, RT Voltage ....................................................6V
PG, BD Voltage .........................................................30V
Operating Junction Temperature Range (Note 2)
LT3990E/LT3990E-X ........................... –40°C to 125°C
LT3990I/LT3990I-X ............................ –40°C to 125°C
LT3990H/LT3990H-X .......................... –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
EN/UVLO
V
IN
GND
GND
1
2
3
4
5
11
GND
10 RT
9 PG
8 BD
7 BOOST
6 SW
FB/V
OUT
*
FB/V
OUT
*
NC
EN/UVLO
NC
V
IN
NC
GND
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
RT
NC
PG
BD
NC
BOOST
NC
SW
17
GND
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*FB FOR LT3990, V
OUT
FOR LT3990-3.3, LT3990-5
ORDER INFORMATION
LEAD FREE FINISH
LT3990EDD#PBF
LT3990IDD#PBF
LT3990EMSE#PBF
LT3990IMSE#PBF
LT3990HMSE#PBF
LT3990EMSE-3.3#PBF
LT3990IMSE-3.3#PBF
LT3990HMSE-3.3#PBF
LT3990EMSE-5#PBF
LT3990IMSE-5#PBF
LT3990HMSE-5#PBF
TAPE AND REEL
LT3990EDD#TRPBF
LT3990IDD#TRPBF
LT3990EMSE#TRPBF
LT3990IMSE#TRPBF
LT3990HMSE#TRPBF
LT3990EMSE-3.3#TRPBF
LT3990IMSE-3.3#TRPBF
LT3990EMSE-5#TRPBF
LT3990IMSE-5#TRPBF
LT3990HMSE-5#TRPBF
PART MARKING*
LFWJ
LFWJ
3990
3990
3990
399033
399033
39905
39905
39905
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°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
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
LT3990HMSE-3.3#TRPBF 399033
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
3990fa
2
LT3990/LT3990-3.3/LT3990-5
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Quiescent Current from V
IN
LT3990 Feedback Voltage
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
1.9
MAX
4.2
1.2
2.8
4
1.225
1.235
3.34
3.366
5.06
5.1
20
0.01
2.76
1008
252
865
540
2
2
2
1.8
12
30
1.28
13.5
1
UNITS
V
µA
µA
µA
V
V
V
V
V
V
nA
%/V
MHz
kHz
kHz
mA
mA
mV
µA
mV
µA
mV
µA
V
mA
nA
V
mV
%
%
µA
µA
ns
V
EN/UVLO
Low
V
EN/UVLO
High
V
EN/UVLO
High
l
1.195
1.185
3.26
3.234
4.94
4.9
1.21
1.21
3.3
3.3
5
5
0.1
0.0002
LT3990-3.3 Output Voltage
l
LT3990-5 Output Voltage
l
LT3990 FB Pin Bias Current (Note 3)
FB/Output Voltage Line Regulation
Switching Frequency
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/UVLO
= 12V
EN/UVLO Rising, V
IN
≥ 4.2V
V
FB
Rising
V
PG
= 3V
V
PG
= 0.4V
V
IN
= 10V
l
1.84
672
168
535
360
2.3
840
210
700
450
210
0.05
725
0.05
900
0.02
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/UVLO Pin Current
EN/UVLO Voltage Threshold
EN/UVLO Voltage Hysteresis
PG Threshold Offset from Feedback Voltage
PG Hysteresis as % of Output Voltage
PG Leakage
PG Sink Current
Minimum Switch On-Time
Minimum Switch Off-Time
l
1.4
8.5
1
l
1.14
6.5
1.19
35
10
1.0
0.01
l
30
80
115
100
160
l
ns
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 LT3990E 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
LT3990I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3990H 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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