LTC2970-1_15 Datasheet, PDF (9/38 Pages) Linear Technology – Dual I2C Power Supply Monitor and Margining Controller

Typical Performance Characteristics
LTC2970/LTC2970-1
V_DD Regulator Load Regulation
0
–100
–200
–300
–400
–45°C
–500
–600
–700
25°C 90°C
V_12VIN = 12V
–800
0
–1
–2
–3
–4
–5
CURRENT (mA)
29701 G19
V_DD Regulator Line Regulation
400 _{NO LOAD ON VDD}
300
200
100
0
–45°C
–100
–200 _25°C
–300
90°C
–400
–500
8
9 10 10 12 13 14 15
V_12VIN (V)
29701 G20
V_DD Regulator Short-Circuit
Current vs Temperature
–25
V_12VIN = 12V
V_DD = 0V
–30
–35
–40
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
29701 G21
Pin Functions
V_{IN0_AP} (Pin 1): Positive CH0_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH0_A can be configured to servo
IDAC0.
V_{IN0_AM} (Pin 2): Negative CH0_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH0_A can be configured to servo
IDAC0.
V_{IN0_BP} (Pin 3): Positive CH0_B ADC Multiplexer Input. The
output of the differential, 7:1 multiplexer connects to the
input of the ADC. CH0_B is a voltage monitor input only.
V_{IN0_BM} (Pin 4): Negative CH0_B ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH0_B is a voltage monitor input only.
V_{IN1_AP} (Pin 5): Positive CH1_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH1_A can be configured to servo
IDAC1.
V_{IN1_AM} (Pin 6): Negative CH1_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH1_A can be configured to servo
IDAC1.
V_{IN1_BP} (Pin 7): Positive CH1_B ADC Multiplexer Input. The
output of the differential, 7:1 multiplexer connects to the
input of the ADC. CH1_B is a voltage monitor input only.
V_{IN1_BM} (Pin 8): Negative CH1_B ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH1_B is a voltage monitor input only.
V_DD (Pin 9): V_DD Power Supply, Voltage Monitor Input,
and Internal 5V Regulator Output. The supply input range
is 4.5V to 5.75V. The V_DD pin voltage can be connected
to the ADC through an internal mux. Bypass the V_DD pin
to device ground with a 100nF capacitor (C_VDD). If no 5V
input voltage supply is available, float the V_DD pin and
power the LTC2970 from the 12V_IN pin.
12V_IN (Pin 10): 12V Power Supply and Voltage Monitor
Input. An internal regulator generates 5V from 12V_IN. The
input range for 12V_IN is 8V to 15V. Bypass this pin with a
100nF capacitor. The regulator’s output is connected to
the V_DD pin. The 12V_IN pin voltage can also be monitored
by the ADC through a 3:1 attenuator and the internal mux.
If no 12V supply input is available, tie the 12V_IN to the V_DD
pin and operate from 4.5V to 5.75V.
V_OUT0 (Pin 11): CH0 Voltage Output. Buffered version of
IDAC0 output voltage.
For more information www.linear.com/LTC2970
29701fd
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