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參數(shù)資料
| 型號： | LT3582EUD-12#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.72 A SWITCHING REGULATOR, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 315K |
| 代理商： | LT3582EUD-12#PBF |
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LT3582/LT3582-5/LT3582-12
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OPERATION
The LT3582 series are dual DC/DC converters, each contain-
ing both a Boost and an Inverting converter. Operation can
be best understood by referring to the Block Diagram. The
Boost and Inverting converters each use a novel control
technique, which simultaneously varies both peak inductor
current and switch off time. This results in high efciency
over a large load range and low output voltage ripple. In
addition, this technique further minimizes output ripple
when the switching frequency is in the audio band.
Boost Converter: The Boost converter uses a grounded
source NMOS power transistor as the main switching ele-
ment. The current in the NMOS is constantly monitored and
controlled, along with the off-time of the switch to achieve
regulation of VOUTP. The VOUTP voltage is divided by the
internal programmable (LT3582 only) resistor divider to
create FBP. The voltage on FBP is compared to an internal
reference and amplied, creating an error signal on the
VCP node which commands the appropriate peak inductor
current and off time for the subsequent switching cycle.
Inverting Converter: The Inverting converter uses a power
PMOS transistor with the source connected to VIN. This
topology requires only one external inductor, instead of
the normally required two inductors plus ying capacitor.
Regulation is achieved in a similar manner as the Boost.
Output Power-Up Sequencing: After an initial start-up
delay (TSTART-UP = 64μs typical), the outputs VOUTP and
VOUTNrise(inmagnitude)simultaneouslywiththeLT3582-5/
LT3582-12 or in one of four selectable sequences with
the LT3582. Using the I2C interface, the LT3582 outputs
can be congured such that (1) they both rise simultane-
ously, (2) VOUTP rises to regulation before VOUTN rises, (3)
VOUTN rises to regulation before VOUTP rises, or (4) neither
output rises. The outputs of the LT3582-5 and LT3582-12
are pre-congured to rise simultaneously.
The ramp rates of the outputs are proportional to the ramp
rates of their respective RAMP pins. A capacitor is placed
between each RAMP pin and ground. The RAMP pins are
discharged during shutdown. Once enabled, congurable
(LT3582) or pre-congured (LT3582-5/LT3582-12) cur-
rents charge each RAMP pin in the desired sequence
causing the outputs to rise.
Output Power-Down Discharge: The power-down dis-
charge feature is permanently enabled on the LT3582-5
and LT3582-12 and can be enabled or disabled through
I2C on the LT3582. Upon SHDN falling, and when power-
down discharge is enabled, internal transistors will acti-
vate to assist in discharging the outputs toward ground.
When power-down discharge is disabled, the chip powers
down immediately after SHDN falls and the outputs will
discharge on their own depending on their external load
capacitances and currents.
OTP Memory (LT3582 Only): The LT3582 includes 22 bits
of user programmable output settings and 1 programming
lockout bit. Parameters such as positive and negative output
voltages and power sequencing settings can be changed
in real time with the integrated I2C interface. Settings can
then be made permanent by programming to the on-chip
non-volatile OTP (One Time Programmable) memory.
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| LT3582EUD#TRPBF | 0.72 A SWITCHING REGULATOR, PQCC16 |
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3582EUD-12TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:I2C Programmable Boost and Single Inductor Inverting DC/DC Converters with OTP |
| LT3582EUD-5#PBF | 功能描述:IC REG BOOST INV +/-5V DL 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LT3582EUD-5#TRPBF | 功能描述:IC REG BOOST INV +/-5V DL 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LT3582EUD-5PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:I2C Programmable Boost and Single Inductor Inverting DC/DC Converters with OTP |
| LT3582EUD-5TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:I2C Programmable Boost and Single Inductor Inverting DC/DC Converters with OTP |
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