参数资料
| 型号： | SC1485ITSTRT |
| 厂商： | Semtech |
| 文件页数： | 1/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 28-TSSOP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 占空比： | 90% |
| 电源电压： | 1.8 V ~ 25 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： | 28-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： | SC1485ITSDKR |
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SC1485
POWER MANAGEMENT
Description
NOT RECOMMENDED FOR NEW DESIGN
Dual Synchronous Buck Pseudo Fixed
Frequency Power Supply Controller
Features
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.
The switching 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.
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
Separate PSAVE option for each switcher
Over-voltage/Under-voltage fault protection
10μA typical shutdown current
Low quiescent power dissipation
Two Power Good indicators
1% Reference (2% system DC accuracy)
Integrated gate drivers with soft switching
Separate enables
28 Lead TSSOP
Industrial temperature range
Applications
Notebook computers
CPU I/O supplies
Handheld terminals and PDAs
LCD monitors
Network power supplies
VBAT
5VSUS
5VSUS
VBAT
D1
R1
R2
U1
SC1485
C1
0.1uF
RTON1
10R
22
EN/PSV1
BST1
7
Q1
C2
23
TON1
DH1
6
10uF
VOUT1
24
VOUT1
LX1
5
L1
R3
25
VCCA1
ILIM1
4
R4
C3
VOUT1
R5
+
PGOOD
26
27
FB1
PGD1
VDDP1
DL1
3
2
Q2
R6
VSSA1
0R
C4
C5
R7
C6
28
VSSA1
PGND1
1
1uF
1nF
1uF
VBAT
VSSA1
5VSUS
VBAT
5VSUS
D2
R8
R9
C7
0.1uF
RTON2
10R
8
EN/PSV2
BST2
21
Q3
C8
9
TON2
DH2
20
10uF
VOUT2
10
VOUT2
LX2
19
L2
R10
11
VCCA2
ILIM2
18
R11
C9
VOUT2
R12
+
12
FB2
VDDP2
17
Q4
R13 0R
PGOOD
13
PGD2
DL2
16
VSSA2
C10
C11
R14
C12
14
VSSA2
PGND2
15
1uF
1nF
1uF
VSSA2
Revision: April 26, 2005
1
www.semtech.com
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