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参数资料
| 型号： | LTC3448EMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8MSOP |
| 标准包装： | 2,500 |
| 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-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LTC3448
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
External Mode Control (Constant
Load Step
1mA Load)
V OUT
100mV/DIV
AC COUPLED
V OUT
20mV/DIV
AC COUPLED
SWITCHER
LDO
SWITCHER
I LOAD
250mA/DIV
I L
500mA/DIV
MODE PIN
2V/DIV
V IN = 3.6V
V OUT = 1.5V
10 μ s/DIV
3448 G18
V OUT = 1.5V
T A = 25 ° C
200 μ s/DIV
3448 G19
I LOAD = 100mA TO 600mA
PI FU CTIO S
V FB (Pin 1): Feedback Pin. This pin receives the feedback
voltage from an external resistive divider across the
output.
V OUT (Pin 2): Output Pin. This pin connects to an external
resistor divider and the linear regulator output. Connect
externally to the inductor and the output capacitor. The
internal linear regulator will supply current up to the
I LDO(OFF) current. Load currents above that are supplied by
the buck regulator. Internal circuitry automatically enables
the buck switching regulator at load currents higher than
the I LDO(OFF) . The minimum required capacitance on this
pin is 2 μ F.
MODE (Pin 3): Linear Regulator Control. Grounding this
pin turns off the linear regulator. Setting this pin to V IN
turns on the linear regulator regardless of the load current.
Tying this pin midrange (i.e., to V OUT ) will place the linear
regulator in auto mode, where turn on/off is a function of
the load current. In applications where MODE is externally
driven high or low, this pin should be held low for 50 μ s
after the RUN pin is pulled high.
V IN (Pin 4): Main Supply Pin. This pin must be closely
decoupled to GND with a 2.2 μ F or greater ceramic
capacitor.
SW (Pin 5): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
FREQ (Pin 6): Frequency Select. Switching frequency is
set to 1.5MHz when FREQ = 0V and to 2.25MHz when
FREQ = V IN . Do not float this pin.
SYNC (Pin 7): External Synchronization Pin. The oscilla-
tion frequency can be synchronized to an external oscilla-
tor applied to this pin. For external frequencies above
2.2MHz, pull FREQ high.
RUN (Pin 8): Run Control Input. Forcing this pin above
1.5V enables the part. Forcing this pin below 0.3V shuts
down the device. In shutdown, all functions are disabled
drawing <1 μ A supply current. Do not leave RUN floating.
Exposed Pad (Pin 9): Ground. This pin must be soldered
to PCB.
3448f
6
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