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LTC1709

2-Phase, 5-Bit Adjustable, High Efficiency, Synchronous Step-Down Switching Regulator

Linear Technology 

LTC1709

ABSOLUTE AXI U RATI GS

(Note 1)

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

Topside Driver Voltages (BOOST 1, 2) .......42V to – 0.3V

Switch Voltage (SW1, 2) .............................36V to – 5 V

SENSE 1+, SENSE 2 +, SENSE 1–,

SENSE 2 – Voltages ....................... (1.1)INTVCC to – 0.3V

EAIN, VOS+, VOS–, EXTVCC, INTVCC, RUN/SS,

AMPMD, VBIAS, ATTENIN, ATTENOUT,

VID0–VID4, Voltages ...................................7V to – 0.3V

Boosted Driver Voltage (BOOST-SW) ..........7V to – 0.3V

PLLFLTR, PLLIN, VDIFFOUT Voltages .... INTVCC to – 0.3V

ITH Voltage ................................................2.7V to – 0.3V

Peak Output Current <1µs(TGL1, 2; BG1, 2) .............. 3A

INTVCC RMS Output Current ................................ 50mA

Operating Ambient 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

RUNN/SS 1

SENSE 1+ 2

SENSE 1– 3

EAIN 4

PLLFLTR 5

PLLIN 6

NC 7

ITH 8

SGND 9

VDIFFOUT 10

VOS– 11

VOS+ 12

SENSE 2– 13

SENSE 2+ 14

ATTENOUT 15

ATTENIN 16

VID0 17

VID1 18

TOP VIEW

36 NC

35 TG1

34 SW1

33 BOOST 1

32 VIN

31 BG1

30 EXTVCC

29 INTVCC

28 PGND

27 BG2

26 BOOST 2

25 SW2

24 TG2

23 AMPMD

22 VBIAS

21 VID4

20 VID3

19 VID2

ORDER PART

NUMBER

LTC1709EG

G PACKAGE

36-LEAD PLASTIC SSOP

TJMAX = 125°C, θJA = 85°C/W

Consult factory for Industrial and Military grade parts.

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/SS = 5V unless otherwise noted.

SYMBOL PARAMETER

Main Control Loop

VEAIN

VSENSEMAX

IINEAIN

VLOADREG

Regulated Feedback Voltage

Maximum Current Sense Threshold

Feedback Current

Output Voltage Load Regulation

VREFLNREG

VOVL

UVLO

gm

gmOL

IQ

IRUN/SS

VRUN/SS

Reference Voltage Line Regulation

Output Overvoltage Threshold

Undervoltage Lockout

Transconductance Amplifier gm

Transconductance Amplifier Gain

Input DC Supply Current

Normal Mode

Shutdown

Soft-Start Charge Current

RUN/SS Pin ON Arming

CONDITIONS

MIN TYP MAX UNITS

(Note 4); ITH Voltage = 1.2V

VSENSE – = 5V

(Note 4)

q 0.792

q 62

(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

VIN = 3.6V to 30V (Note 4)

Measured at VEAIN

q 0.84

VIN Ramping Down

3

ITH = 1.2V; Sink/Source 5µA; (Note 4)

ITH = 1.2V; (gmxZL; No Ext Load); (Note 4)

(Note 5)

EXTVCC Tied to VOUT; VOUT = 5V

VRUN/SS = 0V

VRUN/SS = 1.9V

– 0.5

VRUN/SS Rising

1.0

0.800

75

–5

0.1

– 0.1

0.002

0.86

3.5

3

1.5

470

20

– 1.2

1.5

0.808

88

– 50

0.5

– 0.5

0.02

0.88

4

40

1.9

V

mV

nA

%

%

%/V

V

V

mmho

V/mV

µA

µA

µA

V

2

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