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参数资料
| 型号： | G528AP1U |
| 厂商： | Global Mixed-mode Technology Inc. |
| 英文描述： | USB High-Side Power Switch Advance Information |
| 中文描述： | 的USB高侧电源开关进展信息 |
| 文件页数： | 6/8页 |
| 文件大小： | 194K |
| 代理商： | G528AP1U |
Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G528/G528A
Global Mixed-mode Technology Inc.
Functional Description
The G528/G528A is high-side 1-channel switch with
active-low enable input. Fault conditions turn off or
inhibit turn-on of the output transistors.
Input and Output
IN (input) is the power supply connection to the logic
circuitry and the source of the output MOSFET. OUT
(output) is the drain of the output MOSFET. In a typical
application, current flows through the switch from IN to
OUT toward the load. All OUT pins must be connected
together to the load.
The output MOSFET and driving circuit are also de-
signed to allow the MOSFET drain to be externally
forced to a higher voltage than the source (VOUT > VIN)
when
the
switch
is
off.
In
this
situation,
the
G528/G528A avoids undesirable drain-to-body diode
current flow by connecting the body to the most posi-
tive voltage. If VOUT >VIN when switch is enabled, cur-
rent will flow from VOUT to VIN.
Thermal Shutdown
Thermal shutdown protects G528/G528A from exces-
sive power dissipation. If the die temperature exceeds
135°C, the MOSFETS switch is shut off. 10°C of hys-
tersis prevents the switch from turning on until the die
temperature drops to 125°C. Thermal shutdown circuit
functions only when the switch is enabled.
Undervoltage Lockout
UVLO (undervoltage lockout) prevents the output
MOSFET from turning on until IN (input voltage) ex-
ceeds 2.5V typically. After the switch turns on, if the
voltage drops below 2.3V typically, UVLO shuts off the
output MOSFET. UVLO detection functions only when
the switch is enabled.
Current Sensing and Limiting
The current limit threshold is preset internally. The
preset level prevents damage to the output MOSFET
and external load but allows a minimum current of
0.5A through the output MOSFET.
A current sense circuit senses the output current of
MOSFET switch. If output current exceeds the current
limit threshold, the output MOSFET switch is shut off.
The reaction to an overcurrent is measured with the
following scenarios:
Switch Enabled into Heavy Load
If the switch is powered on or enabled into a heavy
load or short-circuit, the switch immediately goes into
a constant-current mode, reducing the output voltage.
See the "Enable into Short Circuit" graph.
Heavy Load Applied to Enabled Switch
When a heavy load is applied, a large current may
flow from the switch. The current limit circuit may shut
the switch off briefly, then fold back into con-
stant-current mode. See the “Short Applied to Output”
graph and the "Ramped Load to Enable Device"
graph.
Fault Flag
FLG is a 2-channel, open-drain MOSFET output.
Thefault-flag is active (low) for one or more of the fol-
lowing conditions: current limiting, undervoltage, or
thermal shutdown. The flag output MOSFET is capa-
ble of sinking a 10mA load to typically 100mV above
ground.
Applications Information
Supply filtering
A 0.1F to 1F bypass capacitor from IN to GND as
shown in Figure 1, located near the G528/G528A, is
strongly recommended to control supply transients.
Without a bypass capacitor, an output short may
cause sufficient ringing on the input (from supply lead
inductance) to damage internal control circuitry.
Input transients must not exceed the absolute maxi-
mum supply voltage (VIN max = 6V) even for a short du-
ration.
Figure 1. Supply Bypassing
EN
GND
OUT
IN
G528
3.0V to 5.5V
0.1 F to 1 F
off
on
EN
GND
OUT
IN
G528
3.0V to 5.5V
0.1 F to 1 F
off
on
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相关代理商/技术参数 |
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| G528AP1UF | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:USB High-Side Power Switch Advance Information |
| G528P1U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:USB High-Side Power Switch Advance Information |
| G528P1UF | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:USB High-Side Power Switch Advance Information |
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