POWER LOSS (W)
LTC3816
Single-Phase Wide V
IN
Range DC/DC Controller for
Intel IMVP-6/IMVP-6.5 CPUs
Fae Tseru Dpircse Tnoi
n
Supports 7-Bit IMVP-6/IMVP-6.5 VID Code and
The LTC 3816 is a single-phase synchronous step-down
Features
DC/DC switching regulator controller that drives N-channel
n
Wide V Range: 4.5V to 36V Operation with
power MOSFETs in a constant-frequency voltage mode
IN
Optional Line Feedforward Compensation
architecture. The controllers leading edge modulation to-
n
t < 35ns, Capable of Very Low Duty Cycle
pology allows extremely low output voltages and supports
ON(MIN)
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Temperature Compensated Inductor DCR or Sense
a phase-lockable switching frequency up to 550kHz. The
Resistor Output Current Monitoring
output voltage is programmed using a 7-bit VID code.
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Differential Remote Output Voltage Sensing with
The LTC3816 features all of the IMVP-6/IMVP-6.5 require-
Programmable Active Voltage Positioning
ments, including start-up to a preset boot voltage, differ-
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Phase-Lockable Fixed Frequency: 150kHz to 550kHz
ential remote output voltage sensing with programmable
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Programmable UVLO, Preset V at Boot-Up
OUT
active voltage positioning, I output current reporting,
MON
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Programmable Slow Slew Rate Sleep State Exit
power optimization during sleep state, and fast or slow
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Internal LDO for Single Supply Operation
slew rate sleep state exit.
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Overvoltage and Overcurrent Protection
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Fault protection features include input undervoltage
PWRGD and VRTT# Thermal Throttling Flags
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lockout, cycle-by-cycle current limit, output overvoltage
Power Optimization During Sleep and Light Load
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protection, and PWRGD and overtemperature flags.
38-Pin Thermally Enhanced eTSSOP and 5mm 7mm
QFN Packages 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.
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n
Embedded Computing
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Mobile Computers, Internet Devices
n
Navigation Displays
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High Efficiency, Synchronous IMVP-6/ IMVP-6.5 Step-Down Controller
V V3
CCP
V
1.1V 3.3V IN
Efficiency and Power Loss
4.5V TO 36V
+
4.7F 47F 2 + 10F s 2s
vs Load Current
56 1.9k 1.9k
V EXTV INTV
IN CC CC
100 10
V = 12V, f = 400kHz
PWRGD PWRGD TG IN OSC
90 9
0.1F 0.33H, V = 0.75V, V = 5V
CLKEN# CLKEN# CC(CORE) EXTVCC
BOOST
1.3m FORCED CONTINUOUS MODE
VRTT# VRTT#
80 8
VR VR SW V
ON ON
CC(CORE)
NTC
+
DPRSLPVR DPRSLPVR 70 7
BG
330F 3s
MODE/SYNC MODE/SYNC
60 6
+ 10F 20s
INTV RFREQ
BSOURCE
CC
EFFICIENCY
2.55k
LFF
LTC3816
50 5
I
SENP
VID0-VID6 0.1F
40 4
I
SENN
RPTC
6.98k
30 3
8.25k
I
CSLEW MAX
10k
R 22pF 20 2
PTC SS
I
TCFB
V + V LOSS
470pF IN EXTVCC
15nF
14k 10 1
I
TC
5.1k
10k 0 0
I
MON
PREI
SERVO MON 0.01 0.1 1 10
12k 21k 15nF
22pF
I
MON LOAD CURRENT (A)
V
FB
V
2.2nF 10pF CC(SEN) 3816 TA01b
COMP V
SS(SEN)
3816 TA01
GND
3816f
EFFICIENCY (%)LTC3816
a ulosb T e Mixa Mu M r a Tsgni (Notes 1, 8)
Input Supply Voltage (V ) ......................... 0.3V to 40V DPRSLPVR, VRTT# .................................. 0.3V to 3.3V
IN
Topside Driver Voltage (BOOST) ................ 0.3V to 46V V , BSOURCE ................................. 0.3V to 0.3V
SS(SEN)
Switch Voltage (SW) ..................................... 5V to 40V INTV RMS Output Current .................................50mA
CC
INTV , EXTV , (BOOST-SW) .................. 0.3V to 6V Operating Junction Temperature Range
CC CC
I , I , PREI , I , RPTC, VR , V , (Note 3) .................................................. 40C to 125C
SENN TCFB MON MON ON CC(SEN)
V , SS, VIDn, RFREQ, MODE/SYNC, Storage Temperature Range .................. 65C to 125C
FB
LFF, I , I .........................0.3V to INTV + 0.3V Lead Temperature (Soldering, 10sec)
SENP MAX CC
PWRGD, CLKEN# ........................................ 0.3V to 6V eTSSOP .............................................................300C
p ni c no Farugi Tnoi
TOP VIEW
1 38 I
I
SENN MAX
TOP VIEW
2 37 I
I
TCFB SENP
3 36 LFF
I
TC
38 37 36 35 34 33 32
4 35 VRTT#
PREI
MON
PREI 1 31 CLKEN#
5 34 CLKEN# MON
I
MON
I 2 30 PWRGD
MON
6 33 PWRGD
RPTC
RPTC 3 29 SW
7 32 SW
VR
ON
VR TG
4 28
ON
8 31 TG
V
SS(SEN)
V BOOST
5 27
SS(SEN)
9 30 BOOST
V
CC(SEN)
V 6 26 V
39 CC(SEN) IN
39
10 29 V
SERVO
IN
GND
GND
SERVO 7 25 EXTV
CC
11 28 EXTV
V
FB CC
V 8 24 INTV
FB CC
12 27 INTV
COMP
CC
COMP 9 23 BG
13 26 BG
SS
SS 22 BSOURCE
10
14 25 BSOURCE
DPRSLPVR
DPRSLPVR 11 21 MODE/SYNC
15 24 MODE/SYNC
CSLEW
CSLEW 12 20 RFREQ
16 23 RFREQ
VID0
13 14 15 16 17 18 19
17 22 VID6
VID1
18 21 VID5
VID2
UHF PACKAGE
19 20 VID4
VID3
38-LEAD (5mm s 7mm) PLASTIC QFN
T = 125C, = 34C/W
JMAX JA
FE PACKAGE
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
38-LEAD PLASTIC eTSSOP
T = 125C, = 29C/W
JMAX JA
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
3816f
VID0 I
TC
VID1 I
TCFB
VID2 I
SENN
VID3 I
MAX
VID4 I
SENP
VID5 LFF
VID6 VRTT#