LTC2970/LTC2970-1
2
Dual I C Power
Supply Monitor and
Margining Controller
Fea T Descrip T
n
Less Than 0.5% Total Unadjusted Error 14-Bit D The LTC 2970 is a dual power supply monitor and margin-
2
ADC with On-Chip Reference ing controller with an SMBus compatible I C bus interface.
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Dual, 8-Bit IDACs with 1x Voltage Buffers A low-drift, on-chip reference and 14-bit A/D converter
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Linear, Voltage Servo Adjusts Supply Voltages by allow precise measurements of supply voltages, load
Ramping IDAC Outputs Up/Down currents or internal die temperature. Fault management
2
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I C Bus Interface (SMBus Compatible) allows ALERT to be asserted for configurable overvoltage
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Extensive, User Configurable Fault Monitoring and undervoltage fault conditions. Two voltage buffered,
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On-Chip Temperature Sensor 8-bit IDACs allow highly accurate programming of DC/DC
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Available in 24-Pin 4mm 5mm QFN Package converter output voltages. The IDACs can be configured
to automatically servo the power supplies to the desired
voltages using the ADC. The LTC2970-1 adds a tracking
a T
feature that can be used to turn multiple power supplies
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Dual Power Supply Voltage Servo
on or off in a controlled manner.
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Monitoring Supply Voltage and Current
The bus address is set to 1 of 9 possible combinations by
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Programmable Power Supplies
pin strapping the ASEL0 and ASEL1 pins. The LTC2970/
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Programmable Reference
LTC2970-1 are packaged in a 24-pin, 4mm 5mm QFN
package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical a T
Dual Power Supply Monitor and Controller (One of Two Channels Shown) ADC Total Unadjusted Error
vs Temperature
8V TO 15V
0.50
0.1F 16 PARTS MOUNTED ON PCB
12V
IN
V
IN OUT V
IN DD
0.25
1/2 LTC2970
0.1F
GPIO_CFG
I+ V
IN0_BP 0
I V ALERT
IN0_BM
DC/DC
2
V SCL I C BUS
OUT0
CONVERTER
SMBUS 0.25
SDA
V ( )
IN0_AP COMPATIBLE
ADC VIN = 5V
RUN/SS FB LOAD I GPIO_0
OUT0
0.50
50 25 0 25 50 75 100 125 150
TEMPERATURE (C)
SGND V
IN0_AM REF
GND 29701 TA01b
GND ASEL0 ASEL1 0.1F
29701 TA01
29701fe
1
For more information www.linear.com/LTC2970
ERROR (%)
ion pplica
ions pplica
ion uresLTC2970/LTC2970-1
a Te Maxi Mu M r a T p c F T
(Notes 1 and 2)
TOP VIEW
Supply Voltages:
V .......................................................... 0.3V to 6V
DD
12V ..................................................... 0.3V to 15V
IN
24 23 22 21 20
Digital Input/Output Voltages:
V 1 19 SDA
IN0_AP
ASEL0, ASEL1 ............................. 0.3V to V + 0.3V V 2 18 SCL
DD IN0_AM
V
3 17 ALERT
SDA, SCL, GPIO_CFG, IN0_BP
25
V 4 16 GPIO_0
IN0_BM
ALERT, GPIO_0, GPIO_1........................... 0.3V to 6V GND
V 5 15 GPIO_1
IN1_AP
Analog Voltages:
V 6 14 I
IN1_AM OUT0
V , V , V ,
IN0_AP IN0_AM IN0_BP
V 7 13 I
IN1_BP OUT1
V , V , V , 8 9 10 11 12
IN0_BM IN1_AP IN1_AM
V , V , V , V ............... 0.3V to 6V
IN1_BP IN1_BM OUT0 OUT1
I , I , REF ......................... 0.3V to V + 0.3V
OUT0 OUT1 DD
UFD PACKAGE
RGND .................................................... 0.3V to 0.3V
24-LEAD (4mm 5mm) PLASTIC QFN
Operating Ambient Temperature Range: T = 150C, = 34C/W, = 3C/W
JMAX JA JC
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
LTC2970C ................................................ 0C to 70C
LTC2970I .............................................40C to 85C
LTC2970H .......................................... 40C to 125C
Storage Temperature Range .................. 65C to 150C