AP3417C
1.5MHz SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Description
The AP3417C is a high efficiency step-down DC-DC voltage
converter. The chip operation is optimized by peak-current mode
architecture with built-in synchronous power MOSFET switchers. The
oscillator and timing capacitors are all built-in providing an internal
switching frequency of 1.5MHz that allows the use of small surface
mount inductors and capacitors for portable product implementations.
Pin Assignments
(Top View)
(Top View)
Pin 1 Mark
EN
GND
1
2
3
5
FB
NC
EN
1
6
FB
GND
LX
2
EP
5
NEW PRODUCT
Integrated Soft Start (SS), Under Voltage Lock Out (UVLO), Thermal
Shutdown Detection (TSD) and Short Circuit Protection are designed
to provide reliable product applications.
The device is available in adjustable output voltage version ranging
from 0.6V to 0.9×V
IN
when input voltage range is from 2.5V to 5.5V,
and is able to deliver up to 1A.
LX
4
VIN
VIN
3
4
SOT-23-5
W-DFN2020-6 (Type US)
Applications
The AP3417C is available in SOT-23-5 and W-DFN2020-6 (Type US)
packages.
Post DC-DC Voltage Regulation
PDA and Notebook Computer
Features
High Efficiency Buck Power Converter
Wide Input Voltage Range: 2.5V to 5.5V
Adjustable Output Voltage: 0.6V to 0.9×V
IN
Low R
DS(ON)
Internal Switches: 200m (V
IN
= 5V)
Built-in Power Switches for Synchronous Rectification with High
Efficiency
Output Current: 1.0A
Feedback Voltage: 600mV
1.5MHz Constant Frequency Operation
Thermal Shutdown Protection
Low Dropout Operation at 100% Duty Cycle
No Schottky Diode Required
Input Over Voltage Protection
Output Over Voltage Protection
Over Current Protection
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.
AP3417C
Document number: DS36516 Rev. 2 - 2
1 of 12
www.diodes.com
May 2016
© Diodes Incorporated
AP3417C
Functional Block Diagram
EN
1(2)
VIN
4(3)
Saw-tooth
Generator
Oscillator
Over - Current
Comparator
NEW PRODUCT
Bias
Generator
+
Current
Sensing
Soft
Start
FB
5(6)
-
+
Error
Amplifier
+
-
Modulator
Control
Logic
Buffer &
Dead Time
Control
Logic
3(4)
LX
-
+
Reverse Inductor
Current Comparator
IOVP Comparator
-
+
Over Voltage
Comparator
Bandgap
Reference
-
+
2(5)
A(B)
A for SOT-23-5
B for W-DFN2020-6 (Type US)
GND
Absolute Maximum Ratings
(Note 4)
Symbol
V
IN
V
EN
I
LX
P
D
Enable Input Voltage
LX Pin Switch Current
Power Dissipation (On PCB, T
A
= +25°
C)
SOT-23-5
W-DFN2020-6
(Type US)
SOT-23-5
W-DFN2020-6
(Type US)
SOT-23-5
W-DFN2020-6
(Type US)
+155
-55 to +150
-40 to +85
200
2000
Parameter
Input Voltage for the MOSFET Switch
Rating
0 to 6.0
-0.3 to V
IN
+0.3
1.8
0.4
1.89
250
53
130
25
°
C/W
°
C
°
C
°
C
V
V
°
C/W
W
Unit
V
V
A
θ
JA
Thermal Resistance (Junction to Ambient, Simulation)
θ
JC
T
J
T
STG
T
OP
V
MM
V
HBM
Note 4:
Thermal Resistance (Junction to Case, Simulation)
Operating Junction Temperature
Storage Temperature
Operating Temperature
ESD (Machine Model)
ESD (Human Body Model)
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.
AP3417C
Document number: DS36516 Rev. 2 - 2
3 of 12
www.diodes.com
May 2016
© Diodes Incorporated
AP3417C
Recommended Operating Conditions
Symbol
V
IN
T
A
T
J
Supply Input Voltage
Operating Ambient Temperature
Operating Junction Temperature
Parameter
Min
2.5
-40
-40
Max
5.5
+85
+125
Unit
V
º
C
º
C
NEW PRODUCT
Electrical Characteristics
otherwise specified.)
Symbol
V
IN
I
OFF
I
ON
V
FB
V
OUT
/V
OUT
I
PK
f
OSC
R
DS(ON)P
R
DS(ON)N
V
EN_H
V
EN_L
I
EN
t
SS
D
MAX
V
UVLO
T
SD
(@V
IN
= V
EN
= 5V, V
OUT
= 1.2V, V
FB
= 0.6V, L = 2.2µH, C
IN
= 4.7µF, C
OUT
= 10µF, T
A
= +25° unless
C,
Conditions
–
V
EN
= 0
V
FB
= 0.55V
–
V
IN
= 2.5V to 5.5V,
I
OUT
= 0 to 1.0A
–
V
IN
= 2.5V to 5.5V
V
IN
= 5V
V
IN
= 5V
–
–
–
–
–
Rising
Falling
Hysteresis
Hysteresis = +30°
C
Min
2.5
–
–
0.588
-3
1.5
1.2
–
–
1.5
–
–
–
100
–
–
–
–
Typ
–
–
220
0.6
–
1.9
1.5
200
200
–
–
–
400
–
2.3
2.1
0.2
+155
Max
5.5
0.1
–
0.612
3
–
1.8
–
–
–
0.4
0.1
–
–
–
–
–
+160
Unit
V
µA
µA
V
%
A
MHz
m
m
V
V
µA
µs
%
V
°
C
Parameters
Input Voltage Range
Shutdown Current
Active Current
Regulated Feedback Voltage
Regulated Output Voltage
Accuracy
Peak Inductor Current
Oscillator Frequency
PMOSFET R
DS(ON)
NMOSFET R
DS(ON)
EN High Level Input Voltage
EN Low Level Input Voltage
EN Input Current
Soft Start Time
Maximum Duty Cycle
Under Voltage Lock Out
Threshold
Thermal Shutdown
AP3417C
Document number: DS36516 Rev. 2 - 2
4 of 12
www.diodes.com
May 2016
© Diodes Incorporated
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