Datasheet LTC3445 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN |
| Pages / Page | 24 / 2 — ABSOLUTE AXI U RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). Order … |
| File Format / Size | PDF / 486 Kb |
| Document Language | English |
ABSOLUTE AXI U RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). Order Options. ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LTC3445
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
TOP VIEW VCC1, VCC2, SDA, SCL Voltages .. –0.3V to 6V RUN, VTRACK, VBACKUP, PGOOD, ADD7, CC2 LDO2FB LDO2 V LDO1 LDO1FB BATTFAULT ADD6, FB, VCC BATT, 24 23 22 21 20 19 BATTFAULT Voltages .. – 0.3V to VCC1 V 1 18 TRACK VCC BATT SW Voltage .. – 0.3V to (VCC1 + 0.3V) VBACKUP 2 17 FB LDO1FB, LDO2FB Voltages ... – 0.3V to VCC2 VCC1 3 16 NC 25 LDO1, LDO2 Voltages .. – 0.3V to (VCC2 + 0.3V) PGOOD 4 15 RUN LDO1, LDO2 Source Current ... 50mA ADD7 5 14 SW V SDA 6 13 NC CC BATT Source Current .. 8mA P-Channel Switch Source Current (DC) ... 800mA 7 8 9 10 11 12 N-Channel Switch Sink Current (DC) ... 800mA NC SCL CC1 NC ADD6 V GND Peak SW Sink and Source Current .. 1.3A UF PACKAGE 24-LEAD (4mm LDO1, LDO2, V × 4mm) PLASTIC QFN CC BATT Output Short-Circuit TJMAX = 125°C, θJA = 37°C/W, θJC = 2.6°C/W Duration .. Indefinite EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB Operating Temperature Range (Note 2) ...–40°C to 85°C Junction Temperature (Note 3) .. 125°C ORDER PART NUMBER UF PART MARKING Storage Temperature Range ... –65°C to 125°C LTC3445EUF 3445
Order Options
Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC1 = VCC2 = 3.6V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VCC1, VCC2 Input Voltage Range ● 2.5 5.5 V RUN Run Threshold ● 0.3 1 1.5 V PGOOD Reports Undervoltage of any Regulator PGOOD = 0.4V ● 3 mA IS DC Bias Current (Shutdown) RUN = 0 27 50 µA DC Bias Current (Buck, LDO1, LDO2 Disabled) RUN = VCC1 105 150 µA
Buck Regulator
RFB Feedback Resistance 340 kΩ VOUT(MIN) Regulated Output Voltage IOUT = 100mA, Burst Mode Operation ● 0.824 0.850 0.875 V Disabled VOUT(MAX) Regulated Output Voltage IOUT = 100mA, Burst Mode Operation ● 1.504 1.55 1.597 V Disabled VOUT(STEP) Output Voltage Step Size (0 to 48) IOUT = 100mA ● 13.1 14.7 16.1 mV Output Voltage Slew Rate = 00 IOUT = 100mA, VOUT = 0.85V to 1.55V 11.3 mV/µs Output Voltage Slew Rate = 01 IOUT = 100mA, VOUT = 0.85V to 1.55V 7.5 mV/µs Output Voltage Slew Rate = 10 IOUT = 100mA, VOUT = 0.85V to 1.55V 3.8 mV/µs Output Voltage Slew Rate = 11 IOUT = 100mA, VOUT = 0.85V to 1.55V 0.9 mV/µs IPK Peak Inductor Current VCC1 = 3V, VFB = 0.5V or VOUT = 90%, 0.75 1 1.25 A Duty Cycle < 35% VLOADREG Output Voltage Load Regulation 0.5 % 3445fa 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
TOP VIEW VCC1, VCC2, SDA, SCL Voltages .. –0.3V to 6V RUN, VTRACK, VBACKUP, PGOOD, ADD7, CC2 LDO2FB LDO2 V LDO1 LDO1FB BATTFAULT ADD6, FB, VCC BATT, 24 23 22 21 20 19 BATTFAULT Voltages .. – 0.3V to VCC1 V 1 18 TRACK VCC BATT SW Voltage .. – 0.3V to (VCC1 + 0.3V) VBACKUP 2 17 FB LDO1FB, LDO2FB Voltages ... – 0.3V to VCC2 VCC1 3 16 NC 25 LDO1, LDO2 Voltages .. – 0.3V to (VCC2 + 0.3V) PGOOD 4 15 RUN LDO1, LDO2 Source Current ... 50mA ADD7 5 14 SW V SDA 6 13 NC CC BATT Source Current .. 8mA P-Channel Switch Source Current (DC) ... 800mA 7 8 9 10 11 12 N-Channel Switch Sink Current (DC) ... 800mA NC SCL CC1 NC ADD6 V GND Peak SW Sink and Source Current .. 1.3A UF PACKAGE 24-LEAD (4mm LDO1, LDO2, V × 4mm) PLASTIC QFN CC BATT Output Short-Circuit TJMAX = 125°C, θJA = 37°C/W, θJC = 2.6°C/W Duration .. Indefinite EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB Operating Temperature Range (Note 2) ...–40°C to 85°C Junction Temperature (Note 3) .. 125°C ORDER PART NUMBER UF PART MARKING Storage Temperature Range ... –65°C to 125°C LTC3445EUF 3445
Order Options
Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC1 = VCC2 = 3.6V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VCC1, VCC2 Input Voltage Range ● 2.5 5.5 V RUN Run Threshold ● 0.3 1 1.5 V PGOOD Reports Undervoltage of any Regulator PGOOD = 0.4V ● 3 mA IS DC Bias Current (Shutdown) RUN = 0 27 50 µA DC Bias Current (Buck, LDO1, LDO2 Disabled) RUN = VCC1 105 150 µA
Buck Regulator
RFB Feedback Resistance 340 kΩ VOUT(MIN) Regulated Output Voltage IOUT = 100mA, Burst Mode Operation ● 0.824 0.850 0.875 V Disabled VOUT(MAX) Regulated Output Voltage IOUT = 100mA, Burst Mode Operation ● 1.504 1.55 1.597 V Disabled VOUT(STEP) Output Voltage Step Size (0 to 48) IOUT = 100mA ● 13.1 14.7 16.1 mV Output Voltage Slew Rate = 00 IOUT = 100mA, VOUT = 0.85V to 1.55V 11.3 mV/µs Output Voltage Slew Rate = 01 IOUT = 100mA, VOUT = 0.85V to 1.55V 7.5 mV/µs Output Voltage Slew Rate = 10 IOUT = 100mA, VOUT = 0.85V to 1.55V 3.8 mV/µs Output Voltage Slew Rate = 11 IOUT = 100mA, VOUT = 0.85V to 1.55V 0.9 mV/µs IPK Peak Inductor Current VCC1 = 3V, VFB = 0.5V or VOUT = 90%, 0.75 1 1.25 A Duty Cycle < 35% VLOADREG Output Voltage Load Regulation 0.5 % 3445fa 2
