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LT3680IMSE#TRPBF

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LT3680
1
3680fb
36V, 3.5A, 2.4MHz
Step-Down Switching Regulator
with 75µA Quiescent Current
The LT
®
3680 is an adjustable frequency (200kHz to
2.4MHz) monolithic buck switching regulator that accepts
input voltages up to 36V. A high effi ciency 95m 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. Low ripple Burst Mode
®
operation
maintains high effi ciency at low output currents while
keeping output ripple below 15mV in a typical application.
In addition, the LT3680 can further enhance low output
current effi ciency 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 fl ag signals when V
OUT
reaches
91% of the programmed output voltage. The LT3680 is
available in 10-Pin MSOP and 3mm × 3mm DFN packages
with exposed pads for low thermal resistance.
■
Automotive Battery Regulation
■
Power for Portable Products
■
Distributed Supply Regulation
■
Industrial Supplies
■
Wall Transformer Regulation
■
Wide Input Voltage Range: 3.6V to 36V
■
3.5A Maximum Output Current
■
Low Ripple (<15mV
P-P
) Burst Mode
®
Operation:
I
Q
= 75μA at 12V
IN
to 3.3V
OUT
■
Adjustable Switching Frequency: 200kHz to 2.4MHz
■
Low Shutdown Current: I
Q
< 0.5μA
■
Integrated Boost Diode
■
Synchronizable Between 250kHz to 2MHz
■
Power Good Flag
■
Saturating Switch Design: 95m On-Resistance
■
0.790V Feedback Reference Voltage
■
Output Voltage: 0.79V to 30V
■
Thermal Protection
■
Soft-Start Capability
■
Small 10-Pin Thermally Enhanced MSOP and
(3mm × 3mm) DFN Packages
5V Step-Down Converter
SW
FB
V
C
PG
RT
V
IN
BD
V
IN
6.3V TO 36V
V
OUT
5V
3.5A
10μF
0.47μF
680pF
47μF
100k
15k
63.4k
4.7μH
536k
GND
OFF ON
LT3680
3680 TA01a
RUN/SS BOOST
SYNC
Effi ciency
OUTPUT CURRENT (A)
0 0.5
50
EFFICIENCY (%)
70
100
1
2
2.5
3680 G01
60
90
80
1.5
3
3.5
V
IN
= 12V
V
IN
= 34V
V
OUT
= 5V
L = 4.7μH
f = 600kHz
V
IN
= 24V
TYPICAL APPLICATION
DESCRIPTION
FEATURES
APPLICATIONS
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
LT3680
2
3680fb
V
IN
, RUN/SS Voltage .................................................36V
BOOST Pin Voltage ...................................................56V
BOOST Pin Above SW Pin .........................................30V
FB, RT, V
C
Voltage .......................................................5V
PG, BD, SYNC Voltage ..............................................30V
(Note 1)
Operating Junction Temperature Range (Note 2)
LT3680E ............................................. –40°C to 125°C
LT3680I.............................................. –40°C to 125°C
LT3680H ............................................ –40°C to 150°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only) ....................................................... 300°C
TOP VIEW
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
11
2
1
RT
V
C
FB
PG
SYNC
BD
BOOST
SW
V
IN
RUN/SS
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
PG
SYN
C
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
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
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3680EDD#PBF LT3680EDD#TRPBF LCYK 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3680IDD#PBF LT3680IDD#TRPBF LCYK 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3680EMSE#PBF LT3680EMSE#TRPBF LTCYM 10-Lead Plastic MSOP –40°C to 125°C
LT3680IMSE#PBF LT3680IMSE#TRPBF LTCYM 10-Lead Plastic MSOP –40°C to 125°C
LT3680HMSE#PBF LT3680HMSE#TRPBF LTCYM 10-Lead Plastic MSOP –40°C to 150°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ABSOLUTE MAXIMUM RATINGS
LT3680
3
3680fb
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
3 3.6 V
Quiescent Current from V
IN
V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BD
= 3V, Not Switching
●
30 65 μA
V
BD
= 0, Not Switching 120 160 μA
Quiescent Current from BD V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BD
= 3V, Not Switching
●
90 130 μA
V
BD
= 0, Not Switching 15 μA
Minimum Bias Voltage (BD Pin) 2.7 3 V
Feedback Voltage
●
780
775
790
790
800
805
mV
mV
FB Pin Bias Current (Note 3) V
FB
= 0.8V, V
C
= 0.4V
●
10 40 nA
FB Voltage Line Regulation 4V < V
IN
< 36V 0.002 0.01 %/V
Error Amp g
m
500 μMho
Error Amp Gain 2000
V
C
Source Current 60 μA
V
C
Sink Current 60 μA
V
C
Pin to Switch Current Gain 5.3 A/V
V
C
Clamp Voltage 2.0 V
Switching Frequency R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
2.2
1.0
200
2.45
1.1
230
2.7
1.25
260
MHz
MHz
kHz
Minimum Switch Off-Time
●
60 150 nS
Switch Current Limit Duty Cycle = 5% 4.6 5.4 6.0 A
Switch V
CESAT
I
SW
= 3.5A 335 mV
Boost Schottky Reverse Leakage V
BOOST
= 10V, V
BD
= 0V 0.02 2 μA
Minimum Boost Voltage (Note 4)
●
1.5 2.0 V
BOOST Pin Current I
SW
= 1A 35 50 mA
RUN/SS Pin Current V
RUN/SS
= 2.5V 5 8 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 65 mV
PG Hysteresis 10 mV
PG Leakage V
PG
= 5V 0.1 1 μA
PG Sink Current V
PG
= 0.4V
●
200 800 μA
SYNC Low Threshold 0.5 V
SYNC High Threshold 0.7 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 LT3680E is guaranteed to meet performance specifi cations
from 0°C to 125°C. Specifi cations over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3680I specifi cations are
guaranteed over the –40°C to 125°C temperature range. The LT3680H
specifi cations are guaranteed over the –40°C to 150°C operating
temerature range. High junction temperatures degrade operating lifetimes.
Operating lifetime is derated at junction temperatures greater than 125°C.
Note 3: Bias current fl ows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations 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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LT3680IMSE#TRPBF

Mfr. #:
Buy LT3680IMSE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 36V, 3.5A, 2.4MHz uPwr Step Down Regulator in MSOP
Lifecycle:
New from this manufacturer.
Delivery:
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