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부품번호 | AAT4608 기능 |
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기능 | Current Limited Load Switch | ||
제조업체 | Skyworks | ||
로고 | |||
전체 9 페이지수
DATA SHEET
AAT4608
Current Limited Load Switch in a SOT23 Package
General Description
The AAT4608 SmartSwitch is a member of Skyworks'
Application Specific Power MOSFET™ (ASPM™) product
family. It is a current limited P-channel MOSFET power
switch designed for high-side load switching applica-
tions. This switch operates with inputs ranging from 2.7V
to 5.5V, making it ideal for both 3V and 5V systems. An
integrated current-limiting circuit protects the input sup-
ply against large currents which may cause the supply to
fall out of regulation. The AAT4608 is also protected
from thermal overload which limits power dissipation
and junction temperatures. It can be used to control
loads that require up to 1A. Current limit threshold is
programmed with a resistor from SET to ground. The
quiescent supply current is typically a low 15μA max.
The AAT4608 is available in a Pb-free, 5-pin SOT23 pack-
age, and is specified over the -40°C to +85°C tempera-
ture range.
Features
• 2.7V to 5.5V Input Voltage Range
• Programmable Over-Current Threshold
• Fast Transient Response:
▪ <1μs Response to Short Circuit
• Low Quiescent Current
▪ 15μA Typical
▪ 1μA Max With Switch Off
• 160m Typical RDS(ON)
• Under-Voltage Lockout
• Thermal Shutdown
• Temperature Range: -40°C to +85°C
• 4kV ESD Rating
• 5-Pin SOT23 Package
Applications
• Hot Swap Supplies
• Notebook Computers
• Peripheral Ports
• Personal Communication Devices
Typical Application
INPUT
1μF
GND
5
IN
AAT4608 OUT 1
SOT23
3
SET
GND
2
RSET
OUTPUT
0.47μF
GND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012
1
DATA SHEET
AAT4608
Current Limited Load Switch in a SOT23 Package
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
VIN
IQ
VUVLO
Description
Operation Voltage
Quiescent Current
Under-Voltage Lockout
RDS(ON)
On Resistance
ILIM
ILIM(MIN)
TRESP
Current Limit
Minimum Current Limit
Current Limit Response Time
Conditions
VIN = 5V, IOUT = 0
Rising Edge, 1% Hysteresis
VIN = 5.0V
VIN = 4.5V
VIN = 3.0V
RSET = 6.8k
VIN = 5V
Min
2.7
2.0
0.5
Typ
15
2.3
160
165
195
1
150
0.8
Max
5.5
30
2.7
180
230
2.0
Units
V
μA
V
m
A
mA
μs
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
4 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012
4페이지 Functional Block Diagram
IN
Under-
voltage
Lockout
DATA SHEET
AAT4608
Current Limited Load Switch in a SOT23 Package
Over-Temp
Protection
OUT
1.2V
Reference
Current
Limit
GND
SET
RSET
Applications Information
Setting Current Limit
In most applications, the variation in ILIM must be taken
into account when determining RSET. The ILIM variation is
due to processing variations from part to part, as well as
variations in the voltages at IN (Pin 5) and OUT (Pin 1),
plus the operating temperature. See charts “Current
Limit vs. Temperature,” and “Output Current vs. VOUT.”
Together these three factors add up to a ±25% tolerance
(see ILIM specification in Electrical Characteristics sec-
tion). In the figure below, a cold device with a statisti-
cally higher current limit, and a hot device with a statis-
tically lower current limit, both with RSET equal to 10.5k,
are shown. While the chart, "RSET vs. ILIM” indicates an ILIM
of 0.7A with an RSET of 10.5k, this figure shows that the
actual current limit will be at least 0.525A, and no great-
er than 0.880A.
Current Limit Using 10.5kΩ
1.2
1 0.88 A
Device with high current limit at -40°C
0.8
0.6
0.4 0.525 A
0.2
Device with low current limit at 85°C
0
0 12 3 4 5
VOUT (V)
To determine RSET, start with the maximum current drawn
by the load and multiply it by 1.33. (Typical_ILIM =
minimum_ILIM / 0.75.) This is the typical current limit
value. Next, refer to “RSET vs. ILIM” and find the RSET that
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012
7
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |