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參數(shù)資料
| 型號： | SC1485ITSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| 中文描述： | 雙同步降壓偽固定頻率電源控制器 |
| 文件頁數(shù)： | 1/17頁 |
| 文件大?。?/td> | 362K |
| 代理商： | SC1485ITSTRT |
1
www.semtech.com
SC1485
Dual Synchronous Buck Pseudo Fixed
Frequency Power Supply Controller
POWER MANAGEMENT
Description
The SC1485 is a dual output constant on synchronous-
buck PWM controller intended for use in notebook
computers and other battery operated portable devices.
Features include high efficiency and a fast dynamic
response with no minimum on time. The excellent
transient response, means that SC1485 based solutions
will require less output capacitance than competing fixed
frequency converters.
Revision: October 14, 2004
Features
Constant on-time for fast dynamic response
Programmable VOUT range = 0.5 – VCCA
VIN 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
Separate PSAVE option for each switcher
Over-voltage/Under-voltage fault protection
10uA Typical shutdown current
Low quiescent power dissipation
Two PGOOD indicators
1% Reference (2% system DC accuracy)
Efficiency >90%
Integrated gate drivers with soft switching
Separate enables
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. After the transient event, the controller
frequency will return to steady state operation. At light
loads, Power-Save Mode enables the SC1485 to skip
PWM pulses for better efficiency.
Each output voltage can be independently adjusted from
0.5V to VCCA. 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, over-voltage 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
VBAT
SC1485
1
2
4
5
6
9
12
13
15
16
18
19
20
22
23
26
27
8
PGND1
DL1
ILIM1
LX1
DH1
TON2
FBK2
PGOOD2
PGND2
DL2
ILIM2
LX2
DH2
EN/PSV1
TON1
FBK1
PGOOD1
EN/PSV2
VOUT2
PGND1
R3
R7
PGOOD1
EN1
R5
PGOOD2
PGND1
Q2
+
C7
R8
R2
R6
R1
Q1
L2
Q3
VBAT
VOUT1
R4
EN2
L1
+
C8
Q4
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| SC1486AITSTR | Complete DDR1/2/3 Power Supply Controller |
| SC1486AITSTRT | Complete DDR1/2/3 Power Supply Controller |
| SC1486A_06 | Complete DDR1/2/3 Power Supply Controller |
| SC1486AEVB | Complete DDR1/2/3 Power Supply Controller |
| SC1486A | Dual Synchronous Buck DDR and DDR2 Power Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1486 | 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 |
| 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 |
| SC1486A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck DDR and DDR2 Power Supply Controller |
| SC1486A_06 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Power Supply Controller |
| SC1486AEVB | 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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