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SC1470EVB PDF预览

SC1470EVB

更新时间: 2024-02-04 23:30:40
品牌 Logo 应用领域
商升特 - SEMTECH 控制器
页数 文件大小 规格书
25页 398K
描述
Synchronous Buck Pseudo Fixed Frequency Power Supply Controller

SC1470EVB 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:TSSOP
包装说明:MO-153AB-1, TSSOP-14针数:14
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.82
Is Samacsys:N其他特性:ALSO OPRERATES IN ADJUSTABLE MODE FROM 0.5 TO 5.5V
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:5.5 V
最小输入电压:4.5 V标称输入电压:5 V
JESD-30 代码:R-PDSO-G14JESD-609代码:e3
长度:5 mm湿度敏感等级:1
功能数量:1端子数量:14
最高工作温度:125 °C最低工作温度:-40 °C
最大输出电流:3.1 A封装主体材料:PLASTIC/EPOXY
封装代码:TSSOP封装等效代码:TSSOP14,.25
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:1.2 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:PUSH-PULL
最大切换频率:300 kHz温度等级:AUTOMOTIVE
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:0.65 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:4.4 mm
Base Number Matches:1

SC1470EVB 数据手册

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SC1470  
Synchronous Buck Pseudo Fixed  
Frequency Power Supply Controller  
POWER MANAGEMENT  
Description  
Features  
‹ Constant on-time for fast dynamic response  
‹ Programmable VOUT range = 0.5 – VCCA  
‹ VBAT range = 1.8V – 25V  
‹ DC current sense using low-side RDS(ON)  
sensing or sense resistor  
‹ Resistor programmable frequency  
‹ Cycle-by-Cycle current limit  
‹ Digital soft-start  
The SC1470 is a single output, constant on-time  
synchronous-buck PWM controller intended for use in  
notebook computers and other battery operated portable  
devices. Features include high efficiency and fast dynamic  
response with no minimum on time. The excellent  
transient response means that SC1470 based solutions  
will require less output capacitance than competing fixed  
frequency converters.  
‹ Combined EN and PSAVE functions  
‹ Over-voltage/under-voltage fault protection and  
Power Good output  
‹ 10µA typical shutdown current  
‹ Low quiescent power dissipation  
‹ 14 Lead TSSOP package  
‹ Industrial temperature range  
‹ 1% Internal reference (2% system DC accuracy)  
‹ Integrated gate drivers with soft switching  
The frequency is constant until a step in load or line voltage  
occurs, at which time the pulse density and frequency  
will increase or decrease to counter the change in output  
or input voltage. After the transient event, the controller  
frequency will return to steady state operation. At light  
loads, Power-Save Mode enables the SC1470 to skip  
PWM pulses for better efficiency.  
The output voltage can be adjusted from 0.5V to VCCA.  
A frequency setting resistor sets the on-time for flexibility  
in choosing filter components. The integrated gate drivers  
feature adaptive shoot-through protection and soft  
switching. Additional features include cycle-by-cycle  
current limit, digital soft-start, over-voltage and under-  
voltage protection, and a Power Good output.  
Applications  
‹ Notebook computers  
‹ CPU I/O supplies  
‹ Handheld terminals and PDAs  
‹ LCD monitors  
‹ Network power supplies  
Typical Application Circuit  
VBAT  
5VSUS  
5VSUS  
VBAT  
D1  
C1 0.1uF  
R1  
R2  
10R  
U1  
SC1470  
BST  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
EN/PSV  
RTON  
Q1  
C2  
10uF  
TON  
VOUT  
VCCA  
FB  
DH  
LX  
VOUT  
L1  
R3  
R4  
VOUT  
ILIM  
C3  
+
R5  
VDDP  
DL  
Q2  
PGOOD  
PGD  
VSSA  
C4  
1uF  
R6  
8
PGND  
C5  
C6  
1nF  
1uF  
Revision: April 29, 2005  
1
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