Datasheet LTC3861-1 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing |
| Pages / Page | 38 / 4 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| File Format / Size | PDF / 1.3 Mb |
| Document Language | English |
e lecTrical characTerisTics The. denotes the specifications which apply over the specified operating
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LTC3861-1
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = 5V, VCLKIN = 0V, VFB = 0.6V, fOSC = 0.6MHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IISENSE SENSE Pin Input Current VCM = 1.5V 100 nA VOS Current Sense Input Referred Offset –40°C to 125°C l –1.25 1.25 mV
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency VCLKIN = 0V VFREQ = 0V l 360 400 440 kHz VFREQ = 5V l 540 600 660 kHz VCLKIN = 5V RFREQ < 24.9k 200 kHz RFREQ = 36.5k 600 kHz RFREQ = 48.7k 1 MHz RFREQ = 64.9k 1.45 MHz RFREQ = 88.7k 2.1 MHz Maximum Frequency 3 MHz Minimum Frequency 0.25 MHz IFREQ FREQ Pin Output Current VFREQ = 0.8V 18.5 20 21.5 µA tCLKIN(HI) CLKIN Pulse Width High VCLKIN = 0V to 5V 100 ns tCLKIN(LO) CLKIN Pulse Width Low VCLKIN = 0V to 5V 100 ns RCLKIN CLKIN Pull-Up Resistance 13 kΩ VCLKIN CLKIN Input Threshold VCLKIN Falling 1.2 V VCLKIN Rising 2 V VFREQ FREQ Input Threshold VCLKIN = 0V VFREQ Falling 1.5 V VFREQ Rising 2.5 V VOL(CLKOUT) CLKOUT Low Output Voltage ILOAD = –500µA 0.2 V VOH(CLKOUT) CLKOUT High Output Voltage ILOAD = 500µA VCC – 0.2 V θ2-θ1 Channel 1-to-Channel 2 Phase Relationship VPHSMD = 0V 180 Deg VPHSMD = Float 180 Deg VPHSMD = VCC 120 Deg θCLKOUT-θ1 CLKOUT-to-Channel 1 Phase Relationship VPHSMD = 0V 60 Deg VPHSMD = Float 90 Deg VPHSMD = VCC 240 Deg
PWM/PWMEN Outputs
PWM PWM Output High Voltage ILOAD = 500µA l 4.5 V PWM Output Low Voltage ILOAD = –500µA l 0.5 V PWM Output Current in Hi-Z State ±5 µA PWM Maximum Duty Cycle 91.5 % PWMEN PWMEN Output High Voltage ILOAD = 1mA l 4.5 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings specifications from 0°C to 85°C junction temperature. Specifications over may cause permanent damage to the device. Exposure to any Absolute the –40°C to 125°C operating junction temperature range are assured Maximum Rating condition for extended periods may affect device by design, characterization and correlation with statistical process reliability and lifetime. controls. The LTC3861-1I is guaranteed over the full –40°C to 125°C
Note 2:
T operating junction temperature range. The maximum ambient temperature J is calculated from the ambient temperature TA and power dissipation P consistent with these specifications is determined by specific operating D according to the following formula: T conditions in conjunction with board layout, the rated package thermal J = TA + (PD • 34°C/W) resistors and other environmental factors.
Note 3:
The LTC3861-1 is tested under pulsed load conditions such that T
Note 4:
Guaranteed by design. J ≈ TA. The LTC3861-1E is guaranteed to meet performance 38611fb 4 For more information www.linear.com/LTC3861-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = 5V, VCLKIN = 0V, VFB = 0.6V, fOSC = 0.6MHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IISENSE SENSE Pin Input Current VCM = 1.5V 100 nA VOS Current Sense Input Referred Offset –40°C to 125°C l –1.25 1.25 mV
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency VCLKIN = 0V VFREQ = 0V l 360 400 440 kHz VFREQ = 5V l 540 600 660 kHz VCLKIN = 5V RFREQ < 24.9k 200 kHz RFREQ = 36.5k 600 kHz RFREQ = 48.7k 1 MHz RFREQ = 64.9k 1.45 MHz RFREQ = 88.7k 2.1 MHz Maximum Frequency 3 MHz Minimum Frequency 0.25 MHz IFREQ FREQ Pin Output Current VFREQ = 0.8V 18.5 20 21.5 µA tCLKIN(HI) CLKIN Pulse Width High VCLKIN = 0V to 5V 100 ns tCLKIN(LO) CLKIN Pulse Width Low VCLKIN = 0V to 5V 100 ns RCLKIN CLKIN Pull-Up Resistance 13 kΩ VCLKIN CLKIN Input Threshold VCLKIN Falling 1.2 V VCLKIN Rising 2 V VFREQ FREQ Input Threshold VCLKIN = 0V VFREQ Falling 1.5 V VFREQ Rising 2.5 V VOL(CLKOUT) CLKOUT Low Output Voltage ILOAD = –500µA 0.2 V VOH(CLKOUT) CLKOUT High Output Voltage ILOAD = 500µA VCC – 0.2 V θ2-θ1 Channel 1-to-Channel 2 Phase Relationship VPHSMD = 0V 180 Deg VPHSMD = Float 180 Deg VPHSMD = VCC 120 Deg θCLKOUT-θ1 CLKOUT-to-Channel 1 Phase Relationship VPHSMD = 0V 60 Deg VPHSMD = Float 90 Deg VPHSMD = VCC 240 Deg
PWM/PWMEN Outputs
PWM PWM Output High Voltage ILOAD = 500µA l 4.5 V PWM Output Low Voltage ILOAD = –500µA l 0.5 V PWM Output Current in Hi-Z State ±5 µA PWM Maximum Duty Cycle 91.5 % PWMEN PWMEN Output High Voltage ILOAD = 1mA l 4.5 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings specifications from 0°C to 85°C junction temperature. Specifications over may cause permanent damage to the device. Exposure to any Absolute the –40°C to 125°C operating junction temperature range are assured Maximum Rating condition for extended periods may affect device by design, characterization and correlation with statistical process reliability and lifetime. controls. The LTC3861-1I is guaranteed over the full –40°C to 125°C
Note 2:
T operating junction temperature range. The maximum ambient temperature J is calculated from the ambient temperature TA and power dissipation P consistent with these specifications is determined by specific operating D according to the following formula: T conditions in conjunction with board layout, the rated package thermal J = TA + (PD • 34°C/W) resistors and other environmental factors.
Note 3:
The LTC3861-1 is tested under pulsed load conditions such that T
Note 4:
Guaranteed by design. J ≈ TA. The LTC3861-1E is guaranteed to meet performance 38611fb 4 For more information www.linear.com/LTC3861-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Related Parts
