LTC3418EUHF 查看數據表（PDF） - Linear Technology
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LTC3418EUHF Datasheet PDF : 20 Pages
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LTC3418
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
Peak Inductor Current
vs Burst Clamp Voltage
12
10
8
6
4
5V
2
3.3V
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
VBCLAMP (V)
3418 G13
Load Regulation
0
–0.05
–0.10
Load Step Transient
VIN = 3.3V
VOUT = 1.8V
f = 1MHz
OUTPUT
VOLTAGE
100mV/DIV
–0.15
–0.20
INDUCTOR
CURRENT
5A/DIV
–0.25
–0.30
0 1234 56 78
LOAD CURRENT (A)
3418 G14
VIN = 3.3V
20μs/DIV
VOUT = 2.5V
LOAD STEP: 800mA TO 8A
3418 G15
Load Step Transient
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
5A/DIV
VIN = 3.3V
40μs/DIV
VOUT = 2.5V
LOAD STEP: 3A TO 8A
Burst Mode Operation
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
1A/DIV
3418 G16
VIN = 3.3V
VOUT = 2.5V
LOAD: 200mA
20μs/DIV
Start-Up Transient
OUTPUT
VOLTAGE
500mV/DIV
3418 G17
INDUCTOR
CURRENT
2A/DIV
VIN = 3.3V
VOUT = 2.5V
LOAD: 8A
1ms/DIV
3418 G18
PIN FUNCTIONS
SW (Pins 1, 2, 11, 12, 20, 21, 30, 31): Switch Node
Connection to Inductor. This pin connects to the drains
of the internal main and synchronous power MOSFET
switches.
PVIN (Pins 3, 4, 9, 10, 22, 23, 28, 29): Power Input
Supply. Decouple these pins to PGND with capacitors on
all four corners of the package.
PGOOD (Pin 5): Power Good Output. Open-drain logic
output that is pulled to ground when the output voltage
is not within ±7.5% of regulation point.
RT (Pin 6): Oscillator Resistor Input. Connecting a resistor
to ground from this pin sets the switching frequency.
RUN/SS (Pin 7): Run Control and Soft-Start Input. Forcing
this pin below 0.5V shuts down the LTC3418. In shutdown
all functions are disabled drawing <1.5μA of supply cur-
rent. A capacitor to ground from this pin sets the ramp
time to full output current.
SGND (Pin 8): Signal Ground. All small-signal components
and compensation components should connect to this
ground, which in turn connects to PGND at one point.
PGND (Pins 13, 14, 15, 17, 18, 19, 32, 33, 34, 36, 37,
38): Power Ground. Connect this pin closely to the (–)
terminal of CIN and COUT.
3418fb
5
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