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參數(shù)資料
| 型號(hào)： | SC1480EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | DDR Memory Power Supply Controller |
| 中文描述： | DDR內(nèi)存電源控制器 |
| 文件頁(yè)數(shù)： | 1/22頁(yè) |
| 文件大?。?/td> | 545K |
| 代理商： | SC1480EVB |
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www.semtech.com
SC1480
DDR Memory
Power Supply Controller
POWER MANAGEMENT
Description
Revision: August 30, 2006
Features
Applications
Notebook computers
CPU I/O supplies
Handheld terminals and PDAs
LCD monitors
Network power supplies
Typical Application Circuit
Constant on-time for fast dynamic response
Programmable VOUT based on external reference
VIN range = 1.8V – 25V
DC current sense using low-side RDS(ON) sensing
or sense resistor
3mA reference output buffer
Low power S3 state
Resistor programmable frequency
Cycle-by-cycle current limit
Digital soft start
Output current source-sink capability
Overvoltage/under-voltage fault protection and
PGOOD output
Under 10uA typical shutdown current
Low quiescent power dissipation
14-Pin TSSOP package. Also available in Lead-free
package which is fully WEEE and RoHS compliant
Industrial temperature range
Integrated gate drivers with soft switching
Efficiency >90%
The SC1480 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, a reference input and a buffered
REFOUT pin capable of sourcing 3mA. The excellent
transient response means that SC1480 based solutions
will require less output capacitance than competing fixed
frequency converters.
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.
The SC1480 incorporates two power-reducing states,
standby and shutdown. In standby mode, the switcher
output is shutdown but the buffered reference output
stays up, reducing quiescent current to a low 12
5
μA. This
is particularly useful for reducing battery draw in systems
which implement a suspend-to-RAM (S3) state. The
SC1480 can be completely shut down, drawing less than
10μA.
The integrated gate drivers feature adaptive shoot-
through protection and soft switching. Additional features
include cycle-by-cycle current limit, digital soft-start,
overvoltage and under-voltage protection, and a PGOOD
output.
R7
C9
C10
4.5V - 25V
+
C6
PGOOD
+5VSB
VDD = 2.5V
R2
R4
C4
L1
R1
1.25VOUT
C5
C2
R5
C3
U1
SC1480
1
2
3
4
5
6
7
8
9
10
11
12
13
14
REFIN
TON
REFOUT
VCCA
FBK
PGOOD
GND
PGND
DL
VDDP
ILIM
LX
DH
BST
C1
+5V
D1
Q2
C7
R6
D2
Q1
C8
R3
REFOUT
+5VRUN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC1480ITSTR | DDR Memory Power Supply Controller |
| SC1480ITSTRT | DDR Memory Power Supply Controller |
| SC1485 | Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| SC1485ITSTR | Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| SC1485ITSTRT | Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1480ITSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:DDR Memory Power Supply Controller |
| SC1480ITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC Leaded Process Compatible: |
| SC1485 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| SC1485_05 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| SC1485ITS.TRT/KO | 制造商:Semtech Corporation 功能描述: |
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