EN2360QI Datasheet, PDF (13/24 Pages) Enpirion, Inc. – 6A Voltage Mode Synchronous Buck PWM DC-DC Converter with Integrated Inductor

Functional Block Diagram
EN2360QI
UVLO
Thermal Limit
Current Limit
S_OUT S_IN
BTMP
PG
Digital I/O
To PLL
PVIN
Linear
Regulator
Gate Drive
10k
FADJ
(-)
PWM
Comp
(+)
PLL/Sawtooth
Generator
ENABLE
SS
180k
Soft Start
Compensation
Network
(-)
Error
Amp
(+)
Compensation
Network
Power
Good
Logic
Voltage Reference Generator
300k
AVINO
NC(SW)
VOUT
BGND
PGND
VDDB
EAIN
VFB
POK
Band Gap
Reference
AVIN
AGND
Figure 4: Functional Block Diagram
Functional Description
Synchronous Buck Converter
The EN2360QI is a highly integrated synchronous,
buck converter with integrated controller, power
MOSFET switches and integrated inductor. The
nominal input voltage (PVIN) range is 4.5V to 14V
and can support up to 6A of continuous output
current. The output voltage is programmed using
an external resistor divider network. The control
loop utilizes a Type IV Voltage-Mode compensation
network and maximizes on a low-noise PWM
topology. 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 IV
compensation network.. The high switching
frequency of the EN2360QI enables the use of
small size input and output capacitors, as well as a
wide loop bandwidth within a small foot print.
Protection Features:
The power supply has the following protection
features:
• Programmable Over-Current Protection
• Thermal Shutdown with Hysteresis.
• Under-Voltage Lockout Protection
Additional Features:
• Switching Frequency Synchronization.
• Programmable Soft-Start
• Power OK Output Monitoring
©Enpirion 2012 all rights reserved, E&OE
07514
Enpirion Confidential
September 17, 2012
www.enpirion.com, Page 13
Rev: A