LTC3728LX Linear Technology, LTC3728LX Datasheet - Page 2

• Manufacturer Part Number: LTC3728LX
• Description: 2-Phase Synchronous Regulators
• Manufacturer: Linear Technology

PACKAGE/ORDER I FOR ATIO
ABSOLUTE AXI U RATI GS
LTC3728L/LTC3728LX
Input Supply Voltage (V
Top Side Driver Voltages
(BOOST1, BOOST2) .................................. 36V to – 0.3V
Switch Voltage (SW1, SW2) ........................ 30V to – 5V
INTV
(BOOST2-SW2), PGOOD ............................ 7V to – 0.3V
SENSE1
SENSE2
PLLIN, PLLFLTR, FCB, Voltage ........... INTV
temperature range, otherwise specifications are at T
SYMBOL
Main Control Loops
V
I
V
V
g
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
2
VOSENSE1, 2
m1, 2
OSENSE1, 2
REFLNREG
LOADREG
CC,
V
V
RUN/SS1
SENSE1
PLLFLTR
SENSE2
SENSE2
OSENSE1
3.3V
OSENSE2
SENSE
PLLIN
SGND
EXTV
+
–
I
I
, SENSE2
FCB
OUT
TH1
TH2
28-LEAD NARROW PLASTIC SSOP
T
Voltages ....................... (1.1)INTV
JMAX
+
–
–
+
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation V
Output Voltage Load Regulation
Transconductance Amplifier g
10
11
12
13
14
1
2
3
4
5
6
7
8
9
= 125 C,
CC
GN PACKAGE
TOP VIEW
, RUN/SS1, RUN/SS2, (BOOST1-SW1),
W
+
JA
, SENSE1
= 95 C/W
28
27
26
25
24
23
22
21
20
19
18
17
16
15
IN
PGOOD
TG1
SW1
BOOST1
V
BG1
EXTV
INTV
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
)........................ 30V to – 0.3V
IN
W W
CC
CC
–
,
U
m
CONDITIONS
(Note 3); I
(Note 3); I
(Note 3)
(Note 3)
Measured in Servo Loop; I
Measured in Servo Loop; I
I
TH1, 2
LTC3728LCGN
LTC3728LEGN
IN
W
ORDER PART
= 3.6V to 30V (Note 3)
NUMBER
U
= 1.2V; Sink/Source 5uA; (Note 3)
CC
CC
A
TH1, 2
TH1, 2
= 25 C. V
to – 0.3V
to – 0.3V
Voltage = 1.2V (LTC3728LC)
Voltage = 1.2V (LTC3728LE/LTC3728LX)
The
U
(Note 1)
IN
denotes the specifications which apply over the full operating
= 15V, V
TH
TH
I
Peak Output Current <10 s (TG1, TG2, BG1, BG2) .. 3A
INTV
Operating Temperature Range (Note 7)
Junction Temperature (Note 2) ............................ 125 C
Storage Temperature Range ................ – 65 C to 125 C
Reflow Peak Body Temperature (UH Package) .... 260 C
Lead Temperature (Soldering, 10 sec)
V
PLLFLTR
TH1,
OSENSE1
3.3V
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2.0V
PLLIN
SGND
LTC3728LC/LTC3728LXC ....................... 0 C to 85 C
LTC3728LE ........................................ – 40 C to 85 C
(GN Package) ................................................... 300 C
I
I
FCB
OUT
TH1
TH2
RUN/SS1, 2
I
CC
TH2
1
2
3
4
5
6
7
8
EXPOSED PAD IS SGND (PIN 33),
32-LEAD (5mm 5mm) PLASTIC QFN
T
MUST BE SOLDERED TO PCB
Peak Output Current ................................ 40mA
32 31 30 29 28 27 26 25
9 10 11 12 13
JMAX
, V
= 125 C,
OSENSE1
UH PACKAGE
= 5V unless otherwise noted.
TOP VIEW
33
JA
14 15 16
= 34 C/W
, V
OSENSE2
24
23
22
21
20
19
18
17
0.792
0.788
BOOST1
V
BG1
EXTV
INTV
PGND
BG2
BOOST2
MIN
IN
CC
CC
Voltages ...2.7V to – 0.3V
www.DataSheet4U.com
0.800
0.800
0.002
– 0.1
TYP
0.1
1.3
– 5
LTC3728LCUH
LTC3728LEUH
LTC3728LXCUH
ORDER PART
MARKING
NUMBER
UH PART
3728L
3728LE
3728LX
0.808
0.812
MAX
0.02
– 0.5
– 50
0.5
3728lxfa
UNITS
mmho
%/V
nA
%
%
V
V