ltc3717-1 Linear Technology Corporation, ltc3717-1 Datasheet - Page 2

• Manufacturer Part Number: ltc3717-1
• Description: Wide Operating Range, No Rsense Step-down Controller For Ddr/qdr Memory Termination
• Manufacturer: Linear Technology Corporation

ABSOLUTE AXI U RATI GS
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are T
SYMBOL
Buck Regulator
I
V
g
t
t
t
V
V
LTC3717-1
(Note 1)
Boosted Topside Driver Supply Voltage
V
EXTV
(BOOST – SW) Voltages ............................ 7V to – 0.3V
V
I
TG, BG, INTV
TG, BG, INTV
Operating Ambient Temperature
Junction Temperature (Note 2) ............................ 125 C
Storage Temperature Range ................. – 65 C to 125 C
Reflow Peak Body Temperature ............................ 260 C
2
Q(VIN)
ON
ON(MIN)
OFF(MIN)
TH
m(EA)
FB
SENSE(MAX)
SENSE(MIN)
V
V
IN
ON
FB(LINE)
FB(LOAD)
(BOOST) ............................................... 42V to – 0.3V
Range (Note 4) ................................... – 40 C to 85 C
, V
, I
, V
ON
CC
FB
REF
, SW, SENSE
, DRV
Voltages...................................... 2.7V to – 0.3V
, V
RNG
CC
CC
CC
PARAMETER
Input DC Supply Current (V
Feedback Voltage Accuracy
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
V
Minimum Current Sense Threshold
V
PGND
PGND
Normal
Shutdown Supply Current
, EXTV
, EXTV
, RUN/SS, PGOOD,
Voltages .......(INTV
W
– V
– V
+
SW
SW
CC
CC
Voltage .................. 36V to – 0.3V
(Source)
(Sink)
, DRV
, DRV
W W
CC
CC
Peak Currents ....... 2A
RMS Currents .. 50mA
IN
)
CC
+ 0.3V) to – 0.3V
A
U
= 25 C. V
CONDITIONS
V
I
V
I
I
I
I
I
V
V
V
V
V
V
TH
TH
TH
ON
ON
ON
RUN/SS
IN
RNG
RNG
RNG
RNG
RNG
RNG
The
= 1.2V (Note 3), V
= 0.5V to 1.9V (Note 3)
= 1.2V (Note 3)
= 4V to 36V, I
= 30 A, V
= 60 A, V
= 180 A
= 1V, V
= 0V, V
= INTV
= 1V, V
= 0V, V
= INTV
IN
= 0V
= 15V, unless otherwise noted.
denotes specifications which apply over the full operating
CC
CC
FB
FB
FB
FB
ON
ON
, V
, V
= V
= V
= V
= V
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
= 0V
= 0V
FB
FB
TH
ORDER PART NUMBER
REF
REF
REF
REF
= V
= V
= 1.2V (Note 3)
REF
/2 – 50mV
/2 – 50mV
/2 + 50mV
/2 + 50mV
REF
REF
LTC3717EUH-1
= 2.4V
/2 – 50mV
/2 + 50mV
EXPOSED PAD IS SGND (PIN 33) MUST BE SOLDERED TO PCB
PGOOD
SGND
V
V
RNG
V
I
I
NC
ON
ON
TH
FB
1
2
3
4
5
6
7
8
32-LEAD (5mm 5mm) PLASTIC QFN
32 31 30 29 28 27 26 25
9 10 11 12
T
JMAX
= 125 C,
UH PACKAGE
TOP VIEW
– 0.65
–140
– 200
0.93
MIN
186
108
148
–97
33
95
76
13 14 15 16
JA
= 34 C/ W
U
QFN PART MARKING
– 0.05
0.002
–165
–115
– 235
1000
1.13
TYP
233
115
300
135
185
0.1
15
50
95
37171
W
24
23
22
21
20
19
18
17
SW
SENSE
NC
SENSE
PGND
BG
DRV
INTV
– 270
2000
–190
–133
MAX
– 0.3
0.65
1.33
280
135
100
400
162
114
222
30
CC
sn37171 37171fs
CC
+
–
UNITS
U
%/V
mS
mV
mV
mV
mV
mV
mV
ns
ns
ns
ns
%
%
A
A