LTC1772B データシートの表示（PDF） - Linear Technology
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LTC1772B Datasheet PDF : 12 Pages
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LTC1772B
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN).........................– 0.3V to 10V
SENSE –, PGATE Voltages ............. – 0.3V to (VIN + 0.3V)
VFB, ITH/RUN Voltages ..............................– 0.3V to 2.4V
PGATE Peak Output Current (< 10µs) ....................... 1A
Storage Ambient Temperature Range ... – 65°C to 150°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Junction Temperature (Note 3) ............................. 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
ITH/RUN 1
GND 2
VFB 3
6 PGATE
5 VIN
4 SENSE–
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA = 230°C/ W
ORDER PART
NUMBER
LTC1772BES6
S6 PART MARKING
LTVU
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise specified. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Input DC Supply Current
Normal Operation
Shutdown
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold (at ITH/RUN)
Start-Up Current Source
Regulated Feedback Voltage
Typicals at VIN = 4.2V (Note 4)
2.4V ≤ VIN ≤ 9.8V, PGATE Logic High
2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V
VIN < UVLO Threshold
VIN Falling
VIN Rising
VITH/RUN = 0V
0°C to 70°C (Note 5)
–40°C to 85°C (Note 5)
270 420
µA
8
22
µA
6
10
µA
q 1.55 2.00 2.35
V
1.85 2.10 2.40
V
q 0.15 0.35 0.55
V
0.25
0.5
0.85
µA
q 0.780 0.800 0.820
V
q 0.770 0.800 0.830
V
Output Voltage Line Regulation
Output Voltage Load Regulation
VFB Input Current
Overvoltage Protect Threshold
Overvoltage Protect Hysteresis
2.4V ≤ VIN ≤ 9.8V (Note 5)
ITH/RUN Sinking 5µA (Note 5)
ITH/RUN Sourcing 5µA (Note 5)
(Note 5)
Measured at VFB
0.820
0.05
2.5
2.5
10
0.860
20
50
0.895
mV/V
mV/µA
mV/µA
nA
V
mV
Oscillator Frequency
Gate Drive Rise Time
Gate Drive Fall Time
Peak Current Sense Voltage
VFB = 0.8V
VFB = 0V
CLOAD = 3000pF
CLOAD = 3000pF
(Note 6)
500 550 650
kHz
120
kHz
40
ns
40
ns
105
mV
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1772BE is guaranteed to meet specifications from␣ 0°C␣ to
70°C. Specifications over the –40°C to 85°C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA°C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC1772B is tested in a feedback loop that servos VFB to the
output of the error amplifier.
Note 6: Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as given in Figure 2.
2
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