LTC1699 Series
SMBus VID
Voltage Programmers
FEATURES
s
DESCRIPTIO
s
s
s
s
s
s
Fully Compliant with Intel 5-Bit Mobile
(LTC1699-80) and Desktop VRM8.4 (LTC1699-81)
and VRM9.0 (LTC1699-82) VID Specifications
Precision
±0.35%
Programmable Resistor Divider
for Use with 0.8V Referenced DC/DC Converters
Two Different Divider Settings Can Be Stored Using a
2-Wire SMBus Serial Interface (Rev 1.1)
Built-In Safeguards Minimize Misprogramming Due
to Bus Conflicts
Three Open-Drain Pins (CPU_ON, IO_ON, CLK_ON)
and a Global Control Pin (VRON)to Shutdown or
Soft-Start 3 DC/DC Converters Simultaneously
PGOOD Pin and 50µs PGOOD Timer
Available in MSOP-8 and SSOP-16 Package
The LTC
®
1699-80, LTC1699-81 and LTC1699-82 are pre-
cision (±0.35% max), digitally programmed resistor di-
viders that comply with Intel 5-bit mobile (LTC1699-80),
desktop VRM8.4 (LTC1699-81) and VRM9.0 (LTC1699-82)
VID specifications. Each IC can switch the output of a
DC/DC converter between two set voltages. A digital input
pin, SEL, selects one of two divider settings stored into
registers via a 2-wire SMBus interface.
The SMBus interface uses Write Word protocol to setup
the registers and to turn the DC/DC converters on or off.
Read Word protocol is used to verify register contents and
to return the On/Off status of the converters. The
LTC1699-80, LTC1699-81 and LTC1699-82 incorporate
safeguards against errors due to bus conflicts.
Three open-drain N-channel outputs (CPU_ON, IO_ON
and CLK_ON) are provided to turn DC/DC converter sup-
plies on or off via their RUN/SS inputs. A global control pin,
VRON is used to turn the converters on or off simulta-
neously. An internal timer pulls the PGOOD pin low for
50µs if the divider setting changes or the converters are
turned on via the SMBus and the VRON pin.
, LTC and LT are registered trademarks of Linear Technology Corporation.
AMD Athlon is a trademark of Advanced Micro Devices, Inc.
Pentium is a registered trademark of Intel Corporation.
Intel SpeedStep is a trademark of Intel Corporation.
APPLICATIO S
s
s
s
s
s
Intel Desktop Pentium
®
III Power Supply
Intel Mobile Pentium
®
Power Supply with Intel
SpeedStep
TM
Technology
Desktop AMD Athlon
TM
Power Supply
Software Programmable Remote Power Supply
Power Supplies with Voltage Margining
TYPICAL APPLICATIO
R9
100k
U1
LTC1699-81
VRON
SDA
SCL
SEL
5
3
4
1
2
7
11
14
15
VRON
SDA
SCL
SEL
NC
NC
NC
GND
GND
CPU_ON
FB
IO_ON
CLK_ON
PGOOD
8
13
9
10
6
12
SENSE 16
V
CC
PGOOD
SMBus Controlled High Efficiency DC/DC Converter
5V
R1
39k
C6
0.01µF
1
2
3
4
5
6
7
8
U2
LTC1778
16
RUN/SS BOOST
15
PGOOD
TG
14
V
RNG
SW
13
FCB
PGND
12
I
TH
BG
11
SGND
INTV
CC
10
I
ON
V
IN
9
V
FB
EXTV
CC
R5
715k, 1%
C19, 0.01µF
V
IN
D1
M1
C7
0.22µF
C1
10µF
25V
C2
10µF
25V
C3
10µF
25V
C4
10µF
25V
C8, 0.01µF
R2, 11k
L1, 1µH
C9
22µF
6.3V
M2
C13
4.7µF
6.3V
C15
220pF
C18
2200pF
R4
10k
R3
1Ω
C12
0.1µF
5VDC
C14, 0.1µF
U
+
C5
10µF
35V
ALUM
GND
V
IN
5V
TO 20V
U
U
+
D2
C10
180µF
4V
+
C11
180µF
4V
V
OUT
2.5V
AT 10A
GND
C1, C2, C3, C4, C9: TAIYO YUDAN
C5: SANYO
C10, C11: PANASONIC, SPCL. POLY.
D1: CMDSH-3
D2: DIODES INC., B340A
L1: TOKO, 919AS-1RON
M1: Si4884DY
M2: Si4874DY
1699 TA05
1
LTC1699 Series
ABSOLUTE
(Note 1)
AXI U RATI GS
Storage Temperature ...................... -65°C
≤
T
A
≤
150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Supply Voltage (V
CC
) ................................................. 7V
All Pins ........................................................– 0.3V to 7V
Operating Temperature
Range (Note 2) ................................ –40°C
≤
T
A
≤
85°C
Junction Temperature ........................................... 125°C
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
SEL
SDA
SCL
PGOOD
1
2
3
4
8
7
6
5
V
CC
GND
FB
SENSE
LTC1699EMS8-80
LTC1699EMS8-81
LTC1699EMS8-82
MS8 PART
MARKING
LTPV
LTPW
LTTB
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 200°C/W
Consult factory for parts specified with wider operating temperature ranges.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 2.7V
≤
V
CC
≤
5.5V (Notes 3, 4) unless otherwise stated.
SYMBOL
V
CC
I
CC
R
FB-SENSE
DE
V
IH
V
IL
V
IH
V
IL
V
HYST
V
OL
I
IN
PARAMETER
Operating Supply Voltage Range
Supply Current
Resistance between SENSE and FB
Divider Error
SCL, SDA Input High Voltage
SCL, SDA Input Low Voltage
SEL, VRON Input High Voltage
SEL, VRON Input Low Voltage
SEL, VRON Hysteresis
SDA, CPU_ON, IO_ON, CLK_ON
Output Low Voltage
SCL, SDA, SEL, VRON Input Current
I = 3mA
SDA Not Acknowledging, 0
≤
V
PIN
≤
5.5V,
V
PIN
= 5.5V for VRON only
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
CPU_ON, IO_ON, CLK_ON, PGOOD Pins Are Open
LTC1699-80, LTC1699-82
LTC1699-81
All Divider Settings
q
q
q
q
q
q
2
U
U
W
W W
U
W
TOP VIEW
SEL
NC
SDA
SCL
VRON
PGOOD
NC
CPU_ON
1
2
3
4
5
6
7
8
16 V
CC
15 GND
14 GND
13 FB
12 SENSE
11 NC
10 CLK_ON
9
IO_ON
ORDER PART
NUMBER
LTC1699EGN-80
LTC1699EGN-81
LTC1699EGN-82
GN PART
MARKING
169980
169981
169982
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 130°C/W
MIN
2.7
7
14
– 0.35
2.1
TYP
MAX
5.5
350
UNITS
V
µA
kΩ
kΩ
%
V
V
V
V
mV
10
20
13
26
0.35
0.8
1.3
0.8
1.3
±50
2.0
0.4
V
q
±10
µA
LTC1699 Series
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 2.7V
≤
V
CC
≤
5.5V (Notes 3, 4) unless otherwise stated.
SYMBOL
I
SK1
I
SK2
I
LKG
I
PU
f
SMB
t
BUF
t
HD:STA
t
SU:STA
t
SU:STO
t
HD:DAT
t
SU:DAT
t
LOW
t
HIGH
t
f
t
r
t
SSH
t
SSL
t
SPL
t
PH
t
PL
t
PPL
t
VH
t
VL
t
VPL
t
PGL
PARAMETER
SDA, PGOOD, CPU_ON, IO_ON,
CLK_ON Sink Current at V
CC
= 2.7V
SDA, PGOOD, CPU_ON, IO_ON,
CLK_ON Sink Current at V
CC
= 5.5V
PGOOD, CPU_ON, IO_ON,
CLK_ON Leakage Current
VRON Pull-Up Current
SMBus Operating Frequency
Bus Free Time Between Stop/Start
Hold Time After (Repeated) Start
Repeated Start Setup Time
Stop Condition Setup Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
SCL, SDA Fall Time
SCL, SDA Rise Time
SEL to SENSE High (Note 6)
SEL to SENSE Low (Note 6)
SEL Toggling to PGOOD Low
Stop Bit to CPU_ON, IO_ON
or CLK_ON High (Note 7)
Stop Bit to CPU_ON, IO_ON
or CLK_ON Low (Note 7)
Stop Bit to PGOOD Low (Note 6)
VRON High to CPU_ON, IO_ON
or CLK_ON High
VRON Low to CPU_ON, IO_ON,
CLK_ON Low
VRON Low to PGOOD Low
PGOOD Low Duration
0.9V
CC
to 0.65V
0.65V to 2.25V
Toggle SEL to Switch from Min V
OUT
to Max V
OUT
,
VFB = 0.8V
Toggle SEL to Switch from Max V
OUT
to Min V
OUT
,
VFB = 0.8V
Toggle SEL to Select New Code
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
C
L
= 0.1µF, 10kΩ Pull-Up, S1 in Figure 1
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
C
L
= 0.1µF, 10kΩ Pull-Up, S1 in Figure 1
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
0
≤
V
PIN
≤
2.7V
0
≤
V
PIN
≤
5.5V
0
≤
V
PIN
≤
5.5V
V
PIN
= 0
q
q
q
q
MIN
5
35
TYP
19
65
MAX
60
150
±2
UNITS
mA
mA
µA
µA
KHz
µs
µs
µs
µs
ns
ns
µs
µs
–1
10
4.7
4.0
4.7
4.0
300
250
4.7
4.0
– 2.5
–7
100
Timing (Note 5)
q
q
q
q
q
q
q
q
q
q
q
300
1000
500
500
160
500
2
20
50
250
2
50
130
30
50
500
70
ns
ns
ns
ns
ns
µs
µs
ns
µs
µs
ns
µs
Note1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LTC1699-80E, LTC1699-81E and LTC1699-82E are
guaranteed to meet performance specifications from 0°C to 70°C.
Specifications over the – 40°C to 85°C operating temperature range are
assured by design, characterization and correlation with statistical process
controls.
Note 3:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 4:
All typical numbers are given for V
CC
= 5V and T
A
= 25°C.
Note 5:
These parameters are guaranteed by design and are not tested in
production. SMBus timing is referenced to V
IL
and V
IH
levels.
Note 6:
Dominated by the switching regulator. The delay due to the
LTC1699-80, LTC1699-81 or LTC1699-82 is typically 500ns.
Note 7:
Measured from the rising edge of SDA during Data High
acknowledgement.
3
LTC1699 Series
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
350
300
SUPPLY CURRENT (µA)
250
200
150
100
50
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
V
CC
(V)
1699 G01
T
A
= 25°C
250
SUPPLY CURRENT (µA)
200
R
SENSE
(kΩ)
Resistance Between SENSE and
FB Pins vs Temperature
(LTC1699-80, LTC1699-82)
10.08
INPUT HIGH AND LOW VOLTAGE (V)
10.06
10.04
V
CC
= 2.7V TO 5.5V
1.40
INPUT HIGH AND LOW VOLTAGE (V)
R
SENSE
(kΩ)
10.02
10.00
9.98
9.96
9.94
9.92
– 55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G18
SCL, SDA, SEL and VRON
Hysteresis vs Temperature
0.07
0.06
0.05
HYSTERESIS (V)
0.04
0.03
0.02
0.01
0
– 55 –35 –15
V
CC
= 2.7V
HYSTERESIS (V)
0.10
0.09
V
CC
= 5.5V
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G06
OUTPUT LOW VOLTAGE (V)
4
U W
Supply Current vs Temperature
300
V
CC
= 5.5V
20.08
20.06
20.04
20.02
V
CC
= 2.7V
150
100
50
0
– 55 –35 –15
20.00
19.98
19.96
19.94
19.92
19.90
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G02
Resistance Between SENSE and FB
Pins vs Temperature (LTC1699-81)
V
CC
= 2.7V TO 5.5V
19.88
– 55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G03
SCL, SDA, SEL and VRON Input
High and Low Voltage vs
Temperature
1.5
INPUT HIGH, V
CC
= 5.5V
INPUT LOW, V
CC
= 5.5V
1.4
1.3
1.2
1.1
1.0
0.9
0.8
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G04
SCL, SDA, SEL and VRON Input
High and Low Voltage vs Supply
Voltage
T
A
= 25°C
INPUT HIGH
1.35
1.30
1.25
INPUT LOW
INPUT HIGH, V
CC
= 2.7V
1.20
INPUT LOW, V
CC
= 2.7V
1.15
1.10
– 55 –35 –15
2.5
3
3.5
4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
6.5
7
1699 G05
SCL, SDA, SEL and VRON
Hysteresis vs Supply Voltage
0.25
T = 25°C
0.20
SDA, CPU_ON, IO_ON, CLK_ON
Output Low Voltage vs
Temperature
I
PIN
= 3mA
V
CC
= 2.7V
0.15
0.10
V
CC
= 5.5V
0.05
0
2.5
3
3.5
4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
6.5
7
0
– 55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G08
1699 G07
LTC1699 Series
TYPICAL PERFOR A CE CHARACTERISTICS
SCL, SDA and SEL Input Current
vs Temperature
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
– 55
80
V
CC
= 5.5V
V
PIN
= 5.5V
SINK CURRENT (mA)
70
60
50
40
30
20
10
SEL PIN
–35 –15
SDA PIN
0
– 55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G10
LEAKAGE CURRENT (nA)
INPUT CURRENT (nA)
SCL PIN
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G09
VRON Pull-Up Current vs
Temperature
2.50
2.45
VRON
PULL-UP CURRENT (µA)
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
1.95
1.90
– 55 –35 –15
0
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G12
POWER GOOD LOW DURATION (µs)
VRON PULL-UP CURRENT (µA)
V
CC
= 5.5V
V
CC
= 2.7V
LTC1699-80 Divider Error vs
Temperature
0.05
V
CC
= 2.7V (MINIMUM V
CC
)
0
CODE 31
DIVIDER ERROR (%)
DIVIDER ERROR (%)
CODE 15
–0.05
CODE 16
–0.10
CODE 0
0.10
0.05
DIVIDER ERROR (%)
–0.15
–0.20
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G15
U W
SDA, PGOOD, CPU_ON, IO_ON,
CLK_ON Sink Current vs
Temperature
7
V
CC
= 5.5V, I
SK2
6
5
4
3
2
1
PGOOD, CPU_ON, IO_ON,
CLK_ON Leakage Current vs
Temperature
V
PIN
= 5.5V
V
CC
= 2.7V, I
SK1
0
–60 –40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1699 G11
VRON Pull-Up Current vs Supply
Voltage
3.0
2.5
2.0
1.5
1.0
0.5
T
A
= 25°C
V
RON
= 0V
Power Good Low Duration vs
Temperature
52.0
51.5
V
CC
= 5.5V
51.0
50.5
50.0
49.5
49.0
–60 –40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1699 G14
V
CC
= 2.7V
1.5
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
6.5
1699 G013
LTC1699-81 Divider Error vs
Temperature
0.25
0.20
0.15
V
CC
= 2.7V (MINIMUM V
CC
)
CODE 15
CODE 31
CODE 0
0
–0.05
–0.10
–0.15
–0.20
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G16
LTC1699-82 Divider Error vs
Temperature
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
–0.02
– 55 –35 –15
CODE 16
CODE 0
5 25 45 65 85 105 125
TEMPERATURE (°C)
1699 G17
V
CC
= 2.7V (MINIMUM V
CC
)
CODE 31
CODE 16
CODE 15
5
