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LTC3521 数据表(PDF) 6 Page - Linear Technology

部件名 LTC3521
功能描述  Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters
PDF  20 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3521 数据表(HTML) 6 Page - Linear Technology

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LTC3521

3521f
pin FuncTions
FB3 (Pin 1/Pin 23): Feedback Voltage for the Buck Con-
verter Derived from a Resistor Divider Connected to the
Buck VOUT3 Output Voltage. The buck output voltage is
given by the following equation, where R1 is a resistor
between FB3 and ground, and R2 is a resistor between
FB3 and the buck output voltage:
V
V
R
R
OUT3
0 6 1
2
1
=
+


.
FB2 (Pin 2/Pin 24): Feedback Voltage for the Buck Con-
verter Derived from a Resistor Divider Connected to the
Buck VOUT2 Output Voltage. The buck output voltage is
given by the following equation, where R1 is a resistor
between FB2 and ground, and R2 is a resistor between
FB2 and the buck output voltage:
V
V
R
R
OUT2
0 6 1
2
1
=
+


.
SHDN2 (Pin 3/Pin 1): Forcing this pin above 1.4V enables
the buck converter output at SW2. Forcing this pin below
0.4V disables the buck converter. This pin cannot be left
floating.
PGOOD3 (Pin 4/Pin 2): This pin is an open-drain output
which pulls low under any of the following conditions:
VOUT3 buck output voltage is out of regulation, the part is
(FE/UF Packages)
Typical perForMance characTerisTics
Buck-Boost Current Limit
vs Temperature
Buck Current Limit
vs Temperature
TA = 25°C, unless otherwise noted.
Buck-Boost Peak Current Limit
vs Temperature
TEMPERATURE (°C)
2100
2050
2000
1950
2150
3521 G19
–50 –25
25
0
50
75
100 125
TEMPERATURE (°C)
3300
3250
3200
3350
3521 G20
–50 –25
25
0
50
75
100 125
TEMPERATURE (°C)
1100
1050
1000
950
900
1150
3521 G21
–50 –25
25
0
50
75
100 125
50µs/DIV
VOUT
20mV/DIV
INDUCTOR
CURRENT
200mA/DIV
3521 G16
VIN = 3.6V
VOUT = 3.3V
L = 4.7µH
COUT = 22µF
Buck-Boost Burst to
PWM Transition
Buck Load Step, PWM Mode,
10mA to 400mA
Buck Load Step, Burst Mode
Operation, 10mA to 400mA
100µs/DIV
VOUT
100mV/DIV
INDUCTOR
CURRENT
200mA/DIV
3521 G17
VIN = 3.6V
VOUT = 1.8V
L = 4.7µH
COUT = 10µF
100µs/DIV
VOUT
100mV/DIV
INDUCTOR
CURRENT
200mA/DIV
3521 G18
VIN = 3.6V
VOUT = 1.8V
L = 4.7µH
COUT = 10µF



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