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AAT4674 PDF 데이터시트 ( Data , Function )

부품번호 AAT4674 기능
기능 Power Supply Selector Switch
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AAT4674 데이터시트, 핀배열, 회로
General Description
The AAT4674/4674-1 are members of Analogic-
Tech’s Application Specific Power Management
SmartSwitch™ family. These devices are dual
input single output power supply selector switches
designed to operate from batteries, or any other
power supply with an input voltage up to 6V.
The AAT4674/4674-1 connects the supply voltage
www.DataSheet4U.coonm IN1 to OUT, or IN2 to OUT, through a very low
RDS(ON) power MOSFET that minimizes voltage
drops and power dissipation. The enable (EN) and
select (SEL) pin voltages control the operational
state of the internal power MOSFET switches.
Once enabled, the SEL pin will switch between the
IN1 and IN2 inputs. If both input voltages are below
the UVLO, then the AAT4674 output floats. In the
case of the AAT4674-1, if one of the input voltages
is above the UVLO threshold then that input volt-
age that is above the UVLO threshold is passed
through to the output.
The two power switches are current limited and the
current limit thresholds can be programmed through
the resistors on IIN1 and IIN2 pins respectively.
The AAT4674/4674-1 are available in thermally
enhanced, space-saving Pb-free 12-pin TSOPJW
packages. The AAT4674/4674-1 are specified for
operation over the -40°C to +85°C temperature
range.
AAT4674
Power Supply Selector Switch
Features
SmartSwitch
• Input Voltage Supply Range: 2.5V to 6V
• High Level of Integration:
— Reverse Blocking Diode
— Current Sensing
— Programmable Current Limit
— Single Control Pin Switching
• Break-Before-Make Switch-Over
— Minimum Output Voltage Drop During
Change-Over
• Shutdown Current < 1µA
• Thermal Protection
• TSOPJW-12 Package
Applications
• Bluetooth™ Headsets
• Cell Phones
• Digital Still Cameras
• MP3 Players
• Personal Data Assistants (PDAs)
• Set Top Boxes
Typical Application
+5V
+3.3V
IN1/IN2 Select
Enable
IN1
IN2
SEL
EN
OUT
IIN1
IIN2
GND
System Load
RIIN2
RIIN1
4674.2007.09.1.0
1




AAT4674 pdf, 반도체, 판매, 대치품
AAT4674
Power Supply Selector Switch
Electrical Characteristics1
VINX = 5V, TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Operation
VIN1
VIN2
VUVLO_IN1
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VUVLO_IN2
Description
IN1 Operating Voltage Range
IN2 Operating Voltage Range
IN1 Under-Voltage Lockout
IN2 Under-Voltage Lockout
IIN1_OP
IN1 Normal Operating Current
IIN1_SHDN
IN1 Shutdown Mode Current
IIN1_SLP
IN1 Sleep Current
IIN2_OP
IN2 Normal Operating Current
IIN2_SHDN
IN2 Shutdown Mode Current
IIN2_SLP
IN2 Sleep Current
Power Switches
RDS(ON) IN1 IN1-to-OUT FET On-Resistance
RDS(ON) IN2 IN2-to-OUT FET On-Resistance
OUT Voltage Droop From the
Lower Voltage of IN1 and IN2,
VDROOP_OUT When Switching Over Between
IN1 and IN2
Current Regulation
tSOFT_START Soft-Start Delay
ILIM_range
IN1/IN2 Current Limit Range
ILIM_ACC
IN1/IN2 Current Limit Accuracy
Logic Control / Protection
VIH(EN)
VIL(EN)
TSHDN
Logic High Threshold
Logic Low Threshold
Chip Thermal Shutdown
Temperature
Conditions
Rising edge
Hysteresis
Rising edge
Hysteresis
VIN1 = 5V, VEN = 0V
VIN1 = VEN = 5V, OUT open
VIN1 = 2.5V, VIN2 = 5V, VEN =0V
VIN2 = 5V, VEN = 0V
VIN2 = VEN = 5V, OUT open
VIN1 = 5V, VIN2 = 2.5V, VEN = 0V
VIN1 = 5.0V
VIN1 = 3.5V
VIN2 = 5.0V
VIN2 = 3.5V
IO(OUT) = 0.5A, CO(OUT) = 10µF
Delay of start from EN, or UVLO
RIIN1/IIN2 = 100kΩ
Threshold
Hysteresis
Min Typ Max Units
2.5 6 V
2.5 6 V
2.3
0.1
V
2.3
0.1
V
10 30 µA
1 µA
1 5 µA
10 30 µA
1 µA
1 5 µA
0.12 0.15
0.14 0.18
0.12 0.15
0.14 0.18
Ω
Ω
150 mV
100 µs
0.2 2.0 A
0.8 1 1.2 A
1.6 V
0.4 V
140
15 °C
1. The AAT4674 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
4 4674.2007.09.1.0

4페이지










AAT4674 전자부품, 판매, 대치품
Typical Characteristics
3.6V to 3.6V Transition Response
(IOUT = 500mA, COUT = 10µF)
VOUT
(1V/div)
3.6V
3.6V
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VSEL
(2V/div)
2V
0V
Time (40µs/div)
Short Circuit Through 0.6Ω Response
VIN
(2V/div)
5V
IOUT
(5A/div)
VOUT
(5V/div)
0A
5V
2A
1.2V
Time (10µs/div)
AAT4674
Power Supply Selector Switch
Short Circuit Through 0.3Ω Response
VIN
(2V/div)
5V
IOUT
(5A/div)
VOUT
(5V/div)
0A
5V
2A
0.6V
Time (10µs/div)
Thermal Shutdown Response
(VIN = 5V)
VEN
(2V/div)
2V
0V
VOUT
(2V/div)
IOUT
(2A/div)
0V
0A
Time (40ms/div)
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