AP3502EMTR-G1

NOT RECOMMENDED FOR NEW DESIGN CONTACT US AP3502E 340KHZ 2A SYNCHRONOUS DC-DC BUCK CONVERTER Description Pin Assignments The AP3502E is a 340kHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 2A load with high efficiency, excellent line and load regulation. The AP3502E exhibits high efficiency at light load. The device integrates N-channel power MOSFET switches with low on-resistance. Current mode control provides fast transient response and cycle-by-cycle current limit. (Top View) The AP3502E employs complete protection to ensure system security. Including output Over Voltage Protection, input Under Voltage Lock Out, programmable Soft Start, Over Temperature Protection and hiccup mode Short Circuit Protection. BS 1 8 SS IN 2 7 EN SW 3 6 COMP GND 4 5 FB SOIC-8 This IC is available in SOIC-8 package. 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 AP3502E Document number: DS41524 Rev. 4 - 3 Applications • LCD TV • Set Top Box • Portable DVD • Digital Photo Frame 1 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Typical Applications Circuit Input Voltage=12V 1 Output Voltage=3.3V L 10μH C4 10nF 2 3 4 C22 C21 22μF/25V 22μF/25V BS IN SW GND AP3502E R4 100k SS EN COMP FB D1 Optional C11 10μF/25V 8 C5 0.1μF 7 C6 Optional 6 C3 4.7nF 5 R3 13k R2 10k R1 26.1k Pin Descriptions Pin Number Pin Name 1 BS 2 IN 3 SW Power switch output pin. This pin is connected to the inductor and bootstrap capacitor 4 GND Ground pin 5 FB 6 COMP 7 EN 8 SS AP3502E Document number: DS41524 Rev. 4 - 3 Function 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 Supply power input pin. A capacitor should be connected between the IN pin and GND pin to keep the input voltage constant 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 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 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 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 2 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Functional Block Diagram IN 2 SHUTDOWN 1.5V COMPARATOR VA INTERNAL REGULATOR 0.3V SCP VB SLOP COMP CURRENT SENSE AMPLIFIER VA + OSCILLATOR 90K/340K 1 CLK LOCK EN COMPARATOR 7 BS M1 S Q R Q PWM COMPARATOR 3 SW M2 2.5V VB 1.1V SS 8 5 µA 0. 925V FB Document number: DS41524 Rev. 4 - 3 GND EA 5 AP3502E 4 6 COMP 3 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Absolute Maximum Ratings (Note 1) Symbol 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 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 -65 to +150 °C VCOMP Note 1: Parameter TSTG Storage Temperature TLEAD Lead Temperature (Soldering, 10s) +260 °C VHBM ESD (Human Body Model) 2000 V VMM ESD (Machine Model) 200 V Stresses greater than those listed under “Absolute Maximum Ratings” can 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 can 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 AP3502E Document number: DS41524 Rev. 4 - 3 4 of 11 www.diodes.com February 2020 © 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 Shutdown Supply Current VEN=0V — 0.1 10 μA 3.65 4.00 4.25 V ISHDN UNDER VOLTAGE LOCKOUT VUVLO Input UVLO Threshold VIN Rising VHYS Input UVLO Hysteresis — — 200 — mV ENABLE (EN PIN) — EN Shutdown Threshold Voltage — 1.1 1.5 2 V — EN1Shutdown1Threshold1Voltage1Hysteresis (Note 3) — — 350 — mV — EN Lockout Threshold Voltage — 2.2 2.5 2.7 V — EN Lockout Hysteresis — — 210 — mV Feedback Voltage — 0.907 0.925 0.943 V Feedback Over Voltage Threshold — — 1.1 — V Feedback Bias Current VFB=1V -0.1 — 0.1 μA 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 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 VOLTAGE REFERENCE (FB PIN) VFB VFBOV IFB MOSFET CURRENT LIMIT ILEAKH SWITCHING REGULATOR fOSC1 Oscillator Frequency — 280 340 400 kHz fOSC2 Short Circuit Oscillator Frequency — — 90 — kHz DMAX Maximum Duty Cycle VFB=0.85V — 90 — % DMIN Minimum Duty Cycle VFB=1V — — 0 % AP3502E Document number: DS41524 Rev. 4 - 3 5 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Electrical Characteristics (continued) (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) Notes: tSS Soft-start Time (Note 3) C5=0.1μF — 15 — ms — Soft-start Current — — 5 — μA 2. RDSON= VSW1 - VSW2 ISW1 - ISW2 3. Not tested, guaranteed by design. AP3502E Document number: DS41524 Rev. 4 - 3 6 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Performance Characteristics (TA=+25°C, VIN=12V, VOUT=3.3V, unless otherwise noted.) Efficiency vs. Load Current Quiescent Current vs. Temperature 1.4 100 90 1.3 Quiescent Current (mA) 80 Efficiency (%) 70 60 50 40 VOUT=3.3V,L=10µH TA=25oC 30 VIN=5V VIN=12V 20 1.2 1.1 1.0 0.9 10 0.01 0.1 Load Current (A) 1 10 -50 0 25 50 75 100 125 150 Temperature (oC) Feedback Voltage vs. Temperature 0.94 -25 Output Voltage vs. Load Current 3.6 3.5 Output Voltage (V) Feedback Voltage (V) 0.93 0.92 0.91 3.4 3.3 3.2 3.1 3.0 0.90 -50 -25 0 25 50 75 100 125 0.0 0.4 0.8 1.2 1.6 2.0 2.4 Load Current (A) 150 Temperature (oC) Output Voltage vs. Input Voltage 3.6 Maximum Load Current vs. Input Voltage 4.0 3.6 3.4 Max Load Current (A) Output Voltage (V) 3.5 3.3 3.2 3.1 3.0 3.2 2.8 2.4 2.0 1.6 4 8 12 16 20 1.2 Input Voltage (V) AP3502E VOUT=3.3V,L=10µH Document number: DS41524 Rev. 4 - 3 7 of 11 www.diodes.com 4 8 12 Input Voltage (V) 16 20 February 2020 © Diodes Incorporated AP3502E Performance Characteristics (continued) (TA=+25°C, VIN=12V, VOUT=3.3V, unless otherwise noted.) Output Ripple (IOUT=2A) Load Transient (IOUT=1A to 2A) VIN(AC) 500mV/div VOUT (AC) 20mV/div VOUT (AC) 100mV/div IL 1A/div IOUT 1A/div VSW 10V/div Time 2μs/div Time 400μs/div Enable Turn-on Characteristic (VIN=12V, VEN=3.3V, VOUT=3.3V, IOUT=2A) Enable Turn-off Characteristic (VIN=12V, VEN=3.3V, VOUT=3.3V, IOUT=2A) VEN 2V/div VEN 2V/div VSS 2V/div VSS 2V/div VOUT 2V/div VOUT 2V/div IL 1A/div IL 1A/div Time 4ms/div Time 200μs/div Short Circuit Protection (IOUT=2A) VOUT 2V/div Short Circuit Recovery (IOUT=2A) VOUT 2V/div VSW 10V/div VSW 10V/div VSS 1V/div VSS 1V/div IL 2A/div IL 2A/div Time 40ms/div AP3502E Document number: DS41524 Rev. 4 - 3 Time 40ms/div 8 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Ordering Information AP3502E XX XX - XX Product Name Package M : SOIC-8 Package SOIC-8 AP3502E Document number: DS41524 Rev. 4 - 3 Temperature Range -40 to +85°C Packing RoHS/Green TR : Tape & Reel Blank : Tube G1:RoHS Compliant and Green Part Number Marking ID Packing AP3502EM-G1 3502EM-G1 Tube AP3502EMTR-G1 3502EM-G1 Tape and Reel 9 of 11 www.diodes.com February 2020 © Diodes Incorporated AP3502E Package Outline Dimensions (All dimensions in mm(inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SOIC-8 4.700(0.185) 5.100(0.201) 7° 7° 1.750(0.069) 0.675(0.027) 1.270(0.050) 0.320(0.013) 1.350(0.053) 0.725(0.029) 8° 8° D 5.800(0.228) 6.200(0.244) TYP D 20:1 0.300(0.012) R0.150(0.006) 0.100(0.004) 1.000(0.039) 0.800(0.031) 0.200(0.008) 0° 8° 3.800(0.150) 4.000(0.157) 0.330(0.013) 0.510(0.020) 0.190(0.007) 0.250(0.010) 0.900(0.035) 1° 5° R0.150(0.006) 0.450(0.017) 0.800(0.031) Note: Eject hole, oriented hole and mold mark is optional. AP3502E Document number: DS41524 Rev. 4 - 3 10 of 11 www.diodes.com February 2020 © 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). 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