Microchip MIC2127A Bedienungsanleitung
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2016-2020 Microchip Technology Inc.DS20005676F-page 1
MIC2127A
Features
•Hyper Speed Control®Architecture Enables:
-High input to output voltage conversion ratio
capability
-Any Capacitor™ stable
-Ultra-fast load transient response
•Wide 4.5V-75V Input Voltage Range
•Adjustable Output Voltage from 0.6V to 30V
•270kHz-800kHz Programmable Switching
Frequency
•Built-In 5V Regulator for Single-Supply Operation
•Auxiliary Bootstrap LDO for Improving System
Efficiency
•Internal Bootstrap Diode
•Selectable Light Load Operating Mode
•Enable Input and Power Good Output
•Programmable Current Limit
•Hiccup Mode Short-Circuit Protection
•Soft Start, Internal Compensation and Thermal
Shutdown
•Supports Safe Start-Up into a Prebiased Output
•AEC-Q100 Qualified (VAO suffix)
Applications
•Networking/Telecom Equipment
•Base Station, Servers
•Distributed Power Systems
•Industrial Power Supplies
•Automotive Power Supplies
General Description
The MIC2127A device is a constant-frequency
synchronous buck controller featuring a unique
adaptive on-time control architecture. The MIC2127A
device operates over an input voltage range from
4.5V-75V. The output voltage is adjustable down to
0.6V with an accuracy of ±1%. The device operates
with programmable switching frequency from 270 kHz
to 800kHz.
The MIC2127A device features a MODE pin that allows
the user to select either Continuous Conduction mode
or HyperLight Load® (HLL) mode under light loads. An
auxiliary bootstrap LDO improves the system efficiency
by supplying the MIC2127A internal circuit bias power
and gate drivers from the output of the converter. A
logic level enable (EN) signal can be used to enable or
disable the controller. MIC2127A can start-up
monotonically into a prebiased output. The MIC2127A
device features an open drain power good signal (PG)
that signals when the output is in regulation and can be
used for simple power supply sequencing.
MIC2127A offers a full suite of protection features to
ensure protection of the IC during Fault conditions.
These include undervoltage lockout to ensure proper
operation under power-sag conditions, “hiccup” mode
short-circuit protection, internal soft start of 5ms to
reduce inrush current during start-up and thermal shut-
down.
The MIC2127A device is available in a 16-pin
3 mm×3 mm VQFN package, with an operating
junction temperature range from –40°C to +125°C.
Typical Application Circuit
PVDD
VDD
PG
EN
MODE
FREQ EXTVDD
FB
ILIM
SW
BST
VIN VIN
4.5V*
to 75V
VOUT
5V@5A
VOUT
VIN
4.7 μF
2.2 μFX3
47 μF
10 μH
0.1 μF
0.1 μF
4.7 nF
1 μF
4.7 μF
10
36 k
7.5 k
1 k
100 k
60 k
1.3 k
VIN
MIC2127A
PGND
AGND
DH
DL
330 μF
+
0.1 μF
Q1
Q2
Q1,Q3: SiR878ADP
L1: SRP1265A-100M, Bourns
C1: 10SVP330M
*Output voltage follows input voltage when the input is below the target output voltage
L1
C1
VDD
75V, Synchronous Buck Controller Featuring Adaptive
On-Time Control
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MIC2127A |
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