rectional current digital-to-analog converter that adjusts
the output voltage of any conventional V
FB
referenced
regulator. The LTC7106 can work with the vast majority
of power management controllers or regulators to enable
digital control of the output voltage. Internal power-on
reset circuitry keeps the DAC output current at zero
(high impedance IDAC) until a valid write takes place.
Features include a range bit for easy interfacing to almost
any impedance resistor divider, and an open-drain GPO
output for controlling the Run or Enable pin of the DC/
DC regulator. For most applications, the current DAC error
is significantly attenuated with proper design. See more
detail about V
OUT
accuracy in the Applications Information
section of this data sheet. The LTC7106 is supported by
the ADI
LTpowerPlay
®
development tool with graphical
user interface (GUI).
All registered trademarks and trademarks are the property of their respective owners.
n
n
n
n
n
n
n
n
±0.8% I
DAC
Positive Output Current Accuracy
(Over Temp)
±1.5% I
DAC
Negative Output Current Accuracy
(Over Temp)
PMBus/I
2
C Compliant Serial Interface
Input Voltage Range: 2.5V to 5.5V
High Impedance at IDAC Output When Disabled
Wide IDAC Operation Voltage (0.4V to 2.0V)
7-Bit Programmable DAC Output Current for DC/DC
V
OUT
Control
Wide Range IDAC Output Current: ±16μA to ±256μA
Programmable Slew Rate: 500ns ~ 3ms per Bit
Available in a 10-Lead (3mm × 2mm) DFN Package
APPLICATIONS
n
n
n
General Purpose Power Systems
Telecom Systems
Industrial Applications
TYPICAL APPLICATION
L1
V
IN
V
IN
DC/DC
V
FB
RUN
R4
10k
0 A TO 63 A
C1
1µF
SDA
PMBus INTERFACE
SCL
ALERT
10k
R3
10k
R2
10k
R1
SDA
SCL
ALERT
GND
ASEL0
V
DD
ASEL1
7106 TA01a
Margin High and Margin Low
SW
V
OUT
C2
330µF
CIRCUIT OF FIGURE 11
I
DAC
= –40 A
R
FB1
V
REF
(0.4V to 2V)
R
FB2
V
OUT
5V/DIV
V
OUT
= 24V
I
DAC
= 0 A
I
DAC
= 40 A
V
DD
2.5V
TO 5.5V
EN
2V/DIV
100ms/DIV
7106 TA01b
V
DD
EN
GPO
–64 A TO 0 A
LTC7106
IDAC
Document Feedback
For more information
www.analog.com
1
Rev A
LTC7106
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
SDA 1
SCL 2
V
DD
3
ALERT
4
GND 5
10 ASEL1
9
8
7
6
ASEL0
GPO
EN
IDAC
All Pins Except GND .................................. –0.3V to 6.0V
Operating Junction Temperature Range ... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
DDB PACKAGE
10-LEAD (3mm
×
2mm) PLASTIC DFN
θ
JA
= 55°C/W,
θ
JC
= 16.8°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC7106EDDB#PBF
LTC7106IDDB#PBF
TAPE AND REEL
LTC7106EDDB#TRPBF
LTC7106IDDB#TRPBF
http://www.linear.com/product/LTC7106#orderinfo
PART MARKING*
LHCG
LHCG
PACKAGE DESCRIPTION
10-Lead (3mm × 2mm) Plastic DFN
10-Lead (3mm × 2mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
Rev A
For more information
www.analog.com
LTC7106
ELECTRICAL CHARACTERISTICS
SYMBOL
V
DD
I
Q
I
SHUTDOWN
V
UVLO_R
V
UVLO_F
V
EN_R
V
EN_F
IDAC_OUT
I
DAC
Accuracy
Full Scale Positive
0.4 ≤ V
IDAC
≤ 2V (Note 3)
Full Scale Negative
0.4 ≤ V
IDAC
≤ 2V (Note 3)
Range = Normal
Range = Low
Range = High
Range = Normal
(0°C to 85°C)
Range = Normal
Range = Low
Range = High
LSB
0.4 ≤ V
IDAC
≤ 2V
Range = Normal
Range = Low
Range = High
INL
0.4 ≤ V
IDAC
≤ 2V
Range = Normal
Range = Low
Range = High
DNL
0.4 ≤ V
IDAC
≤ 2V
Range = Normal
Range = Low
Range = High
IHZ
V
IH
V
IL
C
PIN
V
OL
Input Capacitance
Output Low Voltage
I
SINK
= 3mA
Open-Drain Outputs: ALERTB, GPO, SDA
0.4
V
0.8
10
High-Z Current
0.4 ≤ V
IDAC
≤ 2V
V
EN
= 0
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2), V
DD
= 3.3V, unless otherwise specified.
PARAMETER
Power Supply
Supply Quiescent Current
Supply Quiescent Current
Undervoltage Rising Threshold
Undervoltage Falling Threshold
Enable Rising Threshold
Enable Falling Threshold
EN High
EN = 0V
V
DD
Rising
V
DD
Falling
V
EN
Rising
V
EN
Falling
0.8
62.5
15.5
246.7
–64.64
–64.96
–16.36
–262.50
63
15.75
252.00
–64
–64
–16
–256
1
0.25
4
–1
–1.5
–1.6
–0.3
–0.5
–0.8
1
1.5
1.6
0.3
0.5
0.8
20
1.4
63.5
16.0
255.3
–63.36
–63.04
–15.64
–249.50
CONDITIONS
MIN
2.5
TYP
700
800
2.35
2.15
1.35
MAX
5.5
1400
UNITS
V
μA
μA
V
V
V
V
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
LSB
LSB
LSB
LSB
LSB
LSB
nA
V
V
pF
Digital Input: SDA, SCL
For more information
www.analog.com
3
Rev A
LTC7106
PMBus INTERFACE TIMING CHARACTERISTICS
SYMBOL
f
SCL
t
BUF
t
HD_SDA
t
SU_SDA
t
SU_STO
t
HD_DAT(OUT)
t
HD_DAT(IN)
t
SU_DAT
t
LOW
t
HIGH
t
TIMEOUT_SMB
PARAMETER
Serial Bus Operating Frequency
Bus Free Time Between Stop and Start Condition
Hold Time After (Repeated) Start Condition
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time
Input Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Stuck PMBus Timer
CONDITIONS
The
l
denotes the specifications which
apply over the specified operating junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2), V
DD
= 3.3V, unless
otherwise specified.
MIN
10
1.3
0.6
0.6
0.6
300
0
100
1.3
0.6
30
10000
900
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
ns
ns
ns
µs
µs
ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC7106 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC7106E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC7106I is guaranteed
over the –40°C to 125°C operating junction temperature range. High
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