LTC2978A Datasheet, PDF (7/80 Pages) Linear Technology – 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement

LTC2978A
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_J = 25°C. V_PWR = V_{IN_SNS} = 12V; V_DD33, V_DD25, REFP and REFM pins floating,
unless otherwise indicated. C_VDD33 = 100nF, C_VDD25 = 100nF and C_REF = 100nF.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TUE_{VIN_SNS} VIN_ON, VIN_OFF Threshold Total
3V ≤ V_{VIN_SNS} ≤ 8V
l
Unadjusted Error
V_{VIN_SNS} > 8V
l
READ_VIN Total Unadjusted Error
3V ≤ V_{VIN_SNS} ≤ 8V
l
V_{VIN_SNS} > 8V
l
DAC Soft-Connect Comparator Characteristics
±2.0
%
±1.0
%
±1.5
%
±1.0
%
V_{OS_CMP}
Offset Voltage
Temperature Sensor Characteristics
l
±3
±18
mV
TUE_TS
Total Unadjusted Error
±1
°C
V_OUT Enable Output (V_{OUT_EN} [3:0]) Characteristics
V_{VOUT_ENn} Output High Voltage (Note 12)
I_{VOUT_ENn} = –5µA, V_DD33 = 3.3V
l 11.6
12.5
14.7
V
I_{VOUT_ENn} Output Sourcing Current
V_{VOUT_ENn} Pull-Up Enabled, V_{VOUT_ENn} = 1V l
–5
–6
–8
µA
Output Sinking Current
Strong Pull-Down Enabled,
V_{VOUT_ENn} = 0.4V
l
3
5
8
mA
Weak Pull-Down Enabled, V_{VOUT_ENn} = 0.4V l
33
50
60
µA
Output Leakage Current
Internal Pull-Up Disabled,
l
0V ≤ V_{VOUT_ENn} ≤ 15V
±1
µA
V_OUT Enable Output (V_{OUT_EN} [7:4]) Characteristics
I_{VOUT_ENn} Output Sinking Current
Strong Pull-Down Enabled,
V_{OUT_ENn} = 0.1V
l
3
6
9
mA
Output Leakage Current
0V ≤ V_{VOUT_ENn} ≤ 6V
l
±1
µA
V_IN Enable Output (V_{IN_EN}) Characteristics
V_{VIN_EN}
Output High Voltage
I_{VIN_EN} = –5µA, V_DD33 = 3.3V
l 11.6
12.5
14.7
V
I_{VIN_EN}
Output Sourcing Current
V_{IN_EN} Pull-Up Enabled, V_{VIN_EN} = 1V
l
–5
–6
–8
µA
Output Sinking Current
V_{VIN_EN} = 0.4V
l
3
5
8
mA
Leakage Current
Internal Pull-Up Disabled,
l
0V ≤ V_{VIN_EN} ≤ 15V
±1
µA
EEPROM Characteristics
Endurance (Notes 8, 11)
0°C < T_J < 85°C During EEPROM Write
Operations
l 10,000
Cycles
Retention (Notes 8, 11)
T_J < 85°C
l
10
t_{MASS_WRITE} Mass Write Operation Time (Note 9) STORE_USER_ALL, 0°C < T_J < 85°C During l
EEPROM Write Operations
Years
440
4100
ms
Digital Inputs SCL, SDA, CONTROL0, CONTROL1, WDI/RESETB, FAULTB00, FAULTB01, FAULTB10, FAULTB11, WP
V_IH
V_IL
V_HYST
I_LEAK
High Level Input Voltage
Low Level Input Voltage
Input Hysteresis
Input Leakage Current
l 2.1
V
l
1.5
V
20
mV
0V ≤ V_PIN ≤ 5.5V, SDA, SCL, CONTROLn l
Pins Only
±2
µA
0V ≤ V_PIN ≤ V_DD33 + 0.3V, FAULTBzn,
l
WDI/RESETB, WP Pins Only
±2
µA
t_SP
Pulse Width of Spike Suppressed
FAULTBzn, CONTROLn Pins Only
SDA, SCL Pins Only
10
µs
98
ns
t_{FAULT_MIN}
Minimum Low Pulse Width for
Externally Generated Faults
110
ms
2978af
For more information www.linear.com/LTC2978A
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