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| 型号： | SC2544MLTRT |
| 厂商： | Semtech |
| 文件页数： | 1/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-MLPQ |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 300kHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-MLPQ |
| 包装： | 标准包装 |
| 其它名称： | SC2544MLDKR |
SC2544
High Performance Wide Input Range
Dual Synchronous Buck Controller
POWER MANAGEMENT
Description
The SC2544 is a high performance dual PWM controller.
It is designed to convert a wide ranged input voltage down
to two independent output rails. 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 volt-
age mode control allow high efficiency operation, fast
transient responses, and flexible component selection
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.
Typical Application Circuit
Features
Independent dual-outputs
Wide input voltage range: 4.5V~28V
Adjustable output voltage down to 0.75V
Sequential and ratiometric start-up
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
Systems with 4.5V~28V input
LCDTV and PDPTV
Network and telecom systems
Portable devices
SC2544
VO1
ENABLE
FB1
VIN+
VIN+
VCC
1
2
3
4
5
6
7
8
9
10
11
VIN
VCC
EN
FB1
ERROUT1
SS1
ILIM1
BST1
DRVH1
PHASE1
DRVL1
AGND
ROSC
PWRGD
FB2
ERROUT2
SS2
ILIM2
BST2
DRVH2
PHASE2
DRVL2
24
23
22
21
20
19
18
17
16
15
14
VO1
VIN+
PWGRD
FB2
VO2
FB1
12
PGND
PVCC
13
VCC
FB2
Pinout shown as TSSOP-24.
Revision: August 10, 2005
1
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC2544TSTRT | 功能描述:IC REG CTRLR BUCK PWM VM 24TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| SC2545 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2545EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2545MLTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
| SC2545TSTRT | 制造商:Semtech Corporation 功能描述:Controller IC 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Dual-OUT Synchronous Buck Controller/PWM DC to DC Controller 4.5V to 28V Input 24-Pin TSSOP T/R |
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