LTC3819 Datasheet, PDF (2/32 Pages) Linear Technology – 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs

LTC3819
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 – 5 V
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, NO_CPU,
VID0–VID4, Voltages ...............................7V to – 0.3V
Boosted Driver Voltage (BOOST-SW) ..........7V to – 0.3V
PLLFLTR, PLLIN, V_DIFFOUT,
FCB Voltages ................................... INTV_CC to – 0.3V
I_TH Voltage ................................................2.7V to – 0.3V
Peak Output Current <1µs(TG1, 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
TOP VIEW
RUN/SS 1
SENSE1⁺ 2
SENSE1^– 3
EAIN 4
PLLFLTR 5
PLLIN 6
FCB 7
I_TH 8
SGND 9
V_DIFFOUT 10
V_OS– 11
V_OS+ 12
SENSE2^– 13
SENSE2⁺ 14
ATTENOUT 15
NO_CPU 16
VID0 17
VID1 18
36 PGOOD
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 ATTENIN
22 V_BIAS
21 VID4
20 VID3
19 VID2
ORDER PART
NUMBER
LTC3819EG
G PACKAGE
36-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 85°C/W
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● 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
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
V_EAIN
Regulated Feedback Voltage
I_TH Voltage = 1.2V; Measured at V_EAIN (Note 4)
● 0.594 0.600 0.606
V
V_SENSEMAX Maximum Current Sense Threshold
● 62
75
88
mV
I_INEAIN
Feedback Current
(Note 4)
–5
– 50
nA
V_LOADREG Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop, ∆I_TH Voltage: 1.2V to 0.7V ●
Measured in Servo Loop, ∆I_TH Voltage: 1.2V to 2V ●
0.1
0.5
%
– 0.1 – 0.5
%
V_REFLNREG Reference Voltage Line Regulation
V_IN = 3.6V to 30V (Note 4)
0.002 0.02
%/V
V_FCB
Forced Continuous Threshold
● 0.57
0.6
0.63
V
I_FCB
Forced Continuous Current
– 0.17 – 1
µA
V_BINHIBIT
Burst Inhibit (Constant Frequency)
Threshold
Measured at FCB pin
4.3
4.8
V
V_OVL
UVLO
Output Overvoltage Threshold
Undervoltage Lockout
Measured at V_EAIN
V_IN Ramping Down
● 0.64 0.66 0.68
V
3
3.33
4
V
3819f
2