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SC415EVB Datasheet

  • SC415EVB

  • Dual Synchronous Buck Controller

  • 927.70KB

  • 30頁

  • SEMTECH   SEMTECH

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SC415
Dual Synchronous Buck Controller
POWER MANAGEMENT
Features
VIN Range 3-25V
Outputs Adjustable from 0.75 to 5.25V,
or Preset Output Voltages:
VOUT1 = 1.8 or 1.5V
VOUT2 = 1.25 or 1.05V
Low Shutdown Power
Constant On-Time for Fast Dynamic Response
Adjustable Switching Frequency
Separated Frequencies for Minimal Switching
Interaction:
VOUT1 = up to 600kHz
VOUT2 = up to 720kHz
Power Save or Continuous Operation at Light Load
Adjustable Soft-start Rates for Each Output
Soft-Shutdown for Each Output
Over-Voltage and Under-Voltage Fault Protection
Cycle-by-Cycle Valley Current Limit
DC Current Sense Using Low-Side RDSON Sensing,
or RSENSE in Source of Low-Side MOSFET for Greater
Accuracy
Separate Power Good Outputs
Separate Enable/Power Save Inputs
3.1A Non-Overlapping Gate Drive
SmartDrive
TM
for High-Side MOSFET
MLP 4x4 24 Pin Package
Industrial Temperature Range
Description
The SC415 is a versatile, constant on-time, pseudo fixed-
frequency, dual synchronous buck PWM controller
intended for notebook computers and other battery
operated portable devices. The SC415 contains all the
features needed to provide cost-effective control of two
independent switchmode power supplies.
The two DC outputs are adjustable from 0.75V to 5.25V.
Additional features for each output include cycle-by-
cycle current limit, voltage soft-start, under-voltage and
over-voltage protection, programmable over-current
protection, soft shutdown, selectable power save and
non-overlapping gate drive. The SC415 provides two
enable/power save inputs, two soft-start inputs, two
power good outputs and an on-time adjust input.
The constant on-time topology provides fast dynamic
response. The excellent transient response means that
SC415 based solutions require less output capacitance
than competing fixed-frequency converters. Switching
frequency is constant until a step in load or line voltage
occurs, at which time the pulse density and frequency
moves to counter the change in output voltage. After the
transient event, the controller frequency returns to steady
state operation. At light loads with power save enabled,
the SC415 reduces switching frequency for improved
efficiency.
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Applications
Notebook and Sub-Notebook Graphics
Voltage Controllers
Tablet PCs
Embedded Applications
Oct 08, 2007
漏 2007 Semtech Corporation
1

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