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PDF MIC28511 Data sheet ( Hoja de datos )
| Número de pieza | MIC28511 | |
| Descripción | 3A Synchronous Buck Regulator | |
| Fabricantes | Microchip | |
| Logotipo |  |
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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
1 page  
MIC28511
TABLE 1-1: ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = 12V, TA = 25°C, unless noted. Bold values indicate –40°C ≤ TJ ≤ +125°C.
(Note 1).
Parameters
Min.
Typ.
Max.
Units
Conditions
Leakage
SW, BST Leakage Current
——
50
µA —
Power Good (PGOOD)
PGOOD Threshold Voltage
PGOOD Hysteresis
PGOOD Delay Time
PGOOD Low Voltage
Thermal Protection
Overtemperature Shutdown
Overtemperature Shutdown
Hysteresis
85 90
95 %VOUT Sweep VFB from low to high
—6
—
Sweep VFB from low to high
— 100
—
µs Sweep VFB from low to high
— 70 200 mV VFB < 90% x VNOM, IPGOOD = 1 mA
— 160
— 15
—
—
°C TJ Rising
°C —
Soft-Start
Soft-Start Time
— 5 — ms —
Note 1: Specification for packaged product only.
2016 Microchip Technology Inc.
DS20005520A-page 5
5 Page 
MIC28511
FIGURE 2-25:
Output Voltage vs. Output
Current (MIC28511-2).
FIGURE 2-28:
Efficiency (VIN = 48V) vs.
Output Current (MIC28511-2).
FIGURE 2-26:
Efficiency (VIN = 12V) vs.
Output Current (MIC28511-2).
FIGURE 2-29:
Switch Frequency vs.
Output Current (MIC28511-2).
FIGURE 2-27:
Efficiency (VIN = 24V) vs.
Output Current (MIC28511-2).
FIGURE 2-30:
IC Power Dissipation vs.
Output Current (MIC28511-2).
2016 Microchip Technology Inc.
DS20005520A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC28511.PDF ] | |
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