Microchip MIC2128 Manual de Usario

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2016-2020 Microchip Technology Inc. DS20005620F-page 1
MIC2128
Features
Hyper Speed Control® Architecture Enables:
- High Input to Output Voltage Conversion
Ratio Capability
- Any Capacitor™ Stable
- Ultra-Fast Load Transient Response
Wide 4.5V to 75V Input Voltage Range
Adjustable Output Voltage from 0.6V to 30V
270 kHz to 800 kHz Programmable Switching
Frequency
Built-in 5V Regulator for Single-Supply Operation
Auxiliary Bootstrap LDO for Improving System
Efficiency
Internal Bootstrap Diode
Adjustable Soft Start Time
Enable Input and Power Good Output
Programmable Current Limit
Hiccup Mode Short-Circuit Protection
Internal Compensation and Thermal Shutdown
Supports Safe Start-Up into a Prebiased Output
AEC-Q100 Qualified (VAO suffix)
Applications
Networking/Telecom Equipment
Base Station, Servers
Distributed Power Systems
Industrial Power Supplies
Automotive Power Supplies
General Description
The MIC2128 is a constant-frequency synchronous
buck controller featuring a unique adaptive on-time
control architecture with external soft start. The
MIC2128 operates over an input voltage range from
4.5V to 75V.The output voltage is adjustable down to
0.6V with a guaranteed accuracy of ±1%. The device
operates with programmable switching frequency from
270 kHz to 800 kHz.
The MIC2128 features an external soft start pin (SS)
which allows the user to adjust output soft start time to
reduce inrush current from mains during start-up. The
MIC2128 features an auxiliary bootstrap LDO which
improves the system efficiency by supplying the
MIC2128 internal circuit bias power and gate drivers
from output of the converter. A logic level enable (EN)
signal can be used to enable or disable the controller.
The MIC2128 can start-up monotonically into a
prebiased output. The MIC2128 features an open drain
power good signal (PG) which signals when the output
is in regulation and can be used for simple power
supply sequencing purpose.
The MIC2128 offers a full suite of protection features to
ensure protection of the IC during Fault conditions.
These include undervoltage lockout to ensure proper
operation under power-sag conditions, “hiccupmode
short-circuit protection and thermal shutdown.
The MIC2128 is available in a 16-pin 3 mm x 3 mm
VQFN package, with an operating junction temperature
range from -40°C to +125°C.
Typical Application Circuit
PVDD
VDD
PG
EN
SS
FREQ EXTVDD
FB
ILIM
SW
BST
VIN VIN
4.5V to 75V
VOUT
5V@5A
VOUT
VIN
4.7 µF
2.2 µFX3
47 µF
10 µH
0.1 µF
0.1 µF
4.7 nF
1 µF
4.7 µF
2.2ё
18 kё
7.5 kё
1 kё
100 kё
60 kё
1.5 kё
VIN
MIC2128
PGND
AGND
DH
DL
10 nF
330 µF
+
0.1 µF
Q1
Q2
L1
C1
Q1,Q2:SiR878ADP
L1: SRP1265A-100M, Bourns
C1: 10SVP330M
75V, Synchronous Buck Controller Featuring Adaptive
On-Time Control with External Soft Start
MIC2128
DS20005620F-page 2 2016-2020 Microchip Technology Inc.
Package Type
Functional Block Diagram
2
SW
BST
PG SS
FREQ
DH
EN
PGND
DL
PVDD
EXTVDD
VIN
VDD
AGND
FB
ILIM
16
1
15 14 13
3
4
11
10
9
5 6 7 8
12
MIC2128
3 x 3 VQFN* (Top View)
EP
* Includes Exposed Thermal Pad (EP); see Table 3-1.
SW
PG
VDD
BST
PVDD
FREQ
PVDD VIN
PGND
ILIM
Negative Current
Limit
815
THERMAL
SHUTDOWN
11 T
ON
ESTIMATION
Control
Logic
14
1
AGND
EN
10
2
9
EXTVDD
LINEAR
REGULATOR
g
m
13
FB
COMPENSATION
VREF
FB
5
DH
7
DL
12
SS
3
4
16
CURRENT LIMIT
DETECTION
0.9
µA
UVLO
LINEAR
REGULATOR
0.6V
V
REF
1.3 µA
6
2016-2020 Microchip Technology Inc. DS20005620F-page 3
MIC2128
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
VIN, FREQ, ILIM, SW to PGND .................................................................................................................... –0.3V to +76V
VSW to PGND (Transient < 50 ns) ............................................................................................................................... –5V
VDD, PVDD, FB, PG, SS to A
GND ................................................................................................................. 0.3V to +6V
EXTVDD to AGND ...................................................................................................................................... –0.3V to +16V
BST to SW .................................................................................................................................................. –0.3V to +6V
BST to AGND ............................................................................................................................................. –0.3V to +82V
EN to AGND ...................................................................................................................................... –0.3V to (V
IN +0.3V)
DH, DL to AGND.............................................................................................................................. –0.3V to (V
DD +0.3V)
PGND to AGND........................................................................................................................................... –0.3V to +0.3V
Junction Temperature........................................................................................................................................... +150°C
Storage Temperature (TS)..................................................................................................................... 65°C to +150°C
Lead Temperature (soldering, 10s) ........................................................................................................................ 260°C
ESD Rating( )1......................................................................................................................................................... 1000V
Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 k in series with
100 pF.
Operating Ratings( )1
Supply Voltage (VIN) ..................................................................................................................................... 4.5V to 75V
SW, FREQ, ILIM, EN........................................................................................................................................... 0V to V
IN
EXTVDD ....................................................................................................................................................... 0V to 13.2V
Junction Temperature (TJ)..................................................................................................................... 40°C to +125°C
Package Thermal Resistance (3 mm × 3 mm QFN-16)
Junction to Ambient (JA) .................................................................................................................................. 50.8°C/W
Junction to Case (JC)....................................................................................................................................... 25.3°C/W
Note 1: The device is not ensured to function outside the operating range.
Notice: Stresses above those listed under “Maximum Ratingsmay cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods
may affect device reliability.

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: MIC2128
Color del producto: Zwart
Ancho: 140 mm
Profundidad: 150 mm
Altura: 86 mm
Nivel de ruido: - dB
Actual: 4 - 8 A
Certificación: TUV, cTUVus, CE, FCC, BSMI
Destinado a: PC
numero de fans: 1 ventilator(en)
Protección de voltaje de energía: Over power, Over voltage, Short circuit, Overheating
Certificación 80 PLUS: 80 PLUS
Tiempo medio entre fallos (MTBF): 100000 uur
Los activos totales: 400 W
Factor de potencia: 0.9
Tipo de enfriamiento: Actief
Eficiencia: 75 procent
voltaje-de-entrada-de-CA: 100 - 240 V
Frecuencia-de-entrada-de-CA: 50 - 60 Hz
Temperatura de funcionamiento (TT): 10 - 40 °C
Diámetro del ventilador: 120 mm
Conexión para unidad de disquete: Ja
Factores de forma de placa base compatibles: ATX
Conector de alimentación de la placa base: 20+4 pin ATX
Conectores de alimentación de periféricos (Molex) (4 pines): 3
Factor de forma de fuente de alimentación (PSU): ATX
Tipo de corrección del factor de potencia (PFC): Actief
Potencia combinada (+3,3V): 100 W
Potencia combinada (+12V): 360 W
Potencia combinada (+5V): 100 W
Salida máxima de audio (+3,3 V): 14 A
Salida de corriente máxima (+12 V): 30 A
Salida máxima de audio (+5V): 14 A
Salida de corriente máxima (-12V): 0.3 A
Salida de corriente máxima (+5Vsb): 2.5 A
Potencia combinada (-12V): 3.6 W
Potencia combinada(+5Vsb): 12.5 W
Número de conectores de alimentación SATA: 6
Conector de alimentación de la unidad de disquete: 1
Versión ATX: 2.31
Hora de espera: 10 ms
Conectores de alimentación PCI Express (6+2 pines): 1
Conector de alimentación de la CPU (4+4 pines): Ja
Conector de alimentación ATX (20+4 pines): Ja
Longitud del cable de alimentación SATA: 870 mm
Longitud del cable de alimentación de la placa base: 500 mm
Longitud del cable de alimentación PCI Express: 550 mm
Longitud del cable de alimentación de la CPU: 550 mm
Rango de retardo Potencia Buena señal: 100 - 500 ms

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