LTC4088-2(RevB) View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4088-2
(Rev.:RevB)

High Efficiency Battery Charger/USB Power Manager with Regulated Output Voltage

Linear Technology 

LTC4088-1/LTC4088-2

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

temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, BAT = 3.8V, RCLPROG = 2.94k, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

IOUT

VOUT Current Available Before

1x Mode, BAT = 3.3V

Discharging Battery

5x Mode, BAT = 3.3V

10x Mode, BAT = 3.3V

Low Power Suspend Mode

High Power Suspend Mode

135

mA

672

mA

1251

mA

0.26

0.32

0.41

mA

1.6

2.04

2.46

mA

VCLPROG

CLPROG Servo Voltage in Current Limit 1x, 5x, 10x Modes

Suspend Modes

1.188

V

100

mV

VUVLO

VBUS Undervoltage Lockout

Rising Threshold

Falling Threshold

4.30

4.35

V

3.95

4.00

V

VDUVLO

VBUS to BAT Differential Undervoltage Rising Threshold

Lockout

Falling Threshold

200

mV

50

mV

VOUT

fOSC

RPMOS

VOUT Voltage

Switching Frequency

PMOS On Resistance

1x, 5x, 10x Modes, 0V < BAT ≤ 4.2V,

IOUT = 0mA, Battery Charger Off

USB Suspend Modes, IOUT = 250µA

3.5 BAT + 0.3 4.7

V

4.5

4.6

4.7

V

1.8

2.25

2.7

MHz

0.18

Ω

RNMOS

IPEAK

NMOS On Resistance

Peak Inductor Current Clamp

1x, 5x Modes

10x Mode

0.30

Ω

2

A

3

A

RSUSP

Suspend LDO Output Resistance

Battery Charger

15

Ω

VFLOAT

ICHG

IBAT

VPROG

VPROG,TRKL

BAT Regulated Output Voltage

Constant-Current Mode Charge Current

Battery Drain Current

PROG Pin Servo Voltage

PROG Pin Servo Voltage in Trickle

Charge

0°C ≤ TA ≤ 85°C

RPROG = 1k

RPROG = 5k

VBUS > VUVLO, PowerPath Switching

Regulator On, Battery Charger Off,

IOUT = 0µA

VBUS = 0V, IOUT = 0µA (Ideal Diode Mode)

BAT < VTRKL

4.179

4.200

4.221

V

4.165

4.200

4.235

V

980

1030

1080

mA

196

206

220

mA

3.5

5

µA

23

35

µA

1.000

V

0.100

V

hPROG

Ratio of IBAT to PROG Pin Current

1031

mA/mA

VTRKL

Trickle Charge Threshold Voltage

BAT Rising

2.7

2.85

3.0

V

∆VTRKL

VRECHRG

tTERM

tBADBAT

Trickle Charge Hysteresis Voltage

Recharge Battery Threshold Voltage

Safety Timer Termination Period

Bad Battery Termination Time

Threshold Voltage Relative to VFLOAT

Timer Starts when VBAT = VFLOAT

BAT < VTRKL

135

mV

–80

–100

–120

mV

3.2

4.0

4.8

Hour

0.4

0.5

0.6

Hour

IC/X

Battery Charge Current at Programmed RC/X = 1k

End of Charge Indication

RC/X = 5k

VC/X

C/X Threshold Voltage

85

100

115

mA

20

mA

100

mV

hC/X

VCHRG

ICHRG

Battery Charge Current Ratio to C/X

CHRG Pin Output Low Voltage

CHRG Pin Input Current

ICHRG = 5mA

BAT = 4.5V, VCHRG = 5V

1031

mA/mA

65

100

mV

0

1

µA

40881fb

3

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