LTC3226
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 3). VIN = 3.3V, VCPO = 5V, VOUT = 3.3V, VMID = 1/2 VCPO
unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
l
V
Input Supply Range
2.5
5.5
IN
I
I
I
V
Quiescent Current in Normal Mode
V
V
> 1.2V, V
> 1.2V, V
> 1.2V, V < V
10
20
5
ꢀA
VIN(ST)
CPO(ST)
VOUT(ST)
IN
PFI
CPO_FB
IN
CPO
CPO Quiescent Current in Normal Mode
Quiescent Current in Normal Mode
> 1.2V, V < V
ꢀA
PFI
CPO_FB
IN
CPO
V
V
V
= V , V > 1.2V, V > 1.2V,
CPO_FB
ꢀA
OUT
OUT
IN
IN PFI
CPO
< V
I
I
CPO Quiescent Current in Backup Mode
Quiescent Current in Backup Mode
V
< 1.2V, V
> 0.8V, V
> V
OUT
24
3
ꢀA
ꢀA
CPO(BU)
PFI
LDO_FB
CPO
V
V
V
= 0V, V < 1.2V, V
> 0.8V,
VOUT(BU)
OUT
IN
CPO
PFI
OUT
LDO_FB
> V
Ideal Diode Controller
V
V
External Ideal Diode Forward Voltage (V -V
)
I
= 2mA
15
–45
45
mV
mV
mV
FWD(EDA)
RTO
IN OUT
VOUT
Fast Turn-Off Voltage (V -V
)
)
V
V
Falling
IN OUT
IN
Fast Turn-On Voltage (V -V
Falling
IN OUT
OUT
Charge Pump Supercapacitor Charger
l
l
V
CPO_FB Pin Threshold for Entering Sleep Mode
CPO_FB Pin Hysteresis for Exiting Sleep Mode
Charge Pump FB Pin Input Leakage
CLK Frequency
1.18
1.21
20
1.24
V
mV
nA
CPO_FB
I
f
V
= 1.3V
–50
50
CPO_FB
OSC
CPO_FB
0.75
0.9
6
1.05
MHz
Ω
R
Effective Open-Loop Output Impedance (Note 4)
PROG Pin Servo Voltage
V = 4.5V, C = 1ꢀF
CPO FLY
OL
l
V
V
< 1.2V
0.98
1.0
1.02
V
PROG
VIN(ILIM)
CPO_FB
I
Input Current Limit
R
R
= 33.3k, V
= 33.3k, V
= 0V
= 0V
360
10,500
mA
A/A
PROG
CPO
h
PROG
Ratio of V Input Current Limit to PROG Pin
IN
PROG
CPO
Current
I
I
I
CPO Pin Charging Current (1x Mode)
CPO Pin Charging Current (2x Mode)
Short-Circuit Charge Current
V
= 3.8V, R
= 33.3k, V
= 3V
315
157.5
600
mA
mA
mA
mV
CHRG(1x)
CHRG(2x)
SC
IN
PROG
CPO
R
= 33.3k
PROG
PROG Pin Grounded, V
= 0V
CPO
V
V
to CPO Voltage Differential for Switching
IN
200
MODE
Mode from 1x to 2x
1x/2x Mode Comparator Hysteresis
120
mV
V
l
l
V
V
Maximum Voltage Across Either Supercapacitor
After Charging
2.65
2.75
5.5
CLAMP
Maximum Supercapacitor Stack Voltage
VMID Output Voltage
5.3
2.5
V
V
STACK
VMID
VMID Current Sourcing Capability
VMID Current Sinking Capability
VMID < V /2, V
> 1.24V
> 1.24V
4.5
mA
mA
V
CPO
CPO_FB
VMID > V /2, V
5.5
CPO
CPO_FB
l
CPO_FB Pin Threshold Voltage (Rising) for
CAPGOOD
1.09
1.11
1.13
1
CPO_FB Pin Hysteresis for CAPGOOD
CAPGOOD Output Low Voltage
20
65
mV
mV
ꢀA
I
= 5mA
SINK
l
CAPGOOD High Impedance Leakage Current
V
= 5V
CAPGOOD
3226fa
3
Linear Systems [ Linear Systems ]
