LTC3705IGN datasheet(2/20 Pages) LINER

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LTC3705

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

GND

VSLMT

UVLO

SSFLT

NDRV

FB/IN+

FS/IN–

BOOST

VCC

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

VCCLR

Output Voltage

Linear Regulator in Operation

INDRV

Current into NDRV Pin

Linear Regulator in Operation

0.1

tr(VCC)

Rise Time of VCC

Linear Regulator Charging (0.5V to 7.5V)

µs

INDRVTO

Linear Regulator Time Out Current Threshold

Primary-Side Operation

0.27

ICC

Supply Current

VUVLO = 1.5V, Linear Regulator in

1.4

2.1

Operation (Note 3)

ICCM

Maximum Supply Current

VUVLO = 1.5V, Trickle Charger in Operation,

1.7

2.5

VCC = 13.2V (Note 3)

VCCSR

Maximum Supply Voltage

Trickle Charger Shunt Regulator

14.25

ICCSR

Minimum Current into NDRV/VCC

Trickle Charger Shunt Regulator, VCC = 15V

(Note 3)

Internal Undervoltage

VCCUV

Internal Undervoltage Threshold

VCC Rising

5.3

VCC Falling

4.7

Gate Drive Undervoltage

VGDUV

Gate Drive Undervoltage Threshold

VCC Rising (Linear Regulator)

●

7.2

7.4

7.7

VCC Rising (Trickle Charger)

●

13.1

13.4

VCC Falling

●

6.8

7.0

7.2

Undervoltage Lockout (UVLO)

VUVLOR

Undervoltage Lockout Threshold Rising

Rising

●

1.220

1.242

1.280

VUVLOF

Undervoltage Lockout Threshold Falling

Falling

●

1.205

1.226

1.265

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