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AP3418 Datasheet

1.4MHZ HIGH EFFICIENCY SYNCHRONOUS DC-DC BUCK CONVERTER

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AP3418 pdf
A Product Line of
Diodes Incorporated
AP3418
1.5A, 1.4MHZ HIGH EFFICIENCY SYNCHRONOUS DC-DC BUCK CONVERTER
Description
Pin Assignments
The AP3418 is a 1.4MHz fixed frequency, current mode, PWM
synchronous buck (step-down) DC-DC converter, capable of driving a
1.5A load with high efficiency, excellent line and load regulation. The
device integrates synchronous P-channel and N-channel power
MOSFET switches with low on-resistance. It is ideal for powering
portable equipment that runs from a single Li-ion battery.
A standard series of inductors are available from several different
manufacturers optimized for use with the AP3418. This feature greatly
simplifies the design of switch-mode power supplies.
The AP3418 is available in SOT25 package.
(Top View)
EN 1
GND 2
SW 3
5 FB
4 VIN
Features
SOT25
Input Voltage Range: 2.5V to 5.5V
Output Voltage: 0.6V to VIN
ADJ Output
Fixed 1.4MHz Frequency
High Efficiency up to 95%
Output Current: 1.5A
Current Mode Control
100% Duty Cycle in Dropout
Built-in Over Current Protection
Built-in Short Circuit Protection
Built-in Thermal Shutdown Protection
Built-in UVLO Function
Built-in Soft-start
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
LCD TV
Set-top Box
Datacom
Portable Device
Smart Phone
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.
Typical Applications Circuit
R2 R1
15
VIN EN FB
43
VIN SW
AP3418-ADJ
CIN
4.7F
GND
2
L
2.2H
COUT
22F
VOUT
AP3418
Document number: DS37233 Rev. 3 - 2
1 of 11
www.diodes.com
November 2014
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP3418 Datasheet

1.4MHZ HIGH EFFICIENCY SYNCHRONOUS DC-DC BUCK CONVERTER

No Preview Available !

AP3418 pdf
Pin Descriptions
Pin Number
1
2
3
4
5
A Product Line of
Diodes Incorporated
AP3418
Pin Name
EN
GND
SW
VIN
FB
Function
Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this
pin below 0.4V shuts down the IC. When the IC is in shutdown mode, all
functions are disabled to decrease the supply current below 1µA
Ground pin
Power switch output pin. Inductor connection to drain of the internal PFET
and NFET switches
Supply input pin. Bypass to GND with a 4.7µF or greater ceramic
capacitor
This is the feedback pin of the device. Connect this pin directly to the
output if the fixed output voltage version is used. For the adjustable
version, an external resistor divider is connected to this pin
Functional Block Diagram
1
EN
VIN
4
GND
2
VOLTAGE
REFERENCE
0.6V
5
FB
ERROR
AMPLIFIER
OSCILLATOR
CURRENT
SENSE
PWM
MAX
VOCP
COMPARATOR CURRENT LIMIT
0.4V
SHORT
CIRCUIT
PROTECTION
LOGIC
CLK
REVERSE
COMPARATOR
VIN
4
3
SW
2
GND
AP3418
Document number: DS37233 Rev. 3 - 2
2 of 11
www.diodes.com
November 2014
© Diodes Incorporated


Part Number AP3418
Description 1.4MHZ HIGH EFFICIENCY SYNCHRONOUS DC-DC BUCK CONVERTER
Maker Diodes
Total Page 11 Pages
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