LT3570EFE#PBF Linear Technology, LT3570EFE#PBF Datasheet - Page 4

• Manufacturer Part Number: LT3570EFE#PBF
• Description: IC PWM BUCK BST DIV CM 20TSSOP
• Manufacturer: Linear Technology

Specifications of LT3570EFE#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: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• 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
• Primary Input Voltage: 36V
• No. Of Outputs: 3
• Output Current: 2.4A
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Supply Voltage Range: 2.1V To 36V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LT3570
ELECTRICAL CHARACTERISTICS
TYPICAL PERFORMANCE CHARACTERISTICS
PARAMETER
SW2
Error Amplifi er 2 Transconductance
Error Amplifi er 2 Voltage Gain
V
V
SW2 Current Limit
SW2 V
SW2 Leakage Current
BOOST Pin Current
LDO
LDO Maximum Output Current
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 LT3570E 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
LT3570I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: V
boost converter. V
4
temperature range, otherwise specifi cations are at T
C2
C2
0.800
0.795
0.790
0.785
0.775
0.770
0.780
Pin Switching Threshold
to SW2 Current Gain
CESAT
–50
Feedback Voltage vs Temperature
IN2
supplies power for the part. V
–25
IN3
0
TEMPERATURE (°C)
supplies power only to the LDO Controller.
25
50
75
100
125
IN1
3570 G01
supplies power only to the
CONDITIONS
(Note 7)
I
SW2 = 0V, V
I
I
V
SW2
SW2
SW2
150
FB3
= 600mV
= 1A (Note 7)
= 0.5A
= 1.5A
2500
2000
1500
1000
500
IN2
0
A
–50
Frequency vs Temperature
= 40V, V
= 25°C. V
–25
The
SHDN2
0
l
IN1,2,3
TEMPERATURE (°C)
denotes the specifi cations which apply over the full operating
25
= 0V
R
R
R
T
T
T
= 44.2k
Note 4: Shutdown current is for each individual input current.
Note 5: Current fl ows into the pin.
Note 6: Current fl ows out of the pin.
Note 7: Switch current limit and switch V
and/or correlation to static test.
Note 8: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
range when overtemperature protection is active. Continuous operation
above the specifi ed maximum operating junction temperature may impair
device reliability.
= 20k
50
= 12V, V
= 7.87k
75
SHDN1,2,3
100 125
3570 G02
150
= 12V unless otherwise noted.
5.0
4.8
4.4
3.6
4.6
4.2
4.0
3.8
–50
Soft-Start Current vs Temperature
MIN
1.5
10
–25
CESAT
0
TEMPERATURE (°C)
guaranteed by design
TYP
195
100
700
240
5.4
2.4
0.2
25
15
30
50
MAX
75
3.1
20
5
100 125
UNITS
3570 G03
μMho
3570fb
V/V
A/V
mV
mV
mA
mA
mA
150
μA
A