LTC1735CF#TR Linear Technology, LTC1735CF#TR Datasheet - Page 3

• Manufacturer Part Number: LTC1735CF#TR
• Description: IC SW REG SYNC STEP-DWN 20-TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1735CF#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 6 V
• Current - Output: 3A
• Frequency - Switching: 300kHz
• Voltage - Input: 4 ~ 30 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Other names: LTC1735CFTR

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
V
I
V
V
I
I
UVLO
I
t
TG t
TG t
BG t
BG t
TG/BG t
TG/BG t
Internal V
V
V
V
V
V
Oscillator
f
f
f
PGOOD Output (LTC1735F Only)
V
I
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Q
RUN/SS
SCL
SENSE
ON(MIN)
OSC
H
FCB(SYNC)
PGOOD
OVL
RUN/SS
RUN/SS
INTVCC
LDO(INT)
LDO(EXT)
EXTVCC
EXTVCC(HYS)
PGL
PG
V
/f
SENSE(MAX)
OSC
r
f
r
f
1D
2D
CC
Regulator
PARAMETER
Feedback Overvoltage Lockout
Input DC Supply Current
Run Pin Start Threshold
Run Pin Begin Latchoff Threshold
Soft-Start Charge Current
RUN/SS Discharge Current
Maximum Current Sense Threshold
Sense Pins Total Source Current
Minimum On-Time
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
Top Gate Off to Synchronous
Gate On Delay Time
Synchronous Gate Off to Top
Gate On Delay Time
Internal V
Internal V
EXTV
EXTV
EXTV
Oscillator Frequency
Maximum Sync Frequency Ratio
FCB Pin Threshold For Sync
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
Undervoltage Lockout
Normal Mode
Shutdown
CC
CC
CC
Drop Voltage
Switchover Voltage
Hysteresis
CC
CC
Load Regulation
Voltage
A
CONDITIONS
(Note 4)
V
V
V
V
Soft Short Condition, V
V
Measured at V
V
V
Tested with a Square Wave (Note 6)
(Note 7)
C
C
(Note 7)
C
C
C
C
6V < V
I
I
I
C
Ramping Negative
I
V
V
CC
CC
CC
PGOOD
RUN/SS
RUN/SS
RUN/SS
RUN/SS
RUN/SS
OSENSE
SENSE
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
OSC
PGOOD
OSENSE
= 25 C. V
V
V
= 0 to 20mA, V
= 20mA, V
= 20mA, EXTV
OSENSE
OSENSE
= 43pF (Note 5)
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
IN
–
The
= 2mA
, Ramping Positive
, Ramping Positive
= 5V
= 0V
= 0V
= 4.5V
= V
= 0.7V
with Respect to Set Output Voltage
< 30V, V
Ramping Negative
Ramping Positive
SENSE
IN
EXTVCC
IN
denotes specifications which apply over the full operating
= 15V, V
Pin (V
+
EXTVCC
CC
EXTVCC
= 0V
Note 2: T
dissipation P
LTC1735CS, LTC1735IS: T
LTC1735CGN, LTC1735IGN, LTC1735EGN: T
LTC1735CF, LTC1735IF: T
Ramping Positive
= 5V
IN
OSENSE
= 4V
RUN/SS
Ramping Down)
= 4V
J
is calculated from the ambient temperature T
= 0.5V,
D
= 5V unless otherwise noted.
according to the following formulas:
J
J
= T
= T
A
A
+ (P
+ (P
0.84
– 0.7
– 6.0
D
MIN
265
D
1.0
0.5
5.0
4.5
0.9
6.0
60
• 110 C/W)
• 110 C/W)
J
= T
– 1.2
– 7.5
0.86
TYP
450
160
100
130
300
110
1.5
4.1
3.5
5.2
0.2
4.7
0.2
1.3
1.2
7.5
15
75
60
50
50
50
40
70
2
A
+ (P
LTC1735
D
A
• 130 C/W)
and power
MAX
– 9.5
0.88
200
200
335
200
1.9
4.5
3.9
5.4
9.5
25
85
80
90
90
90
80
4
1
1
UNITS
1735fc
3
kHz
mV
mV
mV
ns
ns
ns
ns
ns
ns
ns
%
%
%
V
A
A
V
V
A
A
V
A
V
V
V
V
A