AP3441SHE-7B [DIODES]
STEP-DOWN DC-DC BUCK CONVERTER;型号: | AP3441SHE-7B |
厂家: | DIODES INCORPORATED |
描述: | STEP-DOWN DC-DC BUCK CONVERTER |
文件: | 总15页 (文件大小:958K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AP3441/L
1MHZ, 3A STEP-DOWN DC-DC BUCK CONVERTER
Pin Assignments
Description
The AP3441 and AP3441L is a 3A 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)
Pin1 Mark
The AP3441/L 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 AP3441/L 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.
FB
1
8
7
6
5
SGND
EN
2
PG
VIN
3
4
LX
The AP3441/L delivers 3A maximum output current while consuming
only 55μA of no-load quiescent current. Ultra-low RDS(ON) integrated
MOSFETs and 100% duty cycle operation make the AP3441/L an
ideal choice for high output voltage, high current applications which
require a low dropout threshold. Pulse skip mode to maintain high
efficiency at light-load conditions.
PGND
NC
W-DFN2020-8 (Type C)
The AP3441/L is available in W-DFN2020-8 (Type C) package.
Features
Applications
Input Voltage: 2.7V to 5.5V
Post DC-DC Voltage Regulation
Output Voltage: 0.6V to VIN
Set Top Boxes
Notebook Computer
PAD
0.6V Reference Voltage with ±1.5% Precision
55µA (Typ) No Load Quiescent Current
Shutdown Current: <1µA
100% Duty Cycle Operation
1MHz Switching Frequency
No External Compensation Required
Short Circuit Protection
441L: Latch Off Protection
AP3441: Hiccup Mode Protection
Over Voltage Protection
AP3441L: Latch Off Protection
AP3441: Non Latch Off Protection
Thermal Shutdown
W-DFN2020-8 (Type C) 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) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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
AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Typical Applications Circuit
L1 2.2mH
VOUT=1.8V
VIN=2.7V to 5.5V
VIN
LX
R1
C1
22pF
COUT
22mFx2
CIN
22mF
200kΩ
OFF ON
FB
EN
PG
R2
100kΩ
PGND
SGND
Pin Descriptions
Pin Number
Pin Name
Function
1
FB
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
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.
2
PG
3
4
5
6
VIN
PGND
NC
Bias supply. Chip main power supply pin
Power ground pin
No connection
LX
The drains of the internal main and synchronous power MOSFET.
Enable control input. Force this pin voltage above 1.5V enables the chip, and below 0.4V
shuts down the device.
7
8
EN
SGND
Signal ground pin
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Functional Block Diagram
VIN
EN
7
3
Slope
Compensation
OCP
Comparator
Oscillator
UVLO
Current
Shutdown
Sensing
Comparator
Buffer &
Dead Time
Control
2
Bias
Generator
PG
Control
Logic
6
Logic
LX
PWM
Comparator
Soft
Start
1
Reverse Inductor
Current Comparator
FB
Error
Amplifier
4
8
PGND
SGND
AP3441L only
VIN OVP Comparator
SCP
OVP
Latch off
Circuit
Bandgap
Reference
Functional Block Diagram of AP3441/L
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Absolute Maximum Ratings (Note 4)
Symbol
VIN
Parameter
Rating
-0.3 to 6
Unit
V
Input Voltage
VEN
VFB
VLX
EN Pin Voltage
-0.3 to VIN+0.3
-0.3 to VIN+0.3
-0.3 to VIN+0.3
-3 to VIN +3 for <20nS
-0.3 to VIN+0.3
1.4
V
FB Pin Voltage
V
LX Pin Voltage
V
VLX
LX Pin Voltage
V
VFB
PD
Feedback Pin Voltage
Power Dissipation (On PCB, TA = +25°C)
V
W
θJA
Thermal Resistance (Junction to Ambient)
70
°C/W
θJC
Thermal Resistance (Junction to Case, Simulation)
Operating Junction Temperature
8.2
+150
°C/W
°C
°C
V
TJ
TSTG
VHBM
VCDM
Storage Temperature
-55 to +150
2000
ESD (Human Body Model, JESD22-A114)
ESD (Charge Device Mode, JESD22-C101)
1000
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” are not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
VIN
Parameter
Min
2.7
-40
-40
Max
5.5
Unit
V
Supply Voltage
TJ
Junction Temperature Range
Operating Ambient Temperature
+125
+85
°C
°C
TA
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© Diodes Incorporated
AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Electrical Characteristics (@TA = +25ºC , VIN = 5.0V, VOUT = 2.5V, COUT = 22µF*2, L = 2.2µH, unless otherwise specified.)
Symbol
Parameters
Conditions
Min
Typ
Max
Unit
VIN
VIN
VOUT
IQ
Input Voltage Range
Output Voltage Range
Quiescent Current
–
–
2.7
0.6
–
–
5.5
VIN
–
V
V
–
VFB = 0.65V
VEN = 0V
VIN Rises
VIN Falls
55
0.1
2.4
0.2
µA
µA
V
ISD
Shutdown Current
–
1
VUVLO
VHYS
Input UVLO Threshold
Input UVLO Hysteresis
–
2.5
–
–
V
Feedback Input
VFB
Regulated Feedback Voltage
FB Leakage Current
–
0.591
–
0.6
–
0.609
0.2
–
V
µA
A
IFB
VFB = 1V
ILIM
Peak Inductor Current
–
3.5
–
Oscillator
fOSC
Oscillator Frequency
Maximum Duty Cycle
–
–
0.8
1
1.2
MHz
%
DMAX
100
–
–
MOSFET
ILX = 100mA High Side
ILX = 100mA Low Side
–
–
72
53
–
–
mΩ
mΩ
Drain-Source On-State
Resistance
RDS(ON)
Output Discharge Switch On
Resister
RDISCH
–
–
50
–
Ω
EN Pin
VENH
EN Threshold High
EN Threshold Low
EN Leakage Current
–
1.5
–
–
–
–
–
V
V
VENL
–
0.4
1.0
IEN
VIN= VEN =5V
-1.0
µA
Protection
Short Circuit Protection Latch
Off Threshold
VSCP
AP3441L only
–
–
0.42
30
–
–
V
Short Circuit Protection Delay
Time
tDELAY_SCP
–
ms
TOTP
TDTH
Over Temperature Protection
OTP Hysteresis
–
–
–
–
–
–
+150
+20
0.72
6.3
–
–
–
–
–
°C
°C
V
–
VOVP
Vout Over Voltage Protection
VIN Over Voltage Protection
IOVP Hysteresis
AP3441L only
VIN Rises
VIN Falls
VIOVP
V
VIHSY
0.35
V
Soft Start
tSS
Soft-start Time
–
0.7
1.0
1.3
ms
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Typical Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.)
Efficiency vs. Load Current
Output Voltage vs. Output Current
1.814
1.812
1.810
1.808
1.806
1.804
1.802
1.800
1.798
1.796
1.794
1.792
1.790
100
95
90
85
80
75
70
65
60
VIN=5V, VOUT=1.0V
VIN=5V, VOUT=1.8V
VIN=5V, VOUT=3.3V
VIN=5.0V VO=1.8V
0
500
1000
1500
2000
2500
3000
10
100
1000
Ouput Current (mA)
Output Current (mA)
Output Voltage vs. Input Voltage
Feedback Reference Voltage vs. Temperature
0.604
0.603
0.602
0.601
0.600
0.599
0.598
0.597
0.596
0.595
0.594
1.812
1.810
1.808
1.806
1.804
1.802
1.800
1.798
VO=1.8V IO=3A
-60
-40
-20
0
20
40
60
80
100
120
140
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Temperature (℃)
Input Voltage (V)
PFET Drain-Source On-State Resistance vs. Temperature
NFET Drain-Source On-State Resistance vs. Temperature
75
70
65
60
55
50
45
40
35
30
25
95
90
85
80
75
70
65
60
55
50
45
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature(℃)
Temperature (℃)
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Typical Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.)
Inductor Current Limit vs. Temperature Oscillation Frequency vs. Temperature
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
3.8
1200
1150
1100
1050
1000
950
900
850
800
750
700
-60
-60
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Temperature (℃)
Temperature (℃)
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Typical Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.)
Enable Turn on Characteristic (IOUT=3A) Enable Turn off Characteristic (IOUT=3A)
VEN
VEN
(5V/div)
(5V/div)
VOUT
VOUT
(1V/div)
(1V/div)
VPG
VPG
(5V/div)
(5V/div)
IL
IL
(2A/div)
(2A/div)
Output Ripple (IOUT=0A)
Output Ripple (IOUT=3A)
Load Transient (IOUT=2A to 3A)
SCP Recovery (IOUT=3A) for AP3441
VOUT_AC
(20mV/div)
VOUT_AC
(20mV/div)
VSW
(5V/div)
VSW
(5V/div)
IL
(2A/div)
IL
(2A/div)
Load Transient (IOUT=0.5A to 3A)
VOUT_AC
(20mV/div)
VOUT_AC
(20mV/div)
IL
IL
(2A/div)
(2A/div)
Short Current Protection (IOUT=3A) for AP3441
VOUT
(5V/div)
VOUT
(5V/div)
VPG
(5V/div)
VPG
(5V/div)
VSW
(1V/div)
VSW
(1V/div)
IL
IL
(5A/div)
(5A/div)
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© Diodes Incorporated
AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Application Information
The AP3441/L is a 3A current mode control, synchronous buck regulator with integrated power MOSFETs. Current mode control assures excellent
line regulation, load regulation, and a wide loop bandwidth for fast response to load transients. See the typical application schematic and
functional block diagram of AP3441/L for more details. The buck controller drives the internal high side P-FETs. The buck regulator can operate
from an unregulated DC source, such as a battery, with a voltage ranging from 2.7V to 5.5V. The converter output can be regulated as low as 0.6V
to as high as VIN. The feedback loop is compensated internally.
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 AP3441/L output node is shorted to GND that VFB drops under 0.42V, AP3441 will enter hiccup mode to protect itself and AP3441L will
enter latch-off mode. If short condition is removed, and VFB rises over 0.42V, the AP3441 recovers to normal operation again. AP3441L will remain
in this state until VIN or EN voltage is recycled. If the AP3441/L reaches OCP threshold while short circuit, the AP3441 will enter cycle by cycle
current limit mode until the current under OCP threshold.
Over Voltage Protection (AP3441L Only)
The AP3441L has internal output OVP circuits. When VOUT is exceeds 120% of the regulation level for more than 40µs, the power switches will
be turned off. AP3441L enters latch off mode and will restart until VIN or Enable voltage recycled.
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 +150°C , it shuts down the internal control circuit and switching power MOSFET.
The AP3441/L will restart automatically under the control of soft start circuit when the junction temperature decreases to +130°C .
Setting the Output Voltage
Choose R1 and R2 to program the proper output voltage. 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. Table 1 shows a list of resistors selection for common output voltages. An optional C1 of
10pF to 470pF used to boost the phase margin and improve stability. R2 in figure 6 can be determined by the following equation:
R1 0.6
R2
VOUT 0.6
C1 (pF)
L1 (µH)
R1 (kΩ)
R2 (kΩ)
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
VOUT (V)
1.0V
L1
C1
LX
FB
68kΩ
100kΩ
150kΩ
200kΩ
317kΩ
367kΩ
22pF
22pF
22pF
22pF
22pF
22pF
1.0µH
1.0µH
1.2V
R1
R2
1.5V
1.5 – 2.2µH
1.5 – 2.2µH
2.2µH
1.8V
2.5V
2.2µH
2.8V
Figure 1. Feedback Divider Network
Table 1. Recommended Component Selection
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Application Information
Input Capacitor
The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input capacitor has to
sustain the ripple current produced during the on time on the upper MOSFET. It must hence have a low ESR to minimize the losses.
The RMS current rating of the input capacitor is a critical parameter that must be higher than the RMS input current. As a rule of thumb, select an
input capacitor which has RMs rating that is greater than half of the maximum load current.
Due to large di/dt through the input capacitors, electrolytic or ceramics should be used. If a tantalum must be used, it must be surge protected.
Otherwise, capacitor failure could occur. For most applications, a 22µF ceramic capacitor is sufficient.
Output Capacitor
The output capacitor keeps the output voltage ripple small, ensures feedback loop stability and reduces the overshoot of the output voltage. The
output capacitor is a basic component for the fast response of the power supply. In fact, during load transient, for the first few microseconds it
supplies the current to the load. The converter recognizes the load transient and sets the duty cycle to maximum, but the current slope is limited
by the inductor value.
ESR of the output capacitor dominates the output voltage ripple. The amount of ripple can be calculated from the equation below:
VOUTCAPACITOR ΔIINDUCTOR *ESR
An output capacitor with ample capacitance and low ESR is the best option. For most applications, 2x22µF ceramic capacitor will be sufficient.
ΔI
2
INDUCTOR
L(IOUT
)
2
CO
2
(Δ V VOUT )2 VOUT
Where ΔV is the maximum output voltage overshoot.
Inductor Selection
The inductor is used to supply smooth current to output when it is driven by a switching voltage. Its value is determined based on the operating
frequency, load current, ripple current, and duty cycle. For most application, the value of the inductor will fall in the range of 1.0mH to 2.2mH.
Choose an inductor that has small DC resistance, has enough current rating and is hard to cause magnetic saturation.
Vo
L(mH)
1.0µH
1.0µH
1.5 – 2.2µH
1.5 – 2.2µH
2.2µH
1.0V
1.2V
1.5V
1.8V
2.5V
2.8V
3.3V
2.2µH
2.2µH
Table 2: Recommended Inductor Selection Table
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Ordering Information
AP3441 X X – X
Packing
Version
Package
Blank : AP3441
L : AP3441L
-7B : Tape & Reel
SHE : W-DFN2020-8
(Type C)
Package
Temperature Range
-40 to +85°C
Part Number
AP3441SHE-7B
AP3441LSHE-7B
Marking ID
Packing
-7B
W-DFN2020-8 (Type C)
W-DFN2020-8 (Type C)
9B
9C
-40 to +85°C
-7B
Marking Information
(1) W-DFN2020-8 (Type C)
( Top View )
XX : Identification Code
Y : Year : 0~9
XX
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
Y W X
X : Internal Code
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
(1) Package Type: W-DFN2020-8 (Type C)
A1
A
W-DFN2020-8
(Type C)
A3
Seating Plane
Dim Min
Max Typ
*D
A
A1
A3
b
D
D2
E
0.770 0.830 0.800
0
-
0.20 0.30 0.25
1.950 2.075 2.000
1.50 1.70 1.60
1.950 2.075 2.000
0.80 1.00 0.90
D2
0.05 0.02
0.152
D2/2
-
K
Pin #1 ID
E2/2
E2
e
E
E2
-
-
-
-
0.50
0.1 5
K
L
0.240 0.340 0.290
All Dimensions in mm
L
b
e
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
(1) Package Type: W-DFN2020-8 (Type C)
X2
Y
G
Dimensions Value (in mm)
C
G
G1
X
X1
X2
Y
Y1
Y2
0.500
0.200
0.210
0.300
1.600
1.750
0.490
0.900
2.300
G1
Y2 Y1
X1
X
C
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Taping & Reel Specification
8 mm
Package
Suffix
Tape Orientation
W-DFN2020-8 (Type
C)
-7B
See Note 5
See Note 5
See Note 5
EMBOSSED TAPE DIMENSIONS in mm
Tape Width
D
E
Po
t max
Ao Bo Ko
-
1.50
+0.10
–0.0
1.75
8mm
4.0± 0.10
0.400
Note 5
Constant Dimensions
±0.10
EMBOSSED TAPE DIMENSIONS in mm
B1
max
4.5
W
Tape Width
D1 min
F
K max
P2
R min
8mm
1.0
3.5± 0.05
2.4
2.0± 0.05
25
8.0± 0.30
Note: 5. Ao, Bo and Ko are determined by component size.
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
Taping & Reel Specification (Cont.)
Surface Mount Reel Specifications (All Dimensions in mm)
Tape Size
A Max
B* Max
2.0 +0.5
-0
C
D* Max
N Min
G
T Max
13 +0.5
-0.2
8.4 +1.5
-0
330±2
20.5±0.2
100±2
14.4
8mm
2.0 +0.5
-0
13 +0.5
-0.2
8.4 +1.5
-0
178±2
20.5±0.2
55±5
14.4
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AP3441/L
Document number: DS39754 Rev. 1 - 2
AP3441/L
IMPORTANT NOTICE
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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 © 2018, Diodes Incorporated
www.diodes.com
15 of 15
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March 2018
© Diodes Incorporated
AP3441/L
Document number: DS39754 Rev. 1 - 2
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