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AS3525 Datasheet(PDF) 154 Page - ams AG

Part # AS3525
Description  Advanced Audio Processor System
PDF  194 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3525 Datasheet(HTML) 154 Page - ams AG

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AS3525-A/-B C22O22
Data Sheet, Confidential
© 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
Revision 1.13
154
- 194
7.4.16
15V Step-Up Converter
7.4.16.1 General
The integrated Step-Up DC/DC Converter is a high efficiency current-mode PWM regulator, providing an output voltage up to 15V. A constant
switching-frequency results in a low noise on supply and output voltages. When using an additional transistor the output voltage can be up to 25V
to drive 6 white LED in series.
It has an adjustable sink current (1.25 to 38.75mA) to provide e.g. dimming function when driving white LEDs as back-light.
7.4.16.2 Parameter
Table 141 15V Step-Up Converter Parameter
Symbol
Parameter
Notes
Min
Typ
Max
Unit
VSW
High Voltage Pin
Pin SW15
0
15
V
IVDD
Quiescent Current
Pulse Skipping mode
140
µA
VFB
Feedback Voltage, Transient Pin ISINK
0
5.5
V
VFB
Feedback Voltage, during
Regulation
Pin ISINK
0.65
0.83
1.0
V
ISW_MAX
Current Limit
V15_ON = 1
350
510
750
mA
RSW
Switch Resistance
V15_ON = 0
0.85
1.54
Ω
ILOAD
Load Current
@ 15V output voltage
0
45
mA
VPULSESKIP
Pulse-skip Threshold
Voltage at pin ISINK, pulse skips are
introduces when load current becomes
too low.
1.2
1.33
1.5
V
FIN
Fixed Switching Frequency
0.5
0.55
0.6
MHz
COUT
Output Capacitor
Ceramic
1
µF
L (Inductor)
ILOAD > 20mA
Use inductors with small CPARASITIC
(<100pF) for high efficency
17
22
27
µH
ILOAD < 20mA
8
10
27
tMIN_ON
Minimum On-Time
90
180
ns
MDC
Maximum Duty Cycle
Guaranteed per design
88
91
94
%
BVDD=3.6V; Tamb=25ºC; unless otherwise specified



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