LTC3112_15 Datasheet, PDF (3/32 Pages) Linear Technology – 15V, 2.5A Synchronous Buck-Boost DC/DC Converter

LTC3112
Electrical Characteristics 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.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Range
0°C to 150°C
–55°C to 0°C
2.7
15
V
2.85
15
V
V_IN UVLO Threshold
V_IN UVLO Hysteresis
V_CC UVLO Threshold
V_CC UVLO Hysteresis
Rising
Rising
2.0
2.3
2.7
V
300
mV
l 2.2
2.35
2.5
V
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
OVP Threshold
V_FB = 0.8V
Rising Threshold
0
50
nA
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
NMOS Switch On Resistance
Switch A, B, C, D, V_IN = V_OUT = 12V
Switch A
1
10
µA
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)
Maximum Duty Cycle
SW2 to V_OUT Current = 1.5A
SW2 to V_OUT Current = 1.0A
SW2 to V_OUT Current = 0.5A
Buck (Switch A On)
32
36
40
µA
20
24
28
µA
8
12
16
µA
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.
For more information www.linear.com/LTC3112
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