Top Side Driver Voltage (BOOST) ..............42V to – 0.3V
Switch Voltage (SW) ....................................36V to – 5V
INTV
CC,
(BOOST-SW).................................8.5V to – 0.3V
RUN, TRACK/SS ......................................... 7V to – 0.3V
SENSE
+
, SENSE
–
Voltages .........................11V to – 0.3V
PLLIN/MODE, PLLLPF ......................... INTV
CC
to – 0.3V
I
TH,
V
FB
Voltages .......................................2.7V to – 0.3V
PI CO FIGURATIO
TOP VIEW
PLLLPF
I
TH
TRACK/SS
V
FB
SGND
PGND
BG
INTV
CC
1
2
3
4
5
6
7
8
17
16 PLLIN/MODE
15 SENSE
+
14 SENSE
–
13 RUN
12 BOOST
11 TG
10 SW
9
V
IN
DHC PACKAGE
16-Pin (5mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43.5°C/W
EXPOSED PAD (PIN 17) IS SGND
MUST BE SOLDERED TO PCB
ORDER I FOR ATIO
LEAD FREE FINISH
LTC3834EDHC-1#PBF
LTC3834IDHC-1#PBF
LTC3834EGN-1#PBF
LTC3834IGN-1#PBF
TAPE AND REEL
LTC3834EDHC-1#TRPBF
LTC3834IDHC-1#TRPBF
LTC3834EGN-1#TRPBF
LTC3834IGN-1#TRPBF
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN
= 5V unless otherwise noted.
SYMBOL
V
FB
I
VFB
V
REFLNREG
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
CONDITIONS
(Note 4); I
TH
Voltage = 1.2V
(Note 4)
V
IN
= 4V to 30V (Note 4)
●
ELECTRICAL CHARACTERISTICS
Main Control Loop
0.792
0.800
–5
0.002
0.808
– 50
0.02
V
nA
%/V
38341f
2
U
U
W W
U
W
W
U
U
U
TOP VIEW
PLLLPF
I
TH
TRACK/SS
V
FB
SGND
PGND
BG
INTV
CC
1
2
3
4
5
6
7
8
16 PLLIN/MODE
15 SENSE
+
14 SENSE
–
13 RUN
12 BOOST
11 TG
10 SW
9
V
IN
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 90°C/W
PART MARKING*
38341
38341
38341
38341
PACKAGE DESCRIPTION
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead Plastic SSOP
16-Lead Plastic SSOP
TEMPERATURE RANGE
–40°C to 85°C (Note 2)
–40°C to 85°C
–40°C to 85°C (Note 2)
–40°C to 85°C
MIN
TYP
MAX
UNITS
LTC3834-1
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN
= 5V unless otherwise noted.
SYMBOL
V
LOADREG
PARAMETER
Output Voltage Load Regulation
CONDITIONS
(Note 4)
Measured in Servo Loop; I
TH
Voltage = 1.2V to 0.7V
Measured in Servo Loop; I
TH
Voltage = 1.2V to 2V
I
TH
= 1.2V; Sink/Source 5μA (Note 4)
(Note 5)
RUN = 5V, V
FB
= 0.83V (No Load)
V
RUN
= 0V
V
IN
Ramping Down
Measured at V
FB
Relative to Regulated V
FB
V
SENSE
– = V
SENSE
+ = 0V
In Dropout
V
TRACK
= 0V
V
RUN1,
V
RUN2
Rising
V
FB
= 0.7V, V
SENSE–
= 3.3V
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
●
●
●
●
ELECTRICAL CHARACTERISTICS
MIN
TYP
0.1
– 0.1
0.5
30
4
3.7
MAX
0.5
– 0.5
UNITS
%
%
mmho
g
m
I
Q
Transconductance Amplifier g
m
Input DC Supply Current
Sleep Mode
Shutdown
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:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
50
10
4
12
μA
μA
V
%
μA
%
UVLO
V
OVL
I
SENSE
DF
MAX
I
TRACK/SS
V
RUN
ON
V
SENSE(MAX)
TG1, 2 t
r
TG1, 2 t
f
BG1, 2 t
r
BG1, 2 t
f
TG/BG t
1D
BG/TG t
2D
t
ON(MIN)
V
INTVCCVIN
V
LDOVIN
f
NOM
f
LOW
f
HIGH
f
SYNCMIN
f
SYNCMAX
I
PLLLPF
8
98
0.85
0.5
85
10
–220
99.4
1.1
0.7
100
50
50
40
40
70
70
200
1.45
0.9
115
90
90
90
80
μA
V
mV
ns
ns
ns
ns
ns
ns
ns
Top Gate Off to Bottom Gate On Delay C
LOAD
= 3300pF
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay C
LOAD
= 3300pF
Top Switch-On Delay Time
Minimum On-Time
Internal V
CC
Voltage
INTV
CC
Load Regulation
Nominal Frequency
Lowest Frequency
Highest Frequency
(Note 7)
8.5V < V
IN
< 30V
I
CC
= 0mA to 20mA
V
PLLLPF
= No Connect
V
PLLLPF
= 0V
V
PLLLPF
= INTV
CC
360
220
475
650
5.0
INTV
CC
Linear Regulator
5.25
0.2
400
250
530
115
800
–5
5
5.5
1.0
440
280
580
140
V
%
kHz
kHz
kHz
kHz
kHz
μA
μA
Oscillator and Phase-Locked Loop
Minimum Synchronizable Frequency PLLIN/MODE = External Clock; V
PLLLPF
= 0V
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; V
PLLLPF
= 2V
Phase Detector Output Current
Sinking Capability
Sourcing Capability
f
PLLIN/MODE
< f
OSC
f
PLLIN/MODE
> f
OSC
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 LTC3834E-1 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with statistical
process controls. The LTC3834I-1 is guaranteed to meet performance
specifications over the –40°C to 85°C operating temperature range.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
LTC3834GN-1: T
J
= T
A
+ (P
D
• 90°C/W)
LTC3834DHC-1: T
J
= T
A
+ (P
D
• 43.5°C/W)
Note 4:
The LTC3834-1 is tested in a feedback loop that servos V
ITH
to a
specified voltage and measures the resultant V
FB.
Note 5:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7:
The minimum on-time condition is specified for an inductor
peak-to-peak ripple current 40% of I
MAX
(see Minimum On-Time
Considerations in the Applications Information section).
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ADI Reference Circuit
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