LTC4425 Linear Technology, LTC4425 Datasheet - Page 3

• Manufacturer Part Number: LTC4425
• Description: Linear SuperCap Charger
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
junction temperature range, otherwise specifi cations are at T
SYMBOL PARAMETER
V
I
I
I
Ideal Diode
V
R
Supercap Charger
V
I
I
V
h
V
I
t
T
Voltage Clamps
V
V
I
I
Q(IN)
Q(OUT)
SD
FB
CHG
SC
SS
SH(TOP)
SH(BOT)
PROG
LIM
IN
FWD
FWD
FB
PROG
PROG
CLAMP
RIP
Operating Supply Range
Quiescent Current from V
Quiescent Current from V
Quiescent Current in Shutdown
Forward Voltage
Open Loop Forward On-Resistance
Feedback Voltage
Feedback Pin Input Leakage
Charge Current in LDO Mode
(FB = 0V)
Charge Current in Normal Mode (FB = V
PROG Pin Servo Voltage in LDO Mode
Ratio of Charge Current to PROG Pin Current
PROG Pin Servo Voltage in Normal Mode (FB = V
Charger Short-Circuit Current Limit
Charger Soft Start Time
Junction Temperature in Constant Temperature
Mode (Note 5)
Maximum Voltage Across the Top Capacitor
Maximum Voltage Across the Bottom Capacitor
V
Top Shunt Current
Bottom Shunt Current
OUT
Clamp Hysteresis
IN
OUT
IN
)
IN
) V
CONDITIONS
V
V
EN = 0
R
R
R
R
R
R
FB < 1.2V
V
PROG Pin Shorted to GND, FB = 0
FB = 0
V
V
V
V
V
If Either Capacitor Reaches Clamp
Voltage i.e. V
R
R
The
IN
IN
IN
IN
OUT
SEL
SEL
SEL
SEL
PROG
PROG
PROG
PROG
PROG
PROG
PROG
PROG
= V
= V
– V
– V
A
= Lo
= Hi
= Lo
= Hi
= 0, FB = 0, R
= T
l
= 0.5k
= 5k
= 0.5k, V
= 0.5k, V
= 5k, V
= 5k, V
OUT
OUT
OUT
OUT
= 1k, (V
= 1k, V
denotes the specifi cations which apply over the full operating
J
< 250mV
= 25°C, V
> 750mV
OUT
IN
IN
MID
OUT
IN
IN
– V
– V
< V
> V
– V
– V
– V
PROG
OUT
OUT
IN
OUT
OUT
CLAMP
IN
MID
< 250mV
> 750mV
= 0.5k
= 3.8V. (Note 4)
< 250mV
> 750mV
) > V
CLAMP
l
l
l
l
l
l
MIN
1.18
2.7
2
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1000
1.00
1.00
2.45
2.45
TYP
100
200
105
160
140
1.2
0.2
0.2
0.1
1.5
2.7
2.7
20
15
50
20
50
3
2
2
3
LTC4425
MAX
1.22
2.75
2.75
5.5
2.5
2.5
3
4
mA/mA
UNITS
3
4425p
mΩ
mV
mA
mA
mV
mA
mA
ms
μA
μA
μA
nA
°C
V
V
A
A
A
A
V
V
V
A
V
V
V
V