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PDF AS1326 Data sheet ( Hoja de datos )
| Número de pieza | AS1326 | |
| Descripción | 0.8A DC-DC Step-Up Converters | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS1326 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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AS1326
High Current, 0.8A DC-DC Step-Up Converters
Data Sheet
1 Generalwww.datasheet4u.com Description
The AS1326A/AS1326B are high-efficiency, high cur-
rent, DC-DC step-up converters specifically designed for
battery-powered wireless applications. Low quiescent
supply current (65µA), high operating frequency (1MHz),
and minimal external component requirements make
these devices perfect for small hand-held applications.
Table 1. Standard Products
Model
Input Signal Activation
AS1326A
Logic-Low On
AS1326B
Logic-High On
Both devices use synchronous-rectified pulse-width
modulation (PWM) boost technology to generate 2.5 to
5.0V outputs from a wide range of inputs, such as 1 to 3
alkaline/NiCd/NiMH cells or a single lithium-ion (Li+)
cell. Automatic powersave operation significantly
improves efficiency at light-loads.
Continuous switching mode is available for applications
requiring constant-frequency operation at all load cur-
rents. PWM operation can also be synchronized to an
external clock to protect sensitive frequency bands in
communications equipment.
Analog soft-start and adjustable current limit permit opti-
mization of rush in current and external component size.
The AS1326A/AS1326B are available in a 10-pin TDFN
(3.0mm x 3.0mm) package.
2 Key Features
! Up to 800mA Output
! Constant-Frequency (1MHz) Operation
! Up to 96% Efficiency
! Input Range: 0.7 to 5.0V
! Fixed Output: 3.3V
! Adjustable Output: 2.5 to 5.0V
! PWM Synchronous-Rectified Technology
! Logic-Controlled Shutdown: 0.1µA
! Synchronizable Switching Frequency
(0.5 to 1.2MHz)
! Adjustable Current Limit
! Adjustable Soft-Start
! 10-pin TDFN (3.0mm x 3.0mm) Package
3 Applications
The devices are ideal for digital cordless phones. mobile
phones, wireless handsets, hand-held instruments,
PDAs, two-way pagers, and any battery-operated equip-
ment.
Figure 1. Block Diagram
5
+
OUT IC Power
Undervoltage
Lockout
AS1326B
only
AS1326A
only
10
ON
10
ONN
2
REF
3
2.15V –
On Rdy
1.25V Reference
Ref GND
GND
6
CLK/SEL
4
FB
1
ISET
AS1326
On Q
Startup
Osc
D
Controller
En Osc
1MHz Osc
CLK/SEL Mode
En
Osc
Mode
FB ISET
9
POUT
8
LX
7
PGND
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Revision 1.02
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1 page  
AS1326
Data Sheet - Electrical Characteristics
Table 4. Electrical Characteristics (Continued)
Symbol
Parameter
Logic Inputs
www.datasheet4u.com CLK/SEL Input Low Level
Condition
2.5V ≤ VOUT ≤ 5.0V
CLK/SEL Input High Level
ON, ONN Input Low Level 6
ON, ONN Input High Level 6
Input Leakage Current
Minimum CLK/SEL
Pulse Width
Maximum CLK/SEL
Rise/Fall Time
2.5V ≤ VOUT ≤ 5.0V
1.1V ≤ VOUT ≤ 1.8V
1.8V ≤ VOUT ≤ 5.0V
1.1V ≤ VOUT ≤ 1.8V
1.8V ≤ VOUT ≤ 5.0V
CLK/SEL, ON, ONN, TAMB = +25ºC
Min Typ Max Unit
0.8 x
VOUT
VOUT -
0.2
1.6
0.1
200
0.2 x
VOUT
0.2
0.4
1
V
V
V
V
µA
ns
100 ns
1. Operating voltage; since the regulator is bootstrapped to the output, once started, the AS1326 operates down to
0.7V input. If CLK/SEL = GND then VIN ≤ VOUT. If CLK/SEL = VOUT then VIN ≤ 0.75xVOUT.
2. Startup is tested with the circuit shown in Figure 25 on page 14.
3. Defines maximum step-up ratio.
4. The regulator is in startup mode until this voltage is reached. Caution: Do not apply full load current until the
device output > 2.3V.
5. Supply current into pin OUT. This current correlates directly to the actual battery-supply current, but is reduced
in value according to the step-up ratio and efficiency.
6. ON and ONN have a hysteresis of typically 0.15V.
www.austriamicrosystems.com
Revision 1.02
5 - 18
5 Page 
AS1326
Data Sheet - Application Information
9 Application Information
Figure 19. Typical AS1326A Application Circuit
www.datasheet4u.com
VIN = 2.4V
+
33µF
3.3µH
10nF
8
LX
10
ONN
6
CLK/SEL
1
ISET
2
REF
4
FB
3
GND
7
PGND
AS1326A
9
POUT
10Ω
+
100µF
5
OUT
330nF
VOUT = 3.3V
800mA
Setting the Output Voltages
For a fixed 3.3V output, connect pin FB to GND. To set adjustable output voltages between 2.5 and 5.0V, connect a
resistor voltage-divider to pin FB from pin OUT to GND (Figure 20).
Figure 20. Application Circuit using External Feedback Resistors
VIN = 2.4V
+
33µF
3.3µH
10nF
8
LX
10
ONN
6
CLK/SEL
1
ISET
2
REF
AS1326A
3
GND
7
PGND
9
POUT
5
OUT
4
FB
R1
R2
+
100µF
10Ω
330nF
VOUT
For the circuit shown in Figure 20, the input bias current into FB is <20nA, permitting large-value resistor-divider net-
works while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a ≤ 270kΩ
resistor for R2, then calculate R1 as:
R1
=
R2
⋅
⎛
⎝
V-----O----U----T-
VFB
–
1⎠⎞
(EQ 1)
Where:
VFB (the boost-regulator feedback set point) is 1.24V.
www.austriamicrosystems.com
Revision 1.02
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11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AS1326.PDF ] | |
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