LTC3776EUF 查看數據表（PDF） - Linear Technology
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LTC3776EUF
Linear Technology
LTC3776EUF Datasheet PDF : 28 Pages
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LTC3776
ELECTRICAL CHARACTERISTICS The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage Load Regulation
VFB1 Input Current
Overvoltage Protect Threshold
ITH = 0.9V (Note 5)
ITH = 1.7V
(Note 5)
Measured at VFB with Respect to
Regulated Feedback Voltage
0.12 0.5
%
–0.12 –0.5
%
10
50
nA
10
13.3
16
%
Overvoltage Protect Hysteresis
3
%
Top Gate (TG) Drive 1, 2 Rise Time
Top Gate (TG) Drive 1, 2 Fall Time
Bottom Gate (BG) Drive 1, 2 Rise Time
Bottom Gate (BG) Drive 1, 2 Fall Time
Maximum Current Sense Voltage (Channel 1)
(SENSE1+ – SW1)(∆VSENSE(MAX)) (SOURCE)
Maximum Current Sense Voltage (Channel 2)
(SENSE2+ – SW2)(∆VSENSE(MAX)) (SOURCE)
Minimum Current Sense Voltage (Channel 2 Only)
(SENSE2+ – SW2)(∆VSENSE(MAX)) (SINK)
Soft-Start Time
Oscillator and Phase-Locked Loop
CL = 3000pF
CL = 3000pF
CL = 3000pF
CL = 3000pF
IPRG1 = Floating (Note 6)
IPRG1 = 0V
IPRG1 = VIN
IPRG2 = Floating (Note 6)
IPRG2 = 0V
IPRG2 = VIN
IPRG2 = Floating (Note 6)
IPRG2 = 0V
IPRG2 = VIN
Time for VFB1 to Ramp from 0.05V to 0.55V
40
ns
40
ns
50
ns
40
ns
● 110
125
140
mV
● 70
85
100
mV
● 185
204
223
mV
● 127
147
167
mV
● 85
100 105
mV
● 215
245
275
mV
● –130 –112 –94
mV
● –90
–75
–60
mV
● –208 –188 –168
mV
0.667 0.833
1
ms
Oscillator Frequency
Spread Spectrum Frequency Range
Spread Spectrum Disabled (SYNC/SSEN = GND)
PLLLPF = Floating
PLLLPF = 0V
PLLLPF = VIN
SYNC/SSEN = VIN
Minimum Switching Frequency
Maximum Switching Frequency
● 460
550
610
kHz
● 260
300
340
kHz
● 650
750
825
kHz
450
kHz
580
kHz
Phase-Locked Loop Lock Range
SYNC/SSEN Clocked
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
●
200 250
kHz
● 850 1150
kHz
Phase Detector Output Current
Sinking
Sourcing
PGOOD Output
fOSC > fSYNC/FCB
fOSC < fSYNC/FCB
–4
µA
4
µA
PGOOD Voltage Low
PGOOD Trip Level
IPGOOD Sinking 1mA
VFB with Respect to Set Output Voltage
VFB < Regulated Feedback Voltage, Ramping Positive
VFB < Regulated Feedback Voltage, Ramping Negative
VFB > Regulated Feedback Voltage, Ramping Negative
VFB > Regulated Feedback Voltage, Ramping Positive
125
mV
–13 –10.0 –7
%
–16 –13.3 –10
%
7
10.0
13
%
10
13.3
16
%
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3776E is guaranteed to meet specified performance from
0°C to 70°C. Specifications over the –40°C to 85°C operating 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 gate charge being
delivered at the switching frequency.
Note 5: The LTC3776 is tested in a feedback loop that servos ITH to a
specified voltage and measures the resultant VFB voltage.
Note 6: Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as shown in Figure 2.
3776f
3
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