A
A
f
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.
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
and is able to deliver up to 1A. It is also available in fixed voltage
versions of 1.2V, 1.8V and 3.3V without external feedback resistance.
The AP3417C is available in SOT-23-5 and DFN-2×2-6 packages.
PRELIMINARY DATASHEET
Features
High Efficiency Buck Power Converter
Wide Input Voltage Range: 2.5V to 5.5V
Adjustable Output Voltage: 0.6V to 0.9×V
Low R
Built-in Power Switches for Synchronous Rectification with High
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
DS(ON)
Efficiency
when input voltage range is from 2.5V to 5.5V,
IN
IN
Internal Switches:200m (V
= 5V)
IN
Product Line o
Diodes Incorporated
P3417C
1.5MHZ SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Pin Assignments
K Package DN Package
(SOT-23-5) (DFN-2×2-6)
EN
1
GND
2
34
LX
FB
5
VIN
Applications
Post DC-DC Voltage Regulation
PDA and Notebook Computer
Typical Applications Circuit
AP3417C
Document number: DS36516 Rev. 1 - 0
For ADJ Version
1 of 11
www.diodes.com
September 2013
© Diodes Incorporated
A
A
f
Typical Applications Circuit (cont.)
V
(V)
OUT
PRELIMINARY DATASHEET
3.3 450 100 2.2
2.5 320 100 2.2
1.8 200 100 2.2
1.2 100 100 2.2
1.0 66 100 2.2
Product Line o
Diodes Incorporated
AP3417C
For Fixed Versions
Component Guide
R1 (kΩ) R2 (kΩ) L (µH)
P3417C
Pin Descriptions
Pin Number
SOT-23-5 DFN-2×2-6
1 2 EN Chip enable pin. Active high
2 5 GND Ground pin
3 4 LX Switch output pin
4 3 VIN Power supply
5 6 FB Feedback voltage of output
1 NC No internal connection
Pin Name Function
AP3417C
Document number: DS36516 Rev. 1 - 0
2 of 11
www.diodes.com
September 2013
© Diodes Incorporated
A
A
f
Functional Block Diagram
EN
Product Line o
Diodes Incorporated
P3417C
VIN
1(2)
Generator
Bias
Generator
Soft
Start
FB
5(6)
PRELIMINARY DATASHEET
Bandgap
Reference
A(B)
A for SOT-23-5
B for DFN-2×2-6
Absolute Maximum Ratings (Note 1)
Saw-tooth
-
+
Amplifier
-
+
+
Error
Over Voltage
Oscillator
+
-
Modulator
Comparator
Over -Current
Comparator
Control
Logic
Reverse Inductor
Current Comparator
IOVP Comparator
Current
Sensing
Buffer &
Dead Time
Control
Logic
4(3)
3(4)
LX
-
+
-
+
2(5)
GND
Symbol Parameter Rating Unit
VIN
VEN
ILX
PD Power Dissipation (On PCB, TA = +25°C)
θJA
θJC
TJ
T
STG
TOP
VMM
V
HBM
Note: 1. 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.
Input Voltage for the MOSFET Switch 0 to 6.0 V
Enable Input Voltage
LX Pin Switch Current 1.8 A
Thermal Resistance (Junction to Ambient, Simulation)
Thermal Resistance (Junction to Case, Simulation) SOT-23-5 130 °C/W
Operating Junction Temperature 155
Storage Temperature -55 to +150
Operating Temperature -40 to +85
ESD (Machine Model) 200 V
ESD (Human Body Model) 2000 V
-0.3 to V
SOT-23-5 0.4
DFN-2×2-6 1.89
SOT-23-5 250
DFN-2×2-6 53
IN
+0.3
V
W
°C/W
°C
°C
°C
AP3417C
Document number: DS36516 Rev. 1 - 0
3 of 11
www.diodes.com
September 2013
© Diodes Incorporated
A
A
f
Recommended Operating Conditions
Symbol Parameter Min Max Unit
VIN
TA
TJ
Supply Input Voltage 2.5 5.5 V
Operating Ambient Temperature -40 85 ºC
Operating Junction Temperature -40 125 ºC
Electrical Characteristics (@V
otherwise specified.)
Symbol Parameters Conditions Min Typ Max Unit
VIN
I
OFF
ION
VFB
Input Voltage Range 2.5 5.5 V
Shutdown Current
Active Current
Regulated Feedback Voltage
= V
IN
PRELIMINARY DATASHEET
V
OUT
V
OUT/VOUT
R
DS(ON)P
R
DS(ON)N
V
V
D
V
IPK
f
OSC
PMOSFET R
NMOSFET R
EN_H
EN_L
IEN
tSS
MAX
UVLO
TSD
AP3417C
Document number: DS36516 Rev. 1 - 0
Output Voltage
Regulated Output Voltage
Accuracy
Peak Inductor Current 1.5 1.9 A
Oscillator Frequency
DS(ON)
DS(ON)
EN High Level Input Voltage 1.5 V
EN Low Level Input Voltage 0.4 V
EN Input Current 0.1 µA
Soft Start Time 400 µs
Maximum Duty Cycle 100 %
Under Voltage Lock Out
Threshold
Thermal Shutdown Hysteresis = 30°C 155 160 °C
= 5V, V
EN
V
V
= 1.2V, V
OUT
V
EN
V
FB
For Adjustable Output
Voltage
Fixed Output 1.2V 1.176 1.2 1.224
Fixed Output 1.8V 1.764 1.8 1.836
Fixed Output 3.3V 3.234 3.3 3.366
V
IN
I
OUT
V
IN
IN
IN
Rising 2.3
Falling 2.1
Hysteresis 0.2
FB
= 0
= 0.55V
= 2.5V to 5.5V,
= 0 to 1.0A
= 2.5V to 5.5V
= 5V
= 5V
4 of 11
www.diodes.com
Diodes Incorporated
= 0.6V, L = 2.2µH, C
0.588 0.6 0.612 V
Product Line o
P3417C
= 4.7µF, C
IN
0.1 µA
220 µA
-3 3 %
1.2 1.5 1.8 MHz
200
200
= 10µF, TA = +25°C, unless
OUT
September 2013
© Diodes Incorporated
V
m
m
V
A
A
f
Performance Characteristics (@V
Efficiency vs. Output Current Regulated Feedback Voltage vs. Temperature
100
95
90
85
80
75
70
65
60
Efficiency (%)
55
50
45
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2
PRELIMINARY DATASHEET
Output Ripple (I
Output Current (A)
OUT
VIN=5.0V
=0A) Output Ripple (I
V
10mV/div
OUT_AC
V
SW
2V/div
500mA/div
IL
Time 800µs/div
Enable Turn On (I
=1A) Enable Turn Off (I
OUT
VEN
5V/div
V
SW
5V/div
V
OUT
1V/div
500mA/div
IL
Time 200µs/div
Diodes Incorporated
= 5V, TA = +25°C, unless otherwise specified.)
IN
0.70
0.68
0.66
0.64
0.62
V
=1.0V
OUT
V
=1.2V
OUT
V
=1.8V
OUT
V
=2.5V
OUT
V
=3.3V
OUT
10mV/div
500mA/div
V
OUT_AC
VSW
2V/div
1A/div
VEN
5V/div
V
5V/div
V
OUT
1V/div
0.60
0.58
0.56
0.54
Regulated Feedback Voltage (V)
0.52
0.50
-40 -20 0 20 40 60 80 100 120 140
IL
SW
I
L
Product Line o
Temperature (oC)
Time 400ns/div
Time 800µs /div
OUT
OUT
P3417C
VIN=5.0V
=1A)
=1A)
AP3417C
Document number: DS36516 Rev. 1 - 0
5 of 11
www.diodes.com
September 2013
© Diodes Incorporated
A
A
f
Performance Characteristics (cont.) (@V
Short Circuit Protection (I
OUT
= 5V, TA = +25°C, unless otherwise specified.)
IN
=1A) Short Circuit Protection Recovery (I
V
OUT
1V/div
VSW
5V/div
I
L
2A/div
Time 200µs/div
Ordering Information
PRELIMINARY DATASHEET
For ADJ Version
AP3417C -
G1: Green
Circuit Type
For Fixed Versions
Package
K: SOT-23-5
-×-
AP3417C -
G1: Green
Circuit Type
Package
K: SOT-23-5
-×-
Package Temperature Range Part Number Marking ID Packing Type
AP3417CKTR-G1 G4I Tape & Reel
SOT-23-5 -40 to 85ºC
DFN-2×2-6 -40 to 85ºC
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
AP3417C
Document number: DS36516 Rev. 1 - 0
AP3417CK-1.2TRG1 G4U Tape & Reel
AP3417CK-1.8TRG1 G4V Tape & Reel
AP3417CK-3.3TRG1 G4W Tape & Reel
AP3417CDNTR-G1 BH Tape & Reel
AP3417CDN-1.2TRG1 BL Tape & Reel
AP3417CDN-1.8TRG1 BM Tape & Reel
AP3417CDN-3.3TRG1 BN Tape & Reel
6 of 11
www.diodes.com
V
OUT
1V/div
V
SW
5V/div
2A/div
I
L
Product Line o
Diodes Incorporated
Time 200µ s /div
TR: Tape & Reel
TR: Tape & Reel
1.2: Fixed Output 1.2V
1.8: Fixed Output 1.8V
3.3: Fixed Output 3.3V
P3417C
=1A)
OUT
September 2013
© Diodes Incorporated
A
A
f
Package Outline Dimensions (All dimensions in mm(inch).)
Product Line o
Diodes Incorporated
P3417C
2.820(0.111)
3.100(0.122)
)
)
8
4
1
0
1
1
.
.
0
0
(
(
0
0
0
5
0
PRELIMINARY DATASHEET
6
.
.
2
3
0.950(0.037)
P
Y
T
1.800(0.071)
2.000(0.079)
SOT-23-5
)
9
5
0
.
0
(
0
0
5
.
1
0.300(0.012)
0.500(0.020)
)
7
6
0
.
0
(
0
0
0.200(0.008)
7
.
1
0
7
.
0
0
R
0.100(0.004)
0.200(0.008)
)
)
2
4
1
2
0
0
.
.
0
0
(
(
0
0
0
0
6
3
.
.
0
0
8
2
0
.
0
(
)
F
E
0°
8°
)
7
5
0
.
X
0
A
(
0
M
5
4
.
1
AP3417C
Document number: DS36516 Rev. 1 - 0
7 of 11
www.diodes.com
0
0
0
.
0
0
5
1
.
0
0
0
9
.
0
3
.
1
3
0
.
0
(
0
0
5
0
.
0
(
)
0
0
0
.
0
(
)
6
0
0
.
0
(
)
5
)
1
September 2013
© Diodes Incorporated
A
A
f
Package Outline Dimensions (cont.) (All dimensions in mm(inch).)
DFN-2×2-6
Product Line o
Diodes Incorporated
P3417C
PRELIMINARY DATASHEET
AP3417C
Document number: DS36516 Rev. 1 - 0
8 of 11
www.diodes.com
September 2013
© Diodes Incorporated
A
A
f
Suggested Pad Layout
Product Line o
Diodes Incorporated
P3417C
SOT-23-5
PRELIMINARY DATASHEET
Y
Dimensions
Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 1.900/0.075
AP3417C
Document number: DS36516 Rev. 1 - 0
Z
(mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch)
E2
E1
9 of 11
www.diodes.com
X
G
E1
(mm)/(inch)
Z
(mm)/(inch)
E2
September 2013
© Diodes Incorporated
A
A
f
Suggested Pad Layout (cont.)
Product Line o
Diodes Incorporated
P3417C
PRELIMINARY DATASHEET
DFN-2×2-6
Dimensions
Value 2.400/0.094 0.300/0.012 0.500/0.020 1.600/0.063 1.000/0.039
Y
(mm)/(inch)
X1
(mm)/(inch)
Y1=E
(mm)/(inch)
X2
(mm)/(inch)
Y2
(mm)/(inch)
AP3417C
Document number: DS36516 Rev. 1 - 0
10 of 11
www.diodes.com
September 2013
© Diodes Incorporated
A
A
f
Product Line o
Diodes Incorporated
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
PRELIMINARY DATASHEET
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2013, Diodes Incorporated
www.diodes.com
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
IMPORTANT NOTICE
LIFE SUPPORT
P3417C
AP3417C
Document number: DS36516 Rev. 1 - 0
11 of 11
www.diodes.com
September 2013
© Diodes Incorporated
Loading...