LT3570IUF#PBF Linear Technology, LT3570IUF#PBF Datasheet - Page 3
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LT3570IUF#PBF
Manufacturer Part Number
LT3570IUF#PBF
Description
IC PWM BUCK BST DIV CM 24QFN
Manufacturer
Linear Technology
Datasheet
1.LT3570EFEPBF.pdf
(20 pages)
Specifications of LT3570IUF#PBF
Topology
Step-Down (Buck) (1), Step-Up (Boost) (1), Linear (LDO) (1)
Function
Automotive
Number Of Outputs
3
Frequency - Switching
500kHz ~ 2.1MHz
Voltage/current - Output 1
Adj to 0.8V, 1.5A
Voltage/current - Output 2
Adj to 0.8V, 1.5A
Voltage/current - Output 3
Controller
W/led Driver
No
W/supervisor
No
W/sequencer
No
Voltage - Supply
2.5 V ~ 36 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
*
Package / Case
24-QFN
Frequency-max
2.75MHz
Duty Cycle
95%
Pwm Type
Current Mode
Buck
Yes
Boost
Yes
Flyback
No
Inverting
No
Doubler
No
Divider
Yes
Cuk
No
Isolated
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Operating Voltage (V
Minimum Operating Voltage (V
Shutdown Current (Note 4)
V
V
V
Bias Quiescent Current
V
V
V
Switching Frequency
Maximum Duty Cycle
Synchronous Frequency Threshold
Synchronous Frequency Range
Synchronous Frequency Minimum On/Off
Time
FB1,2,3 Pin Voltage
FB1,2,3 Pin Voltage Line Regulation
FB1,2 Pin Bias Current
FB3 Pin Bias Current
SS1,2 Pin Source Current
V
V
SW1
Error Amplifi er 1 Transconductance
Error Amplifi er 1 Voltage Gain
V
V
SW1 Current Limit
SW1 V
SW1 Leakage Current
temperature range, otherwise specifi cations are at T
IN1
IN2
IN3
SHDN1,2,3
SHDN1,2,3
SHDNX
C1,2
C1,2
C1
C1
Pin Switching Threshold
to SW1 Current Gain
Quiescent Current
Quiescent Current
Quiescent Current
Pin Source Current
Pin Sink Current
CESAT
Pin Current
Pin Threshold
Pin UVLO
IN1
IN2
)
)
CONDITIONS
(Note 3)
(Note 3)
V
V
V
V
V
V
V
V
I
V
V
R
R
R
R
V
V
V
V
V
V
(Note 7)
I
SW1 = 40V, V
VIN2
SW1
SHDN1,2,3
SHDN1
SHDN1
SHDN1,3
SHDN1,3
SHDN1,2
SHDN1,2
BIAS
SHDNX
SHDN1,2,3
VIN1,2,3
FB1,2
FB3
SS1,2
FB1,2
FB1,2
T
T
T
T
= 44.2k
= 7.87k
= 44.2k
= 7.87k
= 800mV (Note 6)
> 100μA
= 1A (Note 7)
= 2.5V
= 800mV, V
= 600mV
= 1V
= 500mV
= 12V, V
= 0V, V
= 12V, V
= 2.5V to 36V, V
= 0V, V
= 12V, V
= 0V, V
= 12V, V
= 0V
= 0V
SHDN1
A
SHDN2,3
SHDN2,3
SHDNY,Z
= 25°C. V
SHDN2
SHDN3
SHDN2
SHDN3
C1,2
= 0V
The
= 1V (Note 6)
= 12V
= 12V, V
= 12V
= 0V, V
= 0V
= 0V
= 0V (Note 5)
C1,2
l
IN1,2,3
denotes the specifi cations which apply over the full operating
= 1V
C1
C2
= 0.4V (Not Switching)
= 0.4V (Not Switching)
= 12V, V
SHDN1,2,3
= 12V unless otherwise noted.
l
l
l
l
1900
MIN
450
650
772
0.3
1.1
0.3
1.5
95
80
50
2100
1.25
0.01
TYP
700
500
788
190
100
750
240
2.1
2.1
3.2
3.5
3.5
2.3
0.1
4.5
5.9
2.4
0.2
65
30
30
30
12
12
0
0
LT3570
2300
2750
MAX
150
950
550
804
200
200
2.5
2.5
1.5
4.5
4.5
4.5
1.5
3.1
1.4
1.4
1.5
1.5
3.1
50
5
UNITS
μMho
3570fb
3
%/V
kHz
kHz
kHz
V/V
A/V
mA
mA
mA
mA
mV
mV
mV
μA
μA
μA
μA
μA
μA
nA
nA
μA
μA
μA
μA
ns
%
%
V
V
V
V
V
A