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AP3440 Datasheet

2MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER

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AP3440 pdf
A Product Line of
Diodes Incorporated
AP3440
4A, 2MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER
Description
The AP3440 is a current mode, PWM synchronous buck (step-down)
DC-DC converter, capable of driving a 4A load with high efficiency,
excellent line and load regulation.
The device integrates two N-channel power MOSFETs with low on-
resistance. Current mode control provides fast transient response and
cycle-by-cycle current limit.
The switching frequency of AP3440 can be programmable from
200kHz to 2MHz, which allows small-sized components, such as
capacitors and inductors. A standard series of inductors from several
different manufacturers are available. This feature greatly simplifies
the design of switch-mode power supplies.
Under voltage lockout is internally set at 2.6V, but can be increased
by programming the threshold with a resistor network on the enable
pin. The output voltage startup ramp is controlled by the soft-start pin.
An open drain power good signal indicates the output is within 93% to
107% of its nominal voltage.
The AP3440 is available in U-QFN3030-16 package.
Pin Assignments
(Top View)
Pin 1 Mark
16 15 14 13
VIN 1
VIN 2
GND 3
EP
GND 4
12 SW
11 SW
10 SW
9 SS
56 78
U-QFN3030-16
Applications
Low-voltage, High-density Power Systems
Point of Load Regulation for High Performance DSPs, FPGAs,
ASICs and Microprocessors
Broadband, Networking and Optical Communications
Infrastructure
Features
Input Voltage Range: 2.95V to 5.5V
0.8V Reference Voltage with ±3% Precision
Two 30m(Typical) MOSFETs for High Efficiency at 4A Load
High Efficiency: Up to 94%
Output Current: 4A
Programmable Frequency:200kHz to 2MHz
Current Mode Control
Synchronizes to External Clock
Adjustable Soft-start
Soft Start-up into Pre-biased Output
UV and OV Power Good Output
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Programmable UVLO Function
Built-in Over Voltage Protection
Thermally Enhanced 3mm×3mm 16-pin U-QFN3030-16
Totally Lead-free & Fully RoHS Compliant (Note1 & 2)
Halogen and Antimony Free. GreenDevice (Note 3)
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.
AP3440
Document number: DS36691 Rev. 3 - 2
1 of 15
www.diodes.com
July 2014
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP3440 Datasheet

2MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER

No Preview Available !

AP3440 pdf
Typical Applications Circuit
A Product Line of
Diodes Incorporated
AP3440
VIN=5V
C1
C2 C3
10mF 0.1mF
R4
R1 100kΩ
R2
16 VIN
U1
SW 10
1 VIN
SW 11
2 VIN
SW 12
14 PGD
BOOT 13
15 EN AP3440 FB 6
7 COMP
GND 3
8 RT/CLK
4
GND
9 SS
AGND 5
C5
Optional
R3
7.5kΩ
C4
2.7nF
R5
180kΩ
C7
0.01mF
L1 1.5mH
R8 2.2Ω
(Optional)
C6
0.1mF
C10 2.2nF
(Optional)
VOUT=1.8V
R7
10kΩ
R6 12.5kΩ
C8
22mF
C9
22mF
Pin Description
Pin Number
1,2,16
3,4
5
6
7
8
9
10,11,12
13
14
15
EP
Pin Name
Function
VIN
GND
Supply input pin. A capacitor should be connected between the VIN and GND pin to keep the
DC input voltage constant
Power ground. This pin should be electrically connected to the power pad under the IC
AGND
Analog ground. This pin should be electrically connected to GND close to the device
FB
COMP
RT/CLK
SS
SW
BOOT
PGD
EN
Exposed Thermal Pad
Feedback pin. Inverting node of the transconductance error amplifier
Compensation pin. This pin is the output of the transconductance error amplifier and the input
to the current comparator. Connect external compensation elements to this pin to stabilize the
control loop
Resistor timing or external clock input pin
Soft-start pin. An external capacitor connected to this pin sets the output voltage rise time. This
pin can also be used for tracking
Internal power switch output pin. This pin is connected to the inductor and bootstrap capacitor
Bootstrap pin. A bootstrap capacitor is connected between the BOOT pin and SW pin. The
voltage across the bootstrap capacitor drives the internal high-side power MOSFET
Power good indicator output. Asserts low if output voltage is low due to thermal shutdown,
over-current, over/under-voltage or EN shut down
Enable pin, internal pull-up current source. Pull below 1.2V to disable. Float to enable. Can be
used to set the on/off threshold (adjust UVLO) with two additional resistors
Exposed Pad can be connected to GND, for best thermal performance thermal vias are
recommended under the package
AP3440
Document number: DS36691 Rev. 3 - 2
2 of 15
www.diodes.com
July 2014
© Diodes Incorporated


Part Number AP3440
Description 2MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER
Maker Diodes Incorporated
Total Page 15 Pages
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