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June 2010 1 MIC2025/2075

MIC2025/2075 Micrel, Inc.

MIC2025/2075

Single-Channel Power Distribution Switch MM8®

General Description

The MIC2025 and MIC2075 are high-side MOSFET switches

optimized for general-purpose power distribution requiring

circuit protection.

The MIC2025/75 are internally current limited and have

thermal shutdown that protects the device and load. The

MIC2075 offers “smart” thermal shutdown that reduces cur-

rent consumption in fault modes. When a thermal shutdown

fault occurs, the output is latched off until the faulty load is

removed. Removing the load or toggling the enable input will

reset the device output.

Both devices employ soft-start circuitry that minimizes inrush

current in applications where highly capacitive loads are em-

ployed. A fault status output ag is provided that is asserted

during overcurrent and thermal shutdown conditions.

The MIC2025/75 is available in the MM8® 8-lead MSOP

and 8-lead SOP.

Typical Application

EN OUT

FLG IN

ON/OFF

OVERCURRENT

MIC2025/75Logic Controller

GND OUT

2.7V to 5.5V

0.1µF

10k

1µF

VIN

GND

Load

Features

• 140mΩ maximum on-resistance

• 2.7V to 5.5V operating range

• 500mA minimum continuous output current

• Short-circuit protection with thermal shutdown

• Fault status ag with 3ms lter eliminates false asser-

tions

• Undervoltage lockout

• Reverse current ow blocking (no “body diode”)

• Circuit breaker mode (MIC2075) reduces power

consumption

• Logic-compatible input

• Soft-start circuit

• Low quiescent current

• Pin-compatible with MIC2525

• UL File # E179633

Applications

• USB peripherals

• General purpose power switching

• ACPI power distribution

• Notebook PCs

• PDAs

• PC card hot swap

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

MM8 is a registered trademark of Micrel, Inc.

UL Recognized Component

Summary of content (14 pages)

PAGE 1
MIC2025/2075 Micrel, Inc. MIC2025/2075 Single-Channel Power Distribution Switch MM8® General Description Features The MIC2025 and MIC2075 are high-side MOSFET switches optimized for general-purpose power distribution requiring circuit protection. • • • • • The MIC2025/75 are internally current limited and have thermal shutdown that protects the device and load. The MIC2075 offers “smart” thermal shutdown that reduces current consumption in fault modes.
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MIC2025/2075 Micrel, Inc.
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MIC2025/2075 Micrel, Inc. Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VIN)...........................................–0.3V to 6V Fault Flag Voltage (VFLG)............................................... +6V Fault Flag Current (IFLG)............................................. 25mA Output Voltage (VOUT).................................................... +6V Output Current (IOUT)................................ Internally Limited Enable Input (IEN)........................
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MIC2025/2075 Symbol Micrel, Inc. Parameter Condition Error Flag Output Resistance IL = 10mA, VIN = 5V Typ Max Units 8 25 Ω 11 40 Ω VFLAG = 5V 10 µA 140 °C 120 °C IL = 10mA, VIN = 3.3V Error Flag Off Current Overtemperature Threshold Min TJ increasing TJ decreasing Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Devices are ESD sensitive.
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MIC2025/2075 Micrel, Inc. S upply On-C urrent vs . T emperature 180 160 160 100 80 3.3V 60 40 20 0 -40 -20 0 20 40 60 TEMPERATURE (°C) 100 5V 80 60 40 I OUT = 500mA 0 20 40 60 TEMPERATURE (°C) +25°C 50 +85°C V IN = 5V R L =10Ω C L =1µF 0 -40 -20 80 100 On-R es is tanc e vs . Input V oltage 5.0 0 20 40 60 TEMPERATURE (°C) 100 +25°C 50 -40°C +85°C 3.0 +25°C -40°C 2.0 1.
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MIC2025/2075 4 DELAY TIME (ms) 5 V IN = 3.3V 4 V IN = 5V 3 2 1 0 -40 -20 0 20 40 60 TEMPERATURE (°C) MIC2025/2075 80 100 3 F lag Delay vs . Input V oltage 3.0 2.5 +25°C 2 -40°C 1 0 2.5 UV L O T hres hold vs . T emperature V IN R IS ING +85°C UVLO THRESHOLD (V) F lag Delay vs . T emperature DELAY TIME (ms) 5 Micrel, Inc. 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 6 5.0 5.5 2.0 V IN F ALLING 1.5 1.0 0.
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MIC2025/2075 Micrel, Inc.
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MIC2025/2075 MIC2025/2075 Micrel, Inc.
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MIC2025/2075 Micrel, Inc. Block Diagram EN OSC. THERMAL SHUTDOWN 1.2V REFERENCE UVLO CHARGE PUMP GATE CONTROL IN CURRENT LIMIT FLAG RESPONSE DELAY OUT FLG GND Functional Description Power Dissipation The device’s junction temperature depends on several factors such as the load, PCB layout, ambient temperature and package type. Equations that can be used to calculate power dissipation of each channel and junction temperature are found below.
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MIC2025/2075 Micrel, Inc. Fault Flag The FLG signal is an N-channel open-drain MOSFET output. FLG is asserted (active-low) when either an overcurrent or thermal shutdown condition occurs. In the case where an overcurrent condition occurs, FLG will be asserted only after the flag response delay time, tD, has elapsed. This ensures that FLG is asserted only upon valid overcurrent conditions and that erroneous error reporting is eliminated.
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MIC2025/2075 Micrel, Inc. Applications Information Universal Serial Bus (USB) Power Distribution The MIC2025/75 is ideally suited for USB (Universal Serial Bus) power distribution applications. The USB specification defines power distribution for USB host systems such as PCs and USB hubs. Hubs can either be self-powered or bus-powered (that is, powered from the bus). Figure 5 below shows a typical USB Host application that may be suited for mobile PC applications employing USB.
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MIC2025/2075 Micrel, Inc. VC C 5.0V 4.50V to 5.25V Upstream VB U S 100mA max. VB U S 10k 3.3V MIC5203-3.3 IN D+ 1µF D– 3.3V USB Controller VIN OUT 1µF GND GND Ferrite Beads MIC2025/75 ON/OFF EN OVERCURRENT GND VB U S OUT FLG IN GND OUT D+ 0.01µF 120µF GND NC NC D– USB Port 0.1µF Data Data Figure 5 USB Host Application 1.5k 3.3V USB Upstream Connector MIC5203-3.3 (LDO) VB U S IN D+ D– OUT USB Logic Controller VIN GND GND 0.1µF 0.
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MIC2025/2075 Micrel, Inc.
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MIC2025/2075 Micrel, Inc. MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.