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PDF LT3663 Data sheet ( Hoja de datos )
| Número de pieza | LT3663 | |
| Descripción | 1.5MHz Step-Down Switching Regulator | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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LT3663
1.2A, 1.5MHz Step-Down
Switching Regulator with
Output Current Limit
FEATURES
n Wide Input Range:
Operation from 7.5V to 36V
Overvoltage Lockout Protects Circuit through 60V
Transients
n Programmable Output Current Limit (0.4A to 1.2A)
n Integrated Boost Diode
n 1.5MHz Fixed Frequency, Peak Current Mode Control
n Low Switch VCESAT: 275mV at 1A
n Internally Compensated
n Thermal Protection
n Thermally Enhanced 2mm × 3mm DFN Package
APPLICATIONS
n Distributed Supply Regulation
n Automotive Battery Regulation
n Industrial Supplies
n Wall Transformer Regulation
DESCRIPTION
The LT®3663 is a 1.5MHz current mode step-down
switching regulator with programmable output current
limit. The current limit accurately controls the system
power dissipation and reduces the size of the power path
components.
The wide operating input voltage range of 7.5V to 36V (60V
transient) suits the LT3663 to a variety of input sources,
including unregulated 12V wall adapters, 24V industrial
supplies, and automotive power.
The LT3663 includes a low current shutdown mode, input
overvoltage and undervoltage lockout, and thermal shut-
down. Internal compensation and boost diode minimize
the number of external exponents.
The LT3663 is available in an 8-lead (2mm × 3mm) package
with an exposed pad for low thermal resistance.
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.
TYPICAL APPLICATION
5V Step-Down Converter
VIN
2.2μF
ON OFF
28.7k
VIN BOOST
LT3663
SW
RUN
ISENSE
ILIM VOUT
GND
FB
3663 TA01
0.1μF
6.8μH
VOUT
59k 22μF
11k
Efficiency
100
90 VIN = 8V
80 VIN = 15V
VIN = 30V
70
60
50
40
0.1
0.3 0.5 0.7 0.9 1.1 1.3
OUTPUT CURRENT (A)
3663 TA01b
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LT3663
PIN FUNCTIONS
VIN (Pin 1): The VIN pin supplies current to the LT3663’s
internal regulator and internal power switch. Capacitively
bypass the pin to ground.
RUN (Pin 2): The Run pin is used to put the LT3663 into
shutdown mode. Tie to ground to shut down the LT3663.
Tie to 2.5V or more for normal operation. If the shutdown
feature is not used, connect this pin to VIN.
FB (Pin 3): The LT3663 regulates the FB pin to 0.8V. Con-
nect the feedback resistor divider tap to this pin.
ILIM (Pin 4): Output Current Limit Program Pin. Connect
a resistor to ground to program the regulator output cur-
rent limit.
VOUT (Pin 5): The VOUT pin is connected to the negative ter-
minal of the internal output current limit sense resistor.
ISENSE (Pin 6): The ISENSE pin is the positive input to the
internal output current limit sense resistor. The ISENSE pin
is also the anode to the internal BOOST diode.
BOOST (Pin 7): The BOOST pin is used to provide a drive
voltage, higher than the input voltage, to the internal power
switch. The BOOST pin is also internally connected to the
cathode of the BOOST diode.
SW (Pin 8): The SW pin is the output of the internal power
switch. Connect this pin to the inductor, catch diode and
boost capacitor.
Exposed Pad (Pin 9): Ground. The Exposed Pad must be
soldered to the PCB and electrically connected to ground.
Use a large ground plane and thermal vias to optimize
thermal performance.
FUNCTIONAL BLOCK DIAGRAM
VIN
VIN
C1
RSENSE1
–
+ A1 3 +
RUN
2.5V INTERNAL
REGULATOR,
REFERENCE,
UVLO AND OVP
SLOPE
COMPENSATION
–
OSCILLATOR
RQ
S
RILIM
ILIM
–
G2 +
VC
INTERNAL
COMPENSATION
–
G1 +
EXPOSED PAD (GND)
Q1 SW
BOOST
DRIVER
D2
ISENSE
+
RSENSE2
–
VOUT
FB
0.8V
C3 D1
L
VOUT
C2
R1
R2
3663 BD
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PACKAGE DESCRIPTION
DCB Package
8-Lead Plastic DFN (2mm × 3mm)
(Reference LTC DWG # 05-08-1718 Rev A)
3.50 ±0.05
2.10 ±0.05
0.70 ±0.05
1.35 ±0.05
1.65 ± 0.05
PACKAGE
OUTLINE
1.35 REF
0.25 ± 0.05
0.45 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
2.00 ±0.10
(2 SIDES)
R = 0.115
R = 0.05
TYP
TYP
5
0.40 ± 0.10
8
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.200 REF
3.00 ±0.10
(2 SIDES)
0.75 ±0.05
0.00 – 0.05
1.35 ±0.10
1.65 ± 0.10
PIN 1 NOTCH
R = 0.20 OR 0.25
× 45° CHAMFER
(DCB8) DFN 0106 REV A
41
0.23 ± 0.05
0.45 BSC
1.35 REF
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
LT3663
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT3663.PDF ] | |
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