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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
Document number: DS36623 Rev. 3 - 2 2 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT Typical Applications Circuit VIN EN LX FB L1 2.2mH CIN VIN=2.7V to 5.5V GND COUT 22mFx2 VOUT=1.8V ON OFF AP3402 C1 22pF 300k 150k PG 22mF 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. 3 - 2 3 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT 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 VFB Feedback Pin Voltage -0.3 to VIN +0.3 V VPG PG Pin Voltage -0.3 to VIN +0.3 V JA 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 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 Operating Condi tions” 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. 3 - 2 4 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT 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. 3 - 2 5 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT 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 80 100 120 140 0.580 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)(m) Temperture ( o -60 -40 -20 0 20 40 60 80 100 120 140 100 110 120 NFET RDS(ON) (m) 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. 3 - 2 6 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT 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. 3 - 2 7 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT
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 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 AP34 02 output node is shorted to GND that VFB drops under 0. 3V, 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 AP34 02 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% of 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 max imum junction temperature is exceeded. When the junction tem perature 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 AP340 2 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. 3 - 2 8 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT
Ordering Information
AP3402 XX XX – XX PackingPackageProduct Name TR : Tape & ReelKT : TSOT26 G1 : Green RoHS/Green Package Temperature Range Part Number Marking ID Packing TSOT26 -40° C to +85°C AP3402KTTR-G1 GND 3000 / Tape & Reel Marking Information (1) TSOT26 (Top View) First Line: Logo and Marking ID 1 2 3 456 GND
Document number: DS36623 Rev. 3 - 2 9 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT Package Outline Dimensions Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) Package Type: TSOT26 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: TSOT26 TSOT26 Dim Min Max Typ A 1.00 A1 0.01 0.10 A2 0.84 0.90 D 2.90 E 2.80 E1 1.60 b 0.30 0.45 c 0.12 0.20 e 0.95 e1 1.90 L 0.30 0.50 L2 0.25 θ 0° 8° 4° θ1 4° 12° All Dimensions in mm Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 c L E1 E D e 6x b 4x 1 A C C X (6x) Y (6x)
Document number: DS36623 Rev. 3 - 2 10 of 10 www.diodes.com August 2015 © Diodes Incorporated AP3402 NEW PRODUCT IMPORTANT NOTICE DIODES INCORPORATED MA KES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or oth er changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liabil ity arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license unde r its patent or trademark rights, nor the rights of others. Any Customer or user of this document or produc ts described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diod es Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product nam es and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or support that may be provided by Diodes Incorporated. Furthe r, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2015, Diodes Incorporated www.diodes.com