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LTC3521 датащи(PDF) 8 Page - Linear Technology

номер детали LTC3521
подробное описание детали  Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters
PDF  20 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC3521 датащи(HTML) 8 Page - Linear Technology

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LTC3521

3521f
block DiaGraM
+
–
+
–
PGOOD1
PVOUT
3
16
FB1
SHDN1
FILTER
REVERSE ILIMIT
FORWARD
ILIMIT
21
0.55V
2.1A
0.375A
+
–
+
–
0A
IZERO
BUCK-BOOST
PWM
LOGIC
GATE
DRIVES
GATE
DRIVES
BUCK
PWM
LOGIC
BANDGAP
REFERENCE
AND OT
SHUTDOWN
OSCILLATOR
UVLO
0.6V
SOFT-START
RAMP
SOFT-START
RAMP
9
SHDN2
8
SHDN3
7
10
D
PVOUT
14
SW1B
15
SW1A
11
PVIN1
22
PVIN2
C
B
A
PGND1B
PGND1A
PGND2
ZERO CROSSING
4
VIN
6
PWM
INTERNAL
VCC
19
SW2
FB2
+
–
0A
+
–
+
–
1.05A
ILIMIT
0.55V
3521 BD
0.60V
gm
PGND1A
5
GND
12
PGND1B
18
PGND2
SLOPE
COMPENSATION
24
PGOOD2
+
1V
0.6V
0.9V
0.55V
2
PVIN2
GATE
DRIVES
BUCK
PWM
LOGIC
SOFT-START
RAMP
PGND2
ZERO CROSSING
17
SW3
FB3
+
–
0A
+
–
+
–
1.05A
ILIMIT
0.55V
0.60V
gm
SLOPE
COMPENSATION
23
PGOOD3
+
1
PVIN2
(UF Package)
NC (Pin 19, UF Package Only): No Internal Connection.
PVIN2(Pin20/Pin22):HighCurrentPowerSupplyConnec-
tion Used to Supply the Buck Converter Power Switches.
This pin should be bypassed by a 10µF or larger ceramic
cap. The bypass capacitor should be placed as close to
the pin as possible and should have a short return path
to ground. Pins VIN, PVIN1, and PVIN2 must be connected
together in the application circuit.
Exposed Pad (Pin 21/Pin 25): The Exposed Pad must
be electrically connected to ground. Pins GND, PGND1A,
PGND1B,PGND2andtheExposedPadmustbeconnected
together in the application circuit.
PGND1A(Pin21,UFPackageOnly):HighCurrentGround
Connection for the Buck-Boost Switch B. The PCB trace
connecting this pin to ground should be made as short
and wide as possible.
pin FuncTions



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