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AAT1112 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1112
기능 Step-Down Converter
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AAT1112 데이터시트, 핀배열, 회로
General Description
The AAT1112 SwitchReg is a 1.5A step-down con-
verter with an input voltage range of 2.4V to 5.5V
and an adjustable output voltage from 0.6V to VIN.
The 1.4MHz switching frequency enables the use
of small external components. The small footprint
and high efficiency make the AAT1112 an ideal
choice for portable applications.
The AAT1112 delivers 1.5A maximum output current
while consuming only 42µA of no-load quiescent
current. Ultra-low RDS(ON) integrated MOSFETs and
100% duty cycle operation make the AAT1112 an
ideal choice for high output voltage, high current
applications which require a low dropout threshold.
The AAT1112 provides excellent transient
response and high output accuracy across the
operating range. No external compensation com-
ponents are required.
The AAT1112 is designed to maintain high efficien-
cy throughout the load range. Pulling the MODE/
SYNC pin high enables "PWM Only" mode, main-
taining constant frequency and low output ripple
across the operating range. Alternatively, the con-
verter may be synchronized to an external clock
input via the MODE/SYNC pin. Over-temperature
and short-circuit protection safeguard the AAT1112
and system components from damage.
The AAT1112 is available in a Pb-free, space-sav-
ing TDFN33-12 or 2.75x3mm TSOPJW-12 pack-
age. The product is rated over an operating tem-
perature range of -40°C to +85°C.
AAT1112
1.5A, 1.4MHz Step-Down Converter
Features
SwitchReg
• 1.5A Maximum Output Current
• Input Voltage: 2.4V to 5.5V
• Output Voltage: 0.6V to VIN
• Up to 95% Efficiency
• 42µA No Load Quiescent Current
• No External Compensation Required
• 1.4MHz Switching Frequency
• Synchronizable to External Clock
• Optional "PWM Only" Low Noise Mode
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit
Protection
• <1µA Shutdown Current
• TSOPJW-12 or TDFN33-12 Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
Typical Application
VIN
C2
10µF
VP LX
AAT1112
VIN
EN FB
MODE/SYNC
GND
PGND
L1
3.3µH
VOUT= 3.3V
R1
267kΩ
R2
59kΩ
C1
22µF
1112.2007.01.1.1
1




AAT1112 pdf, 반도체, 판매, 대치품
AAT1112
1.5A, 1.4MHz Step-Down Converter
Electrical Characteristics1
VIN = 3.6V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
VIN
VOUT
VUVLO
Description
Input Voltage
Output Voltage Range
UVLO Threshold
VOUT
IQ
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
ILXLEAK
ILXLK, R
ΔVLOADREG
ΔVLINEREG/ΔVIN
VFB
IFB
FOSC
Output Voltage Tolerance
Quiescent Current
Shutdown Current
Current Limit
High Side Switch On-Resistance
Low Side Switch On-Resistance
LX Leakage Current
LX Reverse Leakage Current
Load Regulation
Line Regulation
Feedback Threshold Voltage
Accuracy (Adjustable Version)
FB Leakage Current
Internal Oscillator Frequency
Synchronous Clock
TS
TSD
THYS
EN
VIL
VIH
IEN
MODE/SYNC
VMODE/SYNC(L)
VMODE/SYNC(H)
IMODE/SYNC
Start-Up Time
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Enable Threshold Low
Enable Threshold High
Enable Leakage Current
Enable Threshold Low
Enable Threshold High
Enable Leakage Current
Conditions
VIN Rising
Hysteresis
VIN Falling
IOUT = 0A to 1.5A,
VIN = 2.4V to 5.5V
No Load
VEN = GND
VIN = 5.5V, VLX = 0 to VIN
VIN Unconnected, VLX = 5.5V,
VEN = GND
ILOAD = 0A to 1.5A
VIN = 2.4V to 5.5V
No Load, TA = 25°C
VOUT = 1.0V
From Enable to Output
Regulation
Min Typ Max Units
2.4 5.5 V
0.6 VIN V
2.4 V
250 mV
1.8 V
-3.0 3.0 %
42 90
1.0
1.8
0.120
0.085
1.0
µA
µA
A
Ω
Ω
µA
1.0 µA
0.5 %
0.2 %/V
0.591 0.60 0.609 V
0.2 µA
1.12
0.60
1.4
1.68
3.0
MHz
150 µs
140 °C
15 °C
VIN = VEN = 5.5V
VIN = VEN = 5.5V
0.6 V
1.4 V
-1.0 1.0 µA
0.6 V
1.4 V
-1.0 1.0 µA
1. The AAT1112 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 1112.2007.01.1.1

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AAT1112 전자부품, 판매, 대치품
AAT1112
1.5A, 1.4MHz Step-Down Converter
Typical Characteristics
100
90
80
70
60
50
40
30
0.1
Efficiency vs. Output Current
(PFM Mode; VOUT = 1.2V)
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
1 10 100 1000
Output Current (mA)
10000
0.50
0.25
0.00
-0.25
-0.50
0.1
Load Regulation
(PFM Mode; VOUT = 1.2V)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1 10 100 1000
Output Current (mA)
10000
Efficiency vs. Output Current
(PWM Mode; VOUT = 1.2V)
100
90
80
70
60
50
40
30
20
10
0
1
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
10
100
1000
10000
Output Current (mA)
0.50
0.25
0.00
-0.25
-0.50
0.1
Load Regulation
(PWM Mode; VOUT = 1.2V)
VIN = 2.7V VIN = 3.6V
VIN = 4.2V
1 10 100 1000
Output Current (mA)
10000
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40
Output Voltage vs. Temperature
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1A)
-20 0
20 40 60
Temperature (°C)
80
Supply Current vs. Supply Voltage
(VOUT = 1.8V; No Load; PFM Mode)
70
65
60
85°C
25°C
55
50
45
40
35 -40°C
30
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Supply Voltage (V)
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