SWCS046N – MARCH 2010 – REVISED APRIL 2012
BACKUP BATTERY CHARGER
over operating free-air temperature range (unless otherwise noted)
PARAMETER
End-of-charge backup battery
voltage
(1)
TEST CONDITIONS
MIN
350
–3%
–3%
–3%
VBAT –
0.3 V
10
TYP
500
3.15
3
2.52
MAX
700
+3%
+3%
+3%
VBAT
µA
V
UNIT
µA
Backup battery charging current VBACKUP = 0 to 2.4 V, BBCHEN = 1
VCC7 = 3.6 V, BBSEL = 10
VCC7 = 3.6 V, BBSEL = 00
VCC7 = 3.6 V, BBSEL = 01
VCC7 = 3.6 V, BBSEL = 11
Ground current
(1)
On mode
Note:
(a) BBSEL = 10, 00, or 01 intended to charge battery or superCap
(b) BBSEL = 11 intended to charge capacitor
VRTC LDO
over operating free-air temperature range (unless otherwise noted)
PARAMETER
Input voltage V
IN
DC output voltage V
OUT
Rated output current I
OUTmax
DC load regulation
DC line regulation
On mode
Back-up mode
On mode, 3.0 V < V
IN
< 5.5 V
Back-up mode, 2.3 V
≤
V
IN
≤
2.6 V
On mode
Back-up mode
On mode, I
OUT
= I
OUTmax
to 0
Back-up mode, I
OUT
= I
OUTmax
to 0
On mode, V
IN
= 3.0 V to V
INmax
@ I
OUT
= I
OUTmax
Back-up mode, V
IN
= 2.3 V to 5.5 V @ I
OUT
=
I
OUTmax
Transient load regulation
On mode, V
IN
= V
INmin
+ 0.2 V to V
INmax
I
OUT
= I
OUTmax
/2 to I
OUTmax
in 5 µs
and I
OUT
= I
OUTmax
to I
OUTmax
/2 in 5 µs
Transient line regulation
On mode, V
IN
= V
INmin
+ 0.5 V to V
INmin
in 30 µs
And V
IN
= V
INmin
to V
INmin
+ 0.5 V in 30 µs, I
OUT
=
I
OUTmax
/2
Turn-on time
Ripple rejection
I
OUT
= 0, V
IN
rising from 0 up to 3.6 V, @ V
OUT
=
0.1 V up to V
OUTmin
V
IN
= V
INDC
+ 100 mV
pp
tone, V
INDC+
= V
INmin
+
0.1 V to V
INmax
@ I
OUT
= I
OUTmax
/2
f = 217 Hz
f = 50 kHz
Ground current
Device in ACTIVE state
Device in BACKUP or OFF state
(1)
These parameters are not tested. They are used for design specification only.
55
35
23
3
dB
µA
2.2
ms
25
(1)
TEST CONDITIONS
MIN
2.5
1.9
1.78
1.72
20
0.1
TYP
MAX
5.5
3
UNIT
V
V
mA
1.83
1.78
1.88
1.84
50
50
2.5
25
50
(1)
mV
mV
mV
mV
12
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