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參數(shù)資料
| 型號： | SC2440TETRT |
| 廠商： | Semtech Corporation |
| 英文描述： | 2.5 MHz Dual Switching Regulator with Integrated 2A Switches |
| 中文描述： | 2.5 MHz雙開關(guān)穩(wěn)壓器集成甲開關(guān) |
| 文件頁數(shù)： | 4/26頁 |
| 文件大?。?/td> | 643K |
| 代理商： | SC2440TETRT |
4
2005 Semtech Corp.
www.semtech.com
SC2440
POWER MANAGEMENT
Pin Configuration
Ordering Information
Underside metal must be soldered to ground.
Pin #
Pin Name
Pin Function
1, 8
BOOST1,
BOOST2
Supply pins to the power transistor drivers.Tie to external diode-capacitor charge pumps to
generate drive voltages higher than V
IN
in order to fully saturate the internal NPN power switches.
2, 7
SW1, SW2
Emitters of the internal power NPN transistors. Connect to the inductors, the freewheeling diodes
and the boost capacitors.
3, 6
IN
Input power supply pins of the SC2440 and also the common collector of the internal power
NPNs. Pins 3 and 6 are internally tied together and must be locally bypassed.
4
SYNC
Driving the SYNC pin with an external clock synchronizes both step-down converters. The
external clock frequency must be at least twice the individual regulator set (or free-running)
frequency. Tie this pin to ground if not used.
5
ROSC
An external resistor between this pin and the ground sets the master oscillator free-running
frequency. The set frequency is twice that of the individual switching regulator.
9, 16
FB1, FB2
The inverting inputs of the error amplifiers. Each FB pin is tied to a resistive divider between its
output and the ground for setting the channel output voltage.
10, 15
COMP1,
COMP2
These are the outputs of the internal error amplifiers. The voltages on these pins control the peak
switch currents. RC networks at these pins compensate the control loops. Pulling either pin below
0.7V stops the corresponding switching regulator.
11, 14
PGOOD1,
PGOOD2
Open collector outputs of the Power Good comparators. Tie to external pull-up resistors from the
input or the output of the converter. The PGOOD outputs become valid as soon as V
rises
above 1 V
during power-up. PGOOD is actively pulled low until the corresponding FB pin rises
to within 10% of the final regulation voltage.
12, 13
SS1, SS2
A capacitor from either SS pin to the ground provides soft-start and overload hiccup functions
for that channel. Pulling either SS pin below 0.8V with an open drain or collector transistor shuts
off the corresponding regulator. To completely shut off the SC2440 to low-current state, pull both
SS pins to the ground. Soft-start is recommended for all applications.
Underside
Metal
GND
The exposed pad at the bottom of the package is the electrical ground connection of the
SC2440. It also provides a thermal contact to the circuit board. It is to be soldered to the ground
plane of the board.
Pin Descriptions
Part Number
Package
(1)(2)
SC2440TETRT
TSSOP-16 EDP
SC2440EVB
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel contains
2500 devices.
(2) Lead free product. This product is fully WEEE and RoHS
compliant.
1
2
3
4
5
6
7
8
FB1
BOOST1
TOP VIEW
(16 Pin TSSOP-EDP)
13
12
14
15
16
11
10
9
COMP1
SW1
PGOOD1
IN
SS1
SYNC
SS2
ROSC
PGOOD2
IN
COMP2
SW2
FB2
BOOST2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2441A | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441 | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441EVB | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC2441 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 制造商:Semtech Corporation 功能描述: |
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