LTC3129_15 Datasheet, PDF (3/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current

LTC3129
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). Unless otherwise noted, V_IN = 12V, V_OUT = 5V.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V_IN Start-Up Voltage
Input Voltage Range
V_IN UVLO Threshold (Rising)
V_IN UVLO Hysteresis
Output Voltage Adjust Range
V_CC > 2.42V (Back-Driven)
V_CC > 2.42V (Back-Driven)
l
2.25
2.42
V
l 1.92
15
V
l 1.8
1.9
2.0
V
l 80
100
130
mV
l 1.4
15.75
V
Feedback Voltage
l 1.151 1.175 1.199
V
Feedback Input Current
FB = 1.25V
0.1
10
nA
Quiescent Current (V_IN) – Shutdown
Quiescent Current (V_IN) UVLO
RUN = 0V, Including Switch Leakage
Either V_IN or V_CC Below Their UVLO Threshold, or
RUN Below the Threshold to Enable Switching
10
100
nA
1.9
3
µA
Quiescent Current – Burst Mode Operation
N-Channel Switch Leakage on V_IN and V_OUT
Measured on V_IN, FB > 1.25V
PWM = 0V, RUN = V_IN
SW1 = 0V, V_IN = 15V
SW2 = 0V, V_OUT = 15V
RUN = 0V
1.3
2.0
µA
10
50
nA
N-Channel Switch On-Resistance
Inductor Average Current Limit
Inductor Peak Current Limit
V_CC = 4V
V_OUT > UV Threshold (Note 4)
V_OUT < UV Threshold (Note 4)
(Note 4)
0.75
Ω
l 220
275
350
mA
l 80
130
200
mA
l 400
500
680
mA
Maximum Boost Duty Cycle
FB = 1.10V. Percentage of Period SW2 is Low in l 85
89
95
%
Boost Mode (Note 7)
Minimum Duty Cycle
FB = 1.25V. Percentage of Period SW1 is High in l
Buck Mode (Note 7)
0
%
Switching Frequency
SW1 and SW2 Minimum Low Time
PWM = V_CC
(Note 3)
l 1.0
1.2
1.4
MHz
90
ns
MPPC Voltage
l 1.12
1.175
1.22
V
MPPC Input Current
MPPC = 5V
1
10
nA
RUN Threshold to Enable V_CC
RUN Threshold to Enable Switching (Rising)
RUN (Switching) Threshold Hysteresis
V_CC > 2.4V
l 0.5
0.9
1.15
V
l 1.16
1.22
1.28
V
50
80
120
mV
RUN Input Current
RUN = 15V
1
10
nA
PWM Input High
l 1.6
V
PWM Input Low
l
0.5
V
PWM Input Current
PWM = 5V
0.1
1
µA
Soft-Start Time
3
ms
V_CC Voltage
V_CC Dropout Voltage (V_IN – V_CC)
V_CC UVLO Threshold (Rising)
V_CC UVLO Hysteresis
V_CC Current Limit
V_CC Back-Drive Voltage (Maximum)
V_CC Input Current (Back-Driven)
V_CC Leakage to V_IN if V_CC > V_IN
V_OUT UV Threshold (Rising)
V_IN > 4.85V
V_IN = 3.0V, Switching
V_IN = 2.0V (V_CC in UVLO)
V_CC = 0V
V_CC = 5.5V (Switching)
V_CC = 5.5V, V_IN = 1.8V, Measured on V_IN
l 3.4
4.1
4.7
V
35
60
mV
0
2
mV
l 2.1
2.25
2.42
V
60
mV
l
4
20
40
mA
l
5.5
V
2
4
mA
–27
µA
l 0.95
1.15
1.35
V
For more information www.linear.com/LTC3129
3129fb
3