AP2821

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 11

Technical content

Features

  • Low MOSFET On-Resistance: 120mΩ@VIN = 5.0V
  • Compliant to USB Specifications
  • Operating Voltage Range: 2.7V to 5.5V
  • Low Supply Current: 35µA (typ)
  • Low Shutdown Current: < 1µA
  • Current Limit with Foldback: 2A
  • Undervoltage Lockout
  • Soft Startup
  • Overcurrent Protection
  • Overtemperature Protection
  • Load Short Protection with Foldback
  • No Reverse Current when Power Off
  • Pass System ESD: IEC61000-4-2 ±16kV (Air Discharge) and ±8kV (Contact Discharge) on USB Connector
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, 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) 3 4 5VOUT EN GND VIN VIN SOT-23-5

Applications

  • USB power management
  • USB bus/self-powered hubs
  • Hot-plug power supplies
  • Battery-charger circuits
  • Notebooks, motherboard PCs Typical Applications Circuit VIN VOUT GND AP2821 EN VIN=5V Enable VBUS GND CIN (Note 1) 4.7mF COUT 4.7mF Note: 1. 4.7µF input capacitor is enough in most application cases. If the PCB trace of power rail to VIN is long, larger input capacitor is necessary. THE AP2821 IS OBSOLETE. PLEASE CONTACT US.

Document number: DS41407 Rev. 4 - 4 2 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Pin Descriptions Pin Number Pin Name Descriptions

1 VOUT Switch Output Voltage

2 GND Ground

3 EN Chip Enable Control Input, Active High

4, 5 VIN Supply Input Pin Functional Block Diagram Clock Band Gap Reference UVLO Gate Control Over Current Limiting Thermal Sense Current SenseCMP VIN VOUT GND EN 4, 5 Shutdown Signal

Document number: DS41407 Rev. 4 - 4 3 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Absolute Maximum Ratings (Note 2) Symbol Parameter Rating Unit VIN Power Supply Voltage 6.0 V TJ Operating Junction Temperature Range +150 °C TSTG Storage Temperature Range -65 to +150 °C TLEAD Lead Temperature (Soldering, 10 Seconds) +260 °C θJA Thermal Resistance (Junction to Ambient) 235 °C/W — ESD (Machine Model) 200 V — ESD (Human Body Model) 2000 V Note: 2. Stresses greater than those listed under Absolute Maximum Ratings can cause permanent damage t o 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 Supply Voltage 2.7 5.5 V TA Ambient Operation Temperature Range -40 +85 °C Electrical Characteristics (VIN = 5.0V, CIN = 4.7µF, COUT = 4.7µF, Typical TA = +25°C, unless otherwise specified.) Symbol Parameter Test Conditions Min Typ Max Unit VIN Input Voltage Range — 2.7 — 5.5 V RDS(ON) Switch On Resistance VIN = 5V, IOUT = 0.5A — 120 140 mΩ ILIMIT Current Limit VOUT = 4.0V 1.5 2.0 2.8 A ISUPPLY Supply Current VIN = 5V, RLOAD Open — 35 65 µA ISHORT Foldback Short Current VOUT = 0 — 1.5 — A ISHUTDOWN Shutdown Supply Current VEN = 0, Shutdown Mode — 0.1 1 µA ILEAKAGE Output Leakage Current VEN = 0, VOUT = 0 — 0.1 1 µA VENH Enable High Voltage Enable Logic High 2.0 — 6.0 V VENL Enable Low Voltage Enable Logic Low 0 — 1.2 V IEN Enable Pin Input Current Force 0V to 5.0V at EN Pin 0 — 1.0 µA VUVLO Undervoltage Lockout Threshold Voltage VIN Increasing from 0 2.2 2.5 2.7 V VUVLOHY Undervoltage Hysteresis — — 0.2 — V IREVERSE Reverse Current VEN = 0, VOUT > VIN — 0.1 1.0 µA RDISCHARGE Shutdown Pull Low Resistance VEN is disable — 100 250 Ω tON Output Turn-On Time From Enable Active to 90% of Output, RL = 10Ω — 1.9 — ms TOTSD Thermal Shutdown Temperature — — +145 — THYOTSD Thermal Shutdown Hysteresis — — +20 — JC Thermal Resistance (Junction to Case) — — 70 — °C/W

Document number: DS41407 Rev. 4 - 4 4 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Performance Characteristics Supply Current vs. Input Voltage Current Limit vs. Temperature Enable Input Threshold vs. Temperature Enable Input Threshold vs. Input Voltage UVLO Threshold Voltage vs. Temperature UVLO Function TA=-40 o C TA=25 o C TA=85 o C Input Voltage (V) Supply Current (mA) VEN=VIN -40 -20 0 20 40 60 80 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 Temperature ( o Current Limit (A) VIN=5V -40 -20 0 20 40 60 80 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1

2.4 VIN=5V

Temperature ( o Enable Input Threshold (V) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 VEN Rising VEN Falling Enable Input Threshold (V) TA=25 o C Input Voltage (V) -40 -20 0 20 40 60 80 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 Temperature ( o VIN Rising VIN Falling UVLO Threshold (V) 0 1 2 3 4 5 Input Voltage (V) No Load VIN Rising VIN Falling UVLO Output Voltage (V)

Document number: DS41407 Rev. 4 - 4 5 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Performance Characteristics (continued) Switch-On Resistance vs. Input Voltage Switch-On Resistance vs. Temperature Output Short to GND Current vs. Input Voltage Output Short to GND Current vs. Temperature Output Voltage vs. Output Current Switch Turn-On and Rise Time (VIN=3.3V, COUT=4.7µF, No Load) 100 150 200 250 300 350 400 TA=-40 o C TA=25 o C TA=85 o C Switch-on Resistance (m) Input Voltage (V) IOUT=1A -40 -20 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 VIN=3V VIN=4V VIN=5V Temperature ( o Switch-on Resistance (m) IOUT=1A 1.0 1.2 1.4 1.6 1.8 2.0 Output Short to GND Current (A) Input Voltage (V) TA=25 O C -40 -20 0 20 40 60 80 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Temperature ( O Output Short to GND Current (A) VIN=5V VEN=5V Output Current (A) Output Voltage (V) VIN=5V VEN=5V TA=25 O C VEN 5V/div VOUT 1V/div Time 1ms/div

Document number: DS41407 Rev. 4 - 4 6 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Performance Characteristics (continued) Switch Turn-On and Rise Time Switch Turn-On and Rise Time (VIN=5.0V, COUT=4.7µF, No Load) (VIN=3.3V, COUT=4.7µF, RL=10Ω) Switch Turn-On and Rise Time Switch Turn-On and Rise Time (VIN=5.0V, COUT=4.7µF, RL=10Ω) (VIN=3.3V, COUT=100µF, RL=10Ω) Switch Turn-On and Rise Time Switch Turn-Off and Fall Time (VIN=5.0V, COUT=100µF, RL=10Ω) (VIN=3.3V, COUT=4.7µF, No Load) VEN 5V/div VOUT 1V/div Time 1ms/div VEN 5V/div VOUT 1V/div IOUT 500mA /div Time 1ms/div VEN 5V/div VOUT 1V/div IOUT 500mA /div VEN 5V/div VOUT 1V/div IOUT 500mA /div Time 1ms/div Time 1ms/div VEN 5V/div VOUT 1V/div IOUT 500mA /div VEN 5V/div VOUT 1V/div Time 1ms/div Time 1ms/div

Document number: DS41407 Rev. 4 - 4 7 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Performance Characteristics (continued) Switch Turn-Off and Fall Time Switch Turn-Off and Fall Time (VIN=5.0V, COUT=4.7µF, No Load) (VIN=3.3V, COUT=100µF, No Load) Switch Turn-Off and Fall Time Switch Turn-Off and Fall Time (VIN=5.0V, COUT=100µF, No Load) (VIN=3.3V, COUT=100µF, RL=10) Switch Turn-Off and Fall Time Resistance Load Inrush Response (VIN=5.0V, COUT=100µF, RL=10) (COUT=4.7µF, RL=1.65) VOUT 1V/div VOUT 1V/div Time 1ms/div Time 10ms/div VEN 5V/div VEN 5V/div VOUT 2V/div IOUT 1A/div Time 100µs/div VOUT 1V/div Time 10ms/div VOUT 1V/div Time 500µs/div VOUT 1V/div Time 500µs/div VEN 5V/div VEN 5V/div IOUT 500mA /div VEN 5V/div IOUT 500mA /div

Document number: DS41407 Rev. 4 - 4 8 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Performance Characteristics (continued) Short-Circuit Current, Thermal Shutdown Response Device Enable into Short (VIN=5.0V, COUT=4.7µF, RL=1.65) (VIN=5.0V, COUT=4.7µF) Ordering Information (Note 3) AP2821 X X - X RoHS/GreenPackingProduct Name Package K : SOT-23-5 G1 : RoHS Compliant and Green TR : Tape & Reel Orderable Part Number Package Temperature Range Marking ID Packing AP2821KTR-G1 SOT-23-5 -40 to +85°C G4E Tape & Reel Note: 3. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes -packaging/. VEN 5V/div Time 100ms/div VOUT 2V/div IOUT 1A/div Time 200µs/div VEN 5V/div IOUT 1A/div

Document number: DS41407 Rev. 4 - 4 9 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Package Outline Dimensions (All dimensions in mm(inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SOT-23-5 2.820(0.111) 2.650(0.104) 1.500(0.059) 0.000(0.000) 0.300(0.012) 0.950(0.037) 0.900(0.035) 0.100(0.004) 0.200(0.008) 0.300(0.012) 3.100(0.122) 1.700(0.067) 3.000(0.118) 0.500(0.020) 0.150(0.006) 1.300(0.051) 0.200(0.008) 0.600(0.024) 1.800(0.071) 2.000(0.079) 0.700(0.028) REF TYP 1.450(0.057) M AX

Document number: DS41407 Rev. 4 - 4 10 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SOT-23-5 Y X G Z Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) (mm)/(inch) (mm)/(inch)

Document number: DS41407 Rev. 4 - 4 11 of 11 www.diodes.com June 2025 © 2025 Copyright Diodes Incorporated. All Rights Reserved. AP2821 OBSOLETE – PART DISCONTINUED IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES 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 d esign with Diodes’ products. Diodes’ products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of Diodes’ products for their intended applications, (c) ensuring their applications, which incorporate Diodes’ products, comply the applicable legal and regulatory requirements as well as safety and functional-safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality co ntrol techniques, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associ ated with their applications. 3. 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