A7533E5R [AITSEMI]
DC-DC CONVERTER BOOST SYNCHRONOUS;
| 型号： | A7533E5R |
| 厂家： | 
AiT Semiconductor |
| 描述： | DC-DC CONVERTER BOOST SYNCHRONOUS DC-DC转换器 |
| 文件： | 总10页 (文件大小：278K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
DESCRIPTION
FEATURES
Low Vin Start-up Voltage down to 850mV
Ideal for Single Alkaline Cell operations
Capable of delivering 500mA output current at
Vin=3.0V, V out=3.3V
The A7533 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 850mV, making it an
ideal choice for single cell alkaline/NiMH battery
operations.
1MHz Switching Frequency allows small
inductor and output cap
Input boost-strapping allows using small or no
input cap
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.
Low Noise PWM control
Internally Compensated Current Mode Control
Internal Synchronous Rectifier
Logic Control Shutdown (IQ<1uA)
Available in SOT-25 Package.
The A7533 is available in SOT-25 Package.
ORDERING INFORMATION
APPLICATION
Medical Instruments
Bluetooth Headsets
Package Type
Part Number
Flash-Based MP3 Players
Wireless Mice
A7533E5R-XXX
A7533E5VR-XXX
SOT-25
SPQ: 3,000pcs/Reel
E5
XXX: Output Voltage
ADJ=Adjust
One to Three Cell Battery Operated Devices
Note
TYPICAL APPLICATION
V: Halogen free Package
R : Tape & Reel
AiT provides all RoHS products
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 1 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
PIN DESCRIPTION
Top View
Pin #
1
Symbol
FB
Function
Output Voltage Selection and Feedback Input. Connect this pin to G for
VOUT = 5V, to OUT for VOUT = 3.3V. Connect FB to a resistor divider to set
the output voltage using the following equation, VOUT= 0.6V(1+R1/R2)
Ground. Tie this pin directly to the local ground plane.
2
3
G
Enable Pin. Tie this pin to 0.6V or higher to enable the device. Tie below
0.3V to turn off the device.
EN
Switch Pin. Connect an inductor between this pin and Vin. Minimize the
metal trace area connected to this pin to minimize EMI.
4
5
SW
OUT
Output Pin. OUT also provides power to the IC itself.
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 2 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
ABSOLUTE MAXIMUM RATINGS
SW Voltage
-0.3V ~ 5.5V
-0.3V ~ 5.5V
190℃/W
EN, FB, OUT Voltage
Junction to Ambient Thermal Resistance
Maximum Power Dissipation
Operating Temperature Range
Storage Temperature
0.45W
-40℃ ~ 85℃
-55℃ ~ 150℃
Stresses above 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 in the Electrical Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 3 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
ELECTRICAL CHARACTERISTICS
VIN=1.8V, VOUT=3.3V, unless otherwise specified. Typical values are at TA=25℃
Parameter
Minimum Input Voltage
Startup Voltage
Conditions
MIN
TYP
0.7
0.85
3.3
5
MAX
Unit
V
-
-
-
1.1
V
FB = OUT
FB = G
3.23
3.36
V
Output Voltage
4.90
5.10
V
FB Feedback Voltage
FB Input Current
VOUT = 2.5 to 5V
-
-
0.6
-
-
50
5
-
V
nA
V
Output Voltage Range
Quiescent Current at OUT
External divider
VFB = 0.7V
2.5
-
-
50
0.1
1.0
0.3
0.6
-
µA
µA
MHz
Ω
Shutdown Supply Current at OUT EN = G
Switching Frequency
-
1
-
-
NMOS Switch ON Resistance
PMOS Switch ON Resistance
NMOS Switch Current Limit
ISW = 100mA
ISW = 100mA
-
-
-
-
Ω
1
-
A
V
OUT = 5.5V, VSW = 0 or 5.5V,
SW Leakage Current
-
-
1
uA
EN = G
EN Input Current
-
-
-
-
-
1
0.3
-
uA
V
EN Input Low Voltage
EN Input High Voltage
0.6
V
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 4 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
TYPICAL PERFORMANCE CHARACTERISTICS
Typical values are tested at TA = 25℃, unless otherwise specified.
1. Efficiency vs. Output Current
2. Efficiency vs. Output Current
VOUT = 3.3V, TA = 25℃
VOUT = 5V, TA = 25℃
3. Output Voltage vs. Output Current
4. Minimum Start-Up Voltage vs. Output Current
VOUT = 3.3V, TA = 25℃
VOUT = 3.3V, TA = 25℃
6. No Load Input Current vs. Input Voltage
5. VREF(T) / VREF(T = 20℃) vs. Temperature
VOUT = 3.3V, TA = 25℃, No load
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 5 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
7. Maximum Output Current vs. Input Voltage
L = 4.7uH, TA = 25℃
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 6 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
BLOCK DIAGRAM
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 7 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
DETAIL INFORMATION
A7533 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
Output Voltage selection
The output voltages can be set by connecting FB to OUT, to G or to the midpoint of a resistor divider
connected to OUT. See below table for details.
FB = GND
VOUT = 5.0V
FB = OUT
VOUT = 3.3V
FB to resistor divider
VOUT = 0.6V(1+R1/R2)
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 A7533's bootstrap architecture allows the use of very small input capacitors. 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.
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 8 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
PACKAGE INFORMATION
Dimension in SOT-25 Package (Unit: mm)
NOTE ：Package Outline Exclusive Of Mold Flash and Metal Burr.
Symbol
Min
Max
A
A1
b
0.90
0.01
0.30
0.09
1.10
0.10
0.50
0.20
c
D
2.90 BSC
E
2.60
3.00
E1
e
e1
L
1.60 BSC
0.95 BSC
1.90 BSC
0.30
0.55
L1
L2
θ
0.60 REF
0.25 BSC
0°
8°
ccc
ddd
0.10
0.20
0.10
0.20
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 9 -
A7533
AiT Semiconductor Inc.
www.ait-ic.com
DC-DC CONVERTER BOOST(STEP-UP)
LOW VOLTAGE STARTUP, 1MHz, 500mA SYNCHRONOUS
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
In order to
involve potential risks of death, personal injury, or server property, or environmental damage.
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.
REV2.0
- JUL 2010 RELEASED, JUN 2017 UPDATED -
- 10 -
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