LTC3816_15 Datasheet, PDF (7/44 Pages) Linear Technology – Single-Phase Wide VIN Range DC/DC Controller for Intel IMVP-6/IMVP-6.5 CPUs

Typical Performance Characteristics
LTC3816
Load Regulation vs Temperature
0
–10
5A LOAD
–20
10A LOAD
–30
–40
–50
20A LOAD
–60
–70
–80 _{VIN = 12V, fOSC = 400kHz}
–90 ^VEXTVCC ^{= 0V, AVP = –3mV/A}
L = VISHAY IHLP5050CE01 0.33µH
–100
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3816 G09
PTC CONFIGURATION (FIGURE 12)
R_LPTC = VISHAY TFPT1206L1002FV
R_VDCRP = 23.2k, C_VDCRP = 10nF
NTC CONFIGURATION,
LAST PAGE CIRCUIT
NO TEMPERATURE COMPENSATION
LAST PAGE CIRCUIT, REPLACE NTC
WITH 10k RESISTOR
IDEAL VALUE
V_IMON vs Temperature
1.1 _{VIN = 12V, fOSC = 400kHz}
1.0 V_EXTVCC = 0V, AVP = –3mV/A
0.9 ^{RPREIMON = 5.1k, RIMON = 21k}
0.8
20A LOAD
0.7
0.6
0.5
10A LOAD
0.4
0.3
5A LOAD
0.2
0.1
L = VISHAY IHLP5050CE01 0.33µH
0
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3816 G11
PTC CONFIGURATION (FIGURE 12)
R_LPTC = VISHAY TFPT1206L1002FV
R_VDCRP = 23.2k, C_VDCRP = 10nF
NTC CONFIGURATION,
LAST PAGE CIRCUIT
NO TEMPERATURE COMPENSATION
LAST PAGE CIRCUIT, REPLACE NTC
WITH 10k RESISTOR
IDEAL VALUE
Line Regulation
0.7520
0.7515
0.7510
f_OSC = 400kHz, V_EXTVCC = 0V
FORCED CONTINUOUS MODE
NO LOAD
LAST PAGE CIRCUIT
0.7505
0.7500
0.7495
0.7490
0.7485
0.7480
04
8 12 16 20 24 28
V_IN (V)
3816 G10
Load Step in Forced Continuous
Mode
V_CC(CORE)
50mV/DIV
LOAD
CURRENT
20A/DIV
V_IN = 12V
20µs/DIV
V_CC(CORE) = 0.75V
f_OSC = 400kHz
FORCED CONTINUOUS MODE
AVP SLOPE = –3mV/A
3816 G12
Narrow TG Pulse Width with Low
V_CC(CORE) Ripple
V_CC(CORE)
20mV/DIV
V_TG-V_SW
2V/DIV
V_BG
5V/DIV
ZOOM IN
V_TG-V_SW
1V/DIV
20ns/DIV
∆t = 24.6ns
V_IN = 28V
20µs/DIV
V_CC(CORE) = 0.5V (I_LOAD = 0.5A)
f_OSC = 400kHz
FORCED CONTINUOUS MODE
3816 G13
Pulse-Skipping Mode at No Load
with Low V_CC(CORE) Ripple
V_CC(CORE)
20mV/DIV
V_TG-V_SW
2V/DIV
V_BG
5V/DIV
V_IN = 12V
100µs/DIV
V_CC(CORE) = 0.75V, NO LOAD
f_OSC = 400kHz
PULSE-SKIPPING MODE
3816 G14
Pulse-Skipping Mode
at 0.2A Load
V_CC(CORE)
20mV/DIV
V_TG-V_SW
2V/DIV
V_BG
5V/DIV
V_IN = 12V
5µs/DIV
V_CC(CORE) = 0.75V (I_LOAD = 0.2A)
f_OSC = 400kHz
PULSE-SKIPPING MODE
3816 G15
3816f