參數(shù)資料
型號(hào)： LM25010MH
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 42V, 1.0A Step-Down Switching Regulator
中文描述： 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO14
封裝： PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 3/17頁(yè)
文件大?。?/td> 776K
代理商： LM25010MH
Pin Descriptions
Pin Number
LLP-10
1
Name
SW
Description
Application Information
TSSOP-14
2
Switching Node
Internally connected to the buck switch source.
Connect to the inductor, free-wheeling diode, and
bootstrap capacitor.
Connect a capacitor from SW to the BST pin. The
capacitor is charged from VCC via an internal diode
during the buck switch off-time.
During the buck switch off-time, the inductor current
flows through the internal sense resistor, and out of
the ISEN pin to the free-wheeling diode. The current
limit comparator keeps the buck switch off if the
ISEN current exceeds 1.25A (typical).
Re-circulating current flows into this pin to the
current sense resistor.
Ground return for all internal circuitry other than the
current sense resistor.
Input to both the regulation and over-voltage
comparators. The FB pin regulation level is 2.5V.
An internal 11.5 μA current source charges the SS
pin capacitor to 2.5V to soft-start the reference input
of the regulation comparator.
An external resistor from VIN to the RON/SD pin
sets the buck switch on-time. Grounding this pin
shuts down the regulator.
The voltage at VCC is nominally equal to V
IN
for V
IN
<
8.9V, and regulated at 7V for V
IN
>
8.9V.
Connect a 0.47 μF, or larger capacitor from VCC to
ground, as close as possible to the pins. An external
voltage can be applied to this pin to reduce internal
dissipation if V
IN
is greater than 8.9V. MOSFET
body diodes clamp VCC to VIN if V
CC
>
V
IN
.
Nominal input range is 6V to 42V. Input bypass
capacitors should be located as close as possible to
the VIN pin and RTN pins.
No internal connection. Can be connected to ground
plane to improve heat dissipation.
Exposed metal pad on the underside of the device.
It is recommended to connect this pad to the PC
board ground plane to aid in heat dissipation.
2
3
BST
Boost pin for bootstrap capacitor
3
4
ISEN
Current sense
4
5
SGND
Current Sense Ground
5
6
RTN
Circuit Ground
6
9
FB
Voltage feedback input from the
regulated output
Softstart
7
10
SS
8
11
RON/SD
On-time control and shutdown
9
12
VCC
Output of the bias regulator
10
13
VIN
Input supply voltage
1,7,8,14
NC
No connection.
EP
Exposed Pad
L
www.national.com
3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM25010MH/NOPB 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 42V,1.0A STEP-DOWN SWITCHING REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
LM25010MHX 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM25010MHX/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM25010Q0MH 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM25010Q0MH/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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