OCP2030 SWITCHING BUCK REGULATOR

Transcription

1 General Description The OCP2030 is a buck topology of switching regulator for wide operating voltage applications field. The OCP2030 includes a high current P-MOSFET, high precision reference (0.5V) for comparing output voltage with feedback amplifier, an internal dead-time control and oscillator for controlling the maximum duty cycle and PWM frequency, and has power-on programmable soft start time and short circuit PMOS turn-off and auto re-start protection functions. Features Precision feedback reference voltage: 0.5V (2%) Wide supply voltage operating range: 3.0 to 20V Low current consumption: 5.5mA Internal fixed oscillator frequency: Typ. 500KHz Programmable Soft-Start function (SS) Short Circuit Shutdown and Auto Re-start function(arscp) Built-in P-MOSFET for 3A loading capability Package: SOP8 Typical Application Circuit Vin 1 VCC LX 8 Vout + 2 LX OCP2030 IN- SCP FB GND GND Pin Configuration Top View OCP Name No. Status Description VCC 1 P IC Power Supply (PMOS Source) SS/SCP 2 I Connecting with a Soft-start & ARSCP timing capacitor IN- 3 I Error Amplifier Inverting Input FB 4 O Error Amplifier Compensation Output GND 5 6 P IC Ground LX 7 8 O PMOS High Current Output Page1-8 Rev. 1.0 Jan 09, 2007

2 Block Diagram 1 Reference Regulator Oscillator 1.25V Thermal Shuntdown 3 0.5V 36KΩ 500Ω Output drive control circuits 0.7V 4 Soft start&auto Re-start S.C.P Circuits Absolute Maximum Ratings Power supply voltage +20V Output source current +3A Error amplifier inverting input -0.3V~+1.2V Allowable dissipation SOP8 Ta mW Operating temperature Storage temperature SOP8 Lead Temperature (soldering, 10 sec) +260 DC Electrical Characteristics Electrical characteristics over recommended operating free-air temperature range, V CC =6V, (unless otherwise noted) Reference Output voltage V REF COMP connected to FB V Input regulation V REF Vcc=3.0V to 20V mv Output voltage change with temperature V REF /V REF T A =-10 to T A =25 to % Soft Start (S.S.) S.S. Source current I SS V SS = 0V µa Soft start threshold voltage V SST V Page2-8 Rev. 1.0 Jan 09, 2007

3 DC Electrical Characteristics (Continuous) Short-circuit protection (S.C.P.) S.C.P source current I SCP V =0V SCP µa SCP re-start/hold time T RS /T HOLD V COMP >0.8V 1/20 - S.C.P threshold voltage V SCP V FB >450mV V SB V FB <450mV V Oscillator Frequency f KHz Frequency change with voltage f/ V Vcc=3.0 V to 20V - 5 % Frequency change with temperature f/ T T A =--10 to % Error amplifier Input threshold voltage V IN- V FB =450mV mv V T change with voltage V IN- / V V CC =3V to 20V mv V T change with temperature V IN- / T Ta = -10 to % Input bias current I B µa Voltage Gain Av V/V Frequency bandwidth BW Av=0 db MHz Output voltage Positive V POS V IN- =0.3V Swing Negative V NEG V IN- =0.7V V Output source current I SOURCE µa V FB =450mV Output sink current µa I SINK Idle Period Adjustment Parameter Symbol Test Conditions Min. Typ, Max. Unit Maximum duty cycle T DUTY V IN - =0.2V % Output Parameter Symbol Test Conditions Min. Typ, Max. Unit PMOS D-S voltage V DSS V FB =0.1V V PMOS source current I D -2 A PMOS On resistance R DS(ON) V CC =5.0V, V IN- =0V V CC =10V, V IN- =0V mω Output leakage current I L SCP active 5 - µa Total device Standby supply current I STANDBY ma Page3-8 Rev. 1.0 Jan 09, 2007

4 Typical Characteristics Reference Output Voltage(V) Power Supply Voltage Reference Output Voltage Power Supply Voltage (V) Reference Output Voltage(V) Tempetature Reference Output Voltage Tempetature( C) Figure 1 Figure 2 Oscillator Frequency(KHz) Power Supply Voltage Oscillator Frequency Power Supply Voltage (V) Oscillator Frequency(KHz) Tempetature Oscillator Frequency Tempetature( C) Figure 3 Figure 4 Page4-8 Rev. 1.0 Jan 09, 2007

5 Typical Characteristics(Continues) Effciency(%) Output Current Effciency Vcc=10V,Vout=5.0V Vcc=10V,Vout=3.3V Output Current (A) 3.5 Output Voltage(V) Output Load Regulation Vcc=10V,Vout=5.0V Vcc=10V,Vout=3.3V Output Current (A) 3.5 Timing Waveform Figure 5 Figure 6 Figure 7 PWM Timing Diagram Page5-8 Rev. 1.0 Jan 09, 2007

6 Ordering Information OCP2030XXXX Package: S: SOP8 Output Voltage: Blank: ADJ Packing: Blank: Tube or Bulk A: Tape & Reel Temperature Grade: I: -10~85 Marking Information Logo 2030-VV Pin 1 sign YYWWXX Part Number 2030-AJ: ADJ Internal Code Date Code: YY: Year (07=2007) WW: Nth week (01~52) Page6-8 Rev. 1.0 Jan 09, 2007

7 Package Information E H L θ VIEW A 7 (4х) D 0.015х45 7 (4х) A e B A1 C VIEW A Y Symbol Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A A B C D E e H L Y θ Page7-8 Rev. 1.0 Jan 09, 2007

8 Packing information P W D Package Type Carrier Width (W) Pitch (P) Reel Size(D) Packing Minimum SOP8 12.0± 0.3 mm 4.0±0.1 mm 330±1 mm 2500 pcs Note: Carrier Tape Dimension, Reel Size and Packing Minimum Page8-8 Rev. 1.0 Jan 09, 2007