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PT6444N

更新时间： 2024-02-08 00:35:12
品牌 Logo 应用领域
德州仪器 - TI 稳压器开关
页数 文件大小 规格书
8页 180K
描述
6A SWITCHING REGULATOR, 400kHz SWITCHING FREQ-MAX, SMA12, ROHS COMPLIANT, SIP-12

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PT6444N 技术参数

是否Rohs认证：符合生命周期：Obsolete
零件包装代码：MODULE包装说明：,
针数：12Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
Factory Lead Time：1 week风险等级：5.72
Is Samacsys：N模拟集成电路 - 其他类型：SWITCHING REGULATOR
最大输入电压：5.5 V最小输入电压：3.1 V
标称输入电压：5 VJESD-30 代码：R-XSMA-T12
功能数量：1端子数量：12
最高工作温度：85 °C最低工作温度：-40 °C
最大输出电流：6 A封装主体材料：UNSPECIFIED
封装形状：RECTANGULAR封装形式：MICROELECTRONIC ASSEMBLY
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
表面贴装：NO切换器配置：BUCK
最大切换频率：400 kHz技术：HYBRID
温度等级：INDUSTRIAL端子形式：THROUGH-HOLE
端子位置：SINGLE处于峰值回流温度下的最长时间：NOT SPECIFIED
Base Number Matches：1

PT6444N 数据手册

 浏览型号PT6444N的Datasheet PDF文件第2页浏览型号PT6444N的Datasheet PDF文件第3页浏览型号PT6444N的Datasheet PDF文件第4页浏览型号PT6444N的Datasheet PDF文件第5页浏览型号PT6444N的Datasheet PDF文件第6页浏览型号PT6444N的Datasheet PDF文件第8页 
Application Notes  
PT6440 Series  
Using the Inhibit Function on the PT6440  
Excalibur 5V/3.3V Bus Step-Down ISRs  
For applications requiring output voltage On/Off control,  
the 12-pin PT6440 series products incorporate an Inhibit  
function. This function may be used wherever there is a  
requirement for the module to be switched off. The  
function is provided by the Inhibit control (pin 1) input.  
Turn-On Time: In the circuit of Figure 1, turning Q1 on  
applies a low-voltage to the Inhibit control (pin 1) and  
disables the regulator output. Correspondingly, turning  
Q1 off allows the Inhibit control pin to be pulled high by  
its internal pull-up resistor. The ISR produces a fully  
regulated output voltage within 10 milliseconds of the  
release of the Inhibit control pin. The actual turn-on  
time will vary with input voltage, output load, and the  
total amount of load capacitance. Figure 2 shows the  
typical rise in both output voltage and input current for a  
PT6441 (3.3V) following the turn-off of Q1 at time t =0.  
The waveform was measured with a 5Vdc input voltage,  
and 6 Adc resistive load.  
1
The ISR functions normally with pin 1 open-circuit,  
providing a regulated output whenever a valid source  
voltage is applied to Vin, (pins 2–4), with respect to GND  
(pins 5–8). When a low-level ground signal is applied  
to pin 1, the regulator output is disabled.  
Figure 1 shows an application schematic, which details  
the typical use of the Inhibit function. Note the discrete  
transistor (Q1). The Inhibit control has its own internal  
pull-up to +Vin potential. An open-collector or open-  
Figure 2  
2
drain device is required to control this pin.  
VO (2V/Div)  
IIN (2A/Div)  
The Inhibit pin control thresholds are given in Table 1.  
Equation 1 may be used to determine the approximate  
current drawn from the input source, and by Q1 when the  
regulator is placed in the inhibit state.  
3
Table 1; Inhibit Control Requirements  
Parameter  
Min  
– 0.5  
Max  
VINH (5V/Div)  
Enable (V  
)
V
V
in  
0.5V  
IH  
Disable (V  
in  
-0.2V  
)
IL  
Transition Time  
4
10µs  
-1  
0
1
2
3
4
5
6
7
8
9
10  
t (milliseconds)  
Equation 1; Off Input Current  
Notes:  
Istby  
= Vin ÷ 10kΩ  
20%  
1. Use an open-collector device (preferably a discrete  
transistor) for the Inhibit input. A pull-up resistor is not  
necessary. To disable the output voltage, the control pin  
should be pulled low to less than +0.5VDC.  
Figure 1  
2. Do not control the Inhibit input with an external DC  
voltage. This will lead to erratic operation of the ISR and  
may over-stress the regulator.  
+5V  
+2.5V  
2,3,4  
Vin  
9, 10, 11  
V o  
PT6442  
3. Avoid capacitance greater than 500pF at the Inhibit  
control pin. Excessive capacitance at this pin will cause the  
ISR to produce a pulse on the output voltage bus at turn-  
on.  
Inhibit*  
1
GND  
V o(adj)  
5 – 8  
1 2  
+
+
C in  
C out  
4. Keep the On/Off transition to less than 10µs. This  
prevents erratic operation of the ISR, which could cause  
the output voltage to be momentarily higher than normal.  
C O M  
C O M  
Q 1  
B S S 1 3 8  
Inhibit  
For technical support and more information, see inside back cover or visit www.ti.com  
1...45678

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