Datasheet LTC1874 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Dual Constant Frequency Current Mode Step-Down DC/DC Controller |
| Pages / Page | 12 / 2 — ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1) |
| File Format / Size | PDF / 190 Kb |
| Document Language | English |
ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1)
Model Line for this Datasheet
Text Version of Document
LTC1874
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
Input Supply Voltage (VIN, PVIN) ...– 0.3V to 10V TOP VIEW ORDER PART SENSE –, PGATE Voltages ... – 0.3V to (VIN + 0.3V) V 1 16 IN1 PVIN1 NUMBER VFB, ITH/RUN Voltages ..–0.3V to 2.4V SENSE1– 2 15 PGATE1 PGATE Peak Output Current (< 10µs) ... 1A GND1 3 14 PGND1 LTC1874EGN Storage Ambient Temperature Range ... – 65°C to 150°C V 4 13 FB1 ITH/RUN1 I 5 Operating Temperature Range (Note 2) .. – 40°C to 85°C 12 TH/RUN2 VFB2 PGND2 6 11 GND2 Junction Temperature (Note 3) ... 150°C GN PART MARKING PGATE2 7 10 SENSE2– Lead Temperature (Soldering, 10 sec).. 300°C PV 8 9 IN2 VIN2 1874 GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150°C, θJA = 135°C/ W Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS All specifications apply to each controller. The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 4.2V unless otherwise specified. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Input DC Supply Current (Per Controller) Typicals at VIN = 4.2V (Note 4) Normal Operation 2.4V ≤ VIN ≤ 9.8V 270 420 µA Sleep Mode 2.4V ≤ VIN ≤ 9.8V 230 370 µA Shutdown 2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V 8 22 µA UVLO VIN < UVLO Threshold 6 10 µA Undervoltage Lockout Threshold VIN Falling ● 1.55 2.0 2.35 V VIN Rising 1.85 2.3 2.40 V Shutdown Threshold (at ITH/RUN) ● 0.15 0.35 0.55 V Start-Up Current Source VITH/RUN = 0V 0.25 0.5 0.85 µA Regulated Feedback Voltage TA = 0°C to 70°C (Note 5) ● 0.780 0.800 0.820 V TA = – 40°C to 85°C (Note 5) ● 0.770 0.800 0.830 V Output Voltage Line Regulation 2.4V ≤ VIN ≤ 9.8V (Note 5) 0.05 mV/V Output Voltage Load Regulation ITH/RUN Sinking 5µA (Note 5) 2.5 mV/µA ITH/RUN Sourcing 5µA (Note 5) 2.5 mV/µA VFB Input Current (Note 5) 10 50 nA Overvoltage Protect Threshold Measured at VFB 0.820 0.860 0.895 V Overvoltage Protect Hysteresis 20 mV Oscillator Frequency VFB = 0.8V 500 550 650 kHz VFB = 0V 120 kHz Gate Drive Rise Time CLOAD = 3000pF 40 ns Gate Drive Fall Time CLOAD = 3000pF 40 ns Peak Current Sense Voltage (Note 6) 120 mV
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
Dynamic supply current is higher due to the gate charge being of a device may be impaired. delivered at the switching frequency.
Note 2:
The LTC1874E is guaranteed to meet performance specifications
Note 5:
Each controller in the LTC1874 is individually tested in a feedback from 0°C to 70°C. Specifications over the –40°C to 85°C operating loop that servos VFB to the output of the error amplifier. temperature range are assured by design, characterization and correlation
Note 6:
Peak current sense voltage is reduced dependent upon duty cycle with statistical process controls. to a percentage of value as given in Figure 2.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA°C/W) 2
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
Input Supply Voltage (VIN, PVIN) ...– 0.3V to 10V TOP VIEW ORDER PART SENSE –, PGATE Voltages ... – 0.3V to (VIN + 0.3V) V 1 16 IN1 PVIN1 NUMBER VFB, ITH/RUN Voltages ..–0.3V to 2.4V SENSE1– 2 15 PGATE1 PGATE Peak Output Current (< 10µs) ... 1A GND1 3 14 PGND1 LTC1874EGN Storage Ambient Temperature Range ... – 65°C to 150°C V 4 13 FB1 ITH/RUN1 I 5 Operating Temperature Range (Note 2) .. – 40°C to 85°C 12 TH/RUN2 VFB2 PGND2 6 11 GND2 Junction Temperature (Note 3) ... 150°C GN PART MARKING PGATE2 7 10 SENSE2– Lead Temperature (Soldering, 10 sec).. 300°C PV 8 9 IN2 VIN2 1874 GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150°C, θJA = 135°C/ W Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS All specifications apply to each controller. The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 4.2V unless otherwise specified. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Input DC Supply Current (Per Controller) Typicals at VIN = 4.2V (Note 4) Normal Operation 2.4V ≤ VIN ≤ 9.8V 270 420 µA Sleep Mode 2.4V ≤ VIN ≤ 9.8V 230 370 µA Shutdown 2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V 8 22 µA UVLO VIN < UVLO Threshold 6 10 µA Undervoltage Lockout Threshold VIN Falling ● 1.55 2.0 2.35 V VIN Rising 1.85 2.3 2.40 V Shutdown Threshold (at ITH/RUN) ● 0.15 0.35 0.55 V Start-Up Current Source VITH/RUN = 0V 0.25 0.5 0.85 µA Regulated Feedback Voltage TA = 0°C to 70°C (Note 5) ● 0.780 0.800 0.820 V TA = – 40°C to 85°C (Note 5) ● 0.770 0.800 0.830 V Output Voltage Line Regulation 2.4V ≤ VIN ≤ 9.8V (Note 5) 0.05 mV/V Output Voltage Load Regulation ITH/RUN Sinking 5µA (Note 5) 2.5 mV/µA ITH/RUN Sourcing 5µA (Note 5) 2.5 mV/µA VFB Input Current (Note 5) 10 50 nA Overvoltage Protect Threshold Measured at VFB 0.820 0.860 0.895 V Overvoltage Protect Hysteresis 20 mV Oscillator Frequency VFB = 0.8V 500 550 650 kHz VFB = 0V 120 kHz Gate Drive Rise Time CLOAD = 3000pF 40 ns Gate Drive Fall Time CLOAD = 3000pF 40 ns Peak Current Sense Voltage (Note 6) 120 mV
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
Dynamic supply current is higher due to the gate charge being of a device may be impaired. delivered at the switching frequency.
Note 2:
The LTC1874E is guaranteed to meet performance specifications
Note 5:
Each controller in the LTC1874 is individually tested in a feedback from 0°C to 70°C. Specifications over the –40°C to 85°C operating loop that servos VFB to the output of the error amplifier. temperature range are assured by design, characterization and correlation
Note 6:
Peak current sense voltage is reduced dependent upon duty cycle with statistical process controls. to a percentage of value as given in Figure 2.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA°C/W) 2
