LTC3826 Linear Technology, LTC3826 Datasheet - Page 3

• Manufacturer Part Number: LTC3826
• Description: 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
Main Control Loops
V
I
V
V
g
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
VFB1, 2
Q
SENSE
TRACK/SS1, 2
ON(MIN)
NOM
LOW
HIGH
SYNCMIN
SYNCMAX
FB1, 2
REFLNREG
LOADREG
m1, 2
OVL
RUN1, 2
SENSE(MAX)
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
MAX
CC
1D
2D
Linear Regulator
r
f
r
f
ON RUN Pin ON Threshold
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifi er g
Input DC Supply Current
Sleep Mode (Channel 1 On)
Sleep Mode (Channel 2 On)
Shutdown
Sleep Mode (Both Channels)
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Maximum Duty Factor
Soft-Start Charge Current
Maximum Current Sense Threshold
TG Transition Time:
BG Transition Time:
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay
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
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; V
Rise Time
Fall Time
Rise Time
Fall Time
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
m
CONDITIONS
(Note 4); I
(Note 4)
V
(Note 4)
Measured in Servo Loop; ΔI
Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V
I
(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
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
8.5V < V
I
V
I
EXTV
V
V
V
PLLIN/MODE = External Clock; V
TH1, 2
CC
CC
TRACK1, 2
IN
RUN1, 2
IN
RUN1
FB1, 2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
EXTVCC
PLLLPF
PLLLPF
PLLLPF
= 0mA to 20mA, V
= 0mA to 20mA, V
= 4V to 30V (Note 4)
Ramping Down
CC
A
, V
= 1.2V; Sink/Source 5mA (Note 4)
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
= 0.7V, V
= 25°C. V
Ramping Positive
= Floating; PLLIN/MODE = DC Voltage
= 0V; PLLIN/MODE = DC Voltage
= INTV
IN
= 8.5V
= 0V
RUN2
TH1, 2
= 0V
< 30V, V
The
Rising
FB1, 2
CC
FB1
SENSE1
Voltage = 1.2V
SENSE1
; PLLIN/MODE = DC Voltage
l
IN
= V
EXTVCC
, Relative to Regulated V
denotes the specifi cations which apply over the full operating
= 12V, V
EXTVCC
EXTVCC
FB2
–,
–,
2
FB1
FB2
= 0.83V
– = 3.3V
2
= 0V
– = V
TH
= 0.83V (No Load)
= 0V
= 8.5V
= 0.83V (No Load)
RUN/SS1, 2
Voltage = 1.2V to 0.7V
SENSE1
PLLLPF
PLLLPF
+,
= 0V
= 2V
2
= 5V unless otherwise noted.
+ = 0V
FB1, 2
l
l
l
l
l
0.792
0.75
MIN
350
220
475
650
0.5
5.0
7.2
4.5
98
85
8
0.800
0.002
–0.1
–220
99.4
5.25
TYP
100
230
390
250
530
115
800
0.5
3.7
0.7
0.2
7.5
0.2
4.7
0.2
–5
30
30
50
10
50
50
40
40
70
70
0.1
4
1
LTC3826
0.808
MAX
0.02
–0.5
1.35
–50
115
430
280
585
140
0.9
1.0
7.8
1.0
5.5
50
50
10
75
12
90
90
90
80
0.5
4
UNITS
mmho
3826fc
3
%/V
kHz
kHz
kHz
kHz
kHz
mV
nA
μA
μA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
%
%
V
V
V
V
V
V
V