Datasheet

LTC3112
3
3112fc
For more information www.linear.com/LTC3112
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= V
OUT
= PWM/SYNC = RUN = 5V unless otherwise noted.
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Operating Range 0°C to 150°C
–55°C to 0°C
2.7
2.85
15
15
V
V
V
IN
UVLO Threshold Rising 2.0 2.3 2.7 V
V
IN
UVLO Hysteresis 300 mV
V
CC
UVLO Threshold Rising
l
2.2 2.35 2.5 V
V
CC
UVLO Hysteresis 150 mV
Output Voltage Adjust Range
l
2.5 14 V
INTV
CC
Clamp Voltage V
IN
= 5V or 15V
l
3.8 4.2 4.6 V
V
CC
Voltage in Dropout V
IN
= 2.7V, I
VCC
= 10mA 2.6 V
Quiescent Current – Burst Mode Operation V
FB
= 1V, V
PWM/SYNC
= 0V 50 75 µA
Quiescent Current – Shutdown RUN = V
OUT
= V
CC
= 0V, Not Including Switch Leakage 0 1 µA
Feedback Voltage = PWM Mode Operation
l
0.778 0.8 0.818 V
Feedback Leakage V
FB
= 0.8V 0 50 nA
OVP Threshold Rising Threshold 0.78 0.83 0.88 V
OVP Hysteresis Measured at OVP Pin 20 mV
OVP Leakage OVP = 0.8V 0 100 nA
NMOS Switch Leakage Switch A, B, C, D, V
IN
= V
OUT
= 12V 1 10 µA
NMOS Switch On Resistance Switch A 40 mΩ
NMOS Switch On Resistance Switch B, C 50 mΩ
NMOS Switch On Resistance Switch D 60 mΩ
Input Current Limit L = 4.7µH
l
4.5 6 8.5 A
Peak Current Limit L = 4.7µH 7 10 12 A
Burst Current Limit L = 4.7µH 0.7 1.3 2 A
Burst Zero Current Threshold L = 4.7µH 0.3 A
Reverse Current Limit L = 4.7µH –0.5 –1 –1.5 A
I
OUT
Accuracy (Note 5) SW2 to V
OUT
Current = 1.5A
SW2 to V
OUT
Current = 1.0A
SW2 to V
OUT
Current = 0.5A
32
20
8
36
24
12
40
28
16
µA
µA
µA
Maximum Duty Cycle Buck (Switch A On)
l
80 87 %
Boost (Switch C On)
l
75 82 %
Minimum Duty Cycle Buck (Switch A On)
l
0 %
Boost (Switch C On)
l
5 12 %
Frequency PWM/SYNC = 5V, V
IN
= V
OUT
= 12V
l
675 750 825 kHz
SYNC Frequency Range (Note 7)
l
300 1500 kHz
PWM/SYNC Threshold V
CC
= 2.7V or 5V
l
0.5 0.9 1.5 V
RUN Threshold V
IN
= 2.7V or 15V
l
0.35 0.75 1.5 V
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 LTC3112 is tested under pulsed load conditions such that T
J
≈ T
A
.
The LTC3112E is guaranteed to meet specifications from 0°C to 85°C junction
temperature. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation with
statistical process controls. The LTC3112I is guaranteed to meet specifications
over the –40°C to 125°C operating junction temperature, the LTC3112H is
guaranteed to meet specifications over the –40°C to 150°C operating junction
temperature range and the LTC3112MP is guaranteed and tested to meet
specifications over
the full
–55°C to 150°C operating junction temperature
range. High junction temperatures degrade operating lifetimes; operating
lifetime is derated for temperature greater than 125°C. Note that the maximum
ambient temperature consistent with these specifications is determined by
specific operating conditions in conjunction with board layout, the rated
package thermal impedance and other environmental factors.