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LT1376CS Datasheet(PDF) 8 Page - Linear Technology

No. de pieza LT1376CS
Descripción Electrónicos  1.5A, 500kHz Step-Down Switching Regulators
PDF  28 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LT1376CS Datasheet(HTML) 8 Page - Linear Technology

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8
LT1375/LT1376
High switch efficiency is attained by using the BOOST pin
to provide a voltage to the switch driver which is higher
than the input voltage, allowing switch to be saturated.
This boosted voltage is generated with an external capaci-
BLOCK DIAGRAM
tor and diode. Two comparators are connected to the
shutdown pin. One has a 2.38V threshold for undervoltage
lockout and the second has a 0.4V threshold for complete
shutdown.
–
+
–
+
–
+
Σ
INPUT
2.9V BIAS
REGULATOR
500kHz
OSCILLATOR
FREQUENCY
SHIFT CIRCUIT
VSW
FB
VC
GND
1375/76 BD
SLOPE COMP
0.1
Ω
BIAS
INTERNAL
VCC
CURRENT
SENSE
AMPLIFIER
VOLTAGE GAIN = 10
SYNC
SHUTDOWN
COMPARATOR
CURRENT
COMPARATOR
ERROR
AMPLIFIER
gm = 2000µMho
FOLDBACK
CURRENT
LIMIT
CLAMP
BOOST
RS
FLIP-FLOP
DRIVER
CIRCUITRY
S
R
0.9V
LOCKOUT
COMPARATOR
0.4V
3.5
µA
Q2
Q1
POWER
SWITCH
2.38V
2.42V
–
+
SHDN
Figure 1. Block Diagram
APPLICATIONS INFORMATION
FEEDBACK PIN FUNCTIONS
The feedback (FB) pin on the LT1376 is used to set output
voltage and also to provide several overload protection
features. The first part of this section deals with selecting
resistors to set output voltage and the remaining part talks
about foldback frequency and current limiting created by
the FB pin. Please read both parts before committing to a
final design. The fixed 5V LT1376-5 has internal divider
resistors and the FB pin is renamed SENSE, connected
directly to the output.
The suggested value for the output divider resistor (see
Figure 2) from FB to ground (R2) is 5k or less, and a
formula for R1 is shown below. The output voltage error
caused by ignoring the input bias current on the FB pin is
less than 0.25% with R2 = 5k. A table of standard 1%
values is shown in Table 1 for common output voltages.



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