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| 型号： | LTC3448EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20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
FU CTIO AL DIAGRA
FREQ
SYNC
7
MODE
3
6
V OUT
2
V IN
LDO
DRIVE
OSC
SLOPE
COMP
–
LDO CONTROL
LOGIC
4 V IN
+
V FB
0.6V
EA
– +
I COMP
5 ?
1
OSC
S
Q
V IN
R Q
RS LATCH
SWITCHING
LOGIC
RUN
8
0.6V REF
–
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
5 SW
SHUTDOWN
0.6V + ? OVL
OVDET
+
Figure 1
I RCMP
9 GND
3448 F01
OPERATIO
Main Control Loop
(Refer to Functional Diagram)
comparator OVDET guards against transient overshoots
The LTC3448 uses a constant frequency, current mode,
step-down architecture. Both the main (P-channel MOS-
FET) and synchronous (N-channel MOSFET) switches are
internal. During normal operation, the internal top power
MOSFET is turned on each cycle when the oscillator sets
the RS latch, and turned off when the current comparator,
I COMP , resets the RS latch. The peak inductor current at
which I COMP resets the RS latch, is controlled by the
output of error amplifier EA. When the load current
increases, it causes a slight decrease in the feedback
voltage FB INT relative to the 0.6V reference, which in turn,
causes the EA amplifier’s output voltage to increase until
the average inductor current matches the new load cur-
rent. While the top MOSFET is off, the bottom MOSFET is
turned on until either the inductor current starts to re-
verse, as indicated by the current reversal comparator
5.8% by turning off the main switch and keeping it off until
the fault is removed.
Pulse Skipping Mode Operation
At light loads, the inductor current may reach zero or
reverse on each pulse. The bottom MOSFET is turned off
by the current reversal comparator, I RCMP , and the switch
voltage will ring. This is discontinuous mode operation,
and is normal behavior for the switching regulator. At very
light loads, the LTC3448 will automatically skip pulses to
maintain output regulation.
Low Ripple LDO Mode Operation
At load currents below I LDO(ON), and when enabled, the
LTC3448 will switch into very low ripple, linear regulating
operation (LRO). In this mode, the current is sourced from
I RCMP , or the beginning of the next clock cycle. The
3448f
7
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