LTC1695 データシートの表示（PDF） - Linear Technology
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LTC1695 Datasheet PDF : 20 Pages
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LTC1695
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
VOUT (AC)
20mV/DIV
VOUT (AC)
20mV/DIV
VOUT
2V/DIV
ILOAD
50mA/DIV
VCC = 5V
100µs/DIV
COUT = 4.7µF TANTALUM
ILOAD
50mA/DIV
1695 • G21
VCC = 5V
100µs/DIV
COUT = 4.7µF TANTALUM
1695 • G22
VCC = 5V
CIN = 10µF
COUT = 4.7µF
ILOAD = 1mA
100ms/DIV
1695 • G23
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 VCC directly 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 (0.1Ω to 1Ω)
tantalum or electrolytic capacitor. LTC recommends a
surface mount tantalum capacitor of ≥4.7µF.
6
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