AP3402

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 10

Technical content

Features

  • Output Current: Up to 2A
  • Output Voltage: 0.6V to VIN
  • Input Voltage: 2.7V to 5.5V
  • Peak Efficiency Up to 95%
  • 90μA (Typ) No Load Quiescent Current
  • Shutdown Current: <1μA
  • 100% Duty Cycle Operation
  • 1MHz Switching Frequency
  • Power Good Indicator Function
  • Internal Soft Start
  • No External Compensation Required
  • Current Limit Protection
  • Thermal Shutdown
  • TSOT26 Package
  • Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3) Pin Assignments (Top View) TSOT26

Applications

  • 5V or 3.3V Point of Load Conversion
  • Telecom/Networking Equipment
  • Set Top Boxes
  • Storage Equipment
  • Video Cards
  • DDR Power Supply 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 definiti ons 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. EN LX VIN FB GND PG 3 4 Pin 1 Mark NOT RECOMMENDED FOR NEW DESIGN - NO ALTERNATE PART

Document number: DS36623 Rev. 5 - 3 2 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 Typical Applications Circuit VIN EN LX FB L1 2.2µH CIN VIN=2.7V to 5.5V GND COUT 22µFx2 VOUT=1.8V ON OFF AP3402 22pF 300k 150k PG 22µF 100k Pin Descriptions Pin Number Pin Name Function 1 EN Enable control input. Force this pin voltage above 1.5V enables the chip, and below 0.4V shuts down the device

2 GND Ground pin

3 LX The drains of the internal main and synchronous power MOSFET

4 VIN Bias supply. Chip main power supply pin 5 PG Power good indicator , open drain output. PG is pulled up to VIN when the output voltage is within 20% of the regulation level, otherwise it is low 6 FB Feedback voltage to internal error amplifier, the threshold voltage is 0.6V

Document number: DS36623 Rev. 5 - 3 3 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 Functional Block Diagram

1 M OSC SLOPE COMP

S R Q QEA SWITCHING LOGIC AND BLOCKING CIRCUIT ANTI - SHOOT THRU PWM COMP IAMPFB EN VIN LX GNDSHUTDOWN ____ OSC V REF0.6 CONTROL LOGIC PG Absolute Maximum Ratings (Note 4) Symbol Parameter Rating Unit VIN Input Voltage -0.3 to 6 V VEN EN Pin Voltage -0.3 to VIN +0.3 V VLX LX Pin Voltage -0.3 to VIN +0.3 V VLX LX Pin Voltage -3 to VIN +3 for <20nS V VFB Feedback Pin Voltage -0.3 to VIN +0.3 V VPG PG Pin Voltage -0.3 to VIN +0.3 V θJA Thermal Resistance (Junction to Ambient) TSOT26 220 °C/W TJ Operating Junction Temperature +150 °C TSTG Storage Temperature -65 to +150 °C TLEAD Lead Temperature (Soldering, 5 sec) +300 °C VMM ESD (Machine Model) 200 V VHBM ESD (Human Body Model) 2000 V Note : 4.Stresses greater than those listed und er “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 Operating C onditions” 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 Range 2.7 5.5 V TA Operating Ambient Temperature -40 +85 °C TJ Junction Temperature Range -40 +125 °C

Document number: DS36623 Rev. 5 - 3 4 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 Electrical Characteristics (@VIN = 5V, VOUT = 1.8V, L = 2.2µH, COUT = 22µF×2, TA = +25°C, unless otherwise specified.) Symbol Parameters Conditions Min Typ Max Unit VIN Input Voltage Range — 2.7 — 5.5 V VOUT Output Voltage Range — 0.6 — VIN V VFB Regulated Feedback Voltage — 0.588 0.6 0.612 V IFB FB Leakage Current VFB = 1V — — 0.2 μA IQ Quiescent Current VFB = 0.65V — 90 — μA ISD Shutdown Current VEN = 0V — — 1 μA ILIM Peak Inductor Current — 3 — — A fOSC Oscillator Frequency — — 1 — MHz RDS(ON) Drain to Source On-state Resistance ILX = 100mA, high side — 110 — mΩ ILX = 100mA, low side — 80 — VENH EN High Threshold — 1.5 — — V VENL EN Low Threshold — — — 0.4 V IEN EN Leakage Current VIN = VEN = 5V -1.0 — 1.0 μA VUVLO Input UVLO Threshold — — 2.4 2.7 V VHYS UVLO Hysteresis — — 0.2 — V TOTP Over Temperature Protection — — +160 — °C TOTH OTP Hysteresis — — +30 — °C VFBTH Power Good Threshold (Relative to VFB) — — ±20 — % VIOVP VIN Over Voltage Protection — — 6.25 — V VIHSY IOVP Hysteresis — — 0.25 — V tSS Soft-start Time — — 1.8 — ms

Document number: DS36623 Rev. 5 - 3 5 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 Performance Characteristics (@TA = +25ºC, VIN = 5.0V, VOUT = 1.8V, unless otherwise specified.) Efficiency vs. Load Current Feedback Reference Voltage vs. Temperature PFET Drain-Source On-State Resistance vs. Temperature NFET Drain-Source On-State Resistance vs. Temperature Inductor Current Limit vs. Temperature Oscillation Frequency vs. Temperature 1 10 100 1000 100 Efficiency (%) IOUT (mA) VIN=5V,VOUT=1.0V VIN=5V,VOUT=1.8V VIN=5V,VOUT=3.3V -60 -40 -20 0 20 40 60 80 100 120 1400.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 Feedback Reference Voltage (V) Temperature ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 110 120 130 140 150 160 170 180 190 200 PFET RDS(ON)(mΩ) Temperture ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 110 120 NFET RDS(ON) (mΩ) Temperture ( o -60 -40 -20 0 20 40 60 80 100 120 140 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 Inductor Current Limit (A) Temperature ( o -60 -40 -20 0 20 40 60 80 100 120 140 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 Oscillation Frequency (MHz) Temperature ( o

Document number: DS36623 Rev. 5 - 3 6 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 Performance Characteristics (@TA = +25ºC, VIN = 5.0V, VOUT = 1.8V, unless otherwise specified.) Enable Turn on Characteristic (IOUT=2A) Enable Turn off Characteristic (IOUT=2A) Time (5ms/div) Time (200µs/div) Short Current Protection (IOUT=2A) SCP Recovery (IOUT=2A) Time (50ms/div) Time (50ms/div) Load Transient (IOUT=0.1A to 2A) Load Transient (IOUT=1A to 2A) Time (100µs/div) Time (100µs/div) VEN (2V/div) VOUT (1V/div) IL (2A/div) VPG (2V/div) VEN (2V/div) VOUT (1V/div) IL (2A/div) VPG (2V/div) VOUT (1V/div) IL (2A/div) VSW (5V/div) VOUT (1V/div) IL (2A/div) VSW (5V/div) VOUT_AC (100mV/div) IOUT (1A/div) VOUT_AC (100mV/div) IOUT (1A/div)

Document number: DS36623 Rev. 5 - 3 7 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402

Application Information

Typical application circuit is shown in the application circuit and for the circuit parameters setting please refers to the following descriptions. Under Voltage Lockout (UVLO) Circuit When the V IN drops lower than the UVLO detec tor 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 AP3402 output node is shorted to GND that VFB drops under 0.3V, the AP3402 will enter hiccup mode to protect itself. If short circuit is removed, and VFB rises over 0.3V, the AP3402 recovers to normal operation again. If the AP3402 reaches OCP threshold while short circuit, the AP3402 will enter cycle by cycle current limit mode until the current under OCP threshold. Power Good The PG pin output is an open drain MOSFET. The output is pulled low when the FB voltage enters the fault condition by falling below 80% or rising above 120% of the nominal internal reference voltage. When the FB voltage rises to the good condition above 90% or falls below 110% o f the internal voltage reference PG output MOSET is turned off. It is recommended using a pull-up to VIN. Over Temperature Protection The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When the junction temperature exceeds +160oC, it shuts down the internal control circuit and switching power MOSFET. The AP3402 will restart automatically under the control of soft start circuit when the junction temperature decreases to +130oC. Input Over Voltage Protection When input voltage of the AP3402 is near 6.25V, the IC will enter Input-Over-Voltage-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.

Document number: DS36623 Rev. 5 - 3 8 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402

Ordering Information

AP3402 XX XX – XX PackingPackageProduct Name TR : Tape & ReelKT : TSOT26 G1 : Green RoHS/Green Package Temperature Range Part Number Marking ID Packing Status TSOT26 -40°C to +85°C AP3402KTTR-G1 GND 3000 / Tape & Reel NRND Marking Information (1) TSOT26 (Top View) First Line: Logo and Marking ID 1 2 3 456 GND

Document number: DS36623 Rev. 5 - 3 9 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 Package Outline Dimensions (1) Package Type: TSOT26 D E1/2 E E/2 e A Seating Plane0 L Gauge Plane 01( 4x) 01( 4x) c b Seating Plane TSOT26 Dim Min Max Typ A − 1.00 − A1 0.010 0.100 − A2 0.840 0.900 − D 2.800 3.000 2.900 E 2.800 BSC E1 1.500 1.700 1.600 b 0.300 0.450 − c 0.120 0.200 − e 0.950 BSC e1 1.900 BSC L 0.30 0.50 L2 0.250 BSC θ 0° 8° 4° θ1 4° 12° − All Dimensions in mm Suggested Pad Layout (1) Package Type: TSOT26 C X Y Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199

Document number: DS36623 Rev. 5 - 3 10 of 10 www.diodes.com January 2021 © Diodes Incorporated AP3402 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 LIM ITED 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 i nformational 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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