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AAT1149 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1149
기능 Step-Down Converter
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AAT1149 데이터시트, 핀배열, 회로
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
General Description
Features
SwitchReg
The AAT1149 SwitchReg is a 3.0MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output voltage as low as 1.0V. It is opti-
mized to react quickly to load variations and oper-
ate with a tiny 0603 inductor that is only 1mm tall.
The AAT1149 output voltage is programmable via
external feedback resistors. It can deliver 400mA of
load current while maintaining a low 45μA no load
quiescent current. The 3.0MHz switching frequen-
cy minimizes the size of external components while
keeping switching losses low.
The AAT1149 maintains high efficiency throughout
the operating range, which is critical for portable
applications.
The AAT1149 is available in a Pb-free, space-saving
2.0x2.1mm SC70JW-8 package and is rated over
the -40°C to +85°C temperature range.
• Ultra-Small 0603 Inductor (Height = 1mm)
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable from 1.0V to VIN
• 400mA Max Output Current
• Up to 98% Efficiency
• 45μA No Load Quiescent Current
• 3.0MHz Switching Frequency
• 70μs Soft Start
• Fast Load Transient
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• SC70JW-8 Package
• Temperature Range: -40°C to +85°C
Applications
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
USB Devices
Typical Application
VIN = 3.6V
C2
4.7µF
U1
AAT1149
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.8V
L1 1.8µH
R1
118k
R2
59k
C1
4.7µF
1149.2006.11.1.0
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AAT1149 pdf, 반도체, 판매, 대치품
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
Electrical Characteristics1
VIN = 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Step-Down Converter
VIN Input Voltage
VUVLO
UVLO Threshold
VOUT
VOUT
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ILXLEAK
ΔVLinereg
VOUT
IOUT
TS
FOSC
TSD
THYS
EN
VEN(L)
VEN(H)
IEN
Output Voltage Tolerance
Adjustable Output Voltage Range
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
LX Leakage Current
Line Regulation
Out Threshold Voltage Accuracy
Out Leakage Current
Start-Up Time
Oscillator Frequency
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
VIN Rising
Hysteresis
VIN Falling
IOUT = 0 to 400mA,
VIN = 2.7V to 5.5V
No Load
VEN = GND
VIN = 5.5V, VLX = 0 to VIN,
VEN = GND
VIN = 2.7V to 5.5V
0.6V Output, No Load
TA = 25°C
0.6V Output
From Enable to Output
Regulation
TA = 25°C
VIN = VOUT = 5.5V
Min
2.7
1.8
-3.0
1.0
600
591
1.4
-1.0
Typ
100
45
0.45
0.40
0.1
600
70
3.0
140
15
Max Units
5.5 V
2.7 V
mV
V
3.0 %
VIN V
70 μA
1.0 μA
mA
Ω
Ω
1 μA
%/V
609 mV
0.2 μA
μs
MHz
°C
°C
0.6 V
V
1.0 μA
1. The AAT1149 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.
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AAT1149 전자부품, 판매, 대치품
Typical Characteristics
N-Channel RDS(ON) vs. Input Voltage
750
700
650 120°C 100°C
600
550
500
450 85°C
400
25°C
350
300
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Line Transient
(VOUT = 1.8; No Load; No Feedforward Capacitor)
4.50 1.94
4.25 1.92
4.00 1.90
3.75 1.88
3.50 1.86
3.25 1.84
3.00 1.82
2.75 1.80
2.50 1.78
Time (50µs/div)
Load Transient
(VOUT = 1.1V; No Feedforward Capacitor)
1.30 2.00
1.20 1.75
1.10 1.50
400mA
1.00 1.25
0.90 1.00
0.80
1mA
0.75
0.70 0.50
0.60 0.25
0.50 0.00
Time (50µs/div)
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
P-Channel RDS(ON) vs. Input Voltage
750
700
650 120°C 100°C
600
550
500 85°C
450
25°C
400
350
300
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Line Transient
(VOUT = 1.8; CFF = 100pF)
1.86
4.50
1.85
4.25
1.84
4.00
1.83
3.75
1.82
3.50
1.81
3.25
1.80
3.00
1.79
2.75
1.78
2.50
Time (20µs/div)
Load Transient
(VOUT = 1.1V; CFF = 100pF)
1.30
2.00
1.20
1.75
1.10
1.50
1.00
400mA
1.25
0.90
1mA
1.00
0.80
0.75
0.70
0.50
0.60
0.25
0.50
0.00
Time (50µs/div)
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