Data Brief AP64351 (Diodes)
| Manufacturer | Diodes |
| Description | 3.8V To 40V, 3.5A Low Iq Synchronous Buck with Programmable Soft-start Time |
| Pages / Page | 5 / 1 — Request Datasheet. AP64351. 3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS … |
| File Format / Size | PDF / 429 Kb |
| Document Language | English |
Request Datasheet. AP64351. 3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE SOFT-START TIME. Description
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Request Datasheet AP64351 3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE SOFT-START TIME Description Pin Assignments
The AP64351 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 AP64351 device is easily used by minimizing the external component count due to its adoption of peak current mode control.
VIN 2 7 GND
The AP64351 design is optimized for Electromagnetic Interference
EXPOSED PAD
(EMI) reduction. The device has a proprietary gate driver scheme to
9
resist switching node ringing without sacrificing MOSFET turn-on and
EN 3 6 COMP
turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. AP64351 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one
SS 4 5 FB
frequency for a significant period of time. The device is available in an SO-8EP package.
SO-8EP 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 AP64351
570kHz Switching Frequency
FB C2 10µF 2 x 22µF R2
Programmable Soft-Start Time
22.1kΩ
Up to 85% Efficiency at 5mA Light Load
SS COMP Css R5
Proprietary Gate Driver Design for Best EMI Reduction
10nF GND 14kΩ C6 C5 47pF (Optional)
Frequency Spread Spectrum (FSS) to Reduce EMI
3.3nF
Low-Dropout (LDO) Mode Precision Enable Threshold to Adjust UVLO Protection Circuitry VOUT = 5V, L = 5.5μH VOUT = 3.3V, L = 4.7μH o Undervoltage Lockout (UVLO) o Output Overvoltage Protection (OVP) 100 o Cycle-by-Cycle Peak Current Limit 90 80 o Thermal Shutdown
) %
70
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) (
60
Halogen and Antimony Free. “Green” Device (Note 3) ncy
50
eic
40
iff
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 AP64351 Databrief October 2019
www.diodes.com
© Diodes Incorporated
The AP64351 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 AP64351 device is easily used by minimizing the external component count due to its adoption of peak current mode control.
VIN 2 7 GND
The AP64351 design is optimized for Electromagnetic Interference
EXPOSED PAD
(EMI) reduction. The device has a proprietary gate driver scheme to
9
resist switching node ringing without sacrificing MOSFET turn-on and
EN 3 6 COMP
turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. AP64351 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one
SS 4 5 FB
frequency for a significant period of time. The device is available in an SO-8EP package.
SO-8EP 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 AP64351
570kHz Switching Frequency
FB C2 10µF 2 x 22µF R2
Programmable Soft-Start Time
22.1kΩ
Up to 85% Efficiency at 5mA Light Load
SS COMP Css R5
Proprietary Gate Driver Design for Best EMI Reduction
10nF GND 14kΩ C6 C5 47pF (Optional)
Frequency Spread Spectrum (FSS) to Reduce EMI
3.3nF
Low-Dropout (LDO) Mode Precision Enable Threshold to Adjust UVLO Protection Circuitry VOUT = 5V, L = 5.5μH VOUT = 3.3V, L = 4.7μH o Undervoltage Lockout (UVLO) o Output Overvoltage Protection (OVP) 100 o Cycle-by-Cycle Peak Current Limit 90 80 o Thermal Shutdown
) %
70
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) (
60
Halogen and Antimony Free. “Green” Device (Note 3) ncy
50
eic
40
iff
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 AP64351 Databrief October 2019
www.diodes.com
© Diodes Incorporated
