OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LT3990HMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LT3990/LT3990-3.3/LT3990-5
1
3990fa
TYPICAL APPLICATION
DESCRIPTION
62V, 350mA Step-Down
Regulator with 2.5µA
Quiescent Current and
Integrated Diodes
The LT
®
3990 is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage
range up to 62V, and consumes only 2.5µA of quiescent
current. A high efficiency switch is included on the die
along with the catch diode, boost diode, and the neces-
sary oscillator, control and logic circuitry. Low ripple Burst
Mode operation maintains high efficiency at low output
currents while keeping the output ripple below 5mV in a
typical application. Current mode topology is used for fast
transient response and good loop stability. A catch diode
current limit provides protection against shorted outputs
and overvoltage conditions. An accurate programmable
undervoltage lockout feature is available, producing a low
shutdown current of 0.7µA. A power good flag signals when
V
OUT
reaches 90% of the programmed output voltage. The
LT3990 is available in small, thermally enhanced 16-pin
MSOP and 3mm × 3mm DFN packages.
5V Step-Down Converter
FEATURES
APPLICATIONS
n
Low Ripple Burst Mode
®
Operation
2.5µA I
Q
at 12V
IN
to 3.3V
OUT
Output Ripple < 5mV
P-P
n
Wide Input Voltage Range: 4.2V to 62V Operating
n
Adjustable Switching Frequency: 200kHz to 2.2MHz
n
Integrated Boost and Catch Diodes
n
350mA Output Current
n
Fixed Output Voltages: 3.3V, 5V
2µA I
Q
at 12V
IN
n
Accurate Programmable Undervoltage Lockout
n
FMEA Fault Tolerant (MSOP Package)
Output Stays at or Below Regulation Voltage During
Adjacent Pin Short or When a Pin is Left Floating
n
Low Shutdown Current: I
Q
= 0.7µA
n
Internal Sense Limits Catch Diode Current
n
Power Good Flag
n
Small, Thermally Enhanced 16-Pin MSOP
and (3mm × 3mm) DFN Packages
n
Automotive Battery Regulation
n
Power for Portable Products
n
Industrial Supplies
Power Loss
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
LOAD CURRENT (mA)
0.001
0.01
POWER LOSS (mW)
10
100
1000
0.01 0.1 1 10 100
3990 TA01b
1
0.1
V
IN
= 12V
V
IN
BOOST
LT3990-5
SWEN/UVLO
PG
RT
0.22µF
22µF
2.2µF
V
IN
6.5V TO 62V
V
OUT
5V
350mA
374k
f = 400kHz
33µH
BD
V
OUT
GND
OFF ON
3990 TA01a
LT3990/LT3990-3.3/LT3990-5
2
3990fa
V
IN
, EN/UVLO Voltage ...............................................62V
BOOST Pin Voltage
...................................................75V
BOOST Pin Above SW Pin
.........................................30V
FB/V
OUT
, RT Voltage .................................................... 6V
PG, BD Voltage
.........................................................30V
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3990EDD#PBF LT3990EDD#TRPBF LFWJ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3990IDD#PBF LT3990IDD#TRPBF LFWJ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3990EMSE#PBF LT3990EMSE#TRPBF 3990 16-Lead Plastic MSOP –40°C to 125°C
LT3990IMSE#PBF LT3990IMSE#TRPBF 3990 16-Lead Plastic MSOP –40°C to 125°C
LT3990HMSE#PBF LT3990HMSE#TRPBF 3990 16-Lead Plastic MSOP –40°C to 150°C
LT3990EMSE-3.3#PBF LT3990EMSE-3.3#TRPBF 399033 16-Lead Plastic MSOP –40°C to 125°C
LT3990IMSE-3.3#PBF LT3990IMSE-3.3#TRPBF 399033 16-Lead Plastic MSOP –40°C to 125°C
LT3990HMSE-3.3#PBF LT3990HMSE-3.3#TRPBF 399033 16-Lead Plastic MSOP –40°C to 150°C
LT3990EMSE-5#PBF LT3990EMSE-5#TRPBF 39905 16-Lead Plastic MSOP –40°C to 125°C
LT3990IMSE-5#PBF LT3990IMSE-5#TRPBF 39905 16-Lead Plastic MSOP –40°C to 125°C
LT3990HMSE-5#PBF LT3990HMSE-5#TRPBF 39905 16-Lead Plastic MSOP –40°C to 150°C
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/
ABSOLUTE MAXIMUM RATINGS
TOP VIEW
11
GND
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
RT
PG
BD
BOOST
SW
FB
EN/UVLO
V
IN
GND
GND
θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
FB/V
OUT
*
FB/V
OUT
*
NC
EN/UVLO
NC
V
IN
NC
GND
16
15
14
13
12
11
10
9
RT
NC
PG
BD
NC
BOOST
NC
SW
TOP VIEW
17
GND
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
PIN CONFIGURATION
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
LT3990/LT3990-3.3/LT3990-5
3
3990fa
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 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.
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)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
4 4.2 V
Quiescent Current from V
IN
V
EN/UVLO
Low
V
EN/UVLO
High
V
EN/UVLO
High
l
0.7
1.9
1.2
2.8
4
µA
µA
µA
LT3990 Feedback Voltage
l
1.195
1.185
1.21
1.21
1.225
1.235
V
V
LT3990-3.3 Output Voltage
l
3.26
3.234
3.3
3.3
3.34
3.366
V
V
LT3990-5 Output Voltage
l
4.94
4.9
5
5
5.06
5.1
V
V
LT3990 FB Pin Bias Current (Note 3)
l
0.1 20 nA
FB/Output Voltage Line Regulation 4.2V < V
IN
< 40V 0.0002 0.01 %/V
Switching Frequency R
T
= 41.2k, V
IN
= 6V
R
T
= 158k, V
IN
= 6V
R
T
= 768k, V
IN
= 6V
1.84
672
168
2.3
840
210
2.76
1008
252
MHz
kHz
kHz
Switch Current Limit V
IN
= 5V, V
FB
= 0V 535 700 865 mA
Catch Schottky Current Limit V
IN
= 5V 360 450 540 mA
Switch V
CESAT
I
SW
= 200mA 210 mV
Switch Leakage Current 0.05 2 µA
Catch Schottky Forward Voltage I
SCH
= 100mA, V
IN
= V
BD
= NC 725 mV
Catch Schottky Reverse Leakage V
SW
= 12V 0.05 2 µA
Boost Schottky Forward Voltage I
SCH
= 50mA, V
IN
= NC, V
BOOST
= 0V 900 mV
Boost Schottky Reverse Leakage V
REVERSE
= 12V 0.02 2 µA
Minimum Boost Voltage (Note 4) V
IN
= 5V
l
1.4 1.8 V
BOOST Pin Current I
SW
= 200mA, V
BOOST
= 15V 8.5 12 mA
EN/UVLO Pin Current V
EN/UVLO
= 12V 1 30 nA
EN/UVLO Voltage Threshold EN/UVLO Rising, V
IN
≥ 4.2V
l
1.14 1.19 1.28 V
EN/UVLO Voltage Hysteresis 35 mV
PG Threshold Offset from Feedback Voltage V
FB
Rising 6.5 10 13.5 %
PG Hysteresis as % of Output Voltage 1.0 %
PG Leakage V
PG
= 3V 0.01 1 µA
PG Sink Current V
PG
= 0.4V
l
30 80 µA
Minimum Switch On-Time 115 ns
Minimum Switch Off-Time V
IN
= 10V
l
100 160 ns
Note 3: Bias current flows into the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

LT3990HMSE#PBF

Mfr. #:
Buy LT3990HMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V, 350mA Step-Down Regulator with 2uA Quiescent Current and Integrated Diodes in DFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet