LTC1706I-19 [Linear]
VID Voltage Programmer; VID电压编程器
| 型号： | LTC1706I-19 |
| 厂家： | 
Linear |
| 描述： | VID Voltage Programmer |
| 文件： | 总8页 (文件大小：216K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1706-19
VID Voltage Programmer
U
DESCRIPTIO
FEATURES
The LTC®1706-19 is a precision, digitally programmed,
resistive ladder which adjusts the output of any 1.19V
referenced regulator. Depending on the state of the four
VID inputs, an output voltage between 1.3V and 2V is
programmed in 50mV increments.
■
Programs Regulator Output Voltage from 1.3V to
2V in 50mV Steps
■
Programs an Entire Family of Linear Technology
DC/DC Converters
■
Fully Compliant with the Intel Mobile VID
Specification
The LTC1706-19 is designed specifically to program an
entirefamilyofLinearTechnologyDC/DCconvertersinfull
compliance with the Intel Mobile VID specification.
■
±0.25% Accurate Output Voltage
■
Built-In 40k Pull-Up Resistors on VID Inputs
■
Available in SO-8 Packaging
The LTC1706-19 programs the following Linear Technol-
ogy DC/DC converter products: LTC1433, LTC1434,
LTC1435, LTC1435A, LTC1436, LTC1437, LTC1438,
LTC1439, LTC1538-AUX, LTC1539, LTC1624 and
LTC1625. (Consult factory for future compatible DC/DC
converter products.)
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APPLICATIONS
Intel Mobile Pentium® II Processor Power Supply
Notebook and Palmtop Computers, PDAs
Portable Instruments
Battery-Powered Equipment
■
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
■
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TYPICAL APPLICATIO
Intel Mobile Pentium II Processor Power Supply
V
IN
C
OSC
R
4.5V TO 22V
F
47pF
4.7Ω
1
2
3
13
16
C
V
IN
OSC
C
IN
+
10µF
30V
X2
M1
Si4410
RUN/SS
TG
C
F
I
C
TH
SS
0.1µF
0.1µF
L1
3.3µH
R
SENSE
LTC1435A
0.015Ω
14
12
V
SW
OUT
C
1.3V TO 2V
7A
C
1000pF
SENSE
V
INTV
CC
CC
C
C2
R
C
220pF
10k
*D
B
5
6
SGND
0.22µF
C
OUT
+
50pF
15
820µF
4V
FB
BOOST
BG
LTC1706-19
V
+
OSENSE
X2
4.7µF
11
10
M2
Si4410
D1
MBRS140T3
VID
PGND
+
0 1 2 3
GND
–
SENSE
7
SENSE
8
FROM µP
1000pF
1706-19 TA01
*CMDSH-3
1
LTC1706-19
W W
U W
U
W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
(Voltages Referred to GND Pin)
TOP VIEW
NUMBER
Input Supply Voltage (VCC) ..........................–0.3V to 7V
VID Input Pins .............................................–0.3V to 7V
SENSE Pin ...................................................–0.3V to 7V
FB Pin ..........................................................–0.3V to 7V
Operating Temperature Range
VID2
VID3
1
2
3
4
8
7
6
5
VID1
VID0
SENSE
FB
LTC1706CS8-19
LTC1706IS8-19
V
CC
GND
S8 PART
MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
LTC1706C-19 .......................................... 0°C to 70°C
LTC1706I-19 ...................................... –40°C to 85°C
Junction Temperature........................................... 110°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TJMAX = 110°C, θJA = 120°C/W
170619
706I19
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, 2.7V ≤ VCC ≤ 5.5V, VID0 = VID1 = VID2 = VID3 = N. C., unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
5
UNITS
V
V
Operating Supply Voltage Range
Supply Current
2.7
CC
I
(Note 2)
0.1
15
µA
VCC
R
Resistance Between SENSE and FB
Output Voltage Accuracy
VID Input Pull-Up Resistance
VID Input Voltage Threshold
●
●
8
20
kΩ
%
FB-SENSE
V
Error %
Programmed From 1.3V to 2V
–0.25
0.25
OUT
R
V
= 0.6V, V = 5V, (Note 3)
40
kΩ
PULLUP
DIODE
CC
VID
V
V
(2.7V ≤ V ≤ 5.5V)
(2.7V ≤ V ≤ 5.5V)
0.4
V
V
T
IL
CC
1.6
IH
CC
I
VID Input Leakage Current
VID Pull-Up Voltage
V
< VID < 7V, (Note 3)
0.01
±1
µA
VID-LEAK
CC
V
V
V
= 3.3V
= 5V
2.8
4.5
V
V
PULLUP
CC
CC
The
●
denotes specifications which apply over the full specified
be approximately equal to the number of grounded VID input pins times
(V – 0.6V)/40k. (See the Typical Applications section for more detail.)
CC
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 3: Each built-in pull-up resistor attached to the VID inputs also has a
series diode connected to V to allow input voltages higher than the V
CC
CC
supply without damage or clamping. (See Operation section for further
detail.)
Note 2: With all four VID inputs floating, the V supply current is simply
CC
the device leakage current. However, the V supply current will rise and
CC
2
LTC1706-19
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Error % vs Output Voltage
Typical Error % vs Temperature
0.25
0.25
V
OUT
= 1.3V
V
OUT
= 1.7V
0
0
V
OUT
= 2V
–0.25
–0.25
–50
0
50
100
1.3
1.5
1.7
1.9 2.0
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1706-19 G02
1706-19 G01
RFB1 vs Temperature
IVID-PULLUP vs Temperature
30
20
10
0
120
100
80
60
40
20
0
V
CC
= 5V
–50
0
50
100
–50
0
50
100
TEMPERATURE (°C)
TEMPERATURE (°C)
1706-19 G03
1706-19 G04
Supply Current vs Temperature
Supply Current vs Supply Voltage
5
4
3
2
1
0
2.0
1.5
1.0
0.5
0
V
CC
= 5V
V
CC
= 3.3V
V
CC
= 2.7V
0
2
4
6
8
–50
0
50
100
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
1706-19 G06
1706-19 G05
3
LTC1706-19
U
U
U
PI FU CTIO S
VID2 (Pin 1): 2nd MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID2 adds 200mV to the
output sense voltage.
FB(Pin5):FeedbackInput. Connecttothe1.19Vfeedback
pin of a compatible regulator.
SENSE (Pin 6): Regulator Output Voltage. Connect di-
rectly to regulator output sense node.
VID3 (Pin 2): 1st MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID3 adds 400mV to the
output sense voltage.
VID0 (Pin 7): LSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID0 adds 50mV to the
output sense voltage.
VCC (Pin 3): Power Supply Voltage. Range from 2.7V to
5.5V.
VID1 (Pin 8): 3rd MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID1 adds 100mV to the
output sense voltage.
GND (Pin 4): Ground. Connect to regulator signal ground.
NOMINAL (V)
TYP
ABSOLUTE MAX (V)
PIN
1
NAME
VID2
VID3
DESCRIPTION
MIN
0
MAX
MIN
–0.3
–0.3
–0.3
0
MAX
2nd MSB Programmable Input
1st MSB Programmable Input
Power Supply
V
V
7
7
7
0
7
7
7
7
CC
CC
2
0
3
V
2.7
5.5
CC
4
GND
FB
Ground
0
5
1.19V Feedback Input
Regulator Output Voltage
LSB Programmable Input
3rd MSB Programmable Input
0
1.3
0
1.19
1.5
2
–0.3
–0.3
–0.3
–0.3
6
SENSE
VID0
VID1
7
V
V
CC
CC
8
0
W
BLOCK DIAGRA
V
CC
V
CC
V
CC
V
CC
V
CC
40k
40k
40k
40k
VID0
VID1
VID2
VID3
SENSE
R
R
FB1
FB
SWITCH
CONTROL
LOGIC
FB2
GND
1706-19 BD
4
LTC1706-19
U
OPERATIO
Table 1. VID Inputs and Corresponding Output Voltage
The LTC1706-19 is a precision resistive divider designed
specifically for use with an entire family of Linear Technol-
ogy Corporation DC/DC switching regulators with 1.19V
internalreferenceandfeedbackvoltages.TheLTC1706-19
produces an output voltage ranging from 1.3V to 2V in
50mV steps by closing the loop between the output
voltage sense and the feedback input of the regulator with
the appropriate resistive divider network.
CODE
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
VID3
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
VID2
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
VID1
GND
GND
Float
Float
GND
GND
Float
GND
GND
GND
Float
Float
GND
GND
Float
VID0
GND
Float
GND
Float
GND
Float
GND
GND
GND
Float
GND
Float
GND
Float
GND
OUTPUT
2.00V
1.95V
1.90V
1.85V
1.80V
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
The “top” feedback resistor, RFB1, connected between
SENSE and FB, is typically 15k and is not modified by the
state of the VID program inputs. However, the “bottom”
feedback resistor, RFB2, is modified by the four VID inputs
and is precisely ratioed to RFB1
.
VID Programming
Programming is accomplished by applying the proper
voltage (or float condition) on the four digital VID inputs.
VID3 is the most significant bit (MSB), and VID0 is the
least significant bit (LSB). When all four inputs are low, or
grounded, the regulator output voltage is set to 2V. Each
increasing binary count is equivalent to a decrease of
50mv in the output voltage. Therefore, to obtain a 1.3V
output, the three MSBs are left floating, or high, while only
the LSB, VID0, is grounded. A list of programmed inputs
and their corresponding output voltages is shown in
Table 1.
Voltage Sensing and Feedback Pins
The FB pin is a high impedance node that requires mini-
mum layout distance to reduce extra loading and
unwanted stray pickup.
When used with the LTC1435A, the LTC1706-19’s FB,
SENSE, VCC and GND pins should be connected, respec-
tively, with the VOSENSE, VOUT, INTVCC and SGND pins of
the LTC1435A. The result of this application is a precisely
controlled variable voltage supply for any low voltage
system such as a palmtop or a laptop computer.
When all four VID inputs are high or floating (1111), such
as when no CPU is present in a system, a regulated 1.25V
output is generated at VSENSE
.
Each VID input pin is pulled up by a 40k resistor in series
with a diode connected to VCC. Therefore, it should be
grounded (or driven low) to produce a digital low input. It
can be either floated or connected to VCC to get a digital
high input. The series diode is included to prevent the
input from being damaged or clamped if it is driven higher
than VCC.
5
LTC1706-19
U
OPERATIO
VID Input Characteristics
When a VID input is grounded, there will be a higher
quiescentcurrentflowfromVCC becauseofaresistorfrom
VCC through a series diode to the input. This increase in
quiescent current is calculated from
The VID inputs should be driven with a maximum VIL of
0.4V and a minimum VIH of 1.6V. However, the VID input
range is not limited to values below VCC. Because of the
diode between VCC and the pull-up resistor, the inputs can
go higher than VCC without being bootstrapped to VCC or
damaging the input. This allows the LTC1706-19 to be
logiccompatibleandoperationaloveramuchhigherinput
voltagerange(lessthanthe7Vabsolutemaximumrating).
N•(VCC – VDIODE)/RPULLUP
.
N is the number of grounded VID inputs.
VDIODE istypically0.6VwhileRPULLUP hasatypicalpull-up
resistance of 40kΩ. In other words, each VID input has a
typical pull-up current of (VCC – 0.6V)/40k, which is
approximately 68µA for a 3.3V system.
U
TYPICAL APPLICATIO S
450mA, Low Noise Monolithic Current Mode Step-Down DC/DC Converter
0.1µF
68µF
20V
D1*
1
2
3
4
5
6
7
8
16
L1**
100µH
SSW
NC
PWRV
IN
INPUT VOLTAGE
3.5V TO 12V
V
OUT
PGND 15
14
1.3V TO 2V
450mA
6
10k
BSW
NC
SV
IN
SENSE
3
13
12
11
10
NC
2.7V TO 5.5V
0.1µF
V
CC
C
OSC
LTC1433
SGND
RUN/SS
LBO
POR
POWER ON RESET
C
OUT
+
I
TH
5
820µF
4V
FB
LTC1706-19
0.1µF
V
5.1k
680pF
47pF
OSENSE
× 2
LBI
V
PROG
VID
6800pF
0 1 2 3
7 8 1 2
GND
4
FROM µP
1706-19 TA02
* MOTOROLA MBRS130LT3
** COILCRAFT D03316-104
6
LTC1706-19
U
TYPICAL APPLICATIO S
High Efficiency Low Noise Synchronous Step-Down Switching Regulator
0.1µF
10k
EXTERNAL
FREQUENCY
SYNCHRONIZATION
1
24
V
IN
C
OSC
PLL LPF
PLLIN
4.5V TO 22V
39pF
2
3
4
18
C
V
OSC
IN
C
IN
+
22µF
35V
X2
21
19
M1
RUN/SS
TGL
TGS
Si4412DY
I
C
TH
M3
IRLML2803
SS
0.1µF
L1
3.3µH
R
SENSE
0.02Ω
LTC1436A-PLL
V
OUT
20
17
1.3V TO 2V
5A
SW
C
C
6
510pF
SENSE
3
5
7
NC
V
PROG
V
CC
INTV
CC
R
C
10k
*D
6
8
B
SGND
0.22µF
C
OUT
+
100pF
22
100µF
10V
LTC1706-19
FB
BOOST
BG
V
+
OSENSE
D1
MBRS140T3
× 2
4.7µF
16
15
M2
Si4412DY
VID
0 1 2 3
8 1
PGND
+
GND
4
–
SENSE
9
SENSE
7
2
10
FROM µP
1000pF
1706-19 TA03
*CMDSH-3
Ultrafast Transient Response Low Dropout Regulator with Adjustable Output Voltage
V
V
IN
12V
CC
3.3V
0.1µF
3
7
6
5
1
2
3
4
8
7
6
5
V
CC
VID0
VID1
VID2
VID3
SENSE
SHDN
I
I
3.3V
POS
8
1
2
+
V
IN
NEG
220µF
LTC1706-19
LT1575-ADJ
1µF
5Ω
IRFZ24
GND
FB
GATE
FB
COMP
GND
4
ADJUSTABLE
V
OUT
1.27V TO 2.03V
(50.8mV STEPS)
7.5k
1µF
10pF
× 24
1000pF
1706-19 TA04
Used with the LT1575-ADJ, which has a 1.21V reference,
the LTC1706-19 programs the output voltage of the
ultrafast transient response low dropout regulator that’s
ideal for today’s power-hungry microprocessors. How-
ever, since the LT1575 does not have a 1.19V reference,
the output range will instead be from 1.27V to 2.03V in
steps of 50.8mV.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1706-19
U
TYPICAL APPLICATIO S
High Efficiency 3A SO-8 N-Channel Switching Regulator with Programmable Output
V
IN
V
4.8V TO 20V
CC
0.1µF
3
1000pF
7
8
1
2
6
5
1
2
3
4
8
7
6
5
V
–
CC
VID0
VID1
SENSE
SENSE
V
IN
C
IN
+
+
R
22µF
35V
× 2
SENSE
0.033Ω
I
/RUN BOOST
LTC1624
TH
LTC1706-19
470pF
Si4412DY
VID2
VID3
V
TG
FB
100pF
0.1µF
10µH
V
OUT
FB
GND
SW
1.3V TO 2V
3A
GND
4
C
OUT
100µF
6.8k
MBRS340T3
10V
× 2
1706-19 TA05
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0996
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
3
4
2
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PART NUMBER
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DESCRIPTION
COMMENTS
High Efficiency Step-Down and Inverting DC/DC Converter
1.2A, High Efficiency Step-Down DC/DC Converter
1.5A, 500kHz Step-Down Switching Regulator
Monolithic Switching Regulator, Burst ModeTM Operation
Constant Off-Time Monolithic, Burst Mode Operation
High Frequency, Small Inductor, High Efficiency
16-Pin Narrow SO and SSOP
LT1375/LT1376
LTC1435/LTC1435A
High Efficiency, Low Noise, Synchronous Step-Down Converter
LTC1436/LTC1436-PLL High Efficiency, Low Noise, Synchronous Step-Down Converter
24-Pin Narrow and 24-Pin SSOP
LTC1438/LTC1439
LTC1538-AUX
Dual, Low Noise, Synchronous Step-Down Converter
Dual, Low Noise, Synchronous Step-Down Converter
Multiple Output Capability
5V Standby Regulator in Shutdown
Burst Mode is a trademark of Linear Technlology Corporation.
170619f LT/TP 0299 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1999
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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