Datasheet

LTC3225/LTC3225-1
3
3225fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range V
SEL
= V
IN
V
SEL
= 0
l
l
2.8
2.8
5.5
5.5
V
V
V
COUT
Charge Termination Voltage
Sleep Mode Threshold (Rising Edge)
V
SEL
= V
IN
V
SEL
= 0
l
l
4.4
3.9
4.5
4.0
4.6
4.1
V
V
V
COUT-HYS
Output Comparator Hysteresis 100 mV
V
TOP/BOT
Maximum Voltage Across Each of the
Supercapacitors After Charging
V
SEL
= V
IN
V
SEL
= 0
l
l
2.35
2.1
V
V
LTC3225/LTC3225-1
I
Q-VIN
No Load Operating Current at V
IN
I
OUT
= 0mA
l
20 40 µA
I
SHDN-VIN
Shutdown Current SHDN = 0V, V
OUT
= 0V
l
0.1 1 µA
I
COUT
C
OUT
Leakage Current V
OUT
= 5.6V, SHDN = 0V
V
OUT
= 5.6V, Charge Pump in Sleep Mode
V
OUT
= 5.6V, SHDN Connected to V
IN
with
Input Supply Removed
l
l
1
2
3
4
1
µA
µA
µA
I
VIN
Input Charge Current V
IN
= 3.6V, R
PROG
= 12k, C
TOP
= C
BOT
306 mA
V
IN
= 3.6V, R
PROG
= 60k, C
TOP
= C
BOT
55 mA
I
OUT
Output Charge Current V
IN
= 3.6V, R
PROG
= 12k, C
TOP
= C
BOT
,
V
OUT
= 4.5V (LTC3225),
V
OUT
= 3.7V (LTC3225-1)
125 150 175 mA
V
IN
= 3.6V, R
PROG
= 60k, C
TOP
= C
BOT
,
V
OUT
= 4.5V (LTC3225),
V
OUT
= 3.7V (LTC3225-1)
26 mA
V
PGOOD
PGOOD Low Output Voltage I
PGOOD
= –1.6mA
l
0.4 V
I
PGOOD-LEAK
PGOOD High Impedance Leakage Current V
PGOOD
= 5V
l
10 µA
V
PG
PGOOD Low-to-High Threshold Relative to Output Voltage Threshold
l
92 94 96 %
V
PG-HYS
PGOOD Threshold Hysteresis Relative to Output Voltage Threshold
l
0.25 1.2 2.5 %
R
OL
Effective Open-Loop Output Impedance
(Note 4)
V
IN
= 3.6V, V
OUT
= 4.5V (LTC3225)
V
IN
= 3.6V, V
OUT
= 3.7V (LTC3225-1)
8
9
Ω
f
OSC
CLK Frequency
l
0.6 0.9 1.5 MHz
V
SEL
, SHDN
V
IH
Input High Voltage
l
1.3 V
V
IL
Input Low Voltage
l
0.4 V
I
IH
Input High Current
l
–1 1 µA
I
IL
Input Low Current
l
–1 1 µA
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, C
IN
= 2.2μF, C
FLY
= 1μF, unless otherwise specifi ed (Note 3).
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on long-term current density limitations.
Note 3: The LTC3225/LTC3225-1 are tested under pulsed load conditions
such that T
J
≈ T
A
. The LTC3225/LTC3225-1 are guaranteed to meet
performance specifi cations from 0°C to 85°C. Specifi cations over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 4: Output not in regulation;
R
OL
≡ (2 • V
IN
– V
OUT
)/I
OUT