LTC3453_15 Datasheet, PDF (3/12 Pages) Linear Technology – Synchronous Buck-Boost High Power White LED Driver

LTC3453
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C, V_IN = V_OUT = 3.6V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
PMOS Switch Leakage
Switches A and D
●
1
NMOS Switch Leakage
Switches B and C
●
1
Oscillator Frequency
0.9
1
1.1
Soft-Start Time
0.65
UNITS
µA
µA
MHz
ms
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: The LTC3453E is guaranteed to meet specifications from 0°C to
70°C. Specifications over the –40°C to 85°C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
T_J = T_A + (P_D • θ_JA °C/W).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
TYPICAL PERFOR A CE CHARACTERISTICS
Input DC Supply Current in
Shutdown vs Temperature
20 _{FRONT PAGE APPLICATION}
18
16
V_IN = 5.5V
14
V_IN = 4.2V
12
10
V_IN = 3.6V
8
6
V_IN = 2.7V
4
2
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3453 G01
I_SET1,2 Servo Voltage vs V_IN
812 _{TA = 25°C}
R_ISET1,2 = 8.25k
808
804
800
796
792
788
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_IN (V)
3453 G05
Undervoltage Lockout Threshold
vs Temperature
2.2
2.1
V_IN RISING
2.0
1.9
V_IN FALLING
1.8
1.7
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3453 G02
Regulated Maximum V_OUT vs
Temperature
4.55 _{VIN = 3.6V}
4.54 ALL LED PINS OPEN
4.53
4.52
4.51
4.50
4.49
4.48
4.47
4.46
4.45
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3453 G06
I_SET1,2 Servo Voltage vs
Temperature
812 _{VIN = 3.6V}
R_ISET1,2 = 8.25k
808
804
800
796
792
788
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3453 G04
Oscillator Frequency vs
Temperature
1050 _{VOUT = 3V}
1040
V_IN = 5.5V
1030
1020
V_IN = 4.2V
1010
1000
V_IN = 3.6V
990
980
V_IN = 2.7V
970
960
950
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3453 G07
3453fa
3