ltc1709-85 Linear Technology Corporation, ltc1709-85 Datasheet - Page 2

• Manufacturer Part Number: ltc1709-85
• Description: 2-phase, 5-bit Vid, Current Mode, High Efficiency, Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
LTC1709-85
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (V
Topside Driver Voltages (BOOST1,2) .........42V to – 0.3V
Switch Voltage (SW1, 2) .............................36V to – 5 V
SENSE1
EAIN, V
Boosted Driver Voltage (BOOST-SW) ..........7V to – 0.3V
PLLFLTR, PLLIN, V
I
Peak Output Current <1 s(TGL1,2, BG1,2) ................ 3A
INTV
Operating Ambient Temperature Range
Junction Temperature (Note 3) ............................. 125 C
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
temperature range, otherwise specifications are at T
SYMBOL
Main Control Loop
V
V
I
V
V
V
I
V
V
UVLO
g
g
2
INEAIN
FCB
TH
m
mOL
EAIN
SENSEMAX
LOADREG
REFLNREG
FCB
BINHIBIT
OVL
SENSE2
V
VID25mV–VID3 Voltages ........................7V to – 0.3V
FCB Voltages ................................... INTV
(Note 2) .............................................. – 40 C to 85 C
Voltage ................................................2.7V to – 0.3V
BIAS
CC
OS
RMS Output Current ................................ 50mA
, ATTENIN, ATTENOUT, PGOOD,
+
, SENSE2
+
PARAMETER
Regulated Feedback Voltage
Maximum Current Sense Threshold
Feedback Current
Output Voltage Load Regulation
Reference Voltage Line Regulation
Forced Continuous Threshold
Forced Continuous Current
Burst Inhibit (Constant Frequency)
Threshold
Output Overvoltage Threshold
Undervoltage Lockout
Transconductance Amplifier g
Transconductance Amplifier Gain
, V
–
Voltages ................... (1.1)INTV
OS
–
, EXTV
W
+
DIFFOUT
, SENSE1
CC
IN
).........................36V to – 0.3V
, INTV
,
W W
–
,
CC
m
, RUN/SS,
CONDITIONS
I
(Note 4)
(Note 4)
Measured in Servo Loop, I
Measured in Servo Loop, I
V
Measured at FCB pin
Measured at V
V
I
I
TH
TH
TH
IN
IN
U
CC
CC
Voltage = 1.2V (Note 4)
= 1.2V, Sink/Source 5 A (Note 4)
= 1.2V, (g
= 3.6V to 30V (Note 4)
Ramping Down
A
= 25 C. V
to – 0.3V
to – 0.3V
The
m
EAIN
• Z
IN
L
denotes the specifications which apply over the full operating
; No Ext Load) (Note 4)
= 15V, V
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
ATTENOUT
RUNN/SS
SENSE1
VID25mV
SENSE1
SENSE2
SENSE2
PLLFLTR
V
ATTENIN
TH
TH
DIFFOUT
BIAS
PLLIN
SGND
Voltage: 1.2V to 0.7V
Voltage: 1.2V to 2V
EAIN
V
V
VID0
FCB
OS
OS
I
TH
+
–
–
+
–
+
= 3.3V, V
T
JMAX
36-LEAD PLASTIC SSOP
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
= 125 C,
G PACKAGE
TOP VIEW
RUN/SS
JA
= 85 C/W
= 5V unless otherwise noted.
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
NC
TG1
SW1
BOOST1
V
BG1
EXTV
INTV
PGND
BG2
BOOST2
SW2
TG2
PGOOD
V
VID3
VID2
VID1
IN
BIAS
0.792
0.76
0.84
MIN
62
CC
CC
3
U
– 0.17
0.800
0.002
– 0.1
0.86
TYP
0.8
4.3
3.5
1.5
– 5
75
0.1
3
LTC1709EG-85
ORDER PART
NUMBER
W
0.808
MAX
– 0.5
– 50
0.02
0.84
0.88
4.8
– 1
88
0.5
4
170985f
UNITS
mmho
V/mV
U
%/V
mV
nA
%
%
V
V
A
V
V
V