LTC1695CS5 datasheet(6/20 Pages) LINER

6 / 20 page

LTC1695

PIN FUNCTIONS

VCC (Pin 1): Power Supply Input. VCC supplies current to

the internal control circuitry, serves as the reference for

the 6-bit DAC and acts as the power path for the P-channel

low dropout linear regulator. Bypass VCCdirectly to ground

with a low ESR capacitor

≥10µF.

GND (Pin 2): Ground. Tie GND to the ground plane.

SCL (Pin 3): SMBus Clock Input. Data is shifted into SDA

on the rising edge of the SCL clock signal during data

transfer.

SDA (Pin 4): SMBus Bidirectional Data Input/Digital Out-

put. SDA is an open drain output and requires a pull-up

resistor or current source to VCC. Data is shifted into SDA

and acknowledged by SDA.

VOUT (Pin 5): Linear Regulator Output. Connect directly to

the fan’s +VE terminal. VOUT is set to VZS (code 0) on

power-up. For good transient response and stability, use

a general purpose, low cost, medium ESR (0.1

Ω to 1Ω)

tantalum or electrolytic capacitor. LTC recommends a

surface mount tantalum capacitor of

≥4.7µF.

1695 • G21

VOUT (AC)

20mV/DIV

ILOAD

50mA/DIV

100

µs/DIV

VCC = 5V

COUT = 4.7µF TANTALUM

1695 • G22

VOUT (AC)

20mV/DIV

ILOAD

50mA/DIV

100

µs/DIV

VCC = 5V

COUT = 4.7µF TANTALUM

1695 • G23

VOUT

2V/DIV

100ms/DIV

VCC = 5V

CIN = 10µF

COUT = 4.7µF

ILOAD = 1mA

TYPICAL PERFOR A CE CHARACTERISTICS

Load Transient Response

Dropout (Code 63), 5mA to 55mA

Load Transient Response

Dropout (Code 63), 50mA to 100mA

Boost Start Timer

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