MIC9409X [MICREL]

High Side Load Switches for Consumer Applications; 高压侧负载开关为消费类应用


型号：	MIC9409X
厂家：	MICREL SEMICONDUCTOR
描述：	High Side Load Switches for Consumer Applications 高压侧负载开关为消费类应用开关高压
文件：	总16页 (文件大小：816K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC94090/1/2/3/4/5

High Side Load Switches for

Consumer Applications

General Description

Features

The MIC94090/1/2/3/4/5 is a family of high-side load switches

designed for operation from 1.7V to 5.5V input voltage. The

load switch pass element is an internal 130mΩ R_DS(ON)P-

channel MOSFET which enables the device to support up to

1.2A continuous current. Additionally, the load switch

supports 1.5V logic level control and shutdown features.

• 1.7V to 5.5V input voltage range

• 1.2A continuous operating current

• 130mΩ R_DS(ON)

• Internal level shift for CMOS/TTL control logic

• Ultra low quiescent current

• Micro-power shutdown current

• Rapid turn-on: MIC94090/1

• Soft-Start: MIC94092/3 (790µs), MIC94094/5 (120µs)

• Load discharge circuit: MIC94091/3/5

The MIC94090 and MIC94091 feature rapid turn on. The

MIC94092 and MIC94093 provide a slew rate controlled soft-

start turn-on of 790µs, while the MIC94094 and MIC94095

provide a slew rate controlled soft-start turn-on of 120µs. The

soft-start feature option prevents an in-rush current event

from pulling down the input supply voltage.

• Space saving and thermally capable 1.2mm x 1.2mm

Thin MLF^®package

The MIC94091, MIC94093, and MIC94095 include a 250Ω

auto discharge load circuit that is switched on when the load

switch is disabled.

• Industry standard SC-70-6 package

Applications

An active pull-down on the enable input keeps the

MIC94090/1/2/3/4/5 in a default OFF state until the enable pin

is pulled above 1.25V. Internal level shift circuitry allows low

voltage logic signals to switch higher supply voltages. The

enable voltage can be as high as 5.5V and is not limited by

the input voltage.

• Cellular phones

• Portable Navigation Devices (PND)

• GPS modules

• Personal Media Players (PMP)

• Ultra Mobile PCs

• Other Portable applications

• PDAs

The MIC94090/1/2/3/4/5 operating voltage range makes

them ideal for Lithium ion and NiMH/NiCad/Alkaline battery

powered systems, as well as non-battery powered

applications. The devices provide low quiescent current and

low shutdown current to maximize battery life.

• Portable instrumentation

• Industrial and DataComm equipment

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

_________________________________________________________________________________________________________

Typical Application

MIC94090 (ultra fast turn on)

MIC94092 (790µs soft-start)

MIC94094 (120µs soft-start)

MIC94091 (ultra fast turn on with auto-discharge)

MIC94093 (790µs soft-start with auto-discharge)

MIC94095 (120µs soft-start with auto-discharge)

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

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

M9999-033109-A

March 2009

Micrel, Inc.

MIC94090/1/2/3/4/5

Ordering Information

Part Number

Pb-Free

Part Marking

Pb-Free⁽¹⁾

Fast

Turn On

Soft-

Start

Load

Discharge

Package^{(2) (3)}

MIC94090YMT

MIC94091YMT

MIC94092YMT

MIC94093YMT

MIC94094YMT

MIC94095YMT

MIC94090YC6

MIC94091YC6

MIC94092YC6

MIC94093YC6

MIC94094YC6

MIC94095YC6

Notes:

●

4-Pin 1.2mm x 1.2mm Thin MLF^®

SC-70-6

●

790µs

120µs

D1D

D2D

D5D

D7D

0DD

1DD

●

SC-70-6

790µs

120µs

SC-70-6

1. Under bar symbol ( _ ) may not be to scale.

2. Thin MLF^®▲ = Pin 1 identifier.

3. Thin MLF^®is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Pin Configuration

PIN 1 TRIANGLE

BY MARKING

VOUT

GND

VIN

4-Pin (1.2mm x 1.2mm) Thin MLF^®(MT)

Top View

6-Pin SC-70-6 (C6)

Top View

Pin Description

Pin Number

Pin Name Pin Function

TMLF-4

SC-70-6

2, 5

V_OUT

GND

V_IN

Drain of P-Channel MOSFET.

Ground: Connect to electrical ground.

Source of P-Channel MOSFET.

Enable (Input): Active-high CMOS-compatible control input for switch. Internal 2MΩ

pull down resistor to GND, output will be off if this pin is left floating.

No Internal Connection. A signal or voltage applied to this pin will have no effect on

device operation.

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Absolute Maximum Ratings⁽¹⁾

Operating Ratings⁽²⁾

Input Voltage (V_IN)...................................................... +6V

Enable Voltage (V_EN) ................................................. +6V

Continuous Drain Current (I_D)⁽³⁾

Input Voltage (V_IN)....................................... +1.7 to +5.5V

Junction Temperature (T_J).....................–40°C to +125°C

Package Thermal Resistance

T_A= 25°C (MLF^®).............................................. ±1.2A

T_A= 25°C (SC-70) ............................................ ±1.2A

Pulsed Drain Current (I_DP)⁽⁴⁾.................................... ±6.0A

Continuous Diode Current (I_S)⁽⁵⁾............................ –50mA

Storage Temperature (T_s) ..................... –55°C to +150°C

ESD Rating – HBM⁽⁶⁾...................................................3kV

Thin MLF^®(θ_JC)⁽³⁾............................................60°C/W

Thin MLF^®(θ_JA)⁽³⁾..........................................140°C/W

SC-70-6 (θ_JC)................................................100°C/W

SC-70-6 (θ_JA)................................................240°C/W

Electrical Characteristics

T_A= 25°C, bold values indicate –40°C< T_A< +85°C, unless noted.

Symbol

V_{EN_TH}

I_Q

Parameter

Condition

Min

0.4

Typ

Max

1.25

Units

Enable Threshold Voltage

V_IN= 1.7V to 4.5V, I_D= –250μA

Quiescent Current Measured on V_IN= V_EN= 5.5V, I_D= OPEN

the V_INPin

0.1

µA

Measured on V_INMIC94090/1

V_IN= V_EN= 5.5V, I_D= OPEN

µA

Measured on V_INMIC94092/3/4/5

I_EN

I_SD

Enable Input Current

Shutdown Current

V_IN= V_EN= 5.5V, I_D= OPEN

2.5

µA

V_IN= +5.5V, V_EN= 0V, I_D= OPEN

0.01

Measured on the V_INpin⁽⁷⁾

I_SHUT-SWITCH

R_DS(ON)

OFF State Leakage Current

_IN= +5.5V, V_EN= 0V, I_D= SHORT

0.01

µA

(7)

Measured on V_OUT

P-Channel Drain to Source ON

Resistance

V_IN= +5.0V, I_D= –100mA, V_EN= 1.5V

V_IN= +4.5V, I_D= –100mA, V_EN= 1.5V

V_IN= +3.6V, I_D= –100mA, V_EN= 1.5V

V_IN= +2.5V, I_D= –100mA, V_EN= 1.5V

V_IN= +1.8V, I_D= –100mA, V_EN= 1.5V

130

135

140

170

235

260

250

225

235

255

315

355

375

400

mΩ

Ω

_IN= +1.7V, I_D= –100mA, V_EN= 1.5V

_IN= +3.6V, I_TEST= 1mA, V_EN= 0V

R_SHUTDOWN

Turn-Off Resistance

MIC94091/3/5

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Electrical Characteristics (Dynamic)

T_A= 25°C, bold values indicate –40°C< T_A< +85°C, unless noted.

Symbol

Parameter

Condition

Min

Typ

Max

Units

t_{ON_DLY}

Turn-On Delay Time

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

MIC94090/1

0.4

1.5

µs

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

MIC94092/3

200

740

110

0.4

1500

165

µs

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

MIC94094/5

t_{ON_RISE}

Turn-On Rise Time

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

MIC94090/1

1.5

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

MIC94092/3

400

790

120

1500

175

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

MIC94094/5

t_{OFF_DLY}

t_{OFF_FALL}

Notes:

Turn-Off Delay Time

Turn-Off Fall Time

V_IN= +3.6V, ID = –100mA, V_EN= 1.5V

200

100

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed to function outside its operating rating.

3. With backside thermal contact to PCB. See thermal considerations section.

4. Pulse width <300μs with < 2% duty cycle.

5. Continuous body diode current conduction (reverse conduction, i.e. V_OUTto V_IN) is not recommended.

6. Devices are ESD sensitive. Handling precautions recommended. HBM (Human body model), 1.5kΩ in series with 100pF.

7. Measured on the MIC94090YMT.

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Typical Characteristics

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Typical Characteristics

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Functional Characteristics

MIC94090

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

MIC94091

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

MIC94092

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

MIC94093

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

MIC94094

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

MIC94095

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Application Information

A switch is intended to drive a 500mA load and is placed

on a printed circuit board which has a ground plane area

of at least 25mm square. The Voltage source is a Li-ion

battery with a lower operating threshold of 3V and the

ambient temperature of the assembly can be up to 50^oC.

Power Dissipation Considerations

As with all power switches, the ultimate current rating of

the switch is limited by the thermal properties of the

package and the PCB it is mounted on. There is a

simple, ohms law type relationship between thermal

resistance, power dissipation and temperature which are

analogous to an electrical circuit:

Summary of variables:

I_SW= 0.5A

VIN = 3V to 4.2V

Tamb = 50^oC

Rθ_JC= 60^oC/W from Datasheet (P. 3)

Rθ_CA= 53^oC/W Read from Graph in Fig. 3

Figure 1. Electrical Circuit

From this simple circuit we can calculate Vx if we know

Isource, Vz and the resistor values, Rxy and Ryz using

the equation:

Vx = Isource⋅

(

Rxy + Ryz + Vz

)

Thermal circuits can be considered using these same

rules and can be drawn similarly replacing current

sources with Power dissipation (in Watts), Resistance

with Thermal Resistance (in C/W) and Voltage sources

with temperature (in ^oC).

Figure 3. Excerpt from the LDO Book ⁽¹⁾

_DISS= I_SW²x R_SWmax

The worst case switch resistance (R_SWmax) at the lowest

VIN of 3V is not available in the datasheet, so the next

lower value of VIN is used.

Figure 2. Thermal Equivalent Circuit

R_SWmax@ 2.5v = 315mΩ

Now replacing the variables in the equation for Vx, we

can find the junction temperature (Tj) from power

dissipation, ambient temperature and the known thermal

resistance of the PCB (Rθ_CA) and the package (Rθ_JA).

If this were a figure for worst case R_SWmaxfor 25^oC, an

additional consideration is to allow for the maximum

junction temperature of 125^oC, the actual worst case

resistance in this case will be 30% higher (See R_DS(on)

variance vs. temperature graph).

T_J= P_DISS

⋅

(

Rθ_JC+ Rθ_CA

)

+ T_AMB

(1)

It is this equation that is used to determine the graphs on

page 7. P_DISSis calculated as (I_SWITCH²x R_SWmax). Rθ_JCis

found in the operating ratings section of the datasheet

and Rθ_CA(the PCB thermal resistance) values for

various PCB copper areas can be taken from ‘Designing

with Low Dropout Voltage Regulators’⁽¹⁾available from

the Micrel website (LDO Application Hints).

R_SWmax@ 2.5v (@ 125’C) = 315 x 1.3 = 410mΩ

Therefore junction temperature (T_J):

T_J= 0.5²x 0.41 x (60+53) + 50

T_J= 62^oC

from (Eqn. 1)

This is well below the maximum 125^oC.

Example:

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Package Information

6-Pin SC-70 (C6)

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

4-Pin Thin MLF^®(MT)

March 2009

M9999-033109-A

Micrel, Inc.

MIC94090/1/2/3/4/5

Landing Pattern

Optional for maximum thermal performance. Heatsink should be connected to GND plane of PCB for maximum thermal performance.

Suggested Land Pattern 4-Pin Thin MLF^®(MT)

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

The 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.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product

can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant

into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A

Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully

indemnify Micrel for any damages resulting from such use or sale.

March 2009

M9999-033109-A

MIC9409X [MICREL]

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