ltc3827ig-1 Linear Technology Corporation, ltc3827ig-1 Datasheet - Page 3

• Manufacturer Part Number: ltc3827ig-1
• Description: Low Iq, Dual, 2-phase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
SYMBOL
I
UVLO
V
I
DF
I
V
V
TG1, 2 t
TG1, 2 t
BG1, 2 t
BG1, 2 t
TG/BG t
BG/TG t
t
INTV
V
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
f
f
I
PGOOD Output
V
I
V
temperature range, otherwise specifications are at T
Q
SENSE
TRACK/SS1, 2
ON(MIN)
NOM
LOW
HIGH
SYNCMIN
SYNCMAX
PGOOD
PLLLPF
OVL
RUN1, 2
SENSE(MAX)
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
PGL
PG
MAX
CC
1D
2D
Linear Regulator
r
f
r
f
ON
PARAMETER
Input DC Supply Current
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Maximum Duty Factor
Soft-Start Charge Current
RUN Pin ON Threshold
Maximum Current Sense Threshold
TG Transition Time:
BG Transition Time:
Top Gate Off to Bottom Gate On Delay C
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay C
Top Switch-On Delay Time
Minimum On-Time
Internal V
INTV
Internal V
INTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
Minimum Synchronizable Frequency PLLIN/MODE = External Clock; V
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; V
Phase Detector Output Current
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
Sleep Mode (Channel 1 On)
Sleep Mode (Channel 2 On)
Shutdown
Sleep Mode (Both Channels)
Rise Time
Fall Time
Rise Time
Fall Time
Sinking Capability
Sourcing Capability
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
CONDITIONS
(Note 5)
RUN1 = 5V, RUN2 = 0V, V
RUN1 = OV, RUN2 = 5V, V
V
RUN1,2 = 5V, V
V
Measured at V
(Each Channel) V
In Dropout
V
V
V
V
(Note 6)
C
C
(Note 6)
C
C
(Note 7)
8.5V < V
I
V
I
I
V
V
V
f
f
I
V
V
CC
CC
CC
PLLIN/MODE
PLLIN/MODE
PGOOD
RUN1, 2
IN
TRACK1, 2
RUN1,
FB1, 2
FB1, 2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
EXTVCC
PLLLPF
PLLLPF
PLLLPF
PGOOD
FB
V
V
FB
FB
= 0mA to 20mA, V
= 0mA to 20mA, V
= 20mA, EXTV
Ramping Down
with Respect to Set Regulated Voltage
Ramping Negative
Ramping Positive
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
V
= 0.7V,V
= 0.7V,V
A
= 2mA
= Floating; PLLIN/MODE = DC Voltage
= 0V; PLLIN/MODE = DC Voltage
= INTV
= 5V
RUN2
IN
= 8.5V
= 0V
= 25°C. V
< 30V, V
= 0V
< f
> f
The
Rising
FB1, 2
OSC
OSC
CC
SENSE1 – , 2 –
SENSE1 – , 2 –
FB1
SENSE1
; PLLIN/MODE = DC Voltage
CC
●
= V
, Relative to Regulated V
EXTVCC
IN
Ramping Positive
denotes the specifications which apply over the full operating
EXTVCC
EXTVCC
FB2
= 12V, V
–
, 2
FB1
= 0.83V
FB2
= 0V
= 3.3V
= 3.3V
– = V
= 0V
= 8.5V
= 0.83V (No Load)
= 0.83V (No Load)
SENSE1
RUN/SS1, 2
PLLLPF
PLLLPF
+
= 0V
= 2V
, 2
+ = 0V
FB1, 2
= 5V unless otherwise noted.
●
●
0.75
MIN
360
220
475
650
–12
0.5
5.0
7.2
4.5
98
90
80
8
8
LTC3827-1
– 660
99.4
5.25
TYP
–10
115
100
100
180
400
250
530
115
800
3.5
1.0
0.7
0.2
7.5
0.2
4.7
0.2
0.1
50
50
40
40
70
70
80
80
10
–5
8
10
5
MAX
1.35
125
125
160
110
115
440
280
580
140
0.9
5.5
1.0
7.8
1.0
0.3
– 8
20
12
90
90
90
80
±1
12
4
UNITS
38271fd
3
kHz
kHz
kHz
kHz
kHz
mV
mV
μA
μA
μA
μA
μA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
%
%
V
V
V
V
V
V
V