LTC1709-8_1 Datasheet, PDF (2/28 Pages) Linear Technology – 2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulators

LTC1709-8/LTC1709-9
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (V_IN).........................36V to – 0.3V
Topside Driver Voltages (BOOST1,2) .........42V to – 0.3V
Switch Voltage (SW1, 2) ..............................36V to – 5V
SENSE1⁺, SENSE2 ⁺, SENSE1^–,
SENSE2 ^– Voltages ........................ (1.1)INTV_CC to – 0.3V
EAIN, V_OS+, V_OS–, EXTV_CC, INTV_CC, RUN/SS,
V_BIAS, ATTENIN, ATTENOUT, PGOOD,
VID0–VID4, Voltages ...................................7V to – 0.3V
Boosted Driver Voltage (BOOST-SW) ..........7V to – 0.3V
PLLFLTR, PLLIN, V_DIFFOUT Voltages .... INTV_CC to – 0.3V
I_TH Voltage ................................................2.7V to – 0.3V
Peak Output Current <1µs(TGL1,2, BG1,2) ................ 3A
INTV_CC RMS Output Current ................................ 50mA
Operating Ambient Temperature Range
(Note 2) ................................................ – 40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
RUNN/SS 1
SENSE1⁺ 2
SENSE1^– 3
EAIN 4
PLLFLTR 5
PLLIN 6
NC 7
I_TH 8
SGND 9
V_DIFFOUT 10
V_OS– 11
V_OS+ 12
SENSE2^– 13
SENSE2⁺ 14
ATTENOUT 15
ATTENIN 16
VID0 17
VID1 18
TOP VIEW
36 NC
35 TG1
34 SW1
33 BOOST1
32 V_IN
31 BG1
30 EXTV_CC
29 INTV_CC
28 PGND
27 BG2
26 BOOST2
25 SW2
24 TG2
23 PGOOD
22 V_BIAS
21 VID4
20 VID3
19 VID2
ORDER PART
NUMBER
LTC1709EG-8
LTC1709EG-9
G PACKAGE
36-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 90°C/W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V, V_BIAS = 5V, V_RUN/SS = 5V unless otherwise noted.
SYMBOL PARAMETER
Main Control Loop
V_EAIN
V_SENSEMAX
I_INEAIN
V_LOADREG
Regulated Feedback Voltage
Maximum Current Sense Threshold
Feedback Current
Output Voltage Load Regulation
V_REFLNREG
V_OVL
UVLO
g_m
g_mOL
I_Q
I_RUN/SS
V_RUN/SS
Reference Voltage Line Regulation
Output Overvoltage Threshold
Undervoltage Lockout
Transconductance Amplifier g_m
Transconductance Amplifier Gain
Input DC Supply Current
Normal Mode
Shutdown
Soft-Start Charge Current
RUN/SS Pin ON Arming
CONDITIONS
MIN TYP MAX UNITS
I_TH Voltage = 1.2V (Note 4)
q
V_SENSE ^– = 5V
q
(Note 4)
(Note 4)
Measured in Servo Loop, ∆I_TH Voltage: 1.2V to 0.7V q
Measured in Servo Loop, ∆I_TH Voltage: 1.2V to 2V q
V_IN = 3.6V to 30V (Note 4)
Measured at V_EAIN
q
V_IN Ramping Down
I_TH = 1.2V, Sink/Source 5µA (Note 4)
I_TH = 1.2V, (g_mxZ_L; No Ext Load) (Note 4)
(Note 5)
EXTV_CC Tied to V_OUT, V_OUT = 5V
V_RUN/SS = 0V
V_RUN/SS = 1.9V
V_RUN/SS Rising
0.792
62
0.84
3
– 0.5
1.0
0.800
75
–5
0.1
– 0.1
0.002
0.86
3.5
3
1.5
470
20
– 1.2
1.5
0.808
88
– 50
0.5
– 0.5
0.02
0.88
4
40
1.9
V
mV
nA
%
%
%/V
V
V
mmho
V/mV
µA
µA
µA
V
2