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LT1573C Datasheet(PDF) 6 Page - Linear Technology

Part # LT1573C
Description  Low Dropout PNP Regulator Driver
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1573C Datasheet(HTML) 6 Page - Linear Technology

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6
LT1573
+
+
+
VSHDNTH
+
I3
ILATCH
+
I2
VIN
VIN
SHDN
GND
COMP
ERROR
AMP
VOUT
IDISCHRG
LATCH
DRIVE
NORMALLY
OFF
NORMALLY
ON
NORMALLY
OFF
NORMALLY
OFF
EXTERNAL
CAPACITOR
C1
C2
C4
C3
Q4
+
ICHRG
VDRSAT
VIODTH
VLATCHTH
CEXT
+
+
+
THERMAL
SHUTDOWN
FB
GND
1573 BD
R1
R2
FOR FIXED
VOLTAGE
VERSION
1.265V
7
6
5
2
6
3
4
4
81
Q5
Q3
Q1
Q2
S3
S4
S2
S1
The basic block diagram of the LT1573 is shown above.
The regulating loop consists of a 1.265V reference, an
error amplifier, a Darlington driver and an external PNP
pass transistor. The 1.265V reference feeds the noninvert-
ing input of the error amplifier. The error amplifier drives
the Darlington connected transistor pair Q1 and Q2. The
collector of Q1 comes out to the DRIVE pin and is used to
drive the base of an external PNP power transistor as
shown in Figure 1. The error amplifier will adjust the drive
current to the external PNP power transistor to maintain
the feedback pin voltage at 1.265V. The LT1573 provides
overcurrent protection by means of a timed latch function.
Base current to the external PNP transistor is limited by
placing a resistor between the base of the transistor and
the DRIVE pin. When the DRIVE pin drops below VDRSAT
(the DRIVE pin saturation voltage) the output of the
comparator C2 switches high; S1, which is normally
closed, opens and the external capacitor connected to the
LATCH pin is allowed to charge. Discharge current IDISCHRG
is equal to approximately 28
µAandchargingcurrentICHRG
is equal to approximately 7
µA. If the fault condition goes
away before CEXT charges to the latch threshold, C2 will
switch back low, S1 will close and Q4 will discharge CEXT.
If the fault condition persists long enough for CEXT to
charge up to the latch threshold (VLATCHTH), comparator
C4 will switch high and S4 will close and latch the output
off. The device will stay latched because latching current
ILATCH is greater than the pull-down current of Q4. Thermal
shutdown circuitry will close S4 and latch the device off
with no timing delay. Comparator C1 is used to override
the latching function during start-up. If the difference
between the output voltage and the input voltage is less
than the input-output differential threshold (VIODTH),
comparator C1 output goes high which closes S2. Current
source I2 then drives base of Q4 which prevents CEXT from
charging. Comparator C3 is used for system shutdown
and latch reset. If SHDN pin voltage is higher than shut-
down threshold VSDTH, the comparator C3 output goes
high, shutting down the regulator and closing switch S3.
Current I3 will drive Q4 to discharge CEXT, resetting the
latch.
BLOCK DIAGRA
FU CTIO AL DESCRIPTIO


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