AP1511 PWM Control 5A 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-16L Pb-Free Package. AP1511 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1511 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 -Microprocessor core supply -Networking power supply -LCD MNT, TV power supply -Telecom 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-16L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. Pin Descriptions Pin Assignments Pin Name GND GND FB Pin Description No. 1 GND pin 2 GND pin 3 Feedback pin H: Normal operation EN 4 L: Step-down operation stopped Add an external resistor to set max OCSET 5 output current. Vcc 6 Signal Vcc Output 7 Switch output pin Output 8 Switch output pin Output 9 Switch output pin Output 10 Switch output pin PVcc 11 Power Vcc VC 12 Voltage clamp pin Vref 13 Reference voltage (Comp) 14 Option for comp GND 15 GND pin GND 16 GND pin (Top View) GND GND 1 16 GND 2 15 GND FB EN 3 14 (Comp) 13 OCSET 5 12 Vref VC Vcc 6 11 PVcc Output Output 7 10 Output 8 9 Output 4 AP1511 SOP-16L 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 Mar 4, 2005 1/5 AP1511 PWM Control 5A Step-Down Converter Ordering Information AP 1511 X X Packing Package S: SOP-16L Blank : Tube A : Taping Block Diagram Output Vcc Oscillation Circuit Reference Voltage Source with Soft Start Vref Vccp + PWM - Switched Control Circuit Driver Thermal Shutdown - FB CT 100uA VON/OFF VC EN OCSET (Comp) Vss Absolute Maximum Ratings Symbol Rating Unit VCC*1 VCC Pin Voltage Parameter VSS - 0.3 to VSS + 25 V VFB VOUT Pin Voltage VSS - 0.3 to VCC V VON/OFF*1 ON/OFF Pin Voltage VSS - 0.3 to VCC + 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 -20 to +125 o 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 Mar 4, 2005 2/5 AP1511 PWM Control 5A Step-Down Converter Electrical Characteristics (VIN = 12V, Ta=25°C, unless otherwise specified) Symbol VIN VFB IFB ISW ISSS Parameter Input Voltage Feedback Voltage Feedback Bias Current Switch Current Current Consumption During Power Off ∆VOUT Line Regulation /VOUT ∆VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH Power-Off Pin Input Voltage VSL Power-Off Pin Input Leakage ISH Current ISL IOCSET OCSET Pin Bias Current TSS Soft-Start Time RDSON Internal MOSFET Rdson EFFI Efficiency Conditions Min. 3.6 0.784 5.5 Typ. 0.8 0.1 - Max. 23 0.816 0.5 - Unit V V µA A VON/OFF =0V - 10 - µA VIN = 3.6V~23V - 1 2 % IOUT = 0 to 5A - 0.5 1 % 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 = 5A 2.0 75 0.3 - 20 -10 90 2 70 50 0.8 105 5 100 70 - 90 - --IOUT=0.1A -- V µA µA µA ms mΩ % Typical Application Circuit VIN Vcc CC Optional ROCSET COCSET CIN RA FB OCSET AP1511 VC CVcc VOUT OUTPUT PVcc D1 RB + - REN 20K COUT (Comp) EN VSS CEN 0.1µ Vref 0.1µ Cref Note: VOUT = VREF x (1+RA/RB) RB=1K~10K ohm Anachip Corp. www.anachip.com.tw Rev. 1.1 Mar 4, 2005 3/5 AP1511 PWM Control 5A Step-Down Converter Test Circuit PVcc OUTPUT VCC FB Oscillation open open OCSET A EN + - - VSS PVcc OUTPUT VCC + A PVcc OUTPUT VCC OCSET EN FB VSS FB OCSET EN V + VSS - Function Description PWM Control The AP1511 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1511, the pulse width varies in a range from 0 to 100%, according to the load current. The 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. Marking Information ( Top View ) 9 16 Logo AP1511 YY WW X Part No. 1 8 ID code: internal Xth week: 01~52 Year: "01" = 2001 "02" = 2002 ~ SOP-16L Anachip Corp. www.anachip.com.tw Rev. 1.1 Mar 4, 2005 4/5 AP1511 PWM Control 5A Step-Down Converter Package Information E H Package Type: SOP-16L θ L VIEW "A" D 7o(4X) y Symbol A A1 A2 B C D E e H L 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 9.80 9.90 10.00 3.80 3.90 4.00 1.27 5.80 6.00 6.20 0.38 0.71 1.27 0 8 Anachip Corp. www.anachip.com.tw C B A1 e 7o(4X) A A2 0.015x45o VIEW "A" Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.010 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.0098 0.386 0.390 0.394 0.150 0.154 0.157 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0 8 Rev. 1.1 Mar 4, 2005 5/5