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參數(shù)資料
| 型號(hào)： | SC1486 |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller |
| 中文描述： | 雙同步降壓偽固定頻率的DDR電源控制器 |
| 文件頁(yè)數(shù)： | 1/17頁(yè) |
| 文件大?。?/td> | 342K |
| 代理商： | SC1486 |
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www.semtech.com
SC1486
Dual Synchronous Buck Pseudo Fixed
Frequency DDR Power Supply Controller
POWER MANAGEMENT
Description
The SC1486 is a dual output constant on synchronous-
buck PWM controller optimized for cost effective mobile
DDR applications. Features include high efficiency, a fast
dynamic response with no minimum on time, a REFIN
input and a buffered REFOUT pin capable of sourcing
3mA. The excellent transient response means that
SC1486 based solutions will require less output
capacitance than competing fixed frequency converters.
Revision 3, October 2002
Features
Constant on-time for fast dynamic response
VIN range = 1.8V – 25V
DC current sense using low-side RDS(ON) sensing
or sense resistor
Integrated reference buffer for VTT
Low power S3 state
Resistor programmable frequency
Cycle-by-cycle current limit
Digital soft-start
PSAVE option for VDDQ
Over-voltage/under-voltage fault protection
<20uA shutdown current
Low quiescent power dissipation
Two separate PGOOD indicators
Separate enable of each switcher
Integrated gate drivers with soft switching
Efficiency >90%
1% Internal reference
28 Lead TSSOP
Industrial temperature range
Applications
Typical Application Circuit
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.
The output voltage of the first controller can be adjusted
from 0.5V to VCCA. In DDR applications, this voltage is
set to 2.5 volts. A resistor divider from the 2.5 volt supply
is used to drive the REFIN pin of the second controller. A
unity gain buffer drives the REFOUT pin to the same
potential as REFIN. The second controller regulates its
output to REFOUT. Two frequency setting resistors set
the on-time for each buck controller. The frequency can
thus be tailored to minimize crosstalk. 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 for each
controller.
Notebook computers
CPU I/O supplies
Handheld terminals and PDAs
LCD monitors
Network power supplies
PGOOD1
EN1
+
C8
Q2
REFOUT
R10
L1
Q1
R3
PGND1
VBAT
VDDQ, 2.5V
+
C7
R11
R2
L2
VBAT
VDDQ/2
Q4
PGND1
VTT, 1.25V
SC1486
1
2
4
5
6
8
9
12
13
15
16
18
19
20
22
23
26
27
10
PGND1
DL1
ILIM1
LX1
DH1
REFIN
TON2
FBK2
PGOOD2
PGND2
DL2
ILIM2
LX2
DH2
EN/PSV1
TON1
FBK1
PGOOD1
REFOUT
Q3
R5
R4
PGOOD2
R1
R8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1486_03 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller |
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| SC1486AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Power Supply Controller |
| SC1486AITSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Power Supply Controller |
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