AP3512E

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 14

Technical content

Features

  • Input Voltage Range: 4.5V to 18V
  • Fixed 500kHz Frequency
  • High Efficiency at Light Load
  • 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
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3) Pin Assignments (Top View) SO-8 (Top View) SO-8EP

Applications

  • Monitor
  • TV
  • STB
  • Datacom Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen - and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which c ontain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. BS IN SW GND SS EN COMP FB BS IN SW GND SS EN COMP FB EP NOT RECOMMENDED FOR NEW DESIGN CONTACT US AP3512E Document number: DS38502 Rev. 4 - 3 1 of 14 www.diodes.com February 2020 © Diodes Incorporated

Typical Applications Circuit CC COUT 22µF*2 L REN 100k RC CP Optional CBS 10nF CSS 0.1µF AP3512E BS IN SW GND FB COMP EN SS Input Voltage =12V Output Voltage=3.3V CIN 10µF*2 4.7µH 3.3nF 10k 10k 26.1k 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 IN Supply input pin. A capacitor should be connected between the IN pin and GND pin to keep the DC 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 low ered 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. This pin is used to compensate the control loop. Connect a series RC network from this pin to GND pin. In some cases, an additional capacitor from this pin to GND pin is required. 7 EN Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low to turn off. 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. – EP Exposed pad. It should be connected to GND in PCB layout. AP3512E Document number: DS38502 Rev. 4 - 3 2 of 14 www.diodes.com February 2020 © Diodes Incorporated

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 5µA 180K/500K 0.925V 2.5V 0.3V COMPARATOR1.5V SHUTDOWN LOCK AP3512E Document number: DS38502 Rev. 4 - 3 3 of 14 www.diodes.com February 2020 © Diodes Incorporated

Absolute Maximum Ratings (Note 4) 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 TJ Operating Junction Temperature +150 °C TSTG Storage Temperature -65 to +150 °C TLEAD Lead Temperature (Soldering, 10s) +260 °C θJA Thermal Resistance (Junction to Ambient) SO-8 105 °C/W SO-8EP 60 VHBM ESD (Human Body Model) 2000 V VMM ESD (Machine Model) 200 V Note 4: 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 AP3512E Document number: DS38502 Rev. 4 - 3 4 of 14 www.diodes.com February 2020 © Diodes Incorporated

Electrical Characteristics (VIN=VEN=12V, VOUT=3.3V, TA=+25°C, 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=3.3V — 1.2 1.4 mA ISHDN Shutdown Supply Current VEN=0V — 0.1 1.0 µA UNDER VOLTAGE LOCKOUT VUVLO Input UVLO Threshold VIN Rising 3.65 4.0 4.25 V VHYS Input UVLO Hysteresis — — 0.2 — V ENABLE (EN PIN) — EN Shutdown Threshold Voltage — 1.1 1.5 2 V — EN Shutdown Threshold Voltage Hysteresis (Note 5) — — 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 6) ISW=0.2A and 0.7A — 100 — mΩ RDSONL Low-Side Switch On-resistance (Note 6) ISW=-0.2A and -0.7A — 100 — mΩ CURRENT LIMIT ILEAKH High-Side Switch Leakage Current VIN=18V, VEN=0V, VSW=0V — 0.1 10 μA ILIMH High-Side Switch Current Limit — 4.3 5.6 — A ILIML Low-Side Switch Current Limit From drain to source — 50 — mA SWITCHING REGULATOR fOSC1 Oscillator Frequency — 410 500 590 kHz fOSC2 Short Circuit Oscillator Frequency — — 180 — kHz DMAX Maximum Duty Cycle VFB=0.85V — 90 — % DMIN Minimum Duty Cycle VFB=1V — — 0 % ERROR AMPLIFIER AEA Error Amplifier Voltage Gain (Note 5) — — 400 — V/V GEA Error Amplifier Transconductance — — 800 — μA/V GCS COMP to Current Sense Transconductance — — 5.2 — A/V AP3512E Document number: DS38502 Rev. 4 - 3 5 of 14 www.diodes.com February 2020 © Diodes Incorporated

Electrical Characteristics (continued) ( VIN=VEN=12V, VOUT=3.3V, TA=+25°C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit THERMAL SHUTDOWN TOTSD Thermal Shutdown (Note 5) — — +160 — °C THYS Thermal Shutdown Hysteresis (Note 5) — — +30 — °C SOFT START (SS PIN) tSS Soft-Start Time (Note 5) CSS=0.1μF — 15 — ms — Soft-Start Current — — 5 — μA Notes: 5. Not tested, guaranteed by design. 6. RDS(ON)= SW2SW1 SW2SW1 I-I V-V AP3512E Document number: DS38502 Rev. 4 - 3 6 of 14 www.diodes.com February 2020 © Diodes Incorporated

Performance Characteristics (VIN=12V, VOUT=3.3V, L=4.7µH, TA=+25°C, unless otherwise noted.) Efficiency vs. Load Current Quiescent Current vs. Temperature Feedback Voltage vs. Temperature Output Ripple (IOUT=2A) Load Transient Response (IOUT=1A to 2A) Load Transient Response (IOUT=0.2A to 2A) 0.01 0.1 1 100 VIN=12V VOUT=3.3V, L=4.7µH VOUT=5.0V, L=6.8µH Efficiency (%) Load Current (A) -50 -25 0 25 50 75 100 125 150 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 Quiescent Current (mA) 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) Temperature ( o VSW (10V/div) VOUT-AC (20mV/div) IL (1A/div) Time (1µs/div) VOUT-AC (100mV/div) IOUT (1A/div) Time (100µs/div) VOUT-AC (100mV/div) IOUT (1A/div) Time (100µs/div) AP3512E Document number: DS38502 Rev. 4 - 3 7 of 14 www.diodes.com February 2020 © Diodes Incorporated

Performance Characteristics (continued) (VIN=12V, VOUT=3.3V, L=4.7µH, TA=+25°C, unless otherwise noted.) Power On from VIN (IOUT=2A) Power Off from VIN (IOUT=2A) Power On from EN (IOUT=2A) Power Off from EN (IOUT=2A) Short Circuit Protection (IOUT=2A) Short Circuit Protection Recovery (IOUT=2A) VIN (10V/div) VOUT (2V/div) IL (1A/div) Time (3.20ms/div) VIN (10V/div) VOUT (2V/div) IL (1A/div) Time (3.20ms/div) VEN (2V/div) VOUT (2V/div) IL (1A/div) Time (3.20ms/div) VEN (2V/div) VOUT (2V/div) IL (1A/div) Time (3.20ms/div) VSS (1V/div) VOUT (2V/div) VSW (10V/div) IL (2A/div) Time (64ms/div) VSS (1V/div) VOUT (2V/div) VSW (10V/div) IL (2A/div) Time (64ms/div) AP3512E Document number: DS38502 Rev. 4 - 3 8 of 14 www.diodes.com February 2020 © Diodes Incorporated

Ordering Information

PackingPackageProduct Name TR : Tape & ReelM : SO-8 G1 : Green MP : SO-8EP RoHS/Green Package (Note 8) Temperature Range Part Number Packing Status (Note 7) SO-8 -40 to +85°C AP3512EMTR-G1 4000/Tape & Reel In production SO-8EP -40 to +85°C AP3512EMPTR-G1 4000/Tape & Reel In production Notes: 7. All Tube versions are End of Life with replacement in Tape & Reel versions. 8. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes-packaging/. Marking Information (1) SO-8 (2) SO-8EP First and Second Lines: Logo and Marking ID Third Line: Date Code Y: Year WW: Work Week of Molding A: Assembly Site Code XX: 7th and 8th Digits of Batch Number 3512EM -G1 YWWAXX (Top View) First and Second Lines: Logo and Marking ID Third Line: Date Code Y: Year WW: Work Week of Molding A: Assembly Site Code XX: 7 th and 8th Digits of Batch Number 3512E MP-G1 YWWAXX (Top View) AP3512E Document number: DS38502 Rev. 4 - 3 9 of 14 www.diodes.com February 2020 © Diodes Incorporated

Package Outline Dimensions (All dimensions in mm(inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SO-8 0 ° 8 ° 1 ° 7 ° R0.150(0.006) R0.150(0.006) 1.000(0.039) 0.300(0.012) 0.510(0.020) 1.350(0.053) 1.750(0.069) 0.100(0.004) 0.300(0.012) 3.800(0.150) 4.000(0.157) 7 ° 20:1 D 1.270(0.050) TYP 0.150(0.006) 0.250(0.010) 8 ° D 5.800(0.228) 6.200(0.244) 0.600(0.024) 0.725(0.029) 0.320(0.013) 8 ° 0.450(0.017) 0.820(0.032) 4.700(0.185) 5.100(0.201) Note: Eject hole, oriented hole and mold mark is optional. Option 1 Option 1 Option 2 0.350(0.014) TYP TYP TYP 9°~ 9°~ AP3512E Document number: DS38502 Rev. 4 - 3 10 of 14 www.diodes.com February 2020 © Diodes Incorporated

Package Outline Dimensions (continued. All dimensions in mm (inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. (2) Package Type: SO-8EP 5.800(0.228) 6.200(0.244) 1.270(0.050) 0.400(0.016) 3.800(0.150) 4.000(0.157) 0.150(0.006) TYP 0.250(0.010) 0.150(0.006) 1.350(0.053) 1.550(0.061) 2.110(0.083) 2.710(0.107) 2.750(0.108) 3.402(0.134) 5.100(0.201) Note: Eject hole, oriented hole and mold mark is optional. 0.300(0.012) AP3512E Document number: DS38502 Rev. 4 - 3 11 of 14 www.diodes.com February 2020 © Diodes Incorporated

Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SO-8 Grid placement courtyard ZG Y E X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch) AP3512E Document number: DS38502 Rev. 4 - 3 12 of 14 www.diodes.com February 2020 © Diodes Incorporated

Suggested Pad Layout (continued) Please see http://www.diodes.com/package-outlines.html for the latest version. (2) Package Type: SO-8EP G E X Y Y1 Z Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) (mm)/(inch) (mm)/(inch) E (mm)/(inch) AP3512E Document number: DS38502 Rev. 4 - 3 13 of 14 www.diodes.com February 2020 © Diodes Incorporated

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