LTC3738 Datasheet, PDF (2/32 Pages) Linear Technology – 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

LTC3738
ABSOLUTE AXI U RATI GS
(Note 1)
Topside Driver Voltages (BOOST_N) ............ 38V to –0.3V
Switch Voltage (SW_N)................................... 32V to –5V
Boosted Driver Voltage (BOOST_N – SW_N) .... 7V to –0.3V
Peak Output Current <1ms (TG_N, BG_N) ..................... 5A
Supply Voltage (V_CC), PGOOD, VR_HOTB
Pin Voltages ................................................ 7V to –0.3V
OUTEN, SS, PLLFLTR,
FCB/SYNC Voltages ................................... V_CC to –0.3V
I_TH Voltage ................................................ 2.4V to –0.3V
IN⁺, IN^–, VID0-VID5, TSNS .............................. 5V to 0V
AVP, SENSE⁺, SENSE^– .................................. 1.9V to 0V
Operating Ambient Temperature Range ....... 0°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ..................–65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
FCB/SYNC 1
PLLFLTR 2
IN^– 3
IN⁺ 4
AVP 5
EAIN 6
SENSE1⁺ 7
SENSE1^– 8
SENSE2⁺ 9
SENSE2^– 10
SENSE3^– 11
SENSE3⁺ 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 TG1
30 SW1
29 BOOST2
28 TG2
27 SW2
26 V_CC
25 BG1
24 PGND
23 BG2
22 BG3
21 SW3
20 TG3
UHF PACKAGE
38-LEAD (7mm × 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 34°C/W
EXPOSED PAD (PIN 39) IS SGND MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
UHF PART
MARKING
LTC3738CUHF
3738
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_CC = V_OUTEN = V_SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Main Control Loop
V_REGULATED Regulated Voltage at IN⁺
(Note 3); VID Code = 110101, V_ITH = 1.2V
●
V_SENSEMAX
I_MATCH
V_LOADREG
V_REFLNREG
g_m
g_mOL
V_FCB
I_FCB
Maximum Current Sense Threshold V_EAIN = 0.5V, V_ITH Open,
V_SENSE1–_, V_SENSE2–_, V_SENSE3– = 0.8V, 1.85V
●
Current Match
Worst-Case Error at V_SENSE(MAX)
Output Voltage Load Regulation
(Note 3)
Measured in Servo Loop, ∆I_TH Voltage = 1.2V to 0.7V ●
Measured in Servo Loop, ∆I_TH Voltage = 1.2V to 2V ●
Output Voltage Line Regulation
Transconductance Amplifier g_m
V_CC = 4.5V to 7V
I_TH = 1.2V, Sink/Source 25µA (Note 3)
Transconductance Amplifier GBW I_TH = 1.2V, (g_m • Z_L, Z_L = Series 1k-100kΩ-1nF)
Forced Continuous Threshold
●
FCB Bias Current
V_FCB = 0.65V
MIN
1.166
1.163
65
62
–5
0.58
TYP
1.175
1.175
75
75
0.1
– 0.1
0.03
3.05
1.5
0.60
0.2
MAX UNITS
1.184
V
1.187
V
85
mV
88
mV
5
%
0.5
%
– 0.5
%
%/V
mmho
MHz
0.62
V
0.7
µA
3738f
2