Microchip MIC2128 Handleiding

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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, “hiccup” mode

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

FREQ EXTVDD

ILIM

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

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

10 nF

330 µF

0.1 µF

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

BST

PG SS

FREQ

PGND

PVDD

EXTVDD

VIN

VDD

AGND

ILIM

15 14 13

5 6 7 8

MIC2128

3 x 3 VQFN* (Top View)

* Includes Exposed Thermal Pad (EP); see Table 3-1.

VDD

BST

PVDD

FREQ

PVDD VIN

PGND

ILIM

Negative Current

Limit

815

THERMAL

SHUTDOWN

11 T

ESTIMATION

Control

Logic

AGND

EXTVDD

LINEAR

REGULATOR

COMPENSATION

VREF

CURRENT LIMIT

DETECTION

0.9

µA

UVLO

LINEAR

REGULATOR

0.6V

REF

1.3 µA

 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

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