LT3663EMS8E-5#PBF Linear Technology, LT3663EMS8E-5#PBF Datasheet - Page 5

• Manufacturer Part Number: LT3663EMS8E-5#PBF
• Description: IC BUCK 5V 1.2A 8MSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT3663EMS8E-5#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 1.2A
• Frequency - Switching: 1MHz
• Voltage - Input: 7.5 ~ 36 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP Exposed Pad, 8-HMSOP, 8-eMSOP
• Primary Input Voltage: 36V
• No. Of Outputs: 1
• Output Voltage: 5V
• Output Current: 1.2A
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Switching Frequency Max: 1.65MHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
BOOST: 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.
GND (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.
FB (LT3663): The LT3663 regulates the FB pin to 0.8V.
Connect the feedback resistor divider tap to this pin.
I
to ground to program the regulator output current limit.
I
output current limit sense resistor. The I
the anode to the internal BOOST diode.
LIM
SENSE
400
350
300
250
200
150
100
: Output Current Limit Program Pin. Connect a resistor
50
0
0
Switch Voltage Drop
: The I
0.2
SENSE
SWITCH CURRENT (A)
0.4
pin is the positive input to the internal
0.6
0.8
1
125°C
–45°C
25°C
3663 G01
1.2
SENSE
1.4
1.2
0.8
0.6
0.4
0.2
1
0
0
Boost Diode V
pin is also
50
DIODE CURRENT (mA)
100
f
150
RUN: 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 V
SW: The SW pin is the output of the internal power switch.
Connect this pin to the inductor, catch diode and boost
capacitor.
V
regulator and internal power switch. Capacitively bypass
the pin to ground.
V
of the internal output current limit sense resistor.
V
the positive terminal of the output capacitor.
OUT
OUTS
IN
: The V
200
: The V
(LT3663-X): Output Voltage Sense Pin. Connect to
250
IN
3653 G09
OUT
T
pin supplies current to the LT3663’s internal
A
300
= 25°C, unless otherwise noted.
pin is connected to the negative terminal
35
30
25
20
15
10
5
0
0
BOOST Pin Current
0.2
IN
.
SWITCH CURRENT (A)
0.4
0.5
LT3663
0.8
1.0
3653 G07
3663fb
5
1.2