LTC3816_15 Datasheet, PDF (1/44 Pages) Linear Technology – Single-Phase Wide VIN Range DC/DC Controller for Intel IMVP-6/IMVP-6.5 CPUs

LTC3816
Features
Single-Phase Wide V_IN
Range DC/DC Controller for
Intel IMVP-6/IMVP-6.5 CPUs
Description
n _{Supports 7-Bit IMVP-6/IMVP-6.5 VID Code and}
Features
n _{Wide VIN Range: 4.5V to 36V Operation with}
Optional Line Feedforward Compensation
n _{tON(MIN) < 35ns, Capable of Very Low Duty Cycle}
n _{Temperature Compensated Inductor DCR or Sense}
Resistor Output Current Monitoring
n _{Differential Remote Output Voltage Sensing with}
Programmable Active Voltage Positioning
n _{Phase-Lockable Fixed Frequency: 150kHz to 550kHz}
n _{Programmable UVLO, Preset VOUT at Boot-Up}
n _{Programmable Slow Slew Rate Sleep State Exit}
n _{Internal LDO for Single Supply Operation}
n _{Overvoltage and Overcurrent Protection}
n _{PWRGD and VRTT# Thermal Throttling Flags}
n _{Power Optimization During Sleep and Light Load}
n _{38-Pin Thermally Enhanced eTSSOP and 5mm × 7mm}
QFN Packages
Applications
The LTC^®3816 is a single-phase synchronous step-down
DC/DC switching regulator controller that drives N-channel
power MOSFETs in a constant-frequency voltage mode
architecture. The controller’s leading edge modulation to-
pology allows extremely low output voltages and supports
a phase-lockable switching frequency up to 550kHz. The
output voltage is programmed using a 7-bit VID code.
The LTC3816 features all of the IMVP-6/IMVP-6.5 require-
ments, including start-up to a preset boot voltage, differ-
ential remote output voltage sensing with programmable
active voltage positioning, I_MON output current reporting,
power optimization during sleep state, and fast or slow
slew rate sleep state exit.
Fault protection features include input undervoltage
lockout, cycle-by-cycle current limit, output overvoltage
protection, and PWRGD and overtemperature flags.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and R_SENSE
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 5408150, 5055767, 5481178, 6580258.
n _{Embedded Computing}
n _{Mobile Computers, Internet Devices}
n _{Navigation Displays}
Typical Application
High Efficiency, Synchronous IMVP-6/ IMVP-6.5 Step-Down Controller
V_CCP
V3
1.1V
3.3V
PWRGD
CLKEN#
VRTT#
R_PTC
2.2nF
56Ω 1.9k 1.9k
V_IN EXTV_CC INTV_CC
VR_ON
DPRSLPVR
MODE/SYNC
INTV_CC
PWRGD
TG
CLKEN#
VRTT#
BOOST
VR_ON
SW
DPRSLPVR
MODE/SYNC
BG
RFREQ
BSOURCE
LFF LTC3816
VID0-VID6
I_SENP
RPTC
I_SENN
CSLEW
22pF
SS
470pF
I_MAX
I_TCFB
10k
12k _22pF
10pF
SERVO
V_FB
COMP
GND
I_TC
PREI_MON
I_MON
V_CC(SEN)
V_SS(SEN)
4.7µF
0.1µF
2.55k
0.1µF
6.98k
8.25k
15nF 14k
5.1k
V_IN
+
4.5V TO 36V
47µF s2 + 10µF s2
0.33µH,
1.3mΩ
NTC
+ ^VCC(CORE)
330µF s3
+ 10µF s20
10k
I_MON
21k
15nF
3816 TA01
Efficiency and Power Loss
vs Load Current
100
10
V_IN = 12V, f_OSC = 400kHz
90 V_CC(CORE) = 0.75V, V_EXTVCC = 5V
9
80 ^{FORCED CONTINUOUS MODE}
8
70
7
60
6
50
EFFICIENCY
5
40
4
30
3
20
2
10
V_IN + V_EXTVCC LOSS
1
0
0.01
0
0.1
1
10
LOAD CURRENT (A)
3816 TA01b
3816f