AP2004 DIODES | Alldatasheet

Document overview

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Technical content

AP2004 Rev. 2 1 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated

  • 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
  • Lead Free Finish/ RoHS Compliant for Lead Free and “Green” products (Note 1)
  • SOP-8L: Available in “Green” Molding Compound (No Br, Sb) 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.
  • Backlight inverter
  • LCD Monitor
  • CDROM, XDSL Product
  • DC/DC converters in computers, etc. 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 Features General Description

Applications

Ordering Information

Tube 13” Tape and Reel Device (Note 2) Package Code Packaging Quantity Part Number Suffix Quantity Part Number Suffix AP2004S S SOP-8L 100 - U 2500/Tape & Reel -13 AP 2004 X X X Package Packing S: SOP-8L -U : Tube -13 : Taping Lead-Free G : Green L : Lead Free

AP2004 Rev. 2 2 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated OUT GND SCP SS FB VCC CT COMP ( Top View ) SOP-8L Pin Descriptions Block Diagram Bandgap Reference OUT PWM Amplifier FB VCC SCP CT Error Amplifier COMP UVLO GND 0.7V 1.5V + 2.5V Internal use1.25V Iss VCC Oscillator MAX .300KHz SS Pin Assignments Name Description CT Timing Capacitor FB Voltage Feedback SS Soft-Start. COMP Feedback Loop Compensation OUT PWM Output GND Ground VCC Supply Voltage SCP Short Circuit Protection

AP2004 Rev. 2 3 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated Absolute Maximum Ratings Symbol Parameter Rating Unit PD Power dissipation at 25°C 600 mW VCC Supply voltage 28 V VI Amplifier input voltage 20 V VO Collector output voltage VCC-1.0V V ISOURCE Source current 200 mA ISINK Sink current 200 mA TOP Operating junction temperature range -20 to +85 oC TST Storage temperature range -65 to +150 oC Recommended Operating Conditions Symbol Parameter Min. Max. Unit VCC Supply voltage 3.6 27 V VI Amplifier input voltage 1.05 1.45 V VO Collector output voltage Vcc-1.5 V IFB Current into feedback terminal 45 µA RF Feedback resistor 100 k Ω CT Timing capacitor 100 6800 pF FOSC Oscillator frequency 10 300 KHz

AP2004 Rev. 2 4 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated Electrical Characteristics (TA = 25ºC, VCC = 6V, f = 200 Khz) Reference (REF) Symbol Parameter Conditions Min. Typ. Max. Unit Comp connect to FB 1.225 1.25 1.275 V TA = -20ºC ~ 25ºC -0.1 ±1 % VREF Output voltage change with temperature TA = 25ºC ~ 85ºC -0.2 ±1 % Under voltage lockout (UVLO) Symbol Parameter Conditions Min. Typ. Max. Unit VUT Upper threshold voltage (V CC) 2.9 V VLWT Lower threshold voltage (V CC) 2.4 V VHT Hysteresis (V CC) IO(REF) = 0.1mA TA = 25ºC 500 mV Short-circuit protection (SCP) control Symbol Parameter Conditions Min. Typ. Max. Unit VIT Input threshold voltage T A = 25ºC 0.60 0.67 0.75 V VSTB Standby voltage No pull up 100 130 160 mV VLT Latched input voltage No pull up 50 100 mV ISCP Input (source) current V I = 0.7V, TA = 25ºC -10 -15 -20 µA VCT Comparator threshold voltage (COMP) 1.5 V Oscillator (OSC) Symbol Parameter Conditions Min. Typ. Max. Unit FOSC Frequency C T = 270 pF 200 KHz Standard deviation of frequency C T = 270 pF 10 ∆FOSC Frequency change with voltage V CC = 3.6V ~ 20V 1 % Error-amplifier Symbol Parameter Conditions Min. Typ. Max. Unit VIO Input offset voltage V O (FB) = 1.25V ±6 mV IIO Input offset current V O (FB) = 1.25V ±100 nA IIB Input bias current V O (FB) = 1.25V 160 500 nA VCM Common-mode input voltage range VCC = 3.6V ~ 20V 1.05 1.45 V AV Open-loop voltage amplification RF = 200 kΩ 70 80 dB GBW Unity-gain bandwidth 1.5 MHz CMRR Common-mode rejection ratio 60 80 dB VOH Max. output voltage V ref-0.1 V VOL Min. output voltage 1 V IOI Output (sink) current (COMP) V ID = -0.1V, VO = 1.25V 0.5 1.6 mA IOO Output (source) current (COMP) VID = 0.1V, VO = 1.25V -45 -70 µA

AP2004 Rev. 2 5 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated Electrical Characteristics (Continued) (TA = 25ºC, VCC = 6V, f = 200 Khz) Output section Symbol Parameter Conditions Min. Typ. Max. Unit ILEAK Leakage current V O = 25V 10 µA Sink current V IN = 20V 200 mA IDRV Source current V IN = 20V 200 mA VSAT Output saturation voltage I O = 10 mA 1.0 1.5 V ISC Short-circuit output current V O = 6V 120 mA PWM comparator Symbol Parameter Conditions Min. Typ. Max. Unit VT0 CT 0.6 0.7 V VT100 Input threshold voltage at f = 10 KHz (COMP) Maximum duty cycle 1.2 1.3 V Total device Symbol Parameter Conditions Min. Typ. Max. Unit ICCA Average supply current C T = 270pF 6 10 mA Soft Start Symbol Parameter Conditions Min. Typ. Max. Unit VSS Soft-start Voltage 2.3 V ISS Constant Charge Current 20 µA Typical Application Circuit 22uH Output 5V/5A 10nF Optional Vcc = 12V P mos 4FB 470uF R3 1K~30K AF9435P AF4835P OUT VCC COMP GND SCP SS CT 9K5A 50nF Optional 470uF Step-Down DC/DC converter8 C6 220nF C5 50nF C4 270pF Vout=Vref ⎟ ⎛ + 2 11 R R

AP2004 Rev. 2 6 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated Typical Characteristics REFERENCE OUTPUT VOLTAGE vs. POWER-SUPPLY VOLTAGE 1.22 1.225 1.23 1.235 1.24 1.245 1.25 1.255 1.26 4 8 12 16 20 24 28 Vcc-Power Supply Voltage (V) Vref- Reference Output Voltage (V) AVERAGE SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE 0 4 8 12 16 20 24 28 Vcc - Power-Supply Voltgae (V) Icc-Average Supply Current (mA) AVERAGE SUPPLY CURRENT vs. AMBIENT TEMPERATURE -50 -25 0 25 50 75 100 TA - Ambient Temperatrure(℃) ICC - Average Supply Current (mA) VCT vs. Frequency 0.2 0.4 0.6 0.8 1.2 1.4 1.6 0 100 200 300 Frequency (KHz) VCT (V) VCT(min) VCT(max) OSCILLATOR FREQUENCY vs. TIMING CAPACITANCE 100 150 200 250 300 350 100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600 CT-Timing Capacitor (pF) fosc - Frequency (KHz) SCP TIME-OUT PERIOD vs. SCP CAPACITANCE 45 90 135 180 225 270 315 360 405 450 495 Cscp - SCP Capacitance (nF) tscp-SCP Time-out Period (ms)

AP2004 Rev. 2 7 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated Typical Characteristics (Continued) SOFT-START TIME (Ts) vs. SOFT-START CAPACITOR (Css) 25 50 75 100 125 150 175 200 Css (nF) Ts (mS) (1) SOP-8L SOP Year: "01" =2001 "02" =2002 Xth week: 01~52 AP2004 (Top view) YY WW Part Number Logo X Blank : Lead - Free Package G : Green Internal code X Marking Information

AP2004 Rev. 2 8 of 8 DECEMBER 2006 www.diodes.com © Diodes Incorporated Package Information (All Dimensions in mm) (1) Package Type: SOP- 8L (JEDEC Small Outline Package) 1.27typ 0.3/0.5 7°~9° 4.80/5.30 3.70/4.10 5.79/6.20 0.20typ 7°~9° 3.70/4.10 0.38/1.27 0.08/0.25 Gauge Plane 0.254 Seating Plane 0.35max. 45° Detail "A" Detail "A" 1.30/1.50 1.75max. IMPORTANT NOTICE LIFE SUPPORT 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. 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.