LTC4078XEDD-TRPBF 查看數據表（PDF） - Linear Technology

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LTC4078XEDD-TRPBF

Dual Input Li-Ion Battery Charger with Overvoltage Protection

Linear Technology 

LTC4078/LTC4078X

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

temperature range, otherwise specifications are at TA = 25°C. VDCIN = 5V, VUSBIN = 5V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

VIDC

VIUSB

ITERMINATE

ITRIKL

VTRIKL

IDC Pin Regulated Voltage

IUSB Pin Regulated Voltage

Charge Current Termination Threshold

Trickle Charge Current (Note 6)

Trickle Charge Threshold (Note 6)

Constant-Current Mode

Constant-Current Mode

RITERM = 1k

RITERM = 2k

RITERM = 10k

RITERM = 20k

VBAT < VTRIKL; RIDC = 1.25k

VBAT < VTRIKL; RIUSB = 2.1k

VBAT Rising

Hysteresis

1

V

1

V

l 90

100

110

mA

l 42

50

58

mA

l

8

10

12

mA

l 3.5

5

6.5

mA

60

80

100

mA

30

47.5

65

mA

2.8

2.9

3

V

100

mV

VUVDC

DCIN Undervoltage Lockout Voltage

From Low to High

Hysteresis

4

4.15

4.3

V

190

mV

VUVUSB

USBIN Undervoltage Lockout Voltage From Low to High

Hysteresis

3.8

3.95

4.1

V

170

mV

VOVDC

DCIN Overvoltage Lockout Voltage

From Low to High

Hysteresis

5.8

6

6.2

V

185

mV

VOVUSB

USBIN Overvoltage Lockout Voltage

From Low to High

Hysteresis

5.8

6

6.2

V

185

mV

VASD-DC

VASD-USB

VENABLE

RENABLE

VBDET

IBATDET

VBOC

VOL

VDCIN – VBAT Lockout Threshold

VUSBIN – VBAT Lockout Threshold

ENABLE Input Threshold Voltage

ENABLE Pulldown Resistance

BATDET Input Threshold Voltage

BATDET Pull-Up Current

BATDET Open Circuit Voltage

Output Low Voltage

(CHRG, PWR)

VDCIN from Low to High, VBAT = 4.2V

VDCIN from High to Low, VBAT = 4.2V

VUSBIN from Low to High

VUSBIN from High to Low

From Low to High

VBATDET = 0V

ISINK = 5mA

70

120

170

mV

10

40

70

mV

70

120

170

mV

10

40

70

mV

0.6

0.9

1.2

V

l

1

2

3.5

MΩ

1.25 1.75

2

V

2

4

6

μA

4

4.2

4.4

V

0.12 0.35

V

ΔVRECHRG

tRECHRG

tTERMINATE

RON-DC

Recharge Battery Threshold Voltage

Recharge Comparator Filter Time

Termination Comparator Filter Time

Power FET “ON” Resistance

(Between DCIN and BAT)

VFLOAT – VRECHRG, 0°C < TA < 85°C

VBAT from High to Low

IBAT Drops Below Termination Threshold

90

125

160

mV

2.25

4.1

6.75

ms

1

1.6

2.4

ms

600

mΩ

RON-USB

Power FET “ON” Resistance

(Between USBIN and BAT)

700

mΩ

TLIM

Junction Temperature in Constant-

Temperature Mode

120

°C

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC4078/LTC4078X are guaranteed to meet the performance

specifications from 0°C to 85°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 3: Failure to correctly solder the exposed backside of the package to

the PC board will result in a thermal resistance much higher than 40°C/W.

See Thermal Considerations.

Note 4: Supply current includes IDC and ITERM pin current (approximately

100μA each) but does not include any current delivered to the battery

through the BAT pin.

Note 5: Supply current includes IUSB and ITERM pin current

(approximately 100μA each) but does not include any current delivered to

the battery through the BAT pin.

Note 6: This parameter is not applicable to the LTC4078X.

4078xfb

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