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参数资料
| 型号： | LTC3536IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 12MSOP |
| 标准包装： | 37 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 5.5 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电压模式，混合 |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 1A |
| 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： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-MSOP，裸露焊盘 |
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LTC3536
APPLICATIONS INFORMATION
V IN
V C
PWM
A
B
L
R S
D
C
C OUT
R C
V OUT
R LOAD
The denominator of the buck mode transfer function
exhibits a pair of resonant poles generated by the LC OUT
filtering of the power stage. The resonant frequency of
the power stage, f O , is given by the following expression
where L is the value of the inductor in henries.
3536 F04
Figure 4. Small-Signal Model
ω O =
1
LC OUT
, f O =
1
2 π LC OUT
( s )
V OUT 1 + sR C C OUT
= 2.64 ? V IN ? 2
+ ?
? ω O ? ?
LC OUT
Q =
C OUT ( R C + R S ) +
( 1 + sR C C OUT ) ? ? 1– ω s
( s )
V OUT Z ?
= 2.64 ? G
V C
Boost Mode
? s ?
s
+ ?
ω O Q ? ω O ? ?
variety of output voltages, switching frequencies, and
external component values supported by the LTC3536.
V IN is the input supply voltage, V OUT the programmed
output voltage, L is the external buck-boost inductor, C OUT
the output capacitor, R S the series resistance in the power
path (it can be approximated as twice the average power
switch resistance plus the DC resistance of the inductor)
and R C is the output capacitor ESR.
Buck Mode
The small-signal transfer function of the buck-boost
converter is different in the buck and boost modes of op-
eration and care must be taken to ensure stability in both
operating regions. When stepping down from a higher
input voltage to a lower output voltage, the converter
will operate in buck mode and the small-signal transfer
function from the error amplifier output, V C , to the con-
verter output voltage is given by the following equation:
V C Buck Mode s ? s ?
1 +
ω O Q
This transfer function has a single zero created by the
output capacitor ESR and a resonant pair of poles. In most
applications, an output capacitor with a very low ESR is
utilized in order to reduce the output voltage ripple to ac-
ceptable levels. Such low values of capacitor ESR result
in a very high frequency zero and as a result the zero is
commonly too high in frequency to significantly impact
compensation of the feedback loop.
The quality factor, Q, has a significant impact on compensa-
tion of the voltage loop since a higher Q factor produces
a sharper loss of phase near the resonant frequency. The
quality factor is inversely related to the amount of damping
in the power stage and is substantially influenced by the
average series resistance of the power stage, R S . Lower
values of R S will increase the Q and result in a sharper
loss of phase near the resonant frequency and will require
more phase boost or lower bandwidth to maintain an
adequate phase margin.
L
R LOAD
Boost Mode
When stepping up from a lower input voltage to a higher
output voltage, the buck-boost converter will operate in
boost mode where the small-signal transfer function from
control voltage, V C , to the output voltage is given by the
following expression:
? ?
2
1 +
In boost mode operation, the transfer function is character-
ized by a pair of resonant poles and a zero generated by
the ESR of the output capacitor as in buck mode. However,
in addition there is a right-half plane zero which generates
3536fa
15
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| LTC3537 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD#PBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3537EUD#TRPBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3537EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
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