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REV. 0
–3–
ADP3408
Parameter
Symbol
Condition
Min
Typ
Max
Unit
RTC LDO
REAL-TIME CLOCK LDO/
COIN CELL CHARGER (VRTC)
Maximum Output Voltage
ADP3408ARU-2.5
ADP3408ARU-1.8
Off Reverse Input Current
Output Capacitor Required for Stability
VRTC
VRTC
I
L
C
O
1
μ
A
≤
I
LOAD
≤
10
μ
A
1
μ
A
≤
I
≤
10
μ
A
V
BAT
= 2.15 V, T
A
= 25
°
C
2.39
1.80
2.45
1.95
2.51
2.1
0.5
V
V
μ
A
μ
F
0.1
ANALOG LDO (VAN)
Output Voltage
Line Regulation
Load Regulation
VAN
VAN
VAN
Line, Load, Temp
Min Load
50
μ
A
≤
I
≤
130 mA,
V
BAT
= 3.6 V
2.40
2.45
2
8
2.50
V
mV
mV
Output Capacitor Required for Stability
Ripple Rejection
C
O
VBAT/
VAN
3
V
NOISE
2.2
65
μ
F
dB
f = 217 Hz
V
BAT
= 3.6 V
f = 10 Hz to 100 kHz
I
LOAD
= 130 mA
V
BAT
= 3.6 V
Output Noise Voltage
80
μ
V rms
TCXO LDO (VTCXO)
Output Voltage
Line Regulation
Load Regulation
VTCXO
VTCXO
VTCXO
Line, Load, Temp
Min Load
50
μ
A
≤
I
≤
20 mA,
V
BAT
= 3.6 V
2.66
2.715
2
1
2.77
V
mV
mV
Output Capacitor Required for Stability
Dropout Voltage
C
O
V
DO
0.22
μ
F
mV
V
O
= V
INITIAL
– 100 mV
I
= 20 mA
f = 217 Hz
V
= 3.6 V
f = 10 Hz to 100 kHz
I
LOAD
= 20 mA,
V
BAT
= 3.6 V
160
310
Ripple Rejection
VBAT/
VTCXO
V
NOISE
65
dB
Output Noise Voltage
80
μ
V rms
MEMORY LDO (VMEM)
Output Voltage
Line Regulation
Load Regulation
VMEM
VMEM
VMEM
Line, Load, Temp
Min Load
50
μ
A < I
LOAD
< 60 mA,
V
BAT
= 3.6 V
2.744
2.80
2
3
2.856
V
mV
mV
mV
μ
F
mV
Output Capacitor Required for Stability
Dropout Voltage
C
O
2.2
80
180
REFOUT
Output Voltage
Line Regulation
Load Regulation
VREFOUT
VREFOUT
VREFOUT
Line, Load, Temp
Min Load
0
μ
A
< I
< 50
μ
A
V
= 3.6 V
f = 217 Hz
V
BAT
= 3.6 V, I
LOAD
= 50
μ
A
1.19
1.210
0.2
0.5
1.23
V
mV
mV
Ripple Rejection
VBAT/
VREFOUT
C
O
V
NOISE
65
75
dB
Maximum Capacitive Load
Output Noise Voltage
100
pF
μ
V rms
f = 10 Hz to 100 kHz,
V
BAT
= 3.6 V
40
RESET GENERATOR (RESET)
Output High Voltage
Output Low Voltage
Output Current
V
OH
V
OL
I
OL
/I
OH
I
OH
= 500
μ
A
I
OL
= –500
μ
A
V
OL
= 0.25 V,
V
OH
= V
MEM
– 0.25 V
V
MEM
– 0.25
V
V
mA
0.25
1
Delay Time per Unit Capacitance
Applied to RESCAP Pin
T
D
0.6
1.2
2.4
ms/nF
BATTERY VOLTAGE DIVIDER
Divider Ratio
Divider Impedance at MVBAT
Divider Leakage Current
Divider Resistance
BATSNS/MVBAT
Z
O
TCXOEN = High
2.32
59.5
2.35
85
2.37
110
1
385
k
k
μ
A
k
TCXOEN = Low
TCXOEN = High
215
300