Datasheet

LTC3822-1
3
38221f
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3822E-1 is guaranteed to meet specifi ed performance
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating range
are assured by design characterization, and correlation with statistical
process controls.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Load Regulation I
TH
= 1.3V to 0.9V (Note 5)
I
TH
= 1.3V to 1.7V
0.1
–0.1
0.5
–0.5
%
%
TRACK/SS Pull-Up Current TRACK/SS = 0V 0.65 1 1.35 µA
V
FB
Input Current (Note 5) 10 50 nA
Overvoltage Protect Threshold Measured at V
FB
0.66 0.68 0.70 V
Overvoltage Protect Hysteresis 20 mV
Top Gate (TG) Drive Rise Time C
L
= 3000pF 40 ns
Top Gate (TG) Drive Fall Time C
L
= 3000pF 40 ns
Bottom Gate (BG) Drive Rise Time C
L
= 3000pF 50 ns
Bottom Gate (BG) Drive Fall Time C
L
= 3000pF 40 ns
Maximum Duty Cycle In Dropout 99 %
Maximum Current Sense Voltage (V
IN
– SW)
(ΔV
SENSE(MAX)
)
IPRG = Floating
IPRG = 0V
IPRG = V
IN
●
●
●
110
70
185
125
82
200
140
95
220
mV
mV
mV
Soft-Start Time Time for V
FB
to Ramp from 0.05V to 0.55V 650 µs
Oscillator
Oscillator Frequency PLLLPF = Floating
PLLLPF = 0V
PLLLPF = V
IN
480
240
640
550
300
750
600
340
850
kHz
kHz
kHz
Phase-Locked Loop Lock Range SYNC/MODE Clocked
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency 750
200
1000
250 kHz
kHz
Phase detector Output Current
Sinking
Sourcing
f
OSC
> f
SYNC/MODE
f
OSC
< f
SYNC/MODE
–5
5
µA
µA
PGOOD Output (GN Package Only)
PGOOD Voltage Low I
PGOOD
Sinking 1mA 100 mV
PGOOD Trip Level V
FB
with Respect to Set Output Voltage
V
FB
< 0.6V, Ramping Postive
V
FB
< 0.6V, Ramping Negative
V
FB
> 0.6V, Ramping Negative
V
FB
> 0.6V, Ramping Positive
–13
–16
7
10
–10.0
–13.3
10.0
13.3
–7
–10
13
16
%
%
%
%
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V unless otherwise noted.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
)
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The LTC3822-1 is tested in a feedback loop that servos I
TH
to a
specifi ed voltage and measures the resultant V
FB
voltage.