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PDF AS1332 Data sheet ( Hoja de datos )
| Número de pieza | AS1332 | |
| Descripción | 650mA Step-Down DC-DC Converter | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1332
Datasheet
650mA, Step-Down DC-DC Converter for RF Power Amplifiers
1 General Description
The AS1332 is a step-down DC-DC converter designed
to power radiofrequency (RF) power amplifiers (PAs)
from a single Li-Ion battery. The device also achieves
high-performance in mobile phones and similar RF PA
applications.
The AS1332 steps down an input voltage of 2.7V to 5.5V
to output voltages ranging from 1.3V to 3.16V. Using a
VCON analog input, the output voltage is set for
controlling power levels and efficiency of the RF PA.
The RF interferences are minimized due to the fixed-
frequency PWM operation. The battery consumption is
reduced to 0.01µA (typ.) during shutdown.
Because of the high switching frequencies (2 MHz) tiny
surface-mount components can be used. Additional to
the small size the amount is also small. Only three
external components are required, an inductor and two
ceramic capacitors.
The AS1332 is available in a 8-pin WL-CSP.
2 Key Features
! PWM Switching Frequency: 2MHz
! Single Lithium-Ion Cell Operation (2.7V to 5.5V)
! Dynamic Programmable Output Voltage (1.3V to
3.16V)
! Maximum load capability of 650mA
! High Efficiency (96% Typ at 3.6VIN, 3.16VOUT at
400mA) from internal synchronous rectification
! Current Overload Protection
! Thermal Overload Protection
! Soft Start
! 8-pin WL-CSP
3 Applications
The AS1332 is an ideal solution for cellular phones,
hand-held radios, RF PC cards, and battery powered RF
devices.
Figure 1. Typical Application Circuit
VIN
2.7V to 5.5V
10 µF
EN
VCON
0.52V to 1.27V
PVIN
VDD
AS1332
3.3 µH
SW
FB
4.7 µF
VOUT
1.3V to 3.16V
VOUT = 2.5 x VCON
VCON
PGND
AGND
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1 page  
AS1332
Datasheet - Electrical Characteristics
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System Characteristics
TA = 25ºC; PVIN = VDD = EN = 3.6V, unless otherwise noted. The following parameters are verfied by characterisation
and are not production tested.
Table 4. System Characteristics
Symbol
Parameter
Control Inputs
TRESP
Time for VOUT to rise from
1.3V to 3.16V
Time for VOUT to fall from
3.16V to 1.3V
Conditions
VIN = 4.2V, COUT = 4.7µF,
L = 3.3µH, RLOAD = 5Ω
VIN = 4.2V, COUT = 4.7µF,
L = 3.3µH, RLOAD = 10Ω
Min
Typ
Max
Unit
s
20 30
µs
20 30
CCON VCON Input Capacitance
Linearity in Control
Linearity Range 0.556V to 1.208V
VCON = 1V, Test frequency = 100 kHz
VIN = 3.6V,
Monotonic in nature
-3
20 pF
+3 %
T_ON
Turn-On Time
EN = Low to High, VIN = 4.2V,
(time for output to reach 3.16V from
enable low to high transition)
VOUT = 3.16V, COUT = 4.7µF, IOUT ≤ 1mA
Performance Parameters
210 750 µs
Efficiency
η (L = 3.3µH, DCR ≤ 100mΩ)
VOUT-
ripple
Ripple voltage, PWM mode1
Line_tr Line transient response
Load_tr Load transient response
VIN = 3.6V, VOUT = 1.3V,
PSRR IOUT = 100mA
VIN = 3.6V, VOUT = 1.3V, IOUT = 90mA
VIN = 3.6V, VOUT = 3.16V, IOUT = 400mA
VIN = 3V to 4.5V, VOUT = 1.3V,
IOUT = 10mA to 400mA
VIN = 600mV perturbance, over Vin range
3V to 5.5V; TRISE = TFALL = 10µs,
VOUT = 1.3V, IOUT = 100mA
VIN = 3.1/3.6/4.5V, VOUT = 1.3V, transients
up to 100mA, TRISE = TFALL = 10µs
sine wave perturbation frequency = 10kHz,
amplitude = 100mVp-p
87
%
96
10
mVp
-p
50
mVp
k
50
mVp
k
40 dB
1. Ripple voltage should measured at COUT electrode on good layout PC board and under condition using sug-
gested inductors and capacitors.
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AS1332
Datasheet - Detailed Description
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8 Detailed Description
For driving RF power amplifiers in portable devices and battery powered RF devices the AS1332 is a very suitable DC-
DC converter. The AS1332 features current overload protection, thermal overload shutdown and soft start. Besides
these features the device also displays the following characteristics:
! Current-mode buck architecture with synchronous rectification for high efficiency.
! Operation at maximum efficiency over a wide range of power levels from a single Li-Ion battery cell.
! The maximum load capability of 650mA is provided in PWM mode, wherein the maximum load range may vary
depending on input voltage, output voltage and the selected inductor.
! Efficiency is of around 96% for a 400mA load with 3.16V output and 3.6V input.
! For longer battery life, the output voltage can be dynamically programmable from 1.3V (typ) to 3.16V (typ) by
adjusting the voltage on the control pin without the need for external feedback resistors.
Figure 30. AS1332 Block Diagram
VDD PVIN
FB
VCON
EN
Oscillator
Clamp
Logic and
Soft Start
Main Control
Shutdown
Control
Current
Sense
Mosfet
Control
Logic
AS1332
SW
AGND
PGND
AS1332 is fabricated using a 8-pin WL-CSP, which requires special design considerations for implementation. Its fine
bumppitch requires careful board design and precision assembly equipment. This package offers the smallest possible
size, for space-critical applications such as cell phones, where board area is an important design consideration. The
size of the external components is reduced by using a high switching frequency (2MHz). For implementation only three
external power components are required (see Figure 1 on page 1). The 8-pin WL-CSP package is appropriate for
opaque case applications, where its edges are not subject to high intensity ambient red or infrared light. Also the
system controller should set EN low during power-up and other low supply voltage conditions. See Shutdown Mode on
page 13.
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AS1332.PDF ] | |
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