Datasheet

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