AP2004_09

AP2004 PWM BUCK CONTROLLER Features • • • • • • • • • • PWM Buck Control Circuitry Operating voltage can be up to 27V Under voltage Lockout (UVLO) Protection Short Circuit Protection (SCP) Soft-start circuit Variable Oscillator Frequency -- 300Khz Max 1.25V voltage reference Output 8-pin SOP package SOP-8L: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) General Description The AP2004 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-supply regulator. All the functions include an on-chip 1.25V reference output, an error amplifier, an adjustable oscillator, a soft-start, UVLO, SCP circuitry, and a push-pull output circuit. Switching frequency is adjustable by trimming CT. During low VCC situation, the UVLO makes sure that the outputs are off until the internal circuit operates normally. Applications • • • • Backlight inverter LCD Monitor CDROM, XDSL Product DC/DC converters in computers, etc. Ordering Information AP 2004 S X - 13 Package S : SOP-8L Lead Free L : Lead Free G : Green Packaging (Note 2) SOP-8L SOP-8L Packing 13 : Tape & Reel Device Lead-free AP2004SL-13 AP2004SG-13 Notes: Package Code S S 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP2004 Rev. 3 1 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Pin Assignments ( Top View ) OUT VCC COMP FB 1 2 3 4 8 7 6 5 GND CT SS SCP SOP-8L Pin Descriptions Pin Name CT FB SS COMP OUT GND VCC SCP Timing Capacitor Voltage Feedback Soft-Start. Description Feedback Loop Compensation PWM Output Ground Supply Voltage Short Circuit Protection AP2004 Rev. 3 2 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Block Diagram VCC SS CT 1.25V Bandgap Reference 2.5V Internal use UVLO Oscillator VCC MAX 300KHz . Iss PWM Amplifier FB + + Error Amplifier OUT COMP 1.5V + 0.7V + SCP GND Absolute Maximum Ratings Symbol PD VCC VI VO ISOURCE ISINK TOP TST Parameter Power dissipation at 25°C Supply voltage Amplifier input voltage Collector output voltage Source current Sink current Operating junction temperature range Storage temperature range Rating 600 28 20 VCC-1.0V 200 200 -20 to +125 -65 to +150 Unit mW V V V mA mA o C o C Recommended Operating Conditions Symbol VCC VI VO IFB RF CT FOSC Supply voltage Amplifier input voltage Collector output voltage Current into feedback terminal Feedback resistor Timing capacitor Oscillator frequency 100 100 10 6800 300 Parameter Min 3.6 1.05 Max 27 1.45 Vcc-1.5 45 Unit V V V µA kΩ pF KHz AP2004 Rev. 3 3 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Electrical Characteristics (TA = 25ºC, VCC = 6V, f = 200 Khz) Reference (REF) Symbol Parameter Comp connect to FB VREF Output voltage change with temperature Under voltage lockout (UVLO) Symbol Parameter VUT Upper threshold voltage (VCC) VLWT Lower threshold voltage (VCC) VHT Hysteresis (VCC) Short-circuit protection (SCP) control Symbol Parameter VIT Input threshold voltage VSTB Standby voltage VLT Latched input voltage ISCP Input (source) current Comparator threshold voltage VCT (COMP) Oscillator (OSC) Symbol Parameter FOSC Frequency Standard deviation of frequency ΔFOSC Frequency change with voltage Error-amplifier Symbol Parameter VIO Input offset voltage IIO Input offset current IIB Input bias current VCM AV GBW CMRR VOH VOL IOI IOO Common-mode input voltage range Open-loop voltage amplification Unity-gain bandwidth Common-mode rejection ratio Max. output voltage Min. output voltage Output (sink) current (COMP) Output (source) current (COMP) Conditions TA = -20ºC ~ 25ºC TA = 25ºC ~ 85ºC Conditions IO(REF) = 0.1mA TA = 25ºC Min 1.225 Typ. 1.25 -0.1 -0.2 Typ. 2.9 2.4 500 Typ. 0.67 130 50 -15 1.5 Max 1.275 ±1 ±1 Max Unit V % % Unit V V mV Unit V mV mV µA V Min Conditions TA = 25ºC No pull up No pull up VI = 0.7V, TA = 25ºC Min 0.60 100 -10 Max 0.75 160 100 -20 Conditions CT = 270 pF CT = 270 pF VCC = 3.6V ~ 20V Conditions VO (FB) = 1.25V VO (FB) = 1.25V VO (FB) = 1.25V VCC = 3.6V ~ 20V RF = 200 kΩ Min Typ. 200 10 1 Typ. Max Unit KHz % Min 160 1.05 70 60 Vref-0.1 80 1.5 80 Max ±6 ±100 500 1.45 Unit mV nA nA V dB MHz dB V V mA µA 1 VID = -0.1V, VO = 1.25V VID = 0.1V, VO = 1.25V 0.5 -45 1.6 -70 AP2004 Rev. 3 4 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Electrical Characteristics Output section Symbol ILEAK IDRV VSAT Sink current Source current Output saturation voltage Parameter (Continued) (TA = 25ºC, VCC = 6V, f = 200 Khz) Conditions VO = 25V VIN = 20V VIN = 20V IO = 10 mA VO = 6V Conditions Min Typ. 200 200 1.0 120 Max 10 Unit µA mA mA Leakage current 1.5 V mA ISC Short-circuit output current PWM comparator Symbol Parameter VT0 VT100 Total device Symbol ICCA Soft Start Symbol VSS ISS Min 1.2 Min Typ. 0.6 1.3 Typ. 6 Max 0.7 Unit V V Input threshold voltage at f = 10 KHz CT (COMP) Maximum duty cycle Parameter Average supply current Parameter Soft-start Voltage Constant Charge Current Conditions CT = 270pF Conditions Max 10 Max Unit mA Unit V µA Min Typ. 2.3 20 Typical Application Circuit R3 1K~30K Vcc = 12V C2 10nF Optional 1 OUT GND 8 2 VCC CT 7 3 COMP SS 6 FB SCP 5 C4 270pF C5 50nF C6 220nF 4 Q1 P mos AF9435P AF4835P 5A C1 470uF L1 22uH R1 9K Output 5V/5A C4 50nF Optional C3 470uF R2 3K Vout=Vref ⎜1 + ⎛ ⎝ R1 ⎞ ⎟ R2 ⎠ Step-Down DC/DC converter AP2004 Rev. 3 5 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Typical Characteristics REFERENCE OUTPUT VOLTAGE vs. POWER-SUPPLY VOLTAGE 1.26 1.255 1.25 1.245 1.24 1.235 1.23 1.225 1.22 4 8 12 16 20 24 28 AVERAGE SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE 5 VrefReference Output Voltage (V) Icc-Average Supply Current (mA) 4 3 2 1 0 0 4 8 12 16 20 24 28 Vcc-Power Supply Voltage (V) Vcc - Power-Supply Voltgae (V) VCT(min) VCT(max) AVERAGE SUPPLY CURRENT vs. AMBIENT TEMPERATURE 7 VCT vs. Frequency 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 100 200 ICC - Average Supply Current (mA) 6 5 4 3 2 -50 -25 0 25 50 75 100 VCT (V) 300 TA - Ambient Temperatrure(℃) Frequency (KHz) 350 OSCILLATOR FREQUENCY vs. TIMING CAPACITANCE tscp-SCP Time-out Period (ms) 35 30 25 20 15 10 5 0 45 SCP TIME-OUT PERIOD vs. SCP CAPACITANCE fosc - Frequency (KHz) 300 250 200 150 100 50 0 100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600 90 135 180 225 270 315 360 405 450 495 CT-Timing Capacitor (pF) Cscp - SCP Capacitance (nF) AP2004 Rev. 3 6 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Typical Characteristics (Continued) SOFT-START TIME (Ts) vs. SOFT-START CAPACITOR (Css) 30 25 20 15 10 5 0 25 50 75 100 125 150 175 200 Ts (mS) Css (nF) Marking Information (1) SOP-8L ( Top View ) 8 5 Logo Part Number AP2004 YY WW X X 1 4 L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code AP2004 Rev. 3 7 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP2004 PWM BUCK CONTROLLER Package Information (1) Package Type: SOP- 8L (All Dimensions in mm) 3.85/3.95 5.90/6.10 0.10/0.20 0.254 0.62/0.82 Gauge Plane Seating Plane Detail "A" 7°~9° 1.30/1.50 1.75max. 0.15/0.25 0.35max. 45° 7°~9° Detail "A" 0°/8° 1.27typ 4.85/4.95 0.3/0.5 8x-0.60 5.4 6x-1.27 8x-1.55 Land Pattern Recommendation (Unit: mm) IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP2004 Rev. 3 8 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated