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参数资料
| 型号： | LTC3633IUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A DL 28QFN |
| 标准包装： | 73 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 14.7 V |
| 输入电压： | 3.6 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-QFN（4x5） |
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LTC3633
APPLICATIONS INFORMATION
MODE/SYNC Operation
The MODE/SYNC pin is a multipurpose pin allowing both
mode selection and operating frequency synchroniza-
tion. Floating this pin or connecting it to INTV CC enables
Burst Mode operation for superior efficiency at low load
currents at the expense of slightly higher output voltage
ripple. When the MODE/SYNC pin is tied to ground, forced
continuous mode operation is selected, creating the lowest
fixed output ripple at the expense of light load efficiency.
The LTC3633 will detect the presence of the external clock
signal on the MODE/SYNC pin and synchronize the inter-
nal oscillator to the phase and frequency of the incoming
clock. The presence of an external clock will place both
regulators into forced continuous mode operation.
Output Voltage Tracking and Soft-Start
The LTC3633 allows the user to control the output voltage
ramp rate by means of the TRACKSS pin. From 0 to 0.6V, the
TRACKSS voltage will override the internal 0.6V reference
input to the error amplifier, thus regulating the feedback
voltage to that of the TRACKSS pin. When TRACKSS is
above 0.6V, tracking is disabled and the feedback voltage
will regulate to the internal reference voltage.
V OUT1
V OUT2
The voltage at the TRACKSS pin may be driven from an
external source, or alternatively, the user may leverage
the internal 1.4μA pull-up current source to implement
a soft-start function by connecting an external capacitor
(C SS ) from the TRACKSS pin to ground. The relationship
between output rise time and TRACKSS capacitance is
given by:
t SS = 430000Ω ? C SS
A default internal soft-start ramp forces a minimum soft-
start time of 400μs by overriding the TRACKSS pin input
during this time period. Hence, capacitance values less
than approximately 1000pF will not significantly affect
soft-start behavior.
When driving the TRACKSS pin from another source, each
channel’s output can be set up to either coincidentally or
ratiometrically track another supply’s output, as shown in
Figure 4. In the following discussions, V OUT1 refers to the
LTC3633 output 1 as a master channel and V OUT2 refers
to output 2 as a slave channel. In practice, either channel
can be used as the master.
To implement the coincident tracking in Figure 4a, con-
nect an additional resistive divider to V OUT1 and connect
its midpoint to the TRACKSS pin of the slave channel.
V OUT1
V OUT2
TIME
3633 F04a
TIME
3633 F04b
(4a) Coincident Tracking
(4b) Ratiometric Tracking
Figure 4. Two Different Modes of Output Voltage Tracking
3633fc
For more information www.linear.com/LTC3633
17
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