13.3.1.3 Bypass LDO Regulator
Normal Operation
Min
Typ
Max
Unit
Input voltage
(a)
4.75 / 3.10
5.00
5.25
V
Output voltage (V
in
> 4.75V)
3.00
3.30
3.60
V
Output current (V
in
> 4.75V)
-
-
250
mA
(a)
Minimum input voltage of 4.75V is required for full specification, regulator operates at reduced load current from 3.1V.
13.3.2 Regulators: For Internal Use Only
13.3.2.1 1.35V Switch-mode Regulator
1.35V Switch-mode Regulator
Min
Typ
Max
Unit
Input voltage
2.70
3.60
4.25
V
Output voltage
1.30
1.35
1.40
V
Normal Operation
Transient settling time
-
30
-
μs
Load current
-
-
160
mA
Current available for external use, stereo audio with 16Ω load
-
-
0
mA
Peak conversion efficiency
(a)
-
88
-
%
Switching frequency
3.63
4.00
4.00
MHz
Inductor saturation current, stereo and 16Ω load
220
-
-
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
-
-
0
mA
Peak conversion efficiency
-
-
85
%
Switching frequency
100
-
200
kHz
(a)
Conversion efficiency depends on inductor selection.
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 78 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
