AP3211 1.4MHZ,1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER Description Pin Assignments The AP3211 is a 1.4MHz fixed frequency, current mode, PWM buck (step-down) DC-DC converter, capable of driving a 1.5A load with high efficiency, excellent line and load regulation. The device integrates N-channel power MOSFET switch with low on-resistance. Current mode control provides fast transient response and cycle-bycycle current limit. (Top View) Pin 1 Mark A standard series of inductors are available from several different manufacturers optimized for use with the AP3211. This feature greatly simplifies the design of switch-mode power supplies. The AP3211 is available in SOT-23-6 package. BS 1 6 SW GND 2 5 IN FB 3 4 EN Features Input Voltage Range: 4.5V to 18V Output Voltage Adjustable from 0.81V to 15V Fixed 1.4MHz Frequency High Efficiency: up to 92% Output Current: 1.5A Current Mode Control Built-In Over Current Protection Built-In Thermal Shutdown Function Built-In UVLO Function Built-In Over Voltage Protection Built-In Soft-Start SOT-23-6 Applications LCD TV DPF Portable DVD Typical Applications Circuit VIN=12V C1 ON OFF AP3211 Document number: DS41396 Rev. 2 - 2 BS AP3211 10mF 25V IN EN CB 10nF L1 4.7mH SW D1 R1 49.9k C2 VOUT=3.3V (1.5A) 22mF 6.3V FB GND R2 16.3k 1 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Pin Descriptions Pin Number Pin Name Function 1 BS Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage across the bootstrap capacitor drives the internal high-side NMOS switch. 2 GND 3 FB 4 EN 5 IN 6 SW Ground pin Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. When VFB exceeds 20% of the nominal regulation value of 0.81V, the OVP is triggered. When VFB < 0.25V, the oscillator frequency is lowered to realize short circuit protection. Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this pin below 0.4V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1A. Supply input pin. A capacitor should be connected between the IN pin and GND to keep the DC input voltage constant. Power switch output pin. This pin is connected to the inductor and bootstrap capacitor. Functional Block Diagram IN 5 SCHOTTKEY FB VREF SS HICCUP 1 BOOSTRAP REGULATOR BS CL 2 VDD/VDD1 REGULATOR GND 2A/V OSC 1.4MHz/ 400KHz RAMP GENERATOR CS OSC 1pF S Q VLIMIT EN 4 3.3V SS 3 AP3211 Document number: DS41396 Rev. 2 - 2 SWITCH/LDO R 27pF 1M FB CL REFERENCE VOLTAGE 220k 6 SW R ERR AMP PWM COMPARATOR 2 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Absolute Maximum Ratings (Note 1) Symbol Parameter Rating Unit -0.3 to 20 V VIN Input Pin Voltage VEN EN Pin Voltage -0.3 to VIN+0.3 V VSW SW Pin Voltage 21 V VBS Bootstrap Pin Voltage -0.3 to VSW+6 V VFB Feedback Pin Voltage -0.3 to 6V V JA Thermal Resistance 220 C/W TJ Operating Junction Temperature +150 C -65 to +150 C TSTG Storage Temperature TLEAD Lead Temperature (Soldering, 10sec) +260 C - ESD (Human Body Model) 2000 V - ESD (Machine Model) 200 V Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Symbol VIN IOUT (MAX) TA Parameter Min Max Unit Input Voltage 4.5 18 V Maximum Output Current 1.5 - A Operating Ambient Temperature -40 +85 C AP3211 Document number: DS41396 Rev. 2 - 2 3 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Electrical Characteristics (VIN = VEN = 12V, VOUT = 3.3V, TA = +25C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit 4.5 - 18 V VIN Input Voltage - IQ Quiescent Current VFB = 0.9V - 0.8 1.1 mA ISHDN Shutdown Supply Current VEN = 0V - 0.1 1.0 A VFB Feedback Voltage - 0.785 0.810 0.835 V Feedback Over Voltage Threshold - - 0.972 - V Feedback Bias Current VFB = 0.85V -0.1 - 0.1 A Switch On-resistance ISW = 1A - 0.35 - ILEAK Switch Leakage Current VIN = 18V, VEN = 0V - 0.1 10 A ILIM Switch Current Limit - 1.8 2.4 - A - 1.5 - - - - - 0.4 3.3 3.8 4.3 V VFBOV IFB RDSON VENH EN Pin Threshold VENL V VUVLO Input UVLO Threshold VIN Rising VHYS Input UVLO Hysteresis - - 0.2 - V - 1.1 1.4 1.7 MHz Short Circuit - 460 - kHz fOSC1 Oscillator Frequency fOSC2 DMAX Max. Duty Cycle VFB = 0.6V - 90 - % DMIN Min. Duty Cycle VFB = 0.9V - - 0 % tON Minimum On Time - - 100 - ns TOTSD Thermal Shutdown - - +160 - C THYS Thermal Shutdown Hysteresis - - +20 - C Soft-start Time - - 200 - s tSS Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design. AP3211 Document number: DS41396 Rev. 2 - 2 4 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Performance Characteristics (TA = +25C, VIN = 12V, VEN = 5V, VOUT = 3.3V, unless otherwise noted.) Efficiency vs. Output Current Quiescent Current vs. Temperature 1.10 90 1.05 80 1.00 Quiescent Current (mA) 100 Efficiency (%) 70 60 50 40 30 VIN=12V,VOUT=3.3V 20 VIN=12V,VOUT=5V 10 0 0.01 0.1 0.5 1 2 0.95 0.90 0.85 0.80 0.75 VIN=12V 0.70 VFB=0.9V 0.65 VEN=5V 0.60 -60 -40 -20 0 40 60 80 100 120 140 160 Temperature ( C) Feedback Voltage vs. Temperature Output Voltage vs. Output Current 0.96 3.8 0.88 3.6 3.4 0.80 Output Voltage (V) Feedback Voltage (V) 20 o Output Current (A) 0.72 0.64 0.56 3.2 3.0 2.8 2.6 0.48 VIN=12V, VOUT=3.3V 2.4 0.40 -60 -40 -20 0 20 40 60 80 100 120 140 2.2 0.0 160 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 Output Current (A) o Temperature ( C) Output Voltage vs. Input Voltage Maximum Output Current vs. Input Voltage 3.0 3.8 2.8 3.7 2.6 Maximum Output Current (A) 3.6 Output Voltage (V) 3.5 3.4 3.3 3.2 3.1 3.0 2.9 IOUT=1.2A 2.8 IOUT=1.5A 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 VOUT=3.3V 0.6 0.4 2.7 0.2 2.6 4 6 8 10 12 14 16 18 20 Input Voltage (V) AP3211 Document number: DS41396 Rev. 2 - 2 4 6 8 10 12 14 16 18 20 Input Voltage (V) 5 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Performance Characteristics (Cont. TA = +25C, VIN = 12V, VEN = 5V, VOUT = 3.3V, unless otherwise noted.) Output Ripple (IOUT=1.5A) Load Transient (IOUT=1 to 1.5A) VOUT (AC) 20mV/div VSW 5V/div VOUT (AC) 100mV/div IL 1A/div IL 1A/div VIN 10V/div Time (100ms/div) Time (400ns/div) Enable Turn-off Characteristic (Resistance Load, RLOAD=2.6) Enable Turn-on Characteristic (Resistance Load, RLOAD=2.6) VEN 3.4V/div VOUT 1V/div VEN 3.8V/div VOUT 1V/div VSW 5V/div VSW 5V/div IL 1A/div IL 1A/div Time (100ms/div) Time (10ms/div) Short Circuit Protection (IOUT=1.5A) Short Circuit Recovery (RLOAD=2.6) VOUT 2V/div VOUT 2V/div VFB 1V/div VFB 1V/div IL 1A/div IL 1A/div VSW 10V/div VSW 10V/div Time (400ms/div) Time (400ms/div) AP3211 Document number: DS41396 Rev. 2 - 2 6 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Performance Characteristics (Cont. TA = +25C, VIN = 12V, VEN = 5V, VOUT = 3.3V, unless otherwise noted.) Over Voltage Recovery (IOUT=1.5A) Over Voltage Protection (IOUT=1.5A) VFB 500mV/div VFB 500mV/div VOUT 2V/div VOUT 2V/div IL 1A/div IL 1A/div VSW 10V/div VSW 10V/div Time (20ms/div) AP3211 Document number: DS41396 Rev. 2 - 2 Time (200ms/div) 7 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Ordering Information AP3211 X X - X Package Packing RoHS/Green K : SOT-23-6 TR : Tape & Reel G1:RoHS Compliant and Green Product Name Package Temperature Range SOT-23-6 -40 to +85C AP3211 Document number: DS41396 Rev. 2 - 2 Part Number AP3211KTR-G1 8 of 11 www.diodes.com Marking ID GCI Packing Tape & Reel September 2018 (c) Diodes Incorporated AP3211 Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SOT-23-6 0 2.820(0.111) 8 3.100(0.122) 0.300(0.012) 0.500(0.020) 5 4 2 3 0.300(0.012) 0.600(0.024) 1.500(0.059) 1.700(0.067) 2.650(0.104) 3.000(0.118) 6 0.200(0.008) Pin 1 Mark 1 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.150(0.006) 1.800(0.071) 2.000(0.079) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.450(0.057) MAX 1.300(0.051) AP3211 Document number: DS41396 Rev. 2 - 2 9 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 Suggested Pad Layout (1) Package Type: SOT-23-6 E E Y G Z X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch) Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 AP3211 Document number: DS41396 Rev. 2 - 2 10 of 11 www.diodes.com September 2018 (c) Diodes Incorporated AP3211 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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Copyright (c) 2018, Diodes Incorporated www.diodes.com AP3211 Document number: DS41396 Rev. 2 - 2 11 of 11 www.diodes.com September 2018 (c) Diodes Incorporated Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Diodes Incorporated: AP3211KTR-G1