LTC3705_15 datasheet(2/20 Pages) LINER

Part #	LTC3705

Description	2-Switch Forward Controller and Gate Driver

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3705

2

3705fb

Power Supply (VCC) ...................................– 0.3V to 15V

External NMOS Drive (NDRV) ....................– 0.3V to 20V

NDRV to VCC ........................................................... – 0.3V to 5V

Bootstrap Supply (BOOST) ...................... – 0.3V to 115V

Top Source (TS) .......................................... -5V to 100V

BOOST to TS .............................................– 0.3V to 15V

Soft-Start Fault, Feedback,

Frequency Set, Transformer

Inputs (SSFLT, FB/IN+, FS/IN–) ..................– 0.3V to 15V

All Other Pins (VSLMT, IS, UVLO) .................– 0.3V to 5V

Peak Output Current <1

µs (TG, BG)........................... 2A

Operating Ambient Temperature Range .. – 40

°C to 85°C

Operating Junction Temperature (Note 2) ............ 125

°C

Storage Temperature Range ................. – 65

°C to 150°C

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

°C

ORDER PART

NUMBER

TJMAX = 125°C, θJA = 110°C/W

LTC3705EGN

LTC3705IGN

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

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

temperature range, otherwise specifications are at TA = 25°C. VCC = VBOOST = 12V, GND = PGND = VTS = 0V, TA = 25°C, unless

otherwise noted.

Consult LTC Marketing for parts specified with wider operating temperature ranges.

TOP VIEW

GN PACKAGE

16-LEAD NARROW PLASTIC SSOP

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

GND

IS

VSLMT

UVLO

SSFLT

NDRV

FB/IN+

FS/IN–

TS

TG

BOOST

NC

VCC

BG

PGND

GN PART

MARKING

3705

3705I

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/

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC Supply, Linear Regulator and Trickle Charger Shunt Regulator

VCCOP

Operating Voltage Range

7

12

15

V

VCCLR

Output Voltage

Linear Regulator in Operation

8

V

INDRV

Current into NDRV Pin

Linear Regulator in Operation

0.1

1

mA

tr(VCC)

Rise Time of VCC

Linear Regulator Charging (0.5V to 7.5V)

45

µs

INDRVTO

Linear Regulator Time Out Current Threshold

Primary-Side Operation

0.27

mA

ICC

Supply Current

VUVLO = 1.5V, Linear Regulator in

1.4

2.1

mA

Operation (Note 3)

ICCM

Maximum Supply Current

VUVLO = 1.5V, Trickle Charger in Operation,

1.7

2.5

mA

VCC = 13.2V (Note 3)

VCCSR

Maximum Supply Voltage

Trickle Charger Shunt Regulator

14.25

15

V

ICCSR

Minimum Current into NDRV/VCC

Trickle Charger Shunt Regulator, VCC = 15V

10

mA

(Note 3)

Internal Undervoltage

VCCUV

Internal Undervoltage Threshold

VCC Rising

5.3

V

VCC Falling

4.7

V

Gate Drive Undervoltage

VGDUV

Gate Drive Undervoltage Threshold

VCC Rising (Linear Regulator)

●

7.2

7.4

7.7

V

VCC Rising (Trickle Charger)

●

13.1

13.4

14

V

VCC Falling

●

6.8

7.0

7.2

V

Undervoltage Lockout (UVLO)

VUVLOR

Undervoltage Lockout Threshold Rising

Rising

●

1.220

1.242

1.280

V

VUVLOF

Undervoltage Lockout Threshold Falling

Falling

●

1.205

1.226

1.265

V

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