STEP-DOWN CONVERTER. AP65352 Datasheet

AP65352 CONVERTER. Datasheet pdf. Equivalent


Diodes AP65352
AP65352
3A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Description
The AP65352 is an adaptive, constant on-time mode synchronous
buck converter providing high efficiency, excellent transient response
and high DC output accuracy for low-voltage regulation in digital
TVs and monitors.
The constant-on-time control scheme handles wide input/output
voltage ratios and provides low external component count. The
internal proprietary circuit enables the device to adopt both low
equivalent series resistance (ESR) output capacitors, such as
SP-CAP or POSCAP and ultra-low ESR ceramic capacitors.
The AP65352 also features programmable soft-start, UVLO, OTP,
OVP and OCP to protect the circuit.
AP65352 operates in continuous conduction mode (CCM) in light load
conditions for better EMI performance. AP65353 and AP65355 are
the options for light-load efficiency enhancement.
Pin Assignments
( Top View )
EN 1
FB 2
VREG5 3
SS 4
Exposed
Pad
9
SO-8EP
8 VIN
7 BS
6 SW
5 PGND
This IC is available in SO-8EP package.
Features
Fixed Frequency Emulated Constant On-Time Control
Good Stability Independent of the Output Capacitor ESR
Fast Load Transient Response
Synchronous Rectification: 90Internal High-Side Switch and
57mΩ Internal Low-Side Switch
Wide Input Voltage Range: 4.5V to 18V
Output Voltage Range: 0.76V to 6V
3A Continuous Output Current
650kHz Switching Frequency
Built-in Overcurrent Limit
Built-in Overvoltage Protection
Built-in Thermal Shutdown Protection
Programmable Soft-Start
Pre-Biased Start-Up
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Gaming Consoles
Flat Screen TV Sets and Monitors
Set-Top Boxes
Distributed Power Systems
Home Audio
Consumer Electronics
Network Systems
FPGA, DSP and ASIC Supplies
Green Electronics
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.
AP65352
Document number: DS38482 Rev. 1 - 2
1 of 15
www.diodes.com
December 2015
© Diodes Incorporated


AP65352 Datasheet
Recommendation AP65352 Datasheet
Part AP65352
Description 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Feature AP65352; AP65352 3A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65352 is an adaptive, co.
Manufacture Diodes
Datasheet
Download AP65352 Datasheet




Diodes AP65352
Typical Applications Circuit
INPUT
VIN
12V
C1
20μF
8
IN
ON 1
OFF
EN
C4
8.2nF
4
SS
7
BST
6
SW
AP65352
5
GND
2
FB
3
VREG5
C5 L1
0.1µF 1.5μH
R1
8.25kΩ
R2
22.1kΩ
C3
1µF
OUTPUT
VOUT
1.05V
C2
44μF
Figure 1 Typical Application Circuit
AP65352
Pin Descriptions
Pin
Name
EN
FB
VREG5
SS
GND
Pin Number
Function
SO-8EP
1
Enable input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low
to turn off. It can be safely connected to VIN directly for automatic startup.
2
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider connected to
it from the output voltage.
3
Internal power supply output pin to connect an additional capacitor. Connect a 1μF (typical) capacitor as close as
possible to the VREG5 and GND. This pin is not active when EN is low.
4
Soft-start control input pin. SS controls the soft start period. Connect a capacitor from SS to GND to set the soft-start
period.
5 Ground pin is the main power ground for the switching circuit.
SW
6
Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter
from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch.
BS
7
Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage across the bootstrap
capacitor drives the internal high-side NMOS switch. A 0.1μF (typical) capacitor is required for proper operation
VIN
8
Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC input voltage
constant.
EP 9 Connect the exposed thermal pad to GND on the PCB.
AP65352
Document number: DS38482 Rev. 1 - 2
2 of 15
www.diodes.com
December 2015
© Diodes Incorporated



Diodes AP65352
Functional Block Diagram
AP65352
Figure 2 Functional Block Diagram
AP65352
Document number: DS38482 Rev. 1 - 2
3 of 15
www.diodes.com
December 2015
© Diodes Incorporated







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