Datasheet LTC1874 (Analog Devices) - 2

HerstellerAnalog Devices
BeschreibungDual Constant Frequency Current Mode Step-Down DC/DC Controller
Seiten / Seite12 / 2 — ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1)
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DokumentenspracheEnglisch

ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1)

ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)

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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