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| 型号： | LTC3448EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.2 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz ~ 2.25MHz |
| 电流 - 输出： | 600mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3448
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T A = 25 ° C. V IN = 3.6V unless otherwise specified.
SYMBOL
I S
PARAMETER
Input DC Bias Current
Active Mode (Pulse Skip, No LRO)
Linear Regulator Operation (LRO)
Shutdown
CONDITIONS
V IN = 3.6V (Note 5)
V FB = 0.5V or V OUT = 90%, I LOAD = 0A, 1.5MHz
V FB = 0.5V or V OUT = 90%, I LOAD = 0A, 2.25MHz
I LOAD ≤ I LDO(ON)
V RUN = 0V, V IN = 5.5V
MIN
TYP
250
275
32
0.1
MAX
375
400
43
1
UNITS
μ A
μ A
μ A
μ A
f OSC
f SYNC
Oscillator Frequency
Synchronization Frequency
FREQ = Low, V IN = 3.6V
FREQ = High
(Note 6)
●
●
1.2
1.8
1.5
1.5
2.25
1.8
2.7
>4
MHz
MHz
MHz
V TH(SYNC)
SYNC Activation Input Threshold
1
1.3
V
R PFET
R NFET
R DS(ON) of P-Channel FET
R DS(ON) of N-Channel FET
I SW = 100mA
I SW = –150mA
0.4
0.35
?
?
I LSW
SW Leakage
V RUN = 0V, V SW = 0V or 5V, V IN = 5V
± 0.01
± 1
μ A
V RUNH
V RUNL
RUN Threshold High
RUN Threshold Low
●
●
1.5
0.3
V
V
I RUN
RUN Leakage Current
●
± 0.01
± 1
μ A
V FREQH
V FREQL
FREQ Threshold High
FREQ Threshold Low
●
●
V IN – 1
1
V
V
I FREQ
FREQ Leakage Current
●
± 0.01
± 1
μ A
V MODEH
V MODEL
MODE Threshold High
MODE Threshold Low
●
●
V IN – 0.15
0.12
V
V
I MODE
I SYNC
I LDO(ON)
I LDO(OFF)
MODE Leakage Current
SYNC Leakage Current
LRO ON Load Current Threshold
LRO OFF Load Current Threhold
2.2mH Inductor (Note 8)
●
●
8
± 0.1
± 0.01
3
11
± 1
± 1
5
17
μ A
μ A
mA
mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3448E is guaranteed to meet performance 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: 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 )(43 ° C/W)
Note 4: The LTC3448 is tested in a proprietary test mode that connects
V FB to the output of the error amplifier.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. LRO is “linear regulator operation.”
Note 6: 4MHz operation is guaranteed by design but is not production
tested and is subject to duty cycle limitations.
Note 7: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125 ° C when overtemperature is active. Continu-
ous operation above the specified maximum operating junction tempera-
ture may impair device reliability.
Note 8: The load current below which the switching regulator turns off and
the LDO turns on is, to first order, inversely proportional to the value of
the inductor. This effect is covered in more detail in the Operation section.
This parameter is not production tested but is guaranteed by design.
Note 9: For 2.5V < V IN < 2.7V the output voltage is limited to V IN – 0.7V
to ensure regulation in linear regulator mode. This parameter is not
production tested but is guaranteed by design.
3448f
3
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