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| 型号： | LTC3546EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A/2A 28QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz，750kHz ~ 4MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-QFN（4x5） |
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LTC3546
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T A = 25°C. V IN = V CCA = 3.6V, unless otherwise specified. (Note 2)
SYMBOL
I SW1D(LKG)
I SW2A/B(LKG)
V UVLO
T PGOOD1
T PGOOD2
R PGOOD1
R PGOOD2
t SS
PARAMETER
Switch Leakage Current SW1D
Switch Leakage Current SW2A/B
Undervoltage Lockout Threshold
Threshold for Power Good
Percentage Deviation from Regulated V FB1
(Typically 0.6V).
Threshold for Power Good
Percentage Deviation from Regulated V FB2
(Typically 0.6V).
Power Good Pull-Down On-Resistance
Power Good Pull-Down On-Resistance
Soft-Start Internal Time.
CONDITIONS
V IN = 6V
V ITH1 = V ITH2 = 0V
V RUN1 = V RUN2 = 0V
V IN = 6V
V ITH2 = 0V
V RUN2 = 0V
V IN1 , V IN2 , V CCA , V CCD Rising
V IN1 , V IN2 , V CCA , V CCD Falling
V FB1 Ramping Up, V SYNC/MODE = 0V
V FB2 Ramping Up, V SYNC/MODE = 0V
V FB from 0% to 95%, V TRACK/SS Is Floating
MIN
2.03
1.86
0.8
TYP
0.01
0.01
2.14
1.97
–8
–8
132
132
1.2
MAX
1
1
2.2
2.03
300
300
1.9
UNITS
μA
μA
V
V
%
%
Ω
Ω
ms
V RUN1 , V RUN2 , RUN1, RUN2, and PHASE Threshold
V PHASE
0.3
0.8
1.2
V
I RUN1 , I RUN2 ,
I PHASE
RUN1, RUN2, and PHASE Leakage Current V IN = 6V, V PHASE = 3V, V RUN1 = V RUN2 = 3V
±0.01
±1
μA
VTL SYNC/MODE SYNC/MODE Threshold Voltage Low to Put
the Part into Pulse-Skipping Mode
VTH SYNC/MODE SYNC/MODE Threshold Voltage High to
Put the Part into Burst Mode Operation
V IN – 0.5
0.5
V
V
V SYNC/MODE
I SYNC/MODE
VTH FREQ
I BMC1 , I BMC2
SYNC/MODE Threshold for Clock
Synchronization
SYNC/MODE Leakage Current
FREQ Threshold Voltage High
BMC1, BMC2 Leakage Current
V IN = 6V, V SYNC/MODE = 3V
V IN = 6V, V BMC = 3V
0.3
V IN – 0.85
0.8
±0.01
1.2
±1
±0.4
V
μA
V
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 LTC3546 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3546E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications 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 specifications over the full –40°C to 125°C operating
junction temperature range. The maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3: The LTC3546 is tested in feedback loop which servos V FB1 to the
midpoint for the error amplifier (V ITH1 = 0.6V) and V FB2 to the midpoint for
the error amplifier (V ITH2 = 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 specified maximum operating junction
temperature may impair device reliability.
Note 7: T J is calculated from the ambient temperature, T A , and power
dissipation, P D , according to the following formula:
T J = T A + (P D ? 34°C/W)
Note 8: Minimum current limit is guaranteed by design and correlation to
the R DS(ON)1D , I LIM1 and I LIM2 measurements.
4
For more information www.linear.com/3546
3546fc
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