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LT3501 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3501
Description  Monolithic Dual Tracking 3A Step-Down Switching Regulator
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3501 Datasheet(HTML) 3 Page - Linear Technology

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LT3501
3
3501fb
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,
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
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amplifier Source Current Ch 1/2
VFB1/2 = 0.6V, VVC1/2 = 1V
10
15
25
µA
Error Amplifier Sink Current Ch 1/2
VFB1/2 = 1V, VVC1/2 = 1V
15
20
30
µA
Error Amplifier High Clamp Ch 1/2
VFB1/2 = 0.7V
1.75
2.0
2.25
V
Error Amplifier Switching Threshold Ch 1/2
VOUT1/2 = 5V, RT/SYNC = 133k
0.5
0.7
1.0
V
Soft-Start Source Current Ch 1/2
VFB1/2 = 0.6V, VSS1/2 = 0.4V
●
2.5
3.25
4
µA
Soft-Start VOH Ch 1/2
VFB1/2 = 0.9V
1.9
2
2.4
V
Soft-Start Sink Current Ch 1/2
VFB1/2 = 0.6V, VSS1/2 = 1V
200
600
1000
µA
Soft-Start VOL Ch 1/2
VFB1/2 = 0V
50
80
125
mV
Soft-Start to Feedback Offset Ch 1/2
VVC1/2 = 1V, VSS1/2 = 0.4V
●
–16
0
16
mV
Soft-Start Sink Current Ch 1/2 POR
VSS1/2 = 0.4V (Note 4), VVC = 1V
0.5
1.5
2
mA
Soft-Start POR Threshold Ch 1/2
VFB1/2 = 0V (Note 4)
55
80
105
mV
Soft-Start Switching Threshold Ch 1/2
VFB1/2 = 0V
30
50
70
mV
Power Good Leakage Ch 1/2
VFB1/2 = 0.9V, VPG1/2 = 25V, VVIN1/2 = 25V
0
1
µA
Power Good Threshold Ch 1/2
VFB1/2 Rising, PG1/2 = 20k to 5V
●
87
90
93
%
Power Good Hysteresis Ch 1/2
VFB1/2 Falling, PG1/2 = 20k to 5V
20
30
50
mV
Power Good Sink Current Ch 1/2
VFB1/2 = 0.65V, VPG1/2 = 0.4V
400
800
1200
µA
Power Good Shutdown Sink Current Ch 1/2
VVIN1/2 = 2V, VFB1/2 = 0V, VPG1/2 = 0.4V
10
50
100
µA
RT/SYNC Reference Voltage
VFB1/2 = 0.9V, IRT/SYNC = –40µA
0.93
0.975
1
V
Switching Frequency
RT/SYNC = 133k, VFB1/2 = 0.6V, VBST1/2 = VSW + 3V
RT/SYNC = 15.4k, VFB1/2 = 0.6V, VBST1/2 = VSW + 3V
200
1.2
250
1.5
300
1.8
kHz
MHz
Switching Phase Angle Ch A to Ch B
RT/SYNC = 133k, VFB1/2 = 0.6V, VBST1/2 = VSW + 3V
120
180
210
Deg
Minimum Boost for 100% Duty Cycle Ch 1/2
VFB1/2 = 0.7V, IRT/SYNC = –35µA (Note 5), VOUT = 0V
1.7
2
V
SYNC Frequency Range
VBST1/2 = VSW + 3V
250
1500
kHz
SYNC Switching Phase Angle Ch A to Ch B
SYNC Frequency = 250kHz, VBST1/2 = VSW + 3V
120
180
210
Deg
IND + VOUT Current Ch 1/2
VVOUT1/2 = 0V, VFB1/2 = 0.9V
VVOUT1/2 = 5V
40
70
0
100
1
µA
µA
IND to VOUT Maximum Current Ch 1/2
VVOUT1/2 = 0.5V (Note 6), VFB1/2 = 0.7V, VBST1/2 = 20V
VVOUT1/2 = 5V (Note 6), RT/SYNC = 133k, VBST1/2 = 20V
3.25
3.5
4
4
5
5
A
A
Switch Leakage Current Ch 1/2
VSW1/2 = 0V, VVIN1/2 = 25V
●
050
µA
Switch Saturation Voltage Ch 1/2
ISW1/2 = 3A, VBST1/2 = 20V, VFB1/2 = 0.7V
●
250
600
mV
Boost Current Ch 1/2
ISW1/2 = 3A, VBST1/2 = 20V, VFB1/2 = 0.7V
25
60
100
mA
Minimum Boost Voltage Ch 1/2
ISW1/2 = 3A, VBST1/2 = 20V, VFB1/2 = 0.7V
1.4
2.5
V
constant. Actual minimum input voltage to maintain a regulated output
will depend upon output voltage and load current. See Applications
Information.
Note 4: An internal power-on reset (POR) latch is set on the positive
transition of the SHDN pin through its threshold. The output of the latch
activates current sources on each SS pin which typically sink 1.5mA,
discharging the SS capacitor. The latch is reset when both SS pins are
driven below the soft-start POR threshold or the SHDN pin is taken below
its threshold.
Note 5: To enhance dropout operation, the output switch will be turned off
for the minimum off time only when the voltage across the boost capacitor
drops below the minimum boost for 100% duty cycle threshold.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VVIN1/2 = 15V, VBST1/2 = open, VRT/SYNC = 2V, VVOUT1/2 = open,
unless otherwise specified.



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