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参数资料
| 型号： | LTC3606BIDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 8DFN |
| 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 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3606B
OPERATION
Short-Circuit Protection
When either regulator output is shorted to ground, the
corresponding internal N-channel switch is forced on for
a longer time period for each cycle in order to allow the
inductor to discharge, thus preventing inductor current
runaway. This technique has the effect of decreasing
switching frequency. Once the short is removed, normal
operation resumes and the regulator output will return to
its nominal voltage.
Input Current Limit
Internal current sense circuitry measures the inductor
current through the voltage drop across the power PFET
Programming Input Current Limit
Selection of one external R LIM resistor will program the input
current limit. The current limit can be programmed from
200mA up to I PEAK current. As the input current increases,
R LIM voltage will follow. When R LIM reaches the internal
comparator threshold of 1V, the power PFET on-time will
be shortened, thereby, limiting the input current.
Use the following equation to select the R LIM resistance
that corresponds to the input current limit.
R LIM = 55k / I DC
I DC is the input current (at V IN ) to be limited. The following are
some R LIM values with the corresponding current limit.
switch and forces the same voltage across the small sense
PFET. The voltage across the small sense PFET generates
a current representing 1/55,000th of the inductor current
during the on-cycle. The current out of RLIM pin is the
representation of the inductor current, which can be
R LIM
91.6k
110k
137.5k
I DC
600mA
500mA
400mA
expressed in the following equation.
I RLIM = I OUT ? D1 ? K1
where D1 = V OUT1 /V IN is the duty cycle.
K1 is the ratio R DS(ON) (power PFET)/R DS(ON) (sense PFET).
The ratio of the power PFET to the sense PFET is trimmed
to within 2%.
Given that both PFETs are carefully laid out and matched,
their temperature and voltage coef?cient effects will be
similar and their terms be canceled out in the equation. In
that case, the constant K1 will only be dependent on area
scaling, which is trimmed to within 2%. Thus, the I RLIM
current will track the input current very well over varying
temperature and V IN .
The RLIM pin can be grounded to disable input current
limit function.
Selection of C LIM Capacitance
Since I RLIM current is a function of the inductor current,
its dependency on the duty cycle cannot be ignored. Thus,
a C LIM capacitor is needed to integrate the I RLIM current
and smooth out transient currents. The LTC3606B is stable
with any size capacitance >100pF at the RLIM pin.
Each application input current limit will call for different
C LIM value to optimize its response time. Using a large C LIM
capacitor requires longer time for the RLIM pin voltage to
charge. For example, consider the application 500mA input
current limit, 5V input and 1A, 2.5V output with a 50% duty
cycle. When an instantaneous 1A output pulse is applied,
the current out of the RLIM pin becomes 1A/55k = 18.2μA
during the 50% on-time or 9.1μA full duty cycle. With a
C LIM capacitor of 1μF, R LIM of 116k, and using I = CdV/dt,
it will take 110ms for C LIM to charge from 0V to 1V. This is
the time after which the LTC3606B will start input current
limiting. Any current within this time must be considered
in each application to determine if it is tolerable.
3606bfb
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