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LT3684EDD#TRPBF

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LT3684
1
3684fa
For more information www.linear.com/LT3684
36V, 2A, 2.8MHz Step-Down
Switching Regulator
The LT
®
3684 is an adjustable frequency (300kHz to 2.8MHz)
monolithic buck switching regulator that accepts input
voltages up to 34V (36V maximum). A high efficiency
0.18Ω 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. The LT3684’s
high operating frequency allows the use of small, low cost
inductors and ceramic capacitors resulting in low output
ripple while keeping total solution size to a minimum.
The low current shutdown mode 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
90% of the programmed output voltage. The LT3684 is
available in 10-Pin MSOP and 3mm × 3mm DFN packages
with Exposed Pads for low thermal resistance.
n
Automotive Battery Regulation
n
Power for Portable Products
n
Distributed Supply Regulation
n
Industrial Supplies
n
Wall Transformer Regulation
n
Wide Input Range: 3.6V to 34V Operating,
36V Maximum
n
2A Maximum Output Current
n
Adjustable Switching Frequency: 300kHz to 2.8MHz
n
Low Shutdown Current: I
Q
< 1µA
n
Integrated Boost Diode
n
Power Good Flag
n
Saturating Switch Design: 0.18Ω On-Resistance
n
1.265V Feedback Reference Voltage
n
Output Voltage: 1.265V to 20V
n
Soft-Start Capability
n
Small 10-Pin Thermally Enhanced MSOP and
(3mm × 3mm) DFN Packages
3.3V Step-Down Converter
Efficiency
FEATURES DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION
SW
BIAS
FB
V
C
PG
RT
V
IN
BD
V
IN
4.5V TO
34V
V
OUT
3.3V
2A
4.7µF
0.47µF
330pF
22µF
200k
16.2k
60.4k
4.7µH
324k
GND
OFF ON
LT3684
3684 TA01a
RUN/SS BOOST
LOAD CURRENT (A)
0
30
EFFICIENCY (%)
40
50
60
70
80
90
0.5 1 1.5 2
3684 TA01b
V
IN
= 12V
V
OUT
= 3.3V
L = 4.7µH
f = 800kHz
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT3684
2
3684fa
For more information www.linear.com/LT3684
V
IN
, RUN/SS Voltage ................................................. 36V
BOOST Pin Voltage
...................................................56V
BOOST Pin Above SW Pin
......................................... 30V
FB, RT, V
C
Voltage ....................................................... 5V
BIAS, PG, BD Voltage
................................................ 30V
Maximum Junction Temperature
.......................... 125°C
(Note 1)
Operating Temperature Range (Note 2)
LT3684E
..............................................–40°C to 85°C
LT3684I
............................................. –40°C to 125°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only)
.......................................................300°C
ABSOLUTE MAXIMUM RATINGS
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
11
2
1
RT
V
C
FB
BIAS
PG
BD
BOOST
SW
V
IN
RUN/SS
T
JMAX
= 125°C, 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
BD
BOOST
SW
V
IN
RUN/SS
10
9
8
7
6
RT
V
C
FB
BIAS
PG
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
http://www.linear.com/product/LT3684#orderinfo
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3684EDD#PBF LT3684EDD#TRPBF LCVT 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LT3684IDD#PBF LT3684IDD#TRPBF LCVT 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3684EMSE#PBF LT3684EMSE#TRPBF LTCVS 10-Lead Plastic MSOP –40°C to 85°C
LT3684IMSE#PBF LT3684IMSE#TRPBF LTCVS 10-Lead Plastic MSOP –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
LT3684
3
3684fa
For more information www.linear.com/LT3684
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
3 3.6 V
Quiescent Current from V
IN
V
RUN/SS
= 0.2V 0.01 0.5 µA
V
BIAS
= 3V, Not Switching
l
0.4 0.8 mA
V
BIAS
= 0, Not Switching 1.2 2.0 mA
Quiescent Current from BIAS V
RUN/SS
= 0.2V 0.01 0.5 µA
V
BIAS
= 3V, Not Switching
l
0.85 1.5 mA
V
BIAS
= 0, Not Switching 0 0.1 mA
Minimum Bias Voltage 2.7 3 V
Feedback Voltage
l
1.25
1.24
1.265
1.265
1.28
1.29
V
V
FB Pin Bias Current (Note 3)
l
30 100 nA
FB Voltage Line Regulation 4V < V
IN
< 34V 0.002 0.02 %/V
Error Amp g
m
330 µMho
Error Amp Gain 1000
V
C
Source Current 75 µA
V
C
Sink Current 100 µA
V
C
Pin to Switch Current Gain 3.5 A/V
V
C
Clamp Voltage 2 V
Switching Frequency
R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
2.7
1.25
250
3.0
1.4
300
3.3
1.55
350
MHz
MHz
kHz
Minimum Switch Off-Time
l
100 150 nS
Switch Current Limit Duty Cycle = 5% 3.1 3.6 4.0 A
Switch V
CESAT
I
SW
= 2A 360 mV
Boost Schottky Reverse Leakage V
SW
= 10V, V
BIAS
= 0V 0.02 2 µA
Minimum Boost Voltage (Note 4)
l
1.6 2.1 V
BOOST Pin Current I
SW
= 1A 18 30 mA
RUN/SS Pin Current V
RUN/SS
= 2.5V 5 10 µA
RUN/SS Input Voltage High 2.5 V
RUN/SS Input Voltage Low 0.2 V
PG Threshold Offset from Feedback Voltage V
FB
Rising 100 mV
PG Hysteresis 10 mV
PG Leakage V
PG
= 5V 0.1 1 µA
PG Sink Current V
PG
= 0.4V
l
100 300 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 LT3684E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3684I specifications are
guaranteed over the –40°C to 125°C temperature range.
Note 3: Bias current measured in regulation. 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.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
RUNS/SS
= 10V V
BOOST
= 15V, V
BIAS
= 3.3V unless otherwise
noted. (Note 2)
ELECTRICAL CHARACTERISTICS
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LT3684EDD#TRPBF

Mfr. #:
Buy LT3684EDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 36V/2A Buck (non BurstMode LT3481)
Lifecycle:
New from this manufacturer.
Delivery:
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