LTC4413EDD-1#TRPBF_技术文档

LTC4413

Dual 2.6A, 2.5V to 5.5V,

Ideal Diodes in 3mm

× 3mm DFN

FEATURES

DESCRIPTION

The LTC^®4413 contains two monolithic ideal diodes,

each capable of supplying up to 2.6A from input voltages

between 2.5V and 5.5V. Each ideal diode uses a 100mΩ

P-channel MOSFET that independently connects INA to

OUTA and INB to OUTB. During normal forward operation

the voltage drop across each of these diodes is regulated

to as low as 28mV. Quiescent current is less than 40μA

for diode currents up to 1A. If either of the output voltages

exceeds its respective input voltages, that MOSFET is

turned off and less than 1μA of reverse current will ﬂow

fromOUTtoIN.MaximumforwardcurrentineachMOSFET

is limited to a constant 2.6A and internal thermal limiting

circuits protect the part during fault conditions.

n

2-Channel Ideal Diode ORing or Load Sharing

Low Loss Replacement for ORing Diodes

Low Forward On-Resistance (100mΩ Max at 3.6V)

Low Reverse Leakage Current (1μA Max)

Small Regulated Forward Voltage (28mV Typ)

2.5V to 5.5V Operating Range

n

2.6A Maximum Forward Current

Internal Current Limit and Thermal Protection

Slow Turn-On/Off to Protect Against Inductive

Source Impedance-Induced Voltage Spiking

Ultralow Quiescent Current Consumption, Low

Power Alternative to the LTC4413-1

Status Output to Indicate if Selected Channel is

Conducting

Programmable Channel On/Off

Low Proﬁle (0.75mm) 10-Lead 3mm × 3mm DFN

Package

n

Two active-high control pins independently turn off the

two ideal diodes contained within the LTC4413, control-

ling the operation mode as described by Table 1. When

the selected channel is reverse biased, or the LTC4413 is

put into low power standby, a status signal indicates this

condition with a low voltage.

n

APPLICATIONS

n

Battery and Wall Adapter Diode ORing in Handheld

A 9μA open-drain STAT pin is used to indicate conduction

status. When terminated to a positive supply through a

470k resistor, the STAT pin can be used to indicate that the

selecteddiodeisconductingwithahighvoltage.Thissignal

can also be used to drive an auxiliary P-channel MOSFET

power switch to control a third alternate power source

when the LTC4413 is not conducting forward current.

Products

n

Backup Battery Diode ORing

n

Power Switching

USB Peripherals

n

Uninterruptable Supplies

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

The LTC4413 is housed in a 10-lead DFN package.

LTC4413 vs 1N5817 Schottky

TYPICAL APPLICATION

2000

V

CC

470k

ENBA

GND LTC4413

ENBB

STAT IS HIGH WHEN

BAT IS SUPPLYING

LOAD CURRENT

1500

STAT

LTC4413

1000

WALL

ADAPTER

(0V TO 5.5V)

INB

OUTB

10μF

BAT

1N5817

CONTROL CIRCUIT

500

INA

OUTA

TO LOAD

4.7μF

0

200

(mV)

300

400

100

4413 TA01

V

FWD

4413 TA01b

4413fc

1

LTC4413

ABSOLUTE MAXIMUM RATINGS

PIN CONFIGURATION

(Note 1)

TOP VIEW

INA, INB, OUTA, OUTB, STAT,

INA

ENBA

GND

ENBB

INB

1

2

3

4

5

10 OUTA

ENBA, ENBB Voltage.................................... –0.3V to 6V

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

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

Junction Temperature (Note 4) ............................. 125°C

Continuous Power Dissipation

9

8

7

6

STAT

NC

11

NC

OUTB

DD PACKAGE

(Derate 25mW/°C Above 70°C).........................1500mW

10-LEAD (3mm s 3mm) PLASTIC DFN

= 125°C, θ = 40°C/W (4-LAYER PCB)

JA

EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB

T

JMAX

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

10-Lead (3mm × 3mm) Plastic DFN

TEMPERATURE RANGE

–40°C to 85°C

LTC4413EDD#PBF

LTC4413EDD#TRPBF

LBGN

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/

ELECTRICAL CHARACTERISTICS ^Thel denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T_A= 25°C. (Notes 2, 6)

SYMBOL PARAMETER

CONDITIONS

and/or V Must Be in This Range

OUT

MIN

TYP

MAX

UNITS

l

V

, V

IN OUT

Operating Supply Range for Channel A or B

V

2.5

5.5

V

IN

for Proper Operation

l

UVLO

UVLO Turn-On Rising Threshold

Max (V , V , V

, V

)

2.4

V

INA INB OUTA OUTB

UVLO Turn-Off Falling Threshold

Max (V , V , V

, V

1.7

–1

INA INB OUTA OUTB

I

Quiescent Current in Forward Regulation (Note 3)

V

OUTB

= 3.6V, I

= –100mA, V = 0V,

25

0.5

22

17

40

2

μA

QF

INA

OUTA

INB

I

= 0mA

l

Quiescent Current While in Reverse

V

= 3.6V, V = 5.5V (Note 6)

OUT

μA

QRIN

IN

Turn-Off, Current Drawn from V

IN

Quiescent Current While in Reverse Turn-Off,

Measured Via GND

V

= V = V

STAT

= 0V, V

= 5.5V,

= 5.5V

30

31

QRGND

QROUTA

INA

INB

OUTB

OUTA

= 0V

l

Quiescent Current While in Reverse Turn-Off,

V

INA

= V = V

INB

Current Drawn from V

Supplies Chip Power

When OUTA

OUTA

I

Quiescent Current While in Reverse Turn-Off,

V

INA

= V = 0V, V

< V

= 5.5V

2

3

μA

QROUTB

QOFF

INB

OUTA

OUTB

Current Drawn from V

Supplies Chip Power

When OUTB

OUTA

I

Quiescent Current with Both ENBA

and ENBB High

V

= V = 3.6V, V and

ENBA

20

31

INA

INB

High, V

= 0V

ENBB

STAT

4413fc

2

LTC4413

ELECTRICAL CHARACTERISTICS ^Thel denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T_A= 25°C. (Notes 2, 6)

SYMBOL PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

I

V

or V Current When V

or V

V

IN

= 0V, V = 5.5V

OUT

–1

1

μA

LEAK

INA

INB

OUTA

OUTB

Supplies Power

V

Reverse Turn-Off Voltage (V

– V )

V

= 3.6V

–5

10

38

mV

RTO

OUT

IN

l

Forward Voltage Drop (V – V

)

OUT

28

100

140

50

FWD

IN

at I

= –1mA

OUT

R

On-Resistance, R

Regulation

V

IN

= 3.6V, I

= –100mA to –500mA

= –1.0A (Note 5)

140

200

mΩ

μs

FWD

ON

FWD

OUT

(Measured as ΔV/ΔI)

(Note 5)

R

On-Resistance, R Regulation

V

= 3.6V, I

ON

IN

(Measured as V/I at I = 1A)

IN

t

PowerPath™ Turn-On Time

V

= 3.6V, from ENB Falling to I Ramp

IN

ON

Starting (Note 7)

PowerPath Turn-Off Time

V

IN

= 3.6V, I = –100mA (Note 7)

OUT

4

μs

OFF

Short-Circuit Response

I

Current Limit

V

= 3.6V (Notes 4, 5)

1.8

A

OC

INX

Quiescent Current While in

Overcurrent Operation

= 3.6V, I

= 1.9A (Notes 4, 5)

OUT

150

300

μA

QOC

INX

STAT Output

l

I

t

STAT Off Current

Shutdown

–1

7

0

9

1

μA

μs

SOFF

SON

STAT Sink Current

V

IN

> V , V

< V

, I

< I

MAX

17

OUT ENB

ENBIL OUT

STAT Pin Turn-On Time

STAT Pin Turn-Off Time

S(ON)

S(OFF)

ENB Inputs

l

V

ENB Inputs Rising Threshold Voltage

ENB Inputs Falling Threshold Voltage

ENB Inputs Hysteresis

V

Rising

540

460

90

600

4.5

mV

μA

ENBIH

ENBIL

ENB

Falling

= (V

400

1.5

ENB

– V )

ENBIL

ENBHYST

ENB

ENBHYST

ENBIH

l

I

ENB Inputs Pull-Down Current

< V = 3.6V, V

> V

ENBIL

3

OUT

IN

ENB

PowerPath is a trademark of Linear Technology Corporation.

Note 4: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions.

Overtemperature protection will become active at a junction temperature

greater than the maximum operating temperature. Continuous operation

above the speciﬁed maximum operating junction temperature may impair

device reliability.

Note 5: This speciﬁcation is guaranteed by correlation to wafer-level

measurements.

Note 6: Unless otherwise speciﬁed, current into a pin is positive and

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 LTC4413 is guaranteed to meet 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.

current out of a pin is negative. All voltages referenced to GND.

Note 3: Quiescent current increases with diode current, refer to plot of I

QF

vs I

.

Note 7: Guaranteed by design.

OUT

4413fc

3

LTC4413

TYPICAL PERFORMANCE CHARACTERISTICS

I_QFvs I_LOAD

I_QFvs Temperature

200

160

120

80

200

160

120

80

60

40

20

0

120°C

80°C

40°C

0°C

120°C

80°C

40°C

0°C

I

QF

AT 1A

–40°C

I

AT 100mA

QF

40

0

100E-6 1E-3

10E-3 100E-3 1E+0 10E+0

(A)

0

1

1.50

I (A)

LOAD

2

2.50

3

40

TEMPERATURE (°C)

0.50

–40

0

80

120

I

LOAD

4413 G01

4413 G02

4413 G03

I_OCvs Temperature (V_IN= 3.5V)

UVLO Thresholds vs Temperature

R_FWDvs V_INat I_LOAD= 500mA

4

3

2

1

2.20

2.15

2.10

120

100

80

60

40

20

0

120°C

UVLO TURN-ON

80°C

40°C

2.05

2.00

1.95

1.90

1.85

0°C

–40°C

UVLO TURN-OFF

0

40

120

–40

0

40

80

120

–40

80

2.5

3.5

4.5

5.5

V

(V)

TEMPERATURE (°C)

IN

4413 G04

4413 G05

4413 G06

R_FWDvs Temperature (V_IN= 3.5V)

V_FWDand R_FWDvs I_LOAD

300

250

200

150

100

50

160

140

120

100

120°C

80°C

40°C

0°C

V

FWD

RFWD I

= 100mA

OUT

–40°C

RFWD I

= 1A

OUT

80

60

RFWD I

= 500mA

R

FWD

OUT

40

20

0

500 1000 1500 2000 2500 3000

(mA)

–20

20

TEMPERATURE (°C)

100

–60

140

60

I

OUT

4413 G08

4413 G07

4413fc

4

LTC4413

TYPICAL PERFORMANCE CHARACTERISTICS

Response to 800mA Load Step

in 80μs

V_FWDand R_FWDvs I_LOAD

V_FWDvs I_LOAD(V_IN= 3.5V)

300

250

200

150

100

50

300

250

200

150

100

50

IN

120°C

80°C

40°C

0°C

120°C

V

200mV/DIV

OUT

FWD

80°C

40°C

0°C

200mV/DIV

–40°C

I

–40°C

OUT

200mA/DIV

R

FWD

4413 G17

20μs/DIV

0

1

10

10000

1

10

100

(mA)

1000

10000

100

(mA)

1000

I

LOAD

4413 G10

4413 G09

ENB Turn-On, 240μs to Recover

with 180mA Load

ENB Turn-Off, 16μs to Disconnect

IN from 180mA Load

ENB Threshold vs Temperature

550

500

450

400

350

300

IN

1V/DIV

IN

V

IH

1V/DIV

OUT

V

OUT

1V/DIV

ENB

1V/DIV

ENB

1V/DIV

V

IL

OUT

1V/DIV

V

ENB

I

OUT

100mA/DIV

OUT

500mA/DIV

4413 G11

4413 G12

100μs/DIV

4μs/DIV

–40

0

40

80

120

TEMPERATURE (°C)

4413 G13

–I_LEAKvs Temperature at

V_REVERSE= 5.5V

ENB Hysteresis vs Temperature

10E-6

1E-6

120

100

80

60

40

20

0

100E-9

10E-9

1E-9

–40

0

40

80

120

–40

0

40

80

120

TEMPERATURE (°C)

4413 G15

4413 G14

4413fc

5

LTC4413

TYPICAL PERFORMANCE CHARACTERISTICS

–I_LEAKvs V_REVERSE

Efﬁciency vs Load Current

Power Loss LTC4413 vs 1N5817

10E-6

1E-6

1.00

0.98

0.96

0.94

0.92

0.90

600

500

80°C

40°C

0°C

–40°C

400

300

100E-9

10E-9

1N5817

LTC4413

200

100

0

1E-9

1.0E-3

10.0E-3 100.0E-3

1.0E+0

10.0E+0

1

500

1000

I

1500

(mA)

2000

2500

0

1

2

3

4

5

LOAD CURRENT (A)

V

(V)

LOAD

REVERSE

1351 G13

4413 G16

4413 G19

PIN FUNCTIONS

INA (Pin 1): Primary Ideal Diode Anode and Positive

Power Supply. Bypass INA with a ceramic capacitor of at

least 1μF. 1Ω snub resistors in series with a capacitor and

higher valued capacitances are recommended when large

inductances are in series with this input. Limit slew rate

on this pin to less than 0.5V/μs. This pin can be grounded

when not used.

higher valued capacitances are recommended when large

inductances are in series with this input. Limit slew rate

on this pin to less than 0.5V/μs. This pin can be grounded

when not used.

OUTB(Pin6):SecondaryIdealDiodeCathodeandOutput.

BypassOUTBwithahigh(1mΩmin)ESRceramiccapacitor

of at least 4.7μF. Limit slew rate on this pin to less than

0.5V/μs. This pin must be left ﬂoating when not in use.

ENBA (Pin 2): Enable Low for Diode A. Weak (3μA) pull-

down. Pull this pin high to shut down this power path.

Tie to GND to enable. Refer to Table 1 for mode control

functionality. This pin can be left ﬂoating, weak pull-down

internal to the LTC4413.

NC (Pin 7): No Internal Connection.

NC (Pin 8): No Internal Connection.

STAT (Pin 9): Status Condition Indicator. Weak (9μA)

pull-down current output. When terminated, STAT = high

indicates diode conducting.

GND(Pins3, 11):PowerandSignalGroundfortheIC. The

exposed pad of the package, Pin 11, must be soldered to

PCB ground to provide both electrical contact to ground

and good thermal contact to the PCB.

The function of the STAT pin depends on the mode that

has been selected. Table 2 describes the STAT pin output

current as a function of the mode selected as well as the

conduction state of the two diodes. This pin can also be

left ﬂoating or grounded.

ENBB (Pin 4): Enable Low for Diode B. Weak (3μA) pull-

down. Pull this pin high to shut down this power path.

Tie to GND to enable. Refer to Table 1 for mode control

functionality. This pin can be left ﬂoating, weak pull-down

internal to the LTC4413.

OUTA (Pin 10): Primary Ideal Diode Cathode and Output.

BypassOUTAwithahigh(1mΩmin)ESRceramiccapacitor

of at least 4.7μF. Limit slew rate on this pin to less than

0.5V/μs. This pin must be left ﬂoating when not in use.

INB (Pin 5): Secondary Ideal Diode Anode and Positive

Power Supply. Bypass INB with a ceramic capacitor of at

least 1μF. 1Ω snub resistors in series with a capacitor and

4413fc

6

LTC4413

BLOCK DIAGRAM

INA

1

OUTA

10

OVER CURRENT

PA

–

+

UVLO

ENA

+

–

AENA

OVER TEMP

ENB

BENA

STAT

OUTA (MAX)

OUTB (MAX)

9

STB

V

GATEA

–

+

V

–

OFF

O.5V

9μA

ENA

AENA

ENBA

A

+

2

+

–

3μA

GND

3

INB

5

OUTB

6

OVER CURRENT

PB

–

+

–

V

GATEB

–

+

V

–

OFF

O.5V

ENB

BENA

ENBB

B

+

4

+

–

3μA

4413 F01

Figure 1

4413fc

7

LTC4413

OPERATION

TheLTC4413isdescribedwiththeaidoftheBlockDiagram

(Figure 1). Operation begins when the power source at

alternate supply, V , exceeds the voltage at V , the

INB INA

LTC4413 selects this input voltage as the internal supply

V

or V rises above the undervoltage lockout (UVLO)

(V ). This second ideal diode operates independently of

INA

INB

DD

voltage of 2.4V and either of the ENBA or ENBB control

pins is low. If only the voltage at the V pin is present, the

the ﬁrst ideal diode function.

INA

When an alternate power source is connected to the load

power source to the LTC4413 (V ) will be supplied from

DD

at V

(or V

), the LTC4413 senses the increased

OUTA

voltage at V

OUTB

the V pin. The ampliﬁer (A) pulls a current proportional

INA

and ampliﬁer A increases the voltage

OUTA

to the difference between V and V

from the gate

INA

OUTA

V

GATEA

, reducing the current through PA. When V

is

OUTA

(V

)oftheinternalPFET(PA),drivingthisgatevoltage

GATEA

higher than V + V , V

is pulled up to V , which

INA

RTO GATEA

DD

below V . This turns on PA. As V

is pulled up to

INA

OUTA

turns off PA. The internal power source for the LTC4413

(V )isthendivertedtosourcecurrentfromtheV pin,

a forward voltage drop (V ) of 20mV below V , the

FWD

INA

DD

only if V

OUTA

). The system

LTC4413 regulates V

to maintain the small forward

GATEA

is larger than V (or V

OUTA

INB

OUTB

voltage drop. The system is now in forward regulation and

the load at V is powered from the supply at V . As

is now in the reverse turn-off mode. Power to the load is

being delivered from an alternate supply and only a small

OUTA

INA

the load current varies, V

is controlled to maintain

GATEA

current is drawn from V to sense the potential at V

.

INA

V

until the load current exceeds the transistor’s (PA)

FWD

When the selected channel of the LTC4413 is in reverse

turn-off mode or both channels are disabled, the STAT pin

ability to deliver the current as V

approaches GND.

GATEA

At this point the PFET behaves as a ﬁxed resistor with

sinks 9μA of current (I ) if connected.

resistance R , whereby the forward voltage increases

SON

ON

slightly with increased load current. As the magnitude of

Channel selection is accomplished using the two ENB

pins, ENBA and ENBB. When the ENBA input is asserted

I

increasesfurther(suchthatI

>I ), theLTC4413

LOAD OC

OUT

ﬁxes the load current to the constant value I to protect

OC

(high), PA’s gate voltage is pulled to V at a controlled

DD

the device. The characteristics for parameters R

,

FWD

rate, limiting the turn-off time to avoid voltage spiking at

theinputwhenbeingdrivenbyaninductivesourceimped-

ance. A 3μA pull-down current on the ENB pins ensures

a low level at these inputs if left ﬂoating.

R

, V

and I are speciﬁed with the aid of Figure 2,

ON FWD OC

illustrating the LTC4413 forward voltage drop versus that

of a Schottky diode.

If another supply is provided at V , the LTC4413 likewise

INB

Slow Response Time

regulates the gate voltage on PB to maintain the output

voltage V

just below the input voltage V . If this

The LTC4413-1 (or LTC4413-2) is recommended for

applications with demanding load step or fast slew rate

requirements.TheLTC4413-1andLTC4413-2providebet-

ter load regulation in these environments at the expense

of higher quiescent current. The LTC4413 is optimized

for lower power consumption and should not be used in

high slew rate environments or when large and fast load

transients are anticipated.

OUTB

INB

I

OC

SLOPE

ON

1/R

I

FWD

LTC4413

SCHOTTKY

DIODE

SLOPE

1/R

FWD

Overcurrent and Short-Circuit Protection

Duringanovercurrentcondition,theoutputvoltage droops

as the load current exceeds the amount of current that

the LTC4413 can supply. At the time when an overcurrent

conditionisﬁrstdetected, theLTC4413takessometimeto

0

FORWARD VOLTAGE (V)

4413 F02

Figure 2

detect this condition before reducing the current to I

.

MAX

4413fc

8

LTC4413

OPERATION

For short durations after the output is shorted, the

current may exceed I

short-circuit current can be large, depending on the load

currentimmediatelybeforetheshortcircuitoccurs.During

overcurrent operation, the power consumption of the

LTC4413islarge,andislikelytocauseanovertemperature

condition as the internal die temperature exceeds the

thermal shutdown temperature.

Table 1. Mode Control

ENB1

ENB2 STATE

. The magnitude of this peak

MAX

Low

Diode OR (NB: The Two Outputs Are Not Connected

Internal to the Device)

Low

High

Low

High

Diode A = Enabled, Diode B = Disabled

Diode A = Disabled, Diode B = Enabled

All 0ff (Low Power Standby)

The function of the STAT pin depends on the mode that

has been selected. The following table describes the STAT

pin output current as a function of the mode selected, as

well as the conduction state of the two diodes.

Overtemperature Protection

The overtemperature condition is detected when the

internal die temperature increases beyond 150°C. An

overtemperature condition causes the gate ampliﬁers (A

and B) as well as the two P-channel MOSFETs (PA and

PB) to be shut off. When the internal die temperature

cools to below 140°C, the ampliﬁers turn on and revert

to normal operation. Note that prolonged operation under

overtemperature conditions degrades reliability.

Table 2. STAT Output Pin Funtion

ENB1

ENB2

CONDITIONS

STAT

Low

Diode A Forward Bias,

Diode B Forward Bias

I

= 0μA

= 9μA

= 0μA

= 9μA

= 0μA

= 9μA

SNK

Diode A Forward Bias,

Diode B Reverse Bias

I

SNK

Diode A Reverse Bias,

Diode B Forward Bias

Channel Selection and Status Output

Diode A Reverse Bias,

Diode B Reverse Bias

Two active-high control pins independently turn off the

two ideal diodes contained within the LTC4413, control-

ling the operation mode as described by Table 1. When

the selected channel is reverse biased, or the LTC4413 is

put into low power standby, the status signal indicates

this condition with a low voltage.

Low

High

Low

High

Diode A Forward Bias,

Diode B Disabled

Diode A Reverse Bias,

Diode B Disabled

Diode A Disabled,

Diode B Forward Bias

Diode A Disabled

Diode B Reverse Bias

Diode A Disabled,

Diode B Disabled

APPLICATIONS INFORMATION

Introduction

rate or load transient applications, the pin compatible

LTC4413-1 is recommended.

The LTC4413 is intended for power control applications

that include low loss diode ORing, fully automatic

switchoverfromaprimarytoanauxiliarysourceofpower,

microcontroller controlled switchover from a primary to

an auxiliary source of power, load sharing between two or

morebatteries,chargingofmultiplebatteriesfromasingle

charger and high side power switching. The LTC4413 is

optimized for low quiescent power consumption at the

expense of transient response. For more demanding slew

Dual Battery Load Sharing with Automatic Switchover

to a Wall Adapter

An application circuit for dual battery load sharing with

automaticswitchoverofloadfrombatteriestoawalladapter

is shown in Figure 3. When the wall adapter is not present,

whichever battery that has the higher voltage provides the

load current until it has discharged to the voltage of the

other battery. The load is then shared between the two

4413fc

9

LTC4413

APPLICATIONS INFORMATION

MP1 FDR8508

microcontroller’s analog inputs (perhaps with the aid of a

resistor voltage divider) monitors each supply input and

the LTC4413 status, and then commands the LTC4413

through the two ENBA/ENBB control inputs.

WALL

ADAPTER

C1

10μF

R1

1000k

2

4

ENBA

ENBB

GND

9

R2

200k

STAT

Automatic Switchover from a Battery to an Auxiliary

Supply or a Wall Adapter

3,11

R

STAT

LTC4413

470k

IDEAL

1

5

INA

INB

OUTA 10

TO

LOAD

Figure 5 illustrates an application for implementing the

function of automatic switchover from a battery to either

an auxiliary supply or to a wall adapter using the LTC4413.

The LTC4413 automatically senses the presence of a wall

adapter as the ENBB pin voltage is pulled higher than its

risingturn-offthresholdof550mVthroughresistivedivider

(R2 and R3). This disables the AUX input from powering

the load. If the AUX is not present when a wall adapter is

attached (i.e., the BAT is supplying load current), as the

wall adapter voltage rises, the body diode in MP1 forward

biases, pulling the output voltage above the BAT voltage.

The LTC4413 senses a reverse voltage of as little as 10mV

and turns off the ideal diode between INA and OUTA. This

causes the STAT voltage to fall, turning on MP1. The load

thendrawscurrentfromthewalladapter,andthebatteryis

disconnectedfromtheload.IftheAUXisnotpresentwhen

the wall adapter is removed, the load voltage droops until

the BAT voltage exceeds the load voltage. The LTC4413

senses that the BAT voltage is greater, causing the STAT

voltage to rise, disabling MP1; the BAT then provides

power to the load.

BATA

1-CELL Li-Ion

IDEAL

OUTB

6

BATB

1-CELL Li-Ion

C2

4.7μF

C1:C1206C106K8PAC

C2:C1206C475K8PAC

4413 F03

Figure 3

batteries according to the capacity of each battery. The

higher capacity battery provides proportionally higher

current to the load. When a wall adapter input is applied,

the voltage divider formed by R1 and R2 disables the

LTC4413, causing the STAT pin voltage to fall, turning on

MP1. At this point the load is powered by the wall adapter

and both batteries may be removed without interrupting

the load voltage. When the wall adapter is removed, the

outputvoltagedroopsuntilthevoltagedividerturnsonthe

LTC4413, at which point the batteries revert to providing

load power. The status signal can also be used to provide

information as to whether the wall adapter (or BATB) is

supplying the load current.

Automatic PowerPath Control

Figure 4 illustrates an application circuit for microcon-

troller monitoring and control of two power sources. The

MP1 FDR8508

WALL

ADAPTER

C1

R

R2

STAT

10μF

470k

1000k

9

4

1

R1

1Ω

ENBB

LTC4413

IDEAL

INA

STAT

MICROCONTROLLER

R3

100k

R

STAT

470k

2

ENBA

9

OUTA 10

4

ENBB

GND

STAT

3,11

BAT

3,11

5

GND

LTC4413

IDEAL

OUTB

IDEAL

INB

6

AUX

ADAPTER

TO

LOAD

1

5

INA

INB

OUTA 10

PRIMARY

POWER

TO

LOAD

R4

1000k

C2

4.7μF

C

A

IDEAL

10μF

2

ENBA

4413 F05

OUTB

6

AUX

R5

500k

POWER

C

C1

4.7μF

B

C1:C0805C106K8PAC

C2:C1206C475K8PAC

10μF

4413 F04

Figure 4

Figure 5

4413fc

10

LTC4413

APPLICATIONS INFORMATION

untilbothbatteryvoltagesareequal,thenbotharecharged.

While both batteries are charging simultaneously, the

higher capacity battery gets proportionally higher current

fromthecharger.ForLi-Ionbatteries,bothbatteriesachieve

the ﬂoat voltage minus the forward regulation voltage of

20mV. This concept can apply to more than two batteries.

The STAT pin provides information as to when battery 1

is being charged. For intelligent control, the ENBA/ENBB

pin inputs can be used with a microcontroller as shown

in Figure 4.

If the AUX is present when a wall adapter is applied, as

the resistive divider to ENBB rises through the turn-off

threshold, the STAT pin voltage falls and MP1 conducts,

allowing the wall adapter to power the load. When the wall

adapter is removed while the AUX supply is present, the

load voltage falls until the voltage divider at the ENBB pin

falls through its turn-on threshold. Once this occurs, the

LTC4413automaticallyconnectstheAUXsupplytotheload

when the AUX voltage exceeds the output voltage, causing

the STAT voltage to rise and disabling the external PFET.

When an AUX supply is attached, the voltage divider at

ENBA (R4 and R5) disconnects the battery from the load,

and the auxiliary supply provides load current, unless a

wall adapter is present as described earlier. If the auxiliary

supply is removed, the battery may again power the load,

depending on if a wall adapter is present.

Automatic Switchover from a Battery to a Wall

Adapter and Charger

Figure 7 illustrates the LTC4413 performing the function

of automatically switching a load over from a battery to a

walladapterwhilecontrollinganLTC4059batterycharger.

When no wall adapter is present, the LTC4413 connects

the load at OUTA from the Li-Ion battery at INA. In this

condition, the STAT voltage is high, thereby disabling the

battery charger. If a wall adapter of a higher voltage than

the battery is connected to INB, the load voltage rises as

the second ideal diode conducts. As soon as the OUTA

voltage exceeds INA voltage, the BAT is disconnected

from the load and the STAT voltage falls, turning on the

LTC4059 battery charger and beginning a charge cycle. If

the wall adapter is removed, the voltage at INB collapses

until it is below the load voltage. When this occurs, the

LTC4413 automatically reconnects the battery to the load

and the STAT voltage rises, disabling the LTC4059 battery

charger. One major beneﬁt of this circuit is that when a

wall adapter is present, the user may remove the battery

and replace it without disrupting the load.

Multiple Battery Charging

Figure6illustratesanapplicationcircuitforautomaticdual

battery charging from a single charger. Whichever battery

hasthelowervoltagewillreceivethelargerchargingcurrent

STAT IS HIGH

WHEN BAT1

470k

LTC4413

STAT

9

IS CHARGING

IDEAL

BATTERY

CHARGER

INPUT

1

5

INA

OUTA 10

LOAD1

LOAD2

BAT1

BAT2

IDEAL

INB

OUTB

6

2

4

ENBA

ENBB

GND

3,11

4413 F06

Figure 6

LTC4413

9

STAT

R1

560k

LTC4059

IDEAL

INA

1

OUTA 10

V

BAT

CC

2

4

ENB

PROG

ENBA

ENBB

GND

1-CELL

Li-Ion

R2

100k

3,11

Li CC GND

IDEAL

INB OUTB

5

6

WALL

ADAPTER

TO LOAD

C1: C0805C106K8PAC

C2: C1206C475K8PAC

C1

10μF

C2

4.7μF

4413 F07

Figure 7

4413fc

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

11

LTC4413

PACKAGE DESCRIPTION

DD Package

10-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1699 Rev B)

R = 0.125

TYP

6

0.40 p 0.10

10

0.70 p0.05

3.55 p0.05

2.15 p0.05 (2 SIDES)

1.65 p0.05

3.00 p0.10

(4 SIDES)

1.65 p 0.10

(2 SIDES)

PIN 1

PACKAGE

OUTLINE

TOP MARK

(SEE NOTE 6)

(DD) DFN REV B 0309

5

1

0.25 p 0.05

0.50 BSC

0.75 p0.05

0.200 REF

0.25 p 0.05

0.50

BSC

2.38 p0.10

(2 SIDES)

2.38 p0.05

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).

CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE

TOP AND BOTTOM OF PACKAGE

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LTC1558/LTC1559

Backup Battery Controller with Programmable Adjustable Backup Voltage from 1.2V NiCd Button Cell, Includes Boost Converter

Output

LTC1998

LTC4054

2.5μA, 1% Accurate Programmable Battery

Detector

Adjustable Trip Voltage/Hysteresis, ThinSOT™

800mA Standalone Linear Li-Ion Battery

Charger with Thermal Regulation in ThinSOT Current Monitor for Gas Gauging, C/10 Charge Termination

No External MOSFET, Sense Resistor or Blocking Diode Required, Charge

LTC4055

LTC4085

USB Power Controller and Li-Ion Charger

Automatic Switchover, Charges 1-Cell Li-Ion Batteries

USB Power Manager with Ideal Diode

Controller and Li-Ion Charger

Charges Single Cell Li-Ion Batteries Directly from a USB Port, Thermal

Regulation, 200mΩ Ideal Diode with <50mΩ Option, 4mm × 3mm 14-Lead

DFN Package

LTC4350

Hot Swappable Load Share Controller

MOSFET Diode-OR Controller

Allows N + 1 Redundant Supply, Equally Loads Multiple Power Supplies

Connected in Parallel

LTC4351

LTC4411

1.2V to 18V Input, Internal Boost Regulator for Driving N-Channel MOSFET

No External MOSFET, Automatic Switching Between DC Sources, Simpliﬁed

2.6A Low Loss Ideal Diode in ThinSOT

Load Sharing

LTC4412/LTC4412HV PowerPath Controllers in ThinSOT

More Efﬁcient than Diode ORing, Automatic Switching Between DC Sources,

Simpliﬁed Load Sharing, 3V ≤ V ≤ 28V (3V ≤ V ≤ 36V for HV)

IN

LTC4413-1/LTC4413-2 Dual 2.6A, 2.5V to 5.5V Fast Ideal Diodes in

Fast Pin Compatible Replacement for the LTC4413 (LTC4413-2 with

Overvoltage Protection)

3mm × 3mm DFN

ThinSOT is a trademark of Linear Technology Corporation.

4413fc

LT 0909 REV C • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

12

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com


型号：	LTC4413EDD-1#TRPBF
厂家：	Linear
描述：	LTC4413-1 and -2 - Dual 2.6A, 2.5V to 5.5V Fast Ideal Diodes in a 3mm x 3mm DFN; Package: DFN; Pins: 10; Temperature Range: -40°C to 85°C 光电二极管
文件：	总12页 (文件大小：148K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC4413EDD-1#TRPBF [Linear]

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