Datasheet

LTC3736-2
3
37362fb
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loops
Input DC Supply Current
Normal Mode
Shutdown
UVLO
(Note 4)
RUN/SS = V
IN
RUN/SS = 0V
V
IN
= UVLO Threshold –200mV
4.75
9
3
750
20
10
μA
μA
μA
Undervoltage Lockout Threshold V
IN
Falling
V
IN
Rising
l
l
1.95
2.15
2.25
2.45
2.55
2.75
V
V
Shutdown Threshold at RUN/SS 0.45 0.65 0.85 V
Start-Up Current Source RUN/SS = 0V 0.4 0.7 1 μA
Regulated Feedback Voltage 0°C to 85°C (Note 5)
–40°C to 85°C
l
0.594
0.591
0.6
0.6
0.606
0.609
V
V
Output Voltage Line Regulation 2.75V < V
IN
< 9.8V (Note 5) 0.05 0.2 mV/ V
Output Voltage Load Regulation I
TH
= 0.9V (Note 5)
I
TH
= 1.7V
0.12
–0.12
0.5
–0.5
%
%
V
FB1,2
Input Current (Note 5) 10 50 nA
TRACK Input Current TRACK = 0.6V 10 50 nA
Overvoltage Protect Threshold Measured at V
FB
0.66 0.68 0.7 V
Overvoltage Protect Hysteresis 20 mV
Auxiliary Feedback Threshold SYNC/FCB Ramping Positive 0.525 0.6 0.675 V
Top Gate (TG) Drive 1, 2 Rise Time C
L
= 3000pF 40 ns
Top Gate (TG) Drive 1, 2 Fall Time C
L
= 3000pF 40 ns
Bottom Gate (BG) Drive 1, 2 Rise Time C
L
= 3000pF 50 ns
Bottom Gate (BG) Drive 1, 2 Fall Time C
L
= 3000pF 40 ns
Maximum Current Sense Voltage (ΔV
SENSE(MAX)
)
(SENSE
+
– SW)
IPRG = Floating
IPRG = 0V
IPRG = V
IN
l
l
l
220
150
320
240
167
345
260
185
370
mV
mV
mV
Soft-Start Time Time for V
FB1
to Ramp from 0.05V to 0.55V 0.667 0.833 1 ms
Oscillator and Phase-Locked Loop
Oscillator Frequency Unsynchronized (SYNC/FCB Not Clocked)
PLLLPF = Floating
PLLLPF = 0V
PLLLPF = V
IN
480
260
650
550
300
750
600
340
825
kHz
kHz
kHz
Phase-Locked Loop Lock Range SYNC/FCB Clocked
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
l
l
850
200
1150
250 kHz
kHz
Phase Detector Output Current
Sinking
Sourcing
f
OSC
> f
SYNC/FCB
f
OSC
< f
SYNC/FCB
–4
4
μA
μA
PGOOD Output
PGOOD Voltage Low I
PGOOD
Sinking 1mA 125 mV
PGOOD Trip Level V
FB
with Respect to Set Output Voltage
V
FB
< 0.6V, Ramping Positive
V
FB
< 0.6V, Ramping Negative
V
FB
< 0.6V, Ramping Negative
V
FB
< 0.6V, Ramping Positive
–13
–16
7
10
–10
–13.3
10
13.3
–7
–10
13
16
%
%
%
%
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 4.2V unless otherwise specifi ed.