LT1912 Linear Technology Corporation, LT1912 Datasheet - Page 3

• Manufacturer Part Number: LT1912
• Description: Step-Down Switching Regulator
• Manufacturer: Linear Technology Corporation

www.DataSheet4U.com
www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
noted. (Note 2)
PARAMETER
Feedback Voltage
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp g
Error Amp Gain
V
V
V
V
Switching Frequency
Minimum Switch Off-Time
Switch Current Limit
Switch V
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
SYNC Low Threshold
SYNC High Threshold
SYNC Pin Bias Current
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1912E is guaranteed to meet performance specifi cations
from 0°C to 125°C. Specifi cations over the –40°C to 125°C operating
C
C
C
C
Source Current
Sink Current
Pin to Switch Current Gain
Clamp Voltage
CESAT
m
CONDITIONS
V
4V < V
R
Duty Cycle = 5%
I
V
I
V
V
SW
SW
FB
T
SW
RUN/SS
SYNC
= 187k
= 0.8V, V
= 2A
= 1A
A
= 10V, V
= 25°C. V
IN
= 0V
= 2.5V
< 36V
The
C
BD
= 0.4V
= 0V
●
IN
denotes the specifi cations which apply over the full operating
= 10V, V
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Bias current fl ows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
RUN/SS
= 10V V
BOOST
= 15V, V
●
●
●
●
MIN
BD
780
775
160
3.2
0.2
0.5
= 3.3V unless otherwise
0.002
1000
0.02
TYP
790
790
200
500
3.5
3.7
1.5
0.1
25
45
45
60
22
7
2
5
LT1912
MAX
0.01
800
805
240
150
4.2
2.1
2.5
0.7
30
35
10
2
UNITS
μMho
3
1912f
%/V
A/V
kHz
mV
mV
mV
mA
nA
μA
μA
nS
μA
μA
μA
V
A
V
V
V
V
V