LT3505 LINER [Linear Technology], LT3505 Datasheet - Page 3

• Manufacturer Part Number: LT3505
• Description: Monolithic Dual Tracking 3A Step-Down Switching
• Manufacturer: LINER [Linear Technology]

elecTrical characTerisTics
temperature range, otherwise specifications are at T
unless otherwise specified.
PARAMETER
Feedback Bias Current Ch 1/Ch 2
Error Amplifier g
Error Amplifier Gain Ch 1/Ch 2
Error Amplifier to Switch Gain Ch 1/Ch 2
Error Amplifier Source Current Ch 1/Ch 2
Error Amplifier Sink Current Ch 1/Ch 2
Error Amplifier High Clamp Ch 1/Ch 2
Error Amplifier Switching Threshold Ch 1/Ch 2
Soft-Start Source Current Ch 1/Ch 2
Soft-Start V
Soft-Start Sink Current Ch 1/Ch 2
Soft-Start V
Soft-Start to Feedback Offset Ch 1/Ch 2
Soft-Start Sink Current Ch 1/Ch 2 POR
Soft-Start POR Threshold Ch 1/Ch 2
Soft-Start Switching Threshold Ch 1/Ch 2
Power Good Leakage Ch 1/Ch 2
Power Good Threshold Ch 1/Ch 2
Power Good Hysteresis Ch 1/Ch 2
Power Good Sink Current Ch 1/Ch 2
Power Good Shutdown Sink Current Ch 1/Ch 2
R
Switching Frequency
Switching Phase Angle Ch A to Ch B
Minimum Boost for 100% Duty Cycle Ch 1/Ch 2 V
SYNC Frequency Range
SYNC Switching Phase Angle Ch A to Ch B
IND + V
IND to V
Switch Leakage Current Ch 1/Ch 2
Switch Saturation Voltage Ch 1/Ch 2
Boost Current Ch 1/Ch 2
Minimum Boost Voltage Ch 1/Ch 2
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,
T
/SYNC Reference Voltage
OUT
OUT
OH
OL
Current Ch 1/Ch 2
Maximum Current Ch 1/Ch 2
Ch 1/Ch 2
Ch 1/Ch 2
m
Ch 1/Ch 2
CONDITIONS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
R
R
R
V
SYNC Frequency = 250kHz, V
V
V
V
V
V
I
I
I
SW1/2
SW1/2
SW1/2
FB1/2
VC1/2
FB1/2
FB1/2
FB1/2
OUT1/2
FB1/2
FB1/2
FB1/2
FB1/2
VC1/2
SS1/2
FB1/2
FB1/2
FB1/2
FB1/2
FB1/2
FB1/2
VIN1/2
FB1/2
T
T
T
FB1/2
BST1/2
VOUT1/2
VOUT1/2
VOUT1/2
VOUT1/2
SW1/2
/SYNC = 133k, V
/SYNC = 15.4k, V
/SYNC = 133k, V
= 0.8V, V
= 0.6V, V
= 1V, V
= 0.7V
= 0.6V, V
= 0.9V
= 0.6V, V
= 0V
= 0V (Note 4)
= 0V
= 0.9V, V
Rising, PG1/2 = 20k to 5V
Falling, PG1/2 = 20k to 5V
= 0.65V, V
= 0.9V, I
= 0.7V, I
= 1V, I
= 1V, V
= 0.4V (Note 4), V
= 3A, V
= 3A, V
= 3A, V
= 0V, V
= 2V, V
= V
= 5V, R
= 0V, V
= 5V
= 0.5V (Note 6), V
= 5V (Note 6), R
J
SW
= 25°C. V
VC1/2
VC1/2
SS1/2
BST1/2
BST1/2
BST1/2
FB1/2
VIN1/2
RT/SYNC
RT/SYNC
+ 3V
T
VC1/2
VC1/2
SS1/2
SS1/2
PG1/2
/SYNC = 133k
FB1/2
PG1/2
The
= ±5µA
= 1V
= 0.4V
FB1/2
FB1/2
= 0V, V
FB1/2
= 25V
= 20V, V
= 20V, V
= 20V, V
= 1V
= 1V
= 0.4V
= 1V
= 25V, V
= 0.9V
= 0.4V
l
= –40µA
= –35µA (Note 5), V
VIN1/2
= 0.6V, V
= 0.6V, V
denotes the specifications which apply over the full operating
VC
= 0.6V, V
T
PG1/2
/SYNC = 133k, V
FB1/2
= 1V
FB1/2
FB1/2
FB1/2
VIN1/2
BST1/2
= 15V, 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.
= 0.4V
= 0.7V, V
BST1/2
BST1/2
BST1/2
= 0.7V
= 0.7V
= 0.7V
= 25V
= V
BST1/2
SW
= V
= V
= V
BST1/2
OUT
+ 3V
SW
SW
BST1/2
SW
= open, V
+ 3V
+ 3V
= 0V
+ 3V
= 20V
= 20V
RT/SYNC
l
l
l
l
l
l
l
= 2V, V
–250
1.75
0.93
3.25
MIN
150
200
–16
400
200
120
250
120
0.5
1.9
0.5
1.2
3.5
10
15
50
55
30
87
20
10
40
25
2
VOUT1/2
0.975
1000
TYP
275
600
800
250
180
180
250
3.3
2.0
0.7
1.5
1.5
1.7
1.4
75
15
20
80
80
50
90
30
50
70
60
3
2
0
0
0
4
4
0
= open,
LT3501
1000
1200
1500
MAX
2.25
250
450
125
105
100
300
210
210
100
600
100
4.2
2.4
1.8
2.5
25
30
16
70
93
50
50
1
2
1
1
2
1
5
5
UNITS
3501fd
µmho
3
MHz
Deg
Deg
kHz
kHz
V/V
A/V
mV
mV
mA
mV
mV
mV
mV
mA
nA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
%
V
V
V
V
V
A
A
V