LTC3835-1 Linear Technology, LTC3835-1 Datasheet - Page 3

• Manufacturer Part Number: LTC3835-1
• Description: Low IQ Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
Main Control Loop
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
Oscillator and Phase-Locked Loop
f
f
f
f
f
I
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.
VFB
Q
SENSE
TRACK/SS
ON(MIN)
NOM
LOW
HIGH
SYNCMIN
SYNCMAX
PLLLPF
m
FB
REFLNREG
LOADREG
OVL
RUN
SENSE(MAX)
INTVCCVIN
LDOVIN
MAX
CC
ON
Linear Regulator
r
f
1D
2D
r
f
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
Nominal Frequency
Lowest Frequency
Highest Frequency
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
Phase Detector Output Current
Sleep Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
Sinking Capability
Sourcing Capability
CC
Load Regulation
CC
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
V
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
8.5V < V
I
V
V
V
PLLIN/MODE = External Clock; V
PLLIN/MODE = External Clock; V
f
f
TH
CC
PLLIN/MODE
PLLIN/MODE
TRACK
IN
RUN
IN
SENSE
RUN1
FB
FB
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
PLLLPF
PLLLPF
PLLLPF
= 1.2V; Sink/Source 5μA (Note 4)
= 0mA to 20mA
= 4V to 30V (Note 4)
Ramping Down
= 0.7V, V
= 0.7V, V
A
= 0V
, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 25°C. V
–
= 0V
= No Connect
= 0V
= INTV
= V
IN
RUN2
TH
< 30V
SENSE
< f
> f
FB
The
SENSE
SENSE
Voltage = 1.2V
Rising
FB
OSC
OSC
= 0.83V (No Load)
CC
Relative to Regulated V
l
+
IN
–
–
= 0V
denotes the specifi cations which apply over the full operating
= 3.3V
= 3.3V
= 12V, V
Note 2: The LTC3835E-1 is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3835I-1 is guaranteed to
meet performance specifi catons over the full –40°C to 85°C operating
temperature range.
TH
TH
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
MIN
0.75
360
220
475
650
0.5
5.0
98
90
80
8
LTC3835-1
0.800
0.002
–660
–0.1
1.55
99.4
5.25
TYP
100
100
180
400
250
530
115
800
3.5
1.0
0.7
0.2
–5
80
10
10
50
50
40
40
70
70
–5
0.1
5
0.808
MAX
0.02
–0.5
1.35
–50
125
110
115
440
280
580
140
0.9
5.5
1.0
20
12
90
90
90
80
0.5
4
UNITS
mmho
38351fc
3
%/V
kHz
kHz
kHz
kHz
kHz
mV
mV
nA
μA
μA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
%
V
V
V
V