LT3991EMSE-3.3#PBF Linear Technology, LT3991EMSE-3.3#PBF Datasheet - Page 21

• Manufacturer Part Number: LT3991EMSE-3.3#PBF
• Description: IC, DC-DC CONV, 2MHz, MSOP10
• Manufacturer: Linear Technology

Specifications of LT3991EMSE-3.3#PBF

• Primary Input Voltage: 55V
• No. Of Outputs: 1
• Output Voltage: 3.3V
• Output Current: 1.2A
• No. Of Pins: 10
• Operating Temperature Range: -40°C To +125°C
• Peak Reflow Compatible (260 C): Yes
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TYPICAL APPLICATIONS
200mV/DIV
10V/DIV
1A/DIV
+
–
V
OUT
48V
V
R
IN
I
L
Sourcing a Maximum Load Pulse
+
C
100µF
BULK
500µs/DIV
4.7µF
10M
432k
4V Step-Down Converter with a High Impedance Input Source
100k
2nF
118k
f = 400kHz
3991 TA07b
EN
PG
SS
RT
SYNC
V
IN
LT3991
GND
BOOST
SW
BD
FB
LT3991/LT3991-3.3/LT3991-5
412k
2V/DIV
2V/DIV
1A/DIV
0.47µF
10pF
V
OUT
V
IN
I
Start-Up from High Impedance Input Source
L
10µH
1M
3991 TA07a
100µF
V
4V
1.2A*
OUT
2ms/DIV
* AVERAGE OUTPUT POWER CANNOT
EXCEED THAT WHICH CAN BE PROVIDED
BY HIGH IMPEDANCE SOURCE.
INTERNAL SOURCE IMPEDANCE, AND η IS
LT3971 EFFICIENCY. MAXIMUM OUTPUT
CURRENT OF 1.2A CAN BE SUPPLIED FOR A
SHORT TIME BASED ON THE ENERGY
WHICH CAN BE SOURCED BY THE BULK
INPUT CAPACITANCE.
NAMELY,
WHERE V IS VOLTAGE OF SOURCE, R IS
P
OUT(MAX)
=
V
4R
2
3991 TA07c
• η
21
3991fa