EN5319QI
Functional Block Diagram
PVIN
POK
UVLO
POK
Thermal Limit
Current Limit
NC
(SW)
Soft Start
ENABLE
P-Drive
N-Drive
Logic
VOUT
PGND
(-)
PWM
Comp
(+)
Sawtooth
Generator
Compensation
Network
(-)
VFB
Error
Amp
(+)
DAC
VREF
BIAS
Package Boundary
TST
AGND
AVIN
Figure 4: Functional Block Diagram
Functional Description
Overview
impedance and excellent load transient response.
The EN5319QI features include Power OK, under
voltage lockout (UVLO), over current protection,
short circuit protection, and thermal overload
protection.
The EN5319QI is a highly integrated synchronous
buck converter with an internal inductor utilizing
advanced CMOS technology to provide high
switching frequency, while also maintaining high
efficiency. The EN5319QI is a high power density
device packaged in a tiny 4x6x1.1mm 24-pin QFN
package. Its high switching frequency allows for the
use of very small MLCC input and output filter
capacitors and results in a total solution size as
small as 50mm2.
The EN5319QI is a member of a family of pin
compatible devices. This offers scalability for
applications where load currents may not be known
apriori, and/or speeds time to market with a
convenient common solution footprint.
Stability and Compensation
The EN5319QI utilizes an internal compensation
network that is designed to provide stable operation
over a wide range of operating conditions. The
output compensation circuit may be customized to
improve transient performance or reduce output
voltage ripple with dynamic loads.
Soft-Start
The EN5319QI has an internal soft-start circuit that
controls the ramp of the output voltage. The control
circuitry limits the VOUT ramp rate to levels that are
safe for the Power MOSFETs and the integrated
inductor.
The EN5319QI buck converter uses Type III
voltage mode control to provide pin-point output
voltage accuracy, high noise immunity, low output
11
www.altera.com/enpirion
08325
October 16, 2015
Rev D
ALTERA [ ALTERA CORPORATION ]
