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參數(shù)資料
| 型號： | LTC1699-82 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | SMBus VID Voltage Programmers(SMBus 接口VID電壓編程器) |
| 中文描述： | VID電壓編程的SMBus（西元的SMBus接口電壓編程器） |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 250K |
| 代理商： | LTC1699-82 |
LTC1699 Series
SMBus VID
1
, 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.
I
Fully Compliant with Intel 5-Bit Mobile
(LTC1699-80) and Desktop VRM8.4 (LTC1699-81)
and VRM9.0 (LTC1699-82) VID Specifications
I
Precision
±
0.35% Programmable Resistor Divider
for Use with 0.8V Referenced DC/DC Converters
I
Two Different Divider Settings Can Be Stored Using a
2-Wire SMBus Serial Interface (Rev 1.1)
I
Built-In Safeguards Minimize Misprogramming Due
to Bus Conflicts
I
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
I
PGOOD Pin and 50
μ
s PGOOD Timer
I
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
50
μ
s if the divider setting changes or the converters are
turned on via the SMBus and the VRON pin.
I
Intel Desktop Pentium
III Power Supply
I
Intel Mobile Pentium
Power Supply with Intel
SpeedStep
TM
Technology
I
Desktop AMD Athlon
TM
Power Supply
I
Software Programmable Remote Power Supply
I
Power Supplies with Voltage Margining
Voltage Programmers
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CPU_ON
IO_ON
CLK_ON
PGOOD
SENSE
FB
VRON
SDA
SCL
SEL
NC
NC
NC
GND
GND
VRON
SDA
SCL
SEL
V
CC
U1
LTC1699-81
M1
M2
L1, 1
μ
H
C1
10
μ
F
25V
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
C2
10
μ
F
25V
C3
10
μ
F
25V
C9
22
μ
F
6.3V
C4
10
μ
F
25V
C5
10
μ
F
35V
ALUM
D2
D1
V
IN
5VDC
5
3
4
1
2
7
11
14
15
8
13
9
10
6
12
16
RUN/SS
PGOOD
V
RNG
FCB
I
TH
SGND
I
ON
V
FB
BOOST
TG
SW
PGND
BG
INTV
CC
V
IN
EXTV
CC
U2
LTC1778
1699 TA05
V
IN
5V
TO 20V
R4
10k
R3
1
R5
715k, 1%
R2, 11k
C7
0.22
μ
F
C15
220pF
C12
0.1
μ
F
C19, 0.01
μ
F
C8
0.01
μ
F
+
C11
180
μ
F
4V
GND
GND
5V
V
2.5V
AT 10A
+
C10
180
μ
F
4V
+
C18
2200pF
C14, 0.1
μ
F
C8, 0.01
μ
F
R1
39k
R9
100k
PGOOD
C13
4.7
μ
F
6.3V
SMBus Controlled High Efficiency DC/DC Converter
APPLICATIOU
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
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