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AP65550 Datasheet

650kHz ADAPTIVE COT STEP-DOWN CONVERTER

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AP65550
5A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Description
Pin Assignments
The AP65550 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 TV
and monitor.
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 adaptive on-time control supports seamless transition between
continuous conduction mode (CCM) at higher load conditions and
discontinuous conduction mode (DCM) at lighter load conditions.
DCM allows AP65550 maintain high efficiency at light load conditions.
The AP65550 also features programmable soft-start, UVLO, OTP and
OCP to protect the circuit.
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: 65mΩ Internal High-side Switch and
36mΩ Internal Low-side Switch
Wide Input Voltage Range: 4.5V to 18V
Output Voltage Range: 0.76V to 6V
5A Continuous Output Current
650kHz Switching Frequency
Built-in Over Current Limit
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)
( Top View )
EN 1
FB 2
VREG5 3
SS 4
8
7
6
5
SO-8EP
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
VIN
BS
SW
GND
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 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.
Typical Applications Circuit
INPUT
VIN
12V
C1
20μF
8
IN
ON 1
OFF
EN
C4
8.2nF
4
SS
7
BST
6
SW
AP65550
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
AP65550
Document number: DS36336 Rev. 2 - 2
1 of 14
www.diodes.com
April 2014
© Diodes Incorporated
http://www.Datasheet4U.com


Diodes Semiconductor Electronic Components Datasheet

AP65550 Datasheet

650kHz ADAPTIVE COT STEP-DOWN CONVERTER

No Preview Available !

AP65550
Pin Descriptions
Pin
Name
EN
FB
VREG5
SS
GND
SW
BS
VIN
EP
Pin Number
SO-8EP
Function
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. Pull up with 100kΩ resistor 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.
Power Switching Output. SW is the switching node that supplies power to the output. Connect the
6 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.
Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage across
7 the bootstrap capacitor drives the internal high-side NMOS switch. A 0.1μF (typical) capacitor is
required for proper operation
8
Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC
input voltage constant.
Connect the exposed thermal pad to GND on the PCB
Functional Block Diagram
Figure 2. Functional Block Diagram
AP65550
Document number: DS36336 Rev. 2 - 2
2 of 14
www.diodes.com
April 2014
© Diodes Incorporated
http://www.Datasheet4U.com


Part Number AP65550
Description 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Maker Diodes
Total Page 14 Pages
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