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부품번호 AAT1171
기능 Voltage-Scaling Step-Down Converter
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AAT1171 데이터시트, 핀배열, 회로
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
General Description
Features
SwitchReg
The AAT1171 SwitchReg, a member of Analogic-
Tech's Total Power Management IC™ (TPMIC™)
• VIN Range: 2.7V to 5.5V
• Variable Output Voltage: 0.6V to 3.6V
product family, has been specifically designed to
• 600mA Output Current
dynamically control the operating voltage of a
• DAC Input: 0.2V to 1.2V
WCDMA or CDMA power amplifier inside single
• High Output Accuracy: ±3%
lithium-ion battery-powered systems. The AAT1171
• 45µA No Load Quiescent Current
outputs a voltage between 0.6V and 3.6V, thereby
• Internal Soft Start Limits Startup Current and
optimizing the amplifier efficiency at both low and
Output Voltage Overshoot
high transmit levels.
• Synchronizable to External 19.8MHz System
The AAT1171 output voltage is controlled via an
analog signal from the baseband processor. It can
deliver 600mA of continuous load current while
maintaining a low 45µA of no load quiescent current.
The 2MHz switching frequency minimizes the size of
external components while keeping switching losses
low. A low resistance MOSFET, typically 230mΩ,
provides a low dropout voltage as the battery input
Clock
• Over-Temperature and Current Limit Protection
• Integrated 85mΩ Bypass MOSFET
• 2MHz Operation
• PWM/LL Control with Override
• Fast 150µs Start-Up
• 3x3mm 12-Pin TDFN Package
• Temperature Range: -40°C to +85°C
voltage approaches the programmed output voltage
and the converter runs at 100% duty cycle. To fur-
ther improve system efficiency, an 85mΩ bypass
MOSFET transistor is also included to allow the PA
Applications
to be powered directly from the battery.
www.DataSheet4U.com
The AAT1171 feedback and control method gives
excellent load regulation and transient response
while maintaining small external components. The
output voltage responds in less than 30µs. The con-
• WCDMA or CDMA PA in Cellular Phones,
Smartphones, Feature Phones, etc.
• Express Card
• PCMCIA Data Cards
verter can be synchronized to an external system
clock, forced to operate in Light Load (LL) mode for
highest efficiency at light loads, or in Pulse Width
Modulation (PWM) mode for low noise operation.
The AAT1171 is available in a Pb-free, space-sav-
ing TDFN33-12 package and is rated over the
-40°C to +85°C temperature range.
Typical Application
10µF
DAC
Baseband
Processor
VIN
AAT1171
VCC
LX
BYPASS
MODE/SYNC
VOUT
EN
DAC
GNDx2
2.2µH
TX
RX
0.6V - 3.6V
4.7µF
VREF
VCC2 VCONT
VCC2
PA
1171.2006.06.1.0
1




AAT1171 pdf, 반도체, 판매, 대치품
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Electrical Characteristics1
TA = -40°C to +85°C, unless otherwise noted. VIN = VCC = 3.6V; typical values are TA = 25°C.
Symbol
VIN
VUVLO
VOUT
VDACIN
Description
Input Voltage
UVLO Threshold
UVLO Hysteresis
VOUT Programmable Range
Input Voltage Range from DAC
IQ Quiescent Current
ISHDN
ILIM
RDS(ON)H
RDS(ON)L
RDS(ON)BP
ILXLEAK
ΔVOUT/VOUT
ΔVOUT/
VOUT*ΔVIN
ROUT
VOUT
FOSC
TSD
THYS
ILL
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
Bypass Switch Resistance
LX Leakage Current
Load Regulation
Line Regulation
Feedback Impedance
Output Voltage Accuracy
Oscillator Frequency
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Light Load Load Current Threshold
tVOUTS
Output Voltage Settling Time
Conditions
Min Typ Max Units
2.7 5.5
VIN Rising
2.6
200
0.6 3.6
0.2 1.2
No Load, Light Load
45 70
No Load, PWM, VCC Bias Current
EN = AGND = PGND
420
1.0
TA = 25°C
1.2 1.6
230
230
VDAC = 1.3V or BYPASS = VIN
VCC = 5.5V, VLX = 0 to VCC
ILOAD = 0 to 500mA
85
1
0.5
V
V
mV
V
V
µA
µA
A
mΩ
mΩ
mΩ
µA
%
0.2 %/V
VDAC = 0.6V, ILOAD = 0
170 kΩ
1.746 1.8 1.854 V
2.0 MHz
140 °C
VOUT = 0.6V to VOUT(MAX),
MODE/SYNC = VIN
15
100
30
°C
mA
µs
1. The AAT1171 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 1171.2006.06.1.0

4페이지










AAT1171 전자부품, 판매, 대치품
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Typical Characteristics
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(PWM Mode; VOUT = 2.5V)
VIN = 3.0V
VIN = 4.2V
VIN = 5.0V
1 10 100
Output Current (mA)
1000
1.0
0.5
0.0
-0.5
-1.0
0.1
Load Regulation
(PWM Mode; VOUT = 2.5V)
VIN = 5.0V
VIN = 3.0V
VIN = 4.2V
1 10 100
Output Current (mA)
1000
Efficiency vs. Output Current
(LL Mode; VOUT = 1.8V)
100
90 VIN = 2.7V
80
70 VIN = 4.2V
60 VIN = 3.6V
Load Regulation
(LL Mode; VOUT = 1.8V)
1.0
0.5 VIN = 3.6V
VIN = 4.2V
0.0
50 -0.5 VIN = 2.7V
40
30
0.1
1
10 100 1000
-1.0
0
1 10 100 1000
Output Current (mA)
Output Current (mA)
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(PWM Mode; VOUT = 1.8V)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1 10 100
Output Current (mA)
1000.
1.0
0.5
0.0
-0.5
-1.0
0.1
Load Regulation
(PWM Mode; VOUT = 1.8V)
VIN = 3.6V
VIN = 4.2V
VIN = 2.7V
1 10 100
Output Current (mA)
1000
1171.2006.06.1.0
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AAT1171

Voltage-Scaling Step-Down Converter

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