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PDF AS1339 Data sheet ( Hoja de datos )
| Número de pieza | AS1339 | |
| Descripción | 650mA RF Step-Down DC-DC | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1339
650mA RF Step-Down DC-DC for PA, with two LDOs
Datasheet
1 General Description
The AS1339 is a high-frequency step-down converter
optimized for dynamically powering the power amplifier
(PA) in WCDMA or NCDMA handsets. The device uses
a 110mΩ typical bypass FET to power the PA directly
from the battery during high-power transmission. The IC
integrates two 10mA low-noise, low-dropout regulators
(LDOs) for PA biasing.
With a switching frequency of 2MHz, the device allows
optimization for smallest solution size or highest
efficiency. The AS1339 supports fast switching using
small ceramic 10μF input and 4.7µF output capacitors to
maintain low ripple voltage.
The AS1339 uses an analog input driven by an external
DAC to control the output voltage linearly for continuous
PA power adjustment. The gain from REFIN to OUT is
2.5V/V. At high-duty cycle, the device automatically
switches to a bypass mode, connecting the input to the
output through a low-impedance MOSFET. The LDOs
are designed for low-noise operation, wherein each LDO
in the device is individually enabled through its own logic
control interface. The device is available in a 16-pin
WLP (2x2mm) package.
2 Key Features
! Fixed Switching Frequency: 2MHz
! PA Step-Down Converter
! Low Dropout Voltage
! Low Output-Voltage Ripple
! Dynamic Output Voltage Control (0.8V to 3.75V)
! 30µs Settling Time for 0.8V to 3.4V Output Voltage
Change
! 650mA Output Drive Capability
! Two 10mA Low-Noise LDOs
! Low Shutdown Current
! Supply Voltage Range: 2.7V to 5.5V
! Thermal Shutdown
! 16-pin WLP (2x2mm) package
3 Applications
The AS1339 is ideal for WCDMA/NCDMA cellular
handsets, Wireless PDAs, and Smartphones.
Figure 1. Typical Operating Circuit
VIN
2.7V to 5.5V
IN1A
10µF
IN1B
Analog Control
REFIN
PA ON/OFF
PA_EN
LDO1 ON/OFF
EN1
LDO2 ON/OFF
EN2
NC
VIN
2.7V to 5.5V
TEST
IN2
1µF
AS1339
PAA
PAB
LX
2.2µH
PGND
NC
VPA
0.8V to 3.75V
4.7µF
AGND
LDO1 2.85V
0.1µF
LDO2 2.85V
0.1µF
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Revision 1.04
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1 page  
AS1339
Datasheet - Electrical Characteristics
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6 Electrical Characteristics
VIN1A = VIN1B = VIN2 = VPA_EN = VEN1 = VEN2 = 3.6V, TA = -40ºC to +85ºC. Typical values are at TA =+25ºC, (unless
otherwise specified), for external components refer to Table 5 on page 7.
Table 3. Electrical Characteristics
Symbol
Parameter
Input Supply
VIN Input Voltage Range
ISHDN Shutdown Supply Current
IQ
DC-DC No-Load Supply
Current
DCDC Output Voltage
Output Voltage Range
VOUT Output Voltage
Thermal Protection
Thermal Shutdown
Logic Control
PA_EN, EN1, EN2, Logic-
Input High Voltage
PA_EN, EN1, EN2, Logic-
Input Low Voltage
Logic-Input Current
(PA_EN, EN1, EN2)
REFIN
REFIN Operating
Common-Mode Range
REFIN gain VOUT/VREFIN2
REFIN Current
LX
RDSONP Pin-Pin Resistance for PFET
RDSONN Pin-Pin Resistance for NFET
fOSC
PFET Leakage Current
NFET Leakage Current
PFET Peak Current Limit
Internal Oscillator Frequency
Condition
VPA_EN = VEN1 = VEN2 = 0V1
VEN1 = VEN2 = 0V, ILOAD(DCDC) = 0mA,
switching, VIN = 4.5V, VOUT = 3.4V
PWM Mode
VREFIN = 0.32V, VIN = 3.9V
VREFIN = 0.84V, VIN = 3.9V
VREFIN = 1.36V, VIN = 3.9V
TA rising, 10ºC typical hysteresis
2.7V ≤ VIN ≤ 5.5V
2.7V ≤ VIN ≤ 5.5V
VIL = 0V
VIH = VIN = 5.5V
VREFIN = 0.32V
VREFIN = 0.84V, 1.36V
VREFIN = VIN = 5.5V
ISW = 200mA; TA = +25°C
ISW = 200mA
ISW = -200mA; TA = +25°C
ISW = -200mA
VIN = 5.5V, VLX = 0V
VIN = VLX = 5.5V
VLX = 0V
Min
2.7
0.8
0.75
2.05
3.319
1.4
-1
0.32
2.35
2.44
-1
1.8
Typ Max
5.5
0.1 1
4.5 6
3.85
0.8 0.85
2.1 2.15
3.4 3.481
+140
0.5
+1
50 75
1.5
2.50 2.65
2.50 2.56
+1
110
230
0.1
0.1
1100
2
200
230
415
485
3
3
2.2
Unit
V
µA
mA
V
V
V
V
ºC
V
V
µA
µA
V
V/V
V/V
µA
mΩ
mΩ
µA
µA
mA
MHz
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Revision 1.04
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5 Page 
AS1339
Datasheet - Typical Operation Characteristics
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Figure 21. DC-DC Efficiency vs Input Voltage;
VOUT = 1.0V
100
Figure 22. DC-DC Line Regulation, VOUT vs. VIN;
VOUT = 3.8V
4.5
90
80
70 Iout = 300mA
Iout = 400mA
Iout = 500mA
Iout = 600mA
60
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
4
3.5
Bypass
PWM
Mode
Mode
3
Iout = 300mA
Iout = 400mA
2.5 Iout = 500mA
Iout = 600mA
2
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
Figure 23. DC-DC Line Regulation, VOUT vs. VIN;
VOUT = 3.4V
4.5
Figure 24. DC-DC Line Regulation, VOUT vs. VIN;
VOUT = 2.0V
2.03
4
3.5
3
2.5
2
2.7
3.05
Bypass
Mode
PWM
Mode
Iout = 300mA
Iout = 400mA
Iout = 500mA
Iout = 600mA
3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
2.02
2.01
2.00
1.99
Iout = 300mA
1.98
Iout = 400mA
Iout = 500mA
Iout = 600mA
1.97
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
Figure 25. DC-DC Line Regulation, VOUT vs. VIN;
VOUT = 1.5V
1.53
Figure 26. DC-DC Line Regulation, VOUT vs. VIN;
VOUT = 1.0V
1.03
1.52 1.02
1.51 1.01
1.50 1
1.49
Iout = 300mA
Iout = 400mA
1.48 Iout = 500mA
Iout = 600mA
1.47
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
0.99
Iout = 300mA
Iout = 400mA
0.98 Iout = 500mA
Iout = 600mA
0.97
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
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| PDF Descargar | [ Datasheet AS1339.PDF ] | |
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