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PDF AAT1171 Data sheet ( Hoja de datos )
| Número de pieza | AAT1171 | |
| Descripción | Voltage-Scaling Step-Down Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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 1. - Step-Down Converter - Skyworks  Hay una vista previa y un enlace de descarga de AAT1171 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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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
1 page  
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 Description
PWM/Light Load/EN
VEN(L)
VEN(H)
IEN
Enable Threshold Low
Enable Threshold High
Input Low Current
tEN Turn-On Enable Response Time
SYNC
FSYNC
VSYNC(H)
VSYNC(L)
ISYNC
DAC Input
Gain
Synchronization Frequency
SYNC High Level Threshold
SYNC Low Level Threshold
SYNC Low Current
Output Voltage/DAC Voltage3
Conditions
VCC = 5.5V
EN = Low to High, MODE/SYNC =
High, VDAC = 1.2V
Sync to 19.8MHz2
VSYNC = GND or VCC
Min Typ Max Units
1.4
-1.0
150
0.6
1.0
V
V
µA
µs
19.8
1.6
-1.0
0.6
1.0
MHz
V
µA
3 V/V
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.
2. Please contact Sales for other synchronization frequencies.
2. Please contact Sales for other output voltage/DAC voltage gains.
1171.2006.06.1.0
5
5 Page 
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Typical Characteristics
DAC to Bypass Transient Response
(LL Mode; VIN = 4.2V; RL = 10Ω; COUT = 4.7µF; L = 2.2µH)
4.2V
VOUT
1V/div
0
VDAC
0.5V/div
0
0.6V
1.3V
0.2V
Time (25µs/div)
VOUT
1V/div
0
Enable
2V/div
0
IIN
200mA/div
0
Enable Soft Start
(VIN = 3.6V; VOUT = 1.8V; RL = 4.5Ω;
COUT = 4.7µF; L = 2.2µH)
1.8V
Time (50µs/div)
Load Transient Response
(VIN = 4.2V; VOUT = 3.3V; COUT = 4.7µF; L = 2.2µH)
VOUT
(AC coupled)
20mV/div
3.51V
3.26V
IOUT
200mA/div
525mA
250mA
Time (20µs/div)
Load Transient Response
(VIN = 3.6V; VOUT = 1.8V; COUT = 4.7µF; L = 2.2µH)
VOUT
(AC coupled)
20mV/div
1.914V
500mA
1.798V
IOUT
100mA/div
200mA
Time (20µs/div)
Line Transient Response
(VOUT = 1.5V; RL = 10Ω; COUT = 4.7µF; L = 2.2µH)
VIN
0.5V/div
3.6V
3.0V
VOUT
(AC coupled)
50mV/div
1.56V
1.44V
Time (50µs/div)
1171.2006.06.1.0
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AAT1171.PDF ] | |
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