LTC1779 データシートの表示（PDF） - Linear Technology
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LTC1779 Datasheet PDF : 12 Pages
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LTC1779
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN).........................– 0.3V to 10V
SENSE –, SW Voltages .................. – 0.3V to (VIN + 0.3V)
VFB, ITH/RUN Voltages ..............................– 0.3V to 2.4V
SW Peak Output Current (< 10µs) .......................... 0.5A
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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ITH/RUN 1
GND 2
VFB 3
6 SW
5 VIN
4 SENSE–
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA = 230°C/ W
ORDER PART
NUMBER
LTC1779ES6
S6 PART MARKING
LTLP
Consult LTC Marketing 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
Typicals at VIN = 4.2V (Note 4)
2.5V ≤ VIN ≤ 9.8V
2.5V ≤ VIN ≤ 9.8V, VITH/RUN = 0V
VIN < UVLO Threshold
VIN Falling
VIN Rising
135 240
µA
8
22
µA
7
13
µA
q 1.60
2.0
V
2.1
2.5
V
Shutdown Threshold (at ITH/RUN)
Start-Up Current Source
VITH/RUN = 0V
q 0.15 0.325 0.5
V
0.25
0.5
0.85
µA
Regulated Feedback Voltage
(Note 5) 0°C to 70°C
(Note 5) – 40°C to 85°C
q 0.780 0.800 0.820
V
q 0.770 0.800 0.830
V
Output Voltage Line Regulation
2.5V ≤ VIN ≤ 9.8V (Note 5)
–3
0
3
mV/V
Output Voltage Load Regulation
ITH/RUN Sinking 5µA (Note 5)
ITH/RUN Sourcing 5µA (Note 5)
2.5
mV/µA
2.5
mV/µA
VFB Input Current
(Note 5)
5
25
nA
Overvoltage Protect Threshold
Measured at VFB
0.820 0.860 0.895
V
Overvoltage Protect Hysteresis
30
mV
Overtemperature Protect Threshold
170
°C
Overtemperature Protect Hysteresis
15
°C
Oscillator Frequency
VFB = 0.8V
VFB = 0V
500 550 650
kHz
100
kHz
RDS(ON) of Internal P-Channel FET
VIN = 4.2V, ISW = 100mA
0.85
1.4
Ω
Peak Current Sense Voltage
(Note 6)
120
mV
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1779E is guaranteed to meet performance 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 • θJ°C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC1779 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 upon duty cycle
to a percentage of value as given in Figure 2.
2
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