AP3429/A
1.0MHZ, 2A STEP-DOWN DC-DC BUCK CONVERTER
Description
The AP3429/A is a 2A step-down DC-DC converter. At heavy load,
the constant frequency PWM control performs excellent stability and
transient response. No external compensation components are
required.
Pin Assignments
(Top View)
EN
The AP3429/A supports a range of input voltages from 2.7V to 5.5V,
allowing the use of a single Li+/Li- polymer cell, multiple
Alkaline/NiMH cell, and other standard power sources. The output
voltage is adjustable from 0.6V to the input voltage. The AP3429/A
employs internal power switch and synchronous rectifier to minimize
external part count and realize high efficiency. During shutdown, the
input is disconnected from the output and the shutdown current is less
than 1μA. Other key features include over-temperature and short
circuit protection, and under-voltage lockout to prevent deep battery
discharge.
The AP3429/A delivers 2A maximum output current while consuming
only 90μA of no-load quiescent current. Ultra-low R
DS(ON)
integrated
MOSFETs and 100% duty cycle operation make the AP3429/A an
ideal choice for high output voltage, high current applications which
require a low dropout threshold.
The AP3429/A is available in TSOT25 package.
1
2
3
5
FB
GND
LX
NEW PRODUCT
4
VIN
TSOT25
Features
Output Current: Up to 2A
Output Voltage: 0.6V to V
IN
Input Voltage: 2.7V to 5.5V
Shutdown Current: <1μA
100% Duty Cycle Operation
1MHz Switching Frequency
Internal Soft Start
No External Compensation Required
Short Circuit Protection
AP3429: Latch Off Protection
AP3429A: Hiccup Mode Protection
AP3429: Latch Off Protection
AP3429A: No Latch Off Protection
Applications
5V or 3.3V Point of Load Conversion
Telecom/Networking Equipment
Set Top Boxes
Storage Equipment
Video Cards
DDR Power Supply
Over Voltage Protection
Thermal Shutdown
TSOT25 package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (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.
AP3429/A
Document number: DS36561 Rev. 3 - 2
1 of 11
www.diodes.com
August 2015
© Diodes Incorporated
AP3429/A
Absolute Maximum Ratings
(Note 4)
Symbol
V
IN
V
EN
V
LX
Input Voltage
EN Pin Voltage
LX Pin Voltage
Feedback Pin Voltage
Power Dissipation (on PCB, T
A
= +25°
C)
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case, Simulation)
Operating Junction Temperature
Storage Temperature
ESD (Machine Model)
ESD (Human Body Model)
Parameter
Rating
-0.3 to 6
-0.3 to V
IN
+0.3
-0.3 to V
IN
+0.3
-0.3 to V
IN
+0.3
0.4
220
130
+150
-55 to +150
200
2000
Unit
V
V
V
V
W
°
C/W
º
C/W
°
C
°
C
V
V
NEW PRODUCT
V
FB
P
D
θ
JA
θ
JC
T
J
T
STG
V
MM
V
HBM
Note 4:
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.
Recommended Operating Conditions
Symbol
V
IN
T
A
T
J
Input Voltage Range
Operating Ambient Temperature
Junction Temperature Range
Parameter
Min
2.7
-40
-40
Max
5.5
+85
+125
Unit
V
°
C
°
C
AP3429/A
Document number: DS36561 Rev. 3 - 2
4 of 11
www.diodes.com
August 2015
© Diodes Incorporated
京公网安备 11010802033920号
EEWORLD
