MIC28303 Datasheet, PDF (1/38 Pages) Microchip Technology – 50V, 3A Power Module

MIC28303
50V, 3A Power Module
Features
• Easy to Use
- Stable with low-Equivalent Series Resistance
(ESR) ceramic output capacitor
- No Inductor and No Compensation to
Choose
• 4.5V to 50V Input Voltage
• Single-Supply Operation
• Power Good (PG) Output
• Low Radiated Emission (EMI) per EN55022, Class B
• Adjustable Current Limit
• Adjustable Output Voltage from 0.9V to 24V (Also
Limited by Duty Cycle)
• 200 kHz to 600 kHz, Programmable Switching
Frequency
• Supports Safe Start-Up into a Prebiased Output
• –40°C to +125°C Junction Temperature Range
• Available in 64-pin, 12 mm × 12 mm × 3 mm QFN
Package
Applications
• Distributed Power Systems
• Industrial
• Medical
• Telecom
• Automotive
General Description
MIC28303 is synchronous step-down regulator
module, featuring a unique adaptive ON-time control
architecture. The module incorporates a DC/DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor and an inductor in a single package. The
MIC28303 operates over an input supply range from
4.5V to 50V and can be used to supply up to 3A of
output current. The output voltage is adjustable down
to 0.8V with an accuracy of ±1%. The device operates
with programmable switching frequency from 200 kHz
to 600 kHz.
The MIC28303-1 uses HyperLight Load^® architecture
for improved efficiency at light loads. The MIC28303-2
uses Hyper Speed Control^® for ultra-fast transient
response.
The MIC28303 offers a full suite of protection features.
These include undervoltage lockout, internal soft-start,
foldback current limit, “hiccup” mode short-circuit
protection, and thermal shutdown.
Typical Application Circuit
MIC28303
12x12 QFN
EN
R19
75kΩ
PG
PVDD ANODE BSTC BSTR
PVIN
VIN
EN
FREQ
VOUT
MIC28303
SW
ILIM
FB
PGOOD
GND PGND
VIN
4.5V to 50V
C2,C3
2.2μF
C1
100μF
R3
16.5kΩ _R1
10kΩ
R15
3.57kΩ C10
0.1μF
C12
2.2nF
C14
47μF
V_OUT
5V/3A
R11
1.91kΩ
C6
10pF
GND
 2016 Microchip Technology Inc.
DS20005464A-page 1