AP2004 ANACHIP | Alldatasheet
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This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 0.4 Arpr 6, 2004 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 PDIP and SOP packages Applications - Backlight inverter - LCD Monitor - XDROM, XDSL Product - DC/DC converters in computers, etc. 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. Pin Assignment OUT GND SCP SS FB VCC CT COMP ( Top View ) PDIP/SOP Pin Descriptions 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 Ordering Information AP2004 X X X Package Packing S: SOP-8L Blank : Tube A : Taping Lead Free Blank : Normal L : Lead Free Package N: PDIP-8L
Anachip Corp. 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.500KHz SS Absolute Maximum Ratings Symbol Parameter Rating Unit 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 temperature range -20 to +85 oC TST Storage temperature range -65 to +150 oC TLEAD Lead temperature 1.6 mm(1/16 inch) from case for 10 seconds 260 oC
Anachip Corp. 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 TOP Operating free-air temperature -20 85 ºC 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 %
Anachip Corp. Electrical Characteristics (Continued) (TA=25ºC, VCC=6V, f=200 Khz) 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 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
Anachip Corp. Typical Application Circuit 33uH 470uF Output Step-Down DC/DC converter 10nF Optional Vcc = 12V P mos 5 4 OUT FB VCC COMP GND SCP SS CT C6 220nF C5 50nF C4 270pF 470uF R3 10K~100K 50nF Optional Typical Characteristics REFERENCE OUTPUT VOLTAGE v.s. 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 v.s. POWER-SUPPLY VOLTAGE 0 4 8 1 21 62 02 42 8 Vcc - Power-Supply Voltgae (V) Icc-Average Supply Current (mA) AVERAGE SUPPLY CURRENT v.s. AMBIENT TEMPERATRUE -50 -25 0 25 50 75 100 TA - Ambient Temperatrure(℃) ICC - Average Supply Current (mA) VCT v.s. 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)
Anachip Corp. Typical Characteristics (Continued) OSCILLATOR FREQUENCY v.s. 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 v.s. SCP CAPACITANCE 45 90 135 180 225 270 315 360 405 450 495 Cscp - SCP Capacitance (nF) tscp-SCP Time-out Period (ms) SOFT-START TIME (Ts) v.s. SOFT-START CAPACITOR (Css) 25 50 75 100 125 150 175 200 Css (nF) Ts (mS) Marking Information (Top View) PDIP/SOP AC AP2004 YY WW X X Logo Part No. ID code Year: "01" =2001 "02" =2002 Xth week: 01~52 Blank: normal L: Lead Free Package
Anachip Corp. Package Information (1) PDIP-8L (Plastic Dual-in-line Package ) D 7 (4X) AL A2A1 B2B1 B eS 15 (4X) E C eB E-PIN O0.118 inch PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
Anachip Corp. Package Information (Continued) (2) SOP- 8L(JEDEC Small Outline Package) VIEW "A" L C VIEW "A" H E A A2A1Be D 7 (4X) 0.015x45 7 (4X) y A1 0.10 - 0.25 0.040 - 0.100 θ 0O - 8 O 0 O - 8 O