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LTC3453 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3453
Description  Synchronous Buck-Boost High Power White LED Driver
PDF  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3453 Datasheet(HTML) 3 Page - Linear Technology

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LTC3453
3
3453fa
VIN (V)
2.7
812
808
804
800
796
792
788
3.9
4.3
4.7
5.1
3.5
3453 G05
3.1
5.5
TA = 25°C
RISET1,2 = 8.25k
TEMPERATURE (
°C)
–55
4.55
4.54
4.53
4.52
4.45
4.51
4.50
4.49
4.48
4.47
4.46
45
65
85 105
25
3453 G06
–35 –15
5
125
VIN = 3.6V
ALL LED PINS OPEN
TEMPERATURE (
°C)
–55
20
18
16
14
0
12
10
8
6
4
2
45
65
85 105
25
3453 G01
–35 –15
5
125
VIN = 5.5V
FRONT PAGE APPLICATION
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
TEMPERATURE (
°C)
–55
2.2
2.1
2.0
1.9
1.7
1.8
45
65
85 105
25
3453 G02
–35 –15
5
125
VIN RISING
VIN FALLING
TYPICAL PERFOR A CE CHARACTERISTICS
Input DC Supply Current in
Shutdown vs Temperature
Undervoltage Lockout Threshold
vs Temperature
ISET1,2 Servo Voltage vs VIN
Regulated Maximum VOUT vs
Temperature
TEMPERATURE (
°C)
–55
812
808
804
800
796
792
788
45
65
85 105
25
3453 G04
–35 –15
5
125
VIN = 3.6V
RISET1,2 = 8.25k
ISET1,2 Servo Voltage vs
Temperature
Oscillator Frequency vs
Temperature
TEMPERATURE (
°C)
–55
1050
1040
1030
1020
950
1010
1000
990
980
970
960
45
65
85 105
25
3453 G07
–35 –15
5
125
VIN = 5.5V
VOUT = 3V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
PMOS Switch Leakage
Switches A and D
●
1
µA
NMOS Switch Leakage
Switches B and C
●
1
µA
Oscillator Frequency
0.9
1
1.1
MHz
Soft-Start Time
0.65
ms
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = VOUT = 3.6V unless otherwise noted. (Note 2)
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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA °C/W).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.



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