AP2014-AN

AP2014 ANACHIP | Alldatasheet

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Synchronous PWM Controller 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. 1.2 Nov 29, 2005 „ Features - Synchronous Controller in 8-Pin Package - Operating with single 5V or 12V supply voltage - Internal 200KHz Oscillator (400KHz for AP2014A) - Soft-Start Function - Fixed Frequency Voltage Mode - 500mA Peak Output Drive Capability - Protects the output when control FET is shorted - SOP-8L/PDIP-8L Pb-Free package „ Applications - Graphic Card - Hard Disk Drive - DDR memory source sink Vtt application - Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V „ Pin Assignments SOP-8L/PDIP-8L (Top View) Vcc GND AP2014/ALDrv HDrv Vc Comp FB SS „ General Description The AP2014 controller IC is designed to provide a low cost synchronous Buck regulator for on-board DC to DC converter applications. With the migration of today’s ASIC products requiring low supply voltages such as 1.8V and lower, together with currents in excess of 3A, traditional linear regulators are simply too lossy to be used when input supply is 5V or even in some cases with 3.3V input supply. The AP2014 together with dual N-channel MOSFETs such as AF9410, provide a low cost solution for such applications. This device features an internal 200KHz oscillator (400KHz for "A" version), under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. „ Pin Descriptions Pin Name Pin No. Description FB 1 This pin is connected directly to the output of the switching regulator via resistor divider to provide feedback to the Error amplifier. Vcc 2 This pin provides biasing for the internal blocks of the IC as well as power for the low side driver. A minimum of 1uF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. LDrv 3 Output driver for the synchronous power MOSFET. GND 4 This pin serves as the ground pin and must be connected directly to the ground plane. A high frequency capacitor (0.1 to 1uF) must be connected from V5 and V12 pins to this pin for noise free operation. HDrv 5 Output driver for the high side power MOSFET. Vc 6 This pin is connected to a voltage that must be at least 4V higher than the bus voltage of the switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A minimum of 1uF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. Comp 7 Compensation pin of the error amplifier. An external resistor and capacitor network is typically connected from this pin to ground to provide loop compensation. SS 8 This pin provides soft-start for the switching regulator. An internal current source charges an external capacitor that is connected from this pin to ground which ramps up the output of the switching regulator, preventing it from overshooting as well as limiting the input current. The converter can be shutdown by pulling this pin below 0.5V.

Synchronous PWM Controller Anachip Corp „ Ordering Information AP2014/A X X Package Packing S: SOP-8L N: PDIP-8L Blank : Tube A : Taping „ Block Diagram SS Fb Comp GND LDrv Vcc HDrv Vc 25K 25K 1.25V POR 20uA 64uA Max Error Amp + OscillatorCt Error Comp S R Q Reset Dom Bias GeneratorVcc 4.0V Vc 3.5V 0.2V 0.2V 1.25V POR FbLo Comp 0.5V POR „ Absolute Maximum Ratings Symbol Parameter Range. Unit VCC Vcc Supply Voltage 20 V VC Vc Supply Voltage (not rated for inductive load) 32 V TST Storage Temperature Range -65 to 150 oC TJ Operating Junction Temperature Range 0 to 125 oC șJC Thermal Resistance Junction to Case 90 oC/W șJA Thermal Resistance Junction to Ambient 250 oC/W

Synchronous PWM Controller Anachip Corp „ Electrical Characteristics Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA=0 to 70°C. Typical values refer to TA =25°C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. Symbol Parameter Conditions Min. Typ. Max. Unit Reference Voltage LREG FB Voltage Line Regulation 5 < Vcc < 12 - 0.2 0.35 % UVLO UVLO Threshold - VCC 4.0 4.2 4.4 V UVLO VCC UVLO Hysteresis - VCC Supply Ramping Up - 0.25 - V UVLO Threshold - VC 3.1 3.3 3.5 V UVLO VC UVLO Hysteresis - VC Supply Ramping Up - 0.2 - V FB Ramping Down (AP2014) 0.4 0.6 0.8 V UVLO Threshold - FB FB Ramping Down (AP2014A) 0.3 0.4 0.5 V UVLO FB UVLO Hysteresis - FB - 0.1 - V Supply Current Operation ICC V CC Operation Supply Current Freq=200KHz, CL=1500pF - 7 10 mA Operation IC V C Operation Supply Current Freq=200KHz, CL=1500pF - 7 10 mA ICCQ V CC Static Supply Current SS=0V - 3.3 6 mA ICQ V C Static Supply Current SS=0V - 1 4.5 mA Soft-Start Section SSIB Charge Current SS=0V 10 20 30 µA Error Amp IFB1 FB Voltage Input Bias Current SS=3V, FB=1V - -0.1 - µA IFB2 FB Voltage Input Bias Current SS=0V, FB=1V - -64 - µA gm Transconductance 450 600 750 µmho Oscillator AP2014 170 200 230 KHzFreq Frequency AP2014A 340 400 460 KHz VRAMP Ramp-Amplitude Voltage 1.225 1.25 1.275 V Output Drivers Tr Rise Time C L =1500pF - 50 100 ns Tf Fall Time C L =1500pF - 50 100 ns TDB Dead Band Time 50 150 250 ns TON Max Duty Cycle FB=1V, Freq=200KHz 85 90 95 % TOFF Min Duty Cycle FB=1.5V 0 0 - %

Synchronous PWM Controller Anachip Corp „ Typical Application Circuit (1) 10nF AF9410N C17 0.1u VIN=5V C12 470u Vc=12V 470u Vout +1.5V/7.0A AF9410N 5.6u/9.0 22k AP2014 C13 470uC20 100p 0.47u 8.2 0.1u 3.3K C11 0.1u 820 8FB Vcc LDrv GND HDrv Vc Comp SS (2) Vout +1.5V/7.0A 0.47u 8.2 C13 470u 0.1uF C8 470u 1N4148 3.3K C11 0.1u AP2014 4 5 8FB Vcc LDrv GND HDrv Vc Comp SS C12 470u 820 AF9410N 6.8k VIN=12V C20 100p Option 0.1u 10nF AF9410N C17 0.1u 1N4148 100u 5.6u/9A Single Supply 12V Input

Synchronous PWM Controller Anachip Corp „ Typical Application Circuit (Continued) (3) Vout +5V/5.0A 0.47u 8.2 C13 470u 0.1uF C8 470u 1N4148 C11 0.1u AP2014 4 5 8FB Vcc LDrv GND HDrv Vc Comp SS 10K AF4910N-1 39k VIN=12V C20 100p 0.1u 10nF AF4910N-2 C17 0.1u 1N4148 100u 10uH/6A Single Supply 12V Input (4) Vout +5V/4.0A 0.47u 8.2 C13 470u 0.1uF C8 470u 1N4148 3.3K C11 0.1u AP2014 4 5 8FB Vcc LDrv GND HDrv Vc Comp SS 10K Q1-1 AF4928N-1 47k VIN=24V C20 100p 0.1u 10nF Q1-2 AF4928N-2 C17 0.1u 1N4148 100u 10uH/6A 1.2K RZD 8.2 ZD 6.2V IZD(Њ15mA)=(VIN-VD2-VZD)/RZD Single Supply 24V Input

Synchronous PWM Controller Anachip Corp „ Typical Application Circuit (Continued) (5) Dual Supply, 5V Bus and 12V Bias Input SS Fb Comp GND LDrv Vcc HDrv Vc AP2014 0.1uF 10nF 3.3K AF9410 10uH 100uF 1uH C4 47uF 1.8V/1A 2.5V/2A 0.1uF AP1187 12V SS Fb Comp GND LDrv Vcc HDrv Vc AP2014 C13 0.1uF C14 10nF 3.3K 1.65K AF9410 AF9410 C11 3.3V/1.8A C12 220uF 0.1uF 1uF 47uF C10 1uF 10uH AF9410 220uF Dual Supply, 5V Bus and 12V Bias Input

Synchronous PWM Controller Anachip Corp „ Typical Performance Characteristics Load Regulation 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% 1.2% 1.4% 1.6% 1.8% 2.0% Iout(A) Load Regulation (%) Efficiency v.s. Iout 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Iout(A) Efficiency (%) Line Regulation 1.240 1.245 1.250 1.255 1.260 Vin(V) Feedback Voltage (V) Line Regulation 2.500 2.505 2.510 2.515 2.520 2.525 2.530 Vin(V) Output Voltage (V) Frequency v.s. Vin 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 Vin(V) Frequency (KHz) Frequency v.s. Temperature 150.0 160.0 170.0 180.0 190.0 200.0 210.0 220.0 230.0 240.0 -40 -20 0 25 50 75 100 125 Temperature ( oC) Frequency (KHz)

Synchronous PWM Controller Anachip Corp „ Typical Performance Characteristics (Continued) Icc and Iccq v.s. Vin 3.00 5.00 7.00 9.00 11.00 13.00 15.00 4.5 5 7 9 11 12 15 Vin(V) Icc and Iccq (mA) Icc(mA) Iccq(mA) Ic and Icq v.s. Vin 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 4.5 5 7 9 11 12 15 Vin(V) Ic and Icq (mA) Ic(mA) Icq(mA) Icc and Ic v.s. Temperature 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 -40 -20 0 25 50 75 100 125 Temperature (oC) Icc and Ic (mA) Icc(mA) Ic(mA) Vfb v.s. Temperature 1.20 1.22 1.24 1.26 1.28 1.30 -40 -20 0 25 50 75 100 125 Temperature (oC) Feedback Voltage (V) AP2014A Ic and Icc vs Vc 3.0 5.0 7.0 9.0 11.0 13.0 15.0 17.0 19.0 21.0 6 8 10 12 14 16 18 20 22 24 Vc(V) Ic(mA) Icc(mA) AP2014 Ic and Icc vs Vc 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 6 8 10 12 14 16 18 20 22 24 Vc(V) Ic(mA) Icc(mA)

Synchronous PWM Controller Anachip Corp „ Typical Performance Characteristics (Continued) Vout Ripple Vcc=5V; Vc=12V; Vout=2.5V Iout=0.5A, Vripple=30.8mV Vout Ripple Vcc=5V; Vc=12V; Vout=2.5V Iout=5A, Vripple=33.2mV Dead time v.s. Iout Vcc=5V, Vc=12V, Vout=2.5V, Iout=0.5A, Temp=28oC Dead time = 150ns Dead time = 150ns Dead time v.s. Iout Vcc=5V, Vc=12V, Vout=2.5V, Iout=5A , Temp=28oC Dead time = 160ns Dead time = 150ns Highside GATE Lowside GATE Phase Lowside GATE Highside GATE Phase

Synchronous PWM Controller Anachip Corp „ Function Descriptions Introduction The AP2014 is a fixed frequency, voltage mode synchronous controller and consists of a precision reference voltage, an error amplifier, an internal oscillator, a PWM comparator, 0.5A peak gate driver, soft-start and shutdown circuits (see Block Diagram). The output voltage of the synchronous converter is set and controlled by the output of the error amplifier; this is the amplified error signal from the sensed output voltage and the reference voltage. This voltage is compared to a fixed frequency linear sawtooth ramp and generates fixed frequency pulses of variable duty-cycle, which drives the two N-channel external MOSFETs.The timing of the IC is provided through an internal oscillator circuit which uses on-chip capacitor to set the oscillation frequency to 200 KHz (400 KHz for “A” version). Soft-Start The AP2014 has a programmable soft-start to control the output voltage rise and limit the current surge at the start-up. To ensure correct start-up, the soft-start sequence initiates when the V C and V CC rise above their threshold (3.3V and 4.2V respectively) and generates the Power On Reset (POR) signal. Soft-start function operates by sourcing an internal current to charge an external capacitor to about 3V. Initially, the soft-start function clamps the E/A’s output of the PWM converter. As the charging voltage of the external capacitor ramps up, the PWM signals increase from zero to the point the feedback loop takes control. Short-Circuit Protection The outputs are protected against the short circuit. The AP2014 protects the circuit for shorted output by sensing the output voltage (through the external resistor divider). The AP2014 shuts down the PWM signals, when the output voltage drops below 0.6V (0.4V for AP2014A). The AP2014 also protects the output from over-voltaging when the control FET is shorted. This is done by turning on the sync FET with the maximum duty cycle. Under-Voltage Lockout The under-voltage lockout circuit assures that the MOSFET driver outputs remain in the off state whenever the supply voltage drops below set parameters. Lockout occurs if V C and VCC fall below 3.3V and 4.2V respectively. Normal operation resumes once VC and VCC rise above the set values. IC Quiescent Power Dissipation Power dissipation for IC controller is a function of applied voltage, gate driver loads and switching frequency. The IC's maximum power dissipation occurs when the IC operating with single 12V supply voltage (Vcc=12V and Vc#24V) at 400KHz switching frequency and maximum gate loads. Page 8 show voltage vs. current, when the gate drivers loaded with 1500pF capacitors. The IC's power dissipation results to an excessive temperature rise. This should be considered when using AP2014A for such application. „ Marking Information (Top View) SOP-8L/PDIP-8L AP2014 X YY WW X Logo Part No. ID code: internal Year: "01" =2001 "02" =2002 Xth week: 01~52 AP2014 : 200KHz (OSC) AP2014A : 400KHz (OSC)

Synchronous PWM Controller Anachip Corp „ Package Information Package Type: SOP-8L 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 T 0O - 8 O 0 O - 8 O

Synchronous PWM Controller Anachip Corp „ Package Information (Continued) Package Type: PDIP-8L 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