EN6347QI3 ENPIRION [Enpirion, Inc.], EN6347QI3 Datasheet - Page 8

• Manufacturer Part Number: EN6347QI3
• Description: 4A Voltage Mode Synchronous Buck PWM DC-DC Converter with Integrated Inductor
• Manufacturer: ENPIRION [Enpirion, Inc.]

Functional Block Diagram
Functional Description
Synchronous Buck Converter
The
programmable power supply with integrated
power MOSFET switches and integrated
inductor. The nominal input voltage range is
2.5V
programmed using an external resistor divider
network. The control loop is voltage-mode with
a type III compensation network. Much of the
compensation circuitry is internal to the device.
However, a phase lead capacitor is required
along with the output voltage feedback resistor
divider to complete the type III compensation
network. The device uses a low-noise PWM
topology and also integrates a unique light-load
mode (LLM) to improve efficiency at light
output load currents. LLM can be disabled with
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05991
to
EN6347QI
6.6V.
The
is
output
a
synchronous,
Figure 4: Functional Block Diagram
voltage
is
10/04/2011
8
a logic pin. Up to 4A of continuous output
current can be drawn from this converter. The
3 MHz switching frequency allows the use of
small size input / output capacitors, and
enables wide loop bandwidth within a small
foot print.
Protection Features:
The power supply has the following protection
features:
x Over-current protection (to protect the IC
x Thermal shutdown with hysteresis.
x Under-voltage lockout circuit to keep the
from excessive load current)
converter output off while the input voltage
is less than 2.3V.
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EN6347QI
Rev: B