Datasheet LTC1876 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator |
| Páginas / Página | 36 / 4 — ELECTRICAL CHARACTERISTICS The |
| Formato / tamaño de archivo | PDF / 372 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS The
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LTC1876
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS1, 2 = 5V, AUXVIN = 3V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 3.3V Linear Regulator
V3.3OUT 3.3V Regulator Output Voltage No Load ● 3.25 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0mA to 10mA 0.5 2 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V 0.05 0.2 %
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD Trip Level, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative –6 –7.5 –9.5 % VOSENSE Ramping Positive 6 7.5 9.5 %
Aux Output
AUXVINMIN AUX Minimum Operating Voltage ● 2.4 2.6 V AUXVFB AUX Regulated Feedback Voltage ● 1.23 1.26 1.28 V AUXIFB AUX Feedback Pin Bias Current ● 120 360 nA AUXIQ AUX Input DC Supply Current Normal Mode VAUXSD = 2.4V, Not Switching 4 mA Shutdown VAUXSD = 0V 0.01 1 µA AUXVLINEREG AUX Line Regulation 2.6V ≤ AUXVIN ≤ 16V 0.01 0.05 %/V AUXfOSC AUX Oscillator Frequency ● 0.8 1.2 1.6 MHz AUXDCMAX AUX Oscillator Maximum Duty Cycle ● 84 86 % AUXILIMIT AUX Switch Current Limit (Note 9) 1 1.4 2 A AUXVCESAT AUX Switch Saturation Voltage ISW = 900mA (Note 10) 330 550 mV AUXILEAKAGE AUX Switch Leakage Current VSW = 5V 0.01 1 µA AUXVAUXSD AUX Shutdown Input Voltage AUX Shutdown Upper Trip Point 2.4 V AUX Shutdown Lower Trip Point 0.5 V IAUXSD AUXSD Pin Bias Current VAUXSD = 3V 16 32 µA VAUXSD = 0V 0.01 0.1 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 5:
Dynamic supply current is higher due to the gate charge being of a device may be impaired. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC1876E is guaranteed to meet performance specifications
Note 6:
Rise and fall times are measured using 10% and 90% levels. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating Delay times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specified for an inductor peak- with statistical process controls. to-peak ripple current ≥40% of IMAX (see Minimum On-Time
Note 3:
TJ is calculated from the ambient temperature TA and power Considerations in the Applications Information section). dissipation PD according to the following formulas:
Note 8:
VFREQSET pin internally tied to 1.19V reference through a large LTC1876EG: TJ = TA + (PD • 95°C/W) resistance.
Note 4:
The LTC1876 is tested in a feedback loop that servos VITH1, 2 to a
Note 9
: Current limit guaranteed by design and/or correlation to static test. specified voltage and measures the resultant VOSENSE1, 2.
Note 10
: 100% tested at wafer level. 1876fa 4
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS1, 2 = 5V, AUXVIN = 3V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 3.3V Linear Regulator
V3.3OUT 3.3V Regulator Output Voltage No Load ● 3.25 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0mA to 10mA 0.5 2 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V 0.05 0.2 %
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD Trip Level, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative –6 –7.5 –9.5 % VOSENSE Ramping Positive 6 7.5 9.5 %
Aux Output
AUXVINMIN AUX Minimum Operating Voltage ● 2.4 2.6 V AUXVFB AUX Regulated Feedback Voltage ● 1.23 1.26 1.28 V AUXIFB AUX Feedback Pin Bias Current ● 120 360 nA AUXIQ AUX Input DC Supply Current Normal Mode VAUXSD = 2.4V, Not Switching 4 mA Shutdown VAUXSD = 0V 0.01 1 µA AUXVLINEREG AUX Line Regulation 2.6V ≤ AUXVIN ≤ 16V 0.01 0.05 %/V AUXfOSC AUX Oscillator Frequency ● 0.8 1.2 1.6 MHz AUXDCMAX AUX Oscillator Maximum Duty Cycle ● 84 86 % AUXILIMIT AUX Switch Current Limit (Note 9) 1 1.4 2 A AUXVCESAT AUX Switch Saturation Voltage ISW = 900mA (Note 10) 330 550 mV AUXILEAKAGE AUX Switch Leakage Current VSW = 5V 0.01 1 µA AUXVAUXSD AUX Shutdown Input Voltage AUX Shutdown Upper Trip Point 2.4 V AUX Shutdown Lower Trip Point 0.5 V IAUXSD AUXSD Pin Bias Current VAUXSD = 3V 16 32 µA VAUXSD = 0V 0.01 0.1 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 5:
Dynamic supply current is higher due to the gate charge being of a device may be impaired. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC1876E is guaranteed to meet performance specifications
Note 6:
Rise and fall times are measured using 10% and 90% levels. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating Delay times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specified for an inductor peak- with statistical process controls. to-peak ripple current ≥40% of IMAX (see Minimum On-Time
Note 3:
TJ is calculated from the ambient temperature TA and power Considerations in the Applications Information section). dissipation PD according to the following formulas:
Note 8:
VFREQSET pin internally tied to 1.19V reference through a large LTC1876EG: TJ = TA + (PD • 95°C/W) resistance.
Note 4:
The LTC1876 is tested in a feedback loop that servos VITH1, 2 to a
Note 9
: Current limit guaranteed by design and/or correlation to static test. specified voltage and measures the resultant VOSENSE1, 2.
Note 10
: 100% tested at wafer level. 1876fa 4