LTC3115-2_15 Datasheet, PDF (3/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter

LTC3115-2
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are for T_A = 25°C (Note 2). PV_IN = V_IN = 24V, PV_OUT = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Voltage
l 2.7
40
V
Output Operating Voltage
l 2.7
40
V
Input Undervoltage Lockout Threshold
Input Undervoltage Lockout Hysteresis
V_IN Falling
V_IN Rising
V_IN Rising (0°C to 125°C)
l
2.4 2.7
V
l
2.6 2.8
V
2.725
V
100
mV
V_CC Undervoltage Lockout Threshold
V_CC Undervoltage Lockout Hysteresis
Input Current in Shutdown
Input Quiescent Current in Burst Mode Operation
Oscillator Frequency
Oscillator Operating Frequency
PWM/SYNC Clock Input Frequency
V_CC Falling
V_RUN = 0V
V_FB = 1.1V (Not Switching), V_PWM/SYNC = Low
R_T = 35.7k, V_PWM/SYNC = High
V_PWM/SYNC = High
l
2.4 2.6
V
200
mV
3
10
µA
50
µA
l 900 1000 1100
kHz
l 100
2000
kHz
l 100
2000
kHz
PWM/SYNC Input Logic Threshold
l 0.5 1.0 1.5
V
Soft-Start Duration
9
ms
Feedback Voltage
l 977 1000 1017
mV
Feedback Voltage Line Regulation
Feedback Pin Input Current
V_IN = 2.7V to 40V
0.1
%
1
50
nA
RUN Pin Input Logic Threshold
l 0.3 0.8 1.1
V
RUN Pin Comparator Threshold
RUN Pin Hysteresis Current
V_RUN Rising
l 1.16 1.21 1.26
V
500
nA
RUN Pin Hysteresis Voltage
100
mV
Inductor Current Limit
(Note 3)
l 2.4 3.0 3.7
A
Reverse Inductor Current Limit
Burst Mode Inductor Current Limit
Current into PV_OUT (Note 3)
(Note 3)
1.5
A
0.65 1.0 1.35
A
Maximum Duty Cycle
Minimum Duty Cycle
SW1, SW2 Minimum Low Time
N-Channel Switch Resistance
N-Channel Switch Leakage
PV_CC/V_CC External Forcing Voltage
V_CC Regulation Voltage
V_CC Load Regulation
V_CC Line Regulation
V_CC Current Limit
V_CC Dropout Voltage
V_CC Reverse Current
Percentage of Period SW2 is Low in Boost Mode,
R_T = 35.7k (Note 5)
Percentage of Period SW1 is High in Buck Mode,
R_T = 35.7k (Note 5)
R_T = 35.7k (Note 5)
Switch A (From PV_IN to SW1)
Switch B (From SW1 to PGND)
Switch C (From SW2 to PGND)
Switch D (From PV_OUT to SW2)
PV_IN = PV_OUT = 40V
I_VCC = 1mA
I_VCC = 1mA to 20mA
I_VCC = 1mA, V_IN = 5V to 40V
V_CC = 2.5V
I_VCC = 5mA, V_IN = 2.7V
V_CC = 5V, V_IN = 3.6V
l 90
95
%
l
0
%
100
ns
150
mΩ
150
mΩ
150
mΩ
150
mΩ
0.1
10
µA
4.58
5.5
V
4.33 4.45 4.58
V
1.2
%
0.5
%
50 110
mA
50
mV
10
µA
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 LTC3115-2 is tested under pulsed load conditions such
that T_J ≈ T_A. The LTC3115E-2 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 ensured by design,
characterization and correlation with statistical process controls. The
LTC3115I-2 specifications are guaranteed over the –40°C to 125°C
operating junction temperature range. The LTC3115H-2 specifications are
guaranteed over the –40°C to 150°C operating junction temperature range.
The LTC3115MP-2 specifications are guaranteed over the –55°C to 150°C
operating junction temperature range. High junction temperatures degrade
31152fa
For more information www.linear.com/LTC3115-2
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