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Diodes Semiconductor Electronic Components Datasheet

AP3436A Datasheet

1.25MHz High Performance Synchronous Buck Converter

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AP3436A pdf
Description
A Product Line of
Diodes Incorporated
AP3436/A
3A, 1.25MHz High Performance Synchronous Buck Converter
Pin Assignments
The AP3436/A is a step-down DC-DC converter with integrated
power stage capable of driving up to 3A continuous output current. It
integrates 2 N-channel power MOSFETs with low on-resistance.
Current mode control provides fast transient response and cycle-by-
cycle current limit.
For AP3436, the regulator adopts current-mode in forced pulse-width
modulation (PWM) mode with 1.25MHz switching frequency
internally, which allows small-sized components, such as capacitors
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
current is high or low.
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
switching frequency under heavy load condition. At light load, the
regulator enters a PSM mode to minimize the switching loss by
reducing the switching frequency.
The AP3436/A provides EN function. Pulling this pin high statically
enables the device while pulling the pin low statically for longer than
10μs will shut it down.
Under Voltage Lockout is internally set at 2.75V for VCC detection.
The output voltage startup ramp is controlled by the soft start. An
open drain power good signal indicates the output is within 75% to
125% of its nominal voltage.
The AP3436/A is available in U-DFN3030-10 package.
Applications
(Top View)
Pin 1 Mark
FB 1
10 EN
VCC 2
11
9 PGOOD
VIN 3 EP 8 BOOT
GND 4
7 SW
GND 5
6 SW
Features
U-DFN3030-10
Analog Power Input VCC Range: 3.0V to 5.5V
Power Input VIN Range: 1.3V to 5.5V
0.6V Reference Voltage with ±1.5% Precision
2 MOSFETs (Typ 50m) for High Efficiency at 3A Loads
High Efficiency: Up to 95%
Output Current: 3A
Current Mode Control
Built-in Soft Start Function
UV and OV Power Good Output
Built-in UV and OV Protection Function
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Thermally Enhanced 3mm×3mm DFN Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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 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.
AP3436/A
Document number: DS37212 Rev. 2 - 2
1 of 15
www.diodes.com
April 2014
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP3436A Datasheet

1.25MHz High Performance Synchronous Buck Converter

No Preview Available !

AP3436A pdf
Typical Applications Circuit
A Product Line of
Diodes Incorporated
AP3436/A
VCC
CVCC
RPG
VIN
CIN
VOUT
9
PGOOD
10 EN
2
VCC
1 FB
VIN
BOOT
3
CBOOT
8
SW 6
SW 7
GND 4
GND 5
EP 11
L1
COUT
RFB1
RFB2
Note 4: When using a single power supply for VCC and VIN, a 4.7resistor should be placed between them for noise isolation.
Component
CVCC
RPG
RFB2
RFB1
Value
1
10
TBD
TBD
Unit
µF
k
k
k
Component
CIN
CBOOT
L1
COUT
Table 1. Component Guide
Value
44
0.1
1.5
88
Unit
µF
µF
µH
µF
AP3436/A
Document number: DS37212 Rev. 2 - 2
2 of 15
www.diodes.com
April 2014
© Diodes Incorporated


Part Number AP3436A
Description 1.25MHz High Performance Synchronous Buck Converter
Maker Diodes Incorporated
Total Page 15 Pages
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AP3436A pdf




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