LTC3554-3_15,LTC3554-3_15 pdf中文资料,LTC3554-3_15引脚图,LTC3554-3

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

Micropower USB Power

Manager with Li-Ion Charger

and Two Step-Down Regulators

DescripTion

The LTC

®

3554 family* are micropower, highly integrated

power management and battery charger ICs for single-cell

Li-Ion/Polymer battery applications. They include a

PowerPath™ manager with automatic load prioritization,

a battery charger, an ideal diode and numerous internal

protection features. Designed specifically for USB applica-

tions, the LTC3554 power managers automatically limit

input current to a maximum of either 100mA or 500mA.

Battery charge current is automatically reduced such that

the sum of the load current and the charge current does

not exceed the selected input current limit.

The LTC3554 also includes two synchronous step-down

switching regulators as well as a pushbutton controller.

With all supplies enabled in standby mode, the quiescent

current drawn from the battery is only 10μA. The LTC3554

family are available in a 3mm

×

3mm

×

0.75mm 20-lead

QFN package.

L,

LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

and PowerPath, Hot Swap and Bat-Track are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Protected by U.S. Patents,

including 6522118, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390.

*See table on page 2 for available options.

FeaTures

n

10μA Standby Mode Quiescent Current (All Outputs On)

Seamless Transition Between Input Power Sources:

Li-Ion/Polymer Battery and USB

240mΩ Internal Ideal Diode

Dual High Efficiency Step-Down Switching Regulators

(200mA I

OUT

) with Adjustable Output Voltages

Pushbutton On/Off Control with System Reset

Reset Time: 5 sec (LTC3554/LTC3554-1),

14 sec (LTC3554-2/LTC3554-3)

Full Featured Li-Ion/Polymer Battery Charger

Programmable Charge Current with Thermal Limiting

Instant-On Operation with Discharged Battery

Battery Float Voltage: 4.2V (LTC3554/LTC3554-2/

LTC3554-3), 4.1V (LTC3554-1)

3mm

×

3mm

×

0.75mm 20-Lead QFN Package

applicaTions

n

USB-Based Handheld Products

Portable Li-Ion/Polymer Based Electronic Devices

Fitness Computers

Low Power Medical Devices

Typical applicaTion

4.35V TO 5.5V

USB INPUT

100k

10µF

V

BUS

NTC

100k

T

PROG

1.87k

HPWR

SUSP

BVIN

V

OUT

LTC3554

CHRG

BAT

10µF

SYSTEM

LOAD

Battery Drain Current

vs Temperature

14

BATTERY DRAIN CURRENT (µA)

V

BAT

= 3.8V

STBY = 3.8V

12 REGULATORS LOAD = 0mA

BOTH REGULATORS

10 ENABLED

8

6

4

2

HARD RESET

0

–75 –50 –25 0

25 50 75

TEMPERATURE (°C)

100 125

3554 TA01b

+

Li-Ion

BATTERY

2.2µF

4.7µH

PWR_ON1

SW1

10pF

2.05M

649k

10µH

SW2

10pF

FB2

3554 TA01a

3.3V

200mA

10µF

ONE REGULATOR ENABLED

BOTH REGULATORS DISABLED

FSEL

STBY

PGOOD

PWR_ON2

PBSTAT

ON

ON/OFF

FB1

1.2V

200mA

332k

649k

10µF

3554123ff

1

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

absoluTe MaxiMuM raTings

V

BUS

, V

OUT

, BVIN

t < 1ms and Duty Cycle < 1% ................... –0.3V to 7V

Steady State ............................................ –0.3V to 6V

BAT, NTC,

CHRG,

SUSP, PBSTAT,

ON,

PGOOD, FB1, FB2 .................................. –0.3V to 6V

PWR_ON1, PWR_ON2, STBY

HPWR, FSEL (Note 4) ......................–0.3V to V

CC

+ 0.3V

I

BAT

.............................................................................1A

I

SW1

, I

SW2

(Continuous) ...................................... 300mA

I

CHRG

, I

PGOOD,

I

PBSTAT

............................................75mA

Operating Junction Temperature Range ...–40°C to 85°C

Junction Temperature ............................................110°C

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

(Notes 1, 2, 3)

pin conFiguraTion

TOP VIEW

PROG

15 NTC

21

GND

14

CHRG

13 SW1

12 BVIN

11 SW2

6

FB1

7

FB2

8

PWR_ON2

9 10

PWR_ON1

STBY

SUSP

V

BUS

V

OUT

BAT

20 19 18 17 16

HPWR 1

FSEL 2

PBSTAT 3

PGOOD 4

ON

5

UD PACKAGE

20-LEAD (3mm

×

3mm) PLASTIC QFN

T

JMAX

= 110°C,

θ

JA

= 58.7°C/W

EXPOSED PAD (PIN 21) IS GND, AND MUST BE SOLDERED TO PCB GND

orDer inForMaTion

LEAD FREE FINISH

LTC3554EUD#PBF

LTC3554EUD-1#PBF

LTC3554EUD-2#PBF

LTC3554EUD-3#PBF

LTC3554EPD#PBF

TAPE AND REEL

LTC3554EUD#TRPBF

LTC3554EUD-1#TRPBF

LTC3554EUD-2#TRPBF

LTC3554EUD-3#TRPBF

LTC3554EPD#TRPBF

PART MARKING

LDYS

LGFG

LFZX

LGHK

FDPT

PACKAGE DESCRIPTION

20-Lead (3mm

×

3mm) Plastic QFN

20-Lead (3mm

×

3mm) Plastic QFN

20-Lead (3mm

×

3mm) Plastic QFN

20-Lead (3mm

×

3mm) Plastic QFN

20-Lead (3mm

×

3mm) Plastic UTQFN

TEMPERATURE RANGE

–40°C to 85°C

(OBSOLETE)

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

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/

LTC3554 Options

PART NUMBER

LTC3554

LTC3554-1

LTC3554-2

LTC3554-3

FLOAT

VOLTAGE

4.2V

4.1V

4.2V

HARD

RESET TIME SEQUENCING

5 seconds

Yes (Buck1

→

Buck2)

Yes (Buck1

→

Buck2)

14 seconds Yes (Buck1

→

Buck2)

14 seconds No (Buck1 and Buck2

Together)

2

3554123ff

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

power Manager elecTrical characTerisTics

SYMBOL

PARAMETER

No-Load Quiescent Currents

Battery Drain Current

I

BATQ

CONDITIONS

I

OUT

= 0 (Note 5)

V

BUS

= 0V (Hard Reset)

V

BUS

= 0V

V

BUS

= 0V, PWR_ON1 = PWR_ON2 = 3.8V

V

BAT

= V

FLOAT

, Timer Timed Out

100mA, 500mA Modes

SUSP = 5V (Suspend Mode)

V

BVIN

= 3.8V, V

BUS

= 0V (Note 8)

PWR_ON1 = STBY = 3.8V

PWR_ON1 = PWR_ON2 = STBY = 3.8V

PWR_ON1 = 3.8V, STBY = 0V

PWR_ON1 = PWR_ON2 = 3.8V, STBY = 0V

4.35

80

400

3.5

0

The

l

denotes specifications that

apply over the full operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2), V

BUS

= 5V, V

BAT

= 3.8V,

HPWR = SUSP = PWR_ON1 = PWR_ON2 = 0V, R

PROG

= 1.87k, STBY = High, unless otherwise noted.

MIN

TYP

MAX

UNITS

I

BATQC

I

BUSQ

I

BVINQ

Battery Drain Current, V

BUS

Available

V

BUS

Input Current

0.2

3

6.5

5

300

15

0.01

1.5

3

18

36

2

5

12

8

500

30

1

3

6

35

70

5.5

100

500

3.9

300

µA

V

mA

V

mV

mΩ

BVIN Input Current

Shutdown Input Current

One Buck Enabled, Standby Mode

Both Bucks Enabled, Standby Mode

One Buck Enabled

Both Bucks Enabled

Input Power Supply

V

BUS

Input Supply Voltage

Total Input Current

I

BUS(LIM)

V

UVLO

V

DUVLO

V

BUS

Undervoltage Lockout

V

BUS

to BAT Differential Undervoltage

Lockout

Input Current Limit Power FET

R

ON_ILIM

On-Resistance (Between V

BUS

and V

OUT

)

Battery Charger

V

BAT

Regulated Output Voltage

V

FLOAT

HPWR = 0V (100mA)

HPWR = 5V (500mA)

Rising Threshold

Falling Threshold

Rising Threshold

Falling Threshold

l

90

450

3.8

3.6

200

50

350

I

CHG

V

PROG

V

PROG,TRKL

h

PROG

I

TRKL

V

TRKL

ΔV

RECHRG

t

TERM

t

BADBAT

h

C/10

R

ON_CHG

T

LIM

NTC

V

COLD

V

HOT

Constant-Current Mode Charge Current

PROG Pin Servo Voltage

PROG Pin Servo Voltage in Trickle Charge

Ratio of I

BAT

to PROG Pin Current

Trickle Charge Current

Trickle Charge Threshold Voltage

Recharge Battery Threshold Voltage

Safety Timer Termination Period

Bad Battery Termination Time

End-of-Charge Indication Current Ratio

Battery Charger Power FET

On-Resistance (Between V

OUT

and BAT)

Junction Temperature in Constant

Temperature Mode

LTC3554/LTC3554-2/LTC3554-3

LTC3554/LTC3554-2/LTC3554-3, 0°C < T

A

< 85°C

LTC3554-1

LTC3554-1, 0°C < T

A

< 85°C

R

PROG

= 1.87k, 0 ≤ T

A

≤ 85°C

V

BAT

< V

TRKL

V

BAT

< V

TRKL

V

BAT

Rising

V

BAT

Falling

Threshold Voltage Relative to V

FLOAT

Timer Starts when V

BAT

= V

FLOAT

– 50mV

V

BAT

< V

TRKL

(Note 6)

I

BAT

= 200mA

4.179

4.165

4.079

4.065

380

30

2.6

–75

3.2

0.4

0.085

4.2

4.1

400

1

0.1

750

40

2.9

2.75

–100

4

0.5

0.1

220

110

4.221

4.235

4.121

4.135

420

50

3

–115

5

0.63

0.115

V

mA

V

mA/mA

mA

V

mV

Hour

mA/mA

mΩ

°C

Cold Temperature Fault Threshold Voltage Rising NTC Voltage

Hysteresis

Hot Temperature Fault Threshold Voltage Falling NTC Voltage

Hysteresis

75

34

76

1.3

35

1.3

77

36

%V

BUS

%V

BUS

%V

BUS

%V

BUS

3554123ff

3

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

power Manager elecTrical characTerisTics

SYMBOL

V

DIS

PARAMETER

NTC Disable Threshold Voltage

CONDITIONS

Falling NTC Voltage

Hysteresis

V

NTC

= V

BUS

= 5V

(Note 12)

I

OUT

= 200mA, V

BUS

= 0V

(Note 7)

The

l

denotes specifications that

apply over the full operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2), V

BUS

= 5V, V

BAT

= 3.8V,

HPWR = SUSP = PWR_ON1 = PWR_ON2 = 0V, R

PROG

= 1.87k, STBY = High, unless otherwise noted.

l

MIN

1.2

–50

TYP

1.7

50

MAX

2.2

50

NTC Leakage Current

I

NTC

Ideal Diode

Forward Voltage Detection

V

FWD

R

DROPOUT

Diode On-Resistance, Dropout

Diode Current Limit

I

MAX

Logic Inputs (HPWR, SUSP)

Input Low Voltage

V

IL

Input High Voltage

V

IH

Internal Pull-Down Resistance

R

PD

Logic Output (CHRG)

Output Low Voltage

V

OL

Output Hi-Z Leakage Current

I

CHRG

UNITS

%V

BUS

mV

nA

mV

mΩ

A

15

240

1

0.4

1.2

4

V

MΩ

mV

µA

I

CHRG

= 5mA

V

BAT

= 4.5V, V

CHRG

= 5V

65

0

250

1

swiTching regulaTor elecTrical characTerisTics

SYMBOL

PARAMETER

BVIN

Input Supply Voltage

V

OUT

UVLO V

OUT

Falling

V

OUT

Rising

f

OSC

Oscillator Frequency

CONDITIONS

(Note 9)

BVIN Connected to V

OUT

Through Low

Impedance. V

OUT

UVLO Disables the Switching

Regulators.

FSEL High

FSEL Low

l

The

l

denotes

specifications that apply over the full operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2).

V

OUT

= BVIN = 3.8V, PWR_ON1 = PWR_ON2 = 0V, unless otherwise noted.

MIN

2.7

2.5

1.91

0.955

–0.05

TYP

2.6

2.8

2.25

1.125

MAX

5.5

2.9

2.59

1.295

0.05

UNITS

V

MHz

µA

kΩ

V

µA

mA

mV

%

Ω

mV

mA

mV

FB1 Input Current (Note 8)

I

FB1

I

FB2

FB2 Input Current (Note 8)

SW1 Pull-Down in Shutdown

PWR_ON1 = 0V

R

SW1_PD

R

SW2_PD

SW2 Pull-Down in Shutdown

PWR_ON2 = 0V

Logic Input Pins (FSEL, STBY)

Input High Voltage

Input Low Voltage

Input Current

Switching Regulator 1 in Normal Operation (STBY Low)

Peak PMOS Current Limit

PWR_ON1 = 3.8V (Note 7)

I

LIM1

Regulated Feedback Voltage

PWR_ON1 = 3.8V

V

FB1

D1

Max Duty Cycle

R

DS(ON)

of PMOS

I

SW1

= 100mA

R

P1

R

DS(ON)

of NMOS

I

SW1

= –100mA

R

N1

Switching Regulator 1 in Standby Mode (STBY High)

PWR_ON1 = 3.8V, V

FB1

Falling

V

FB1_LOW

Feedback Voltage Threshold

I

SHORT1_SB

Short-Circuit Current

PWR_ON1 = 2.9V, I

SW1

= 5mA, V

FB1

= 0.77V,

V

DROP1_SB

Standby Mode Dropout Voltage

V

OUT

= 2.9V, BVIN = 2.9V

10

1.2

–1

300

780

100

450

800

1.1

0.7

l

0.4

1

600

820

l

770

10

800

21

25

820

50

60

4

3554123ff

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

swiTching regulaTor elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

Switching Regulator 2 in Normal Operation (STBY Low)

Peak PMOS Current Limit

PWR_ON2 = 3.8V (Note 7)

I

LIM2

l

Regulated Feedback Voltage

PWR_ON2 = 3.8V

V

FB2

D2

Max Duty Cycle

R

DS(ON)

of PMOS

I

SW2

= 100mA

R

P2

R

DS(ON)

of NMOS

I

SW2

= –100mA

R

N2

Switching Regulator 2 in Standby Mode (STBY High)

l

PWR_ON2 = 3.8V, V

FB2

Falling

V

FB2_LOW

Feedback Voltage Threshold

I

SHORT2_SB

Short-Circuit Current

PWR_ON2 = 2.9V, I

SW2

= 5mA, V

FB2

= 0.77V, V

OUT

V

DROP2_SB

Standby Mode Dropout Voltage

= 2.9V, BVIN = 2.9V

MIN

300

780

100

The

l

denotes

specifications that apply over the full operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2).

V

OUT

= BVIN = 3.8V, PWR_ON1 = PWR_ON2 = 0V, unless otherwise noted.

TYP

450

800

1.1

0.7

770

10

800

21

25

820

50

60

MAX

600

820

UNITS

mA

mV

%

Ω

mV

mA

mV

pushbuTTon inTerFace elecTrical characTerisTics

SYMBOL

PARAMETER

Pushbutton Pin (ON)

Pushbutton Operating Supply Range

V

CC_PB

ON

Threshold Rising

V

ON_TH

ON

Threshold Falling

ON

Input Current

I

ON

Pushbutton Pull-Up Resistance

R

PB_PU

Logic Input Pins (PWR_ON1, PWR_ON2)

V

PWR_ONx

PWR_ONx Threshold Rising

PWR_ONx Threshold Falling

PWR_ONx Input Current

I

PWR_ONx

Status Output Pins (PBSTAT, PGOOD)

PBSTAT Output High Leakage Current

I

PBSTAT

PBSTAT Output Low Voltage

V

PBSTAT

PGOOD Output High Leakage Current

I

PGOOD

PGOOD Output Low Voltage

V

PGOOD

V

THPGOOD

PGOOD Threshold Voltage

Pushbutton Timing Parameters (Note 11)

t

ON_PBSTATL

Minimum

ON

Low Time to Cause PBSTAT

Low

Delay from

ON

High to PBSTAT High

t

ON_

PBSTATH

The

l

denotes

specifications that apply over the full operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2).

V

BAT

= 3.8V, unless otherwise noted.

CONDITIONS

(Notes 4 , 9)

l

MIN

2.7

0.4

–1

200

TYP

MAX

5.5

1.2

1

650

1.2

1

0.4

1

0.4

UNITS

V

µA

kΩ

V

µA

V

µA

V

%

ms

µs

ms

V

ON

= V

CC

(Note 4)

Pull-Up to V

CC

(Note 4)

400

0.4

–1

V

PBSTAT

= 3V

I

PBSTAT

= 3mA

V

PGOOD

= 3V

I

PGOOD

= 3mA

(Note 10)

ON

Brought Low During Power-On (PON) or

Power-Up (PUP1, PUP2) States

Power-On (PON) State, After PBSTAT Has Been

Low for at Least t

PBSTAT_PW

Starting in the Hard Reset (HR) or Power-Off

(POFF) States

ON

Brought Low During the Power-On (PON)or

Power-Up (PUP1, PUP2) States

LTC3554/LTC3554-1

LTC3554-2/LTC3554-3

Power-On (PON) or Power-Up (PUP1, PUP2)

States

–1

0.1

–1

0.1

–8

50

900

400

t

ON_PUP

t

ON_HR

Minimum

ON

Low Time to Enter

Power-Up (PUP1 or PUP2) State

Minimum

ON

Low Time to Hard Reset

t

PBSTAT_PW

PBSTAT Minimum Pulse Width

4

11

40

5

14

50

6

17

s

ms

3554123ff

5

LTC3554-3_15

LTC3554-3_15概述

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