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| 型号： | MB39A136PFT-G-JN-ERE1 |
| 厂商： | Fujitsu Semiconductor America Inc |
| 文件页数： | 2/4页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24TSSOP |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 占空比： | 80% |
| 电源电压： | 4.5 V ~ 25 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： | -30°C ~ 85°C |
| 封装/外壳： | 24-TFSOP（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | 865-1154-6 |
N ew Products
MB39A135 ( 1-channel )
MB39A136 ( 2-channel )
●
Output voltage setting range: 0.7V to (maximum ON duty
80 ％ )
Figure 1 Conversion Efficiency of MB39A135/136
●
●
●
●
●
Substantial protective functions (overcurrent protection,
overvoltage protection, undervoltage protection, overtemperature
protection)
Requires no flyback diode
Built-in load-independent soft-start/soft-stop function
Small package: TSSOP-16-pin (MB39A135 1 channel)
TSSOP-24-pin (MB39A136 2 channels)
Conforms to the lead-free/RoHS directive
100
90
80
70
60
Condition: VIN=12V VO=1.2V, 1.8V, 3.3V, fosc=300kHz
1.2V
1.8V
3.3V
Fig.1 presents the conversion efficiency of MB39A135/136
and Fig.2 the excess response.
50
0.0
1.0
2.0 3.0
4.0
5.0
Load current IO（A）
Description of Functions
s Main control type
This product adopts current mode Nch/Nch synchronous
rectification. The current mode conducts on duty control by
detecting the coil current (IL) and output voltage (VO).
s PFM function
This product has a built-in PFM function with a unique
method. Using the MODE terminal, the user can select between
PWM mode and automatic PFM/PWM switching mode. In
automatic PFM/PWM switching mode, the product will
operate on PFM mode when the load is light and automatically
switch to PWM mode when the load increases. This function
enables high efficiency operation for the entire load range.
Figure 2 Transient Load Response by MB39A135/136
Condition：VIN=12V，VO=1.2V，fosc=300kHz，IO=OA? 5A
L=1.5μH，CO=66μF
IO ：2.0A/div
VO：200mV/div（ AC ）
500 μs/div
s Load-independent
soft-start/soft-stop function
Figure 3 Soft-start/Soft-stop Function Examples of MB39A136
The soft-start function prevents the
inrush current and overshooting of
output voltage. This function also
allows the setting of output voltage
startup timing. For shutdown with
CTL OFF, undervoltage protection,
or overtemperature protection, the
soft-stop function stops the output
independently from the load.
Fig.3 presents soft-start/soft-stop
function examples of MB39A136.
s Clock generation block
CTL1
CTL2
CTL1 ON
Output started for Channel 1 by soft-start
CTL2 ON
Output started for Channel 2 by soft-start
Channel 2＝3.3V
Channel 1＝1.2V
CTL2 OFF
Output stopping begun for Channel 2 by soft-stop
CTL1 OFF
Output stopping begun for Channel 1 by soft-stop
The oscillation frequency can be set
up at 100kHz to 1MHz by connecting a
resistor at the RT terminal. MB39A136
Capable of addressing load-independent startup/shutdown sequence
(Channel 2 startup/shutdown control during Channel 1 startup)
2007
No.5
FIND Vol.25
2
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