LTC3118_15 Datasheet, PDF (3/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

LTC3118
Electrical Characteristics The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T_J ≈ T_A = 25°C (Note 2). Unless otherwise noted, V_IN1 or V_IN2 = 5V, V_OUT = 5V.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Voltage Range
Output Operating Voltage
V_IN1 or V_IN2, V_CC ≥ 2.5V
l 2.2
l
2
18
V
18
V
Undervoltage Lockout Threshold on V_CC
Minimum V_IN Start-Up Voltage
Input Quiescent Current in Shutdown
V_CC Rising, V_IN = 2.5V
l 2.2
2.35
2.5
V
V_CC Powered from V_IN1 or V_IN2 (I_VCC = 10mA)
l 2.2
2.5
2.65
V
RUN1 and RUN2 < 0.2V
2
µA
Input Quiescent Current in Burst Mode Operation
Input Quiescent Current in PWM Mode Operation
Output Quiescent Current in Burst Mode Operation
Active V_IN1 or V_IN2, FB = 1.2V
Inactive V_IN1 or V_IN2, FB = 1.2V
Active V_IN1 or V_IN2, FB = 0.8V
50
µA
5
µA
12
mA
1
µA
Oscillator Frequency
l 1000 1200 1400
kHz
Oscillator Frequency Variation
Feedback Voltage
Active V_IN = 3V to 18V
0.1
%/ V
l 0.98
1.0
1.02
V
Feedback Voltage Line Regulation
Error Amplifier Transconductance
Active V_IN = 3V to 18V
VC Current = ±4µA
0.2
%
80
µS
Feedback Pin Input Current
FB = 1V
0
50
nA
VC Source Current
VC = 0.5V, FB = 0.8V
–14
µA
VC Sink Current
VC = 0.5V, FB = 1.2V
14
µA
RUN Pin Threshold: Accurate
RUN1 or RUN2 Rising
l 1.17 1.22 1.27
V
RUN Pin Hysteresis: Accurate
Accurate RUN (Rising – Falling)
170
mV
RUN Pin Logic Threshold for V_CC Enable/Shutdown
RUN Pin Leakage Current
RUN1 or RUN2 = 4V
l 0.2
0.65 1.15
V
0.2
µA
V_CC Output Voltage
V_CC Load Regulation
V_CC Line Regulation
V_CC Current Limit
Average Inductor Current Limit (Note 5)
I_VCC = 1mA
I_VCC = 1mA to 10mA
I_VCC = 1mA, V_IN = 5V to 18V
V_IN > 6V
l 3.5
3.8
4.1
V
–1
%
0.5
%
60
mA
l 3.0
3.6
5.2
A
Overload Current Limit (Note 5)
Reverse Inductor Current Limit (Note 5)
Current from V_IN1 or V_IN2
PWM Mode
6
A
–200
mA
Maximum Duty Cycle
Percentage of Period SW2 Is Low in Boost Mode l 90
95
%
Percentage of Period SW1 Is High in Boost Mode l 83
88
%
Minimum Duty Cycle
Percentage of Period SW1 Is High in Buck Mode
l
0
%
SW1 and SW2 Forced Low Time
BST1 or BST2 Capacitor Charge Time
100
ns
N-Channel Switch Resistance
Switch A1 (From V_IN1 to SW1)
Switch A2 (From V_IN2 to SW1)
Switch B (From SW1 to PGND)
80
mΩ
120
mΩ
80
mΩ
Switch C (From SW2 to PGND)
80
mΩ
N-Channel Switch Leakage
Soft-Start Time
Switch D (From PV_OUT to SW2)
V_IN2, V_IN2 or V_OUT = 18V
80
mΩ
0.1
10
µA
1
ms
MODE and SEL Threshold Voltage
l 0.3
0.75
1.2
V
MODE and SEL Leakage
Pin = 5V
0
0.5
µA
3118f
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