AP3405

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 9

Technical content

Features

  • High-Efficiency Buck Power Converter
  • Input Voltage Range: 2.3V to 5.5V
  • Output Voltage Range: 0.7V to 5.5V
  • Fixed 2.0MHz Oscillator Frequency
  • Built-in Soft-Start Time
  • Built-in Overcurrent Protection
  • Built-in Thermal Shutdown Function
  • Built-in UVLO Function
  • Hiccup Mode SCP
  • Output Current: 600mA
  • Package: U-DFN2020-8 (Type E)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3) Pin Assignments (Top View) Pin 1 Mark EP NC NC PGND EN FB SW 3 6AGND VIN U-DFN2020-8 (Type E)

Applications

  • Post DC-DC Voltage Regulation
  • Mobile Phones and Wearable Devices Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Hal ogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit L 2.2μH VIN CIN 4.7μF ON/OFF VIN EN SW FB AGND PGND VOUT 1.8V COUT 10μF 240KΩ 120KΩ Cff 22pF AP3405 8 3 PART OBSOLETE – CONTACT US

Document number: DS38093 Rev. 2 - 4 2 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED Pin Descriptions Pin Number Pin Name Function 1 , 2 NC No connection

3 AGND Signal Ground Pin

4 PGND Power Ground Pin

5 SW Power switch output pin. This pin is connected to the inductor. 6 VIN Supply power input pin. A capacitor should be connected between VIN pin and GND - to keep the input voltage constant. 7 FB Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. 8 EN Control input pin. EN is a digital input that turns the regulator on or off. Drive EN high to turn the regulator on. Drive low to turn the regulator off. Functional Block Diagram 5 SW PGND Error Amplifier FB EN PWM Comparator Buffer & Dead Time Control Logic Control Logic Current Sensing Reverse Inductor Current Comparator Vin OVP Comparator OscillatorSlope Compensation OCP Comparator Soft Start Bias Generator Shutdown Comparator Bandgap Reference UVLO VIN AGND

Document number: DS38093 Rev. 2 - 4 3 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4) Symbol Parameter Rating Unit VIN VIN Input Voltage -0.3 to 6.5 V VSW SW Pin Voltage -0.3 to VIN + 0.3 V VEN EN Pin Input Voltage -0.3 to 6.5 V VFB VFB Pin Voltage -0.3 to 6.5 V ISW SW Pin Output Current 1 A PD Power Dissipation (Standard Land Pattern) 640 mW TSTG Storage Temperature Range -55 to +125 °C VHBM ESD (Human Body Model) 2,000 V Note: 4. 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 Operati ng Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability . Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol Parameter Min Max Unit VIN Input Voltage 2.3 5.5 V TA Operating Ambient Temperature -40 +85 °C

Document number: DS38093 Rev. 2 - 4 4 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED Electrical Characteristics (VIN = VEN = 3.6V (V OUT ≤ 2.6V), VIN = VEN = VOUT+1V (VOUT > 2.6V), unless otherwise specified. Specification with standard typeface are for TA = +25°C, and those in boldface type apply over the full operating temperature range (TA = -40°C to +85°C)) Symbol Parameter Conditions Min Typ Max Unit VIN Input Voltage 1.0V ≤ VOUT 2.3 – 5.5 V 0.9V ≤ VOUT < 1.0V 2.3 – 5.25 0.7V ≤ VOUT < 0.9V 2.3 – 4.5 IDD Supply Current VIN = VEN = VFB = 3.6V – 32 45 µA ISTDB Standby Current VIN = 5.5V, VEN = 0V – 0 5 µA VUVLO Input UVLO Threshold VIN Rising 2.0 2.1 2.2 V VHYS Input UVLO Hysteresis – – 0.1 – V VENH EN Active Threshold Voltage VIN = 5.5V 1.0 – – V VENL EN Shutdown Threshold Voltage VIN = 2.3V – – 0.4 V VFB Feedback Voltage VIN = VEN = 3.6V 0.591 0.600 0.609 V IFBH FB High Input Current VIN = VFB = 5.5V VEN = 0V -1 0 1 µA IFBL FB Low Input Current VEN = VFB = 0V VIN = 5.5V -1 0 1 µA RONH High-Side Switch On-Resistance VIN = 3.6V ISW = 100mA – 380 – mΩ RONL Low-Side Switch On-Resistance VIN = 3.6V ISW = 100mA – 300 – mΩ ILIMH SW Current Limit VIN = VEN = 3.6V 800 1,000 – mA fOSC Oscillator Frequency – 1.7 2.0 2.3 MHz DMAX Maximum Duty Cycle – 100 – – % TOTSD Thermal Shutdown – – +140 – °C THYS Thermal Shutdown Hysteresis – – +40 – °C tSS Soft-Start Time VIN = VEN = 3.6V – 150 300 µs

Document number: DS38093 Rev. 2 - 4 5 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED Performance Characteristics (TA = +25°C, VIN = 3.6V, VOUT = 1.8V, unless otherwise specified.) Efficiency vs. Output Current Output Voltage vs. Output Current Supply Current vs. Input Voltage Feedback Voltage vs. Temperature PMOS R DSON vs. Temperature NMOS RDSON vs. Temperature -50 0 50 100 150 200 250 300 350 400 450 500 550 600 650 100 Efficiency (%) Output Current (mA) VOUT = 1.8V 0 100 200 300 400 500 600 1.775 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 Output Voltage (V) Output Current (mA) VIN = 3.6V -40 -20 0 20 40 60 80 100 120 140 0.50 0.52 0.54 0.56 0.58 0.60 0.62 0.64 0.66 0.68 Feedback Voltage (V) Temperature ( o VIN = 3.6V, Test Mode Supply Current (µA) Input Voltage (V) VOUT = 1.8V, IOUT = 0A -60 -40 -20 0 20 40 60 80 100 120 140 240 260 280 300 320 340 360 380 400 420 440 PMOS RDSON (mΩ) Temperature ( O ISW = 100mA -60 -40 -20 0 20 40 60 80 100 120 140 180 200 220 240 260 280 300 320 340 360 NMOS RDSON (mΩ) Temperature ( O ISW = 100mA

Document number: DS38093 Rev. 2 - 4 6 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED Performance Characteristics (continued) (TA = +25°C, VIN = 3.6V, VOUT = 1.8V, unless otherwise specified.) Output Ripple (IOUT = 0A) Output Ripple (IOUT = 0.6A) Enable Turn on Characteristic Enable Turn off Characteristic (Resistance Load, R LOAD = 3Ω) (Resistance Load, RLOAD = 3Ω) Short Current Protection SCP Recovery (Resistance Load, R LOAD =3Ω) (Resistance Load, RLOAD = 3Ω) VSW 5V/div VOUT-AC 20mV/div IL 500mA/div VSW 2V/div VOUT-AC 20mV/div IL 500mA/div VEN 2V/div VOUT 2V/div VSW 1V/div VEN 2V/div VOUT 2V/div VSW 1V/div VOUT 1V/div IL 500mA/div VSW 2V/div VOUT 1V/div IL 500mA/div VSW 2V/div Time 1.6ms/div Time 1µs/div Time 50µs/div Time 50µs/div Time 200µs/div Time 200µs/div

Document number: DS38093 Rev. 2 - 4 7 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED

Application Information

Please refer to the Typical Applications Circuit, and to set the circuit parameters please refer to the following descriptions. Undervoltage Lockout (UVLO) Circuit When the V IN drops lower than the UVLO detector threshold, the UVLO circuit starts to operate, V REF stops, and high- side switch and low -side switch built-in switch transistors turn “OFF”. As a result, V OUT drops according to the COUT capacitance value and the load. When the V IN is rising higher than UVLO released voltage, the IC will restart the operation. Short Circuit Protection and Recovery When the AP3405 output node is shorted to GND, as V FB drops under 0.3V, the chip will enter hiccup mode to protect itself, when short circuit is removed, and VFB rises over 0.4V, the AP3405 recovers to normal operation again. If the AP3405 reaches OCP threshold while short circuit, the AP3405 will enter cycle-by-cycle current limit mode until the current under OCP threshold. Input Overvoltage Protection When input voltage of AP3405 is near 6.25V, the IC will enter Input -Overvoltage-Protection. It would be shut down and there will be no output voltage in this state. As the input voltage goes down below 6V, it will leave input OVP and recover the output voltage. Over-Temperature Protection The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the max imum junc tion temperature is exceeded. When the junction temperature exceeds +140°C, it shuts down the internal control circuit and switching power MOSFET. The AP3405 will restart automatically under the control of soft start circuit when the junction temperature decreases to +100°C.

Ordering Information

7 : Tape & ReelU-DFN2020-8 Device Package Code Packaging 7” Tape and Reel Quantity Part Number Suffix AP3405SHE-7 SHE U-DFN2020-8 3,000/Tape & Reel -7 Marking Information U-DFN2020-8 (Type E) ( Top View ) XX Y : Year : 0~9 X : Internal Code XX : Identification Code W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week Y W X Part Number Package Identification Code AP3405SHE U-DFN2020-8 2V

Document number: DS38093 Rev. 2 - 4 8 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  OBSOLETE – PART DISCONTINUED Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) Package Type: U-DFN2020-8 (Type E) A A1 A3 Seating Plane D E e b L E2/2 Pin #1 ID z D2/2 R0.200 R0.120 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: U-DFN2020-8 (Type E) X Y C G G U-DFN2020-8 (Type E) Dim Min Max Typ A 0.50 0.60 0.56 A1 0.00 0.05 0.02 A3 - - 0.203 b 0.20 0.30 0.25 D 1.950 2.075 2.00 D2 1.60 1.80 1.70 e 0.500 BSC E 1.950 2.075 2.00 E2 0.80 1.00 0.90 L 0.25 0.35 0.30 z - - 0.125 All Dimensions in mm Dimensions Value (in mm) C 0.500 G 0.150 X 0.350 X1 1.800 X2 1.850 Y 0.500 Y1 1.000 Y2 2.300

Document number: DS38093 Rev. 2 - 4 9 of 9 www.diodes.com July 2021 © Diodes Incorporated AP3405  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 PARTICULAR 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 operation 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 engineering customers and users who design with Diodes products. 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