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LTC1980

1980f

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

VREG to GND ............................................. –0.5V to 12V

VBAT to GND ............................................. –0.5V to 12V

PROG, ISENSE .............................................. –0.5V to 5V

PROGT, REGFB, VC, BATT1, BATT2

TIMER, SS ............................................ –0.5V to VBIAS2

LDOFB, LDODRV .................................... –0.5V to VREG

WA, VBIAS1, REG ....................................... –0.5V to 12V

MODE ................................................... –0.5V to VBIAS1

VBIAS2 ......................................................... –0.5V to 5V

OVP ............................................................ –0.5V to 5V

PGND to GND .................................... Connect Together

Operating Ambient Temperature Range

(Note 2) ................................................. – 40°C to 85°C

Storage Temperature Range ................. – 65°C to 125°C

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

(Note 1)

ORDER PART

NUMBER

TOP VIEW

GN PACKAGE

24-LEAD NARROW PLASTIC SSOP

OVP

CAOUT

ISENSE

GND

VBIAS2

VBAT

TIMER

MODE

REG

BGTDR

VBIAS1

PROG

PROGT

REGFB

LDOFB

LDODRV

VREG

BATT1

BATT2

RGTDR

PGND

LTC1980EGN

TJMAX = 125°C, θJA = 85°C/W

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

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VBAT

Positive Supply Voltage, VBAT

2.85

VREG

Positive Supply Voltage, VREG

2.85

VFB

Feedback Voltage

REGFB Tied to VC

●

1.194

1.225

1.256

VPROGT

Voltage on PROGT Pin

PROGT Tied to VC

1.194

1.225

1.256

IBURST

Burst Mode Operation

Regulator Mode, REGFB = 1.5V

0.75

Supply Current, Quiescent, VREG

IHIGH

Supply Current, Quiescent, VREG

Regulator Mode, REGFB = 0V

●

4.3

ISHDN

Supply Current in Shutdown Mode, VREG

Mode = 0V

µA

VUVL

Positive-Going Undervoltage Lockout Voltage

From Either VBAT or VREG

2.45

2.7

2.85

VUVHYS

Undervoltage Lockout Hysteresis

From Either VBAT or VREG

100

ISS

Soft-Start Ramp Current

BATT1 = 0, BATT2 = 0, Charger Mode

µA

VFLOAT0

Output Float Voltage in Constant Voltage Mode

BATT1 = 0, BATT2 = 0

●

4.059

4.1

4.141

VFLOAT1

Output Float Voltage in Constant Voltage Mode

BATT1 = 1, BATT2 = 0

●

4.158

4.2

4.242

VFLOAT2

Output Float Voltage in Constant Voltage Mode

BATT1 = 0, BATT2 = 1 (Note 3)

●

8.118

8.2

8.282

VFLOAT3

Output Float Voltage in Constant Voltage Mode

BATT1 = 1, BATT2 = 1 (Note 3)

●

8.316

8.4

8.484

VFLOAT4

Output Float Voltage in Constant Voltage Mode

BATT1 = Open, BATT2 = Don’t Care

●

1.207

1.225

1.243

Measured from OVP Input

VRCHG0

Recharge Threshold, Delta Voltage with Respect

BATT2 = 0, BATT1 = 0 or 1

200

to Float Voltage

VRCHG1

Recharge Threshold, Delta Voltage with Respect

BATT2 = 1, BATT1 = 0 or 1

400

to Float Voltage

The

● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VBAT = 2.4V, VREG = 5V, VBAT unloaded.

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