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| 型号： | LTC3852IUDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DOUBLER PWM 24-QFN |
| 标准包装： | 73 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 810kHz |
| 占空比： | 99% |
| 电源电压： | 2.7 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 是 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3852
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C (Note 2), V IN1 = 3.3V, V IN2 = 15V, V RUN = 3.3V, SHDN = 0V,
MODE/PLLIN = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator and Phase-Locked Loop (Step-Down Regulator)
f NOM1
f LOW1
f HIGH1
f NOM2
f LOW2
f HIGH2
f MODE
Nominal Frequency
Lowest Frequency
Highest Frequency
Nominal Frequency
Lowest Frequency
Highest Frequency
MODE/PLLIN Minimum Input Frequency
R FREQ = 60k
R FREQ = 160k
R FREQ = 36k
R FREQ = 60k (Note 7)
R FREQ = 160k (Note 7)
R FREQ = 36k (Note 7)
MODE/PLLIN = External Clock
460
205
690
460
205
690
500
235
750
500
235
750
250
540
265
810
540
265
810
kHz
kHz
kHz
kHz
kHz
kHz
kHz
MODE/PLLIN Maximum Input Frequency
750
kHz
R MODE/PLLIN
I FREQ
MODE/PLLIN Input Resistance
Phase Detector Output Current
100
kΩ
Sinking Capability
Sourcing Capability
f MODE > f OSC
f MODE < f OSC
–90
75
μA
μA
PGOOD Output
V PGL
I PGOOD
PGOOD Voltage Low
PGOOD Leakage Current
I PGOOD = 2mA
V PGOOD = 5V
0.1
0.3
±1
V
μA
V PG
PGOOD Trip Level
V FB with Respect to Regulated Voltage
V FB Ramping Negative
V FB Ramping Positive
–12
8
–10
10
–8
12
%
%
V PUMP Charge Pump Supply (V IN1 = 3.3V; V SHDN = 3.3V, V RUN = 0); C VIN1 = 4.7μF, C FLY = 2.2μF, C VPUMP = 4.7μ F
V IN1
Input Voltage Range
2.7
5.5
V
V PUMP
Charge Pump Doubler Output Voltage C FLY = 2.2μF
2.7V < V IN1 < 5.5V; I VPUMP = 1mA
l
4.8
5.05
5.3
V
I SHDN
V RIPPLE
Shutdown Pin Current
Output Ripple at V PUMP
SHDN = 0V; V PUMP = 0V
I VPUMP = 50mA (Note 10)
20
1
μA
mV P-P
f PUMP
Charge Pump Frequency
0.6
1.2
1.8
MHz
V IH
V IL
SHDN Input Threshold
SHDN Input Threshold
l
l
1.3
0.4
V
V
I IH
I IL
R OL
SHDN Input Current
SHDN Input Current
Effective Open-Loop Output Resistance
V IN1 = 2.7V, V PUMP = 4.5V
–1
–1
6
1
1
μA
μA
Ω
(Note 8)
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 LTC3852 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3852E is guaranteed to meet speci?cations from
0°C to 85°C junction temperature. Speci?cations over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3852I is guaranteed over the –40°C to 125°C operating junction
temperature range. T J is calculated from the ambient temperature, T A and
power dissipation P D according to the following formula:
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels. Rise and fall times are assured by
design, characterization and correlation with statistical process controls.
Note 6: The minimum on-time condition is speci?ed for an inductor
peak-to-peak ripple current equal to 40% of I MAX (see Minimum On-Time
Considerations in the Applications Information Section).
Note 7: V IN1 = 3.3V; Connect V PUMP , V IN2 and INTV CC together.
Note 8: R OL = (2V IN - V OUT )/I OUT
Note 9: V IN2 swept while not connected to V PUMP or INTV CC.
Note 10: Guaranteed by design, not tested in production.
T J = T A + (P D ? 38°C/W)
Note 3: The LTC3852 is tested in a feedback loop that servos V ITH to a
speci?ed voltage and measures the resultant V FB .
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications information.
3852f
4
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