lt1765es8-trpbf Linear Technology Corporation, lt1765es8-trpbf Datasheet - Page 3

• Manufacturer Part Number: lt1765es8-trpbf
• Description: Monolithic 3a, 1.25mhz Step-down Switching Regulators
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
The
V
PARAMETER
FB Input Current
FB Input Resistance
FB Error Amp Voltage Gain
FB Error Amp Transconductance
V
V
V
V
V
Maximum Switch Duty Cycle
Minimum Boost Voltage Above Switch
Boost Current
SHDN Threshold Voltage
SHDN Threshold Current Hysteresis
SHDN Input Current (Shutting Down)
SYNC Threshold Voltage
SYNC Input Frequency
SYNC Pin Resistance
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1765E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the – 40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
C
C
C
C
C
IN
Pin Source Current
Pin Sink Current
Pin to Switch Current Transconductance
Pin 3A I
Pin Minimum Switching Threshold
= 15V, V
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
SW
C
Threshold
= 0.8V, Boost = V
IN
+ 5V, SHDN, SYNC and switch open unless otherwise noted.
CONDITIONS
LT1765 (Adj)
LT1765
LT1765-1.8
LT1765-3.3
LT1765-5
0.4V < V
∆I
V
V
Duty Cycle = 0%
V
I
I
I
SHDN = 60mV Above Threshold
I
SW
SW
SW
SYNC
FB
FB
C
VC
= 1.2V, I
= V
= V
= 3A
= 1A (Note 4)
= 3A (Note 4)
= ±10µA
= 1mA
NOM
NOM
C
< 0.9V
SW
– 17%
+ 17%
= 800mA, V
IN
= 6V
Note 3: Minimum input voltage is defined as the voltage where the internal
regulator enters lockout. Actual minimum input voltage to maintain a
regulated output will depend on output voltage and load current. See
Applications Information.
Note 4: Current flows into the BOOST pin only during the on period of the
switch cycle.
LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
10.5
14.7
1.27
MIN
150
500
– 7
1.6
19
29
80
70
85
80
4
– 0.25
27.5
1.33
TYP
– 10
350
850
120
110
0.4
0.9
1.8
1.5
15
21
42
90
20
70
20
5
7
MAX
1300
– 0.5
1.40
– 13
160
180
140
2.7
2.2
A
21
30
39
60
30
10
2
= 25°C.
UNITS
µMho
1765fb
3
MHz
A/V
mA
mA
kΩ
kΩ
kΩ
kΩ
kΩ
µA
µA
µA
µA
µA
%
%
V
V
V
V
V