Data Brief AP64352 (Diodes)

Request Datasheet AP64352 3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS BUCK WITH INTERNAL COMPENSATION Description Pin Assignments
The AP64352 is a 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 75mΩ high-
TOP VIEW
side power MOSFET and a 45mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.
BST 1 8 SW
The AP64352 device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated loop compensation network.
VIN 2 7 GND EXPOSED PAD
The AP64352 design is optimized for Electromagnetic Interference
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(EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and
EN 3 6 SS
turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. AP64352 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%,
RT/CLK 4 5 FB
which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.
SO-8EP
The device is available in an SO-8EP package.
Features Typical Application Circuit
VIN 3.8V to 40V
INPUT VIN BST
3.5A Continuous Output Current
C3 L 100nF OUTPUT
0.8V ± 1% Reference Voltage
5.5μH EN SW VOUT 5V
22µA Low Quiescent Current (Pulse Frequency Modulation)
C4 R1 OPEN 115kΩ C1 AP64352
Programmable Switching Frequency: 100kHz to 2.2MHz
FB C2 10µF 2 x 22µF R2
External Clock Synchronization: 100kHz to 2.2MHz
22.1kΩ
Programmable Soft-Start Time
RT/CLK SS RT Css
Up to 85% Efficiency at 5mA Light Load
200kΩ GND 10nF
Proprietary Gate Driver Design for Best EMI Reduction Frequency Spread Spectrum (FSS) to Reduce EMI Low-Dropout (LDO) Mode Precision Enable Threshold to Adjust UVLO VOUT = 5V, L = 5.5μH VOUT = 3.3V, L = 4.7μH Protection Circuitry o Undervoltage Lockout (UVLO) 100 o Output Overvoltage Protection (OVP) 90 o 80 Cycle-by-Cycle Peak Current Limit
)
70 o Thermal Shutdown
%(
60
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) ncy
50
Halogen and Antimony Free. “Green” Device (Note 3) eic
40
if f
30
E
20 10 0 0.001 0.010 0.100 1.000 10.000
IOUT (A)
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. 1 of 5 AP64352 Databrief October 2019
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