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SC1485ITSTRT Datasheet

  • SC1485ITSTRT

  • Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Co...

  • 17頁

  • SEMTECH   SEMTECH

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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.
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.
SC1485
Features
Constant on-time for fast dynamic response
Programmable VOUT range = 0.5 鈥?VCCA
VIN Range = 1.8V 鈥?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
Notebook computers
CPU I/O supplies
Handheld terminals and PDAs
LCD monitors
Network power supplies
Typical Application Circuit
R1
VBAT
R2
9
8
22
TON2
EN/PSV2
EN/PSV1
23
TON1
PGOOD1
27
13
PGOOD1
PGOOD2
VBAT
SC1485
PGOOD2
EN2
EN1
DH2
LX2
20
19
R8
18
16
15
12
26
Q4
L2
VOUT2
Q3
+
C8
Q1
6
5
R3
4
DH1
LX1
ILIM1
DL1
PGND1
ILIM2
DL2
PGND2
FBK2
FBK1
VOUT1
L1
R7
R4
+
C7
Q2
2
1
PGND1
R6
R5
PGND1
Revision: October 14, 2004
1
www.semtech.com

SC1485ITSTRT 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 控制器

  • 2

  • -

  • 90%

  • 1.8 V ~ 25 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 125°C

  • 28-TSSOP（0.173"，4.40mm 寬）

  • 帶卷 (TR)

  • SC1485ITSTR

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