AP3428_V01 DIODES | Alldatasheet
Document overview
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Technical content
Features
Output Current: Up to 1A Output Voltage: 0.6V to VIN Input Voltage: 2.5V to 5.5V 0.6V Reference Voltage with ± 2% Precision 40µA (typ) No Load Quiescent Current Shutdown Current: <1µA 100% Duty Cycle Operation 1.5MHz Switching Frequency Internal Soft Start No External Compensation Required Current Limit Protection Thermal Shutdown TSOT25, TSOT25 (Type SM), U-DFN2020-6 (Type J) Packages Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Pin Assignments (Top View) TSOT25/TSOT25 (Type SM) for AP3428 (Top View) TSOT25/TSOT25 (Type SM) for AP3428A (Top View) U-DFN2020-6 (Type J)
Applications
Post DC-DC Voltage Regulation Set Top Boxes Notebook Computer PAD 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 contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
Document number: DS37417 Rev. 5 - 2 2 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Typical Applications Circuit VIN EN LX FB L1 2.2mHCIN 10mF VIN=2.5V to 5.5V GND COUT 10mF VOUT=1.8V ON OFF AP3428/A C1 22pF 300k 150k Pin Descriptions Pin Number Pin Name Function TSOT25/ TSOT25 (Type SM) for AP3428 TSOT25/ TSOT25 (Type SM) for AP3428A U-DFN2020-6 (Type J) 1 3 2 EN Enable control input. Force this p in voltage above 1.5V enables the chip, and below 0.4V shuts down the device. 2 2 5 GND Ground pin 3 5 4 LX The drains of the internal main and synchronous power MOSFET. 4 1 3 VIN Bias supply. Chip main power supply pin 5 4 6 FB Feedback voltage to int ernal error amplifier, the threshold voltage is 0.6V. — — 1 NC NC
Document number: DS37417 Rev. 5 - 2 3 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Functional Block Diagram LX GND 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 1(3){2} 5(4){6} 2(2){5} 3(5){4} 4(1){3} (A): TSOT25/TSOT25 (Type SM) for AP3428 (B): TSOT25/TSOT25 (Type SM) for AP3428A (C): U-DFN2020-6 (Type J)
Document number: DS37417 Rev. 5 - 2 4 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A 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 -3V to 7V (<40ns) V VFB Feedback Pin Voltage -0.3 to VIN+0.3 V PD Power Dissipation (on PCB, TA = +25° C) TSOT25 TSOT25 (Type SM) 0.4 W U-DFN2020-6 (Type J) 1.89 θJA Thermal Resistance (Junction to Ambient) TSOT25 TSOT25 (Type SM) 220 ° C/W U-DFN2020-6 (Type J) 53 θJC Thermal Resistance (Junction to Case, Simulation) TSOT25 TSOT25 (Type SM) 130 º C/W U-DFN2020-6 (Type J) 25 TJ Operating Junction Temperature +155 °C TSTG Storage Temperature -55 to +150 °C VMM ESD (Machine Model) 200 V VHBM ESD (Human Body Model) 2000 V VCDM ESD (Charge Device Mode) 1000 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 condition s beyond those indicated under Recommended Operating Condition s is not implied. Exposure to Absolute Maximum Ratings for extended periods can affect device reliability. Recommended Operating Conditions Symbol Parameter Min Max Unit VIN Supply Voltage 2.5 5.5 V TJ Junction Temperature Range -40 +125 °C TA Operating Ambient Temperature -40 +85 °C
Document number: DS37417 Rev. 5 - 2 5 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Electrical Characteristics (@TA = +25ºC, VIN = 5.0V, VOUT = 2.5V, COUT = 10µF, L = 2.2µH, unless otherwise specified.) Symbol Parameter Condition Min Typ Max Unit VIN Input Voltage Range — 2.5 — 5.5 V VOUT Output Voltage Range — 0.6 — VIN V IQ Quiescent Current VFB = 0.65V — 40 — µA ISD Shutdown Current VEN = 0V — 0.1 1 µA VFB Regulated Feedback Voltage — 0.588 0.6 0.612 V IFB FB Leakage Current VFB = 1V — — 0.2 µA ILIM Peak Inductor Current — 1.3 — — A fOSC Oscillator Frequency — — 1.5 — MHz RDS(ON) Drain-Source On-State Resistance ISW = 100mA High Side — 250 — mΩ ISW = 100mA Low Side — 170 — mΩ RDISCH Output Discharge Switch On Resister — — 2.1 — kΩ VENH EN Threshold High — 1.5 — — V VENL EN Threshold Low — — — 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 — — 0.1 — V TOTP Over Temperature Protection — — +160 — °C TOTH OTP Hysteresis — — +15 — °C tSS Soft-Start Time — — 2 — ms
Document number: DS37417 Rev. 5 - 2 6 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Performance Characteristics (@TA = +25° C, VIN = 5V, 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 Quiescent Current vs. Temperature Oscillation Frequency vs. Temperature 10 100 1000 100 Efficiency (%) Output Current (mA) VIN=5V, VOUT=1.0V VIN=5V, VOUT=1.8V VIN=5V, VOUT=3.3V -60 -40 -20 0 20 40 60 80 100 120 140 0.570 0.575 0.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 0.625 0.630 Feedback Reference Voltage (V) Temperature ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 120 140 160 180 200 220 240 260 PFET RDS(ON) (m) Temperature ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 120 140 160 180 200 220 240 NFET RDS(ON) (m) Temperatrue ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 Quiescent Current (mA) Temperatrue ( o -60 -40 -20 0 20 40 60 80 100 120 140 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Oscillation Frequency (MHz) Temperature ( o
Document number: DS37417 Rev. 5 - 2 7 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Performance Characteristics (@TA = +25° C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.) (continued) Enable Turn On Characteristic (IOUT = 1A) Enable Turn Off Characteristic (IOUT = 1A) Short Current Protection (IOUT = 1A) SCP Recovery (IOUT = 1A) Load Transient (IOUT=0.1A to 1A) Load Transient (IOUT=0.5A to 1A) VEN (5V/div) VOUT (1V/div) IL (1A/div) VSW (5V/div) VEN (5V/div) VOUT (1V/div) IL (1A/div) VSW (5V/div) VOUT (1V/div) IL (1A/div) VSW (5V/div) VOUT (1V/div) IL (1A/div) VSW (5V/div) VOUT_AC (100mV/div) IO (1A/div) VOUT_AC (100mV/div) IO (1A/div) Time (2ms/div) Time (2ms/div) Time (2ms/div) Time (2ms/div) Time (2ms/div) Time (2ms/div)
Document number: DS37417 Rev. 5 - 2 8 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A
Application Information
Typical application circuit is shown in the Typical A pplications 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 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 AP3428/A output node is shorted to GND that VFB drops under 0.42V, AP3428/A will enter hiccup mode to protect itself. If short circuit is removed, and VFB rises over 0.42V, the AP3428/A recovers to normal operation again. If the AP3428/A reaches OCP threshold while short circuit, the AP3428/A will enter cycle by cycle current limit mode until the current under OCP threshold. Over Temperature Protection The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the max imum junction temperature is exceeded. When the junction temperature exceeds +160°C, it shuts down the internal control circuit and switching power MOSFET. The AP3428/A will restart automatically under the control of soft start circuit when the junction temperature decreases to +145°C. Setting the Output Voltage The output voltage can be adjusted from 1 to 5V using an external resistor divider. Table 1 shows a list of resistor selectio ns for common output voltages. Resistor R1 is selected based on a design tradeoff between efficiency and output voltage accuracy. For high values of R1 there is less current consumption in the feedback network. However the tradeoff is output voltage accuracy due to the bias current in the error amplifier. R1 can be determined by the following equation. Meanwhile, the input capacitor should close to IC for preventing unexpected influences. Figure 1. Feedback Divider Network Table 1. Resistor Selection for Common Output
Document number: DS37417 Rev. 5 - 2 9 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A
Ordering Information
KT : TSOT25 AP3428X X X - X PackingPackage TR : Tape & Reel Product Name G1 : RoHS Compliant and Green RoHS/Green DN : U-DFN2020-6 Product Version A : AP3428A Blank : AP3428 (Type J) WT : TSOT25(Type SM) 7 : Tape & Reel Part Number Status Package Identification Code Temperature Range Packing AP3428AKTTR-G1 NRND TSOT25 L2J -40 to +85°C 3000/Tape & Reel AP3428KTTR-G1 NRND TSOT25 L2H -40 to +85°C 3000/Tape & Reel AP3428DNTR-G1 Active U-DFN2020-6(Type J) CQ -40 to +85°C 3000/Tape & Reel AP3428AWT-7 Active TSOT25 (Type SM) BD -40 to +85°C 3000/Tape & Reel AP3428WT-7 Active TSOT25 (Type SM) BC -40 to +85°C 3000/Tape & Reel Note 5: NRND = Not Recommended for New Design. Marking Information TSOT25 (Type SM) for AP3428WT-7 and AP3428AWT-7 1 2 3 XX : Identification Code W : Week : A to Z : 1 to 26 week; X : Internal Code (Top View) Y : Year 0 to 9 a to z : 27 to 52 week; z represents 52 and 53 week XX Y W X Part Number Package Identification Code AP3428WT-7 TSOT25 (Type SM) BC AP3428AWT-7 TSOT25 (Type SM) BD
Document number: DS37417 Rev. 5 - 2 10 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Marking Information (continued) (1) TSOT25 for AP3428 (Top View) (2) TSOT25 for AP3428A (Top View) (3) U-DFN2020-6 (Type J) (Top View) First Line: Logo and Marking ID First Line: Logo and Marking ID First Line: Logo and Marking ID
Document number: DS37417 Rev. 5 - 2 11 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: TSOT25 (Type SM) P IN #1 D e E1 E A2A L a b c S e a ting P la ne TSOT25 (Type SM) Dim Min Max Typ A 0.70 0.90 -- A1 0.00 0.10 -- A2 0.70 0.80 0.75 b 0.35 0.50 -- c 0.08 0.20 -- D 2.82 3.02 2.92 E 2.65 2.95 2.80 E1 1.60 1.70 1.65 e 0.95 BSC e1 1.90 BSC L 0.30 0.60 0.40 L1 0.59 REF L2 0.25 BSC a 0° 8° -- All Dimensions in mm
Document number: DS37417 Rev. 5 - 2 12 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Package Outline Dimensions (continued) Please see http://www.diodes.com/package-outlines.html for the latest version. (2) Package Type: TSOT25 D E1/2 E E/2 e A Seating Plane0 L Gauge Plane 01( 4x) 01( 4x) c b Seating Plane (3) Package Type: U-DFN2020-6 (Type J) D E e b L A A1 D2/2 E2/2 R0.100 Seating Plane TSOT25 Dim Min Max Typ A - 1.00 - A1 0.01 0.10 - A2 0.84 0.90 - b 0.30 0.45 - c 0.12 0.20 - D - - 2.90 E - - 2.80 E1 - - 1.60 e 0.95 BSC e1 1.90 BSC L 0.30 0.50 - L2 0.25 BSC θ 0° 8° 4° θ1 4° 12° - All Dimensions in mm U-DFN2020-6 (Type J) Dim Min Max Typ A 0.50 0.60 -- A1 0.00 0.05 0.03 A3 -- -- 0.203 b 0.20 0.30 0.25 D 1.95 2.075 2.00 D2 1.45 1.65 1.55 E 1.95 2.075 2.00 E2 0.76 0.96 0.86 e 0.65 BSC L 0.30 0.40 0.35 All Dimensions in mm
Document number: DS37417 Rev. 5 - 2 13 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: TSOT25 (Type SM) C Y X (2) Package Type: TSOT25 C X Y (3) Package Type: U-DFN2020-6 (Type J) Y2 Y1 C X Y G Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 Dimensions Value (in mm) C 0.650 G 0.120 X 0.350 X1 1.650 Y 0.550 Y1 0.960 Y2 2.300
Document number: DS37417 Rev. 5 - 2 14 of 14 www.diodes.com May 2021 © Diodes Incorporated AP3428/A Mechanical Data TSOT25/TSOT25 (Type SM) Moisture Sensitivity: Level 3 per J-STD-020 Terminals: Finish - Mate Tin Plated Leads, Solderable per MIL-STD-202, Method 208 Weight: 0.014 grams (Approximate) U-DFN2020-6 (Type J) Moisture Sensitivity: Level 1 per J-STD-020 Terminals: Finish - NiPdAu over Copper Leads, Solderable per MIL-STD-202, Method 208 Weight: 0.007 grams (Approximate) 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 MERCHANTA BILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. 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