LT3501
3
3501fd
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3501EFE is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Bias Current Ch 1/Ch 2 V
FB1/2
= 0.8V, V
VC1/2
= 1V
l
–250 75 250 nA
Error Amplifier g
m
Ch 1/Ch 2 V
VC1/2
= 1V, I
VC1/2
= ±5µA
l
150 275 450 µmho
Error Amplifier Gain Ch 1/Ch 2 1000 V/V
Error Amplifier to Switch Gain Ch 1/Ch 2 3.3 A/V
Error Amplifier Source Current Ch 1/Ch 2 V
FB1/2
= 0.6V, V
VC1/2
= 1V 10 15 25 µA
Error Amplifier Sink Current Ch 1/Ch 2 V
FB1/2
= 1V, V
VC1/2
= 1V 15 20 30 µA
Error Amplifier High Clamp Ch 1/Ch 2 V
FB1/2
= 0.7V 1.75 2.0 2.25 V
Error Amplifier Switching Threshold Ch 1/Ch 2 V
OUT1/2
= 5V, R
T
/SYNC = 133k 0.5 0.7 1 V
Soft-Start Source Current Ch 1/Ch 2 V
FB1/2
= 0.6V, V
SS1/2
= 0.4V
l
2 3 4.2 µA
Soft-Start V
OH
Ch 1/Ch 2 V
FB1/2
= 0.9V 1.9 2 2.4 V
Soft-Start Sink Current Ch 1/Ch 2 V
FB1/2
= 0.6V, V
SS1/2
= 1V 200 600 1000 µA
Soft-Start V
OL
Ch 1/Ch 2 V
FB1/2
= 0V 50 80 125 mV
Soft-Start to Feedback Offset Ch 1/Ch 2 V
VC1/2
= 1V, V
SS1/2
= 0.4V
l
–16 0 16 mV
Soft-Start Sink Current Ch 1/Ch 2 POR V
SS1/2
= 0.4V (Note 4), V
VC
= 1V 0.5 1.5 2 mA
Soft-Start POR Threshold Ch 1/Ch 2 V
FB1/2
= 0V (Note 4) 55 80 105 mV
Soft-Start Switching Threshold Ch 1/Ch 2 V
FB1/2
= 0V 30 50 70 mV
Power Good Leakage Ch 1/Ch 2 V
FB1/2
= 0.9V, V
PG1/2
= 25V, V
VIN1/2
= 25V 0 1 µA
Power Good Threshold Ch 1/Ch 2 V
FB1/2
Rising, PG1/2 = 20k to 5V
l
87 90 93 %
Power Good Hysteresis Ch 1/Ch 2 V
FB1/2
Falling, PG1/2 = 20k to 5V 20 30 50 mV
Power Good Sink Current Ch 1/Ch 2 V
FB1/2
= 0.65V, V
PG1/2
= 0.4V 400 800 1200 µA
Power Good Shutdown Sink Current Ch 1/Ch 2 V
VIN1/2
= 2V, V
FB1/2
= 0V, V
PG1/2
= 0.4V 10 50 100 µA
R
T
/SYNC Reference Voltage V
FB1/2
= 0.9V, I
RT/SYNC
= –40µA 0.93 0.975 1 V
Switching Frequency R
T
/SYNC = 133k, V
FB1/2
= 0.6V, V
BST1/2
= V
SW
+ 3V
R
T
/SYNC = 15.4k, V
FB1/2
= 0.6V, V
BST1/2
= V
SW
+ 3V
200
1.2
250
1.5
300
1.8
kHz
MHz
Switching Phase Angle Ch A to Ch B R
T
/SYNC = 133k, V
FB1/2
= 0.6V, V
BST1/2
= V
SW
+ 3V 120 180 210 Deg
Minimum Boost for 100% Duty Cycle Ch 1/Ch 2 V
FB1/2
= 0.7V, I
RT/SYNC
= –35µA (Note 5), V
OUT
= 0V 1.7 2 V
SYNC Frequency Range V
BST1/2
= V
SW
+ 3V 250 1500 kHz
SYNC Switching Phase Angle Ch A to Ch B SYNC Frequency = 250kHz, V
BST1/2
= V
SW
+ 3V 120 180 210 Deg
IND + V
OUT
Current Ch 1/Ch 2 V
VOUT1/2
= 0V, V
FB1/2
= 0.9V
V
VOUT1/2
= 5V
40 70
0
100
1
µA
µA
IND to V
OUT
Maximum Current Ch 1/Ch 2 V
VOUT1/2
= 0.5V (Note 6), V
FB1/2
= 0.7V, V
BST1/2
= 20V
V
VOUT1/2
= 5V (Note 6), R
T
/SYNC = 133k, V
BST1/2
= 20V
3.25
3.5
4
4
5
5
A
A
Switch Leakage Current Ch 1/Ch 2 V
SW1/2
= 0V, V
VIN1/2
= 25V
l
0 50 µA
Switch Saturation Voltage Ch 1/Ch 2 I
SW1/2
= 3A, V
BST1/2
= 20V, V
FB1/2
= 0.7V
l
250 600 mV
Boost Current Ch 1/Ch 2 I
SW1/2
= 3A, V
BST1/2
= 20V, V
FB1/2
= 0.7V 25 60 100 mA
Minimum Boost Voltage Ch 1/Ch 2 I
SW1/2
= 3A, V
BST1/2
= 20V, V
FB1/2
= 0.7V 1.4 2.5 V
characterization and correlation with statistical process controls. The
LT3501IFE is guaranteed and tested over the full –40°C to 125°C operating
junction temperature range.
Note 3: Minimum input voltage is defined as the voltage where internal
bias lines are regulated so that the reference voltage and oscillator remain
constant. Actual minimum input voltage to maintain a regulated output will
depend upon output voltage and load current. See Applications Information.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
VIN1/2
= 15V, V
BST1/2
= open, V
RT/SYNC
= 2V, V
VOUT1/2
= open,
unless otherwise specified.
