LTC3555EUFD-3-PBF,LTC3555EUFD-3-PBF pdf中文资料,LTC3555EUFD-3-PBF引脚图,LTC3555EUFD-3-PBF电路-Datasheet-电子工程世界

FEATURES

Power Manager

n

High Efﬁciency Switching PowerPath™ Controller

with Bat-Track™ Adaptive Output Control

n

Programmable USB or Wall Current Limit

(100mA/500mA/1A)

n

Full Featured Li-Ion/Polymer Battery Charger

n

1.5A Maximum Charge Current

n

Internal 180mΩ Ideal Diode + External Ideal Diode

Controller Powers Load in Battery Mode

n

Low No-Load Quiescent Current when Powered from

BAT (<32μA)

DC/DCs

n

Triple High Efﬁciency Step-Down DC/DCs

(1A/400mA/400mA I

OUT

)

n

All Regulators Operate at 2.25MHz

n

Dynamic Voltage Scaling on Two Outputs

n

I

2

C or Independent Enable, V

OUT

Controls

n

Low No-Load Quiescent Current: 20μA

n

28-Pin (4mm

×

5mm

×

0.75mm) QFN Package

LTC3555/LTC3555-X

High Efﬁciency USB Power

Manager + Triple

Step-Down DC/DC

DESCRIPTION

The LTC

®

3555 family are highly integrated USB com-

patible power management and battery charger ICs for

Li-Ion/Polymer battery applications. They include a high

efﬁciency current limited switching PowerPath manager

with automatic load prioritization, a battery charger, an ideal

diode and three general purpose synchronous step-down

switching regulators.

The LTC3555 family limits input current to either 100mA

or 500mA for USB applications or 1A for adapter-powered

applications. Unlike linear chargers, the LTC3555 family’s

switching architecture transmits nearly all of the power avail-

able from the USB port to the load with minimal loss and

heat which eases thermal constraints in small spaces.

Two of the three general purpose switching regulators can

provide up to 400mA and the third can deliver 1A. The

entire product can be controlled via I

2

C or simple I/O. The

LTC3555-1/LTC3555-3 versions offer “instant-on” power

delivery to the portable product even with a very low battery

voltage. The LTC3555-3 version also has a reduced charger

ﬂoat voltage of 4.100V for battery safety and longevity.

The LTC3555 family is available in the low proﬁle 28-pin

(4mm

×

5mm

×

0.75mm) QFN surface mount package.

L,

LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath

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 and 6404251.

APPLICATIONS

n

HDD-Based MP3 Players, PDAs, GPS, PMPs

Portable Medical Products

Handheld Instrumentation

Other USB-Based Handheld Products

TYPICAL APPLICATION

High Efﬁciency PowerPath Manager and Triple Step-Down Regulator

USB/WALL

4.35V TO 5.5V

USB COMPLIANT

STEP-DOWN

REGULATOR

CURRENT

CONTROL

CHARGE

LTC3555/LTC3555-X

ALWAYS ON LDO

TRIPLE

HIGH EFFICIENCY

STEP-DOWN

SWITCHING

REGULATORS

I

2

C PORT

TO OTHER

LOADS

CC/CV

BATTERY

CHARGER

Switching Regulator Efﬁciency to

System Load (P

OUT

/P

BUS

)

100

90

80

0V

OPTIONAL

+

T

EFFICIENCY (%)

70

60

50

40

30

20

10

BAT = 4.2V

BAT = 3.3V

Li-Ion

3.3V/25mA

0.8V TO 3.6V/400mA

0.8V TO 3.6V/1A

RST

2

RTC/LOW

POWER LOGIC

MEMORY

I/O

CORE

μPROCESSOR

I

2

C

3555 TA01

1

2

3

ENABLE

CONTROLS

5

0

0.01

V

BUS

= 5V

I

BAT

= 0mA

10x MODE

0.1

I

OUT

(A)

1

3555 TA01b

3555fd

1

LTC3555/LTC3555-X

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 2, 3)

PIN CONFIGURATION

TOP VIEW

I

LIM1

I

LIM0

V

BUS

V

OUT

EN3

BAT

22 GATE

21

CHRG

20 PROG

29

19 FB1

18 V

IN1

17 SW1

16 EN1

15

RST3

9 10 11 12 13 14

V

IN3

SCL

SW3

SDA

FB3

SW

28 27 26 25 24 23

LDO3V3 1

CLPROG 2

NTC 3

FB2 4

V

IN2

5

SW2 6

EN2 7

DV

CC

8

V

BUS

(Transient) t < 1ms,

Duty Cycle < 1% .......................................... –0.3V to 7V

V

IN1

, V

IN2

, V

IN3

, V

BUS

(Static), DV

CC

,

FB1, FB2, FB3, NTC, BAT, EN1, EN2, EN3,

I

LIM0

, I

LIM1

, SCL, SDA,

RST3, CHRG

............ –0.3V to 6V

I

CLPROG

....................................................................3mA

I

RST3

, I

CHRG

............................................................50mA

I

PROG

........................................................................2mA

I

LDO3V3

...................................................................30mA

I

SW1

, I

SW2

............................................................600mA

I

SW

, I

SW3

, I

BAT

, I

VOUT

...................................................2A

Junction Temperature ........................................... 125°C

Operating Temperature Range (Note 2).... –40°C to 85°C

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

UFD PACKAGE

28-LEAD (4mm

×

5mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 37°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LTC3555EUFD#PBF

LTC3555IUFD#PBF

LTC3555EUFD-1#PBF

LTC3555IUFD-1#PBF

LTC3555EUFD-3#PBF

LTC3555IUFD-3#PBF

TAPE AND REEL

LTC3555EUFD#TRPBF

LTC3555IUFD#TRPBF

LTC3555EUFD-1#TRPBF

LTC3555IUFD-1#TRPBF

LTC3555EUFD-3#TRPBF

LTC3555IUFD-3#TRPBF

PART MARKING*

3555

35551

35553

PACKAGE DESCRIPTION

28-Lead (4mm x 5mm) Plastic QFN

TEMPERATURE RANGE

–40°C to 85°C

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed by a label on the shipping container.

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/

ELECTRICAL CHARACTERISTICS

SYMBOL

V

BUS

I

BUSLIM

PARAMETER

Input Supply Voltage

Total Input Current

PowerPath Switching Regulator

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

BUS

= 5V, BAT = 3.8V, DV

CC

= 3.3V, R

PROG

= 1k, R

CLPROG

= 3k,

unless otherwise noted.

CONDITIONS

MIN

4.35

1x Mode, V

OUT

= BAT

5x Mode, V

OUT

= BAT

10x Mode, V

OUT

= BAT

Suspend Mode, V

OUT

= BAT

1x Mode, I

OUT

= 0mA

5x Mode, I

OUT

= 0mA

10x Mode, I

OUT

= 0mA

Suspend Mode, I

OUT

= 0mA

l

TYP

MAX

5.5

UNITS

V

mA

3555fd

87

436

800

0.31

I

VBUSQ

V

BUS

Quiescent Current

95

460

860

0.38

7

15

0.044

100

500

1000

0.50

2

LTC3555/LTC3555-X

ELECTRICAL CHARACTERISTICS

SYMBOL

h

CLPROG

(Note 4)

PARAMETER

Ratio of Measured V

BUS

Current to

CLPROG Program Current

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

BUS

= 5V, BAT = 3.8V, DV

CC

= 3.3V, R

PROG

= 1k, R

CLPROG

= 3k,

unless otherwise noted.

CONDITIONS

1x Mode

5x Mode

10x Mode

Suspend Mode

1x Mode, BAT = 3.3V

5x Mode, BAT = 3.3V

10x Mode, BAT = 3.3V

Suspend Mode

1x, 5x, 10x Modes

Suspend Mode

Rising Threshold

Falling Threshold

Rising Threshold

Falling Threshold

1x, 5x, 10x Modes, 0V < BAT < 4.2V,

I

OUT

= 0mA, Battery Charger Off

USB Suspend Mode, I

VOUT

= 250μA

MIN

TYP

224

1133

2140

11.3

135

672

1251

0.32

1.188

100

4.30

4.00

200

50

BAT + 0.3

4.6

2.25

0.18

0.30

1x, 5x Modes

10x

LTC3555/LTC3555-1

LTC3555-3

R

PROG

= 1k

R

PROG

= 5k

V

BUS

> V

UVLO

, Battery Charger Off, I

VOUT

= 0μA

V

BUS

= 0V, I

VOUT

= 0μA (Ideal Diode Mode)

LTC3555

LTC3555-1/LTC3555-3

BAT < V

TRKL

4.179

4.165

4.079

l

4.065

980

185

2

l

MAX

UNITS

mA/mA

mA

V

mV

V

mV

V

MHz

Ω

A

I

OUT(POWERPATH)

V

OUT

Current Available Before

Loading BAT

V

CLPROG

V

UVLO_VBUS

V

UVLO_VBUS-BAT

V

OUT

CLPROG Servo Voltage in Current

Limit

V

BUS

Undervoltage Lockout

V

BUS

to BAT Differential Undervoltage

Lockout

V

OUT

Voltage

4.35

3.95

3.4

4.5

1.8

4.7

2.7

f

OSC

Switching Frequency

R

PMOS_POWERPATH

PMOS On Resistance

R

NMOS_POWERPATH

NMOS On Resistance

I

PEAK_POWERPATH

Battery Charger

V

FLOAT

BAT Regulated Output Voltage

Peak Switch Current Limit

2

3

4.200

4.100

1022

204

3.5

27

32

1.000

0.100

100

1022

4.221

4.235

4.121

4.135

1065

223

5

38

44

I

CHG

I

BAT

Constant Current Mode Charge

Current

Battery Drain Current

V

mA

μA

V

mV

mA/mA

mA

V

PROG

V

PROG_TRKL

V

C/10

h

PROG

I

TRKL

V

TRKL

ΔV

TRKL

ΔV

RECHRG

t

TERM

t

BADBAT

h

C/10

PROG Pin Servo Voltage

PROG Pin Servo Voltage in Trickle

Charge

C/10 Threshold Voltage at PROG

Ratio of I

BAT

to PROG Pin Current

Trickle Charge Current

Trickle Charge Threshold Voltage

Trickle Charge Hysteresis Voltage

Recharge Battery Threshold Voltage

Safety Timer Termination

Bad Battery Termination Time

Threshold Voltage Relative to V

FLOAT

Timer Starts when BAT = V

FLOAT

BAT < V

TRKL

–75

3.3

0.42

0.088

BAT < V

TRKL

BAT Rising

2.7

100

2.85

135

–100

4

0.5

0.1

–125

5

0.63

0.112

3.0

V

mV

Hour

mA/mA

End of Charge Indication Current Ratio (Note 5)

3555fd

3

LTC3555/LTC3555-X

ELECTRICAL CHARACTERISTICS

SYMBOL

V

CHRG

I

CHRG

R

ON_CHG

T

LIM

NTC

V

COLD

V

HOT

V

DIS

I

NTC

Ideal Diode

V

FWD

R

DROPOUT

I

MAX_DIODE

V

LDO3V3

R

CL_LDO3V3

R

OL_LDO3V3

V

IL

V

IH

I

PD1

I

2

C Port

DV

CC

I

DVCC

V

DVCC_UVLO

ADDRESS

V

IH

, SDA, SCL

V

IL

, SDA, SCL

I

PD2

SDA, SCL

V

OL

f

SCL

t

BUF

t

HD_STA

t

SU_STA

Input Supply Voltage

DV

CC

Current

DV

CC

UVLO

I

2

C Address

Input High Threshold

Input Low Threshold

Pull-Down Current

Digital Output Low (SDA)

Clock Operating Frequency

Bus Free Time Between Stop and Start

Condition

Hold Time After (Repeated) Start

Condition

Repeated Start Condition Setup Time

1.3

0.6

I

PULLUP

= 3mA

70

30

2

0.4

400

SCL/SDA = 0kHz

1.6

0.5

1.0

0001 001[0]

%DV

CC

%DV

CC

μA

V

kHz

μs

3555fd

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

BUS

= 5V, BAT = 3.8V, DV

CC

= 3.3V, R

PROG

= 1k, R

CLPROG

= 3k,

unless otherwise noted.

PARAMETER

CHRG

Pin Output Low Voltage

CHRG

Pin Leakage Current

Battery Charger Power FET On

Resistance (Between V

OUT

and BAT)

Junction Temperature in Constant

Temperature Mode

Cold Temperature Fault Threshold

Voltage

Hot Temperature Fault Threshold

Voltage

NTC Disable Threshold Voltage

NTC Leakage Current

Forward Voltage

Rising Threshold

Hysteresis

Falling Threshold

Hysteresis

Falling Threshold

Hysteresis

V

NTC

= V

BUS

= 5V

75.0

33.4

0.7

–50

2

15

0.18

1.6

0mA < I

LDO3V3

< 25mA

3.1

3.3

4

23

0.4

1.2

2

3.5

CONDITIONS

I

CHRG

= 5mA

V

CHRG

= 5V

0.18

110

MIN

TYP

65

MAX

100

1

UNITS

mV

μA

Ω

°C

76.5

1.5

34.9

1.5

1.7

50

78.0

36.4

2.7

50

%V

BUS

%V

BUS

%V

BUS

%V

BUS

%V

BUS

mV

nA

mV

Ω

A

V

Ω

V

μA

V

BUS

= 0V, I

VOUT

= 10mA

I

VOUT

= 10mA

Internal Diode On Resistance, Dropout V

BUS

= 0V

Internal Diode Current Limit

Regulated Output Voltage

Closed-Loop Output Resistance

Dropout Output Resistance

Logic Low Input Voltage

Logic High Input Voltage

I

LIM0

, I

LIM1

, EN1, EN2, EN3

Pull-Down Currents

Always On 3.3V LDO Supply

Logic (I

LIM0

, I

LIM1

, EN1, EN2, EN3)

5.5

V

μA

V

4

LTC3555/LTC3555-X

ELECTRICAL CHARACTERISTICS

SYMBOL

t

SU_STD

t

HD_DAT(OUT)

t

HD_DAT(IN)

t

SU_DAT

t

LOW

t

HIGH

t

f

t

r

t

SP

V

IN1,2,3

V

OUTUVLO

PARAMETER

Stop Condition Time

Data Hold Time

Input Data Hold Time

Data Setup Time

Clock Low Period

Clock High Period

Clock Data Fall Time

Clock Data Rise Time

Spike Suppression Time

Input Supply Voltage

V

OUT

UVLO—V

OUT

Falling

V

OUT

UVLO—V

OUT

Rising

Oscillator Frequency

FBx Input Current

Maximum Duty Cycle

SWx Pull-Down in Shutdown

Pulse Skip Mode Input Current

Burst Mode Input Current

Forced Burst Mode

®

Input Current

LDO Mode Input Current

Shutdown Input Current

PMOS Switch Current Limit

Available Output Current

I

OUT1

= 0μA (Note 6)

I

OUT1

= 0μA (Note 6)

I

OUT1

= 0μA (Note 6)

I

OUT1

= 0μA (Note 6)

I

OUT1

= 0μA, FB1 = 0V

Pulse Skip/Burst Mode Operation

Pulse Skip/Burst Mode Operation (Note 7)

Forced Burst Mode Operation (Note 7)

LDO Mode (Note 7)

(Note 8)

V

FB1,2,3

= 0.85V

V

IN1,2,3

Connected to V

OUT

Through Low

Impedance. Switching Regulators are Disabled in

UVLO

2.7

2.5

2.6

2.8

2.25

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

BUS

= 5V, BAT = 3.8V, DV

CC

= 3.3V, R

PROG

= 1k, R

CLPROG

= 3k,

unless otherwise noted.

CONDITIONS

MIN

0.6

225

0

100

1.3

0.6

20

300

50

5.5

2.9

2.7

50

10

225

35

20

600

400

60

50

0.78

800

900

TYP

MAX

UNITS

μs

ns

μs

ns

V

MHz

nA

%

kΩ

μA

mA

V

Ω

μA

mA

General Purpose Switching Regulators 1, 2 and 3

f

OSC

I

FB1,2,3

D

1,2,3

R

SW1,2,3_PD

I

VIN1

1.8

–50

100

General Purpose Switching Regulator 1

60

35

1

1100

I

LIMSW1

I

OUT1

V

FB1

R

P1

R

N1

R

LDO_CL1

R

LDO_OL1

I

VIN2

V

FB1

Servo Voltage

PMOS R

DS(ON)

NMOS R

DS(ON)

LDO Mode Closed-Loop R

OUT

LDO Mode Open-Loop R

OUT

Pulse Skip Mode Input Current

Burst Mode Input Current

Forced Burst Mode Input Current

LDO Mode Input Current

Shutdown Input Current

PMOS Switch Current Limit

Available Output Current

l

0.80

0.6

0.7

0.25

0.82

(Note 9)

I

OUT2

= 0μA (Note 6)

I

OUT2

= 0μA (Note 6)

I

OUT2

= 0μA (Note 6)

I

OUT2

= 0μA (Note 6)

I

OUT2

= 0μA, FB2 = 0V

Pulse Skip/Burst Mode Operation

Pulse Skip/Burst Mode Operation (Note 7)

Forced Burst Mode Operation (Note 7)

LDO Mode (Note 7)

2.5

225

35

20

600

400

60

50

800

General Purpose Switching Regulator 2

60

35

1

1100

I

LIMSW2

I

OUT2

Burst Mode is a registered trademark of Linear Technology Corporation.

3555fd

5

LTC3555EUFD-3-PBF

LTC3555EUFD-3-PBF概述

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