Datasheet LTC3828 (Analog Devices) - 4
| Hersteller | Analog Devices |
| Beschreibung | Dual, 2-Phase Step-Down Controller with Tracking |
| Seiten / Seite | 32 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| Dateiformat / Größe | PDF / 388 Kb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3828
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 15V, VRUN1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 Down –6 –7.5 –9.5 % VOSENSE Ramping Up 6 7.5 9.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
Rise and fall times are measured using 10% and 90% levels. Delay may cause permanent damage to the device. Exposure to any Absolute times are measured using 50% levels. Maximum Rating condition for extended periods may affect device
Note 6:
The minimum on-time condition is specifi ed for an inductor reliability and lifetime. peak-to-peak ripple current ≥40% of IMAX (see minimum on-time
Note 2:
TJ is calculated from the ambient temperature TA and power considerations in the Applications Information section). dissipation PD according to the following formulas:
Note 7:
The LTC3828E is guaranteed to meet performance specifi cations LTC3828UH: TJ = TA + (PD • 34°C/W) over the –40°C to 85°C operating temperature range as assured by design, LTC3828G: TJ = TA + (PD • 95°C/W) characterization and correlation with statistical process controls.
Note 3:
The IC is tested in a feedback loop that servos VITH1, 2 to a
Note 8:
This parameter is guaranteed by design. specifi ed voltage and measures the resultant VOSENSE1, 2.
Note 4:
Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency vs Output Current Effi ciency vs Output Current Effi ciency vs Input Voltage and Mode (Figure 14) (Figure 14) (Figure 14)
100 100 100 Burst Mode VIN = 7V 90 OPERATION 80 90 V 90 IN = 15V 70 CONSTANT FREQUENCY 60 (BURST DISABLE) 80 80 50 40 70 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 VIN = 20V 20 FORCED 60 V 60 CONTINUOUS IN =15V VOUT = 5V 10 V MODE OUT = 5V VOUT = 5V IOUT = 3A f = 260kHz f = 260kHz f = 260kHz 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 10 15 20 25 30 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V 3828 G01 3828 G02 3828 G03 3828fc 4
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 15V, VRUN1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 Down –6 –7.5 –9.5 % VOSENSE Ramping Up 6 7.5 9.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
Rise and fall times are measured using 10% and 90% levels. Delay may cause permanent damage to the device. Exposure to any Absolute times are measured using 50% levels. Maximum Rating condition for extended periods may affect device
Note 6:
The minimum on-time condition is specifi ed for an inductor reliability and lifetime. peak-to-peak ripple current ≥40% of IMAX (see minimum on-time
Note 2:
TJ is calculated from the ambient temperature TA and power considerations in the Applications Information section). dissipation PD according to the following formulas:
Note 7:
The LTC3828E is guaranteed to meet performance specifi cations LTC3828UH: TJ = TA + (PD • 34°C/W) over the –40°C to 85°C operating temperature range as assured by design, LTC3828G: TJ = TA + (PD • 95°C/W) characterization and correlation with statistical process controls.
Note 3:
The IC is tested in a feedback loop that servos VITH1, 2 to a
Note 8:
This parameter is guaranteed by design. specifi ed voltage and measures the resultant VOSENSE1, 2.
Note 4:
Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency vs Output Current Effi ciency vs Output Current Effi ciency vs Input Voltage and Mode (Figure 14) (Figure 14) (Figure 14)
100 100 100 Burst Mode VIN = 7V 90 OPERATION 80 90 V 90 IN = 15V 70 CONSTANT FREQUENCY 60 (BURST DISABLE) 80 80 50 40 70 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 VIN = 20V 20 FORCED 60 V 60 CONTINUOUS IN =15V VOUT = 5V 10 V MODE OUT = 5V VOUT = 5V IOUT = 3A f = 260kHz f = 260kHz f = 260kHz 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 10 15 20 25 30 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V 3828 G01 3828 G02 3828 G03 3828fc 4