is important for minimizing ground bounce and noise. Keep the IC's GND pin and the ground leads of input and output capacitors as close as possible. In addition, connect L1 and SW with short and wide connections. PAM2400 Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 11 3-Pin Synchronous Step-Up DC/DC Converter O rdering Information PAM2400 X X X XXX Output Voltage Number of Pins Package Type Pin Configuration Pin Configuration A Type 1. GND 2. VOUT 3. SW Package Type A: SOT-23-3 C: SOT-89-3 Number of Pins A: 3 Output Voltage 200: 2.0V 270: 2.7V 280: 2.8V 300: 3.0V 330: 3.3V 380: 3.8V 500: 5.0V PAM2400 Part Number PAM2400AAA200 PAM2400ACA200 PAM2400AAA270 PAM2400ACA270 PAM2400AAA280 PAM2400ACA280 PAM2400AAA300 PAM2400ACA300 PAM2400AAA330 PAM2400ACA330 PAM2400AAA380 PAM2400ACA380 PAM2400AAA500 PAM2400ACA500 Output Voltage 2.0V 2.0V 2.7V 2.7V 2.8V 2.8V 3.0V 3.0V 3.3V 3.3V 3.8V 3.8V 5.0V 5.0V Marking CCGYW P2400G XXXYW CCHYW P2400H XXXYW CCRYW P2400R XXXYW CCCYW P2400C XXXYW CCDYW P2400D XXXYW CCEYW P2400E XXXYW CCFYW P2400F XXXYW Package Type SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 SOT-23-3 SOT-89-3 MOQ 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel 3,000Unites/Tape&Reel 1,000Unites/Tape&Reel Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 12 3-Pin Synchronous Step-Up DC/DC Converter O utline Dimension SOT89-3 PAM2400 4 . 5 0 . 05 1 . 650 REF 1 . 400 REF 1 . 50 0 . 05 4 . 20 0 . 05 2 . 5 0 . 05 1 . 00 0 . 07 1 . 50 1 . 50 3 . 00 0 . 025 6’-2X 6’ 0 . 46 0 . 025 0 . 38 0 . 01 6’-2X ( Unit : mm ) Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 13 3-Pin Synchronous Step-Up DC/DC Converter O utline Dimension SOT23-3 PAM2400 D B A A1 E H Dim S e Millimeters Min. 1.00 0.00 0.35 0.10 2.70 1.40 2.40 0.37 Typ. 1.15 0.05 0.43 0.175 2.90 1.60 1.90BSC 2.70 3.00 Max. 1.30 0.10 0.51 0.25 3.10 1.80 A A1 B C D E e H L L C Power Analog Microelectronics , Inc www.poweranalog.com 12/2007 Rev 1.0 14