LTC3445 datasheet(2/24 Pages) LINER

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LTC3445

3445fa

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/

ORDER PART NUMBER

(Note 1)

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

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

LTC3445EUF

TJMAX = 125°C, θJA = 37°C/W, θJC = 2.6°C/W

EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB

24 23 22 21 20 19

TOP VIEW

UF PACKAGE

24-LEAD (4mm

× 4mm) PLASTIC QFN

10 11 12

VTRACK

VBACKUP

VCC1

PGOOD

ADD7

SDA

VCC BATT

RUN

The

● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC1 = VCC2 = 3.6V, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

UF PART MARKING

3445

VCC1, VCC2, SDA, SCL Voltages .................. –0.3V to 6V

RUN, VTRACK, VBACKUP, PGOOD, ADD7,

ADD6, FB, VCC BATT,

BATTFAULT Voltages .............................. – 0.3V to VCC1

SW Voltage ................................ – 0.3V to (VCC1 + 0.3V)

LDO1FB, LDO2FB Voltages ..................... – 0.3V to VCC2

LDO1, LDO2 Voltages ................ – 0.3V to (VCC2 + 0.3V)

LDO1, LDO2 Source Current ............................... 50mA

VCC BATT Source Current ...................................... 8mA

P-Channel Switch Source Current (DC) ............. 800mA

N-Channel Switch Sink Current (DC) ................. 800mA

Peak SW Sink and Source Current ........................ 1.3A

LDO1, LDO2, VCC BATT Output Short-Circuit

Duration .......................................................... Indefinite

Operating Temperature Range (Note 2) ...–40

°C to 85°C

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

°C

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

°C to 125°C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC1, VCC2

Input Voltage Range

●

2.5

5.5

RUN

Run Threshold

●

0.3

1.5

PGOOD

Reports Undervoltage of any Regulator

PGOOD = 0.4V

●

3mA

DC Bias Current (Shutdown)

RUN = 0

µA

DC Bias Current (Buck, LDO1, LDO2 Disabled)

RUN = VCC1

105

150

µA

Buck Regulator

RFB

Feedback Resistance

340

Ω

VOUT(MIN)

Regulated Output Voltage

IOUT = 100mA, Burst Mode Operation

●

0.824

0.850

0.875

Disabled

VOUT(MAX)

Regulated Output Voltage

IOUT = 100mA, Burst Mode Operation

●

1.504

1.55

1.597

Disabled

VOUT(STEP)

Output Voltage Step Size (0 to 48)

IOUT = 100mA

●

13.1

14.7

16.1

Output Voltage Slew Rate = 00

IOUT = 100mA, VOUT = 0.85V to 1.55V

11.3

mV/

µs

Output Voltage Slew Rate = 01

IOUT = 100mA, VOUT = 0.85V to 1.55V

7.5

mV/

µs

Output Voltage Slew Rate = 10

IOUT = 100mA, VOUT = 0.85V to 1.55V

3.8

mV/

µs

Output Voltage Slew Rate = 11

IOUT = 100mA, VOUT = 0.85V to 1.55V

0.9

mV/

µs

IPK

Peak Inductor Current

VCC1 = 3V, VFB = 0.5V or VOUT = 90%,

0.75

1.25

Duty Cycle < 35%

VLOADREG

Output Voltage Load Regulation

0.5

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