Download EUP7117 High Efficiency, Synchronous Step-Down Controller

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Transcript
EUP7117
High Efficiency, Synchronous
Step-Down Controller
DESCRIPTION
FEATURES
The EUP7117 is a high-efficiency, low power synchronous
buck controller for a core logic power supply in notebook
applications. Two external N-channel MOSFETs are
needed by the controller to generate an output voltage as
low as 0.75V and output current up to 15A from an input
supply (1.8V to 28V). EUP7117 features two operation
modes: the pulse-skipping mode for high efficiency at light
load and the forced PWM mode for low noise applications.
The EUP7117 automatically adjusts operating frequency to
achieve fast transient response during load transient.
EUP7117 has built in output monitoring, positive and
negative
current
limit,
over-voltage
protection,
under-voltage protection and thermal shutdown. EUP7117
requires a 5V(4.5V~5.5V) power supply to power internal
control circuitry and gate drivers.
The EUP7117 is available in the 14 pin TSSOP package
and specified from -40°C to +85°C.
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Input Voltage Range:1.8V~28V
Output Voltage Range:0.75V~5.5V
Adjustable Frequency 100kHz to 600kHz
PWM Mode with 100ns Load Step Response
Selectable Operating Modes: Pulse-Skipping Mode
and Forced PWM Mode
<1% Initial Reference Accuracy
Typically 4µA Shutdown Current
Over-Current Sensing from Low Side RDS (On)
with 4500ppm/°C Temperature Compensation
Positive and Negative Over-Current Limit
Built in Bootstrap Diode
OVP/UVP and Thermal Shutdown
Power Good Detection
Soft-Start and Soft-Stop
Available in TSSOP-14 Package
RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
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Notebooks
I/O Supplies
System Power Supplies
Typical Application Circuit
Figure.1 Typical Application Circuit
DS7117
Ver1.0
Feb. 2009
1
www.BDTIC.com/EUTECH