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Document overview
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- PDF pages: 11
Technical content
Features
Input Voltage Range: 4.5V to 18V Fixed 340kHz Frequency High Efficiency at Light Load 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 Hiccup Mode SCP 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
Document number: DS41524 Rev. 2 - 2 2 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Typical Applications Circuit 4.7nF C11 10μF/25V C22 22μF/25V Optional L 10μH 100k R2 10k 26.1k 13k Optional 10nF 0.1μF AP3502E 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: DS41524 Rev. 2 - 2 3 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Functional Block Diagram S R Q Q INTERNAL REGULATOR OSCILLATOR VA BS SW GND EA COMPFB EN IN COMPARATOR 8SS CURRENT SENSE AMPLIFIER CLK SLOP COMP PWM COMPARATOR 1.1V SCP VA VB VB 5 mA 90K/340K 0. 925V 2.5V 0.3V COMPARATOR1.5V SHUTDOWN LOCK
Document number: DS41524 Rev. 2 - 2 4 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E 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 °C/W TJ Operating Junction Temperature +150 °C TSTG Storage Temperature -65 to +150 °C TLEAD Lead Temperature (Soldering, 10sec) +260 °C 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 Condi tions” 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 °C
Document number: DS41524 Rev. 2 - 2 5 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Electrical Characteristics (TA=+25°C, 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 _ EN1Shutdown1Threshold1Voltage1Hystere- sis (Note 3) _ _ 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 2) ISW=0.2A/0.7A _ 100 _ mΩ RDSONL Low-side Switch On-resistance (Note 2) 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 Drain to Source _ 0 _ mA 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: DS41524 Rev. 2 - 2 6 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Electrical Characteristics (Cont. TA=+25°C, VIN=VEN=12V, VOUT=3.3V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit ERROR AMPLIFIER AEA Error Amplifier Voltage Gain (Note 3) _ _ 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 3) _ _ +160 _ °C THYS Thermal Shutdown Hysteresis (Note 3) _ _ +30 _ °C SOFT START (SS PIN) tSS Soft-start Time (Note 3) C5=0.1μF _ 15 _ ms _ Soft-start Current _ _ 5 _ μA Notes: 2. RDSON= SW2SW1 SW2SW1 I-I V-V 3. Not tested, guaranteed by design.
Document number: DS41524 Rev. 2 - 2 7 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Performance Characteristics (TA=+25°C, VIN=12V, VOUT=3.3V, unless otherwise noted.) Efficiency vs. Load Current Quiescent Current vs. Temperature Feedback Voltage vs. Temperature Output Voltage vs. Load Current Output Voltage vs. Input Voltage Maximum Load Current vs. Input Voltage -50 -25 0 25 50 75 100 125 150 0.9 1.0 1.1 1.2 1.3 1.4 Quiescent Current (mA) Temperature ( o 0.01 0.1 1 10 100 Efficiency (%) Load Current (A) VOUT=3.3V,L=10mH TA=25 o C VIN=5V VIN=12V -50 -25 0 25 50 75 100 125 150 0.90 0.91 0.92 0.93 0.94 Feedback Voltage (V) Temperature ( o 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Output Voltage (V) Load Current (A) 4 8 12 16 20 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Output Voltage (V) Input Voltage (V) 4 8 12 16 20 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 Max Load Current (A) Input Voltage (V) VOUT=3.3V,L=10mH
Document number: DS41524 Rev. 2 - 2 8 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Performance Characteristics (Cont. TA=+25°C, 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, IOUT=2A) (VIN=12V, VEN=3.3V, VOUT=3.3V, IOUT=2A) Short Circuit Protection (IOUT=2A) Short Circuit Recovery (IOUT=2A) VIN(AC) 500mV/div VOUT (AC) 20mV/div IL 1A/div VSW 10V/div Time 2μs/div VOUT (AC) 100mV/div IOUT 1A/div Time 400μs/div VEN 2V/div VSS 2V/div VOUT 2V/div IL 1A/div Time 4ms/div VEN 2V/div VSS 2V/div VOUT 2V/div IL 1A/div Time 200μs/div VOUT 2V/div VSW 10V/div VSS 1V/div IL 2A/div Time 40ms/div VOUT 2V/div VSW 10V/div VSS 1V/div IL 2A/div Time 40ms/div
Document number: DS41524 Rev. 2 - 2 9 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E
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 +85C AP3502EM-G1 3502EM-G1 Tube AP3502EMTR-G1 3502EM-G1 Tape and Reel
Document number: DS41524 Rev. 2 - 2 10 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E Package Outline Dimensions (All dimensions in mm.) (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: DS41524 Rev. 2 - 2 11 of 11 www.diodes.com October 2018 © Diodes Incorporated AP3502E 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). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license unde r its patent or trademark rights, nor the rights of others. Any Customer or user of th is document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diod es Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, internation al or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into mul tiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or support that may be pr ovided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2018, Diodes Incorporated www.diodes.com