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AAT1145 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 AAT1145
기능 1.2A Step-Down Converter
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AAT1145 데이터시트, 핀배열, 회로
SwitchRegTM
General Description
The AAT1145 SwitchReg™ is a 1.5MHz constant fre-
quency current mode PWM step-down converter. It is
ideal for portable equipment requiring very high current
up to 1.2A from single-cell Lithium-ion batteries while
still achieving over 90% efficiency during peak load con-
ditions. The AAT1145 also can run at 100% duty cycle
for low dropout operation, extending battery life in por-
table systems while light load operation provides very
www.DatalSohweeot4uUt.pcoumt ripple for noise sensitive applications.
The AAT1145 can supply up to 1.2A output load current
from a 2.5V to 5.5V input voltage and the output voltage
can be regulated as low as 0.6V. The high switching fre-
quency minimizes the size of external components while
keeping switching losses low. The internal slope compen-
sation setting allows the device to operate with smaller
inductor values to optimize size and provide efficient
operation.
The AAT1145 is available in adjustable (0.6V to VIN) and
fixed (1.8V) output voltage versions. The device is avail-
able in a Pb-free, 3x3mm 10-lead TDFN package and is
rated over the -40°C to +85°C temperature range.
PRODUCT DATASHEET
AAT1145
1.2A Step-Down Converter
Features
• Input Voltage Range: 2.5V to 5.5V
• Output Voltages from 0.6V to VIN
• 1.2A Output Current
• High Efficiency: Up to 95%
• 1.5MHz Constant Switching Frequency
• Low RDS(ON) Internal Switches: 0.15Ω
• Allows Use of Ceramic Capacitors
• Current Mode Operation for Excellent Line and Load
Transient Response
• Short-Circuit and Thermal Fault Protection
• Soft Start
• Low Dropout Operation: 100% Duty Cycle
• Low Shutdown Current: ISHUTDOWN < 1μA
• TDFN33-10 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• DSP Core Supplies
• PDAs
• Portable Instruments
• Smart Phones
Typical Application
VIN 2.5V-5.5V
C1
10μF
1 EN
2 IN
LX 8
LX 7
3 AIN AAT1145-1.8 OUT 5
6 AGND
4 AGND
PGND 10
PGND 9
L1
2.2μH
VOUT
1.8V,1.2A
C2
22μF
1145.2007.11.1.1
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AAT1145 pdf, 반도체, 판매, 대치품
SwitchRegTM
PRODUCT DATASHEET
AAT1145
1.2A 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
VIN
VOUT
IQ
IFB
Input Voltage Range2
Output Voltage Range
Input DC Supply Active Mode
Current
Shutdown Mode
Feedback Input Bias Current
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VFB Regulated Feedback Voltage3
ΔVLINEREG/
ΔVIN
ΔVLOADREG/
ΔIOUT
VFB
VOUT
FOSC
TS
TSD
THYS
ILIM
RDS(ON)
VEN(L)
VEN(H)
IEN
Line Regulation
Load Regulation
Output Voltage Accuracy
Oscillator Frequency
Startup Time
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Peak Switch Current
P-CH MOSFET
N-CH MOSFET
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
VFB = 0.5V
VEN = 0V, VAIN = 5.5V
VFB = 0.65V
TA = 25°C
TA = 0°C TA 85°C
TA = -40°C TA 85°C
VIN = 2.5V to 5.5V, IOUT = 10mA
IOUT = 10mA to 1200mA
VIN = 2.5 to 4.2V, IOUT = 10 to 1200mA
VFB = 0.6V
From Enable to Output Regulation
VIN = 3.6V
VIN = 3.6V
VIN = VEN = 5.5V
Min
2.5
0.6
0.5880
0.5865
0.5850
Typ
300
0.1
0.6000
0.6000
0.6000
0.10
Max
5.5
VIN
500
1
30
0.6120
0.6135
0.6150
0.20
Units
V
V
μA
μA
nA
V
%/V
0.50
%/A
-3 +3 %
1.2 1.5 1.8 MHz
1.3 ms
170 °C
10 °C
2.5 A
135
95
200
150
mΩ
0.3 V
1.5 V
-1.0
1.0 μA
1. The AAT1145 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
2. VIN should be not less than VOUT + VDROPOUT, where VDROPOUT = IOUT · (RDS(ON)PMOS + ESRINDUCTOR), typically VDROPOUT = 0.3V.
3. The regulated feedback voltage is tested in an internal test mode that connects VFB to the output of the error amplifier.
4
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AAT1145 전자부품, 판매, 대치품
SwitchRegTM
Functional Block Diagram
PRODUCT DATASHEET
AAT1145
1.2A Step-Down Converter
OSC
0.6V
Softstart
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OUT
Over-Temperature
and Short-Circuit
Protection
EN
ICOMP
R1*
R2*
VIN
0.65V
OVDET
REF
0.6V
SHUTDOWN
SLOPE
COMP
SET
RESET
PWM
LOGIC
ISENSE
AMP
NON-OVERLAP
CONTROL
IZERO
COMP
IN
VIN 2.5V to 5.5V
LX
L1
COUT
PGND
VOUT
R1*
R2*
AIN AGND
*The resistor divider R1 + R2 is internally set for the fixed output versions, and is externally set for the adjustable output versions.
Functional Description
The AAT1145 is a high output current monolithic switch-
mode step-down DC-DC converter. The device operates
at a fixed 1.5MHz switching frequency, and uses a slope
compensated current mode architecture. This step-down
DC-DC converter can supply up to 1200mA output cur-
rent at VIN = 3V and has an input voltage range from
2.5V to 5.5V. It minimizes external component size and
optimizes efficiency at the heavy load range. The slope
compensation allows the device to remain stable over a
wider range of inductor values so that smaller values
(1μH to 4.7μH) with lower DCR can be used to achieve
higher efficiency. Apart from the small bypass input
capacitor, only a small L-C filter is required at the output.
The fixed output version requires only three external
power components (CIN, COUT, and L). The adjustable ver-
sion can be programmed with external feedback to any
voltage, ranging from 0.6V to near the input voltage. It
uses internal MOSFETs to achieve high efficiency and can
generate very low output voltages by using an internal
reference of 0.6V. At dropout, the converter duty cycle
increases to100% and the output voltage tracks the
input voltage minus the low RDS(ON) drop of the P-channel
high-side MOSFET and the inductor DCR. The internal
error amplifier and compensation provides excellent
transient response, load and line regulation. Internal
soft start eliminates any output voltage overshoot when
the enable or the input voltage is applied.
Current Mode PWM Control
Slope compensated current mode PWM control provides
stable switching and cycle-by-cycle current limit for
excellent load and line response with protection of the
internal main switch (P-channel MOSFET) and synchro-
nous rectifier (N-channel MOSFET). During normal
operation, the internal P-channel MOSFET is turned on
for a specified time to ramp the inductor current at each
rising edge of the internal oscillator, and switched off
when the peak inductor current is above the error volt-
age. The current comparator, ICOMP, limits the peak
inductor current. When the main switch is off, the syn-
chronous rectifier turns on immediately and stays on
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