參數(shù)資料
型號(hào)： SC411
廠商： Semtech Corporation
英文描述： Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
中文描述： 同步降壓偽固定頻率電源控制器
文件頁(yè)數(shù)： 1/27頁(yè)
文件大?。?/td> 488K
代理商： SC411
www.semtech.com
1
POWER MANAGEMENT
Description
SC411
Synchronous Buck Pseudo-Fixed
Frequency Power Supply Controller
June 2007
The SC411 is a constant on-time synchronous buck PWM
controller in a space-saving MLPQ package intended for
use in notebook computers and other battery operated
portable devices. Features include high ef
fi
ciency and
a fast dynamic response with no minimum on-time. The
excellent transient response means that SC411 based solu-
tions will require less output capacitance than competing
fi
xed frequency converters.
The switching frequency is constant until a step-in load or
line voltage occurs. During this 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, Powersave Mode enables the SC411 to skip
PWM pulses for better ef
fi
ciency.
The output voltage can be adjusted from 0.5V to VCCA. A
frequency setting resistor sets the on-time for the controller.
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, a Power Good output and
soft discharge upon shutdown.
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
Powersave option
Over-voltage/under-voltage fault protection
10
μ
A typical shutdown current
Low quiescent power dissipation
Power good indicator
1.2% reference
Integrated gate drivers with soft switching
Enable pin
16 pin MLPQ (4mm x 4mm)
Output soft discharge upon shutdown
Notebook Computers
CPU/IO Supplies
Handheld Terminals and PDAs
LCD Monitors
Network Power Supplies
Features
Typical Application Circuit
Applications
C6
1uF
R3
R6
VOUT
C5
1nF
R1
RTON1
VBAT
PGOOD
Q1
C7
1uF
R5
C1 0.1uF
D1
C2
10uF
VBAT
5VSUS
L1
+
C4
VOUT
R2
10R
R4
5VSUS
VOUT
1
VCCA
2
FB
3
PGD
4
N
5
V
6
P
7
D
8
VDDP
9
ILIM
10
LX
11
DH
12
B
1
N
1
E
1
T
1
T
U1
SC411
Q2
C3
相關(guān)PDF資料
PDF描述
SC411EVB Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
SC411MLTRT Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
SC412A Synchronous Buck Controller
SC412AEVB Synchronous Buck Controller
SC412AMLTRT Synchronous Buck Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC411201B 制造商:Freescale Semiconductor 功能描述:MOTSC411201B ACCTON:110000000028H
SC411209B 制造商:Freescale Semiconductor 功能描述:
SC411212C 制造商:Freescale Semiconductor 功能描述:
SC411EVB 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
SC411MLTRT 制造商:Semtech Corporation 功能描述:Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
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