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LT3973EDD-5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3973/LT3973-3.3/LT3973-5
1
3973fb
For more information www.linear.com/LT3973
TYPICAL APPLICATION
DESCRIPTION
42V, 750mA Step-Down
Regulator with 2.5µA
Quiescent Current and
Integrated Diodes
The LT
®
3973 is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage range
up to 42V, 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 necessary oscillator,
control and logic circuitry. Low ripple Burst Mode operation
maintains high efficiency at low output currents while keep
-
ing the output ripple below 10mV in a typical application.
A
minimum dropout voltage of 530mV is maintained when
the input voltage drops below the programmed output volt
-
age, such as during automotive cold crank. 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, with
thermal shutdown providing additional fault protection. An
accurate programmable undervoltage lockout feature is
available, producing a low shutdown current of 0.75µA.
A power good flag signals when V
OUT
reaches 90% of
the programmed output voltage. The LT3973 is available
in small, thermally enhanced 10-lead MSOP and 3mm ×
3mm DFN packages.
L, LT , LT C , LTM , Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the
property of their respective
owners.
5V Step-Down Converter
FEATURES
APPLICATIONS
n
Ultralow Quiescent Current
n
2.5µA I
Q
at 12V
IN
to 3.3V
OUT
n
Low Ripple Burst Mode
®
Operation
n
Output Ripple < 10mV
P-P
n
Wide Input Voltage Range: 4.2V to 42V Operating
n
Adjustable Switching Frequency: 200kHz to 2.2MHz
n
Integrated Boost and Catch Diodes
n
750mA Output Current
n
Excellent Start-Up and Dropout Performance
n
Fixed Output Voltages: 3.3V, 5V
n
1.9µA I
Q
at 12V
IN
n
Accurate Programmable Undervoltage Lockout
n
Low Shutdown Current: I
Q
= 0.75µA
n
Internal Catch Diode Current Limit
n
Power Good Flag
n
Thermal Shutdown
n
Small, Thermally Enhanced 10-Lead MSOP and
(3mm × 3mm) DFN Packages
n
Automotive Battery Regulation
n
Power for Portable Products
n
Industrial Supplies
n
Gate Drive Bias
V
IN
BOOST
LT3973
SWEN/UVLO
PG
RT
C3
0.47µF
15pF
C2
22µF
C1
4.7µF
V
IN
5.6V TO 42V
V
OUT
5V
750mA
1M
316k
215k
f = 600kHz
L1
15µH
BD
OUT
FB
GND
OFF ON
3973 TA01a
Efficiency
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
80
70
60
50
90
1000.1 1
3973 TA01b
10
0.01
10
100
1
0.1
1000
V
IN
= 12V
LT3973/LT3973-3.3/LT3973-5
2
3973fb
For more information www.linear.com/LT3973
V
IN
, EN/UVLO Voltage ............................................... 42V
BOOST Pin Voltage ...................................................55V
BOOST Pin Above SW Pin ......................................... 25V
FB/V
OUT
, RT, PG Voltage ............................................. 6V
BD Voltage ................................................................25V
OUT Voltage ..............................................................14V
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3973EDD#PBF LT3973EDD#TRPBF LGCH 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973IDD#PBF LT3973IDD#TRPBF LGCH 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973HDD#PBF LT3973HDD#TRPBF LGCH 10-Lead (3mm × 3mm) Plastic DFN –40°C to 150°C
LT3973EMSE#PBF LT3973EMSE#TRPBF LTFYS 10-Lead Plastic MSOP –40°C to 125°C
LT3973IMSE#PBF LT3973IMSE#TRPBF LTFYS 10-Lead Plastic MSOP –40°C to 125°C
LT3973HMSE#PBF LT3973HMSE#TRPBF LTFYS 10-Lead Plastic MSOP –40°C to 150°C
LT3973EMSE-3.3#PBF LT3973EMSE-3.3#TRPBF LTGGB 10-Lead Plastic MSOP –40°C to 125°C
LT3973IMSE-3.3#PBF LT3973IMSE-3.3#TRPBF LTGGB 10-Lead Plastic MSOP –40°C to 125°C
LT3973HMSE-3.3#PBF LT3973HMSE-3.3#TRPBF LTGGB 10-Lead Plastic MSOP –40°C to 150°C
LT3973EDD-3.3#PBF LT3973EDD-3.3#TRPBF LGGC 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973IDD-3.3#PBF LT3973IDD-3.3#TRPBF LGGC 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973HDD-3.3#PBF LT3973HDD-3.3#TRPBF LGGC 10-Lead (3mm × 3mm) Plastic DFN –40°C to 150°C
LT3973EMSE-5#PBF LT3973EMSE-5#TRPBF LTGGD 10-Lead Plastic MSOP –40°C to 125°C
LT3973IMSE-5#PBF LT3973IMSE-5#TRPBF LTGGD 10-Lead Plastic MSOP –40°C to 125°C
LT3973HMSE-5#PBF LT3973HMSE-5#TRPBF LTGGD 10-Lead Plastic MSOP –40°C to 150°
C
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/V
OUT
OUT
EN/UVLO
V
IN
GND
θ
JA
= 40°C/W, θ
JC
= 5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
*FB/V
OUT
OUT
EN/UVLO
V
IN
GND
10
9
8
7
6
RT
PG
BD
BOOST
SW
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
GND
θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
* FB for LT3973, V
OUT
for LT3973-3.3, LT3973-5.
PIN CONFIGURATION
Operating Junction Temperature Range (Note 2)
LT3973E/LT3973E-X .......................... –40°C to 125°C
LT3973I/LT3973I-X ............................ –40°C to 125°C
LT3973H/LT3973H-X ......................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Only .......................................................... 300°C
LT3973/LT3973-3.3/LT3973-5
3
3973fb
For more information www.linear.com/LT3973
ELECTRICAL CHARACTERISTICS
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 (Note 3)
l
3.8 4.2 V
Quiescent Current from V
IN
V
EN/UVLO
Low
V
EN/UVLO
High
V
EN/UVLO
High, –40°C to 125°C
V
EN/UVLO
High, –40°C to 150°C
l
l
0.75
1.8
1.3
2.8
6
12
µA
µA
µA
µA
LT3973 Feedback V
oltage
l
1.195
1.185
1.21
1.21
1.225
1.235
V
V
LT3973-3.3 Output V
oltage
l
3.26
3.234
3.3
3.3
3.34
3.366
V
V
LT3973-5 Output V
oltage
l
4.94
4.9
5
5
5.06
5.1
V
V
LT3973 FB Pin Bias Current V
FB
= 1.21V
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
1.72
632
156
2.15
790
195
2.58
948
234
MHz
kHz
kHz
Switch Current Limit V
IN
= 5V, V
FB
= 0V
l
1.237 1.65 1.98 A
Catch Schottky Current Limit V
IN
= 5V
l
0.92 1.15 1.44 A
Switch V
CESAT
I
SW
= 500mA 250 mV
Switch Leakage Current 0.05 2 µA
Catch Schottky Forward Voltage I
SCH
= 200mA, V
IN
= V
BD
= NC 550 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 820 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
= 500mA, V
BOOST
= 15V 10 13 mA
Dropout Comparator Threshold (V
IN
- OUT) Falling, V
IN
= 5V
l
400 490 580 mV
Dropout Comparator Hysteresis 40 mV
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3973EDD-5#PBF LT3973EDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973IDD-5#PBF LT3973IDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973HDD-5#PBF LT3973HDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 150°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.Consult LT C 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/
ORDER INFORMATION
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT3973EDD-5#TRPBF

Mfr. #:
Buy LT3973EDD-5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 42V, 750mA, 2.5uA Iq Step-Down Converter
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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