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PDF MIC2128 Data sheet ( Hoja de datos )
| Número de pieza | MIC2128 | |
| Descripción | Synchronous Buck Controller | |
| Fabricantes | Microchip | |
| Logotipo |  |
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MIC2128
75V, Synchronous Buck Controller Featuring Adaptive
On-Time Control with External Soft Start
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
Applications
• Networking/Telecom Equipment
• Base Station, Servers
• Distributed Power Systems
• Industrial 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, “hiccup” mode
short-circuit protection and thermal shutdown.
The MIC2128 is available in a 16-pin 3 mm x 3 mm
QFN package, with an operating junction temperature
range from -40°C to +125°C.
Package Types
MIC2128
3 x 3 QFN*
(Top View)
16 15 14 13
PG 1
ILIM 2
SW 3
BST 4
12 SS
11 FREQ
EP 10 EN
9 EXTVDD
567 8
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2016 Microchip Technology Inc.
DS20005620A-page 1
1 page  
MIC2128
ELECTRICAL CHARACTERISTICS (Note 1)
Electrical Specifications: unless otherwise specified, VIN = 12V, VOUT = 1.2V; VBST - VSW = 5V, TA = +25°C.
Boldface values indicate -40°C TJ +125°C (Note 2).
Parameter
Symbol
Min. Typ. Max. Units
Test Conditions
FET Drivers
DH On-Resistance, High
State
RDH(PULL-UP)
—
2
3
DH On-Resistance, Low RDH(PULL_DOWN) — 2 4
State
DL On-Resistance, High
State
RDL(PULL-UP)
—
2
4
DL On-Resistance, Low State RDL(PULL_DOWN)
SW, VIN and BST Leakage
—
0.36 0.6
BST Leakage
VIN Leakage
SW Leakage
— — — 30 µA
— — — 50 µA
— — — 50 µA
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
Thermal Protection
VPG_Rise
VPG_Hys
PG_R_DLY
VOL_PG
85 — 95 %VOUT VFB rising
— 6 — %VOUT VFB falling
— 100 —
µs VFB rising
— 70 200 mV VFB < 90% × VNOM, IPG = 1 mA
Overtemperature Shutdown
Overtemperature Shutdown
Hysteresis
TSHDN
TSHDN_Hys
— 150 — °C Junction temperature rising
— 15 — °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.
2016 Microchip Technology Inc.
DS20005620A-page 5
5 Page 
MIC2128
Note: Unless otherwise indicated, VVIN = 48V, fSW = 300 kHz, RILIM = 1.5 k, L = 10 µH, VEXTVDD = VOUT, TA = +25°C
(refer to the Typical Application circuit).
VEN
2V/div
VOUT
2V/div
FIGURE 2-31:
VPG
5V/div
200 µs/div
EN Turn-Off Delay.
IL
5A/div
VVDD
1V/div
VOUT
2V/div
VSW
5V/div
FIGURE 2-34:
Rising.
20 ms/div
VDD UVLO Threshold-
VEN
2V/div
VOUT
2V/div
VSW
50V/div
FIGURE 2-32:
Output.
4 ms/div
EN Turn-On with Prebiased
VVDD
2V/div
VOUT
2V/div
VSW
5V/div
FIGURE 2-35:
Falling.
100 ms/div
VDD UVLO Threshold-
VEN
1V/div
VOUT
2V/div
VSW
50V/div
FIGURE 2-33:
10 ms/div
Enable Thresholds.
VEN
2V/div
VOUT
500 mV/div
IL
5A/div
FIGURE 2-36:
4 ms/div
Enable into Output Short.
2016 Microchip Technology Inc.
DS20005620A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC2128.PDF ] | |
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