PART OBSOLETE CONTACT US AP3436/A 3A, 1.25MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER OBSOLETE - PART DISCONTINUED Description Pin Assignments (Top View) The AP3436/A is a step-down DC-DC converter with integrated power stage capable of driving up to 3A continuous output current. It integrates 2 N-channel power MOSFETs with low on-resistance. Current mode control provides fast transient response and cycle-bycycle current limit. Pin 1 Mark FB 1 VCC 2 10 11 For AP3436, the regulator adopts current-mode in forced pulse-width modulation (PWM) mode with 1.25MHz switching frequency internally, which allows small-sized components, such as capacitors and inductors. This feature greatly simplifies the design of switchmode power supplies. Under PWM mode, the device remains at the fixed PWM operation (typical at 1.25MHz), regardless of if the load current is high or low. For AP3436A, the regulator operates in either fixed PWM mode or a pulse-skipping modulation (PSM) mode depending on the different load conditions. The device can operate at typical 1.25MHz fixed switching frequency under heavy load condition. At light load, the regulator enters a PSM mode to minimize the switching loss by reducing the switching frequency. The AP3436/A provides EN function. Pulling this pin high statically enables the device while pulling the pin low statically for longer than 10s will shut it down. Under Voltage Lockout is internally set at 2.75V for VCC detection. The output voltage startup ramp is controlled by the soft start. An open drain power good signal indicates the output is within 75% to 125% of its nominal voltage. The AP3436/A is available in U-DFN3030-10 package. EN 9 PGOOD 8 BOOT VIN 3 GND 4 7 SW GND 5 6 SW EP U-DFN3030-10 Features Analog Power Input VCC Range: 3.0V to 5.5V Power Input VIN Range: 1.3V to 5.5V 0.6V Reference Voltage with 1.5% Precision 2 MOSFETs (Typ 50m) for High Efficiency at 3A Loads High Efficiency: Up to 95% Output Current: 3A Current Mode Control Built-in Soft Start Function UV and OV Power Good Output Built-in UV and OV Protection Function Built-in Over Current Protection Built-in Thermal Shutdown Function Thermally Enhanced 3mmx3mm DFN Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Applications Desktop & Notebook Low Voltage, High Density Power System Consumer Application Such as Set Top Box, LCD Display and CPE Equipment 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 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. AP3436/A Document number: DS37212 Rev. 4 - 4 1 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Typical Applications Circuit VCC VIN CVCC CIN RPG 9 PGOOD 10 EN 2 1 VCC FB AP3436/A OBSOLETE - PART DISCONTINUED VOUT VIN 3 L1 CBOOT BOOT 8 SW SW GND GND EP 6 7 4 5 11 COUT RFB2 RFB1 Note 4: When using a single power supply for VCC and VIN, a 4.7 resistor should be placed between them for noise isolation. Component Value Unit Component Value Unit CVCC 1 F CIN 44 F RPG 10 k CBOOT 0.1 F RFB2 TBD k L1 1.5 H RFB1 TBD k COUT 88 F Table 1. Component Guide AP3436/A Document number: DS37212 Rev. 4 - 4 2 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Pin Descriptions OBSOLETE - PART DISCONTINUED Pin Number Pin Name Function 1 FB Voltage Feedback Input. Connect to VOUT through a voltage divider to set the output voltage 2 VCC Analog Power Input 3 VIN Power Input 4, 5 GND Ground. Must be Connected to GND on PCB 6, 7 SW Power Switch Output 8 BOOT High Side Switch Driver Supply 9 PGOOD Open Drain Power Good Output 10 EN 11 Exposed Pad Enable Thermal Connection to the PCB. Must be connected to GND on PCB Functional Block Diagram PGOOD EN 9 10 VCC 2 VIN 3 Thermal Shutdown UVLO 75% Logic Shutdown Logic EN 125% Boot Charge 8 BOOT Voltage Reference FB Boot UVLO 1 EA PWM + Soft Start Logic and PWM Latch 6,7 Slope Compensation SW Current Sense Current Limit and Short Protection Oscillator 4,5 4,5 GND GND AP3436/A Document number: DS37212 Rev. 4 - 4 3 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Absolute Maximum Ratings (Note 5) Symbol Rating Unit VCC, VIN Pin Voltage -0.3 to 6 V VEN EN Pin Voltage -0.3 to 6 V VSW SW Pin Voltage -0.3 to VIN+0.3 V -5 to VIN+5 V FB Pin Voltage -0.3 to 6 V VPGD PGOOD Pin Voltage -0.3 to 6 V VBOOT_SW BOOT to SW Voltage 0 to 6 V OBSOLETE - PART DISCONTINUED VCC, VIN VSW_TRANSIENT VFB Note 5: Parameter SW Pin Transient Voltage (<50ns) JA Thermal Resistance (Junction to Ambient, Simulation) 33 C/W JC Thermal Resistance (Junction to Case) 3 C/W TJ Operating Junction Temperature -40 to +150 C TSTG Storage Temperature -65 to +150 C TLEAD Lead Temperature (Soldering, 10sec) +260 C VHBM ESD (Human Body Model) 2000 V VMM ESD (Machine Model) 200 V 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 Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Symbol Parameter Min Max Unit VCC Analog Input Voltage 3.0 5.5 V VIN Power Input Voltage 1.3 5.5 V 3 - A Output Voltage 0.8 VIN V Operating Ambient Temperature -40 +85 C IOUT(MAX) VOUT TA Maximum Output Current AP3436/A Document number: DS37212 Rev. 4 - 4 4 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Electrical Characteristics (VCC = 5V, VIN = 5V, TA = +25C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit OBSOLETE - PART DISCONTINUED SUPPLY VOLTAGE (VCC, VIN PIN) VCC Analog Power Input Voltage - 3.0 - 5.5 V VIN Power Input Voltage - 1.3 - 5.5 V IQ Quiescent Current VFB = 1.5V, VCC = 5V, VIN = 5V - 400 - A Shutdown Supply Current VEN = 0V, 3.0V VCC 5.5V, 1.3V VIN 5.5V - - 1 A Internal Under Voltage Lockout Threshold for VCC - - 2.75 2.85 V Internal Under Voltage Hysteresis for VCC - - 150 - mV 3.0V VCC 5.5V 0.591 0.600 0.609 V 3.0V VCC 5.5V 1.0 1.25 1.5 MHz VBOOT_SW = 5.0V - 50 100 m VBOOT_SW = 3.0V - 70 140 m VCC = 5.0V - 50 100 m VCC = 3.0V - 70 140 m ISHDN POWER ON RESET VUVLO VHYS_VCC VOLTAGE REFERENCE (FB PIN) VFB Voltage Reference INTERNAL PWM FREQUENCY f PWM Frequency MOSFET SPEC RON_H RON_L High Side Switch On-resistance Low Side Switch On-resistance CURRENT LIMIT ILIMIT Current Limit Threshold - 4.8 7.6 - A Thermal Shutdown - - +160 - C Hysteresis - - +20 - C BOOT Charge Resistor VCC = 5.0V - 16 - BOOT to SW UVLO VCC = 3.0V - 2.2 - V Soft Start Time - 0.8 - 2 ms THERMAL SHUTDOWN TTSD - BOOT SPEC (BOOT PIN) RBOOT - SOFT START tSS AP3436/A Document number: DS37212 Rev. 4 - 4 5 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Electrical Characteristics (Cont. VCC = 5V, VIN = 5V, TA = +25C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit - - - 0.8 V - 1.6 - - V VFB falling (Fault) 70 75 - VFB rising (Good) 77 82 - VFB rising (Fault) - 125 130 VFB falling (Good) - 118 123 Delay Time for PGOOD from High to Low - - 30 - s Internal Power Good Pull Low Resistance - - - 150 External Pull-up Resistance Range - 3000 - - VUVP Output Under Voltage Protection Threshold VIN = 1.3 to 5.5V - - 0.5x VOUT V tUVP Delay Time for UVP Triggered VIN = 1.5 to 5V - 65 - s VOVP Output Over Voltage Protection Threshold VIN = 1.3 to 5.5V 1.5x VOUT - - V tOVP Delay Time for OVP Triggered VIN = 1.5 to 5V - 65 - s IOUT Output Current VIN = 1.5 to 5V, VOUT = 1.0V 3 - - A - Output Voltage Line Regulation VIN = 1.5 to 5V, IOUT = 100mA - 0.4 - %x VOUT/V - Output Voltage Load Regulation IOUT = 0A to 3A - 0.3 - %x VOUT/A - 2.5 - %x VOUT/A - 80 - % OBSOLETE - PART DISCONTINUED ENABLE (EN PIN) VEN_L EN Pin Threshold VEN_H POWER GOOD (PGOOD PIN) VFBTH tPG_DLY RPG RPG_UP %VREF Feedback Threshold SYSTEM PERFORMANCE VTRAN Output Voltage Load Transient Efficiency AP3436/A Document number: DS37212 Rev. 4 - 4 VIN = 5V, VOUT = 1.0V, dI/dt = 400mA/s VCC = 5V, VIN=5V, IOUT = 3A, VOUT = 1.2V 6 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Performance Characteristics 0.610 90 0.608 80 0.606 70 0.604 Reference Voltage(V) Efficiency (%) Reference Voltage vs. Input Voltage 100 60 50 40 30 AP3436 20 0.602 0.600 0.598 0.596 0.594 VIN=VCC=5.0V 10 0.592 VOUT=1.0V 0.590 3.00 0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 VIN=VCC=VEN 3.25 3.50 3.75 Reference Voltage vs. Temperature 4.50 4.75 5.00 5.25 5.50 1.50 1.45 0.63 VIN=VCC=5.0V 1.40 PWM Frequency (MHz) 0.62 Reference Voltage(V) 4.25 PWM Frequency vs. Input Voltage 0.64 0.61 0.60 0.59 0.58 1.35 1.30 1.25 1.20 1.15 1.10 0.57 1.05 0.56 -40 1.00 3.00 -20 0 20 40 60 80 100 120 140 VCC=VIN=VEN 3.25 3.50 3.75 Temperature ( C) PWM Frequency vs. Temperature 4.25 4.50 4.75 5.00 5.25 5.50 Current Limit vs. Input Voltage 1.50 10.0 1.45 9.5 VIN=VCC=5.0V 1.40 4.00 Input Voltage (V) o 9.0 8.5 Current Limit (A) 1.35 1.30 1.25 1.20 1.15 8.0 7.5 7.0 6.5 1.10 6.0 1.05 5.5 1.00 -40 4.00 Input Voltage(V) Output Current (A) PWM Frequency (MHz) OBSOLETE - PART DISCONTINUED Efficiency vs. Output Current -20 0 20 40 60 80 100 120 5.0 3.00 140 Document number: DS37212 Rev. 4 - 4 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 Input Voltage (V) o Temperature ( C) AP3436/A VIN=VCC=VEN 7 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Performance Characteristics (Cont.) Current Limit vs. Temperature Line Regulation vs. Input Voltage 0.4 8.75 0.3 8.50 VIN=VCC=5.0V 0.2 Line Regulation (%) 8.25 Current Limit (A) 8.00 7.75 7.50 7.25 7.00 6.75 0.1 0.0 -0.1 -0.2 VIN= VCC= VEN 6.50 -0.3 VOUT = 1.0V 6.25 6.00 -40 -20 0 20 40 60 80 100 120 -0.4 3.00 140 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 Input Voltage (V) o Temperature ( C) Load Regulation vs. Output Current Power on Waveform (VIN=VCC=5V, VOUT=1V, IOUT=3A) 1.0 0.8 0.6 Load Regulation (%) OBSOLETE - PART DISCONTINUED 9.00 VIN 2V/div VOUT 500mV/div 0.4 0.2 0.0 -0.2 -0.4 -0.6 IL 1A/div VIN=VCC=VEN=5.0V -0.8 VOUT=1.0V -1.0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 Time 400s/div Output Current (A) Power off Waveform (VIN=VCC=5V, VOUT=1V, IOUT=3A) VIN 2V/div VOUT 1V/div IL 2A/div Enable Waveform (VIN=VCC=5V, VOUT=1V, IOUT=3A) VCC/IN 2V/div VEN 1V/div VOUT 500mV/div IL 1A/div Time 1ms/div AP3436/A Document number: DS37212 Rev. 4 - 4 8 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Performance Characteristics (Cont.) OBSOLETE - PART DISCONTINUED Disable Waveform (VIN=VCC=5V, VOUT=1V, IOUT=3A) VCC/IN 2V/div VEN 1V/div VOUT 500mV/div IL 1A/div Load Transient Response (VIN=VCC=5V, VOUT=1V, IOUT=0 to 3A) VOUT_AC 20mV/div IOUT 1A/div Time 200s/div Time 200s/div Load Transient Response (VIN=VCC=3.3V, VOUT=1V, IOUT=0 to 3A) VOUT_AC 20mV/div IOUT 1A/div Time 200s/div AP3436/A Document number: DS37212 Rev. 4 - 4 9 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Application Information 1. Overview OBSOLETE - PART DISCONTINUED The AP3436/A is a 3A synchronous buck (step-down) converter with two integrated N-channel MOSFETs. For AP3436, the regulator operates in PWM mode with 1.25MHz switching frequency internally, regardless of if the load current is high or low. For AP3436A, when the load is very light, the regulator automatically operates in the PSM mode to minimize the switching loss, thus achieving high efficiency at light load. When the load increases, the regulator automatically switches over to a current-mode PWM operating at nominal 1.25MHz switching frequency. 2. Power On Reset A Power On Reset (POR) circuitry continuously monitors the supply voltage at VCC pin. Once the rising POR threshold is exceeded, the AP3436/A sets itself to active state and is ready to accept chip enable command. The rising POR threshold is typically 2.75V. 3. Soft Start A built-in soft-start is used to prevent surge current from power supply input V IN during turn on (Referring to the Functional Block Diagram). The error amplifier is a three-input device. Reference voltage VREF or the internal soft-start voltage VSS whichever is smaller dominates the behavior of the non-inverting inputs of the error amplifier. VSS internally ramps up to 0.6V after the soft-start cycle is initiated. The ramp is created digitally, so the output voltage will follow the VSS signal and ramps up smoothly to its target level. 4. EN Function The AP3436/A provides Enable Function. Pulling this pin higher than 1.6V statically enables the AP3436/A while pulling the pin lower than 0.8V statically for longer than 10s will shutdown the IC. 5. Adjusting Output Voltage The output voltage is set with a resistor divider from the FB pin. It is recommended to use divider resistors with 1% tolerance or better. Start with a 100k for the resistor R1 and use the following equation to calculate R2. Consider using larger value resistors to improve efficiency at very light loads. If the values are too high, the regulator is more susceptible to noise and the voltage errors caused by FB input current are noticeable. R2 R1 0.6 VOUT 0.6 VOUT AP3436/A R1 FB R2 0.6V VSS + + Figure 1. Voltage Divider Circuit 6. Short Circuit Protection (SCP) The AP3436/A has Over Current Protection (OCP) and Under Voltage Protection (UVP) functions. 6.1 OCP Function The high side switch current is detected during each cycle. During SCP conditions, the output voltage is pulled down and the switch current is increased. Once the increased high side switching current is detected to trigger the current limit of high side switch, the high side switch will be immediately turned off and will not be turned on again until the next switching cycle. When over current condition is removed, the AP3436/A will recover back to normal operation again. 6.2 UVP Function The FB voltage is also monitored for Under Voltage Protection. The UV threshold is set at 0.2V. The under voltage protection has 65s triggered delay. When UVP is triggered, both high side and low side are shutdown immediately. The UVP is a latched function, reset power supply or EN pin to restart AP3436/A again. AP3436/A Document number: DS37212 Rev. 4 - 4 10 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Application Information (Cont.) 7. Over Voltage Protection (OVP) The output voltage is continuously monitored for Over Voltage Protection by FB pin. When it is larger than 1.67 times as setting, the OVP function is triggered. The Over Voltage Protection has 65s triggered delay. OBSOLETE - PART DISCONTINUED When OVP is triggered, both high side and low side are shutdown immediately and the output voltage is discharged by an internal 1k resistor. 8. Power Good The PGOOD pin output connects an open drain MOSFET. The output is pulled low when the FB voltage enters the fault condition by falling below 75% or rising above 125% of the nominal internal reference voltage. There is a 7% hysteresis on the threshold voltage, so when the FB voltage rises to the good condition above 82% or falls below 118% of the internal voltage reference the PGOOD output MOSFET is turned off. It is recommended to use a pull-up resistor between the values of 3k and 100k to a voltage source that is 5V or less. 9. Thermal Shutdown The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds +160C. Switching is stopped when the junction temperature exceeds the thermal trip threshold. Once the die temperature decreases below +140C, the device reinitiates the soft start operation. The thermal shutdown hysteresis is +20C. AP3436/A Document number: DS37212 Rev. 4 - 4 11 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Ordering Information OBSOLETE - PART DISCONTINUED AP3436X XX XX - XX Product Name Product Version Package Packing RoHS/Green A : AP3436A Blank : AP3436 DN : U-DFN3030-10 TR : Tape & Reel G1 : Green Package Temperature Range U-DFN3030-10 -40 to +85C Function PWM PWM/PSM Part Number Marking ID Packing AP3436DNTR-G1 BDB 5000/Tape & Reel AP3436ADNTR-G1 BDF 5000/Tape & Reel Marking Information AP3436 (Top View) First Line: Logo and Marking ID Second and Third Lines: Date Code Y: Year WW: Work Week of Molding M: Assembly House Code XX: 7th and 8th Digits of Batch No. AP3436A (Top View) First Line: Logo and Marking ID Second and Third Lines: Date Code Y: Year WW: Work Week of Molding M: Assembly House Code XX: 7th and 8th Digits of Batch No. AP3436/A Document number: DS37212 Rev. 4 - 4 12 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A Package Outline Dimensions (All dimensions in mm(inch).) Package Type: U-DFN3030-10 OBSOLETE - PART DISCONTINUED (1) 1.500(0. 059) 0.250(0.010) 1.800(0. 071) 0.550(0. 022) 0.500(0.020) 2.900(0. 114) TYP 3.100(0.122) N6 N10 2.300(0. 090) 2.500(0.098) 2.900(0.114) PIN #1 IDENTIFICATION See DETAIL A 3.100(0. 122) Pin 1 Mark N5 N1 0.200(0.008) 0.300(0. 012) 0.000(0. 000) DETAIL A 0.050(0.002) A3 A 2 1 2 1 2 1 Pin 1 options A Symbol A3 min(mm) max(mm) min(inch) max(inch) min(mm) max(mm) min(inch) max(inch) AP3436/A Document number: DS37212 Rev. 4 - 4 Option 1 0.700 0.800 0.028 0.031 Option 2 0.570 0.630 0.022 0.025 0.153 13 of 15 www.diodes.com 0.253 0.150 (Typ) 0.006 0.010 0.006 (Typ) February 2020 (c) Diodes Incorporated AP3436/A Suggested Pad Layout Package Type: U-DFN3030-10 OBSOLETE - PART DISCONTINUED (1) X1 Y1 X2 Y Y2 E Dimensions Y (mm)/(inch) X1 (mm)/(inch) Y1 (mm)/(inch) X2 (mm)/(inch) Y2 (mm)/(inch) E (mm)/(inch) Value 3.300/0.130 0.300/0.012 0.600/0.024 2.600/0.102 1.800/0.071 0.500/0.020 AP3436/A Document number: DS37212 Rev. 4 - 4 14 of 15 www.diodes.com February 2020 (c) Diodes Incorporated AP3436/A IMPORTANT NOTICE OBSOLETE - PART DISCONTINUED DIODES INCORPORATED MAKES 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). 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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 in 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 devices 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. Further, 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 (c) 2020, Diodes Incorporated www.diodes.com AP3436/A Document number: DS37212 Rev. 4 - 4 15 of 15 www.diodes.com February 2020 (c) Diodes Incorporated