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ManualsBrandsLinear Technology ManualsIntegrated Circuits (ICs)LDO Voltage Regulator, 0 ... 15V, MSOP-10
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LT3042
13
3042fb
For more information www.linear.com/LT3042
PIN FUNCTIONS
BLOCK DIAGRAM
V
+
–
OUTPUT OVERSHOOT
RECOVERY
ERROR
AMPLIFIER
INTERNAL CURRENT
LIMIT
PROGRAMMABLE
CURRENT LIMIT
QC
QP
OUT
C
OUT
C
IN
V
IN
R
L
V
OUT
1.5V
100µA
2mA
V
+
–
300mV
270Ω
QPWR
+
–
DRIVER
+
–
–
+
V
+
–
300mV
ILIM
R
ILIM
–
+
10
IN
1, 2
THERMAL
SHDN
CURRENT
REFERENCE
FAST START-UP
INPUT
UVLO
SET-TO-OUTS
PROTECTION
CLAMP
INPUT UVLO
CURRENT LIMIT
THERMAL SHDN
DROPOUT
R
SET
R
PG
R
PG2
R
PG1
C
SET
+
–
FAST START-UP
DISABLE LOGIC
5
OUTS
3042 BD
9
SET
7
PG
4
PGFB
6
EN/UV
3
GND
8
V
+
–
300mV
V
+
–
1.24V
PROGRAMMABLE
POWER GOOD
+
–
ENABLE
COMPARATOR
BIAS
OUTS (Pin 9): Output Sense. This pin is the noninvert-
ing input to the error amplifier. For optimal transient
performance and load regulation, Kelvin connect OUTS
directly to the output capacitor and the load. Also, tie the
GND connections of the output capacitor and the SET
pin capacitor directly together
. Moreover, place the input
and output capacitors (and their GND connections) very
close together. A parasitic substrate diode exists between
OUTS and GND pins of the LT3042; do not drive OUTS
more than 0.3V below GND during normal operation or
during a fault condition.
OUT (Pin 10): Output. This pin supplies power to the load.
For stability, use a minimum 4.7µF output capacitor with
an ESR below 50mΩ and an ESL below 2nH. Large load
transients require larger output capacitance to limit peak
voltage transients. Refer to the Applications Information
section for more information on output capacitance. A
parasitic substrate diode exists between OUT and GND pins
of the LT3042; do not drive OUT more than 0.3V below
GND during normal operation or during a fault condition.
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