LTC3700 查看數據表（PDF） - Linear Technology
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LTC3700 Datasheet PDF : 16 Pages
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LTC3700
ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = VIN2 = 4.2V unless otherwise specified. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
LDO Regulator
VIN2 Input Voltage
Input DC Supply Current
Normal Operation with Buck Enabled
Normal Operation with Buck Undervoltage
Shutdown with Buck Enabled
Shutdown with Buck Undervoltage
Regulated Feedback Voltage
Output Voltage Line Regulation
With Buck Enabled
With Buck Enabled
With Buck Undervoltage
Output Voltage Load Regulation
VFB2 Input Current
LDO Short-Circuit Current
LDO Dropout
Overtemperature Trip Point
Typicals at VIN2 = 4.2V
2.4V ≤ VIN2 ≤ 6V
2.4V ≤ VIN2 ≤ 6V
2.4V ≤ VIN2 ≤ 6V, VITH/RUN = 0V
2.4V ≤ VIN2 ≤ 6V, VITH/RUN = 0V
0°C ≤ TA ≤ 70°C, ILDO = 1mA
–40°C ≤ TA ≤ 85°C, ILDO = 1mA
(Unity-Gain Feedback)
2.65V ≤ VIN ≤ 9.8V
2.4V ≤ VIN2 ≤ 6V, ILDO = 1mA
2.4V ≤ VIN2 ≤ 6V, ILDO = 1mA
1mA ≤ ILOAD ≤ 150mA
VLDO = 0V
VIN2 = 3.3V, ILDO = 150mA
VIN2 = 6V, ILDO = 150mA
(Note 7)
2.4
6
V
50
100
µA
100 150
µA
0
1
µA
8
24
µA
q 0.780 0.800 0.830
V
q 0.765 0.800 0.835
V
0.05
mV/V
4
mV/V
4
mV/V
0.06 0.12 mV/mA
0
10
nA
150 200
mA
270
mV
170
mV
150
°C
Overtemperature Hysteresis
(Note 7)
5
°C
PGOOD
Feedback Voltage PGOOD Threshold
PGOOD High-to-Low
PGOOD Low-to-High
PGOOD On-Resistance
(Note 8)
VFB or VFB2 Falling
VFB or VFB2 Rising
– 12 – 7.5
%
7.5
12
%
VFB or VFB2 Rising
VFB or VFB2 Falling
– 10 – 5.0
%
5.0
10
%
VITH/RUN = 0V, VIN = VIN2 = 4.2V, VPGOOD = 100mV
135 180
Ω
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3700 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 LTC3700 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.
Note 7: Guaranteed by design; not tested in production.
Note 8: PGOOD values are expressed as a percentage difference from the
respective “Regulated Feedback Voltage” as given in the table.
3700f
3
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