AP3409 Datasheet PDF - Diodes Incorporated

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AP3409
Diodes Incorporated

Part Number AP3409
Description 4MHz HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER
Page 11 Pages


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A Product Line of
Diodes Incorporated
AP3409/A
3A, 4MHz HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER
Description
Pin Assignments
The AP3409/A is a current mode, PWM synchronous buck DC/DC
converter, capable of driving a 3A load with high efficiency, excellent
line and load regulation. It operates in continuous PWM mode.
The AP3409/A integrates synchronous P-channel and N-channel
power MOSFET switches with low on-resistance. It is ideal for
portable applications powered from a single Li-ion battery. 100% duty
cycle and low on-resistance P-channel internal power MOSFET can
maximize the battery life.
The switching frequency of AP3409/A can be programmable from
300kHz to 4MHz, 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.
The AP3409/A is available in U-DFN3030-10 package.
Features
Input Voltage Range: 2.6V to 5.5V
Adjustable Output from 0.8V to 5V
0.8V Reference Voltage with ±2% Precision
Output Current: 3A
High Efficiency up to 95%
Low RDSON Internal Switches
Programmable Frequency: 300kHz to 4MHz
Current Mode Control
Forced Continuous-mode Operation
100% Duty Cycle
Built-in Soft-start
Built-in Short Circuit Protection
Built-in Thermal Shutdown Protection
Built-in Current Limit Function
PGOOD Output Voltage Monitoring (For AP3409A)
U-DFN3030-10 package
Totally Lead-free & Fully RoHS Compliant (Note 1 & 2)
Halogen and Antimony Free. GreenDevice (Note 3)
(Top View)
Pin 1 Mark
SHDN/RT 1
GND 2
SW 3
SW 4
PGND 5
Exposed Pad
Connected to
PGND
10 COMP
9 FB
8 VDD
7 PVDD
6 PVDD
U-DFN3030-10 (DN Package)
For AP3409
(Top View)
Pin 1 Mark
SHDN/RT 1
GND 2
SW 3
SW 4
PGND 5
Exposed Pad
Connected to
PGND
10 COMP
9 FB
8 PGOOD
7 VDD
6 PVDD
U-DFN3030-10 (DN Package)
For AP3409A
Applications
Portable Media Player
Digital Still and Video Cameras
Notebook
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.
AP3409/A
Document number: DS36789 Rev. 2 - 2
1 of 11
www.diodes.com
January 2014
© Diodes Incorporated



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Typical Applications Circuit (Note 4)
A Product Line of
Diodes Incorporated
AP3409/A
VIN
5V
ROSC 330k
SHDN/RT COMP
GND
SW
PGND
FB
VDD
PVDD
L1 2.0mH
RCOMP 30k CCOMP 1000pF
R2 240k
C1
22pF
CIN
22mF
R1
510k
COUT
22mF ×2
Typical Application of AP3409
VOUT
2.5V/3A
VIN
5V
ROSC 330k
SHDN/RT COMP
GND
SW
PGND
FB
PGOOD
R4
VDD 100k
(PVDD)
L1 2.0mH
RCOMP 30k CCOMP 1000pF
R2 240k
C1
22pF
CIN
22mF
R1
510k
COUT
22mF ×2
VOUT
2.5V/3A
Notes 4:
VOUT
VFB (R1 R2)
R2
Typical Application of AP3409A
AP3409/A
Document number: DS36789 Rev. 2 - 2
2 of 11
www.diodes.com
January 2014
© Diodes Incorporated



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Pin Descriptions
Pin Number
AP3409
AP3409A
11
22
3, 4 3, 4
55
6, 7 6
87
8
99
10 10
A Product Line of
Diodes Incorporated
AP3409/A
Pin Name
SHDN/RT
GND
SW
PGND
PVDD
VDD
PGOOD
FB
COMP
Function
Oscillator resistor input. Connect a resistor to GND from this pin to set the
switching frequency. Forcing this pin to VDD to shutdown the device
Signal ground. All small-signal ground, such as the compensation
components and exposed pad should be connected to this, which in turn
connects to PGND at one point
Internal power switch output. Connect this pin with one terminal of the
inductor
Power ground. Connect this pin as close as possible to CIN and COUT
Power Input Supply. Decouple this pin to PGND with a capacitor
Signal input supply. Decouple this pin to GND with a capacitor. Normally
VDD is equal to VPVDD
Power good indicator. This pin is open-drain logic output that is pulled to
ground when the output voltage is not within ±12.5% of regulation point
Feedback voltage. This pin is the inverting input of internal error amplifier.
It senses the converter output voltage through an external resistor
divider. The internal reference voltage is 0.8V, which determines the
output voltage through the resistor divider
Compensation input. This pin is the output of internal error amplifier.
Connect external compensation elements to this pin to stabilize the
control loop
Functional Block Diagram
SHDN/RT
1
SD
10
COMP
Oscillator
0.8V
FB 9
EA
Clamp
SS
8
VDD
0.4V
VREF
SUM
CS
PWM OCP
Control
Logic
UVLO OTP
DC
6, 7 PVDD
3, 4 SW
5
PGND
2
GND
Functional Block Diagram of AP3409
AP3409/A
Document number: DS36789 Rev. 2 - 2
3 of 11
www.diodes.com
January 2014
© Diodes Incorporated



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Functional Block Diagram (Cont.)
A Product Line of
Diodes Incorporated
AP3409/A
SHDN/RT
1
SD
10
COMP
Oscillator
0.8V
FB 9
EA
Clamp
0.4V
SS
0.725V
0.9V
SUM
CS
PWM OCP
Control
Logic
PGOOD 8
VREF
UVLO OTP
7
VDD
DC
Functional Block Diagram of AP3409A
6 PVDD
3, 4
SW
5
PGND
2 GND
Absolute Maximum Ratings (Note 5)
Symbol
VDD
VPVDD
VFB
VCOMP
VSW
VRT
θJA
θJC
TJ
TSTG
TLEAD
Parameter
VDD Pin Voltage
PVDD Pin Voltage
FB Pin Voltage
COMP Pin Voltage
SW Pin Voltage
SHDN/RT Pin Voltage
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (Machine Model)
ESD (Human Body Model)
Rating
-0.3 to 6
-0.3 to 6
-0.3 to 6
-0.3 to 6
-0.3 to VIN+0.3
-0.3 to 6
110
3
+150
-65 to +150
+260
200
2000
Unit
V
V
V
V
V
V
ºC/W
ºC/W
ºC
ºC
ºC
V
V
Note 5: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
AP3409/A
Document number: DS36789 Rev. 2 - 2
4 of 11
www.diodes.com
January 2014
© Diodes Incorporated



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