LTC1876 Ver la hoja de datos (PDF) - Linear Technology

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LTC1876

High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator

Linear Technology 

LTC1876

ABSOLUTE AXI U RATI GS

(Note 1)

Input Supply Voltage (VIN)......................... 36V to –0.3V

Topside Driver Voltages

(BOOST1, BOOST2) ................................... 42V to –0.3V

Switch Voltage (SW1, SW2) ......................... 36V to –5V

INTVCC, EXTVCC, RUN/SS1, RUN/SS2, PGOOD,

(BOOST1-SW1), (BOOST2-SW2), ...............7V to – 0.3V

SENSE1+, SENSE2+, SENSE1–, SENSE2–

Voltages ................................... (1.1)INTVCC to – 0.3V

FREQSET, STBYMD, FCB, PGOOD

Voltages ..................................................7V to – 0.3V

ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages ... 2.7V to –0.3V

Peak Output Current <10µs (TG1, TG2, BG1, BG2) ... 3A

INTVCC Peak Output Current ................................ 50mA

AUXVIN .................................................................. 16V to –0.3V

AUXSD ..................................................................... 10V

AUXSW ..................................................... 36V to –0.3V

AUXVFB Voltage ....................................... 2.5V to –0.3V

Current into AUXVFB ....................................................... ±1mA

Operating Temperature Range (Note 2) ...–40°C to 85°C

Junction Temperature (Note 3) ............................. 125°C

Storage Temperature Range ..................–65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

UW U

PACKAGE/ORDER I FOR ATIO

RUN/SS1 1

SENSE1+ 2

SENSE1– 3

VOSENSE1 4

FREQSET 5

STBYMD 6

FCB 7

ITH1 8

SGND 9

3.3VOUT 10

IITH2 11

VOSENSE2 12

SENSE2– 13

SENSE2+ 14

AUXSGND 15

AUXVFB 16

AUXSW 17

AUXSW 18

TOP VIEW

36 PGOOD

35 TG1

34 SW1

33 BOOST1

32 VIN

31 BG1

30 EXTVCC

29 INTVCC

28 PGND

27 BG2

26 BOOST2

25 SW2

24 TG2

23 RUN/SS2

22 AUXSD

21 AUXVIN

20 AUXPGND

19 AUXPGND

G PACKAGE

36-LEAD PLASTIC SSOP

TJMAX = 125°C, θJA = 95°C/W

ORDER PART

NUMBER

LTC1876EG

Consult factory for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V, AUXVIN = 3V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Main Control Loops

VOSENSE1, 2

IVOSENSE1, 2

VREFLNREG

VLOADREG

gm1, 2

gmOL1, 2

IQ

VFCB

IFCB

VBINHIBIT

Regulated Feedback Voltage

Feedback Current

ITH1, 2 Voltage = 1.2V (Note 4)

(Note 4)

q 0.792

Reference Voltage Line Regulation VIN = 3.6V to 30V (Note 4)

Output Voltage Load Regulation (Note 4)

Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V q

Measured in Servo Loop; ∆ITH Voltage = 1.2V to 2V q

Transconductance Amplifier gm

ITH1, 2 = 1.2V; Sink/Source 5µA; (Note 4)

Transconductance Amplifier GBW ITH1, 2 = 1.2V; (Note 4)

Input DC Supply Current

Normal Mode

Standby

Shutdown

(Note 5)

VIN = 15V; EXTVCC Tied to VOUT1; VOUT1 = 5V

VRUN/SS1, 2 = 0V, VSTBYMD > 2V

VRUN/SS1, 2 = 0V, VSTBYMD = Open

Forced Continuous Threshold

q 0.76

Forced Continuous Current

VFCB = 0.85V

– 0.3

Burst Inhibit (Constant Frequency) Measured at FCB pin

Threshold

0.800

–5

0.002

0.1

– 0.1

1.3

3

350

125

20

0.800

– 0.18

4.3

0.808

–50

0.02

0.5

– 0.5

35

0.84

– 0.1

4.8

V

nA

%/V

%

%

mmho

MHz

µA

µA

µA

V

µA

V

1876fa

2

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