LTC3834 Linear Technology, LTC3834 Datasheet - Page 3

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LTC3834

Manufacturer Part Number
LTC3834
Description
Synchronous Step-Down Controller
Manufacturer
Linear Technology
Datasheet

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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
TG t
TG t
BG t
BG 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
VFB
Q
SENSE
TRACK/SS
ON(MIN)
NOM
LOW
HIGH
SYNCMIN
SYNCMAX
PLLLPF
FB
REFLNREG
LOADREG
m
OVL
RUN
SENSE(MAX)
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
MAX
r
f
r
f
CC
ON
1D
2D
Linear Regulator
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifi er g
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
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
Phase Detector Output Current
Sleep Mode
Shutdown
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
m
CONDITIONS
(Note 4); I
(Note 4)
V
(Note 4)
Measured in Servo Loop; ΔI
Measured in Servo Loop; ΔI
I
(Note 5)
RUN = 5V, V
V
V
Measured at V
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
f
f
TH
CC
CC
PLLIN/MODE
PLLIN/MODE
TRACK
IN
RUN
IN
SENSE
RUN
FB
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
EXTVCC
PLLLPF
PLLLPF
PLLLPF
= 1.2V; Sink/Source 5μA (Note 4)
= 0mA to 20mA, V
= 0mA to 20mA, V
= 4V to 30V (Note 4)
Ramping Down
= 0.7V, V
A
CC
= 0V
Rising
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 25°C. V
= 0V
Ramping Positive
= No Connect
= 0V
= INTV
= V
IN
= 8.5V
TH
< 30V, V
SENSE
FB
< f
> f
The
SENSE
Voltage = 1.2V
FB
OSC
OSC
= 0.83V (No Load)
CC
Relative to Regulated V
+
l
IN
= 0V
EXTVCC
= 3.3V
denotes the specifi cations which apply over the full operating
= 12V, V
EXTVCC
EXTVCC
= 0V
TH
TH
= 0V
= 8.5V
RUN
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
PLLLPF
PLLLPF
= 5V unless otherwise noted.
= 0V
= 2V
FB
l
l
l
l
l
0.792
0.85
MIN
360
220
475
650
0.5
7.2
4.5
98
85
8
5
0.800
0.002
–220
–0.1
99.4
5.25
TYP
100
200
400
250
530
115
800
0.5
3.7
1.1
0.7
0.2
7.5
0.2
4.7
0.2
–5
30
10
50
50
40
40
70
70
–5
0.1
4
5
LTC3834
0.808
MAX
0.02
–0.5
1.45
–50
115
440
280
580
140
0.9
5.5
1.0
7.8
1.0
50
10
12
90
90
90
80
0.5
4
UNITS
mmho
3834fb
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

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