lt3501efe-trpbf Linear Technology Corporation, lt3501efe-trpbf Datasheet - Page 3

• Manufacturer Part Number: lt3501efe-trpbf
• Description: Monolithic Dual Tracking 3a Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
unless otherwise specifi ed.
PARAMETER
Error Amplifi er Source Current Ch 1/2
Error Amplifi er Sink Current Ch 1/2
Error Amplifi er High Clamp Ch 1/2
Error Amplifi er Switching Threshold Ch 1/2
Soft-Start Source Current Ch 1/2
Soft-Start V
Soft-Start Sink Current Ch 1/2
Soft-Start V
Soft-Start to Feedback Offset Ch 1/2
Soft-Start Sink Current Ch 1/2 POR
Soft-Start POR Threshold Ch 1/2
Soft-Start Switching Threshold Ch 1/2
Power Good Leakage Ch 1/2
Power Good Threshold Ch 1/2
Power Good Hysteresis Ch 1/2
Power Good Sink Current Ch 1/2
Power Good Shutdown Sink Current Ch 1/2
R
Switching Frequency
Switching Phase Angle Ch A to Ch B
Minimum Boost for 100% Duty Cycle Ch 1/2
SYNC Frequency Range
SYNC Switching Phase Angle Ch A to Ch B
IND + V
IND to V
Switch Leakage Current Ch 1/2
Switch Saturation Voltage Ch 1/2
Boost Current Ch 1/2
Minimum Boost Voltage Ch 1/2
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 specifi cations
from 0°C to 125°C junction temperature. Specifi cations 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 defi ned as the voltage where internal
bias lines are regulated so that the reference voltage and oscillator remain
T
/SYNC Reference Voltage
OUT
OUT
OH
OL
Current Ch 1/2
Maximum Current Ch 1/2
Ch 1/2
Ch 1/2
CONDITIONS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
R
R
R
V
V
SYNC Frequency = 250kHz, V
V
V
V
V
V
I
I
I
SW1/2
SW1/2
SW1/2
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
= 0.6V, 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, 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
SS1/2
BST1/2
BST1/2
BST1/2
FB1/2
VIN1/2
+ 3V
RT/SYNC
RT/SYNC
T
VC1/2
SS1/2
SS1/2
PG1/2
/SYNC = 133k
FB1/2
PG1/2
The
= 1V
FB1/2
FB1/2
= 0.4V
= 0V, V
FB1/2
= 25V
= 20V, V
= 20V, V
= 20V, V
= 1V
= 0.4V
= 1V
= 25V, V
= 0.9V
●
= 0.4V
VIN1/2
= –40µA
= –35µA (Note 5), V
= 0.6V, V
= 0.6V, V
denotes the specifi cations which apply over the full operating
VC
= 0.6V, V
T
/SYNC = 133k, V
PG1/2
FB1/2
= 1V
FB1/2
FB1/2
FB1/2
BST1/2
= 15V, V
VIN1/2
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.
= 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
+ 3V
OUT
SW
SW
BST1/2
SW
= open, V
+ 3V
+ 3V
= 0V
+ 3V
= 20V
= 20V
RT/SYNC
●
●
●
●
●
= 2V, V
1.75
0.93
3.25
MIN
200
–16
400
200
120
250
120
0.5
2.5
1.9
0.5
1.2
3.5
10
15
50
30
87
10
40
55
20
25
VOUT1/2
0.975
3.25
TYP
600
800
250
180
180
250
2.0
0.7
1.5
1.5
1.7
1.4
15
20
80
80
50
90
30
50
70
60
2
0
0
0
4
4
0
= open,
LT3501
1000
1200
1500
MAX
2.25
125
105
100
300
210
210
100
600
100
1.0
2.4
1.8
2.5
25
30
16
70
93
50
50
4
2
1
1
2
1
5
5
UNITS
3501fb
3
MHz
Deg
Deg
kHz
kHz
mV
mV
mA
mV
mV
mV
mV
mA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
%
V
V
V
V
V
A
A
V