regulator. The MIC24045 is perfectly suited for multiple
voltage rail application environments, typically found in
computing and telecommunication systems. In the
MIC24045 various parameters can be programmed via
I
2
C, such as output voltage, switching frequency,
soft-start slope, margining, current limit values and
start-up delays. The wide switching frequency adjust-
ment range, valley current-mode control technique,
high-performance error amplifier and external compen-
sation allow for the best trade-offs between high effi-
ciency and the smallest possible solution size.
The MIC24045 supports extensive diagnostics and
status information through I
2
C.
The MIC24045 pinout is compatible with the MIC24046
pin-strapping programmable regulator pinout, such that
I
2
C-based implementations can be easily converted
into pin-programmable ones.
The MIC24045 is available in a thermally efficient,
space-saving 20-pin 3 mm x 3 mm FQFN package,
with an operating junction temperature range from
–40°C to +125°C.
•
•
•
•
•
Applications
• Servers, Data Storage, Routers and Base
Stations
• FPGAs, DSP, and Low-Voltage ASIC Power
Typical Application Circuit
V
DDA
V
IN
4.5V to 19V
V
IN
V
INLDO
V
DDA
A
GND
BST
V
OUT
0.64V to 5.25V
LX
P
GND
OUTSNS
V
DDP
COMP
MIC24045
V
DDA
I
2
C
SDA
SCL
V
DDA
P
GOOD
ENABLE
PG
EN
ADR0
ADR1
Address
Selection
2016-2018 Microchip Technology Inc.
DS20005568B-page 1
MIC24045
Package Type
MIC24045
3 x 3 FQFN*
(Top View)
OUTSNS
15 COMP
14 A
GND
13 P
GND
12 SDA
11 SCL
9 10
ADR0
ADR1
V
DDA
Linear
Regulator
UVLO
HS
LX
LX_EP
LS
P
GND
P
GND
_EP
I
SENSE
Soft-
Start
R2
REF
DAC
CLK
SLOPE
V
INLDO
V
DDP
7
BST
V
DDA
8
PG
20 19 18 17 16
V
IN
1 21 V
IN_
EP
V
IN
2
P
GND
3 22 P
GND_
EP
P
GND
4
LX 5 23 LX_EP
6
LX
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
Functional Block Diagram
EN
2 µA
V
INLDO
V
DDP
BST
V
IN
V
IN
_EP
EN
10O
High-Side
Current
Limit
Reference and
DAC
REF
DAC
UVLO
V
DDA
1.21V
UVLO
Enable
Comparator
Thermal
Shutdown and
Warning
ADR0
ADR1
SCL
SDA
V
OUT
<7:0> POR
ThSD,
ThWrn
Ilim<1:0>
Freq<2:0>
SS<1:0>
V
OUT
RANGE
Control Logic/
Valley Current Mode
Modulator
Gate
Drive
I
2
C
Interface
and
Registers
Low-Side
ISense
Low-Side
Current
Limit
OUTSNS
PG
Current
Limit
DLY
Power-Good
Comparator
R1
Gm
Error
Amplifier
Oscillator
and
Slope
Compensation
V
IN
OUTSNS
A
GND
COMP
DS20005568B-page 2
2016-2018 Microchip Technology Inc.
MIC24045
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
V
IN
, V
INLDO,
V
LX
to A
GND
............................................................................................................................ –0.3V to +20V
V
DDP
, V
DDA
to A
GND
..................................................................................................................................... –0.3V to +6V
V
INLDO
to V
DDA
.......................................................................................................................................... –0.3V to +20V
V
DDP
to V
DDA
............................................................................................................................................ –0.3V to +0.3V
V
ADRx
, V
SDA,
V
SCL
to A
GND
......................................................................................................................... –0.3V to +6V
V
BST
to V
LX
.................................................................................................................................................. –0.3V to +6V
V
BST
to A
GND
............................................................................................................................................. –0.3V to +26V
V
EN
to A
GND
...............................................................................................................................–0.3V to V
DDA
+0.3V,+6V
V
PG
to A
GND
................................................................................................................................................. –0.3V to +6V
V
COMP,
V
OUTSNS
to A
GND
..........................................................................................................–0.3V to V
DDA
+0.3V,+6V
A
GND
to P
GND
........................................................................................................................................... –0.3V to +0.3V
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,
V
INLDO
) ..................................................................................................................... +4.5V to +19V
Externally Applied Analog and Drivers Supply Voltage (V
INLDO
= V
DDA
= V
DDP
) .................................... +4.5V to +5.5V
Enable Voltage (V
EN
) ..................................................................................................................................... 0V to V
DDA
Power-Good (PG) Pull-up Voltage (V
PU_PG
)................................................................................................. 0V to +5.5V
Output Current ............................................................................................................................................................. 5A
Note 1:
The device is not ensured to function outside the operating range.
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Analog electronics
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