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参数资料
| 型号： | LTC3809EMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 825kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3809
APPLICATIONS INFORMATION
can be lowered and distributed to other frequencies and
their harmonics by modulating the PWM frequency. The
LTC3809’s switching noise (at 550kHz) is spread between
460kHz and 635kHz in spread spectrum modulation opera-
tion. Figure 8 shows the spectral plots of the output (V OUT )
noise with/without spread spectrum modulation. Note the
signi?cant reduction in peak output noise (>20dBm).
The spread spectrum modulation operation of the LTC3809
Table 2 summarizes the different states in which the
SYNC/MODE Pin can be used.
Table 2. The States of the SYNC/MODE Pin
SYNC/MODE PIN CONDITION
GND (0V to 0.35V) Forced Continuous Mode
Current Reversal Allowed
V FB (0.45V to 1.2V) Pulse-Skipping Mode
No Current Reversal Allowed
is enabled by setting SYNC/MODE pin to a DC voltage
between 1.35V and several hundred mV below V IN by
tying a resistor between SYNC/MODE and V IN .
V OUT Spectrum without Spread Spectrum Modulation
Resistor to V IN
(1.35V to V IN – 0.5V)
V IN
Feedback Resistors
External Clock Signal
Spread Spectrum Modulation
Pulse Skipping at Light Loads
No Current Reversal Allowed
Burst Mode Operation
No Current Reversal Allowed
Regulate an Auxiliary Winding
Enable Phase-Locked Loop
(Synchronize to External Clock)
Pulse Skipping at Light Load
No Current Reversal Allowed
NOISE (dBm)
–10dBm/DIV
Fault Condition: Short-Circuit and Current Limit
If the LTC3809’s load current exceeds the short-circuit
current limit (I SC ), which is set by the short-circuit sense
threshold ( Δ V SC ) and the on resistance (R DS(ON) ) of
bottom N-channel MOSFET, the top P-channel MOSFET
START FREQ: 400kHz
RBW: 100Hz
STOP FREQ: 700kHz
3809 F08a
is turned off and will not be turned on at the next clock
cycle unless the load current decreases below I SC . In this
case, the controller’s switching frequency is decreased
V OUT Spectrum with Spread Spectrum Modulation
(C SSM = 2200pF)
NOISE (dBm)
and the output is regulated by short-circuit (current limit)
protection.
In a hard short (V OUT = 0V), the top P-channel MOSFET
is turned off and kept off until the short-circuit condition
is cleared. In this case, there is no current path from
input supply (V IN ) to either V OUT or GND, which prevents
excessive MOSFET and inductor heating.
–10dBm/DIV
Low Input Supply Voltage
Although the LTC3809 can function down to below 2.4V,
the maximum allowable output current is reduced as V IN
START FREQ: 400kHz
RBW: 100Hz
STOP FREQ: 700kHz
3809 F08b
decreases below 3V. Figure 9 shows the amount of change
as the supply is reduced down to 2.4V. Also shown is the
effect on V REF .
Figure 8. Spectral Response of Spread Spectrum Modulation
3809fc
18
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