LTC1149 查看數據表（PDF） - Linear Technology
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LTC1149 Datasheet PDF : 20 Pages
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LTC1149
LTC1149-3.3/LTC1149-5
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 12V, V10 = 0V (Note 2), unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
V9 – V8
V10
V15
I15
I6
tOFF
tr, tf
Current Sense Threshold Voltage
LTC1149
LTC1149-3.3
LTC1149-5
Shutdown 1 Threshold
LTC1149-3.3, LTC1149-5
Shutdown 2 Threshold
Shutdown 2 Input Current
CT Pin Discharge Current
Off-Time (Note 4)
Driver Output Transition Times
V8 = 5V, V10 = 1.32V (Forced)
V8 = VOUT – 100mV
V8 = 3.5V (Forced)
V8 = VOUT – 100mV
V8 = 5.3V (Forced)
V8 = VOUT – 100mV
V15 = 5V
VOUT In Regulation, VSENSE– = VOUT
VOUT = 0V
CT = 390pF, ILOAD = 700mA
CL = 3000pF (Pins 4, 13), VIN = 6V
25
q
130 150 170
25
q
130 150 170
25
q
130 150 170
0.5
0.8
2
0.8
1.4
2
18
25
50
70
90
2
10
4
5
6
100 200
UNITS
mV
mV
mV
mV
mV
mV
V
V
µA
µA
µA
µs
ns
– 40°C ≤ TA ≤ 85°C (Note 5), unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
V10
VOUT
I2
VCC
V9 – V8
Feedback Voltage LTC1149 Only
Regulated Output Voltage
LTC1149-3.3
LTC1149-5
Input DC Supply Current (Note 3)
Normal Mode
Burst Mode
Shutdown
Internal Regulator Voltage
(Sets MOSFET Gate Drive Levels)
Current Sense Threshold Voltage
VIN = 9V
ILOAD = 700mA
ILOAD = 700mA
VIN = 12V
VIN = 48V
VIN = 12V
VIN = 48V
VIN = 12V, V15 = 2V
VIN = 48V, V15 = 2V
VIN = 12V to 48V
I3 = 20mA
Low Threshold (Forced)
High Threshold (Forced)
1.2
1.25
1.3
V
3.17 3.33
3.43
V
4.85 5.05
5.2
V
2.0
3.2
mA
2.2
3.5
mA
0.6 1.05
mA
0.8 1.30
mA
135 230
µA
300 520
µA
9.75 10.25 11
V
25
mV
125 150 175
mV
V15
Shutdown 2 Threshold
tOFF
Off-Time (Note 4)
CT = 390pF, ILOAD = 700mA, VIN = 10V
0.8
1.4
2
V
3.8
5
6
µs
The q denotes specifications which apply over the full operating
temperature range.
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1149CN, LTC1149CN-3.3, LTC1149CN-5: TJ = TA + (PD )(70°C/W)
LTC1149CS, LTC1149CS-3.3, LTC1149CS-5: TJ = TA + (PD)(110°C/W)
Note 2: Pin 10 is a shutdown pin on the LTC1149-3.3 and LTC1149-5
fixed output voltage versions and must be at ground potential for testing.
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. The allowable operating frequency
may be limited by power dissipation at high input voltages. See Typical
Performance Characteristics and Applications Information.
Note 4: In applications where RSENSE is placed at ground potential, the off-
time increases approximately 40%.
Note 5: The LTC1149, LTC1149-3.3, and LTC1149-5 are not tested and
not quality assurance sampled at – 40°C and 85°C. These specifications
are guaranteed by design and/or correlation.
3
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