Datasheet > LTC1165

LTC1165

更新时间： 2022-12-13 11:16:57

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
8页	233K
描述
Triple 1.8V to 6V High-Side MOSFET Drivers

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LTC1165 数据手册

LTC1163/LTC1165

OPERATIO

Gate Charge Pump

Controlled Gate Rise and Fall Times

Gate drive for the power MOSFET is produced by an

internal charge pump circuit which generates a gate volt-

age substantially higher than the power supply voltage.

The charge pump capacitors are included on chip and

thereforenoexternalcomponentsarerequiredtogenerate

gate drive.

When the input is switched ON and OFF, the gate is

charged by the internal charge pump and discharged in a

controlled manner. The charge and discharge rates have

been set to minimize RFI and EMI emissions.

BLOCK DIAGRA

(One Channel)

LTC1165

LTC1163

HIGH

FREQUENCY

OSCILLATOR

CHARGE

GATE

PUMP

GATE

DISCHARGE

BIAS

GENERATOR

INPUT

LOGIC

14V

LTC1163/65 • BD

U U

APPLICATIO S I FOR ATIO

Logic-Level MOSFET Switches

For example, if a 100µF capacitor is powered through a

switchwithaslewrateof0.1V/µs, thecurrentduringstart-

up is:

The LTC1163/LTC1165 are designed to operate with

logic-level N-channel MOSFET switches. Although there

is some variation among manufacturers, logic-level

MOSFET switches are typically rated with V_GS= 4V with

a maximum continuous V_GSrating of ±10V. R_DS(ON)and

maximum V_DSratings are similar to standard MOSFETs

and there is generally little price differential. Logic-level

MOSFETs are frequently designated by an “L” and are

usually available in surface mount packaging. Some

logic-level MOSFETs are rated with V_GSup to ±15V and

can be used in applications which require operation over

the entire 1.8V to 6V range.

I_START= C(∆V/∆t)

= (100 × 10^–6)(1 × 10⁵)

= 10A

Obviously, this is too much current for the regulator (or

output capacitor) to supply and the output will glitch by as

much as a few volts.

The startup current can be substantially reduced by limit-

ing the slew rate at the gate of an N-channel as shown in

Figure 1. The gate drive output of the LTC1163/LTC1165

is passed through a simple RC network, R1 and C1, which

substantially slows the slew rate of the MOSFET gate to

approximately 1.5 × 10^–4V/µs. Since the MOSFET is

operating as a source follower, the slew rate at the source

is essentially the same as that at the gate, reducing the

startup current to approximately 15mA which is easily

Powering Large Capacitive Loads

Electrical subsystems in portable battery-powered equip-

ment are typically bypassed with large filter capacitors to

reduce supply transients and supply induced glitching. If

not properly powered however, these capacitors may

themselves become the source of supply glitching.

1 2 3 456 7 8

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