参数资料
| 型号： | SC470ITSTRT |
| 厂商： | Semtech |
| 文件页数： | 1/31页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 14-TSSOP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 电源电压： | 5 V ~ 5.5 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 ~ 125°C |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC470ITSDKR |
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SC470
NOT RECOMMENDED FOR NEW DESIGN
Synchronous Buck Controller for
Dynamic Load-Voltage Applications
POWER MANAGEMENT
Description
The SC470 is a single output, constant on-time
synchronous-buck, pseudo-fixed frequency, 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 SC470 based solutions will require less
output capacitance than competing fixed frequency
converters.
The SC470 is specifically targeted for graphics processor
power supplies that require dynamic voltage transition,
with a tight 0.85% DC accuracy and a 20% OVP threshold.
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 SC470 to
skip PWM pulses for better efficiency.
The output voltage can be adjusted from 0.5V to VCCA.
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 PGD output.
Typical Application Circuit
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 RSENSE in source of low-side MOSFET for
greater accuracy
Resistor programmable on-time
Cycle-by-cycle current limit
Digital soft-start
Combined EN and PSAVE functions
Over-voltage/under-voltage fault protection
and PGD output
20% OVP threshold for simpler dynamic voltage
transition circuitry
5μA typical shutdown current
Low quiescent power dissipation
14 lead TSSOP and 16 pin MLPQ (4mm x 4mm)
packages
Industrial temperature range
0.85% DC accuracy
Integrated gate drivers with soft-switching
Applications
Graphics Cards
Embedded Graphics Processors
High Performance Processors
VBAT
5VSUS
5VSUS
VBAT
D1
R1
R1
U1
SC470
C1
0.1uF
RTON
10R
EN/PSV
BST
Q1
C2
TON
DH
10uF
R2
VOUT
R2
VOUT
VCCA
LX
ILIM
R3
L1
+
C3
VOUT
FB
VDDP
Q2
PGOOD
PGD
DL
C5
R4
C6
VSSA
PGND
C4
1uF
1nF
1uF
September 27, 2005
1
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC471 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471_08 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471AEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471AMLTRT | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
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