Datasheet

LT3507
3
3507fb
For more information www.linear.com/LT3507
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
C
Source Current V
C
= 0.6V 20 µA
V
C
Sink Current V
C
= 0.6V 30 µA
V
C
Clamp Voltage 1.7 V
Switching Frequency R
T
= 40.2k
l
0.9 1.1 MHz
Switching Phase SW1 to SW2,3, R
T
= 40.2k 180 Deg
Foldback Frequency V
FB
= 0V, R
T
= 40.2k 120 kHz
Frequency Shift Threshold on FB 0.4 V
RUN Threshold 1 1.5 V
PGOOD Output Voltage Low I
PGOOD
= 200µA 0.2 0.4 V
PGOOD Pin Leakage V
PGOOD
= 2V 10 400 nA
PGOOD Threshold Offset V
FB
Rising 58 80 105 mV
Feedback Pin Voltage
l
788 800 812 mV
Feedback Pin Bias Current
l
–50 –500 nA
Error Amplifier Transconductance 330 µS
Error Amplifier Voltage Gain 500 V/V
V
C
Switching Threshold 0.9 V
Switch Leakage Current 0.01 10 µA
Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V
Converter 1
V
C1
to Switch Current Gain 5 A/V
Switch 1 Current Limit (Note 3) Duty Cycle = 15%
l
3 4.3 6 A
Switch 1 V
CESAT
I
SW1
= 2A 400 600 mV
BOOST1 Operating Current I
SW1
= 2A 40 60 mA
Converter 2
V
C2
to Switch Current Gain 3.6 A/V
Switch 2 Current Limit (Note 3) Duty Cycle = 15%
l
2 2.9 4 A
Switch 2 V
CESAT
I
SW2
= 1.5A 350 500 mV
BOOST2 Operating Current I
SW2
= 1.5A 40 60 mA
Converter 3
V
C3
to Switch Current Gain 3.6 A/V
Switch 3 Current Limit (Note 3) Duty Cycle = 15%
l
2 2.9 4 A
Switch 3 V
CESAT
I
SW3
= 1.5A 350 500 mV
BOOST3 Operating Current I
SW3
= 1.5A 40 60 mA
LDO Regulator
Feedback Pin Voltage
l
788 800 812 mV
Feedback Pin Bias Current –150 –500 nA
Error Amplifier Voltage Gain 1100 V/V
Line Regulation V
IN
from 5V to 36V 0.05 %/V
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