LTC3452 Linear Technology, LTC3452 Datasheet - Page 3

• Manufacturer Part Number: LTC3452
• Description: Synchronous Buck-Boost MAIN/CAMERA White LED Driver
• Manufacturer: Linear Technology

The
V
PARAMETER
LED
(Note 6)
LED
LED
Regulated Maximum V
PMOS Switch R
NMOS Switch R
Forward Current Limit
Reverse Current Limit
PMOS Switch Leakage
NMOS Switch Leakage
Oscillator Frequency
Soft-Start Time
ELECTRICAL CHARACTERISTICS
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 LTC3452E 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.
IN
Lx
Lx
Lx
= PV
●
Output Current Ratio (I
Output Current Matching
Pin Voltage
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
IN
= V
OUT
ON
ON
= 3.6V unless otherwise specified. (Note 2)
OUT
LEDLx
/I
SETL
)
CONDITIONS
I
PWM Duty Cycle = 6%
PWM Duty Cycle = 19%
PWM Duty Cycle = 31%
PWM Duty Cycle = 44%
PWM Duty Cycle = 56%
PWM Duty Cycle = 69%
PWM Duty Cycle = 81%
PWM Duty Cycle = 94%
(Max – Min)/[(Max + Min)/2] • 100%, I
V
I
V
Switches A and D at 100mA
Switches B and C at 100mA
Switch A
Switch D
Switches A and D
Switches B and C
LEDLx|MAX
LEDLx
LEDLx
LEDLx
= 20mA
= 300mV
= V
LEDHy
= 20mA, V
= 0V
LEDLx
= 300mV
Note 3: T
dissipation P
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: Do not exceed 50kHz PWM frequency in the application.
Note 6: This parameter is tested in a setup which forces conditions
equivalent to those programmed by the indicated duty cycle.
T
J
= T
LEDLx
J
A
is calculated from the ambient temperature T
+ (P
D
= 20mA,
according to the following formula:
D
• θ
JA
°C/W).
●
●
●
●
●
●
●
●
●
117.12
114.56
234.24
229.12
14.72
14.32
29.44
28.64
58.88
57.92
1000
MIN
1.75
3.66
3.56
7.32
7.12
4.35
1.8
0.9
–1
–1
www.DataSheet4U.com
1600
TYP
128
128
256
245
130
210
205
200
650
2.5
4.5
16
16
32
32
64
64
2
2
4
4
8
8
1
A
= 25°C.
LTC3452
A
272.64
17.04
17.44
33.92
34.56
68.16
134.4
137.6
268.8
2400
MAX
2.16
2.21
4.28
4.38
8.56
8.76
67.2
4.75
and power
1.1
8
1
1
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
UNITS
3
MHz
3452f
mΩ
mΩ
mV
mA
mA
µA
µA
µs
%
V