參數(shù)資料
型號(hào)： TPS6205
廠商： Texas Instruments, Inc.
英文描述： 800-mA SYNCHRONOUS STEP-DOWN CONVERTER
中文描述： 800毫安同步降壓轉(zhuǎn)換器
文件頁(yè)數(shù)： 12/21頁(yè)
文件大小： 432K
代理商： TPS6205
www.ti.com
V
I
(min)
V
O
(max)
I
O
(max)
r
DS(on)
(max)
R
L
I
O
(max) = Maximum output current plus inductor ripple current
r
DS(on)
(max) = Maximum P-Channel switch r
DS(on)
R
L
= DC resistance of the inductor
V
O
(max) = Nominal output voltage plus maximum output voltage tolerance
5 V
EN
VIN
VIN
V
t
= 0.7 V
0
μ
A for V
EN
< 0.6 V
Typically 0.3
μ
A to 5
μ
Afor V
EN
< 4 V
Enable to Internal Circuitry
EN
VIN
ON
OFF
0.3
μ
A, min
R >1.3 V/0.3
μ
A
TPS6205x
TPS62050, TPS62051
TPS62052, TPS62054, TPS62056
SLVS432D–SEPTEMBER 2002–REVISED OCTOBER 2003
APPLICATION INFORMATION (continued)
Enable and Overtemperature Protection
Logic low on EN forces the TPS6205x into shutdown. In shutdown, the power switch, drivers, voltage reference,
oscillator, and all other functions are turned off. The supply current is reduced to less than 2 μA in the shutdown
mode. When the device is in thermal shutdown, the bandgap is forced to stay on even if the device is set into
shutdown by pulling EN to GND. As soon as the temperature drops below the threshold, the device automatically
starts again.
If an output voltage is present when the device is disabled, which could be an external voltage source or super
cap, the reverse leakage current is specified under electrical characteristics. Pulling the enable pin high starts up
the TPS6205x with the soft-start as described under the paragraph soft-start. If the EN pin is connected to any
voltage other than V
I
or GND, an increased leakage current of typically 10 μA and up to 20 μA can occur.
Figure 17. Internal Circuit of the ENABLE Pin
The EN pin can be used in a pushbutton configuration as shown in Figure 18. The external resistor to GND must
be capable of sinking 0.3 μA with a minimum voltage drop of 1.3 V to keep the system enabled when both
switches are open. When the ON-button is pressed, the device is enabled and the current through the external
resistor keeps the voltage level high to ensure that the device stays on when the ON-button is released. When
the OFF-button is pressed, the device is switched off and the current through the external resistor is zero. The
device therefore stays off even when the OFF-button is released.
Figure 18. Pushbutton Configuration for the EN-Pin
12
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