Datasheet LTC3867 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control |
| Pages / Page | 36 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 394 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
Model Line for this Datasheet
Text Version of Document
LTC3867
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VPG1(HYST) PGOOD Trip Level Hysteresis 2 % VPG2 PGOOD 2nd Trip Level—No Delay VFB with Respect to Set Output Voltage VFB Ramping Up 17 % VFB Ramping Down –25 % VPG2(HYST) PGOOD 2nd Trip Level Hysteresis 5 %
INTVCC Linear Regulator
VINTVCC Linear Regulator Voltage 6V < VIN < 38V 5.1 5.3 5.5 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.5 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 50 70 mV VLDO(HYS) EXTVCC Hysteresis 200 mV
Differential Amplifier
VDA DIFF+ Accuracy Measured in a Servo Loop with EA in Loop ITH =1.2V, 0°C to 85°C 595.5 600 604.5 mV ITH =1.2V, –40°C to 125°C l 594 600 606 mV IDIFF+ Input Bias Current DIFF+ to SGND –200 200 nA f0dB DA Unity-Gain Crossover Frequency (Note 7) 4 MHz IOUT(SINK) Maximum Sinking Current DIFFOUT = 600mV 100 µA IOUT(SOURCE) Maximum Sourcing Current DIFFOUT = 600mV 500 µA
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency RFREQ < 23.2kΩ 150 kHz RFREQ = 30.1kΩ 250 kHz RFREQ = 47.5kΩ 600 kHz RFREQ = 54.9kΩ 750 kHz RFREQ = 75.0kΩ 1.05 MHz Maximum Frequency 1.2 MHz Minimum Frequency 0.2 MHz IFREQ FREQ Pin Output Current VFREQ = 0.8V 19 20 21 µA RMODE/PLLIN MODE/PLLIN Input Resistance 250 kΩ
On-Chip Driver
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω 3867f 4 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VPG1(HYST) PGOOD Trip Level Hysteresis 2 % VPG2 PGOOD 2nd Trip Level—No Delay VFB with Respect to Set Output Voltage VFB Ramping Up 17 % VFB Ramping Down –25 % VPG2(HYST) PGOOD 2nd Trip Level Hysteresis 5 %
INTVCC Linear Regulator
VINTVCC Linear Regulator Voltage 6V < VIN < 38V 5.1 5.3 5.5 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.5 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 50 70 mV VLDO(HYS) EXTVCC Hysteresis 200 mV
Differential Amplifier
VDA DIFF+ Accuracy Measured in a Servo Loop with EA in Loop ITH =1.2V, 0°C to 85°C 595.5 600 604.5 mV ITH =1.2V, –40°C to 125°C l 594 600 606 mV IDIFF+ Input Bias Current DIFF+ to SGND –200 200 nA f0dB DA Unity-Gain Crossover Frequency (Note 7) 4 MHz IOUT(SINK) Maximum Sinking Current DIFFOUT = 600mV 100 µA IOUT(SOURCE) Maximum Sourcing Current DIFFOUT = 600mV 500 µA
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency RFREQ < 23.2kΩ 150 kHz RFREQ = 30.1kΩ 250 kHz RFREQ = 47.5kΩ 600 kHz RFREQ = 54.9kΩ 750 kHz RFREQ = 75.0kΩ 1.05 MHz Maximum Frequency 1.2 MHz Minimum Frequency 0.2 MHz IFREQ FREQ Pin Output Current VFREQ = 0.8V 19 20 21 µA RMODE/PLLIN MODE/PLLIN Input Resistance 250 kΩ
On-Chip Driver
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω 3867f 4 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts
