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LT3970EMS-3.3#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LT3970 Series
1
3970fc
Typical applicaTion
DescripTion
40V, 350mA Step-Down
Regulator with 2.5µA
Quiescent Current and
Integrated Diodes
The LT
®
3970 is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage
range up to 40V, 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 over
voltage conditions. An enable pin with accurate
threshold 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 LT3970 is
available in small 10-pin MSOP and 3mm × 2mm DFN
packages.
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.
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 40V 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, 3.42V, 5V
1.8µA I
Q
at 12V
IN
n
Accurate 1V Enable Pin Threshold
n
Low Shutdown Current: I
Q
= 0.7µA
n
Internal Sense Limits Catch Diode Current
n
Power Good Flag
n
Output Voltage: 1.21V to 25V
n
Internal Compensation
n
Small 10-Pin MSOP and (3mm × 2mm) DFN Packages
n
Automotive Battery Regulation
n
Power for Portable Products
n
Industrial Supplies
V
IN
BOOST
LT3970
SWEN
PG
RT
0.22µF
22pF
22µF
2.2µF
V
IN
6V TO 40V
V
OUT
5V
350mA
1M
316k
226k
f = 600kHz
22µH
BD
FB
GND
OFF ON
3490 TA01a
Efficiency
LOAD CURRENT (mA)
50
EFFICIENCY (%)
POWER LOSS (mW)
70
90
40
60
80
0.01 1 10 100
3970 TA01b
1
10
100
1000
0.01
0.1
0.1
V
IN
= 12V
LT3970 Series
2
3970fc
V
IN
, EN Voltage .........................................................40V
BOOST Pin Voltage ...................................................55V
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
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#PBF LT3970EMS#TRPBF LTFDB 10-Lead Plastic MSOP –40°C to 125°C
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#PBF LT3970IDDB-5#TRPBF LFQF
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
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
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
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
*FB/V
OUT
EN
V
IN
GND
GND
RT
PG
BD
BOOST
SW
6
8
7
9
10
5
4
2
3
1
θ
JA
= 76°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
*FB/V
OUT
EN
V
IN
GND
GND
10
9
8
7
6
RT
PG
BD
BOOST
SW
TOP VIEW
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.
pin conFiguraTion
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
LT3970 Series
3
3970fc
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
l
4 4.2 V
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
l
l
0.7
1.7
1.2
2.7
3.5
4
µA
µA
µA
µA
LT3970 Feedback V
oltage
–40°C to 125°C
–40°C to 150°C
l
l
1.195
1.185
1.18
1.21
1.21
1.21
1.225
1.235
1.235
V
V
V
LT3970-3.3 Output V
oltage
–40°C to 125°C
–40°C to 150°C
l
l
3.26
3.234
3.217
3.3
3.3
3.3
3.34
3.366
3.366
V
V
V
LT3970-3.42 Output V
oltage
–40°C to 125°C
l
3.379
3.352
3.42
3.42
3.461
3.488
V
V
LT3970-5 Output V
oltage
–40°C to 125°C
–40°C to 150°C
l
l
4.94
4.9
4.875
5
5
5
5.06
5.1
5.1
V
V
V
LT3970 FB Pin Bias Current (Note 3) 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
1.76
640
160
2.25
800
200
2.64
960
240
MHz
kHz
kHz
Switch Current Limit V
IN
= 5V, V
FB
= 0V 535 700 865 mA
Catch Schottky Current Limit V
IN
= 5V 350 400 500 mA
Switch V
CESAT
I
SW
= 200mA 175 mV
Switch Leakage Current 0.05 2 µA
Catch Schottky Forward Voltage I
SCH
= 100mA, V
IN
= V
BD
= NC 650 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 875 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 7 10 mA
EN Pin Current V
EN
= 12V 1 30 nA
LT3970 EN Voltage Threshold EN Rising, V
IN
≥ 4.2V
l
0.94 1 1.06 V
LT3970-X EN Voltage Threshold EN Rising, V
IN
≥ 4.2V
l
0.93 1 1.07 V
EN Voltage Hysteresis 30 mV
LT3970 PG Threshold Offset from Feedback Voltage V
FB
Rising 80 120 160 mV
LT3970 PG Hysteresis 12 mV
LT3970-X PG Threshold Offset from Output Voltage V
FB
Rising 6.5 10 13.5 %
LT3970-X 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 90 ns
Minimum Switch Off-Time V
IN
= 10V
l
100 160 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

LT3970EMS-3.3#PBF

Mfr. #:
Buy LT3970EMS-3.3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 40V, 350mA Step-Down Regulator with 2uA Quiescent Current and Integrated Diodes
Lifecycle:
New from this manufacturer.
Delivery:
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