lt3740 Linear Technology Corporation, lt3740 Datasheet - Page 2

• Manufacturer Part Number: lt3740
• Description: Wide Operating Range, Valley Mode, No Rsense Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

ABSOLUTE AXI U RATI GS
(Note 1)
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Operation Voltage
Maximum Operation Voltage
Input Supply Current
Feedback Reference Voltage
Feedback Voltage Line Regulation
FB Pin Input Current
Error Amplifier Transconductance
Controller Switching Frequency
Minimum Off Time
Current Limit
Reverse Current Limit
SHDN Voltage to Enable Device
SHDN Voltage to Disable Device
TGATE On Voltage
TGATE Off Voltage
BGATE On Voltage
BGATE Off Voltage
TGATE Rise Time
TGATE Fall Time
BGATE Rise Time
LT3740
SN
V
BIAS, TGATE, BGDP, SN
SWB Voltage ............................................................ 36V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
temperature range, otherwise specifications are at T
2
IN
–
, SHDN, SW, Range Voltages .............................. 22V
, BGATE, V
C
, FB, XREF, PGOOD Voltages ........... 10V
W
+
Voltages .......................... 32V
W W
CONDITIONS
SHDN = 0V
SHDN = 5V, BIAS = 14V, FB = 1.5V
FB = 800mV
V
RANGE = 0V
RANGE = Open
RANGE = V
C
C
C
XREF=1V
V
C
LOAD
LOAD
LOAD
IN
= 1.2V
= 2.5V to 22V
= 3300pF
= 3300pF
= 3300pF
IN
U
A
= 25°C, V
The
●
IN
denotes the specifications which apply over the full operating
= 5V unless otherwise noted. (Note 2)
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
BGATE
TGATE
PGND
BGDP
16-LEAD (5mm × 3mm) PLASTIC DFN
BIAS
SN
SN
SW
EXPOSED PAD IS GND (PIN 17),
T
MUST BE SOLDERED TO PCB
–
+
JMAX
1
2
3
4
5
6
7
8
= 125°C, θ
DHC PACKAGE
TOP VIEW
17
JA
= 43°C/W
16
15
14
13
12
11
10
9
V
FB
XREF
SHDN
PGOOD
RANGE
V
SWB
●
●
●
●
●
●
C
IN
MIN
260
794
2.2
1.1
25
55
80
U
TYP
230
380
300
500
105
800
0.006
ORDER PART
0.6
2.5
5.5
0.2
5.5
0.2
LT3740EDHC
50
80
35
30
30
50
DFN PART
MARKING
NUMBER
3740
W
MAX
330
700
115
140
808
0.5
22
85
UNITS
3740fa
U
kHz
mA
mV
mV
mV
mV
mV
μA
nA
μS
ns
ns
ns
ns
%
V
V
V
V
V
V
V
V