lt3570 Linear Technology Corporation, lt3570 Datasheet - Page 3

• Manufacturer Part Number: lt3570
• Description: 1.5a Buck Converter, 1.5a Boost Converter And Ldo Controller
• Manufacturer: Linear Technology Corporation

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 Ratio, f
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
SYN
)
)
/f
OSC
CONDITIONS
(Note 3)
(Note 3)
V
V
V
V
V
V
V
V
I
V
V
R
R
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
T
T
= 44.2k
= 7.87k
= 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 40V, 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
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
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
1.3
1.3
3.1
50
5
UNITS
μMho
3570fa
3
%/V
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