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PDF MIC2125 Data sheet ( Hoja de datos )
| Número de pieza | MIC2125 | |
| Descripción | 28V Synchronous Buck Controllers | |
| Fabricantes | Microchip | |
| Logotipo |  |
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MIC2125/6
28V Synchronous Buck Controllers
Featuring Adaptive ON-Time Control
Features
• Hyper Speed Control Architecture Enables:
- High delta V operation (VIN = 28V and VOUT
= 0.6V)
- Any Capacitor™ stable
• 4.5V to 28V Input Voltage
• Adjustable Output Voltage from 0.6V to 24V
• 200 kHz to 750 kHz Programmable Switching
Frequency
• HyperLight Load® (MIC2125)
• Hyper Speed Control® (MIC2126)
• Enable Input and Power Good Output
• Built-in 5V Regulator for Single-Supply Operation
• Programmable current limit and “hiccup” mode
short-circuit protection
• 7 ms internal soft-start, internal compensation,
and thermal shutdown
• Supports Safe Start-Up into a Prebiased Output
• –40°C to +125°C Junction Temperature Range
• Available in 16-pin, 3 mm × 3 mm QFN Package
Applications
• Networking/Telecom Equipment
• Base Stations, Servers
• Distributed Power Systems
• Industrial Power Supplies
General Description
The MIC2125 and MIC2126 are constant-frequency
synchronous buck controllers featuring a unique
adaptive ON-time control architecture. The MIC2125/6
operate over an input voltage range from 4.5V to 28V
and can be used to supply load current up to 25A. The
output voltage is adjustable down to 0.6V with a
guaranteed accuracy of ±1%. The device operates with
programmable switching frequency from 200 kHz to
750 kHz.
HyperLight Load® architecture provides the same high
efficiency and ultra-fast transient response as the
Hyper Speed Control® architecture under medium to
heavy loads. It also maintains high efficiency under
light load conditions by transitioning to variable
frequency, discontinuous conduction mode operation.
The MIC2125/6 offer a full suite of features to ensure
protection of the IC during fault conditions. These
include undervoltage lockout to ensure proper
operation under power-sag conditions, internal
soft-start to reduce inrush current, “hiccup” mode
short-circuit protection, and thermal shutdown.
Package Type
MIC2125/6
16-Pin 3 mm x 3 mm QFN (ML)
16 15 14 13
VDD 1
PVDD 2
ILIM 3
DL 4
EP 17
12 AGND
11 NC
10 OVP
9 BST
56 78
2015 Microchip Technology Inc.
DS20005459B-page 1
1 page  
MIC2125/6
TABLE 1-1: ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = 12V, VOUT = 1.2V, VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate
–40°C ≤ TJ ≤ +125°C. (Note 1).
Parameters
Min.
Typ.
Max.
Units
Conditions
Overvoltage Protection
Threshold
——
0.62
—
V—
FET Drivers
DH, DL Output Low Voltage
DH, DL Output High Voltage
DH On-Resistance, High State
DH On-Resistance, Low State
DL On-Resistance, High State
DL On-Resistance, Low State
SW, BST Leakage Current
—
VPVDD-0.1
or
VBST-0.1
—
—
—
—
—
—
—
2.5
1.6
1.9
0.55
—
0.1
—
—
—
—
—
50
V ISINK = 10 mA
ISOURCE = 10 mA
Ω—
—
—
—
µA —
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
85 89
95 %VOUT Sweep VFB from low to high
—6
—
Sweep VFB from high to low
— 80 — µs Sweep VFB from low to high
— 60 200 mV VFB < 90% x VNOM, IPG = 1 mA
Thermal Protection
Overtemperature Shutdown
Overtemperature Shutdown
Hysteresis
— 150
— 15
—
—
°C TJ Rising
°C —
Note 1:
2:
Specification for packaged product only.
The application is fully functional at low VDD (supply of the control section) if the external MOSFETs have
low voltage VTH.
2015 Microchip Technology Inc.
DS20005459B-page 5
5 Page 
MIC2125/6
Note: Unless otherwise noted, VIN = 12V, FREQ = 350 kHz.
*Note: For Case Temperature graphs: The temperature measurement was taken at the hottest point on the MIC2125/6
case mounted on a 5 square inch PCBn. Actual results will depend upon the size of the PCB, ambient temperature and
proximity to other heat emitting components.
FIGURE 2-25:
Case Temperature* vs.
Output Current (MIC2125).
FIGURE 2-28:
Efficiency (VIN = 18V) vs.
Output Current (MIC2125).
FIGURE 2-26:
Efficiency (VIN = 5V) vs.
Output Current (MIC2125).
FIGURE 2-29:
Efficiency (VIN = 5V) vs.
Output Current (MIC2126).
FIGURE 2-27:
Efficiency (VIN = 12V) vs.
Output Current (MIC2125).
FIGURE 2-30:
Efficiency (VIN = 12V) vs.
Output Current (MIC2126).
2015 Microchip Technology Inc.
DS20005459B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC2125.PDF ] | |
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