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參數(shù)資料
| 型號： | RT9702A |
| 英文描述： | Power Management/Switchers |
| 中文描述： | 電源管理/切換器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 240K |
| 代理商： | RT9702A |
Preliminary
RT9702/A
DS9702A-01 March 2003
www.richtek.com
11
Applications Information
The RT9702 and RT9702A are single N-Channel
MOSFET high-side power switches with active-high
enable
input,
optimized
bus-powered Universal Serial Bus (USB) applications.
The RT9702/A equipped with a charge pump circuitry to
drive the internal NMOS switch; the switch’s low
R
DS(ON)
, 80m
, meets USB voltage drop requirements;
and a flag output is available to indicate fault conditions
to the local USB controller.
for
self-powered
and
Input and Output
V
IN
(input) is the power source connection to the
internal circuitry and the drain of the MOSFET. V
OUT
(output) is the source of the MOSFET. In a typical
application, current flows through the switch from V
IN
to
V
OUT
toward the load. If V
OUT
is greater than V
IN
,
current will flow from V
OUT
to V
IN
since the MOSFET is
bidirectional when on.
Unlike a normal MOSFET, there is no a parasitic body
diode between drain and source of the MOSFET, the
RT9702/A prevents reverse current flow if V
OUT
being
externally forced to a higher voltage than V
IN
when the
output disabled (V
CE
<
0.8V).
D
Chip Enable Input
The switch will be disabled when the CE pin is in a logic
low condition. During this condition, the internal circuitry
and MOSFET are turned off, reducing the supply
current to 0.1
μ
A Typical. The maximum guaranteed
voltage for a logic low at the CE pin is 0.8V. A minimum
guaranteed voltage of 2V at the CE pin will turn the
RT9702/A back on. Floating the input may cause
unpredictable operation. CE should not be allowed to
go negative with respect to GND. The CE pin may be
directly tied to V
IN
to keep the part on.
Soft-Start for Hot Plug-In Applications
In order to eliminate the upstream voltage droop
caused by the large inrush current during hot-plug
events, the “soft-start” feature effectively isolates the
power source from extremely large capacitive loads,
satisfying the USB voltage droop requirements.
Fault Flag
The RT9702/A provides a FLG signal pin which is an
N-Channel open drain MOSFET output. This open
drain output goes low when V
OUT
< V
IN
– 1V, current
limit
or
the
die
temperature
approximately. The FLG output is capable of sinking a
10mA load to typically 200mV above ground. The FLG
pin requires a pull-up resistor, this resistor should be
large in value to reduce energy drain. A 100k
pull-up
resistor works well for most applications. In the case of
an over-current condition, FLG will be asserted only
after the flag response delay time, t
D
, has elapsed. This
ensures that FLG is asserted only upon valid
over-current conditions and that erroneous error
reporting is eliminated.
exceeds
130
°
C
For example, false over-current conditions may occur
during hot-plug events when extremely large capacitive
loads are connected and causes a high transient inrush
current that exceeds the current limit threshold. The
FLG response delay time t
D
is typically 10mS.
Under-Voltage Lockout
Under-voltage lockout (UVLO) prevents the MOSFET
switch from turning on until input voltage exceeds
approximately 1.7V. If input voltage drops below
approximately 1.3V, UVLO turns off the MOSFET
switch, FLG will be asserted accordingly. Under-voltage
detection functions only when the switch is enabled.
Current Limiting and Short-Circuit Protection
The current limit circuitry prevents damage to the
MOSFET switch and the hub downstream port but can
deliver load current up to the current limit threshold of
typically 800mA through the switch of RT9702 and
S
G
Normal MOSFET
RT9702/A
D
S
G
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