, RT Voltage ...................................................6V
PG, BD Voltage .........................................................30V
Operating Junction Temperature Range (Note 2)
E-, I-grade .......................................... –40°C to 125°C
H-grade.............................................. –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS Only ............................................................ 300°C
PIN CONFIGURATION
TOP VIEW
*FB/V
OUT
1
EN 2
V
IN
3
GND 4
GND 5
11
GND
10 RT
9 PG
8 BD
7 BOOST
6 SW
*FB/V
OUT
EN
V
IN
GND
GND
1
2
3
4
5
TOP VIEW
10
9
8
7
6
RT
PG
BD
BOOST
SW
DDB PACKAGE
10-LEAD (3mm
×
2mm) PLASTIC DFN
θ
JA
= 76°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MS PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 100°C/W
*FB for LT3970, V
OUT
for LT3970-3.3, LT3970-3.42, LT3970-5.
2
Rev. D
For more information
www.analog.com
LT3970 Series
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3970EDDB#PBF
LT3970EDDB#TRPBF
LFCZ
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970IDDB#PBF
LT3970IDDB#TRPBF
LFCZ
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970EMS#TRPBF
LTFDB
10-Lead Plastic MSOP
–40°C to 125°C
LT3970EMS#PBF
LT3970IMS#PBF
LT3970IMS#TRPBF
LTFDB
10-Lead Plastic MSOP
–40°C to 125°C
LT3970HMS#PBF
LT3970HMS#TRPBF
LTFDB
10-Lead Plastic MSOP
–40°C to 150°C
LT3970EDDB-3.3#PBF
LT3970EDDB-3.3#TRPBF
LFQH
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970IDDB-3.3#PBF
LT3970IDDB-3.3#TRPBF
LFQH
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970EMS-3.3#PBF
LT3970EMS-3.3#TRPBF
LTFQG
10-Lead Plastic MSOP
–40°C to 125°C
LT3970IMS-3.3#PBF
LT3970IMS-3.3#TRPBF
LTFQG
10-Lead Plastic MSOP
–40°C to 125°C
LT3970HMS-3.3#PBF
LT3970HMS-3.3#TRPBF
LTFQG
10-Lead Plastic MSOP
–40°C to 150°C
LT3970EDDB-3.42#PBF
LT3970EDDB-3.42#TRPBF LGGG
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970EDDB-5#PBF
LT3970EDDB-5#TRPBF
LFQF
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970IDDB-5#TRPBF
LFQF
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3970IDDB-5#PBF
LT3970EMS-5#PBF
LT3970EMS-5#TRPBF
LTFQD
10-Lead Plastic MSOP
–40°C to 125°C
LT3970IMS-5#PBF
LT3970IMS-5#TRPBF
LTFQD
10-Lead Plastic MSOP
–40°C to 125°C
LT3970HMS-5#PBF
LT3970HMS-5#TRPBF
LTFQD
10-Lead Plastic MSOP
–40°C to 150°C
AUTOMOTIVE**
LT3970EMS#WTRPBF
LTFDB
10-Lead Plastic MSOP
–40°C to 125°C
LT3970EMS#WPBF
LT3970IMS#WPBF
LT3970IMS#WTRPBF
LTFDB
10-Lead Plastic MSOP
–40°C to 125°C
LT3970HMS#WPBF
LT3970HMS#WTRPBF
LTFDB
10-Lead Plastic MSOP
–40°C to 150°C
LT3970EMS-3.3#WPBF
LT3970EMS-3.3#WTRPBF LTFQG
10-Lead Plastic MSOP
–40°C to 125°C
LT3970IMS-3.3#WPBF
LT3970IMS-3.3#WTRPBF
LTFQG
10-Lead Plastic MSOP
–40°C to 125°C
LT3970HMS-3.3#WPBF
LT3970HMS-3.3#WTRPBF LTFQG
10-Lead Plastic MSOP
–40°C to 150°C
LT3970EMS-5#WPBF
LT3970EMS-5#WTRPBF
LTFQD
10-Lead Plastic MSOP
–40°C to 125°C
–40°C to 125°C
LT3970IMS-5#WPBF
LT3970IMS-5#WTRPBF
LTFQD
10-Lead Plastic MSOP
LT3970HMS-5#WPBF
LT3970HMS-5#WTRPBF
LTFQD
10-Lead Plastic MSOP
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions
of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
Rev. D
For more information
www.analog.com
3
LT3970 Series
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Quiescent Current from V
IN
V
EN
Low
V
EN
High
V
EN
High, –40°C to 125°C
V
EN
High, –40°C to 150°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
V
FB
= 1.21V
4.2V < V
IN
< 40V
R
T
= 41.2k, V
IN
= 6V
R
T
= 158k, V
IN
= 6V
R
T
= 768k, V
IN
= 6V
V
IN
= 5V, V
FB
= 0V
V
IN
= 5V
I
SW
= 200mA
I
SCH
= 100mA, V
IN
= V
BD
= NC
V
SW
= 12V
I
SCH
= 50mA, V
IN
= NC, V
BOOST
= 0V
V
REVERSE
= 12V
V
IN
= 5V
I
SW
= 200mA, V
BOOST
= 15V
V
EN
= 12V
EN Rising, V
IN
≥ 4.2V
EN Rising, V
IN
≥ 4.2V
V
FB
Rising
V
FB
Rising
V
PG
= 3V
V
PG
= 0.4V
V
IN
= 10V
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
BD
= 3.3V unless otherwise noted. (Note 2)
CONDITIONS
l
MIN
TYP
4
0.7
1.7
MAX
4.2
1.2
2.7
3.5
4
1.225
1.235
1.235
3.34
3.366
3.366
3.461
3.488
5.06
5.1
5.1
20
0.01
2.64
960
240
865
500
2
2
2
1.8
10
30
1.06
1.07
160
13.5
1
UNITS
V
µA
µA
µA
µA
V
V
V
V
V
V
V
V
V
V
V
nA
%/V
MHz
kHz
kHz
mA
mA
mV
µA
mV
µA
mV
µA
V
mA
nA
V
V
mV
mV
mV
%
%
µA
µA
ns
l
l
l
l
l
l
l
l
l
l
LT3970 Feedback Voltage
1.195
1.185
1.18
3.26
3.234
3.217
3.379
3.352
4.94
4.9
4.875
1.21
1.21
1.21
3.3
3.3
3.3
3.42
3.42
5
5
5
0.1
0.0002
LT3970-3.3 Output Voltage
LT3970-3.42 Output Voltage
LT3970-5 Output Voltage
LT3970 FB Pin Bias Current (Note 3)
FB/Output Voltage Line Regulation
Switching Frequency
1.76
640
160
535
350
2.25
800
200
700
400
175
0.05
650
0.05
875
0.02
1.4
7
1
Switch Current Limit
Catch Schottky Current Limit
Switch V
CESAT
Switch Leakage Current
Catch Schottky Forward Voltage
Catch Schottky Reverse Leakage
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
EN Pin Current
LT3970 EN Voltage Threshold
LT3970-X EN Voltage Threshold
EN Voltage Hysteresis
LT3970 PG Threshold Offset from Feedback Voltage
LT3970 PG Hysteresis
LT3970-X PG Threshold Offset from Output Voltage
LT3970-X PG Hysteresis as % of Output Voltage
PG Leakage
PG Sink Current
Minimum Switch On-Time
Minimum Switch Off-Time
0.94
0.93
80
6.5
1
1
30
120
12
10
1.0
0.01
30
80
90
100
160
l
ns
4
Rev. D
For more information
www.analog.com
LT3970 Series
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 LT3970E 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
LT3970I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3970H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3:
Bias current flows into the FB pin.
Note 4:
This is the minimum voltage across the boost capacitor needed to
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