A7534 [AITSEMI]
DC-DC CONVERTER/BOOST CONVERTER;
| 型号： | A7534 |
| 厂家： | 
AiT Semiconductor |
| 描述： | DC-DC CONVERTER/BOOST CONVERTER DC-DC转换器 |
| 文件： | 总9页 (文件大小：430K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
DESCRIPTION
FEATURES
The A7534 is a step-up converter that provides a
boosted output voltage from a low voltage source.
Because of its proprietary design, it starts up at a
very low input voltage down to 0.9V, and only
consumes 15uA at standby, making it an ideal
choice for single cell alkaline/NiMH battery
operations.
Efficiency up to 94%@VIN=3.3V, VOUT=5.5V
Typical 15uA standby current
1MHz Switching Frequency allows small
inductor and output cap
Input boost-strapping allows using small or no
input cap
Low Vin Start-up Voltage down to 0.9V Ideal for
Single Alkaline Cell operations
A switching frequency of 1MHz minimizes solution
footprint by allowing the use of tiny, low profile
inductors and ceramic capacitors. The current
mode PWM design is internally compensated,
reducing external parts count.
Maximum Output Current up to 300mA
Low Noise PWM control
Internally Compensated Current Mode Control
Internal Synchronous Rectifier
Available in SOT-23 and SOT89-3 Packages
The A7534 is available in SOT-23 and SOT89-3
packages.
APPLICATION
One to Three Cell Battery Operated Devices
Medical Instruments
ORDERING INFORMATION
Bluetooth Headsets
Flash-Based MP3 Players
Noise Canceling Headphones
Package Type
SOT-23
Part Number
A7534E3R-XX
TYPICAL APPLICATION
E3
K3
A7534E3VR-XX
A7534K3R-XX
A7534K3VR-XX
SOT89-3
Note
XX: Output Voltage,
33=3.3V
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 1 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
PIN DESCRIPTION
Top View
Function
Top View
Pin #
Symbol
SOT-23
SOT-89-3
1
2
1
3
GND
SW
Ground
To connect inductor to VIN
Output voltage pin, with 10uF ceramic capacitor closely
connected to GND
3
2
OUT
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 2 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
ABSOLUTE MAXIMUM RATINGS
SW Voltage
-0.3V~6V
-0.3V~6V
125°C
OUT Voltage
TJ, Max Operating Junction Temperature
SOT-23
SOT-89-3
450mW
Maximum Power Dissipation
500mW
TA, Ambient Temperature
TS, Storage Temperature
Lead Temperature & Time
-40°C~85°C
-55°C~150°C
260°C, 10S
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.
ELECTRICAL CHARACTERISTICS
TA = 25°C
Parameter
Input Voltage Range
Startup Voltage
Conditions
Min.
0.9
Typ.
Max.
5.0
Unit
V
Symbol
VIN
VSTART
VHOLD
VOUT
IOUT = 1mA
0.9
0.5
V
Hold Voltage
IOUT = 50mA
0.7
5.5
V
Output Voltage Range
Output voltage accuracy
Line regulation
1.8
V
IOUT = 0mA
2.0
0.1
1.0
1.0
90
%
IOUT = 50mA
0.2
2.0
1.4
95
%/V
%
Load regulation
IOUT = 0~300mA
Switching Frequency
Max Duty cycle
FSOC
VOUT =0.95VO, No inductor
VOUT =0.95VO, No inductor
0.7
85
MHz
%
Quiescent Current at VOUT
Supply current at VIN
Efficiency
V
OUT =1.05*VO
5.0
8.0
15
μA
IQ
IOUT = 0mA
20
μA
IOUT = 100mA
85
%
PMOS RDSON
RDSON
P
N
ISW =100mA
400
200
600
300
1.0
mohm
mohm
μA
NMOS RDSON
RDSON
ISW =100mA
SW Leakage Current
ISWLK
VOUT =5.2V, VSW=0 or 5.2V
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 3 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
TYPICAL PERFORMANCE CHARACTERISTICS
Tested under CIN=COUT=10uF, L=2.2uH, TA=25°C, unless otherwise specified
1.
Efficiency vs. Output Current
2.
Efficiency vs. Output Current
(VOUT=5.5V)
(VOUT=3.3V)
3.
Efficiency vs. Output Current
(VOUT=3.0V)
4.
Efficiency vs. Output Current
(VOUT=1.8V)
5.
Output Voltage vs. Output Current
(VOUT=5.5V)
6.
Output Voltage vs. Output Current
(VOUT=3.3V)
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 4 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
7.
Output Voltage vs. Output Current
8.
Output Voltage vs. Output Current
(VOUT=1.8V)
(VOUT=3.0V)
9.
IQ vs. Temperature
10. Output Voltage vs. Temperature
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 5 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
BLOCK DIAGRAM
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 6 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
DETAILED INFORMATION
A7534 is a low input voltage start up, current mode DC-DC step up converter. It’s operation can be best
understood by referring to the block diagram. Upon starting up, the low voltage startup circuitry drives SW
with on-off cycles, transferring energy from input to OUT by storing energy in the inductor during on-time and
releasing it to the output during off-time. When OUT reaches 2V, the startup circuit turns off and the main
controller takes over. The main control loop consists of a reference, a GM error amplifier, a PWM controller, a
current sense amplifier, an oscillator, a PWM logic control, and it is power stage including its driver. The main
control loop is a classic current mode control loop. The GM stage integrates the error between FB and REF,
and its output is used to compare with a triangular wave which the summing result of the current sense
amplifier output and a slope compensation voltage. The output of the comparator is used to drive the power
stage to reach regulation.
Application Information
Inductor selection
With switching frequency up to 1MHz, small surface mount inductors can be used with values from 2.2uH to
4.7uH. For a given chosen inductor value and application conditions make sure the peak inductor current
does not exceed the maximum current rating of the selected vendor's inductor.
Input and output capacitor selection
The A7534's bootstrap architecture allows the use of very small input capacitor. For applications that only
need to drive small output load current, the input capacitor is optional, because once output is started up, the
IC's is powered by OUT, a quiet power supply.
The output capacitor is used to stabilize the loop and provide ac current to the load. A low ESR ceramic cap
with values from 2.2uF to 22uF can be used. Smaller value capacitors are generally cheaper with small
footprints, while larger capacitor provides lower ripples and better transient load responses. Also, when
extreme low startup voltage is needed, larger output capacitors are needed for the part to startup under heavy
load condition.
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 7 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
PACKAGE INFORMATION
Dimension in SOT-23 (Unit: mm)
Dimension in SOT89-3 (Unit: mm)
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 8 -
A7534
AiT Semiconductor Inc.
DC-DC CONVERTER/BOOST(STEP-UP)
0.9V STARTUP, 1MHZ, 300MA IOUT, LOW IQ, SYNCHRONOUS
BOOST CONVERTER
www.ait-ic.com
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.
REV1.1
- JAN 2015 RELEASED, JUL 2016 UPDATED -
- 9 -
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