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LT3693IDD#PBF

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LT3693
1
3693f
36V, 3.5A, 2.4MHz
Step-Down Switching Regulator
The LT
®
3693 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. 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 LT3693 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 Range: 3.6V to 36V
■
3.5A Maximum Output Current
■
Adjustable Switching Frequency: 200kHz to 2.4MHz
■
Low Shutdown Current: I
Q
< 1μA
■
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
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
SW
FB
V
C
PG
RT
V
IN
BD
V
IN
6.3V TO 36V
V
OUT
5V
3.5A
10 F
0.47 F
680pF
47 F
100k
15k
63.4k
4.7 H
536k
GND
OFF ON
LT3693
3693 TA01a
RUN/SS BOOST
SYNC
Effi ciency
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OUTPUT CURRENT (A)
0 0.5
50
EFFICIENCY (%)
70
100
1
2
2.5
3693 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
LT3693
2
3693f
ELECTRICAL CHARACTERISTICS
V
IN
, RUN/SS Voltage .................................................36V
BOOST Pin Voltage ...................................................56V
BOOST Pin Above SW Pin .........................................30V
FB, RT, V
C
Voltage .......................................................5V
PG, BD Voltage .........................................................30V
SYNC Voltage ............................................................20V
(Note 1)
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
●
0.45 1.2 mA
V
BD
= 0, Not Switching 1.3 2.3 mA
Quiescent Current from BD V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BD
= 3V, Not Switching
●
0.9 1.8 mA
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)
ABSOLUTE AXI U RATI GS
W
WW
U
Operating Junction Temperature Range (Note 2)
LT3693E ............................................. –40°C to 125°C
LT3693I.............................................. –40°C to 125°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 × 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
SYNC
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
LT3693EDD#PBF LT3693EDD#TRPBF LDGB 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3693IDD#PBF LT3693IDD#TRPBF LDGB 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3693EMSE#PBF LT3693EMSE#TRPBF LTDFZ 10-Lead Plastic MSOP –40°C to 125°C
LT3693IMSE#PBF LT3693IMSE#TRPBF LTDFZ 10-Lead Plastic MSOP –40°C to 125°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/
LT3693
3
3693f
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
BD
= 0, Not Switching 110 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
525 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
SW
= 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 60 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 0.8 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 LT3693E 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 LT3693I specifi cations are
guaranteed over the –40°C to 125°C temperature range.
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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LT3693IDD#PBF

Mfr. #:
Buy LT3693IDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 36V, 3.5A, 2.4MHz Step-Down Switching Reg in DFN
Lifecycle:
New from this manufacturer.
Delivery:
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