AP3401 [DIODES]
1.5MHZ, 1A STEP-DOWN DC - DC BUCK CONVERTER;
| 型号： | AP3401 |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | 1.5MHZ, 1A STEP-DOWN DC - DC BUCK CONVERTER |
| 文件： | 总11页 (文件大小：933K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP3401
1.5MHZ, 1A STEP-DOWN DC - DC BUCK CONVERTER
Description
Pin Assignments
The AP3401 is a 1A 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.
(Top View)
Pin 1 Mark
The AP3401 supports a range of input voltages from 2.5V 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 AP3401 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.
6
5
4
FB
1
2
3
EN
PG
GND
LX
VIN
TSOT26
(Top View)
Pin 1 Mark
The AP3401 delivers 1A maximum output current while consuming
only 40μA of no-load quiescent current. Ultra-low RDS(ON) integrated
MOSFETs and 100% duty cycle operation make the AP3401 an ideal
choice for high output voltage, high current applications which require
1
6
5
4
EN
FB
2
3
GND
LX
a
low dropout threshold. Pulse skip mode allows to maintain high
PG
efficiency at light-load conditions.
VIN
The AP3401 is available in TSOT26, U-DFN2020-6 (Type J)
packages.
U-DFN2020-6 (Type J)
Features
Output Current: Up to 1A
Applications
Output Voltage: 0.6V to VIN
Post DC-DC Voltage Regulation
Input Voltage: 2.5V to 5.5V
Set Top Boxes
0.6V Reference Voltage With ±2% Precision
40µA (Typ) No Load Quiescent Current
Shutdown Current: <1µA
Notebook Computer
PAD
100% Duty Cycle Operation
1.5MHz Switching Frequency
Internal Soft Start
No External Compensation Required
Current Limit Protection
Thermal Shutdown
TSOT26, U-DFN2020-6 (Type J) Packages
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.
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© Diodes Incorporated
AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Typical Applications Circuit
V =2.5V to 5.5V
IN
ON OFF
VIN
PG
EN
LX
CIN
10mF
100k
L1 2.2
C1
mH
=1.8V
VOUT
R1
COUT
10mF
22pF
300k
FB
GND
R2
150k
Pin Descriptions
Pin Number
Pin Name
Function
U-DFN2020-6
TSOT26
(Type J)
Enable control input. Force this pin voltage above 1.5V enables the chip, and
below 0.4V shuts down the device
1
1
EN
2
3
4
5
4
3
GND
LX
Ground pin
The drains of the internal main and synchronous power MOSFET
Bias supply. Chip main power supply pin
VIN
Power good indicator, open drain output. PG is pulled up to VIN when the
output voltage is within 20% of the regulation level, otherwise it is low
5
6
2
6
PG
FB
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Functional Block Diagram
4(3)
VIN
1.5M OSC
+
SLOPE COMP
PWM
COMP
+
+
_
6(6)
FB
IAMP
_
____
OSC
FREQ
SHIFT
Q
S
R
SWITCHING
_
3(4)
LOGIC AND
BLOCKING
CIRCUIT
_
Q
LX
ANTI -
SHOOT
THRU
0.6V REF
1(1)
+
+
EA
EN
CONTROL
5(2)
LOGIC
PG
2(5)
SHUTDOWN
GND
A(B)
A for TSOT26
B for U-DFN2020-6
Absolute Maximum Ratings (Note 4)
Symbol
VIN
Parameter
Rating
Unit
V
Input Voltage
-0.3 to 6
VEN
EN Pin Voltage
LX Pin Voltage
Feedback Pin Voltage
-0.3 to VIN+0.3
-0.3 to VIN+0.3
-0.3 to VIN+0.3
V
VLX
V
VFB
V
TSOT26
0.4
PD
θJA
θJC
Power Dissipation (on PCB, TA = +25°C)
W
U-DFN2020-6 (Type J)
TSOT26
1.89
220
53
Thermal Resistance (Junction to Ambient)
°C/W
ºC/W
U-DFN2020-6 (Type J)
TSOT26
130
25
Thermal Resistance (Junction to Case,
Simulation)
U-DFN2020-6 (Type J)
+155
TJ
Operating Junction Temperature
Storage Temperature
°C
°C
V
TSTG
VMM
VHBM
VCDM
-55 to +150
ESD (Machine Model)
200
2000
1000
ESD (Human Body Model)
ESD (Charge Device Mode)
V
V
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.
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© Diodes Incorporated
AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Recommended Operating Conditions
Symbol
VIN
Parameter
Min
2.5
-40
-40
Max
5.5
Unit
V
Input Voltage Range
TA
Operating Ambient Temperature
Junction Temperature Range
+85
+125
°C
°C
TJ
Electrical Characteristics (@VIN = 5V, VOUT = 1.2V, L = 2.2µH, CIN = COUT = 10µF, TA = +25°C, unless otherwise specified.)
Symbol
VIN
Parameter
Input Voltage Range
Regulated Feedback Voltage
FB Leakage Current
Quiescent Current
Condition
Min
2.5
0.588
–
Typ
–
Max
5.5
0.612
0.2
–
Unit
V
–
VFB
IFB
–
0.6
–
V
VFB = 1V
μA
μA
μA
A
IQ
VFB = 0.65V
–
40
0.1
–
ISD
Shutdown Current
VEN = 0V
–
1
ILIM
Peak Inductor Current
Oscillator Frequency
–
1.3
–
–
fOSC
–
1.5
250
170
–
–
MHz
ILX = 100mA, high side
–
–
Drain to Source On-state
Resistance
RDS(ON)
mΩ
ILX = 100mA, low side
–
–
VENH
VENL
IEN
EN High Threshold
EN Low Threshold
EN Leakage Current
Input UVLO Threshold
UVLO Hysteresis
–
1.5
–
–
V
V
–
–
0.4
1.0
2.7
–
VIN = VEN = 5V
-1.0
–
–
μA
V
VUVLO
VHYS
–
–
–
–
2.4
0.1
–
–
V
Maximum Duty Cycle
100
–
%
Output Discharge Switch On
Resistance
RDSCH
–
–
2.1
–
KΩ
TOTP
TOTH
tSS
Over Temperature Protection
OTP Hysteresis
–
–
–
–
–
–
+160
+15
2
–
–
–
°C
°C
ms
Soft-start Time
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© Diodes Incorporated
AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.)
Efficiency vs. Load Current Feedback Reference Voltage vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
0.630
0.625
0.620
0.615
0.610
0.605
0.600
0.595
0.590
0.585
0.580
0.575
0.570
VIN=5V, VOUT=1.0V
VIN=5V, VOUT=1.8V
VIN=5V, VOUT=3.3V
10
100
1000
-60
-40
-20
0
20
40
60
80
100
120
140
Output Current(mA)
Temperature（oC）
PFET Drain-Source On-State Resistance vs. Temperature
NFET Drain-Source On-State Resistance vs. Temperature
240
220
200
180
160
140
120
100
80
260
240
220
200
180
160
140
120
100
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temperatrue（oC）
Temperature（oC）
Quiescent Current vs. Temperature
Oscillation Frequency vs. Temperature
100
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
90
80
70
60
50
40
30
20
10
0
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temperatrue（oC）
Temperature（oC）
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.)
Enable Turn on Characteristic (IOUT=1A) Enable Turn off Characteristic (IOUT=1A)
EN
(5V/div
EN
(5V/div)
VOUT
(1V/div)
VOUT
(1V/div)
IL
IL
(1A/div)
SW
(5V/div)
SW
(5V/div)
Time (2ms/div)
Time (2ms /div)
Short Current Protection (IOUT=1A)
SCP Recovery (IOUT=1A)
VOUT
(1V/div)
VOUT
(1V/div)
IL
IL
(1A/div)
(1A/div)
SW
(5V/div)
SW
(5V/div)
Time (2ms /div)
Time (2ms/div)
Load Transient (IOUT=0.1A to 1A)
Load Transient (IOUT=0.5A to 1A)
VOUT_AC
(100mV/div
)
VOUT_AC
(100mV/div)
IO
IO
(1A/div)
(1A/div)
Time (2ms/div)
Time (2ms /div)
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Application Information
Typical application circuit is shown in the application circuit and for the circuit parameters setting please refers to the following descriptions.
Under Voltage Lockout (UVLO) Circuit
When the VIN drops lower than the UVLO detector threshold, the UVLO circuit starts to operate, VREF stops, and high-side switch and low-side
switch built-in switch transistors turn “OFF”. As a result, VOUT drops according to the COUT capacitance value and the load. When the VIN is rising
higher than UVLO released voltage, the IC will restart the operation.
Short Circuit Protection and Recovery
When the AP3401 output node is shorted to GND that VFB drops under 0.42V, the AP3401 will enter hiccup mode to protect itself. If short circuit is
removed, and VFB rises over 0.42V, the AP3401 recovers to normal operation again. If the AP3401 reaches OCP threshold while short circuit, the
AP3401 will enter cycle by cycle current limit mode until the current under OCP threshold.
Power Good
The PG pin output is an open drain MOSFET. The output is pulled low when the FB voltage enters the fault condition by falling below 80%or rising
above 120% of the nominal internal reference voltage. When the FB voltage rises to the good condition above 90% or falls below 110% of the
internal voltage reference PG output MOSET is turned off. It is recommended using a pull-up to VIN.
Over Temperature Protection
The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction
temperature is exceeded. When the junction temperature exceeds +160°C, it shuts down the internal control circuit and switching power MOSFET.
The AP3401 will restart automatically under the control of soft start circuit when the junction temperature decreases to +145°C.
Input Over Voltage Protection
When input voltage of AP3401 is near 6.25V, the IC will enter Input-Over-Voltage-Protection. It would be shut down and there will be no output
voltage in this state. As the input voltage goes down below 6V, it will leave input OVP and recover the output voltage.
Setting the Output Voltage
The output voltage can be adjusted from 1 to 5V using an external resistor divider. Table 1 shows a list of resistor selections for common output
voltages. Resistor R1 is selected based on a design tradeoff between efficiency and output voltage accuracy. For high values of R1 there is less
current consumption in the feedback network. However the tradeoff is output voltage accuracy due to the bias current in the error amplifier. R1 can
be determined by the following equation. Meanwhile, the input capacitor should close to IC for preventing unexpected influences.
Out Voltage
1.0V
R1
91k
R2
120k
C1
22pf
22pf
22pf
22pf
22pf
22pf
22pf
1.2V
1.5V
1.8V
2.5V
2.8V
3.3V
100k 100k
150k 100k
300k 150k
380k 120k
440k 120k
430k 100k
LX
FB
C1
R1
R2
Figure 1. Feedback Divider Network
Table 1. Resistor Selection for Common Output
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Ordering Information
AP3401 X X – X
Product Name
Package
Packing
RoHS/Green
TR : Tape & Reel
G1 : Green
KT : TSOT26
DN : U-DFN2020-6
Package
Temperature Range
Part Number
Marking ID
Packing
TSOT26
AP3401KTTR-G1
AP3401DNTR-G1
L2G
3000/Tape & Reel
-40 to +85°C
U-DFN2020-6
(Type J)
CP
3000/Tape & Reel
Marking Information
(1) TSOT26
(Top View)
First Line: Logo and Marking ID
(2) U-DFN2020-6 (Type J)
(Top View)
First Line: Logo and Marking ID
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Package Outline Dimensions (All dimensions in mm.)
(1) Package Type: TSOT26
D
e1
01( 4x)
TSOT26
E1/2
Dim
A
Min
Max
Typ
1.00
E/2
A1
A2
D
E
E1
b
0.010 0.100
0.840 0.900
2.800 3.000 2.900
2.800 BSC
1.500 1.700 1.600
c
E1
E
Gauge Plane
Seating Plane
0
L
0.300 0.450
0.120 0.200
L2
c
e
e1
L
0.950 BSC
1.900 BSC
0.50
01( 4x)
e
b
A2
0.30
L2
θ
θ1
0.250 BSC
8°
A1
A
0°
4°
4°
12°
Seating Plane
All Dimensions in mm
(2) Package Type: U-DFN2020-6 (Type J)
A3
A1
A
Seating Plane
U-DFN2020-6
(Type J)
D
D2
Dim
A
A1
A3
b
D
D2
E
Min
0.50 0.60
0.00 0.05 0.03
-- -- 0.203
Max Typ
D2/2
--
0.20 0.30 0.25
1.95 2.075 2.00
1.45 1.65 1.55
1.95 2.075 2.00
0.76 0.96 0.86
0.65 BSC
E2/2
E2
E2
e
E
L
0.30 0.40 0.35
All Dimensions in mm
L
e
b
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
Suggested Pad Layout
(1) Package Type: TSOT26
C
Dimensions Value (in mm)
C
0.950
0.700
1.000
3.199
X
Y
Y1
Y1
Y
X
(2) Package Type: U-DFN2020-6 (Type J)
X1
C
G
Value
Dimensions
(in mm)
0.650
0.120
0.350
1.650
0.550
0.960
2.300
C
G
X
X1
Y
Y1
Y2
Y2 Y1
Y
X
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AP3401
Document number: DS37389 Rev. 2 - 2
AP3401
IMPORTANT NOTICE
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.
LIFE SUPPORT
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
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
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 © 2016, Diodes Incorporated
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AP3401
Document number: DS37389 Rev. 2 - 2
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