Datasheet LTC1877 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | High Efficiency Monolithic Synchronous Step-Down Regulator |
| Pages / Page | 18 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 246 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC1877
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 = 5V unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPLL LPF Phase Detector Output Current Sinking Capability fPLLIN < fOSC l 3 10 20 μA Sourcing Capability fPLLIN > fOSC l –3 –10 –20 μA RPFET RDS(ON) of P-Channel MOSFET ISW = 100mA 0.65 0.85 Ω RNFET RDS(ON) of N-Channel MOSFET ISW = –100mA 0.75 0.95 Ω IPK Peak Inductor Current VFB = 0.7V, Duty Cycle < 35% 0.8 1.0 1.25 A ILSW SW Leakage VRUN = 0V, VSW = 0V or 8.5V, VIN = 8.5V ±0.01 ±1 μA VSYNC/MODE SYNC/MODE Threshold l 0.3 1.0 1.5 V ISYNC/MODE SYNC/MODE Leakage Current ±0.01 ±1 μA VRUN RUN Threshold l 0.3 0.7 1.5 V IRUN RUN Input Current ±0.01 ±1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formulas: Maximum Rating condition for extended periods may affect device LTC1877EMS8: TJ = TA + (PD)(150°C/W) reliability and lifetime.
Note 4:
The LTC1877 is tested in a feedback loop which servos VFB to the
Note 2:
The LTC1877E is guaranteed to meet specifi cations from 0°C to balance point for the error amplifi er (VITH = 1.2V). 85°C. Specifi cations over the –40°C to 85°C operating temperature range
Note 5:
Dynamic supply current is higher due to the gate charge being are assured by design, characterization and correlation with statistical delivered at the switching frequency. process controls. The LTC1877I is guaranteed over the full –40°C to 85°C operating temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Input Voltage Effi ciency vs Output Current Effi ciency vs Output Current
100 100 95 ILOAD = 100mA V I IN = 3.6V 95 LOAD = 10mA 90 L = 15μH 90 90 80 VIN = 7.2V 85 L = 10μH 85 V 70 IN = 7.2V ILOAD = 300mA 80 I 80 LOAD = 1mA 60 VIN = 3.6V 75 50 75 70 40 EFFICIENCY (%) I 70 LOAD = 0.1mA EFFICIENCY (%) EFFICIENCY (%) 65 30 PULSE-SKIPPING MODE Burst Mode OPERATION 65 60 V 20 OUT = 2.5V VIN = 10V 55 L = 10μH 10 VOUT = 2.5V 60 VOUT = 3.3V Burst Mode OPERATION L = 10μH Burst Mode OPERATION 50 0 55 0 2 4 6 8 10 12 0.1 1.0 10 100 1000 0.1 1.0 10 100 1000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1877 G01 1877 G02 1877 G03 1877fb 3
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 = 5V unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IPLL LPF Phase Detector Output Current Sinking Capability fPLLIN < fOSC l 3 10 20 μA Sourcing Capability fPLLIN > fOSC l –3 –10 –20 μA RPFET RDS(ON) of P-Channel MOSFET ISW = 100mA 0.65 0.85 Ω RNFET RDS(ON) of N-Channel MOSFET ISW = –100mA 0.75 0.95 Ω IPK Peak Inductor Current VFB = 0.7V, Duty Cycle < 35% 0.8 1.0 1.25 A ILSW SW Leakage VRUN = 0V, VSW = 0V or 8.5V, VIN = 8.5V ±0.01 ±1 μA VSYNC/MODE SYNC/MODE Threshold l 0.3 1.0 1.5 V ISYNC/MODE SYNC/MODE Leakage Current ±0.01 ±1 μA VRUN RUN Threshold l 0.3 0.7 1.5 V IRUN RUN Input Current ±0.01 ±1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formulas: Maximum Rating condition for extended periods may affect device LTC1877EMS8: TJ = TA + (PD)(150°C/W) reliability and lifetime.
Note 4:
The LTC1877 is tested in a feedback loop which servos VFB to the
Note 2:
The LTC1877E is guaranteed to meet specifi cations from 0°C to balance point for the error amplifi er (VITH = 1.2V). 85°C. Specifi cations over the –40°C to 85°C operating temperature range
Note 5:
Dynamic supply current is higher due to the gate charge being are assured by design, characterization and correlation with statistical delivered at the switching frequency. process controls. The LTC1877I is guaranteed over the full –40°C to 85°C operating temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Input Voltage Effi ciency vs Output Current Effi ciency vs Output Current
100 100 95 ILOAD = 100mA V I IN = 3.6V 95 LOAD = 10mA 90 L = 15μH 90 90 80 VIN = 7.2V 85 L = 10μH 85 V 70 IN = 7.2V ILOAD = 300mA 80 I 80 LOAD = 1mA 60 VIN = 3.6V 75 50 75 70 40 EFFICIENCY (%) I 70 LOAD = 0.1mA EFFICIENCY (%) EFFICIENCY (%) 65 30 PULSE-SKIPPING MODE Burst Mode OPERATION 65 60 V 20 OUT = 2.5V VIN = 10V 55 L = 10μH 10 VOUT = 2.5V 60 VOUT = 3.3V Burst Mode OPERATION L = 10μH Burst Mode OPERATION 50 0 55 0 2 4 6 8 10 12 0.1 1.0 10 100 1000 0.1 1.0 10 100 1000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1877 G01 1877 G02 1877 G03 1877fb 3
