Datasheet

LTC3129-1
3
31291fa
For more information www.linear.com/LTC3129-1
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
l
2.25 2.42 V
Input Voltage Range V
CC
> 2.42V (Back-Driven)
l
1.92 15 V
V
IN
UVLO Threshold (Rising) V
CC
> 2.42V (Back-Driven)
l
1.8 1.9 2.0 V
V
IN
UVLO Hysteresis
l
80 100 130 mV
V
OUT
Voltages VS1 = VS2 = VS3 = 0V
VS1 = V
CC
, VS2 = VS3 = 0V
VS2 = V
CC
, VS1 = VS3 = 0V
VS1 = VS2 = V
CC
, VS3 = 0V
VS1 = VS2 = 0V, VS3 = V
CC
VS2 = 0V, VS1 = VS3 = V
CC
VS1 = 0V, VS2 = VS3 = V
CC
VS1 = VS2 = VS3 = V
CC
l
l
l
l
l
l
l
l
2.425
3.2175
3.998
4.875
6.727
7.995
11.64
14.50
2.5
3.3
4.1
5.0
6.9
8.2
12
15.0
2.575
3.383
4.203
5.125
7.073
8.405
12.40
15.50
V
V
V
V
V
V
V
V
Quiescent
Current (V
IN
) – Shutdown RUN = 0V, Including Switch Leakage 10 100 nA
Quiescent Current (V
IN
) UVLO Either V
IN
or V
CC
Below Their UVLO Threshold, or
RUN Below the Threshold to Enable Switching
1.9 3 µA
Quiescent Current – Burst Mode Operation Measured on V
IN
, V
OUT
> V
REG
PWM = 0V, RUN = V
IN
1.3 2.0 µA
N-Channel Switch Leakage on V
IN
and V
OUT
SW1 = 0V, V
IN
= 15V
SW2 = 0V, V
OUT
= 15V
RUN = 0V
10 50 nA
N-Channel Switch On-Resistance V
CC
= 4V 0.75 Ω
Inductor Average Current Limit V
OUT
> UV Threshold (Note 4)
V
OUT
< UV Threshold (Note 4)
l
l
220
80
275
130
350
200
mA
mA
Inductor Peak Current Limit (Note 4)
l
400 500 680 mA
Maximum Boost Duty Cycle V
OUT
< V
REG
as Set by VS1-VS3. Percentage of
Period SW2 is Low in Boost Mode (Note 7)
l
85 89 95 %
Minimum Duty Cycle V
OUT
> V
REG
as Set by VS1-VS3. Percentage of
Period SW1 is High in Buck Mode (Note 7)
l
0 %
Switching Frequency PWM = V
CC
l
1.0 1.2 1.4 MHz
SW1 and SW2 Minimum Low Time (Note 3) 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
l
0.5 0.9 1.15 V
RUN Threshold to Enable Switching (Rising) V
CC
> 2.4V
l
1.16 1.22 1.28 V
RUN (Switching) Threshold Hysteresis 50 80 120 mV
RUN Input Current RUN = 15V 1 10 nA
VS1, VS2, VS3 Input High
l
1.2 V
VS1, VS2, VS3 Input Low
l
0.4 V
VS1, VS2, VS3 Input Current VS1, VS2, VS3 = V
CC
= 5V 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
IN
> 4.85V
l
3.4 4.1 4.7 V
V
CC
Dropout Voltage (V
IN
– V
CC
) V
IN
= 3.0V, Switching
V
IN
= 2.0V (V
CC
in UVLO)
35
0
60
2
mV
mV