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AS3525 bảng dữ liệu(PDF) 121 Page - ams AG

tên linh kiện AS3525
Giải thích chi tiết về linh kiện  Advanced Audio Processor System
PDF  194 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
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AS3525 bảng dữ liệu(HTML) 121 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
121
- 194
7.4.2
3V Step-Up Converter
7.4.2.1
General
•
Output voltage 3V to 3.6V (BVDD) programmable in 4 steps via DCDC3p bit to save power
•
Input voltage 1V (1.2V) to 3V, voltages higher than that can be connected to BVDD directly
•
Maximum output current to BVDD: 150mA
•
Current mode operation
•
On-chip compensation and feedback network
•
On chip 300mΩ NMOS switch
•
PWM mode with 1.2MHz switching frequency
•
Inductor current limitation 850mA
•
Pulse skipping capability
•
Low quiescent current: 40μA in PFM-mode, 300μA in PWM mode
•
≤1μA shutdown current
•
uses external coil (6.8
μH) and Schottky diode (500mA)
Figure 45 DCDC 3V Block Diagram
7.4.2.2
Parameter
Table 99 DCDC Boost Parameter
Symbol
Parameter
Notes
Min
Typ
Max
Unit
Power down mode
5
μA
PFM mode operation
40
μA
IVDD2.9
Supply Current
PWM mode (low output load)
300
μA
VSTARTUP
Startup Voltage
RLoad>220Ω
1.0
V
VHOLD
Hold-on Voltage
IOUT=1mA, VBAT falling from 1.5 to 0V
0.5
V
RSW_on
Internal Switch RDS_ON
300
mΩ
fSW
Switching Frequency
Start-up, X3VOK=1
100
250
500
kHz
PWM mode operation, X3VOK=0
1.2
MHz
tON_min
Minimum On-time
100
ns
tOFF_min
Minimum Off-time
100
ns
ηeff
Efficiency
IOUT=20mA, Vin=1.35
85
%
IOUT=50mA, Vin=1.5
87
%
ISW_LIM
Current Limit
1.0V ≤ VB1V ≤ 3.0V
0.60
0.85
1.10
A
IOUT
Load Current
VB1V=1.0V
150
mA
Vin=1.0..2.0V, C(VBAT_1V) = 2.2
μF ceramic || 2000μF Elko, C(BVDD) = 3 x 2.2μF ceramic, L=DS1608 6.8μH, Temp = 25deg



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