Datasheet LTC1735-1 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | High Efficiency Synchronous Step-Down Switching Regulator |
| Pages / Page | 28 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 356 Kb |
| Document Language | English |
ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LTC1735-1
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Supply Voltage (VIN).. 36V to –0.3V TOP VIEW ORDER PART Topside Driver Supply Voltage (BOOST)... 42V to – 0.3V C 1 16 OSC TG NUMBER Switch Voltage (SW) ... 36V to – 5V RUN/SS 2 15 BOOST INTV LTC1735CGN-1 CC, EXTVCC (BOOST, SW) Voltages ... 7V to – 0.3V I 3 14 TH SW SENSE+, SENSE–, LTC1735CS-1 PGOOD 4 13 VIN PGOOD Voltages .. 1.1(INTV SENSE– 5 12 INTV LTC1735IGN-1 CC + 0.3V) to – 0.3V CC I SENSE+ 6 11 BG LTC1735IS-1 TH, VOSENSE, COSC Voltages ... 2.7V to – 0.3V RUN/SS Voltage ..(INTV V 7 10 OSENSE PGND CC + 0.3V) to – 0.3V GN PART Peak Driver Output Current <10µs (TG, BG) .. 3A SGND 8 9 EXTVCC MARKING INTVCC Output Current ... 50mA GN PACKAGE S PACKAGE 16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO Operating Ambient Temperature Range 17351 TJMAX = 125°C, θJA = 130°C/W (GN) LTC1735C-1 .. 0°C to 85°C 1735I1 TJMAX = 125°C, θJA = 110°C/W (S) LTC1735I-1 .. – 40°C to 85°C Consult factory for Military grade parts. Junction Temperature (Note 2) ... 125°C Storage Temperature Range ... – 65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
IVOSENSE Feedback Current (Note 3) – 4 – 25 nA VOSENSE Feedback Voltage (Note 3) ● 0.792 0.8 0.808 V ∆VLINEREG Reference Voltage Line Regulation VIN = 3.6V to 30V (Note 3) 0.001 0.02 %/V ∆VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; VITH = 0.7V ● 0.1 0.3 % Measured in Servo Loop; VITH = 2V ● – 0.1 – 0.3 % DF Max Maximum Duty Factor In Dropout 98 99.4 % gm Transconductance Amplifier gm 1.3 mmho VOVL Feedback Overvoltage Lockout ● 0.84 0.86 0.88 V IQ Input DC Supply Current (Note 5) Normal Mode 3.6V < VIN < 30V 450 µA Shutdown VRUN/SS = 0V 15 25 µA VRUN/SS Run Pin Start Threshold VRUN/SS, Ramping Positive 1.0 1.5 1.9 V Run Pin Begin Latchoff Threshold VRUN/SS, Ramping Positive 4.1 4.5 V IRUN/SS Soft-Start Charge Current VRUN/SS = 0V – 0.7 – 1.2 µA ISCL RUN/SS Discharge Current Soft Short Condition, VOSENSE = 0.5V, 0.5 2 4 µA VRUN/SS = 4.5V UVLO Undervoltage Lockout Measured at VIN Pin (Ramping Negative) ● 3.5 3.9 V ∆VSENSE(MAX) Maximum Current Sense Threshold VOSENSE = 0.7V ● 60 75 85 mV I – + SENSE SENSE Pins Total Source Current VSENSE = VSENSE = 0V 60 80 µA tON(MIN) Minimum On-Time Tested with a Square Wave (Note 4) 160 200 ns 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Supply Voltage (VIN).. 36V to –0.3V TOP VIEW ORDER PART Topside Driver Supply Voltage (BOOST)... 42V to – 0.3V C 1 16 OSC TG NUMBER Switch Voltage (SW) ... 36V to – 5V RUN/SS 2 15 BOOST INTV LTC1735CGN-1 CC, EXTVCC (BOOST, SW) Voltages ... 7V to – 0.3V I 3 14 TH SW SENSE+, SENSE–, LTC1735CS-1 PGOOD 4 13 VIN PGOOD Voltages .. 1.1(INTV SENSE– 5 12 INTV LTC1735IGN-1 CC + 0.3V) to – 0.3V CC I SENSE+ 6 11 BG LTC1735IS-1 TH, VOSENSE, COSC Voltages ... 2.7V to – 0.3V RUN/SS Voltage ..(INTV V 7 10 OSENSE PGND CC + 0.3V) to – 0.3V GN PART Peak Driver Output Current <10µs (TG, BG) .. 3A SGND 8 9 EXTVCC MARKING INTVCC Output Current ... 50mA GN PACKAGE S PACKAGE 16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO Operating Ambient Temperature Range 17351 TJMAX = 125°C, θJA = 130°C/W (GN) LTC1735C-1 .. 0°C to 85°C 1735I1 TJMAX = 125°C, θJA = 110°C/W (S) LTC1735I-1 .. – 40°C to 85°C Consult factory for Military grade parts. Junction Temperature (Note 2) ... 125°C Storage Temperature Range ... – 65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
IVOSENSE Feedback Current (Note 3) – 4 – 25 nA VOSENSE Feedback Voltage (Note 3) ● 0.792 0.8 0.808 V ∆VLINEREG Reference Voltage Line Regulation VIN = 3.6V to 30V (Note 3) 0.001 0.02 %/V ∆VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; VITH = 0.7V ● 0.1 0.3 % Measured in Servo Loop; VITH = 2V ● – 0.1 – 0.3 % DF Max Maximum Duty Factor In Dropout 98 99.4 % gm Transconductance Amplifier gm 1.3 mmho VOVL Feedback Overvoltage Lockout ● 0.84 0.86 0.88 V IQ Input DC Supply Current (Note 5) Normal Mode 3.6V < VIN < 30V 450 µA Shutdown VRUN/SS = 0V 15 25 µA VRUN/SS Run Pin Start Threshold VRUN/SS, Ramping Positive 1.0 1.5 1.9 V Run Pin Begin Latchoff Threshold VRUN/SS, Ramping Positive 4.1 4.5 V IRUN/SS Soft-Start Charge Current VRUN/SS = 0V – 0.7 – 1.2 µA ISCL RUN/SS Discharge Current Soft Short Condition, VOSENSE = 0.5V, 0.5 2 4 µA VRUN/SS = 4.5V UVLO Undervoltage Lockout Measured at VIN Pin (Ramping Negative) ● 3.5 3.9 V ∆VSENSE(MAX) Maximum Current Sense Threshold VOSENSE = 0.7V ● 60 75 85 mV I – + SENSE SENSE Pins Total Source Current VSENSE = VSENSE = 0V 60 80 µA tON(MIN) Minimum On-Time Tested with a Square Wave (Note 4) 160 200 ns 2
