LTC3717 Datasheet, PDF (2/20 Pages) Linear Technology – Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

LTC3717
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (V_CC, I_ON) .................36V to – 0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................... 42V to – 0.3V
SW Voltage .................................................. 36V to – 5V
EXTV_CC, (BOOST – SW), RUN/SS,
PGOOD Voltages ....................................... 7V to – 0.3V
V_REF, V_RNG Voltages ...............(INTV_CC + 0.3V) to – 0.3V
I_TH, V_FB Voltages...................................... 2.7V to – 0.3V
TG, BG, INTV_CC, EXTV_CC Peak Currents .................... 2A
TG, BG, INTV_CC, EXTV_CC RMS Currents .............. 50mA
Operating Ambient Temperature
Range (Note 4) ................................... – 40°C to 85°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN/SS 1
PGOOD 2
V_RNG 3
I_TH 4
SGND 5
I_ON 6
V_FB 7
V_REF 8
16 BOOST
15 TG
14 SW
13 PGND
12 BG
11 INTV_CC
10 V_CC
9 EXTV_CC
GN PACKAGE
16-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 130°C/ W
ORDER PART
NUMBER
LTC3717EGN
GN PART
MARKING
3717
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS _{The q denotes specifications which apply over the full operating}
temperature range, otherwise specifications are T_A = 25°C. V_CC = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
I_Q
Input DC Supply Current
Normal
Shutdown Supply Current
V_FB
∆V_FB(LINEREG)
∆V_FB(LOADREG)
g_m(EA)
t_ON
Feedback Voltage Accuracy
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
t_ON(MIN)
t_OFF(MIN)
V_SENSE(MAX)
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold (Source)
V_PGND – V_SW
V_SENSE(MIN)
Minimum Current Sense Threshold (Sink)
V_PGND – V_SW
∆V_FB(OV)
∆V_FB(UV)
V_RUN/SS(ON)
V_RUN/SS(LE)
V_RUN/SS(LT)
I_RUN/SS(C)
I_RUN/SS(D)
Output Overvoltage Fault Threshold
Output Undervoltage Fault Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
V_RUN/SS = 0V
I_TH = 1.2V (Note 3), V_REF = 2.4V
V_CC= 4V to 36V, I_TH = 1.2V (Note 3)
I_TH = 0.5V to 1.9V (Note 3)
I_TH = 1.2V (Note 3)
I_ON = 30µA
I_ON = 60µA
I_ON = 180µA
I_ON = 30µA
V_RNG = 1V, V_FB = V_REF/2 – 50mV
V_RNG = 0V, V_FB = V_REF/2 – 50mV
V_RNG = INTV_CC, V_FB = V_REF/2 – 50mV
V_RNG = 1V, V_FB = V_REF/2 + 50mV
V_RNG = 0V, V_FB = V_REF/2 + 50mV
V_RNG = INTV_CC, V_FB = V_REF/2 + 50mV
RUN/SS Pin Rising
RUN/SS Pin Falling
– 0.65
q
0.93
186
95
q 108
q 76
q 148
q – 140
q – 97
q – 200
8
q 0.8
– 0.5
0.8
1000
15
0.002
– 0.05
1.13
233
115
50
300
135
95
185
– 165
– 115
– 235
10
– 25
1.5
4
3.5
– 1.2
1.8
2000
µA
30
µA
0.65
%
%/V
– 0.3
%
1.33
mS
280
ns
135
ns
100
ns
400
ns
162
mV
114
mV
222
mV
– 190
mV
– 133
mV
– 270
mV
12
%
%
2
V
4.5
V
4.2
V
–3
µA
3
µA
sn3717 3717fs
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