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| 型號： | SC2545TSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Wide Input Range Dual Synchronous Buck Controller |
| 中文描述： | 高性能寬輸入范圍的雙同步降壓控制器 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大小： | 898K |
| 代理商： | SC2545TSTRT |
1
www.semtech.com
SC2545
High Performance Wide Input Range
Dual Synchronous Buck Controller
POWER MANAGEMENT
Description
The SC2545 is a high performance dual PWM controller.
It is designed to convert a wide ranged input voltage down
to two independent output rails. The SC2545 support
“
peel off
”
tracking for the two outputs at start up which
means the two outputs ramp up together till the one
with lower output level reaching the regulation. The PWM
operations of the two channels are 180 degree out of
phase which can greatly reduce the size and the cost of
the input capacitors. Synchronous Buck PWM topology
and voltage mode control allow high efficiency operation,
fast transient responses, and flexible component selec-
tion for easy designs. A 10V internal linear regulator pro-
vides the bias for the controller, and this voltage is opti-
mized for gate drivers to deliver high efficiency. The power
sequencing is fully supported including independent start
up, and power good output. In the shut down mode the
controller only draws 100nA from the supply. The con-
troller also offers full protection features for the condi-
tions of under voltage, over voltage, and the over current.
There is no need for a current sensing resistor because
the MOSFET on resistance is used for the sensing
element. The switching frequency is adjustable from 100
kHz to 300 kHz. Two packages TSSOP-24 and MLPQ-24
are offered.
Revision: August 10, 2005
Features
Independent dual-outputs
“
Peel off
“
start up trackingIndependent dual-outputs
Wide input voltage range: 4.5V~28V
Adjustable output voltage down to 0.75V
Flexible power sequencing with enable and power
good output
Synchronous Buck topology with voltage mode
control
Out of phase operation to reduce cost of input
capacitor
10V internal regulator for gate driver to deliver high
efficiency
Programmable switching frequency:
100kHz~300kHz
Full protection: UVLO, OVP and programmable
OCP
No need for current sense resistor
Low shutdown current (100nA typical)
24 lead TSSOP and MLPQ packages
Fully WEEE and RoHS Compliant
Applications
Typical Application Circuit
Systems with 4.5V~28V input
LCDTV and PDPTV
Network and telecom systems
Pinout shown as TSSOP-24.
VO1
VIN+
VO1
VIN+
FB1
FB1
PWGRD
FB2
FB2
VCC
VCC
ENABLE
VO2
VIN
1
VCC
2
EN
3
FB1
4
ERROUT1
5
SS1
6
ILIM1
7
BST1
8
DRVH1
9
PHASE1
10
DRVL1
11
AGND
24
ROSC
23
PWRGD
22
FB2
21
ERROUT2
20
SS2
19
ILIM2
18
DRVH2
16
DRVL2
14
PVCC
13
PGND
12
PHASE2
15
BST2
17
SC2545
VIN+
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| SC258DR2 | 功能描述:運算放大器 - 運放 ANA LO PWR OP AMP DUAL RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| SC258DR2G | 功能描述:運算放大器 - 運放 ANA LO PWR O A DUAL QUD RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| SC258N | 功能描述:運算放大器 - 運放 ANA LO PWR OP AMP DUAL RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| SC258NG | 功能描述:運算放大器 - 運放 ANA LO PWR O A DUAL QUD RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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