LTC4413EDD-1#PBF_技术文档

LTC4413-1/LTC4413-2

Dual 2.6A, 2.5V to 5.5V

Fast Ideal Diodes

in 3mm × 3mm DFN

FeaTures

DescripTion

n

2-Channel Ideal Diode OR’ing or Load Sharing

The LTC^®4413-1 and LTC4413-2 each contain two mono-

lithic ideal diodes, each capable of supplying up to 2.6A

from input voltages between 2.5V and 5.5V. The ideal

diodesusea100mΩP-channelMOSFETtoindependently

connect INA to OUTA and INB to OUTB. During normal

forward operation, the voltage drops across each of

these diodes are regulated to as low as 18mV. Quiescent

current is less than 80µA for diode currents up to 1A. If

either of the output voltages exceeds its respective input

voltage, that MOSFET is turned off and less than 1µA of

reverse current flows from OUT to IN. Maximum forward

current in each MOSFET is limited to a constant 2.6A and

internal thermal limiting circuits protect the part during

faultconditions.Aninternalovervoltageprotectionsensor

detects when a voltage exceeds the LTC4413-2 absolute

maximum voltage tolerance.

n

Low Loss Replacement for PowerPath™ OR’ing

Diodes

n

Fast Response Replacement for LTC4413

n

Low Forward On-Resistance (140mΩ Max at 3.6V)

n

Low Reverse Leakage Current

n

Low Regulated Forward Voltage (18mV Typ)

n

Overvoltage Protection Sensor with Drive Output for

an External P-Channel MOSFET (LTC4413-2 Only)

n

2.5V to 5.5V Operating Range

n

2.6A Maximum Forward Current

n

Internal Current Limit Protection

n

Internal Thermal Protection

n

Status Output to Indicate if Selected Channel is

Conducting

Programmable Channel On/Off

Low Proﬁle (0.75mm) 10-Lead 3mm

Package

n

× 3mm DFN

Twoactive-highcontrolpinsindependentlyturnoffthetwo

ideal diodes contained within the LTC4413-1/LTC4413-2.

When the selected channel is reverse biased, or the

LTC4413-1/LTC4413-2 is put into low power standby, the

status signal is pulled low by an 11µA open drain.

applicaTions

n

Battery and Wall Adapter Diode OR’ing in Handheld

Products

Backup Battery Diode OR’ing

Power Switching

USB Peripherals

Uninterruptable Supplies

TheLTC4413-1/LTC4413-2arehousedina10-lead3mm

n

× 3mm DFN package.

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

ThinSOT and PowerPath are trademarks of Analog Devices, Inc. All other trademarks are the

property of their respective owners.

Typical applicaTion

Automatic Switchover from a Battery to a Wall Adapter

FDR8508

Power Loss vs Load

700

V

CC

600

WALL

ADAPTER

INPUT

INA

OUTA

500

470k

STAT

10µF

IDEAL

LTC4413-1

0.1µF

1Ω

ENBA

STAT

400

LTC4413-2

GND

OVI

300

ENBB

INB

OVP

OUTB

OVP

1N5817

BAT

200

TO LOAD

+

4.7µF

IDEAL

100

0

441312 TA01a

0

500

1000 1500 2000 2500 3000

STAT IS HIGH WHEN WALL ADAPTER IS

SUPPLYING LOAD CURRENT

LOAD (mA)

OVP IS HIGH WHEN WALL ADAPTER VOLTAGE > 6V

441312 TA01b

441312fg

1

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

absoluTe MaxiMuM raTings ^{(Note 1)}

INA, INB, OUTA, OUTB, STAT,

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

Continuous Power Dissipation ..........................1500mW

(Derate 25mW/°C Above 70°C)

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

OVI, OVP Voltage ........................................–0.3V to 13V

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

pin conFiguraTion

LTC4413-1

LTC4413-2

TOP VIEW

INA

ENBA

GND

ENBB

INB

1

2

3

4

5

10 OUTA

INA

ENBA

GND

ENBB

INB

1

2

3

4

5

10 OUTA

9

8

7

6

STAT

NC

9

8

7

6

STAT

OVI

11

NC

OVP

OUTB

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

T

= 125°C, θ = 43°C/W

T

= 125°C, θ = 43°C/W

JMAX JA

JMAX

JA

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

http://www.linear.com/product/LTC4413-1#orderinfo

orDer inForMaTion

LEAD FREE FINISH

LTC4413EDD-1#PBF

LTC4413EDD-2#PBF

LEAD BASED FINISH

LTC4413EDD-1

TAPE AND REEL

PART MARKING

LCPP

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC4413EDD-1#TRPBF

LTC4413EDD-2#TRPBF

TAPE AND REEL

–40°C to 85°C

10-Lead (3mm × 3mm) Plastic DFN

PACKAGE DESCRIPTION

LCPQ

–40°C to 85°C

PART MARKING

LCPP

TEMPERATURE RANGE

–40°C to 85°C

LTC4413EDD-1#TR

LTC4413EDD-2#TR

10-Lead (3mm × 3mm) Plastic DFN

LTC4413EDD-2

LCPQ

–40°C to 85°C

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

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/. Some packages are available in 500 unit reels through

designated sales channels with #TRMPBF suffix.

441312fg

2

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

elecTrical characTerisTics

The l 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 for Proper

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

Operation

l

UVLO

UVLO Turn-On Rising Threshold

UVLO Turn-Off Falling Threshold

Max (V , V , V

, V

)

2.45

V

INA INB OUTA OUTB

Max (V , V , V

, V

1.7

–1

INA INB OUTA OUTB

I

Quiescent Current in Forward Regulation,

Measured via GND

V

= 3.6V, I = 100mA, V = 0V,

40

2.5

28

58

4.5

36

µA

QF

INA

INB

INA

INB

I

= 0mA (Note 3)

l

Current Drawn from or Sourced into IN

V

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

OUT

µA

QRIN

IN

When V

is Greater than V

IN

OUT

Quiescent Current While in Reverse

Turn-Off, Measured via GND

V

= V = 0V, V

STAT

= V

= 5.5V,

OUTA

QRGND

QROUTB

INA

INB

OUTB

OUTA

= 0V

l

Quiescent Current While in Reverse

V

INA

= V = 0V, V

= 3.6V, V = 5.5V

OUTB

3.5

6.5

INB

Turn-Off. Current Drawn from V

OUTA

When OUTB Supplies Chip Power

I

Quiescent Current with Both ENBA and

ENBB High

V

= V = 3.6V, V

= V = 1V

ENBB

28

38

µA

QOFF

INA

INB

ENBA

l

V

Reverse Turn-Off Voltage (V

– V )

V

= 3.6V

–5

10

24

mV

RTO

OUT

IN

Forward Voltage Drop (V – V

)

OUT

18

100

140

11

FWD

IN

at I

= –1mA

OUT

R

On-Resistance, R

Regulation

V

IN

V

IN

V

IN

= 3.6V, I = –100mA to –500mA (Note 5)

OUT

140

200

mΩ

µs

FWD

(Measured as ΔV/ΔI)

On-Resistance, R Regulation

= 3.6V, I = 1A (Note 5)

ON

IN

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

IN

t

PowerPath Turn-On Time

= 3.6V, from ENBA, ENBB Falling to I

Ramp

=

ON

OUT

Starting

PowerPath Turn-Off Time

V

= 3.6V, from ENBA, ENBB Rising with I

IN

2

µs

OFF

IN

100mA Falling to 0mA

Short-Circuit Response

I

Current Limit

V

= 3.6V (Note 5)

1.8

A

OC

INA OR B

Quiescent Current While in Overcurrent

Operation

= 3.6V, I

= 1.8A (Note 5)

OUT

100

130

µA

QOC

STAT Output

l

I

t

STAT Off Current

Shut Down

–1

7

0

1

µA

µs

SOFF

SON

STAT Sink Current

V

> V , V

> V

, T < 135°C, I

< I

MAX

11

1.8

0.8

15

IN

OUT ENB

ENBIH

J

OUT

STAT Pin Current Turn-On Time

STAT Pin Current Turn-Off Time

= 3.6V, from ENBA, ENBB Falling

= 3.6V, from ENBA, ENBB Rising

S(ON)

S(OFF)

ENB Inputs

l

V

ENB Inputs Rising Threshold Voltage

ENB Inputs Falling Threshold Voltage

ENB Input Hysteresis

V

, V

ENBA ENBB

Rising

Falling

540

460

90

600

4

mV

µA

ENBIH

ENBIL

, V

400

2

ENBA ENBB

= (V

– V

)

ENBIL

ENBHYST

ENB

ENBHYST

ENBIH

l

I

ENB Inputs Pull-Down Current

< V = 3.6V, V

< V

, V

< V

ENBIL

3

OUT

IN

ENBA

ENBIL ENBB

441312fg

3

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

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

OVI Input (LTC4413-2 Only)

V

OVI Input Rising Threshold Voltage

OVI Input Falling Threshold Voltage

OVI-OVP Voltage Drop

V

Rising

5.9

5.6

100

80

6.2

V

OVIH

OVIL

OVID

OVI

Falling

5.4

= 8V, No Load at OVP

= 8V

mV

µA

I

OVI Bias Current

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 LTC4413-1/LTC4413-2 are 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.

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: Specification is guaranteed by correlation to wafer-level

measurements.

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

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

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

I

vs I

.

QF

OUT

441312fg

4

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

Typical perForMance characTerisTics

I_QFvs I_LOAD(Log)

I_QFvs I_LOAD(Linear)

I_QFvs Temperature

120

100

80

60

40

20

0

120

120°C

80°C

40°C

0°C

80°C

40°C

0°C

100

80

1A

80

60

500mA

100mA

–40°C

60

40

1mA

40

20

0

20

0

1

10

100

LOAD (mA)

1000

10000

0

500 1000 1500 2000 2500 3000

LOAD (mA)

–40

0

40

TEMPERATURE (°C)

80

120

441312 G01

441312 G02

441312 G03

I_QFvs V_IN

I_OCvs Temperature

UVLO Thresholds vs Temperature

3500

3000

2500

2.20

2.15

2.10

90

80

70

60

50

40

30

20

10

0

I

= 1A

QF

RISING

2000

1500

1000

500

0

2.05

2.00

1.95

1.90

1.85

I

= 100mA

QF

FALLING

4

4.5

2

2.5

3

3.5

5

5.5

6

0

40

120

0

40

120

–40

80

–40

80

V

(V)

TEMPERATURE (°C)

IN

441312 G04

441312 G05

441312 G06

ENBA, ENBB Thresholds vs

Temperature

ENBA, ENBB Hysteresis vs

Temperature

UVLO Hysteresis vs Temperature

600

500

250

120

100

80

60

40

20

0

200

150

ENBIH

ENBIL

400

300

100

50

0

200

100

0

–40

0

40

80

120

60 80

TEMPERATURE (°C)

–40 –20

0

20 40

100 120

441312 G09

40

TEMPERATURE (°C)

–40 –20

0

20

60 80 100 120

TEMPERATURE (°C)

441312 G08

441312 G07

441312fg

5

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

Typical perForMance characTerisTics

R_FWDvs V_INand I_LOAD= 500mA

V_FWDand R_FWDvs I_LOAD(Linear)

R

_FWDand V_FWDvs I_LOAD(Log)

80

78

76

74

72

70

68

66

64

62

60

500

400

300

200

250

200

150

100

600

500

300

250

120°C

80°C

40°C

0°C

120°C

80°C

40°C

0°C

–40°C

V

400

300

200

150

FWD

R

FWD

V

FWD

200

100

0

100

50

0

R

FWD

100

0

50

0

1000 1500 2000 2500 3000

LOAD (mA)

1

10

100

1000

10000

500

2

4

5

5.5

2.5

3

3.5

4.5

6

LOAD (mA)

V

(V)

IN

441312 G11

441312 G12

441312 G10

I_LEAKvs Temperature at

V_REVERSE= 5.5V

R_FWDvs Temperature

V_FWDvs I_LOAD(Log)

1

250

200

150

100

50

120

100

120°C

80°C

40°C

0°C

0.1

0.01

100mA

–40°C

80

60

5.5V

500mA

1A

3.6V

0.001

40

20

0

0.0001

0

0.00001

1

10

100

LOAD (mA)

1000

10000

–40

0

40

TEMPERATURE (°C)

80

120

–40 –20

0

20 40 60 80 100 120

TEMPERATURE (°C)

441312 G15

441312 G13

441312 G14

Response to 800mA Load Step

in <16µs

ENBA, ENBB Turn-On, 30µs to

Turn On with 180mA Load

I

_LEAKvs V_REVERSE

100

10

120°C

80°C

40°C

0°C

CH1 = IN 100mV/DIV

CH1 INA, INB 1V/DIV

CH2 OUTA, OUTB

CH2 OUT

100mV/DIV

1V/DIV

CH3 ENBA, ENBB

1V/DIV

1

–40°C

0.1

CH4 I

OUT

0.01

200mV/DIV

CH4 I

, I

OUTA OUTB

200mV/DIV

0.001

0.0001

0.00001

441312 G17

441312 G18

4µs/DIV

10µs/DIV

0

1

2

3

4

5

6

V

(V)

REVERSE

441312 G16

441312fg

6

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

Typical perForMance characTerisTics

ENBA, ENBB Turn-Off, 2µs to

Disconnect IN from 180mA Load

Efficiency vs Load Current

Power Loss vs Load Current

100

99

98

97

96

95

94

93

92

91

90

1000

120°C

80°C

40°C

0°C

–40°C

CH1 INA, INB 1V/DIV

CH2 OUTA, OUTB

1V/DIV

100

CH3 ENBA, ENBB

1V/DIV

10

1

CH4 I , I

INA INB

100mV/DIV

120°C

80°C

40°C

0°C

441312 G19

4µs/DIV

–40°C

0

1

10

100

1000

10000

1

10

100

1000

10000

LOAD (mA)

441312 G20

441312 G21

Overvoltage Hysteresis

vs Temperature (LTC4413-2 Only)

OVI Current vs Voltage

(LTC4413-2 Only)

Overvoltage Thresholds

vs Temperature (LTC4413-2 Only)

140

120

6.4

6.2

6.0

400

350

300

250

200

150

100

50

T

= 25°C

A

OVP RISING

100

80

60

40

20

5.8

5.6

5.4

5.2

5.0

OVP FALLING

0

8

12

0

2

4

6

10

40

0

40

120

–40

0

80

120

–40

80

V

(V)

TEMPERATURE (°C)

OVI

441312 G24

441312 G23

441312 G22

OVI-OVP Voltage Drop

vs OVI Voltage (LTC4413-2 Only)

I_QOVI vs Temperature

(LTC4413-2 Only)

OVI-OVP vs Temperature

(LTC4413-2 Only)

180

160

140

120

100

80

6

5

4

3

2

1

0

160

140

120

100

80

T

= 25°C

A

I

Q

OVI = 13V

V

= 13V

OHOVP

V

= 6.5V

OHOVP

I

Q

OVI = 6.5V

60

40

20

0

40

TEMPERATURE (°C)

–40

0

80

120

40 60

20

TEMPERATURE (°C)

8

12

–40 –20

0

80 100 120

441312 G27

0

2

4

6

10

OVI (V)

441312 G26

441312 G25

441312fg

7

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

pin FuncTions

INA(Pin1):PrimaryIdealDiodeAnodeandPositivePower

Supply for LTC4413-1/LTC4413-2. Bypass INA with a ce-

ramic capacitor of at least 1µF. (Series 1Ω snub resistors

and higher valued capacitances are recommended when

large inductances are in series with this input.) This pin

can be grounded when not used. Limit slew rate on this

pin to less than 2.5V/µs.

OVP (Pin 7, LTC4413-2 Only): Drive Output for an Exter-

nal OVP Switch PMOS Transistor (To Inhibit Overvoltage

Wall Adapter Voltages from Damaging Device.) During

overvoltage conditions, this output will remain high so

long as an overvoltage condition persists. This pin must

be left floating when not in use.

OVI(Pin8,LTC4413-2Only):SenseInputforOvervoltage

Protection Block. This pin can be left floating or grounded

when not used.

ENBA (Pin 2): Enable Low for Diode A. 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, a weak (3.5µA) pull-down internal to LTC4413-1/

LTC4413-2 is included.

STAT (Pin 9): Status Condition Indicator. Weak (11µA)

pull-downcurrentoutput.Whenterminated,highindicates

diode conducting. Refer to Table 2 for the operation of this

pin. This pin can also be left floating or grounded.

GND (Pin 3): Power Ground for the IC.

ENBB (Pin 4): Enable Low for Diode B. 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, a weak (3.5µA) pull-down internal to LTC4413-1/

LTC4413-2 is included.

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

of the LTC4413-1/LTC4413-2. Bypass OUTA with a high

(1mΩ min) ESR ceramic capacitor of at least 4.7µF. This

pin must be left floating when not in use. Limit slew rate

on this pin to less than 2.5V/µs.

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

Power Supply for LTC4413-1/LTC4413-2. Bypass INB

with a ceramic capacitor of at least 1µF. (Series 1Ω snub

resistorsandhighervaluedcapacitancesarerecommended

when large inductances are in series with this input.) This

pin can be grounded when not used. Limit slew rate on

this pin to less than 2.5V/µs.

SGND (Exposed Pad Pin 11): Signal Ground. This pin

must be soldered to PCB ground to provide both electri-

cal contact to ground and good thermal contact to PCB.

OUTB (Pin 6): Secondary Ideal Diode Cathode and Output

of the LTC4413-1/LTC4413-2. Bypass OUTB with a high

(1mΩ min) ESR ceramic capacitor of at least 4.7µF. This

pin must be left floating when not in use. Limit slew rate

on this pin to less than 2.5V/µs.

441312fg

8

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

block DiagraM

OUTA

10

INA

1

–

+

OVER CURRENT

+

–

PA

AENA

OVER TEMP

UVLO

ENA

ENB

OUTA (MAX)

OUTB (MAX)

BENA

–

+

OVER TEMP

V

GATEA

V

OFF

STAT

–

+

9

0.5V

STB

AENA

ENA

ENBA

A

2

+

–

3µA

11µA

GND

INB

3

5

OUTB

6

–

+

OVER CURRENT

+

–

PB

LTC4413-2 ONLY

OVERVOLTAGE PROTECTION

OVI

–

+

8

7

V

GATEB

V

OFF

–

+

–

0.5V

OVP

BENA

ENB

ENBB

B

4

6V

+

–

3µA

441312 BD

441312fg

9

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

operaTion

maintain the output voltage, V

, just below the input

TheLTC4413-1/LTC4413-2aredescribedwiththeaidofthe

OUTB

voltage V . If this alternate supply, V , exceeds the

BlockDiagram.Operationbeginswhenthepowersourceat

INB

voltage at V , the LTC4413-1/LTC4413-2 selects this

V

or V rises above the undervoltage lockout (UVLO)

INB

INA

input voltage as the internal supply (V ). This second

voltageof2.4VandthecorrespondingcontrolpinENBAor

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

DD

ideal diode operates independently of the first ideal diode

INA

function.

the internal power source (V ) is supplied from the V

DD

INA

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

difference between V and V from the gate (V

When an alternate power source is connected to the load

)

GATEA

INA

OUTA

at V

(or V

), the LTC4413-1/LTC4413-2 sense the

OUTA

OUTB

of the internal PFET (PA), driving this gate voltage below

. This turns on PA. As V pulls up to a forward

increased voltage at V

voltage V

, and amplifier A increases the

OUTA

V

INA

OUTA

, reducing the current through PA. When

GATEA

voltage drop (V ) of 15mV below V , the LTC4413

FWD

INA

V

is higher than V + V , V

will be pulled up

OUTA

INA

RTO GATEA

regulates V

to maintain the small forward voltage

GATEA

to V , turning off PA. The internal power source for the

DD

drop. The system is now in forward regulation and the

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

LTC4413-1/LTC4413-2 (V ) then diverts to draw current

DD

OUTA

INA

from the V

pin, only if V

is larger than V (or

OUTA INB

OUTA

load current varies, V

is controlled to maintain V

GATEA

FWD

V

). The system is now in the reverse turn-off mode.

OUTB

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

Power to the load is being delivered from an alternate

supply, and only a small current (I ) is drawn from or

to deliver the current as V

approaches GND. At this

GATEA

LEAK

point, the PFET behaves as a fixed resistor, R , whereby

ON

sourced to V to sense the potential at V

.

INA

the forward voltage increases slightly with increased load

When the selected channel of the LTC4413-1/LTC4413-2

is in reverse turn-off mode or both channels are disabled,

current. As the magnitude of I

increases further, (such

OUT

that I

> I ) the LTC4413-1/LTC4413-2 fixes the load

LOAD OC

the STAT pin sinks 11µA of current (I ) if connected.

current to the constant value I to protect the device.

SON

OC

The characteristics for parameters R , R , V

and

FWD ON FWD

Channel selection is accomplished using the two pins,

ENBA and ENBB. For example with channel A, when the

ENBA input is asserted (high), PA has its gate voltage

I

OC

are specified with the aid of Figure 1, illustrating the

LTC4413-1/LTC4413-2 forward voltage drop versus that

of a Schottky.

pulled to V , turning off PA. A 3.5µA pull-down current

DD

on the ENBA, ENBB pins ensures a low level at these

If another supply is provided at V , the LTC4413-1/

INB

inputs if left floating.

LTC4413-2 likewise regulate the gate voltage on PB to

I

OC

LTC4413-1

LTC4413-2

SLOPE: 1/R

ON

I

FWD

1N5817

SLOPE: 1/R

FWD

0

V

FWD

FORWARD VOLTAGE (V)

441312 F01

Figure 1. The LTC4413 vs the 1N5817

441312fg

10

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

operaTion

Overcurrent and Short-Circuit Protection

Protection for more information on using the overvoltage

protection function within the LTC4413-2.

Duringanovercurrentcondition,theoutputvoltagedroops

as the load current exceeds the amount of current that the

LTC4413-1/LTC4413-2 can supply. At the time when an

overcurrent condition is first detected, the LTC4413-1/

LTC4413-2 take some time to detect this condition before

Channel Selection and Status Output

Twoactive-highcontrolpinsindependentlyturnoffthetwo

ideal diodes contained within the LTC4413-1/LTC4413-2,

controlling the operation mode as described by Table 1.

When the selected channel is reverse biased, or the

LTC4413-1/LTC4413-2 is put into low power standby, the

status signal indicates this condition with a low voltage.

reducing the current to I . For short durations after the

OC

output is shorted, until TOC, the current may exceed I .

OC

The magnitude of this peak short-circuit current can be

large depending on the load current immediately before

theshort-circuitoccurs.Duringovercurrentoperation,the

powerconsumptionoftheLTC4413-1/LTC4413-2islarge,

and is likely to cause an overtemperature condition as the

internal die temperature exceeds the thermal shutdown

temperature.

Table 1. Mode Control

ENBA

ENBB STATE

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 Off (Low Power Standby)

Overtemperature Protection

The overtemperature condition is detected when the

internal die temperature increases beyond 150°C. An

overtemperature condition will cause the gate amplifiers

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

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

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

LTC4413-1/LTC4413-2 reverts to normal operation. Note

thatprolongedoperationunderovertemperatureconditions

degrades reliability.

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.

Table 2. STAT Output Pin Function

ENBA

ENBB CONDITIONS

STAT

Low

Diode A Forward Bias,

Diode B Forward Bias

I

= 0µA

SNK

Diode A Forward Bias,

Diode B Reverse Bias

I

= 0µA

SNK

Overvoltage Protection (LTC4413-2 Only)

Diode A Reverse Bias,

Diode B Forward Bias

= 11µA

= 0µA

An overvoltage condition is detected whenever the over-

voltage input (OVI) pin is pulled above 6V. The condition

persistsuntiltheOVIvoltagefallsbelow5.6V.Theovervolt-

age protection (OVP) output is low unless an overvoltage

conditionisdetected.Ifanovervoltageconditionispresent,

the OVP output is pulled up to the voltage applied to the

OVI input. This output signal can be used to enable or

disable an external PFET that is placed between the input

that is the source of the excessive voltage and the input to

theLTC4413-2, thuseliminatingthepotentialdamagethat

may occur to the LTC4413-2 if its input voltage exceeds

the absolute maximum voltage of 6V. See the Applica-

tions Information section Dual Battery Load Sharing with

Automatic Switchover to a Wall Adapter with Overvoltage

Diode A Reverse Bias,

Diode B Reverse Bias

Low

High

Low

High

Diode A Forward Bias,

Diode B Disabled

Diode A Reverse Bias,

Diode B Disabled

= 11µA

= 0µA

Diode A Disabled,

Diode B Forward Bias

Diode A Disabled,

Diode B Reverse Bias

= 11µA

Diode A Disabled,

Diode B Disabled

441312fg

11

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

applicaTions inForMaTion

Introduction

the gate voltage of MP2, causing it to conduct. This status

signal can be used to provide information as to whether

the wall adapter (or BATB) is supplying the load current.

If the wall adapter voltage exceeds the OVI trip threshold

TheLTC4413-1/LTC4413-2areintendedforpowercontrol

applications that include low loss diode OR’ing, fully au-

tomatic switchover from a primary to an auxiliary source

of power, microcontroller controlled switchover from

a primary to an auxiliary source of power, load sharing

between two or more batteries, charging of multiple bat-

teriesfromasinglechargerandhighsidepowerswitching.

(V

) then the wall adapter is disconnected via the

OVIH

external PFET, MP1. The OVI voltage can be monitored

(through a voltage divider if necessary) to determine if

an overvoltage condition is present.

Capacitor C2 is required to dynamically pull up on the

gate of PFET MP1 if a fast edge occurs at the wall adapter

input during a hot plug. In the event that capacitor C2 (or

the gate-to-source of MP1) is precharged below the OVI

rising threshold. When a high voltage spike occurs, the

OVP output cannot guarantee turning off MP1 before the

load voltage exceeds the absolute maximum voltage for

the LTC4413-2. This may occur in the event that the wall

adapter suddenly steps from 5.5V to a much higher value.

In this case, a Zener diode is recommended to keep the

output voltage to a safe level.

Dual Battery Load Sharing with Automatic Switchover

to a Wall Adapter with Overvoltage Protection

(LTC4413-2 Only)

An application circuit for dual battery load sharing with

automatic switchover of load from batteries to a wall

adapter is shown in Figure 2. When the wall adapter is not

present,whicheverbatteryhasthehighervoltageprovides

theloadcurrentuntilithasdischargedtothevoltageofthe

other battery. The load is shared between the two batter-

ies 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 output

voltage rises as the body diode in MP2 conducts. When

the output voltage is larger than the battery voltages, the

LTC4413 turns off and very little load current is drawn

from the batteries. At this time, the STAT pin pulls down

Automatic PowerPath Control

Figure 3 illustrates an application circuit for microcon-

troller monitoring and control of two power sources. The

microcontroller’s analog inputs (perhaps with the aid of

a resistor voltage divider) monitor each supply input and

theLTC4413-1status,andthencommandstheLTC4413-1

through the two ENBA/ENBB control inputs.

MP1

MP2

IRLML6402 IRLML6402

WALL

ADAPTER

INPUT

C1

R

STAT

0.10µF

470k

JACK

R1

1Ω

C2

10nF

MICROCONTROLLER

OPTIONAL

6.2V

DFLZ6V2-7

PRIMARY

1

2

10

9

INA

OUTA

STAT

BATA

+

INA

OUTA

1

2

10

9

POWER

LOAD

TO LOAD

C

SOURCE

A

IDEAL

10µF

ENBA

STAT

ENBA

STAT

LTC4413-2

R

A

1Ω

R

LTC4413-1

STAT

10nF

3

4

3

4

8

7

470k

GND

OVI

STAT

OVP

ENBB

INB

ENBB

INB

OVP

OUTB

441312 F02

AUXILIARY

POWER

SOURCE

5

OUTB

6

BATB

+

5

6

C1

4.7µF

C1: C1206C106K8PAC

C2: C0403C103K8PAC

OUT

C

10µF

B

C

OUT

4.7µF

IDEAL

441312 F03

C

: C1206C475K8PAC

R

B

1Ω

Figure 2

Figure 3

441312fg

12

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

applicaTions inForMaTion

Automatic Switchover from a Battery to an Auxiliary

Supply, or a Wall Adapter with Overvoltage Protection

Capacitor C2 is required to dynamically pull up on the

gate of MP1 if a fast edge occurs at the wall adapter input

during a hot plug. If the wall adapter voltage is precharged

when an overvoltage spike occurs, the OVP voltage may

not discharge capacitor C2 in time to protect the output.

In this event, a Zener diode is recommended to protect

the output node until MP1 is turned off.

Figure 4 illustrates an application circuit where the

LTC4413-2 is used to automatically switch over between

a battery, an auxiliary power supply and a wall adapter.

When the battery is supplying load current, OVP is at GND

and STAT is high. If a higher supply is applied to AUX, the

BAT will be disconnected from the load and the load is

powered from AUX. When a wall adapter is applied, the

body diode of MP2 forward biases. When the load voltage

exceeds the AUX (or BAT) voltage, the LTC4413-2 senses

this higher voltage and disconnects AUX (or BAT) from

the load. At the same time it pulls the STAT voltage to

GND, thereby turning on MP2. The load current is now

supplied from the wall adapter. If the wall adapter voltage

exceeds the OVI rising threshold, the OVP voltage rises

and turns off MP1, disconnecting the wall adapter from

the load. The output voltage collapses down to the AUX

(or BAT) voltage and the LTC4413-2 reconnects the load

to AUX (or BAT).

Multiple Battery Charging

Figure5illustratesanapplicationcircuitforautomaticdual

battery charging from a single charger. Whichever battery

has the lower voltage will receive the larger charging cur-

rent until both battery voltages are equal, then both are

charged.Whilebothbatteriesarechargingsimultaneously,

the higher capacity battery gets proportionally higher cur-

rent from the charger. For Li-Ion batteries, both batteries

achieve the float voltage minus the forward regulation

voltage of 15mV. This concept can apply to more than

two batteries. The STAT pin provides information as to

when the battery at OUTA is being charged. For intelligent

control, the ENBA/ENBB input pins can be used with a

microcontroller as shown in Figure 3.

MP1

MP2

IRLML6402 IRLML6402

WALL

ADAPTER

INPUT

C1

0.10µF

JACK

R1

1Ω

C2

10nF

OPTIONAL

6.2V

DFLZ6V2-7

BATTERY

CHARGER

INPUT

INA

OUTA

10

1

2

INA

OUTA

OVI

1

3

4

10

8

LOAD

BAT1

TO LOAD

+

V

+

CC

IDEAL

BAT

ENBA

GND

470k

LTC4413-1

STAT IS HIGH

WHEN BAT1 IS

CHARGING

LTC4413-2

3

4

9

6

7

9

R

STAT

GND

STAT

ENBB

OVP

STAT

OUTB

OVP

560k

ENBB

INB

OUTB

5

10nF

INB

5

2

6

STAT

LOAD

AUX

+

IDEAL

470k

IDEAL

BAT2

C

OUT

C1: C1206C106K8PAC

C2: C0403C103K8PAC

4.7µF

ENBA

441312 F05

441312 F04

C

: C1206C475K8PAC

OUT

Figure 4

Figure 5

441312fg

13

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

applicaTions inForMaTion

Automatic Switchover from a Battery to a Wall

Adapter and Charger with Overvoltage Protection

threshold, the OVP pin voltage rises, disconnecting both

the LTC4413-2 and the LTC4059 from potentially hazard-

ousvoltages. Whenthisoccurs, theloadvoltagecollapses

until it is below the BAT voltage causing the STAT voltage

to rise, disabling the battery charger. At the same time,

theLTC4413-2automaticallyreconnectsthebatterytothe

load. 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.

Figure6illustratestheLTC4413-2performingthefunction

of automatically switching a load over from a battery to a

walladapterwhilecontrollinganLTC4059batterycharger.

When no wall adapter is present, the LTC4413-2 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 MP1 (but below the OVI

threshold), the load voltage rises as the second ideal di-

ode conducts. As soon as the OUTA voltage exceeds the

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 a high voltage

wall adapter is inadvertently attached above the OVI rising

Capacitor C2 is required to dynamically pull up on the

gate of MP1 if a fast edge occurs at the wall adapter input

during a hot plug. If the wall adapter voltage is precharged

when an overvoltage spike occurs, the OVP voltage may

not discharge capacitor C2 in time to protect the output.

In this event, a Zener diode is recommended to protect

the output node until MP1 is turned off.

STAT

9

STAT

R

STAT

560k

INA

OUTA

10

1

2

TO

LOAD

ENB

BAT

IDEAL

LTC4059

+

ENBA

LTC4413-2

ENBB

V

PROG

Li-Ion

100k

CC

4

3

MP1

IRLML6402

Li/CC GND

GND

INB

OUTB

5

6

WALL

ADAPTER

INPUT

D1

OPTIONAL

DFLZ6V2-7

C

OUT

C1

10µF

1µF

IDEAL

4.7µF

JACK

OVP

OVI

C2

10nF

441312 F06

Figure 6

441312fg

14

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

applicaTions inForMaTion

Soft-Start Overvoltage Protection

an overvoltage event. When the overvoltage condition

ends, the OVP voltage drops slowly, depending on the

gate charge of the external PFET. This causes the external

In the event that a low power external PFET is used for

the external overvoltage protection device, care must be

taken to limit the power dissipation in the external PFET.

The operation of this circuit is identical to the “Automatic

Switchover from a Battery to a Wall Adapter” application

shown on the first page of this data sheet. Here, however,

the ideal diode from INA to INB is disabled by pulling up

on ENBA whenever an overvoltage condition is detected.

This channel is turned-off using a resistor connected to

OVP along with a 5.6V Zener diode, ensuring the abso-

lute maximum voltage at ENBA is not exceeded during

PFET to linger in a high R

region where it can dis-

DS(ON)

sipate a significant amount of heat depending on the load

current. To avoid dissipating heat in the external PFET, this

application delays turning on the ideal diode from INA to

OUTA, until the gate voltage of the external PFET drops

below V

, where the external PFET should safely be

ENBIL

out of the high R

region. This soft-start scheme can

DS(ON)

be used on either channel of the LTC4413-2.

FDR8508

WALL

INA

OUTA

IDEAL

ADAPTER

INPUT

C1

10µF

D1

OPTIONAL

C2

10nF

V

CC

R

STAT

R

ENBA

470k

560k

0.1µF

STAT

ENBA

STAT

OVI

D2

5.6V

LTC4413-2

1Ω

GND

ENBB

INB

OVP

OUTB

OVP

BAT

+

TO LOAD

C

OUT

IDEAL

4.7µF

441312 F07

C1: C0805C106K8PAC

C2: C0403C103K8PAC

OUT

STAT IS HIGH WHEN WALL ADAPTER IS

SUPPLYING LOAD CURRENT

OVP IS HIGH WHEN WALL ADAPTER

VOLTAGE > 6V

C

: C1206C475K8PAC

Figure 7

441312fg

15

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

package DescripTion

Please refer to http://www.linear.com/product/LTC4413-1#packaging for the most recent package drawings.

DD Package

10-Lead Plastic DFN (3mm × 3mm)

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

0.70 ±0.05

3.55 ±0.05

2.15 ±0.05 (2 SIDES)

1.65 ±0.05

PACKAGE

OUTLINE

0.25 ±0.05

0.50

BSC

2.38 ±0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

R = 0.125

0.40 ±0.10

TYP

6

10

3.00 ±0.10

(4 SIDES)

1.65 ±0.10

(2 SIDES)

PIN 1 NOTCH

R = 0.20 OR

PIN 1

TOP MARK

(SEE NOTE 6)

0.35 × 45°

CHAMFER

(DD) DFN REV C 0310

5

1

0.25 ±0.05

0.50 BSC

0.75 ±0.05

0.200 REF

2.38 ±0.10

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

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

441312fg

16

For more information www.linear.com/LTC4413-1

LTC4413-1/LTC4413-2

revision hisTory ^{(Revision history begins at Rev E)}

REV

DATE

07/15 Changed GND to SGND in Pin Configuration

Changed V to V in electrical characteristics

DESCRIPTION

PAGE NUMBER

E

2

3

ENB

ENBA,B

Changed ENB to ENBA,B last two plots

Changed ENB to ENBA,B last plot

4

5

Changed ENB to ENBA,B first plot and changed IN to INA,B

Changed exposed pad/SGND label

6

7

Added sentence to final paragraph and added A,B references

Changed to ENBA and ENBB on Tables 1 and 2

Added LTC4415 to Related Parts table

9

10

16

7

F

09/16 Changed y-axis on graph G27 to OVI-OVP

G

09/17 Changed MP2 diode connection Figures 2, 4

12, 13

441312fg

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.

For more information www.linear.com/LTC4413-1

17

LTC4413-1/LTC4413-2

Typical applicaTion

Automatic Switchover from a Battery to a Wall Adapter with Soft-Start Overvoltage Protection

FDR8508

WALL

ADAPTER

INPUT

INA

OUTA

C1

10µF

D1

OPTIONAL

IDEAL

C2

10nF

V

CC

R

STAT

R

ENBA

470k

560k

0.1µF

STAT

ENBA

STAT

D2

5.6V

LTC4413-2

1Ω

GND

OVI

ENBB

INB

OVP

OUTB

OVP

BAT

+

TO LOAD

C

OUT

IDEAL

4.7µF

441312 F07

C1: C0805C106K8PAC

C2: C0403C103K8PAC

OUT

STAT IS HIGH WHEN WALL ADAPTER IS

SUPPLYING LOAD CURRENT

OVP IS HIGH WHEN WALL ADAPTER

VOLTAGE > 6V

C

: C1206C475K8PAC

relaTeD parTs

PART NUMBER

DESCRIPTION

COMMENTS

LTC1558/LTC1559

Backup Battery Controller with Programmable Output

Adjustable Backup Voltage from 1.2V NiCd Button Cell, Includes Boost

Converter

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

No External MOSFET, Sense Resistor or Blocking Diode Required,

Charge Current Monitor for Gas Gauging, C/10 Charge Termination

LTC4350

LTC4411

Hot Swappable Load Share Controller

2.6A Low Loss Ideal Diode in ThinSOT

PowerPath Controller in ThinSOT

Allows N + 1 Redundant Supply, Equally Loads Multiple Power

Supplies Connected in Parallel

No External MOSFET, Automatic Switching Between DC Sources,

Simplified Load Sharing

LTC4412/

LTC4412HV

More Efficient than Diode OR’ing, Automatic Switching Between DC

Sources, Simplified Load Sharing, 3V ≤ V ≤ 28V, 3V ≤ V ≤ 36V

IN IN

(HV)

LTC4413

LTC4414

Lower Quiescent Current with Slower Response Time

Dual 2.6A, 2.5V to 5.5V, Ideal Diodes in 3mm × 3mm DFN

36V, Low Loss PowerPath Controller for Large PFETs

Drives Large Q PFETs, Very Low Loss Replacement for Power Supply

G

O’Ring Diodes, 3.5V to 36V AC/DC Adapter Voltage Range, 8-Lead

MSOP Package

LTC4415

Dual 4A Ideal Diodes with Adjustable Current Limit

1.7V to 5.5V Operating Range, 50mΩ PMOS, Soft-Start, 15mV

Forward Drop, MSOP-16 and 3mm × 5mm DFN-16 Packages

441312fg

LT 0917 REV G • PRINTED IN USA

www.linear.com/LTC4413-1

 LINEAR TECHNOLOGY CORPORATION 2006

18

For more information www.linear.com/LTC4413-1


型号：	LTC4413EDD-1#PBF
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18页 (文件大小：246K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC4413EDD-1#PBF [Linear]

相关型号：

LTC4413EDD-1#TR

LTC4413EDD-1#TRPBF

LTC4413EDD-2

LTC4413EDD-2#PBF

LTC4413EDD-2#TR

LTC4413EDD1

LTC4413EDD1#PBF

LTC4413EDD1#TR

LTC4413EDD1#TRPBF

LTC4413EDD1-PBF

LTC4413EDD1-TR

LTC4413EDD1-TRPBF