SC820

5

Electrical Characteristics (continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Thermal Limiting Threshold Tempera-

ture

T

TL

130

°C

Thermal Limiting Rate

i

T

T

J

> T

TL

-50

mA/ °C

ENB Input High Voltage

V

IH

1.6

V

ENB Input Mid Voltage

V

IM

0.7

1.3

V

ENB Input Low Voltage

V

IL

0.3

V

ENB Input High-range Threshold

Input Current

I

IH_TH

ENB current required to pull ENB from

floating midrange into high range

23

50

μA

ENB Input High-range Sustain Input

Current

I

IH_SUS

Current required to hold ENB in

high range, Min V

IH

≤ V

ENB

≤ V

BAT

,

Min V

IH

≤ V

BAT

≤ 4.2V

0.3

1

μA

ENB Input Mid-range Load Limit

I

IM

Input will float to mid range when this

load limit is observed.

-5

5

μA

ENB Input Low-range Input Current

I

IL

0V ≤ V

ENB

≤ Max V

IL

-25

-12

μA

ENB Input Leakage

I

ILEAK

V

VIN

= 0V, V

ENB

= V

BAT

= 4.2V

1

μA

STATB Output Low Voltage

V

STAT_LO

I

STAT_SINK

= 2mA

0.5

V

STATB Output High Current

I

STAT_HI

V

STAT

= 5V

1

μA

Notes:

(1)

Sustained operation to VT

ADsel-F

≤ V

VAD

is guaranteed only if a current limited charging source applied to VAD is pulled below VT

ADsel-R

by the

charging load; forced VAD voltage below VT

ADsel-R

may in some cases result in regulation errors or other unexpected behavior.

(2)

If VAD is the selected input but V

VAD

< V

VUSB

, such as when VAD is operating with an adapter in current limit while a VUSB charging source is

applied, Iq

VUSB_DES

will increase to approximately Iq

VUSB_EN

.

(3)

At load currents exceeding 700mA, or at 700mA while at elevated ambient temperature, the charger may enter dropout with a 5V input before

the battery voltage has risen to V

CV

. See the specification of V

DO_AD

. Although this is a safe and acceptable mode of operation, specification of

V

CV

when in dropout is not applicable; higher input voltage will restore the charger to CV regulation in these cases. Note that V

BAT

is always

less than V

CV

while in dropout. As the battery state-of-charge increases, the charging current will decrease allowing the battery voltage to rise

to V

CV

, and CV regulation will begin. This appears as a softening or rounding of the CC-to-CV regulation mode transition, similar to that seen

in chargers with a linear CC-to-CV regulation crossover.