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LT1432-3.3 Datasheet(PDF) 1 Page - Linear Technology

Part # LT1432-3.3
Description  3.3V High Efficiency Step-Down Switching Regulator Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1432-3.3 Datasheet(HTML) 1 Page - Linear Technology

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1
LT1432-3.3
3.3V High Efficiency Step-Down
Switching Regulator Controller
APPLICATI
TYPICAL
Figure 1. High Efficiency 5V Buck Converter
S
FEATURE
The LT®1432-3.3 is a control chip designed to operate
with the LT1171/LT1271 family of switching regulators to
makeaveryhighefficiency3.3Vstep-down(buck)switch-
ing regulator. A minimum of external components is
needed.
Included is an accurate current limit which uses only
60mV sense voltage and uses “free” PC board trace
material for the sense resistor. Logic controlled electronic
shutdown mode draws only 15
µA battery current. The
switching regulator operates down to 4.5V input.
The LT1432-3.3 has a logic controlled Burst Mode operation
to achieve high efficiency at very light load currents (0mA to
100mA) such as memory keep-alive. In normal switching
mode, the standby power loss is about 30mW, limiting
efficiency at light loads. In Burst Mode operation, standby
loss is reduced to approximately 11mW. Output current in
this mode is typically in the 5mA to 100mA range.
The LT1432-3.3 is available in 8-pin SO and PDIP pack-
ages. The LT1171/LT1271 is also available in surface
mount DD packages.
DESCRIPTIO
I
Accurate Preset 3.3V Output
I
Up to 87% Efficiency
I
Optional Burst ModeTM Operation for Light Loads
I
Can Be Used with Many LTC Switching ICs
I
Accurate Ultra-Low-Loss Current Limit
I
Operates with Inputs from 4.5V to 30V
I
Shutdown Mode Draws Only 15
µA
I
Uses Small 30
µH Inductor
S
APPLICATI
I
Laptop and Palmtop Computers
I
Portable Data-Gathering Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
+
VSW
FB
GND
VIN
VC
LT1271
+
C1
330
µF
35V
C6
0.02
µF
C5
0.03
µF
D1
MBR330p
C3
10
µF
TANT
D2**
L1
30
µH
R2*
0.013
C2
390
µF
16V
VOUT***
3.3V
3A
+
×
MODE LOGIC
220pF
<0.3V = NORMAL MODE
>2.5V = SHUTDOWN
OPEN = Burst Mode
OPERATION
*R2 IS MADE FROM PC BOARD
COPPER TRACES.
**OPTIONAL CONNECTION FOR D2.
EFFICIENCY IS HIGHER, BUT MINIMUM
V
IN INCREASES. SEE APPLICATION
INFORMATION SECTION.
***MAXIMUM CURRENT IS DETERMINED
BY THE CHOICE OF LT1071 FAMILY MAIN SWITCHER IC.
SEE APPLICATION INFORMATION SECTION.
VIN
LT1432-3.3 TA01
OPTIONAL
OUTPUT
FILTER
100
µF
16V
10
µH
3A
+
VC
GND
MODE
DIODE
VOUT
VLIM
V+
LT1432-3.3
VIN
D2
1N5818
FOR CIRCUITS WHICH DO NOT USE
Burst Mode OPERATION, C5 MAY
BE PARALLEL WITH A 680
Ω, 0.1µF
IN SERIES TO GIVE WIDE PHASE MARGIN
WITH DIFFERENT SWITCHING ICs AND
OUTPUT CAPACITORS
0
60
70
80
90
100
1A
2A
3A
20mA
LT1432-3.3 TA02
40mA
60mA
0
Burst Mode OPERATION
(USE mA SCALE)
LT1271, L = 30
µH
VIN = 7V
D2 CONNECTED
TO INPUT
D2 CONNECTED
TO OUTPUT
Efficiency
FOR INFORMATION PURPOSES ONLY
OBSOLETE:
Contact Linear Technology for Potential Replacement


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