AP1510 PWM Control 3A Step-Down Converter Features General Description - Input voltage: 3.6V to 23V. - Output voltage: 0.8V to VCC. - Duty ratio: 0% to 100% PWM control - Oscillation frequency: 300KHz typ. - Soft-start, Current limit, Enable function - Thermal Shutdown function - Built-in internal SW P-channel MOS - SOP-8L Pb-Free Package. AP1510 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1510 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to very the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300KHz to 30KHz. Also, an internal compensation block is built in to minimum external component count. Applications - PC Motherboard - LCD Monitor - Graphic Card - DVD-Video Player - Telecom Equipment - ADSL Modem - Printer and other Peripheral Equipment - Microprocessor core supply - Networking power supply With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP–8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage of up to 23V, it is also ideal when operating via an AC adapter. Pin Descriptions Pin Assignments Name FB 8 Vss 7 Vss OCSET 3 6 Output VCC 4 5 FB 1 EN 2 EN AP1510 OCSET VCC Output Output VSS Pin Description 1 Feedback pin. Power-off pin H: Normal operation (Step-down operation) 2 L: Step-down operation stopped (All circuits deactivated) Add an external resistor to set 3 max output current. 4 IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize 5、6 trace area at this pin to reduce EMI. 7、8 GND Pin 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. 1.1 Jan 25, 2005 1/7 AP1510 PWM Control 3A Step-Down Converter Ordering Information AP 1510 X X Packing Package S: SOP-8L Blank : Tube A : Taping Block Diagram Output Oscillation Circuit Reference Voltage Source with Soft Start Vcc + PWM-Switched Control Circuit FB - Thermal Shutdown VON/OFF EN 100uA Vss OCSET Absolute Maximum Ratings Symbol *1 VCC VFB Parameter VCC Pin Voltage Feedback Pin Voltage Rating Unit VSS - 0.3 to VSS + 25 V VSS - 0.3 to VCC V VON/OFF*1 ON/OFF Pin Voltage VSS - 0.3 to VIN + 0.3 V VOUTPUT Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V PD Power Dissipation Internally limited mW TOPR Operating Temperature Range o -20 to +125 C o TSTG Storage Temperature Range -40 to +150 C Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Anachip Corp. www.anachip.com.tw Rev. 1.1 2/7 Jan 25, 2005 AP1510 PWM Control 3A Step-Down Converter Electrical Characteristics (VIN = 12V, Ta=25°C, unless otherwise specified) Symbol Parameter VFB Feedback Voltage VIN Input Voltage ISW Switch Current Current Consumption ISSS During Power Off ∆VOUT Line Regulation /VOUT ∆VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH EN Pin Input Voltage VSL ISH EN Pin Input Leakage Current ISL IOCSET OCSET Pin Bias Current TSS Soft-Start Time RDSON Internal MOSFET Rdson EFFI Efficiency Conditions Min. 0.784 3.6 3.5 Typ. 0.8 - Max. 0.816 23 - Unit V V A VON/OFF =0V - 10 - µA VIN = 5V~23V, IOUT=0.2A - 1 2 % IOUT = 0.1 to 3A - 0.2 0.5 % Measure waveform at SW pin 240 300 360 KHz Measure waveform at SW pin 10 30 60 KHz Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin ----VIN=5V, VFB=0V VIN=12V, VFB=0V VIN = 12V, VOUT = 5V IOUT = 3A 2.0 75 0.3 - 20 -10 90 2 110 70 0.8 105 5 150 100 - 91 - IOUT=0.1A --- V µA µA µA ms mΩ % Typical Application Circuit VIN Vcc VOUT Output ROCSET COCSET Option CC Optional RA FB OCSET CIN CVcc RB AP1510 + - D1 COUT REN 100K EN VSS CEN 0.1µ Note: VOUT = VFB x (1+RA/RB) RB=0.7K~5K ohm Anachip Corp. www.anachip.com.tw Rev. 1.1 3/7 Jan 25, 2005 AP1510 PWM Control 3A Step-Down Converter AP1510 Vin v.s. Frequency (Vout=3.3V; Iout=0.2A) 350 345 340 335 330 325 320 315 310 305 300 FB (V) Fosc (KHz) Typical Performance Characteristics 0 5 10 15 20 Vin (V) 0 3.35 Vout (A) Vout(V) 3.30 3.25 3.20 3.15 3.10 0 5 10 Vin(V) 15 20 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.74 25 AP1510 Line Regulation (Vout=3.3V; Iout=0.2A) 3.40 25 AP1510 Vin v.s. FB (Vout=3.3V; Iout=0.2A) 5 10 15 20 Vin (V) 25 AP1510 Load Regulation (Vin=12V) 5.10 5.09 5.08 5.07 5.06 5.05 5.04 5.03 5.02 5.01 5.00 0.0 1.0 2.0 3.0 4.0 Iout (A) AP1510 Efficiency Efficiency (%) 100 90 80 70 60 50 40 30 20 Vout:5.0V Vout:3.3V 10 0 0.0 1.0 Iout (A) 2.0 3.0 Anachip Corp. www.anachip.com.tw Rev. 1.1 4/7 Jan 25, 2005 AP1510 PWM Control 3A Step-Down Converter Typical Performance Characteristics (Continued) AP1510 Vout Ripple (Vin=12V; Vout=3.3V; Iout=0.1A) AP1510 Vout Ripple (Vin=12V; Vout=3.3V; Iout=3A) Test Circuit VCC OUTPUT FB Oscillation open open OCSET A EN VCC + - A + - VSS OUTPUT VCC OUTPUT OCSET EN FB VSS FB OCSET EN VSS V + - Anachip Corp. www.anachip.com.tw Rev. 1.1 5/7 Jan 25, 2005 AP1510 PWM Control 3A Step-Down Converter Function Description RDS(ON) Current Limiting The current limit threshold is setting by connecting an external resistor from VCC supply to OCSET. The voltage drop across this resistor is due to the 100uA internal sink sets the voltage at the pin. When the PWM voltage is less than the voltage at OCSET, an over-current condition occurs. PWM Control The AP1510 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1510, the pulse width varies in a range from 0 to 100, according to the load current, and yet ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Under Voltage Lockout The under voltage lockout circuit of the AP1510 assures that the high-side MOSFET driver outputs remain in the off state whenever the supply voltage drops below set parameters. Lockout occurs if VCC falls below 3.3V. Normal operation resumes once VCC rises above 3.5V. Marking Information ( Top View ) 8 5 Logo AP1510 Part no. YY WW X 4 Anachip Corp. www.anachip.com.tw ~ 1 ID code: internal Xth week: 01~52 Year: "01" =2001 "02" =2002 Rev. 1.1 6/7 Jan 25, 2005 AP1510 PWM Control 3A Step-Down Converter Package Information H E Package Type: SOP-8L L VIEW "A" D 0.015x45 7 (4X) e B A1 C A A2 7 (4X) VIEW "A" y Symbol A A1 A2 B C D E e H L y θ Dimensions In Millimeters Min. Nom. Max. 1.40 1.60 1.75 0.10 0.25 1.30 1.45 1.50 0.33 0.41 0.51 0.19 0.20 0.25 4.80 5.05 5.30 3.70 3.90 4.10 1.27 5.79 5.99 6.20 0.38 0.71 1.27 0.10 0O 8O Anachip Corp. www.anachip.com.tw Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.100 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.010 0.189 0.199 0.209 0.146 0.154 0.161 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0.004 0O 8O Rev. 1.1 7/7 Jan 25, 2005