A7142M8VR [AITSEMI]
DC-DC CONVERTER/ BUCK (STEP-DOWN);
| 型号： | A7142M8VR |
| 厂家： | 
AiT Semiconductor |
| 描述： | DC-DC CONVERTER/ BUCK (STEP-DOWN) DC-DC转换器 |
| 文件： | 总10页 (文件大小：374K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
DESCRIPTION
FEATURES
The A7142 series of regulators are monolithic integrated
circuits that provide all the active functions for a
step-down (buck) switching regulator, capable of
driving 2A load with excellent line and load
regulation. These devices are available in fixed
output voltages of 5V and an adjustable output
versions.
5V and adjustable output versions
Adjustable version output voltage range, 1.23V
to 37V ± 3% max over line and load conditions
Guaranteed 2A output current
Wide input voltage range
Requires only 4 external components
150 kHz fixed frequency oscillator
Requiring a minimum number of external components,
these regulators are simple to use and include internal
frequency compensation, and a fixed-frequency
oscillator. The A7142 series operates at a switching
frequency of 150KHz thus allowing smaller sized filter
components than what would be needed with lower
frequency switching regulators.
TTL shutdown capability, low power standby mode
Uses readily available standard inductors
Thermal shutdown and current limit protection
Available in SOP8 and PSOP8 Packages
APPLICATION
Simple high-efficiency step-down (buck) regulator
On-card switching regulators
Some features include a guaranteed ±4% tolerance
on output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
frequency. External shutdown is included, featuring
typically 50μA standby current. The output switch
includes cycle-by-cycle current limiting, as well as
thermal shutdown for full protection under fault
conditions. The oscillator frequency reduces in the
event of an output short or an overload which causes
the regulated output voltage to drop approximately
40% from the nominal output voltage.
Positive to negative converter
ORDERING INFORMATION
Package Type
Part Number
A7142M8R-XX
A7142M8VR-XX
A7142MP8R-XX
A7142MP8VR-XX
SOP8
M8
PSOP8
Note
MP8
XX: Output Voltage;
50=5.0V; ADJ=Adjustable
V: Halogen free Package
R: Tape & Reel
The A7142 is available in SOP8 and PSOP8
packages.
AiT provides all RoHS products
Suffix “V” means Halogen free Package
TYPICAL APPLICATION
Fixed Output Voltage Versions
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 1 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
PIN DESCRIPTION
Top View
Symbol
Top View
Function
Pin #
1
VIN
VOUT
Input Voltage Pin
2
Output Voltage Pin
Feed Back
3
4
FB
ON/OFF
GND
Enable Pin
5,6,7,8
Ground Pin
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 2 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage
ON/OFF Pin Input Voltage
FB Pin Voltage
45V
-0.3V ≤ V ≤ +VIN
-0.3V ≤ V ≤ +VIN
-0.8V
Output Voltage to Ground
Power Dissipation
Internally Limited
-65 °C to +150 °C
150 °C
Storage Temperature Range
Maximum Junction Temperature
Minimum ESD Rating (C= 100pF, R = 1.5 kΩ)
2kV
Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and
operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Temperature Range
Max Supply Voltage
ILOAD
-40°C ≤ TJ ≤ +125 °C
40V
2A
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 3 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
ELECTRICAL CHARACTERISTICSNOTE1
VIN= 12V Unless otherwise specified
Parameter
Symbol
Conditions
Min.
Typ.
5.0
Max.
Unit
V
System Parameters (Test Circuit Figure 1)
7V ≤ VIN ≤ 40V,
4.800
4.750
5.200
5.250
(NOTE7) 5.0V
0.2A ≤ ILOAD ≤ 2A
VOUT
7V ≤ VIN ≤ 40V,
0.2A ≤ ILOAD ≤ 2A
VOUT programmed for 5V
VIN =12V, ILOAD =2A
VIN =12V, ILOAD =2A
VOUT programmed for 5V
1.193
1.180
1.267
1.280
(NOTE7) ADJ
1.230
V
Output Voltage
5.0V
ADJ
77
77
%
%
η
All Output Voltage Versions
Feedback Bias
Current
VOUT =5V (Adjustable
Version Only)
100
500
170
180
1.4
IFB
(NOTE7)
(NOTE7)
(NOTE7)
50
nA
130
120
Oscillator Frequency
FO
(NOTE6)
150
kHz
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
VSAT
DC
ICL
IOUT =2A (NOTE2)
(NOTE3)
1.2
98
V
%
A
1.6
93
2.5
2.3
4.6
5.2
Peak Current (NOTE2, 6) (NOTE7)
3.2
(NOTE4, 5):
Output = 0V
Output = -0.8V
(NOTE 4)
ON/OFF Pin = 5V
(OFF)
Output Leakage
Current
IOL
0.4
10
5
2
30
10
mA
Quiescent Current
Standby Quiescent
Current
IQ
mA
uA
ISTBY
60
200
ON/OFF Control
2.2
2.4
VIH
VIL
VOUT=0V
(NOTE7)
(NOTE7)
1.4
1.2
V
V
ON/OFF Pin Logic
Input Level
VOUT=Nominal Output
Voltage
ON/OFF Pin = 5V (OFF)
ON/OFF Pin = 0V (ON)
1.0
0.8
30
IIH
IIL
12
0
uA
uA
ON/OFF Pin Input
Current
10
NOTE1: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
NOTE2: Output pin sourcing current. No diode, inductor or capacitor connected to output.
NOTE3: Feedback pin removed from output and connected to 0V.
NOTE4: Feedback pin removed from output and connected to +12V for the adjustable and 5V, versions to force the output transistor OFF
NOTE5: VIN =40V.
NOTE6: The oscillator frequency reduces to approximately 36 kHz in the event of an output short or an overload which causes the
regulated output voltage to drop approximately 40% from the nominal output voltage. This self protections feature lowers the
average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
NOTE7: denotes the specifications which apply over full operating temperature range TJ = -40…+125°C.
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 4 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
TYPICAL PERFORMANCE CHARACTERISTICS ( Circuit of Figure 1)
Figure 1.
1.
Normalized Output Voltage
2.
Line Regulation
3.
Switch Saturation Voltage
4.
Efficiency
5.
Switching Waveforms ,VOUT =15V,
A: Output Pin Voltage, 50V/div,
B: Output Pin Current 2A/div,
C: Inductor Current 2A/div,
6.
Load Transient
D: Output Ripple Voltage 50mv/div
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 5 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
TEST CIRCUIT
1.
Fixed Output Voltage Versions
2.
Adjustable Output Voltage Version
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 6 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
BLOCK DIAGRAM
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 7 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
PACKAGE INFORMATION
Dimension in SOP8 (Unit: mm)
Symbol
Min
Max
A
A1
A2
b
1.350
0.100
1.350
0.330
0.170
4.700
3.800
5.800
1.750
0.250
1.550
0.510
0.250
5.100
4.000
6.200
c
D
E
E1
e
1.270(BSC)
L
0.400
0°
1.270
8°
θ
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 8 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
Dimension in PSOP8 Package (Unit: mm)
Symbol
Min
Max
A
A1
A2
b
1.350
0.050
1.350
0.330
0.170
4.700
3.202
3.800
5.800
2.313
1.750
0.150
1.550
0.510
0.250
5.100
3.402
4.000
6.200
2.513
c
D
D1
E
E1
E2
e
1.270(BSC)
L
0.400
0°
1.270
8°
θ
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 9 -
A7142
DC-DC CONVERTER/ BUCK (STEP-DOWN)
AiT Semiconductor Inc.
www.ait-ic.com
SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discontinue any integrated circuit product or service without notice, and advises its customers to obtain the
latest version of relevant information to verify, before placing orders, that the information being relied on is
current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to
be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT
products in such applications is understood to be fully at the risk of the customer. As used herein may involve
potential risks of death, personal injury, or servere property, or environmental damage. In order to minimize
risks associated with the customer's applications, the customer should provide adequate design and
operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT
warrants the performance of its products of the specifications applicable at the time of sale.
REV2.1
- JUN 2011 RELEASED, MAY 2016 UPDATED -
- 10 -
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