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MCP19035-AAAAE/MF 数据表(PDF) 13 Page - Microchip Technology

部件名 MCP19035-AAAAE/MF
功能描述  High-Speed Synchronous Buck Controller
PDF  44 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP19035-AAAAE/MF 数据表(HTML) 13 Page - Microchip Technology

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 2012-2013 Microchip Technology Inc.
DS22326B-page 13
MCP19035
4.0
DETAILED DESCRIPTION
4.1
Device Overview
The
MCP19035
family
of
devices
are
high-
performance controllers providing all the necessary
functions to construct a high-performance DC/DC
converter, while keeping costs and design effort to a
minimum:
• Support for pre-biased outputs eliminates con-
cerns about damaging sensitive loads during
startup.
• Strong gate drivers for the high-side and rectifier
N-Channel MOSFETs decrease switching losses,
yielding increases in efficiency.
• Adaptive gate drive timing prevents shoot-through
and minimizes body diode conduction in the syn-
chronous rectifier MOSFET, which also increases
the efficiency.
• Dead-Time optimization options of the MCP19035
assist in improving the power conversion effi-
ciency, when used with high-speed, low Figure of
Merit MOSFETs.
• Overcurrent protection circuits in both high and
low-side switches, and a short circuit hiccup-
recovery mode increase design flexibility and min-
imize power dissipation in the event of prolonged
output faults.
• The dedicated SHDN pin allows the converter to
be placed in a low quiescent current state.
• Internal fixed converter switching frequency and
soft-start reduce the external component count,
simplifying design and layout, as well as reducing
footprint and size.
• The 3 mm × 3 mm DFN package size also mini-
mizes the overall converter footprint.
FIGURE 4-1:
Internal Block Diagram.
HDRV
LDRV
Oscillator
BOOT
Control
Logic
SHDN
VIN
PWRGD
COMP
FB
PHASE
Cross
Conduction
Protection
HD
LD
Voltage
Regulator
Comp
Dead
Time
Generator
+
-
VCC
Power-Good
Circuit
Shut-Down
Circuit
+
-
SD
EA
SD
UVLO
Circuit
Over-Current
Detection Circuit
Reference
Voltage
Generator
Soft Start
Circuit
FB
SD
GND
VREF
PWM
Over-Temperature
Detection Circuit
OT
OT
VIN
VCC
VCC
VCC
VCC



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