lt3505ems8e-trpbf Linear Technology Corporation, lt3505ems8e-trpbf Datasheet - Page 3

• Manufacturer Part Number: lt3505ems8e-trpbf
• Description: 1.2a, Step-down Switching Regulator In 3mm X 3mm Dfn
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
PARAMETER
V
Undervoltage Lockout
Feedback Voltage
FB Pin Bias Current
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
Maximum Duty Cycle
Error Amp Transconductance
Error Amp Voltage Gain
V
V
V
V
R
Switch Current Limit
Switch V
Switch Leakage Current
Minimum Boost Voltage Above Switch
BOOST Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN 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 LT3505E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3505I specifi cations are
guaranteed over the –40°C to 125°C temperature range.
temperature range, otherwise specifi cations are at T
IN
C
C
C
C
T
Source Current
Sink Current
Switching Threshold Voltage
Clamp Voltage
Bias Voltage
Operating Range
CESAT
CONDITIONS
V
Not Switching, R
V
V
V
V
V
R
V
V
V
V
I
V
V
V
(Note 3)
I
I
I
V
V
OUT
SW
SW
SW
FB
SHDN
IN
FB
FB
FB
FB
FB
FB
FB
FB
FB
FB
SHDN
SHDN
T
= 75.0k
= 5V to 36V
= Measured V
= 0.7V, R
= 0.7V, R
= 0.7V, R
= 0.78V
= 0.78V
= 0V, V
= 1V, V
= 0V
= 0.6V
= 0V, R
= 1A
= 1A
= 1A
= 0mA
= 0V
= 2.3V (Note 5)
= 0V
C
C
T
= 1.5V
= 1.5V
= 75.0k
T
T
T
= 13.7k
= 75.0k
= 357k
T
A
REF
= 75.0k
= 25°C, V
(Note 4)
The
"
IN
denotes the specifi cations which apply over the full operating
= 12V, V
Note 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4: Current fl ows out of pin.
Note 5: Current fl ows into pin.
BOOST
= 17V, unless otherwise noted. (Note 2).
"
"
"
2.70
MIN
765
675
180
3.6
3.1
1.4
2.3
90
0.007
3.35
0.01
3.01
1.75
0.01
TYP
780
750
200
200
400
350
2.0
0.9
1.7
0.5
0.1
1.6
55
94
10
14
50
24
6
LT3505
MAX
3.30
795
150
825
220
3.6
2.7
2.2
2.2
0.3
0.1
36
50
20
2
2
UNITS
3505fc
µA/V
3
MHz
%/V
kHz
kHz
V/V
mV
mA
mV
mV
mA
nA
µA
µA
µA
µA
µA
µA
%
V
V
V
V
V
A
V
V
V