NOT RECOMMENDED FOR NEW DESIGN NO ALTERNATE PART AP3436/A 3A, 1.25MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER Description Pin Assignments The AP3436/A is a step-down DC-DC converter with integrated (Top View) power stage capable of driving up to 3A continuous output current. It Pin 1 Mark integrates 2 N-channel power MOSFETs with low on-resistance. Current mode control provides fast transient response and cycle-by- FB 1 10 EN cycle current limit. VCC 2 9 PGOOD 11 VIN 3 8 BOOT EP For AP3436, the regulator adopts current-mode in forced pulse-width modulation (PWM) mode with 1.25MHz switching frequency GND 4 7 SW internally, which allows small-sized components, such as capacitors GND 5 6 SW and inductors. This feature greatly simplifies the design of switch- mode power supplies. Under PWM mode, the device remains at the fixed PWM operation (typical at 1.25MHz), regardless of if the load U-DFN3030-10 current is high or low. Features 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 Analog Power Input V Range: 3.0V to 5.5V CC switching frequency under heavy load condition. At light load, the Power Input V Range: 1.3V to 5.5V IN regulator enters a PSM mode to minimize the switching loss by 0.6V Reference Voltage with 1.5% Precision reducing the switching frequency. 2 MOSFETs (Typ 50m) for High Efficiency at 3A Loads High Efficiency: Up to 95% The AP3436/A provides EN function. Pulling this pin high statically Output Current: 3A enables the device while pulling the pin low statically for longer than Current Mode Control 10s will shut it down. Built-in Soft Start Function UV and OV Power Good Output Under Voltage Lockout is internally set at 2.75V for V detection. CC Built-in UV and OV Protection Function The output voltage startup ramp is controlled by the soft start. An open drain power good signal indicates the output is within 75% to Built-in Over Current Protection 125% of its nominal voltage. Built-in Thermal Shutdown Function Thermally Enhanced 3mm3mm DFN Package The AP3436/A is available in U-DFN3030-10 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 NOT RECOMMENDED FOR NEW DESIGN NO ALTERNATE PART AP3436/A Typical Applications Circuit V CC V IN V OUT C VCC C IN RPG 9 3 PGOOD VIN L1 C BOOT 10 8 EN BOOT 6 C 2 OUT SW VCC 7 SW 4 GND 5 1 GND FB 11 EP R FB2 R FB1 Note 4: When using a single power supply for V and V , a 4.7 resistor should be placed between them for noise isolation. CC IN Component Value Unit Component Value Unit C 1 F C 44 F VCC IN R 10 k C 0.1 F PG BOOT R TBD k L1 1.5 H FB2 R TBD k C 88 F FB1 OUT Table 1. Component Guide 2 of 15 AP3436/A September 2017 Diodes Incorporated www.diodes.com Document number: DS37212 Rev. 3 - 3 AP3436/A