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参数资料
| 型号： | LTC3546EUFD |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封装： | 4 X 5 MM, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 23/28页 |
| 文件大小： | 356K |
| 代理商： | LTC3546EUFD |
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LTC3546
4
3546fb
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
junction temperature range, otherwise specications are at TA = 25°C. VIN = VCCA = 3.6V, unless otherwise specied. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ISW1D(LKG)
Switch Leakage Current SW1D
VIN = 6V
VITH1 = VITH2 = 0V
VRUN1 = VRUN2 = 0V
0.01
1
μA
ISW2A/B(LKG)
Switch Leakage Current SW2A/B
VIN = 6V
VITH2 = 0V
VRUN2 = 0V
0.01
1
μA
VUVLO
Undervoltage Lockout Threshold
VIN1, VIN2, VCCA, VCCD Rising
VIN1, VIN2, VCCA, VCCD Falling
2.03
1.86
2.14
1.97
2.2
2.03
V
TPGOOD1
Threshold for Power Good
Percentage Deviation from Regulated VFB1
(Typically 0.6V).
VFB1 Ramping Up, VSYNC/MODE = 0V
–8
%
TPGOOD2
Threshold for Power Good
Percentage Deviation from Regulated VFB2
(Typically 0.6V).
VFB2 Ramping Up, VSYNC/MODE = 0V
–8
%
RPGOOD1
Power Good Pull-Down On-Resistance
132
300
Ω
RPGOOD2
Power Good Pull-Down On-Resistance
132
300
Ω
tSS
Soft-Start Internal Time.
VFB from 0% to 95%, VTRACK/SS Is Floating
0.8
1.2
1.9
ms
VRUN1, VRUN2,
VPHASE
RUN1, RUN2, and PHASE Threshold
0.3
0.8
1.2
V
IRUN1, IRUN2,
IPHASE
RUN1, RUN2, and PHASE Leakage Current VIN = 6V, VPHASE = 3V, VRUN1 = VRUN2 = 3V
±0.01
±1
μA
VTLSYNC/MODE SYNC/MODE Threshold Voltage Low to Put
the Part into Pulse-Skipping Mode
0.5
V
VTHSYNC/MODE SYNC/MODE Threshold Voltage High to
Put the Part into Burst Mode Operation
VIN – 0.5
V
VSYNC/MODE
SYNC/MODE Threshold for Clock
Synchronization
0.3
0.8
1.2
V
ISYNC/MODE
SYNC/MODE Leakage Current
VIN = 6V, VSYNC/MODE = 3V
±0.01
±1
μA
VTHFREQ
FREQ Threshold Voltage High
VIN – 0.85
V
IBMC1, IBMC2
BMC1, BMC2 Leakage Current
VIN = 6V, VBMC = 3V
±0.4
μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3546E is guaranteed to meet performance specications
from 0°C to 85°C. Specications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3546I is guaranteed
to meet performance specications over the full –40°C to 125°C operating
junction temperature range
Note 3: The LTC3546 is tested in feedback loop which servos VFB1 to the
midpoint for the error amplier (VITH1 = 0.6V) and VFB2 to the midpoint for
the error amplier (VITH2 = 0.6V).
Note 4: Total supply current is higher due to the internal gate charge being
delivered at the switching frequency.
Note 5: Variable frequency operation with resistor is guaranteed by design
and is subject to duty cycle limitations.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specied maximum operating junction
temperature may impair device reliability.
Note 7: TJ is calculated from the ambient temperature, TA, and power
dissipation, PD, according to the following formula:
TJ = TA + (PD 34°C/W)
Note 8: Minimum current limit is guaranteed by design and correlation to
the RDS(ON)1D, ILIM1 and ILIM2 measurements.
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