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A7430 の電気的特性と機能

A7430のメーカーはAiT Semiconductorです、この部品の機能は「3A ADJUST FREQUENCY STEP DOWN DC-DC CONVERTER」です。


製品の詳細 ( Datasheet PDF )

部品番号 A7430
部品説明 3A ADJUST FREQUENCY STEP DOWN DC-DC CONVERTER
メーカ AiT Semiconductor
ロゴ AiT Semiconductor ロゴ 




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A7430 Datasheet, A7430 PDF,ピン配置, 機能
AiT Semiconductor Inc.
www.ait-ic.com
A7430
DC-DC CONVERTER BUCK
3A ADJUST FREQUENCY STEP DOWN DC-DC CONVERTER
DESCRIPTION
The A7430 consists of step-down switching
FEATURES
Input voltage : 4.2V to 40V
regulator with PWM control. These devises include Output voltage : 0.8V to 38V
a reference voltage source, oscillation circuit, error Duty ratio : 0% to 100% PWM control
amplifier, internal PMOS and etc.
Oscillation frequency range is 50K to 600KHz
A7430 provides low-ripple power, high efficiency and
by outside resistance setting
external transient characteristics. The PWM control Current limit, Short Circuit Protect (SCP) and
circuit is able to the duty ratio linearly from 0 up to
Thermal Shutdown protection
100%.The converter is build out soft start function Built-in internal SW P-channel MOS
that prevents overshoot and inrush current at startup. Available in PSOP8 Package
An over current protect function and short circuit
protect function are built inside, and when OCP or
SCP happens, the operation frequency will be
reduced. The operating frequency is decided by
outside resistance. An external compensation is
easily to system stable.
APPLICATION
Portable DVD Players
Car Application
Telecom/Networking Equipment
Set Top Boxes
With the addition of an internal P-channel Power
MOS, a coil, capacitors, and a diode connected ORDERING INFORMATION
externally, these ICs can function as step-down
switching regulators. They serve as ideal power
supply units for portable devices when coupled with
the PSOP8 with exposed pad package, providing
such outstanding features as low current
consumption. Since this converter can accommodate
an input voltage up to 40V, it is also suitable for the
operation via an AC adapter.
The A7430 is available in PSOP8 package.
Package Type
Part Number
PSOP8
MP8
A7430MP8R
A7430MP8VR
Note
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
Suffix V means Halogen free Package
TYPICAL APPLICATION
REV1.0
- AUG 2012 RELEASED -
-1-

1 Page





A7430 pdf, ピン配列
AiT Semiconductor Inc.
www.ait-ic.com
A7430
DC-DC CONVERTER BUCK
3A ADJUST FREQUENCY STEP DOWN DC-DC CONVERTER
ABSOLUTE MAXIMUM RATINGS
TA=25°C, Unless Otherwise Noted
VCC, Supply Voltage
VSS-0.3V to VSS+42V
VFB, Feedback Voltage
VSS -0.3V to 6V
VEN/SS, EN pin Voltage
VSS -0.3V to 6V
VOSC, OSC pin Voltage
VSS -0.3V to 6V
VCOMP, COMP pin Voltage
VSS -0.3V to 6V
VOCSET, OCSETMP pin Voltage
VSS -0.3V to 6V
VSW, Switch pin Voltage
VSS -0.3V to VCC+0.3V
TST, Storage Temperature Range
-65to 150
TOJP, Operation Junction Temperature Range
-40to 125
VOP, Operation Supply Voltage
4.2V to 40V
θJA, Thermal Resistance (Junction to Ambient)
90/W
θJC, Thermal Resistance (Junction to Case)
15/W
TSTG, Soldering Temperature
300, 5sec
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.
NOTE1: θJA is measured with the PCB copper area (need connect to Exposed PAD) of approximately 1.5 in2(Multi-layer).
REV1.0
- AUG 2012 RELEASED -
-3-


3Pages


A7430 電子部品, 半導体
AiT Semiconductor Inc.
www.ait-ic.com
A7430
DC-DC CONVERTER BUCK
3A ADJUST FREQUENCY STEP DOWN DC-DC CONVERTER
DETAILED INFORMATION
EN
This pin can be supplied shutdown function. It is inside pull high function. For normal application, the pin must
be connected a capacitor to ground. Allow the switching regulator circuit to be shutdown pulling this pin below
a 0.8V threshold voltage; the shutdown supply current is approximately 150uA.
OSC
External frequency set pin. The pin connects a resistance (R3) to reduce system frequency. This converter’s
frequency can be set from 50K to 600KHz. Please refer the below table to set frequency.
R3
Frequency
510K
47KHz
220K
100KHz
100K
200KHz
56K
300KHz
36K
400Kz
27K
500KHz
20K
600KHz
COMP
Compensation pin. For EL output capacitor application, the COMP pin connects R2 and C4 to ground for all
condition.
OCSET
The current limit threshold is setting by the external resister connecting from VCC supply to OCSET. The
internal 60uA sink current crossing the resistor sets the voltage at pin of OCSET. When the VS voltage is less
than the voltage at OCSET, an over-current condition is triggered.
Application Information
Setting the Output Voltage
Application circuit item shows the basic application circuit with adjustable output version. The external resistor
sets the output voltage according to the following equation:
REV1.0
Table 1 Resistor select for output voltage setting
VOUT
5V
3.3V
2.5V
1.8V
1.5V
1.2V
R4
1.3K
1.5K
2.2K
2K
2.2K
2K
R5
6.8K
4.7K
4.7K
2.5K
2K
1K
- AUG 2012 RELEASED -
-6-

6 Page



ページ 合計 : 9 ページ
 
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部品番号部品説明メーカ
A7430

3A ADJUST FREQUENCY STEP DOWN DC-DC CONVERTER

AiT Semiconductor
AiT Semiconductor


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