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LT3980IDE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3980
1
3980fa
For more information www.linear.com/LT3980
58V, 2A, 2.4MHz
Step-Down Switching Regulator
with 85µA Quiescent Current
The LT
®
3980 is an adjustable frequency (100kHz to
2.4MHz) monolithic buck switching regulator that accepts
input voltages up to 58V (80V transient). A high efficiency
200mΩ switch is included on the die along with a boost
Schottky diode and the necessary oscillator, control, and
logic circuitry. Current mode topology is used for fast
transient response and good loop stability. Catch diode
current sense (DA pin) protects the circuit during input
voltage transients even when a high switching frequency
is used. Low ripple Burst Mode operation maintains high
efficiency at low output currents while keeping output
ripple below 15mV in a typical application. In addition, the
LT3980 can further enhance low output current efficiency
by drawing bias current from the output when V
OUT
is
above 3V. Shutdown reduces input supply current to less
than 1µA while a resistor and capacitor on the RUN/SS
pin provide a controlled output voltage ramp (soft-start).
A power good flag signals when V
OUT
reaches 91% of
the programmed output voltage. The LT3980 is available
in 16-pin MSOP and 3mm × 4mm DFN packages with
exposed pads for low thermal resistance.
■
Automotive Battery Regulation
■
Distributed Supply Regulation
■
Industrial Supplies
■
Wall Transformer Regulation
■
Wide Input Range: Operation from 3.6V to 58V
■
Overvoltage Lockout Protects Circuits Through 80V
Transients
■
2A Maximum Output Current
■
Low Ripple (<15mV
P-P
) Burst Mode
®
Operation:
I
Q
= 85µA at 12V
IN
to 3.3V
OUT
■
Adjustable Switching Frequency: 100kHz to 2.4MHz
■
Low Shutdown Current: I
Q
< 1µA
■
Catch Diode Current Sense Protects Circuit Through
Short-Circuit and Input Overvoltage
■
Synchronizable Between 250kHz to 2MHz
■
Power Good Flag
■
Saturating Switch Design: 200mΩ On-Resistance
■
Thermal Protection
■
Soft-Start Capability
■
Small 16-Pin Thermally Enhanced MSOP and
3mm × 4mm DFN Packages
5V Step-Down Converter Efficiency, V
OUT
= 5V
Typical applicaTion
DescripTion
FeaTures
applicaTions
SW
FB
V
C
PG
RT
V
IN
BD
V
IN
6.5V TO 58V
TRANSIENT
TO 80V
V
OUT
5V
2A
10µF
0.47µF
1nF
47µF
100k
4.75k
97.6k
10µH
22pF
536k
GND
DA
OFF ON
LT3980
3980 TA01
RUN/SS BOOST
SYNC
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
I
LOAD
(A)
0 0.5
EFFICIENCY (%)
1
2
3980 TA01b
1.5
V
IN
= 12V
V
IN
= 48V
f = 400kHz
D = DIODES, INC. SBR3U100LP
V
IN
= 24V
85
70
60
55
50
95
90
80
75
65
LT3980
2
3980fa
For more information www.linear.com/LT3980
The ● denotes the specifications which apply over the full operating temper-
ature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
RUN/SS
= 10V, V
BOOST
= 15V, V
BD
= 3.3V unless otherwise noted. (Note 2)
elecTrical characTerisTics
V
IN
, RUN/SS Voltage (Note 5) ................................... 80V
BOOST Pin Voltage ...................................................75V
BOOST Pin Above SW Pin .........................................30V
FB, RT, V
C
Voltage .......................................................5V
PG, BD, SYNC Voltage ..............................................25V
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
3 3.6 V
V
IN
Overvoltage Lockout
●
58 61.5 64 V
Quiescent Current from V
IN
V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
20
70
0.01
35
120
0.5
60
160
µA
µA
µA
Operating Junction Temperature Range (Note 2)
LT3980E
.............................................– 40°C to 125°C
LT3980I
.............................................. –40°C to 125°C
LT3980H ............................................– 40°C to 150°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only)
....................................................... 300°C
1
2
3
4
5
6
7
14
13
12
11
10
9
8
DA
NC
V
IN
SW
BOOST
BD
RUN/SS
SYNC
NC
PG
FB
V
C
RT
GND
TOP VIEW
DE14 PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
15
GND
θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
SYNC
PG
NC
FB
NC
V
C
RT
GND
16
15
14
13
12
11
10
9
NC
DA
V
IN
NC
SW
BOOST
BD
RUN/SS
TOP VIEW
MSE PACKAGE
16-LEAD PLASTIC MSOP
17
GND
θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
pin conFiGuraTion
orDer inFormaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3980EDE#PBF LT3980EDE#TRPBF 3980
14-Lead (3mm × 4mm) Plastic DFN
–40°C to 125°C
LT3980IDE#PBF LT3980IDE#TRPBF 3980
14-Lead (3mm × 4mm) Plastic DFN
–40°C to 125°C
LT3980EMSE#PBF LT3980EMSE#TRPBF 3980 16-Lead Plastic MSOP –40°C to 125°C
LT3980IMSE#PBF LT3980IMSE#TRPBF 3980 16-Lead Plastic MSOP –40°C to 125°C
LT3980HMSE#PBF LT3980HMSE#TRPBF 3980 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
LT3980
3
3980fa
For more information www.linear.com/LT3980
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current from BD V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
55
0.01
82
1
0.5
115
5
µA
µA
µA
Feedback Voltage
●
782
770
790
790
798
805
mV
mV
FB Pin Bias Current (Note 3) V
FB
= 0.8V, V
C
= 1.2V
●
10 40 nA
FB Voltage Line Regulation 4V < V
IN
< 56V 0.002 0.01 %/V
Error Amp g
m
500 µmho
Error Amp Gain 1800
V
C
Source Current 60 µA
V
C
Sink Current 60 µA
V
C
Pin to Switch Current Gain 3.87 A/V
V
C
Clamp Voltage 2 V
Switching Frequency R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
1.95
0.86
195
2.25
1.07
225
2.55
1.27
255
MHz
MHz
kHz
Minimum Switch Off-Time
●
140 230 nS
Switch Current Limit Duty Cycle = 5% 3.3 4 4.9 A
Switch V
CESAT
I
SW
= 2A 540 mV
DA Pin Current to Pause OSC 1.9 2.4 3 A
Boost Schottky Reverse Leakage V
BD
= 0V 0.02 2 µA
Minimum Boost Voltage (Note 4)
●
1.7 2.2 V
BOOST Pin Current I
SW
= 2A 40 55 mA
RUN/SS Pin Current V
RUN/SS
= 2.5V 6 10 µA
RUN/SS Input Voltage High 2.5 V
RUN/SS Input Voltage Low
●
0.4 V
PG Threshold Offset from Feedback Voltage V
FB
Rising
●
50 65 80 mV
PG Hysteresis 14 mV
PG Leakage V
PG
= 5V 0.1 1 µA
PG Sink Current V
PG
= 0.4V
●
200 700 µA
SYNC Threshold 0.575 0.675 0.775 V
SYNC Pin Bias Current V
SYNC
= 0V 0.1 µA
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 LT3980E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3980I specifications are
guaranteed over the –40°C to 125°C temperature range. The LT3980H
specifications are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: Bias current flows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: Absolute Maximum at V
IN
and RUN/SS pins is 80V for non-
repetitive 1 minute transients, and 60V for continuous operation.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
RUN/SS
= 10V, V
BOOST
= 15V, V
BD
= 3.3V unless otherwise
noted. (Note 2)
elecTrical characTerisTics
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LT3980IDE#PBF

Mfr. #:
Buy LT3980IDE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 58V, 2A, 2.4MHz Step-Down Switching Regulator with 75uA Quiescent Current
Lifecycle:
New from this manufacturer.
Delivery:
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