LT3991EMSE-3.3#PBF Linear Technology, LT3991EMSE-3.3#PBF Datasheet - Page 8
LT3991EMSE-3.3#PBF
Manufacturer Part Number
LT3991EMSE-3.3#PBF
Description
IC, DC-DC CONV, 2MHz, MSOP10
Manufacturer
Linear Technology
Datasheet
1.LT3991EDDPBF.pdf
(24 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT3991EMSE-3.3#PBFLT3991EMSE-3.3
Manufacturer:
Linear Technology
Quantity:
135
PG (Pin 9): The PG pin is the open-drain output of an
internal comparator. PGOOD remains low until the FB pin
is within 9% of the final regulation voltage. PGOOD is
valid when the LT3991 is enabled and V
SYNC (Pin 10): This is the external clock synchronization
input. Ground this pin for low ripple Burst Mode operation
LT3991/LT3991-3.3/LT3991-5
PIN FUNCTIONS
BLOCK DIAGRAM
8
V
IN
C1
R
T
V
EN
RT
SYNC
PG
IN
GND
1V
+
–
INTERNAL 1.19V REF
+
–
SHDN
R2
1.09V
FB
R1
C5
ERROR AMP
LT3991
ONLY
+
–
IN
Σ
R2
is above 4.3V.
200kHz TO 2MHz
V
C5
SLOPE COMP
R1
OSCILLATOR
C
LT3991-3.3
V
LT3991-5
–
+
OUT
ONLY
Burst Mode
V
C
DETECT
CLAMP
at low output loads. Tie to a clock source for synchroni-
zation, which will include pulse-skipping at low output
loads. When in pulse-skipping mode, quiescent current
increases to 1.5mA.
GND (Exposed Pad Pin 11): Ground. The exposed pad
must be soldered to PCB.
R
S
SWITCH
LATCH
Q
SHDN
1µA
BOOST
SW
BD
SS
D1
C3
C4
L1
3991 BD
C2
3991fa
V
OUT