LTC3225 Datasheet, PDF (3/12 Pages) Linear Technology – 150mA Supercapacitor Charger

LTC3225
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V, C_IN = 2.2μF, C_FLY = 1μF, unless otherwise specified.
SYMBOL
I_OUT
PARAMETER
Output Charging Current
V_PGOOD
I_PGOOD-LEAK
V_PG
V_PG-HYS
R_OL
f_OSC
V_SEL, SHDN
V_IH
V_IL
I_IH
I_IL
PGOOD Low Output Voltage
PGOOD High Impedance Leakage Current
PGOOD Low-to-High Threshold
PGOOD Threshold Hysteresis
Effective Open-Loop Output Impedance
(Note 4)
CLK Frequency
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
CONDITIONS
V_IN = 3.6V, R_PROG = 12k, V_OUT = 4.5V,
C_TOP = C_BOT
V_IN = 3.6V, R_PROG = 60k, V_OUT = 4.5V,
C_TOP = C_BOT
I_PGOOD = –1.6mA
V_PGOOD = 5V
Relative to Output Voltage Threshold
Relative to Output Voltage Threshold
V_IN = 3.6V, V_OUT = 4.5V
MIN TYP MAX UNITS
125
150
175
mA
26
mA
l
0.4
V
l
10
μA
l 92
94
96
%
l 0.25
1.2
2.5
%
8
Ω
l 0.6
0.9
1.5
MHz
l 1.3
l
l –1
l –1
V
0.4
V
1
μA
1
μA
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
reliabilty and lifetime.
Note 2: Based on long-term current density limitations.
Note 3: The LTC3225 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications 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
TYPICAL PERFORMANCE CHARACTERISTICS
(T_A = 25°C, C_FLY = 1μF, C_IN = 2.2μF, C_TOP = C_BOT, unless otherwise specified)
I_OUT vs R_PROG
160
140
V_IN = 3.6V
V_OUT = 4.5V
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70
R_PROG (kΩ)
3225 G01
I_OUT vs V_OUT (R_PROG = 12k)
180
160
140
120
100
80
60
40
C_TOP = C_BOT
V_IN = 2.8V
20
V_IN = 3.6V
V_IN = 5.5V
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V_OUT (V)
3225 G02
Efficiency vs V_IN
100
90
80
V_SEL = V_IN
70
V_SEL = 0
60
50
40
30
20
10 ^{ILOAD = 100mA}
C_TOP = C_BOT
0
2.5 3 3.5 4 4.5
V_IN (V)
5 5.5
3525 G03
3225f
3