EN6347QI
Functional Block Diagram
Figure 4: Functional Block Diagram
Functional Description
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.
Synchronous Buck Converter
The
EN6347QI
is
a
synchronous,
programmable power supply with integrated
power MOSFET switches and integrated
inductor. The nominal input voltage range is
2.5V to 6.6V. The output voltage is
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
Protection Features:
The power supply has the following protection
features:
ꢁ Over-current protection (to protect the IC
from excessive load current)
ꢁ Thermal shutdown with hysteresis.
ꢁ Under-voltage lockout circuit to keep the
converter output off while the input voltage
is less than 2.3V.
@Enpirion 2011 all rights reserved, E&OE
8
www.enpirion.com
05991
10/04/2011
Rev: B
ENPIRION [ ENPIRION, INC. ]
