Datasheet
LTC3734
3
3734fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
PVCC
= V
SVCC
= 5V, V
RUN/SS
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Input DC Supply Current
Normal Mode
Shutdown
(Note 5)
V
RUN/SS
= 0V
2
20
3
100
mA
µA
UVR Undervoltage RUN/SS Reset V
CC
Lowered Until the RUN/SS Pin is Pulled Low 3.2 3.7 4.2 V
I
RUN/SS
Soft-Start Charge Current V
RUN/SS
= 1.9V –2.3 –1.5 –0.8 µA
V
RUN/SS
RUN/SS Pin ON Threshold V
RUN/SS
Rising 1.0 1.5 1.9 V
V
RUN/SSARM
RUN/SS Pin Latchoff Arming V
RUN/SS
Rising from 3V 3.9 V
V
RUN/SSLO
RUN/SS Pin Latchoff Threshold V
RUN/SS
Ramping Negative 3.2 V
I
SCL
RUN/SS Discharge Current Soft Short Condition V
FB
= 0.375V, V
RUN/SS
= 4.5V –5 –1.5 µA
I
SDLHO
Shutdown Latch Disable Current V
FB
= 0.375V, V
RUN/SS
= 4.5V 1.5 5 µA
I
SENSE
Total Sense Pins Source Current V
SENSE
–
= V
SENSE
+
= 0V –85 –60 µA
DF
MAX
Maximum Duty Factor In Dropout 95 98.5 %
TG t
r
TG t
f
Top Gate Transition Time:
Rise Time
Fall Time
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
30
40
90
90
ns
ns
BG t
r
BG t
f
Bottom Gate Transition Time:
Rise Time
Fall Time
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
60
50
90
90
ns
ns
TG/BG t
1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
C
LOAD
= 3300pF (Note 6) 50 ns
BG/TG t
2D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
C
LOAD
= 3300pF (Note 6) 60 ns
t
ON(MIN)
Minimum On-Time Tested with a Square Wave (Note 7) 100 ns
VID Parameters
R
ATTEN
VID Top Resistance 5.33 kΩ
ATTEN
ERR
Resistive Divider Error (Note 8)
l
–0.25 0.25 %
VID
THLOW
VID0 to VID5 Logic Threshold Low 0.3 V
VID
THHIGH
VID0 to VID5 Logic Threshold High 0.7 V
VID
LEAK
VID0 to VID5 Leakage ±1 µA
Oscillator
I
FREQSET
FREQSET Input Current V
FREQSET
= 0V –2 –1 µA
f
NOM
Nominal Frequency V
FREQSET
= 1.2V 320 355 390 kHz
f
LOW
Lowest Frequency V
FREQSET
= 0V 190 210 240 kHz
f
HIGH
Highest Frequency V
FREQSET
≥ 2.4V 490 550 610 kHz
PGOOD Output
V
PGL
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V ±1 µA
V
PG
PGOOD Trip Level V
FB
with Respect to Set Output Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
–7
7
–10
10
–13
13
%
%
t
MASK
PGOOD Mask Timer 100 110 120 µs
t
DELAY
MCH_PG Delay Time 15 cycles