• 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
Control
®
General Description
The MIC2127A is a constant-frequency synchronous
buck controller featuring a unique adaptive on-time
control architecture. The MIC2127A 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-800 kHz.
The MIC2127A features a MODE pin that allows the
user to select either Continuous Conduction mode or
Hyper Light 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. The MIC2127A can start-up
monotonically into a prebiased output. The MIC2127A
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.
The 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 5 ms to
reduce inrush current during start-up and thermal shut-
down.
The MIC2127A is available in a 16-pin 3 mm x 3 mm
VQFN package, with an operating junction temperature
range from –40°C to +125°C.
Applications
•
•
•
•
Networking/Telecom Equipment
Base Station, Servers
Distributed Power Systems
Industrial Power Supplies
Typical Application
P
VDD
4.7 μF
DH
10
V
DD
4.7 μF
BST
0.1 μF
SW
L1
10 μH
+ C1
330 μF
1.3 k
Q2
DL
V
IN
V
DD
MODE
FB
1k
100 k
V
IN
60 k
FREQ
A
GND
P
GND
EXTVDD
1 μF
V
OUT
EN
36 k
7.5 k
4.7 nF
0.1 μF
V
IN
0.1 μF
Q1
V
IN
*
4.5V to 75V
2.2 μFX3
MIC2127A
PG
V
OUT
5V@5A
47 μF
I
LIM
Q1,Q3: SiR878ADP
L1: SRP1265A-100M, Bourns
C1: 10SVP330M
*Output voltage follows input voltage when the input is below the target output voltage
2016 Microchip Technology Inc.
DS20005676B-page 1
MIC2127A
Package Types
MIC2127A
3 x 3 VQFN*
(Top View)
A
GND
7
DL
V
DD
V
IN
FB
12 MODE
EP
11 FREQ
10 EN
9 EXTVDD
5
DH
6
P
GND
8
P
VDD
P
VDD
8
16 15 14 13
PG 1
I
LIM
2
SW 3
BST 4
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
Functional Block Diagram
V
DD
15
EXTVDD
9
EN
10
V
IN
16
UVLO
LINEAR
REGULATOR
LINEAR
REGULATOR
4
BST
THERMAL
SHUTDOWN
MODE
12
5
DH
FREQ
11
T
ON
ESTIMATION
Control
Logic
Zero Crossing
Detection (ZCD) and
Negative Current Limit
3
SW
COMPENSATION
P
VDD
FB
13
g
m
7
DL
Soft
Start
V
REF
0.6V
CURRENT
LIMIT
DETECTION
100 µA
2
I
LIM
PG
1
0.9
V
REF
6
FB
P
GND
14
A
GND
DS20005676B-page 2
2016 Microchip Technology Inc.
MIC2127A
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
V
IN
, FREQ
,
I
LIM
, SW to P
GND
.................................................................................................................... –0.3V to +76V
V
DD
, P
VDD
, FB, PG, MODE to A
GND
........................................................................................................... –0.3V to +6V
EXTVDD to A
GND
...................................................................................................................................... –0.3V to +16V
BST to SW .................................................................................................................................................. –0.3V to +6V
BST to A
GND
............................................................................................................................................. –0.3V to +82V
EN to A
GND
...................................................................................................................................... –0.3V to (V
IN
+0.3V)
DH, DL to A
GND
............................................................................................................................. –0.3V to (V
DD
+0.3V)
P
GND
to A
GND
.......................................................................................................................................... –0.3V to +0.3V
Junction Temperature .......................................................................................................................................... +150°C
Storage Temperature (T
S
) ..................................................................................................................... –65°C to +150°C
Lead Temperature (soldering, 10s) ........................................................................................................................ 260°C
Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods
may affect device reliability.
Note 1:
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 k in series with
100 pF.
Operating Ratings
(1)
Supply Voltage (V
IN
) ..................................................................................................................................... 4.5V to 75V
SW, FREQ, I
LIM
, EN........................................................................................................................................... 0V to V
IN
Junction Temperature (T
J
) .................................................................................................................... –40°C to +125°C
Package Thermal Resistance (3 mm × 3 mm VQFN 16LD)
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