13.3
Input/Output Terminal Characteristics
Note:
For all I/O terminal characteristics:
■
Current drawn into a pin is defined as positive; current supplied out of a pin is defined as negative.
13.3.1
Regulators: Available For External Use
13.3.1.1
1.8V Switch-mode Regulator
1.8V Switch-mode Regulator
Min
Typ
Max
Unit
Input voltage
2.70
3.70
4.25
V
Output voltage
1.70
1.80
1.90
V
Normal Operation
Transient settling time
-
30
-
μs
Load current
-
-
185
mA
Current available for external use, stereo audio with 16Ω load
(a)
-
-
25
mA
Peak conversion efficiency
(b)
-
90
-
%
Switching frequency
3.63
4.00
4.00
MHz
Inductor saturation current, stereo and 16Ω load
250
-
-
mA
Inductor ESR
0.1
0.3
0.8
Ω
Low-power Mode, Automatically Entered in Deep Sleep
Transient settling time
-
200
-
μs
Load current
0.005
-
5
mA
Current available for external use
-
-
5
mA
Peak conversion efficiency
-
85
-
%
Switching frequency
100
-
200
kHz
(a)
More current available for audio loads above 16Ω.
(b)
Conversion efficiency depends on inductor selection.
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 76 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
