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1、 1 PS7516 . Description The PS7516 is a high efficiency, fixed frequency 550KHz, current mode PWM boost DC/DC converter which could operate battery such as input voltage down to 2.5V. The converter output voltage can be adjusted to a maximum of 5.25V by an external resistor divider. Besides the conv
2、erter includes a 0.08 N-channel MOSFET switch and 0.12 P-channel synchronous rectifier. So no external Schottky diode is required and could get better efficiency near 93%. The converter is based on a fixed frequency, current mode, pulse-width-modulation PWM controller that goes automatically into PS
3、M mode at light load. When converter operation into discontinuous mode, the internal anti-ringing switch will reduce interference and radiated electromagnetic energy. The PS7516 is available in a space-saving SOT-23-6 package for portable application. Features High Efficiency up to 93% Low RDS(ON) I
4、ntegrated Power MOSFET NMOS 80m / PMOS120m Wide Input Voltage Range: 2.5V to 5.5V Fixed 1MHz Switching Frequency Low-Power Mode for Light Load Conditions 2.0% Voltage Reference Accuracy PMOS Current Limit for Short Circuit Protection Low Quiescent Current Output Ripple under 200mV. (Scope Full Bandw
5、idth) Fast Transient Response Built-In Soft Start Function Over-Temperature Protection with Auto Recovery Output Overvoltage Protection Space-Saving SOT-23-6 Package Applications Portable Power Bank Wireless Equipment Handheld Instrument GPS Receiver Pin Assignments SOT- 23- 6 213 645 LX VIN GND OUT
6、 EN FB Figure 1. Pin Assignment of PS7516 Functional Pin Description Pin Name Pin No. Pin Function EN 4 Logic Controlled Shutdown Input. GND 2 Ground Pin. LX 1 Power Switching Connection. Connect LX to the inductor and output rectifier. VIN 6 Power Supply Input Pin. OUT 5 Output of the Synchronous R
7、ectifier. FB 3 Voltage Feedback Input Pin. 1 PS7516 . Description The PS7516 is a high efficiency, fixed frequency 550KHz, current mode PWM boost DC/DC converter which could operate battery such as input voltage down to 2.5V. The converter output voltage can be adjusted to a maximum of 5.25V by an e
8、xternal resistor divider. Besides the converter includes a 0.08 N-channel MOSFET switch and 0.12 P-channel synchronous rectifier. So no external Schottky diode is required and could get better efficiency near 93%. The converter is based on a fixed frequency, current mode, pulse-width-modulation PWM
9、controller that goes automatically into PSM mode at light load. When converter operation into discontinuous mode, the internal anti-ringing switch will reduce interference and radiated electromagnetic energy. The PS7516 is available in a space-saving SOT-23-6 package for portable application. Featur
10、es High Efficiency up to 93% Low RDS(ON) Integrated Power MOSFET NMOS 80m / PMOS120m Wide Input Voltage Range: 2.5V to 5.5V Low-Power Mode for Light Load Conditions 2.0% Voltage Reference Accuracy PMOS Current Limit for Short Circuit Protection Low Quiescent Current Output Ripple under 200mV. (Scope
11、 Full Bandwidth) Fast Transient Response Built-In Soft Start Function Over-Temperature Protection with Auto Recovery Output Overvoltage Protection Space-Saving SOT-23-6 Package Applications Portable Power Bank Wireless Equipment Handheld Instrument GPS Receiver Pin Assignments SOT- 23- 6 213 645 LX
12、VIN GND OUT EN FB Figure 1. Pin Assignment of PS7516 Functional Pin Description Pin Name Pin No. Pin Function EN 4 Logic Controlled Shutdown Input. GND 2 Ground Pin. LX 1 Power Switching Connection. Connect LX to the inductor and output rectifier. VIN 6 Power Supply Input Pin. OUT 5 Output of the Sy
13、nchronous Rectifier. FB 3 Voltage Feedback Input Pin. Fixed 1MHz Switching Frequency 2 . PS7516 Block Diagram On/Off Control OUT FB PWM Control Logic Isense/Current Limit Slope Comp. COMP Body-Diode Switch Bandgap Reference Error Amp Anti-Reverse Comparator NMOS GND ANTI-RING PMOS EN LXVIN PFM Contr
14、ol UVLO VIN OSC OVP OTP Figure 3. Block Diagram of PS7516 2 . PS7516 Block Diagram On/Off Control OUT FB PWM Control Logic Isense/Current Limit Slope Comp. COMP Body-Diode Switch Bandgap Reference Error Amp Anti-Reverse Comparator NMOS GND ANTI-RING PMOS EN LXVIN PFM Control UVLO VIN OSC OVP OTP Figure 3. Block Diagram of PS7516 3 PS7516 Absolute Maximum Ratings (Note 1) Supply Voltage VIN - -0.3V to +6.5V LX Voltage VLX - -0.3V to +6.5V All Other Pins Voltage - -0.3V to +6.5V Maximum Junction Temperature (TJ) - +150C Storage Temperature (TS) -
