Datasheet LT3380 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | Multioutput Power Management Solution with 4 Buck Switching and 3 LDO Linear Regulators with I2C |
| Seiten / Seite | 28 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Dateiformat / Größe | PDF / 1.6 Mb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LT3380
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 = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = DVDD = 3.8V. All regulators disabled unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Supply Voltage, VIN l 2.7 5.5 V VIN Standby Current PWR_ON = 0V l 12 21 µA VIN Undervoltage Fault Rising (Note 7) l 2.55 2.65 V VIN Undervoltage Fault Falling l 2.35 2.45 V VIN Undervoltage Warning Falling CNTRL[4:2] = 000 (POR Default) 2.7 V CNTRL[4:2] = 001 2.8 V CNTRL[4:2] = 010 2.9 V CNTRL[4:2] = 011 3.0 V CNTRL[4:2] = 100 3.1 V CNTRL[4:2] = 101 3.2 V CNTRL[4:2] = 110 3.3 V CNTRL[4:2] = 111 3.4 V
Step-Down Switching Regulators 1, 2, 3 and 4
Output Voltage Range l VFB PVIN V Burst Mode® VIN Quiescent Current VFB_Bx = 850mV (Note 5) l 23 50 µA Pulse-Skipping Mode VIN Quiescent Current VFB_Bx = 850mV (Note 5) l 120 200 µA Forced Continuous VIN Quiescent Current VFB_Bx = 0V (Note 5) l 170 300 µA Feedback Pin Input Current VFB_Bx = 850mV –0.05 0.05 µA Maximum Duty Cycle VFB_Bx = 0V l 100 % Minimum Duty Cycle l 18 24 % SW Pull-Down Resistance Regulator Disabled 625 Ω Feedback Reference Soft-Start Rate (Note 6) 0.8 V/ms High Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 11111, l 788 800 812 mV VIN = 2.7V to 5.5V Default Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 11001, l 714 725 736 mV VIN = 2.7V to 5.5V Low Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 00000, l 404 412.5 421 mV VIN = 2.7V to 5.5V Feedback LSB Step Size 12.5 mV Switching Frequency BUCKx[2] = 0 l 1.7 2.25 2.7 MHz BUCKx[2] = 1 l 0.85 1.125 1.35 MHz
1.5A Step-Down Switching Regulators 3 and 4
PMOS Current Limit l 2.0 A PMOS On-Resistance 160 mΩ NMOS On-Resistance 80 mΩ
2.5A Step-Down Switching Regulators 1 and 2
PMOS Current Limit l 3.0 A PMOS On-Resistance 120 mΩ NMOS On-Resistance 70 mΩ
LDO Regulators 1, 2 and 3
Feedback Reference Soft-Start Rate 10 V/ms Output Pull-Down Resistance Regulator Disabled 625 Ω
LDO Regulators 1 and 2
VIN_Lx Input Voltage l 1.7 VIN V Output Voltage Range ILDO = 0mA VFB VIN_Lx V Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Slewing DAC Reference Operation Power On Sequencing Power Off Sequencing Fault Detectionand Reporting I2C Operation Applications Information Thermal Considerations and Board Layout Typical Applications 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 = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = DVDD = 3.8V. All regulators disabled unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Supply Voltage, VIN l 2.7 5.5 V VIN Standby Current PWR_ON = 0V l 12 21 µA VIN Undervoltage Fault Rising (Note 7) l 2.55 2.65 V VIN Undervoltage Fault Falling l 2.35 2.45 V VIN Undervoltage Warning Falling CNTRL[4:2] = 000 (POR Default) 2.7 V CNTRL[4:2] = 001 2.8 V CNTRL[4:2] = 010 2.9 V CNTRL[4:2] = 011 3.0 V CNTRL[4:2] = 100 3.1 V CNTRL[4:2] = 101 3.2 V CNTRL[4:2] = 110 3.3 V CNTRL[4:2] = 111 3.4 V
Step-Down Switching Regulators 1, 2, 3 and 4
Output Voltage Range l VFB PVIN V Burst Mode® VIN Quiescent Current VFB_Bx = 850mV (Note 5) l 23 50 µA Pulse-Skipping Mode VIN Quiescent Current VFB_Bx = 850mV (Note 5) l 120 200 µA Forced Continuous VIN Quiescent Current VFB_Bx = 0V (Note 5) l 170 300 µA Feedback Pin Input Current VFB_Bx = 850mV –0.05 0.05 µA Maximum Duty Cycle VFB_Bx = 0V l 100 % Minimum Duty Cycle l 18 24 % SW Pull-Down Resistance Regulator Disabled 625 Ω Feedback Reference Soft-Start Rate (Note 6) 0.8 V/ms High Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 11111, l 788 800 812 mV VIN = 2.7V to 5.5V Default Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 11001, l 714 725 736 mV VIN = 2.7V to 5.5V Low Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 00000, l 404 412.5 421 mV VIN = 2.7V to 5.5V Feedback LSB Step Size 12.5 mV Switching Frequency BUCKx[2] = 0 l 1.7 2.25 2.7 MHz BUCKx[2] = 1 l 0.85 1.125 1.35 MHz
1.5A Step-Down Switching Regulators 3 and 4
PMOS Current Limit l 2.0 A PMOS On-Resistance 160 mΩ NMOS On-Resistance 80 mΩ
2.5A Step-Down Switching Regulators 1 and 2
PMOS Current Limit l 3.0 A PMOS On-Resistance 120 mΩ NMOS On-Resistance 70 mΩ
LDO Regulators 1, 2 and 3
Feedback Reference Soft-Start Rate 10 V/ms Output Pull-Down Resistance Regulator Disabled 625 Ω
LDO Regulators 1 and 2
VIN_Lx Input Voltage l 1.7 VIN V Output Voltage Range ILDO = 0mA VFB VIN_Lx V Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Slewing DAC Reference Operation Power On Sequencing Power Off Sequencing Fault Detectionand Reporting I2C Operation Applications Information Thermal Considerations and Board Layout Typical Applications Package Description Typical Application Related Parts