AP3502F

AP3502F

Document overview

• Manufacturer or author: Diodes Incorporated
• PDF pages: 11

Technical content

Features

• Input Voltage Range: 4.5V to 18V
• Fixed 340kHz Frequency
• High Efficiency: up to 95%
• Output Current: 2A
• Current Mode Control
• Built-In Over Current Protection
• Built-In Thermal Shutdown Function
• Built-In UVLO Function
• Built-In Over Voltage Protection
• Programmable Soft-start Pin Assignments (Top View) SOIC-8

Applications

• LCD TV
• Set Top Box
• Portable DVD
• Digital Photo Frame BS IN SW GND FB COMP EN SS PART OBSOLETE – CONTACT US

Document number: DS41525 Rev. 3 - 4 2 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Typical Applications Circuit 4.7nF C11 10μF/25V C22 22μF/25V Optional L 10μH 100k R2 10k 26.1k 13k Optional 10nF 0.1μF AP3502F BS IN SW GND FB COMP EN SS C21 22μF/25V Input Voltage=12V Output Voltage=3.3V 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 power MOSFET 2 IN Supply power input pin. A capacitor should be connected between the IN pin and GND pin to keep the input voltage constant 3 SW Power switch output pin. This pin is connected to the inductor and bootstrap capacitor

4 GND Ground pin

Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. When the FB pin voltage exceeds 1.1V, the over voltage protection is triggered. When the FB pin voltage is below 0.3V, the oscillator frequency is lowered to realize short circuit protection

6 COMP

Compensation pin. This pin is the output of the transconductance error amplifier and the input to the current comparator. It is used to compensate the control loop. Connect a series RC network from this pin to GND. In some cases, an additional capacitor from this pin to GND pin is required 7 EN Control input pin. EN is a digital input that turns the regulator on or off. Drive EN high/low to turn on/off the regulator. Pull up with 100kΩ resistor for automatic startup 8 SS Soft-start control input pin. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To disable the soft -start feature, leave SS unconnected

Document number: DS41525 Rev. 3 - 4 3 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Functional Block Diagram S R Q Q INTERNAL REGULATOR OSCILLATOR VA BS SW GND EA COMPFB EN IN COMPARATOR SS CURRENT SENSE AMPLIFIER CLK SLOP COMP PWM COMPARATOR 1.1V SCP VA VB VB 6µA 90k/340k 0.925V 2.5V 0.3V COMPARATOR1.5V SHUTDOWN LOCK

Document number: DS41525 Rev. 3 - 4 4 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Absolute Maximum Ratings (Note 1) Symbol Parameter Value Unit VIN IN Pin Voltage -0.3 to 20 V VEN EN Pin Voltage -0.3 to VIN V VSW SW Pin Voltage 21 V VBS BS Pin Voltage -0.3 to VSW+6 V VFB FB Pin Voltage -0.3 to 6 V VCOMP COMP Pin Voltage -0.3 to 6 V VSS SS Pin Voltage -0.3 to 6 V θJA Thermal Resistance 105 ºC/W TJ Operating Junction Temperature +150 ºC TSTG Storage Temperature -65 to +150 ºC TLEAD Lead Temperature (Soldering, 10sec) +260 ºC VHBM ESD (Human Body Model) 2000 V VMM 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 stres s 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 Parameter Min Max Unit VIN Input Voltage 4.5 18 V TA Operating Ambient Temperature -40 +85 ºC

Document number: DS41525 Rev. 3 - 4 5 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Electrical Characteristics (TA=+25ºC, VIN=VEN=12V, VOUT=3.3V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit SUPPLY VOLTAGE (IN PIN) VIN Input Voltage _ 4.5 _ 18 V IQ Quiescent Current VFB=1V,VEN=3V _ 1.2 1.4 mA ISHDN Shutdown Supply Current VEN=0V _ 0.1 10 μA UNDER VOLTAGE LOCKOUT VUVLO Input UVLO Threshold VIN Rising 3.65 4.00 4.25 V VHYS Input UVLO Hysteresis _ _ 200 _ mV ENABLE (EN PIN) _ EN Shutdown Threshold Voltage _ 1.1 1.5 2 V _ EN Shutdown Threshold Voltage Hysteresis (Note 2) _ _ 350 _ mV _ EN Lockout Threshold Voltage _ 2.2 2.5 2.7 V _ EN Lockout Hysteresis _ _ 210 _ mV VOLTAGE REFERENCE (FB PIN) VFB Feedback Voltage _ 0.907 0.925 0.943 V VFBOV Feedback Over Voltage Threshold _ _ 1.1 _ V IFB Feedback Bias Current VFB=1V -0.1 _ 0.1 μA MOSFET RDSONH High-side Switch On-resistance(Note 3) ISW=0.2A/0.7A _ 100 _ mΩ RDSONL Low-side Switch On-resistance(Note 3) ISW=-0.2A/-0.7A _ 100 _ mΩ CURRENT LIMIT ILEAKH High-side Switch Leakage Current VIN=18V,VEN=VSW=0V _ 0.1 10 μA ILIMH High-side Switch Current Limit _ 2.7 3.5 _ A ILIML Low-side Switch Current Limit From Drain to Source _ 1.4 _ A SWITCHING REGULATOR fOSC1 Oscillator Frequency _ 280 340 400 kHz fOSC2 Short Circuit Oscillator Frequency _ _ 90 _ kHz DMAX Max. Duty Cycle VFB=0.85V _ 90 _ % DMIN Min. Duty Cycle VFB=1V _ _ 0 %

Document number: DS41525 Rev. 3 - 4 6 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Electrical Characteristics (Cont. TA=+25ºC, VIN=VEN=12V, VOUT=3.3V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit ERROR AMPLIFIER AEA Error Amplifier Voltage Gain (Note 2) _ _ 400 _ V/V GEA Error Amplifier Transconductance _ _ 800 _ μA/V GCS COMP to Current Sense Transconductance _ _ 3.5 _ A/V THERMAL SHUTDOWN TOTSD Thermal Shutdown (Note 2) _ _ +160 _ ºC THYS Thermal Shutdown Hysteresis (Note 2) _ _ +30 _ ºC SOFT START (SS PIN) tSS Soft-start Time (Note 2) CSS=0.1μF _ 15 _ ms _ Soft-start Current VSS=0V _ 6 _ μA Notes: 2. Not tested, guaranteed by design. 3. RDSON= SW2SW1 SW2SW1 I-I V-V

Document number: DS41525 Rev. 3 - 4 7 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Performance Characteristics (TA=+25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.) Efficiency vs. Output Current Quiescent Current vs. Case Temperature Feedback Voltage vs. Case Temperature Output Voltage vs. Output Current High-side Switch On-resistance Low-side Switch On-resistance vs. Case Temperature vs. Case Temperature 100 Efficiency (%) Output Current (A) VOUT=3.3V, L=10µH, TA=25 o C VIN=5V VIN=12V -50 -25 0 25 50 75 100 125 150 0.9 1.0 1.1 1.2 1.3 1.4 Quiescent Current (mA) Case Temperature ( o -50 -25 0 25 50 75 100 125 150 0.6 0.7 0.8 0.9 1.0 1.1 1.2 Feedback Voltage (V) Case Temperature ( o 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Output Voltage (V) Output Current (A) -60 -40 -20 0 20 40 60 80 100 120 140 100 120 140 160 180 200 High-side Switch On-resistance (mΩ) Case Temperature ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 120 140 160 Low-side Switch On-resistance (mΩ) Case Temperature ( o

Document number: DS41525 Rev. 3 - 4 8 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Performance Characteristics (Cont. TA=+25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.) Output Ripple (IOUT=2A) Load Transient (IOUT =1A to 2A) Enable Turn on Characteristic Enable Turn off Characteristic (VIN=12V, VEN=3.3V, VOUT=3.3V, IL=2A) (VIN=12V, VEN=3.3V, VOUT=3.3V, IL=2A) Short Circuit Protection (IOUT=0A) Short Circuit Recovery (IOUT=0A) VIN_AC 200mV/di VOUT_AC 20mV/div IL 1A/div VSW 10V/div Time 2μs/div VOUT_AC 100mV/div IOUT 1A/div Time 200μs/div VEN 2V/div VSS 2V/div VOUT 2V/div IL 1A/div Time 10ms/div VEN 2V/div VSS 2V/div VOUT 2V/div IL 1A/div Time 200μs/div VOUT 2V/div IL 2A/div VOUT 2V/div IL 2A/div Time 40μs/div Time 40μs/div

Document number: DS41525 Rev. 3 - 4 9 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED

Ordering Information

PackingPackageProduct Name TR : Tape & ReelM : SOIC-8 RoHS/Green Blank : Tube G1:RoHS Compliant and Green Package Temperature Range Part Number Marking ID Packing SOIC-8 -40 to +85°C AP3502FM-G1 3502FM-G1 Tube AP3502FMTR-G1 3502FM-G1 Tape & Reel

Document number: DS41525 Rev. 3 - 4 10 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SOIC-8 R0.150(0.006) R0.150(0.006) 1.000(0.039) 0.330(0.013) 0.510(0.020) 1.350(0.053) 1.750(0.069) 0.100(0.004) 0.300(0.012) 0.900(0.035) 0.800(0.031) 0.200(0.008) 3.800(0.150) 4.000(0.157) 20:1 D 1.270(0.050) TYP 0.190(0.007) 0.250(0.010) D 5.800(0.228) 6.200(0.244) 0.675(0.027) 0.725(0.029) 0.320(0.013) 0.450(0.017) 0.800(0.031) 4.700(0.185) 5.100(0.201) Note: Eject hole, oriented hole and mold mark is optional.

Document number: DS41525 Rev. 3 - 4 11 of 11 www.diodes.com July 2021 © Diodes Incorporated AP3502F OBSOLETE – PART DISCONTINUED IMPORTANT NOTICE 1. DIODES INCORPORATED AND ITS SUBSIDIARIES (“DIODES”) MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTIC ULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operati on of Diodes products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engi neering customers and users who design with Diodes products. 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