LTC3455EUF datasheet(2/24 Pages) LINER

2 / 24 page

LTC3455

3455f

VBAT, VMAX, USB Voltages ...........................– 0.3V to 6V

SW1, SW2 Voltages .................... – 0.3V to (VMAX+0.3V)

TIMER Voltage ............................. – 0.3V to (VMAX+0.3V)

PWRON, ON, ON2, HSON Voltages .............– 0.3V to 6V

PBSTAT, RST, CHRG, AO Voltages .............. – 0.3V to 6V

HSI, HSO Voltages .......................................– 0.3V to 6V

MODE, USBHP, SUSPEND Voltages ............– 0.3V to 6V

WALLFB, AI, PROG Voltages .......................– 0.3V to 2V

FB1, FB2 Voltages ........................................– 0.3V to 2V

Junction Temperature ........................................... 125

°C

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

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

°C to 125°C

ORDER PART

NUMBER

UF PART

MARKING

TJMAX = 125°C, θJA = 36°C/W, θJC = 2.5°C/W

EXPOSED PAD (PIN 25) IS GND

MUST BE SOLDERED TO PCB

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

3455

LTC3455EUF

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

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

temperature range, otherwise specifications are at TA = 25°C. VBAT = 3.6V, VMAX = 3.6V, VPWRON = 2V, VON is open, VON2 = 0V,

VUSB = 0V, VWALLFB = 0V unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Battery Undervoltage Lockout Voltage

VBAT Rising

2.9

3.0

3.2

Battery Undervoltage Lockout Hysteresis

450

VBAT Pin Quiescent Current (Note 3)

Burst Mode, Battery Powered

VON2 = VMODE = 1V, Not Switching

110

160

µA

PWM Mode, Battery Powered

VON2 = 1V, VMODE = 0V, Not Switching

500

800

µA

USB Powered

VUSB = 5V, Charger Off

µA

Wall Powered

VWALL = 1.5V, VMAX = 4.5V, Charger Off

µA

Shutdown

VPWRON = 0V, VMAX = 0V

µA

ON Pin Threshold

0.8

1.0

PWRON Pin Threshold

0.8

1.0

ON2 Pin Threshold

0.8

1.0

MODE Pin Threshold

0.8

1.0

WALLFB Pin Threshold Voltage

WALLFB Rising

1.20

1.23

1.26

WALLFB Pin Hysteresis

ON Pin Pullup Current

VON = 1V

2.5

µA

PWRON Pin Pulldown Current

VPWRON = 1V

2.5

µA

ON2 Pin Pulldown Current

VON2 = 1V

2.5

µA

MODE Pin Pullup Current

VMODE = 1V

2.5

µA

WALLFB Pin Input Bias Current

VWALLFB = 1.35V

±1

±30

PBSTAT Pin Low Voltage

VON = 0V, IPBSTAT = 100µA

0.02

0.10

VON = 0V, IPBSTAT = 1mA

0.20

0.35

RST Pin Low Voltage

IRST = 100µA

0.02

0.10

IRST = 1mA

0.20

0.35

RST Pulse Duration

After FB1 and FB2 in Regulation

200

23 22 21 20 19

TOP VIEW

UF PACKAGE

24-LEAD (4mm

× 4mm) PLASTIC QFN

10 11 12

FB1

PROG

TIMER

CHRG

USBHP

SUSPEND

FB2

HSON

HSO

HSI

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