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  Microchip Technology Semiconductor Electronic Components Datasheet  

MIC28511 Datasheet

3A Synchronous Buck Regulator

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MIC28511
60VIN, 3A Synchronous Buck Regulator
Features
• 4.6V to 60V Operating Input Voltage Supply
• Up to 3A Output Current
• Integrated High-Side and Low-Side N-Channel
MOSFETs
• HyperLight Load (MIC28511-1) and Hyper Speed
Control (MIC28511-2) Architecture
• Enable Input and Power Good (PGOOD) Output
• Programmable Current-Limit and Foldback
“Hiccup” Mode Short-Circuit Protection
• Built-In 5V Regulator for Single-Supply Operation
• Adjustable 200 kHz to 680 kHz Switching
Frequency
• Fixed 5 ms Soft-Start
• Internal Compensation and Thermal Shutdown
• Thermally-Enhanced 24-Pin 3 mm x 4 mm FQFN
Package
• –40°C to +125°C Junction Temperature Range
Applications
• Industrial Power Supplies
• Distributed Supply Regulation
• Base Station Power Supplies
• Wall Transformer Regulation
• High-Voltage Single-Board Systems
General Description
The MIC28511 is a synchronous step-down switching
regulator with internal power switches capable of
providing up to 3A output current from a wide input
supply range from 4.6V to 60V. The output voltage is
adjustable down to 0.8V with a guaranteed accuracy of
±1%. A constant switching frequency can be
programmed from 200 kHz to 680 kHz. The Hyper
Speed Control® and HyperLight Load® architectures of
the MIC28511 allow for high VIN (low VOUT) operation
and ultra-fast transient response while reducing the
required output capacitance and providing very good
light-load efficiency.
The MIC28511 offers a full suite of features to ensure
protection under fault conditions. These include
undervoltage lockout to ensure proper operation under
power sag conditions, internal soft-start to reduce
inrush current, foldback current-limit, “hiccup” mode
short-circuit protection and thermal shutdown.
Package Type
MIC28511
24-Pin 3 mm x 4 mm FQFN (FL)
DL 1
PGND 2
DH 3
PVIN 4
LX 5
BST 6
PVIN 7
PVIN 8
24 23 22 21
9 10 11 12
20 PVDD
19 VDD
18 ILIM
17 VIN
16 EN
15 PGOOD
14 FB
13 AGND
2016 Microchip Technology Inc.
DS20005520A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MIC28511 Datasheet

3A Synchronous Buck Regulator

No Preview Available !

MIC28511
Typical Application Circuit
MIC28511
3x4 FQFN
VIN
5.5V – 60V
100kŸ
4.7μF
100kŸ
VDD PVDD
10Ÿ
BST
2.2μF
EN
PVIN
VIN
MIC28511
2.2kŸ
ILIM
SW
0.1μF
6.8μH
100kŸ
10kŸ
FREQ
FB
GND
0.1μF
1.91kŸ
PGND
VOUT
5V (0A TO 3A)
470pF
47μF
×2
Functional Block Diagram
VIN
CVDD
VIN
17
VDD PVDD
19 20
LINEAR
REGULATOR
UVLO
DBST
PVIN
4, 7, 8, 9, 25
BST
6
RBST
3 DH
CIN
OFF ON
16
R3 EN
24
R4 FREQ
3.3V
THERMAL
SHUTDOWN
FIXED TON
ESTIMATION
SOFT-START
CONTROL ZCD
LOGIC
PVDD
RPGOOD
15
PGOOD
POWER GOOD
COMPARATOR
CURRENT
LIMIT
DETECTION
X90%
VREF
0.8V
13
AGND
14
FB
M1
12, SW
21,
27
CBST
L
LX
5
1 DL
M2 RLIM
PGND
10,
11,
22,
23,
26
RINJ
COUT
2
PGND
18
ILIM
CINJ
R1
VOUT
CFF
R2
DS20005520A-page 2
2016 Microchip Technology Inc.


Part Number MIC28511
Description 3A Synchronous Buck Regulator
Maker Microchip
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MIC28511 Datasheet PDF






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