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  Microchip Technology Semiconductor Electronic Components Datasheet  

MIC28513 Datasheet

4A Synchronous Buck Regulator

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MIC28513
45V, 4A Synchronous Buck Regulator
Features
• 4.6V to 45V Operating Input Voltage Supply
• Up to 4A Output Current
• Integrated High-Side and Low-Side N-Channel
MOSFETs
• HyperLight Load (MIC28513-1) and Hyper Speed
Control (MIC28513-2) 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 MIC28513 is a synchronous step-down switching
regulator with internal power switches capable of
providing up to 4A output current from a wide input
supply range from 4.6V to 45V. 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
MIC28513’s Hyper Speed Control® and HyperLight
Load® architectures allow for high VIN (low VOUT)
operation and ultra-fast transient response while
reducing the required output capacitance. The
MIC28513-1’s HyperLight Load architecture also
provides very good light load efficiency.
The MIC28513 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
MIC28513
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.
DS20005522A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MIC28513 Datasheet

4A Synchronous Buck Regulator

No Preview Available !

MIC28513
Typical Application Circuit
MIC28513
3x4 FQFN
VIN
5.5V to 45V
100kΩ
100kΩ
VDD PVDD
BST
10Ω
2.2μF
MIC28513
EN
PVIN
VIN
ILIM
SW
LX
2.2kΩ
0.1μF
6.8μH
100kΩ
FREQ
0.1μF
FB
10.0kΩ
AGND
1.91kΩ
VOUT
5V (0A to 4A)
470pF
47μF x2
PGND
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
DS20005522A-page 2
2016 Microchip Technology Inc.


Part Number MIC28513
Description 4A Synchronous Buck Regulator
Maker Microchip
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MIC28513 Datasheet PDF






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