LTC3836 LINER [Linear Technology], LTC3836 Datasheet - Page 3

• Manufacturer Part Number: LTC3836
• Description: Dual 2-Phase, No RSENSETM Low VIN Synchronous Controller
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
Undervoltage Lockout Threshold
Shutdown Threshold at RUN/SS
Start-Up Current Source
Regulated Feedback Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
V
TRACK/SS2 Input Current
Overvoltage Protect Threshold
Overvoltage Protect Hysteresis
Auxiliary Feedback Threshold
Top Gate (TG) Drive 1, 2 Rise Time
Top Gate (TG) Drive 1, 2 Fall Time
Bottom Gate (BG) Drive 1, 2 Rise Time
Bottom Gate (BG) Drive 1, 2 Fall Time
Maximum Current Sense Voltage (ΔV
(SENSE
Maximum Duty Cycle
Soft-Start Time
Oscillator and Phase-Locked Loop
Oscillator Frequency
Phase-Locked Loop Lock Range
Phase Detector Output Current
PGOOD Output
PGOOD Voltage Low
PGOOD Trip Level
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 LTC3836 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.
FB1,2
Sinking
Sourcing
Input Current
+
– SW)
SENSE(MAX)
)
CONDITIONS
V
V
RUN/SS = 0V
–40°C to 85°C (Note 5)
2.75V < V
I
I
(Note 5)
TRACK/SS2 = 0V
Measured at V
SYNC/FCB Ramping Positive
C
C
C
C
IPRG = Floating
IPRG = 0V
IPRG = V
In Dropout
Time for V
Unsynchronized (SYNC/FCB Not Clocked)
f
f
I
V
SYNC/FCB Clocked
TH
TH
OSC
OSC
PGOOD
IN
IN
L
L
L
L
FB
PLLLPF = Floating
PLLLPF = 0V
PLLLPF = V
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
V
V
V
V
= 3000pF
= 3000pF
= 3000pF
= 3000pF
FB
FB
FB
FB
= 0.9V (Note 5)
= 1.7V
Falling
Rising
with Respect to Set Output Voltage
> f
> f
< 0.6V, Ramping Positive
< 0.6V, Ramping Negative
> 0.6V, Ramping Negative
> 0.6V, Ramping Positive
SYNC/FCB
SYNC/FCB
Sinking 1mA
A
IN
IN
FB1
= 25°C. V
< 4.5V (Note 5)
IN
to Ramp from 0.05V to 0.55V
FB
The
l
IN
denotes the specifi cations which apply over the full operating
= 3.3V unless otherwise specifi ed.
Note 3: T
pation P
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The LTC3836 is tested in a feedback loop that servos I
specifi ed voltage and measures the resultant V
Note 6: Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as shown in Figure 1.
D
J
according to the following formula: T
is calculated from the ambient temperature T
l
l
l
l
l
l
l
l
0.591
0.525
MIN
1.95
2.15
0.45
0.66
110
185
480
260
650
850
–13
–16
0.4
0.6
70
10
7
1
–0.12
–10.0
–13.3
FB
1150
2.25
2.45
0.65
0.65
0.05
0.12
0.68
10.0
13.3
J
TYP
122
202
550
300
750
200
140
0.6
1.5
0.6
0.8
10
20
40
40
50
40
82
97
–4
4
= T
voltage.
A
LTC3836
+ (P
A
0.609
0.675
and power dissi-
D
MAX
2.55
2.75
0.85
–0.5
135
220
600
340
825
250
–10
0.2
0.5
2.2
0.7
50
95
–7
13
16
1
1
• θ
TH
JA
°C/W)
to a
UNITS
mV/V
3836fa
3
kHz
kHz
kHz
kHz
kHz
mV
mV
mV
mV
mV
ms
μA
nA
μA
μA
μA
ns
ns
ns
ns
%
%
%
%
%
%
%
V
V
V
V
V
V