LTC4413-2_技术文档

LTC4415

Dual 4A Ideal Diodes with

Adjustable Current Limit

FeaTures

DescripTion

The LTC^®4415 contains two monolithic PowerPath ideal

diodes, each capable of supplying up to 4A with typical

forwardconductionresistanceof50mΩ.Thediodevoltage

dropsareregulatedto15mVduringforwardconductionat

low currents, extending the power supply operating range

and ensuring no oscillations during supply switchover.

Less than 1µA of reverse current flows from OUT to IN

making this device well suited for power supply ORing

applications.

n

Dual 50mΩ Monolithic Ideal Diodes

n

1.7V to 5.5V Operating Range

n

Up to 4A Adjustable Current Limit for Each Diode

n

Low Reverse Leakage Current (1µA Max)

n

15mV Forward Drop in Regulation

n

Smooth Switchover in Diode ORing

n

Load Current Monitor

n

Precision Enable Thresholds to Set Switchover

n

Soft-Start to Limit Inrush Current on Start-Up

n

Status Pins to Indicate Forward Diode Conduction

The two ideal diodes are independently enabled and

prioritized using inputs EN1 and EN2. The output current

limits can be adjusted independently from 0.5A to 4A

using resistors on the CLIM pins. Furthermore, the ideal

diode currents can be monitored via CLIM pin voltages.

n

Current and Thermal Limit with Warning

n

Thermally Enhanced 16-Lead MSOP and DFN

(3mm × 5mm) Packages

applicaTions

Open-drain status pins indicate when the ideal diodes are

forwardconducting.Whenthedietemperatureapproaches

thermal shutdown, or if the output load exceeds the cur-

rent limit threshold, the corresponding warning pins are

pulled low.

n

High Current PowerPath™ Switch

n

Battery and Wall Adapter Diode ORing

n

Backup Battery Diode ORing

n

Logic Controlled High Current Power Switch

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

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

n

Supercapacitor ORing

n

Multiple Battery Sharing

Typical applicaTion

Forward Characteristics of LTC4415

vs MBRS410E Schottky

Prioritized Power Supply ORing

CURRENT LIMIT

4

IDEAL

PRIMARY

POWER

SOURCE

IN1

OUT1

TO

LOAD

LTC4415

4.7µF

100k

LTC4415

3

2

1

0

EN1

CLIM1

CLIM2

SCHOTTKY

DIODE

STAT1

21.5k

MBRS410E

WARN1

WARN2

STAT2

124Ω 124Ω

R

= 50mΩ

ON

EN2

IDEAL

GND

OUT2

IN2

SECONDARY

POWER

+

4415 TA01a

SOURCE

0

100

200

300

400

500

FORWARD VOLTAGE DROP (mV)

4415 TA01b

4415fa

1

LTC4415

absoluTe MaxiMuM raTings ^{(Note 1)}

IN1, IN2, OUT1, OUT2, CLIM1, CLIM2,

Storage Temperature Range .................. –65°C to 150°C

Peak Reflow Temperature .....................................260°C

STAT1, STAT2, WARN1, WARN2 Voltage....... –0.3V to 6V

EN1, EN2 Voltage ................. –0.3V to Max (V , V

Operating Junction Temperature Range

)

INx OUTx

(Notes 3, 4) .............................................–40°C to 125°C

pin conFiguraTion

TOP VIEW

IN1*

1

2

3

4

5

6

7

8

16 OUT1*

15 OUT1*

14 STAT1

13 WARN1

12 WARN2

11 STAT2

10 OUT2*

TOP VIEW

1

2

3

4

5

6

7

8

OUT1*

STAT1

WARN1

WARN2

STAT2

OUT2*

IN1*

16

15

14

13

12

11

10

9

EN1

CLIM1

CLIM2

EN2

17

GND

17

GND

CLIM1

CLIM2

EN2

IN2*

MSE PACKAGE

16-LEAD PLASTIC MSOP

IN2*

9

OUT2*

T

= 125°C, θ = 35°C/W TO 40°C/W

JA

JMAX

DHC PACKAGE

VARIATION A

16-LEAD (5mm × 3mm) PLASTIC DFN

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB

*ADJACENT PINS ON THE FOUR CORNERS ARE FUSED TOGETHER INTERNALLY.

T

= 125°C, θ = 43°C/W

JMAX

JA

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB

*ADJACENT PINS ON THE FOUR CORNERS ARE FUSED TOGETHER

orDer inForMaTion

LEAD FREE FINISH

LTC4415EDHC#PBF

LTC4415IDHC#PBF

LTC4415EMSE#PBF

LTC4415IMSE#PBF

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

–40°C to 125°C

LTC4415EDHC#TRPBF

LTC4415IDHC#TRPBF

LTC4415EMSE#TRPBF

LTC4415IMSE#TRPBF

4415

16-Lead (5mm × 3mm) Plastic DFN

16-Lead Plastic MSOP

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/

4415fa

2

LTC4415

elecTrical characTerisTics ^Thel denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T_A= 25°C (Notes 2, 3). V_IN1= V_IN2= 3.6V, R_CLIM= 250Ω, unless otherwise

specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

l

V

, V

IN2 OUT2

,

Operating Supply Range

At Least One Input/Output Must Be in This Range

1.7

5.5

V

IN1 OUT1

, V

V

Undervoltage Lockout

V

Rising

1.63

55

1.7

80

28

V

mV

UVLO

INx

Hysteresis

I

Quiescent Current In Forward Regulation

(Note 5)

V

IN1

V

IN2

= V

OUT2

= 3.6V, I = –1mA,

OUT1

44

µA

QF

EN1

EN2

= 0V, Measured Through GND Pin

Quiescent Current In Shutdown

V

= V = V

OUT1

= 3.6V, V

= 0V,

EN1

13

µA

QOFF

IN1

IN2

EN2

= V

= 0V, Measured Through GND Pin

OUT2

l

Reverse Turn-Off Current: OUT1

OUT2

V

= 3.6V, V

OUT1

= 3.7V, V = 3.5V, V = 3.6V

OUT2

18

5

40

11

µA

QR(OUT)

IN1

OUT1

IN2

(V

> V

)

OUT2

l

I

INx Pin Current In Reverse Turn-Off

INx Pin Leakage Current

V

= V = 5.5V

OUT2

4

10

1

µA

QR(IN)

OUT1

= V = 0V, V

= V = 5.5V

OUT2

–1

5

LEAK(IN)

IN1

IN2

OUT1

l

V

Forward Regulation Voltage (V – V

)

I

= –1mA

15

–30

18

25

–10

30

mV

mΩ

FR

INx

OUTx

Reverse Turn-Off Voltage (V – V )

OUTx

–50

RTO

INx

R

Forward Dynamic Resistance in

Regulation

I

= –100mA to –300mA

= –1A

FR

OUTx

R

On-Resistance in Constant Resistance

Mode

50

70

mΩ

ON

OUTx

t

PowerPath Turn-On Time (Notes 6, 7)

Before Enable V

= 1.5V, Diode 1

= 1.5V, Diode 2

= 0V

10

23

250

µs

ON

OUT1

OUT2

OUTx

t

PowerPath Turn-On from Shutdown

(Note 7)

Both Diodes Disabled and V

= 1.5V Before Enable

= 0V Before Enable

70

µs

ON(SD)

SWITCH

OUTx

320

PowerPath Switchover Time

9

µs

V

↑ (2.6V to 4.6V) to V

Starts Rising, Both

OUTx

INx

Diodes Enabled, OUT1 and OUT2 Tied Together

t

PowerPath Turn-Off Time

Disable to I Falling from 100mA to 1mA

2

µs

OFF

IN

Soft-Start Duration (Note 8)

V

OUTx

= 0V

ms

SS

Current Monitor

Current Monitor Ratio

I

/I

When I

= –4A

= –2A

0.9

0.8

1

1.1

1.2

mA/A

CLIMx OUTx

OUTx

/I

CLIMx OUTx

Current Limit

V

CLIM Clamp Voltage

In Current Limit

0.5

V

A

CLIM

l

I

Current Limit Adjustability

0.5

4

LIM(ADJ)

l

Accuracy of Adjustable Current Limit

Threshold

V

OUTx

V

OUTx

= V – 0.5V, Current Limit = 4A

8

15

%

INx

= V – 0.5V, Current Limit = 2A

INx

l

I

Internal Current Limit

R

CLIMx

= 0Ω, V = 0V

OUTx

6

9

A

LIM(INT)

T

Thermal Warning Threshold

Rising Temperature

Hysteresis

130

15

°C

WARN

T

SD

Thermal Shutdown Threshold

Rising Temperature

Hysteresis

160

20

°C

Open-Drain Status Outputs (STAT1, WARN1, STAT2, WARN2)

l

V

OL

Open-Drain Output Low Voltage

Current Into Open-Drain Output = 3mA

0.05

0

0.4

1

V

Open-Drain Output High Leakage Current Open-Drain Output Voltage = 5.5V

µA

t

STAT Turn-On Time (Note 6)

EN1 Rising to STAT1 Pull-Down

EN2 Falling to STAT2 Pull-Down

5

18

µs

STAT(ON)

4415fa

3

LTC4415

elecTrical characTerisTics ^Thel denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T_A= 25°C (Notes 2, 3). V_IN1= V_IN2= 3.6V, R_CLIM= 250Ω, unless otherwise

specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

2

MAX

UNITS

µs

t

STAT Turn-Off Time

WARN Turn-On Time

WARN Turn-Off Time

Disable to STAT Pull-Up

STAT(OFF)

WARN(ON)

WARN(OFF)

Current Limit to WARN Pull-Down

Out of Current Limit to WARN Pull-Up

500

5

µs

Enable Inputs (EN1, EN2)

l

V

EN1 Rising and EN2 Falling Thresholds

EN1 and EN2 Hysteresis

760

800

55

0

840

1

mV

µA

ENTH

ENHYST

Enable Pin Current When Pulled High

V

EN1

= V

= 3.6V

EN2

Note 4: The LTC4415 includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 5: One channel enabled. Quiescent current is identical for each

channel.

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

current out of a pin is negative.

Note 3: The LTC4415 is tested under pulsed load conditions such that

Note 6: Enable inputs are driven to supply levels. Other diode is already

enabled so the chip bias circuits are active.

T ≈ T . The LTC4415E is guaranteed to meet performance specifications

J

A

from 0°C to 85°C. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC4415I is guaranteed

over the full –40°C to 125°C operating junction temperature range.

Note 7: Turn-on time is measured from enable to I

rising through

OUTx

1mA. When the output voltage is more than 1.2V, soft-start is disabled and

turn-on is faster.

The junction temperature (T in °C) is calculated from the ambient

Note 8: Current ramps from zero to the current limit during the soft-start

duration. Soft-start is measured from 10% to 90% of the current limit. If

the load condition is such that the current does not need to go up to the

current limit during start-up, the output voltage may reach steady state

sooner.

J

temperature (T in °C) and power dissipation (P in Watts) according to

A

D

the formula:

T = T + (P • θ )

JA

J

A

D

Note that the maximum ambient temperature consistent with these

specifications is determined by specific operating conditions in

conjunction with board layout, the rated package thermal impedance and

other environmental factors.

Typical perForMance characTerisTics

T_A= 25°C, V_IN1= V_IN2= 3.6V, R_CLIM= 250Ω unless otherwise noted.

On-Resistance vs Temperature

I-V Characteristics

On-Resistance vs V_IN

4

3

2

1

0

80

70

80

70

60

50

40

30

20

R

CLIM

= 124Ω

60

50

40

30

20

125°C

90°C

25°C

–40°C

75 100

0

50

100

150

200

250

–50 –25

0

25 50

125 150

1

2

3

4

5

6

TEMPERATURE (°C)

INPUT VOLTAGE (V)

FORWARD VOLTAGE DROP (mV)

4415 G01

4415 G02

4415 G03

4415fa

4

LTC4415

Typical perForMance characTerisTics

T_A= 25°C, V_IN1= V_IN2= 3.6V, R_CLIM= 250Ω unless otherwise noted.

Reverse Leakage Current

vs Temperature

Quiescent Current vs Temperature

Quiescent Current vs V_IN

100

80

100

80

60

40

20

0

10µ

1µ

V

= 0V

IN

BOTH DIODES ON

100n

10n

1n

V

= 5.5V

60

OUT

ONE DIODE ON (I

)

QF

ONE DIODE ON (I

)

QF

V

= 3.6V

OUT

40

20

0

BOTH DIODES OFF (I

)

BOTH DIODES OFF (I

)

QOFF

100p

10p

75 100

–50 –25

0

25 50

125 150

50

2

4

–50 –25

0

25

75 100 125 150

1

3

5

6

TEMPERATURE (°C)

INPUT VOLTAGE (V)

4415 G04

4415 G05

4415 G06

Quiescent Current

vs Output Current

Short-Circuit Current

vs Temperature

Current Limit vs Output Voltage

100

80

60

40

20

0

7

6

5

7

6

V

= 3.6V

V

= 0V

OUT

IN

R

= 0Ω

CLIM

CURRENT LIMIT

R

= 0Ω

CLIM

5

R

= 124Ω

CLIM

R

= 124Ω

= 249Ω

CLIM

4

3

2

1

0

4

3

2

1

R

= 249Ω

CLIM

R

CLIM

R

= 1000Ω

3

R

= 1000Ω

CLIM

R

CLIM

= 124Ω

0

1

2

3

4

5

0

1

2

4

–25

0

50 75 100 125 150

25

TEMPERATURE (°C)

–50

OUTPUT CURRENT (A)

OUTPUT VOLTAGE (V)

4415 G07

4415 G08

4415 G09

Current Monitor Ratio

vs Temperature

Current Monitor Ratio vs I_OUT

1.30

1.20

1.10

1.00

0.90

0.80

0.70

1.30

1.20

1.10

1.00

0.90

0.80

0.70

DEVICE 1 (HIGH RATIO)

DEVICE 2

DEVICE 3 (LOW RATIO)

I

= 2A

CLIM

OUT

R

CLIM

= 124Ω

R

= 124Ω

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

1

2

3

0

4

OUTPUT CURRENT (A)

4415 G10

4415 G11

4415fa

5

LTC4415

Typical perForMance characTerisTics

T_A= 25°C, V_IN1= V_IN2= 3.6V, R_CLIM= 250Ω unless otherwise noted.

Enable and Disable Response for

Large Load Capacitor

Enable and Disable Response for

Small Load Capacitor

Switchover in Diode-OR

Application

V

= 4.6V

= 3.6V

IN2

IN1

V

OUT1

V

,

IN1

2V/DIV

IN2

1V/DIV

I

IN1

V

= 2.6V

IN2

2A/DIV

I

IN1

2A/DIV

WARN1

5V/DIV

V

OUT1,2

1V/DIV

WARN1

5V/DIV

3.55V

STAT1

5V/DIV

EN1

STAT1

5V/DIV

EN1

STAT1

5V/DIV

STAT2

5V/DIV

4415 G12

4415 G13

4415 G17

C

R

= 1200µF 1ms/DIV

= 8Ω

C

= 47µF

= 8Ω

1ms/DIV

C

= 47µF

20µs/DIV

(SHORTED)

OUT1

LOAD1

OUT1

OUT

R

LOAD1

R

= 3.6Ω

LOAD

OUT1

V

= V

OUT2

Short-Circuit Response

at Heavy Load

Load Step Response

Short-Circuit Response

3.6V

V

IN

3.6V

V

IN

5V/DIV

IN

0.5V/DIV

5V/DIV

V

OUT

5V/DIV

OUT

3.6V

5V/DIV

V

OUT

0.5V/DIV

WARN

5V/DIV

3.5A

I

OUT

10A/DIV

I

OUT

I

IN

5A/DIV

2A/DIV

0.1A

10mA

1A

4415 G14

4415 G15

4415 G16

C

R

= 47µF

= 8Ω

CLIM

40µs/DIV

C

R

= 4.7µF

= 167Ω

100µs/DIV

C

= 4.7µF

= 167Ω

40µs/DIV

OUT

LOAD

OUT

CLIM

OUT

R

CLIM

= 124Ω

UVLO Thresholds vs Temperature

EN1 Thresholds vs Temperature

EN2 Thresholds vs Temperature

1.650

0.900

0.875

0.850

0.825

0.800

0.775

0.750

0.725

0.700

0.900

0.875

0.850

0.825

0.800

0.775

0.750

0.725

0.700

RISING (TURN OFF)

RISING (TURN ON)

1.630

1.610

FALLING (TURN ON)

RISING (TURN ON)

1.590

1.570

1.550

FALLING (TURN OFF)

50

TEMPERATURE (°C)

–50 –25

0

25

75 100 125 150

50 75

TEMPERATURE (°C)

50 75

TEMPERATURE (°C)

–50 –25

0

25

100 125 150

–50 –25

0

25

100 125 150

4415 G18

4415 G19

4415 G20

4415fa

6

LTC4415

Typical perForMance characTerisTics

T_A= 25°C, V_IN1= V_IN2= 3.6V, R_CLIM= 250Ω unless otherwise noted.

Power Loss vs Output Current

Efficiency vs Output Current

100

1.0

0.8

0.6

0.4

0.2

0

R

= 124Ω

R

= 124Ω

CLIM

99

98

97

96

95

94

93

92

91

90

125°C

25°C

–40°C

125°C

25°C

–40°C

1

2

3

2

4

0

4

0

1

3

OUTPUT CURRENT (A)

4415 G21

4415 G22

pin FuncTions

IN1 (Pins 1, 2): Diode 1 Anode and Positive Power Supply

for LTC4415. Bypass IN1 with a ceramic capacitor of at

least4.7µF. Pins1and2arefusedtogetheronthepackage.

These pins can be grounded when not used.

EN2 (Pin 6): Enable Input for Diode 2. A low signal less

than V

enables Diode 2.

ENTH

IN2 (Pins 7, 8): Diode 2 Anode and Positive Power Supply

for LTC4415. Bypass IN2 with a ceramic capacitor of at

least4.7µF. Pins7and8arefusedtogetheronthepackage.

These pins can be grounded when not used.

EN1(Pin3):EnableInputforDiode1. Ahighsignalgreater

than V

enables Diode 1.

ENTH

CLIM1 (Pin 4): Current Limit Adjust and Monitor Pin for

Diode 1. Connect a resistor from CLIM1 to ground to set

thecurrentlimit;thediode1currentcanthenbemonitored

bymeasuringthevoltageonCLIM1pin. Afixed6Ainternal

current limit is active when this pin is shorted to ground.

Do not leave this pin open. Minimize stray capacitance

on this pin to generally less than 200pF (see Applications

Information for more details).

OUT2(Pins9,10):Diode2CathodeandOutputofLTC4415.

Bypass OUT2 with a ceramic capacitor of at least 4.7µF.

Pins 9 and 10 are fused together on the package. Leave

these pins open when not used.

STAT2 (Pin 11): Status Indicator for Diode 2. Open-drain

output pulls down during forward diode conduction. This

pin can be left open or grounded when not used.

WARN2 (Pin 12): Overcurrent and Thermal Warning

Indicator for Diode 2. Open-drain output pulls down when

diode2currentexceedsitscurrentlimitordietemperature

is close to thermal shutdown.

CLIM2 (Pin 5): Current Limit Adjust and Monitor Pin for

Diode 2. Connect a resistor from CLIM2 to ground to set

thecurrentlimit;thediode2currentcanthenbemonitored

bymeasuringthevoltageonCLIM2pin. Afixed6Ainternal

current limit is active when this pin is shorted to ground.

Do not leave this pin open. Minimize stray capacitance

on this pin to generally less than 200pF (see Applications

Information for more details).

WARN1 (Pin 13): Overcurrent and Thermal Warning

Indicator for Diode 1. Open-drain output pulls down when

diode1currentexceedsitscurrentlimitordietemperature

is close to thermal shutdown.

4415fa

7

LTC4415

pin FuncTions

STAT1 (Pin 14): Status Indicator for Diode 1. Open-drain

output pulls down during forward diode conduction. This

pin can be left open or grounded when not used.

GND (Exposed Pad Pin 17): Device Ground. The exposed

pad must be soldered to PCB ground to provide both

electrical connection to ground and good thermal con-

ductivity to PCB.

OUT1 (Pins 15, 16): Diode 1 Cathode and Output of

LTC4415.BypassOUT1withaceramiccapacitorofatleast

4.7µF. Pins 15 and 16 are fused together on the package.

Leave these pins open when not used.

block DiagraM

I

OUT1

1000

CLIM1

4

OUT1

IN1

1, 2

15, 16

P1

UVLO1

OUT1

GATE

DRIVER

CURRENT

WARN1

STAT1

CLIM2

EN1

LIMIT

13

14

5

3

TEMPERATURE

SENSOR

I

OUT2

1000

OUT2

9, 10

IN2

7, 8

P2

UVLO2

OUT2

GATE

DRIVER

CURRENT

LIMIT

WARN2

STAT2

EN2

12

11

6

TEMPERATURE

SENSOR

4415 BD

4415fa

8

LTC4415

operaTion

The LTC4415 consists of two PowerPath ideal diode cir-

cuits within a single package. Each diode in the LTC4415

iscapableofsupplyingamaximumratedoutputcurrentof

4A from its input supply with typical forward conduction

resistance of 50mΩ.

CONSTANT CURRENT

1

I

LIM

SLOPE =

CONSTANT

RESISTANCE

R

ON

The diodes are enabled using level-sensitive enable inputs

EN1 and EN2 with opposite polarity to achieve a prioritizer

function with minimal quiescent current during diode-OR

implementation. The enable threshold on the enable pins

1

FR

SLOPE =

CONSTANT

VOLTAGE

R

(V

) is 800mV (typical) with one-sided hysteresis of

4415 F01

ENTH

V

FORWARD VOLTAGE (V)

FR

55mV (typical). For rising voltage on the EN1 pin, Diode 1

is enabled when V > 800mV (typical), and on the fall-

Figure 1. Forward Characteristics of LTC4415

EN1

ing edge it is disabled when V

< 745mV (typical). For

EN1

When the output of either diode is driven higher than its

inputbyanalternatesupply,conductionthroughthatdiode

is suspended to prevent reverse conduction from OUT1/

OUT2 to IN1/IN2. This function allows implementation of

a power supply OR function by simply tying the outputs

OUT1 and OUT2 together.

falling voltage on the EN2 pin, Diode 2 is enabled when

< 800mV (typical), and on the rising edge it is dis-

V

EN2

abled when V

> 855mV (typical). EN1 or EN2 pin volt-

EN1

ages should not exceed the highest voltage on the input

(IN1, IN2) or output (OUT1, OUT2) pins.

Forward conduction of the LTC4415 diodes has three op-

erating ranges as a function of the load current, as shown

in Figure 1 and described below:

Current Limit Setting

The output current limit of each diode can be set inde-

pendently by connecting resistors from the current limit

adjust pins CLIM1 and CLIM2 to ground. The current out

of the CLIM1 and CLIM2 pins are 1/1000 of the ideal diode

1. For small load current, a low forward voltage drop

(V = 15mV typical) is maintained by modulating the

FR

series resistance offered by the PFETs (P1/P2) in the

output currents I

and I

respectively. When the

OUT1

OUT2

current paths as shown in the Block Diagram. This op-

load currents increase so that the CLIM1 or CLIM2 pin

voltagesexceeds0.5V,theLTC4415detectsanovercurrent

condition and regulates the current to a fixed value. The

erating mode is referred to as constant V regulation.

FR

Inbattery-poweredandlowheadroomapplications,the

low forward drop of the ideal diodes extend the operat-

ing range beyond that of Schottky diodes.

required value of resistor R

for output current limit

CLIM

of I is calculated as follows:

LIM

2. At higher load currents, the LTC4415 gate driver can

no longer modulate the series resistance of the PFETs

(P1/P2) to maintain constantforward drop. This transi-

tion occurs when the gate voltage of the series PFETs

(P1/P2) has been brought down to GND. The ideal

diodes subsequently operate with constant resistance,

0.5V

R_CLIM=1000•

I_LIM

The allowed range of R

is 125Ω to 1000Ω unless the

CLIM

CLIM1/CLIM2 pins are shorted to GND, in which case

the LTC4415 limits the load current using a fixed internal

current limit of 6A.

R , between inputs and outputs, IN1/IN2 and OUT1/

ON

OUT2, respectively.

3. As the load current exceeds the current limit, the series

PFETs offer higher resistance between IN1/IN2 and

OUT1/OUT2 by reducing the gate drive in order to limit

the load current; so the forward voltage drop increases

rapidly. This operating mode is referred to as constant

current operation.

Overcurrent Status

When either of the ideal diodes is operating in current

limit, the corresponding warning pin, WARN1/WARN2,

is pulled low by an open-drain NFET after a 500µs delay.

Normaloperationresumesandthewarningpinisreleased

4415fa

9

LTC4415

operaTion

when the load current decreases below the current limit.

Power consumption in LTC4415 increases during opera-

tion in current limit due to the large voltage drop across

the PFET devices (P1 or P2).

die temperature exceeds the warning threshold (130°C),

theWARN1/WARN2pinsarepulleddownwithopen-drain

NFETs while the LTC4415 continues to operate normally.

Thisgivessometimefortheusertoreducetheloadcurrent

to avoid thermal shutdown. The warning signal is deas-

sertedwhenthedietemperaturecoolsdownbelow115°C.

Load Current Monitor

The current limit pins output 1/1000th of the ideal diode

output current. The voltage across the current limit resis-

tor can be measured to monitor the current through each

ideal diode as follows:

Thermal shutdown is triggered when the internal die

temperatureincreasesbeyondthefaultthreshold(160°C).

Status pins, STAT1/STAT2, are deasserted during thermal

shutdown to indicate the interruption in forward condi-

tion. Normal operation resumes when the die temperature

cools below 140°C. Note that prolonged operation at the

overtemperature condition degrades device reliability.

V_CLIM

I_OUT=1000•

R_CLIM

Note that the current monitor function via V

available when CLIM pins are grounded to use the fixed

internal current limit.

is not

Figure 2 shows WARN followed by thermal shutdown

caused by an output short-circuit to ground. Time to

thermalshutdownvariesdependingonpowerdissipation,

ambient temperature and board layout. The output cur-

rent ramps up after the device cools down below 140°C,

but shuts down repeatedly as the device overheats due

to persistent short.

CLIM

Soft-Start

An internal soft-start is included for each ideal diode to

minimize the start-up inrush current. When either of the

diodes start forward conduction, the load current ramps

from zero to the set current limit over a period of 2ms. The

soft-start can be monitored by observing the CLIM1 and

CLIM2 pin voltages when they are connected to grounded

resistors. Soft-start duration is reduced to 0.5ms (typical)

when the CLIM pins are grounded. In order to minimize

output droop during switchover between input sources

in power supply ORing applications, soft-start is disabled

when the output voltage is above 1.2V.

V

OUT

OUTPUT SHORTED

TO GND

2V/DIV

I

OUT

2A/DIV

RESTART DUE TO

THERMAL HYSTERESIS

THERMAL

SHUTDOWN

STAT

5V/DIV

WARN

5V/DIV

Forward Conduction Status Monitor

4415 F02

V

R

C

= 3.6V

10ms/DIV

IN

Active low open-drain output status signals, STAT1 and

STAT2, indicate the forward conduction status of each

ideal diode. With resistor pull-ups on these status pins,

a low voltage indicates forward conduction from input to

output, IN1/IN2 to OUT1/OUT2, respectively. The status

pinsgotohighimpedancewhentherespectiveidealdiodes

are disabled, during reverse turn-off conditions, or during

thermal shutdown.

= 124Ω

CLIM

= 4.7µF

OUT

Figure 2. Current Limit Warning and

Thermal Shutdown on Output Short Circuit

The thermal sensors are independent for each diode to

warn of, or shut down the heat generating path so that it

does not hinder the normal operation of the other path.

Depending on the amount of heat generated, the whole

die may still heat up and eventually shut down the other

channel.

Thermal Warning and Shutdown

Thermal sensors within the LTC4415 monitor the die tem-

perature when either of the diodes are enabled. When the

4415fa

10

LTC4415

operaTion

Undervoltage Lockout

The diode conduction path is turned off and the status

signal, STAT1/STAT2, is deasserted during an undervolt-

age condition.

Each ideal diode contains an independent UVLO control

circuitsothatoneinputexperiencingundervoltagelockout

does not hinder normal operation of the other channel.

applicaTions inForMaTion

Stability Considerations

or switching, disable, or even thermal shutdown. Limit

inductance and/or increase bypass capacitors to prevent

pin voltages from exceeding the absolute maximum rat-

ing of 6V. Some ESR in these capacitors may be helpful

in dampening the resonances and minimizing the ringing

caused by hot plugging or load switching. Refer to Ap-

plication Note 88, entitled, “Ceramic Input Capacitors Can

Cause Overvoltage Transients” for a detailed discussion

and mitigation of this phenomenon.

Any capacitance on the CLIM pins adds a pole to the cur-

rent control loop. Therefore, stray capacitance on these

pins must be kept to a minimum. Although the maximum

allowed value of the current limit adjust resistor is 1000Ω,

any additional capacitance on these pins reduces the

maximum allowed resistance, consequently increasing

the minimum allowed current limit. For stable operation,

the pole frequency at the CLIM pins should be kept above

800kHz. Therefore, if the CLIM pin parasitic capacitance

The values of the input and output decoupling capacitors

also depends on the maximum allowable droop during

switchoverinpowersupplyORingapplications.Typicaldu-

rationforLTC4415idealdiodestoswitchoverfromreverse

is C , the following equation should be used to calculate

P

the maximum allowed resistor R

:

CLIM

1

R_CLIM

≤

turn-offtoforwardconduction, t

, is9µs. Therefore,

SWITCH

2π •800kHz •C_P

the minimum decoupling capacitance, C, required for a

specified maximum output voltage droop, ∆V, when one

of the input voltages drops, can be calculated as follows:

When the voltage at the CLIM pins are monitored using a

long cable, such as an oscilloscope probe, decouple the

parasitic capacitance of the probe and the monitor system

using a series resistor as shown in Figure 3, where a 20k

resistor has been added between the CLIM pin and the

probe to ensure stable operation.

I_LOAD•t_SWITCH

C=

∆V

where I

is the load current at the time of switchover.

LOAD

For example, the required value of output capacitance for

a 100mV maximum droop in the output voltage during

quickswitchoverat1Aloadwouldbe100µF.Notethatboth

supplies share the load during switchover, and therefore

reduce the droop, when the voltage on the falling supply

pin changes slowly.

Input and Output Capacitors

Highcurrenttransientsthroughparasiticinductanceonthe

input and output sides of the ideal diodes can cause volt-

agespikesontheIN1/IN2/OUT1/OUT2pins.Thesecurrent

transients can occur on power plug-in, load disconnect

20k

CLIM

MONITOR

C

R

C

P

MONITOR

CLIM

4415 F03

Figure 3. Current Monitor with High Capacitance Probe/Instrument

4415fa

11

LTC4415

applicaTions inForMaTion

Board Layout Considerations

2. The traces to the input supplies, outputs and their

decoupling capacitors should be short and wide to

minimize the impact of parasitic inductance. Connect

the GND side of the capacitors directly to the ground

plane of the board. The decoupling capacitors provide

the transient current to the internal power MOSFETs

and their drivers.

When laying out the printed circuit board, the following

checklist should be followed to ensure proper operation

of the LTC4415:

1. Connecttheexposedpadofthepackage(Pin17)directly

to a large PC board ground to minimize thermal imped-

2

ance.Correctlysolderedtoa2500mm double-sided1oz

3. MinimizetheparasiticcapacitanceonCLIM1andCLIM2

pins for stable operation.

copperboard,theDFNpackagehasathermalresistance

(θ ) of approximately 43°C/W. Failure to make good

JA

contact between the exposed pad on the backside of

the package and an adequately sized ground plane re-

sults in much larger thermal resistance, raising the die

temperature for given power dissipation. An example

layout for double layer board is given in Figure 4. Via

holes are used in the board under and near the device

to conduct heat away from the device to the bottom

layer.

IN1

OUT1

EN1

CLIM1

CLIM2

EN2

STAT1

WARN1

WARN2

STAT2

IN2

OUT2

4415 F04

Figure 4. Example Board Layout for a Double-Sided PCB

4415fa

12

LTC4415

Typical applicaTions

Precision enable inputs and independent status outputs

provide flexibility in power supply back up and load share

applicationsusingthetwohighcurrentidealdiodecircuits

in the LTC4415, as shown in the following examples. The

features shown in these application circuits can be com-

bined in custom applications as needed.

Theenableoverlapminimizestheloadvoltagedroopduring

switchover. Both input power supplies provide power to

the load during the overlap. The status output pins can be

pulled up to the output voltage or to a logic power supply.

Automatic Switchover to a Backup Battery and Keep-

Alive Power Source

Prioritized Switchover to a Backup Battery

Figure 6 illustrates an application circuit for automatic

switchover to the backup battery if the primary power

source voltage falls below the backup battery voltage. The

wired-AND of the status outputs is used to drive the gate

of a pair of back-to-back connected external NMOS (M1

and M2) when both primary and backup power sources

are absent or below UVLO or during thermal shutdown of

LTC4415. Under these conditions, the keep-alive source

supplies power to critical components of the system. At

the same time, the wired-AND status output turns off

The application circuit, Figure 5, illustrates switchover

from a primary power source to backup power at a pre-

cise input voltage using the prioritized power supply-OR

application circuit. Diode 2 is enabled when the primary

power source voltage on diode 1 input falls below the

threshold given as follows:

R1+R2







V_IN1<0.8V • 1+







R3

As V falls further, diode 1 is disabled when the primary

KEEP ALIVE/

IN1

IDEAL

PRIMARY

POWER

COIN CELL

IN1

OUT1

powersourcevoltagefallsbelowthethresholddetermined

SOURCE

DMN2215UDM

by the resistor divider on enable pin EN1:

LTC4415

R1

47k

M1

M2

OPTIONAL

EN1

R1

R2+R3

CLIM1

CLIM2

STAT1

WARN1

WARN2

STAT2





V_IN1< 0.8V – V

• 1+

(

)







ENHYST



M3

The built-in hysteresis on the enable pins in the LTC4415

provides some overlap of diode enables around the swi-

tchover of power supplies. Resistor R2 can be optionally

used for additional overlap between the two supplies. The

additional overlap is given by:

EN2

IN2

IDEAL

OUT2

LOAD

47µF

GND

+

BACKUP

BAT

4415 F06

Figure 6. Automatic Switchover to a Backup Battery with Provision

for Keep-Alive Power to the Load When Both Are Absent

R2

R3

R2

R3

V_OVERLAP≈ V_ENTH

•

when

<<1

IDEAL

PRIMARY

IN1

OUT1

TO

LOAD

POWER

SOURCE

4.7µF

R1

R2

LTC4415

470k

EN1

470k

CLIM1

CLIM2

STAT1

WARN1

WARN2

STAT2

470k

R

CLIM2

CLIM1

R3

EN2

IDEAL

OUT2

IN2

SECONDAY

POWER

SOURCE

(BAT)

+

4415 F05

GND

Figure 5. Prioritized Power Supply ORing

4415fa

13

LTC4415

Typical applicaTions

non-critical high current loads. If the status resistors are

pulled up through the keep-alive power source itself as

shown in Figure 6, the output voltage is limited to:

Multiple Battery Charging

Figure7illustratesanapplicationcircuitforautomaticdual

battery charging from a single charger. The battery with

lower voltage receives larger charging current until both

battery voltages are equal, then both are charged. While

both batteries are charging simultaneously, the higher

capacity battery gets proportionally higher current from

the charger. For Li-Ion batteries, both batteries achieve

the charger float voltage minus the forward regulation

voltage of 15mV. This concept can be extended to more

than two batteries using additional LTC4415. The STAT1,

STAT2 pins provide information as to when the batteries

are being charged. For intelligent control, the EN1/EN2

input pins can be used with a microcontroller as shown

in Figure 9 later in this section.

V

OUT

= V

– V

KEEP_ALIVE gs(M1,2)

where V

is the voltage drop from gate to source

gs(M1,2)

of the composite NMOS device (M1 and M2). The pull-up

resistor, R1, consumes power from the keep-alive source

when the primary or backup sources supply power to the

load.Theprimarypowersourceorbackupbatterysupplies

power to the load when either of them are higher than the

output voltage.

Current limit on any of the diode power paths can be set

to automatically fold back as the output voltage drops (to

reducepowerconsumption),byswitchingoutaresistoron

the CLIM pin, as shown in Figure 6 for diode 1. The gate

of NMOS M3 can optionally be fed from a resistor divided

output voltage to adjust the output voltage threshold of

current foldback.

L1

1.5µH

50k

IDEAL

SW

SENSE

IN1

OUT1

V

PV

LOAD1

BAT

INSENSE

V

+

1.5k

IN

10µF

IN

LTC4415

BAT1

4.5V TO 5.5V

C1

10µF

R1

10k 1k

D1

LED

R2

EN1

CLIM1

CLIM2

STAT1

PGND

WARN1

WARN2

STAT2

LTC4001

CHRG

NTC

EN2

IDEAL

GND

TO µP

FROM µP

FAULT

OUT2

IN2

BATSENS

LOAD2

EN

+

BAT2

PROG IDET

TIMER SS GNDSENS

4415 F07

C2

0.22µF

R5

549Ω

R3

10k

25°C

C3

0.1µF

R4

549Ω

Figure 7. Dual Battery Charging from a Single Charger

4415fa

14

LTC4415

Typical applicaTions

Load Sharing by Multiple Batteries and Automatic

Switchover to a Preferred Power Supply

(Such as a Wall Adapter)

Microcontrolled Power Switch with Reverse Blocking,

Selectable Current Limit, Soft-Start and Monitoring

Figure 9 illustrates an application circuit for microcon-

troller monitoring and control of two power sources. The

microcontroller monitors the input supply voltages and

commands the LTC4415 through EN1/EN2 inputs.

An application circuit for dual battery load sharing with

automatic switchover to a wall adapter (when present)

is shown in Figure 8. In the absence of the wall adapter,

the higher voltage battery provides the load current until

it has discharged to the voltage of the other battery. The

load is then shared between the two batteries according

to their capacities, the higher capacity battery providing

proportionally higher current to the load unless limited

by its current limit.

Currents through the ideal diodes are monitored by the

microcontroller measuring CLIM1/CLIM2 pin voltages

using ADCs. The current limit can be adjusted for either

diode using an external FET as shown in this application

for diode 1 with MN1. The two ideal diode outputs are

connected together for power source ORing, or they may

feed different loads.

When a wall adapter is applied, the output voltage rises

as the body diode of PFET MP1 conducts and both of the

ideal diode paths in the LTC4415 stop conducting due to

reverse turn-off. At this time, the wired-OR status signal

pulls up the gate voltage of NFET MN1, pulling down the

gatevoltageofpowerPFETMP1,turningiton.Thewired-OR

status signal indicates whether the wall adapter or either

of the two batteries is supplying the load current. The two

application circuits described in Figure 7 and Figure 8 can

be cascaded for dual battery charging and load sharing.

Parallel Diodes for Lower Resistance or Higher

Current Output

The two ideal diodes in the LTC4415 can be connected in

parallel as shown in Figure 10 to achieve a low resistance

PowerPath. The master enable input, ENABLE, turns on

diode 2. EN1 is tied to the output so that diode 1 conducts

only afterthe outputhas charged up (bydiode 2according

to its current limit setting). Diode 1 is disabled when the

WALL ADAPTER

MP1 IRFHS9301

IDEAL

IN1

OUT1

+

BAT1

4.7µF

470k 470k

MN1

LTC4415

4.7µH

137k

PV

SW1A

V

PV

IN IN2

V

1.8V

0.6A

IN1

OUT2

EN1

SW2

STAT

IRLML2402

CLIM1

CLIM2

STAT1

10µF

SW1B

WARN1

WARN2

STAT2

V

OUT1

3.3V

0.8A

FB2

V

OUT1

68.1k

4.7µH

1.0M

221k

LTC3521

EN2

IN2

FB1

V

1.2V

0.6A

OUT3

IDEAL

GND

OUT2

SW3

FB3

PGOOD1

PGOOD2

PGOOD3

SHDN1

SHDN2

SHDN3

PWM

ON

OFF

100k

BAT2

PWM

BURST

PGND1A

PGND1B GND PGND2

4415 F08

Figure 8. Dual Battery Load Sharing with Automatic Switchover to a Wall Adapter

4415fa

15

LTC4415

Typical applicaTions

IDEAL

PRIMARY

POWER

SOURCE

IN1

OUT1

LOAD

LTC4415

470k

EN1

CLIM1

CLIM2

STAT1

WARN1

WARN2

STAT2

MICRO-

CONTROLLER

MN1

IRLML2402

EN2

IDEAL

GND

AUXILLIARY

POWER

SOURCE

OUT2

IN2

4.7µF

4415 F09

Figure 9. Microcontrolled PowerPath Monitoring and Control

IDEAL

IN1

OUT1

POWER

SOURCE

LOAD

LTC4415

470k

EN1

CLIM1

CLIM2

STAT1

WARN1

WARN2

STAT2

ENABLE

EN2

IN2

IDEAL

GND

OUT2

4415 F10

D1

1N5817

Figure 10. Parallel Diodes with Current Limit Foldback and Reverse Polarity Protection

output falls below a threshold set by the resistor divider

power(V )isavailable,possiblyfromawalladapter.When

DD

on EN1 pin. This arrangement results in current limit

foldback, reducing the current limit of the parallel diodes

to that of only diode 2 when the output voltage falls, thus

controlling power dissipation.

the input power falls below the supercapacitor voltage,

the supercapcitor provides power to the LTC3521. The

supercapacitorcharger(LTC3625)providesapowerfailure

comparator output signal (PFO) when its input voltage

falls below a preset voltage defined by the resistive divider

on the PFI input. The PFO signal is available to start the

shutdown of high current applications. When the super-

capacitor discharges to a voltage level determined by the

resistor divider on EN1 input of LTC4415, the wired-AND

status signal of LTC4415 pulls up because neither of the

diode paths in LTC4415 are conducting and the coin cell

provides power through a back-to-back connected pair

of NFETs, M1 and M2. The wired-AND status signal is

available to signal that only low current circuits such as

real-timeclockormemoryremainenabledwhileoperating

from the coin cell.

An optional Schottky diode can be inserted in series with

the chip ground as shown in Figure 10 to protect LTC4415

against input power source reverse polarity. The presence

of the Schottky shifts the UVLO and enable pin thresholds

by a voltage equal to the forward voltage drop of the

Schottky diode.

Power Backup Using Supercapacitors and Optional

Keep-Alive Cell

An application of dual backup power is shown on the last

page of this data sheet. Diode 2 provides power to the

triple DC/DC converter (LTC3521) when the primary input

4415fa

16

LTC4415

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

DHC Package

16-Lead Plastic DFN (5mm × 3mm)

(Reference LTC DWG # 05-08-1872 Rev Ø)

Variation A

0.65 ±0.05

1.29 ±0.05

3.50 ±0.05

1.65 ±0.05

2.20 ±0.05 (2 SIDES)

PACKAGE

OUTLINE

0.25 ± 0.05

0.50 BSC

4.40 ±0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

R = 0.115

0.40 ±0.10

5.00 ±0.10

(2 SIDES)

TYP

9

16

R = 0.20

TYP

1.29 REF

3.00 ±0.10

(2 SIDES)

1.65 ±0.10

(2 SIDES)

PIN 1

TOP MARK

(SEE NOTE 6)

PIN 1

NOTCH

(DHC16 Var A) DFN 0410

8

1

0.25 ±0.05

0.50 BSC

0.75 ±0.05

0.200 REF

4.40 ±0.10

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

NOTE:

1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC

PACKAGE OUTLINE MO-229

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

4415fa

17

LTC4415

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

MSE Package

16-Lead Plastic MSOP, Exposed Die Pad

(Reference LTC DWG # 05-08-1667 Rev E)

BOTTOM VIEW OF

EXPOSED PAD OPTION

2.845 ±0.102

(.112 ±.004)

2.845 ±0.102

(.112 ±.004)

0.889 ±0.127

(.035 ±.005)

1

8

0.35

REF

5.23

(.206)

MIN

1.651 ±0.102

(.065 ±.004)

1.651 ±0.102

(.065 ±.004)

3.20 – 3.45

(.126 – .136)

0.12 REF

DETAIL “B”

CORNER TAIL IS PART OF

THE LEADFRAME FEATURE.

FOR REFERENCE ONLY

DETAIL “B”

16

9

0.305 ±0.038

0.50

(.0197)

BSC

NO MEASUREMENT PURPOSE

4.039 ±0.102

(.159 ±.004)

(NOTE 3)

(.0120 ±.0015)

TYP

0.280 ±0.076

(.011 ±.003)

RECOMMENDED SOLDER PAD LAYOUT

16151413121110

9

REF

DETAIL “A”

0.254

(.010)

3.00 ±0.102

(.118 ±.004)

(NOTE 4)

0° – 6° TYP

4.90 ±0.152

(.193 ±.006)

GAUGE PLANE

0.53 ±0.152

(.021 ±.006)

1 2 3 4 5 6 7 8

DETAIL “A”

0.86

(.034)

REF

1.10

(.043)

MAX

0.18

(.007)

SEATING

PLANE

0.17 – 0.27

(.007 – .011)

TYP

0.1016 ±0.0508

(.004 ±.002)

MSOP (MSE16) 0911 REV E

0.50

(.0197)

BSC

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL

NOT EXCEED 0.254mm (.010") PER SIDE.

4415fa

18

LTC4415

revision hisTory

REV

DATE

DESCRIPTION

PAGE NUMBER

A

4/12

Clarified footnotes and added new Note 5 for quiescent current

Changed FET MP1 part number on Figure 8

3, 4

15

4415fa

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.

19

LTC4415

Typical applicaTion

Power Backup Using Supercapacitors and Optional Keep-Alive Cell

KEEP-ALIVE/COIN CELL

M1

DMN2215UDM

M2

IDEAL

IN1

OUT1

V

OUT

DD

IN

L1 3.3µH

L2 3.3µH

47µF

C

300k

200k

TOP

360F

LTC4415

4.7µH

137k

294k

100k

EN

SW1

PV

SW1A

V

PV

IN IN2

V

1.8V

0.6A

IN1

OUT2

LTC3625

EN1

SW2

PFI

CTL

SW2

STAT1

10µF

C

BOT

360F

SW1B

V

MID

WARN1

WARN2

STAT2

V

OUT1

3.3V 1A

47k

FB2

V

SEL

GND

V

OUT1

68.1k

4.7µH

PFO

CLIM1

CLIM2

22µF

1.0M

LTC3521

PROG

R

125Ω

FB1

V

1.2V

0.6A

OUT3

PROG

78.7k

125Ω

SW3

FB3

PGOOD1

PGOOD2

PGOOD3

SHDN1

SHDN2

SHDN3

PWM

221k

ON

IDEAL

GND

OFF

100k

OUT2

IN2

PWM

EN2

BURST

PGND1A

PGND1B GND PGND2

4415 TA02

relaTeD parTs

PART NUMBER DESCRIPTION

COMMENTS

LTC4411

LTC4412

2.6A Low Loss Ideal Diode

PowerPath Controller

Monolithic Low Loss PowerPath, ThinSOT Package

3V to 28V Input Voltage Range, ThinSOT Package

LTC4413-1/

LTC4413-2

140mΩ On-Resistance, Overvoltage Protection Sensor with Drive Output

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

LTC4414

LTC4416

LTC4352

LTC4354

LTC4355

LTC4357

LTC4358

LTC4066

36V, Low Loss PowerPath Controller for Large PFETs

36V, Low Loss Dual PowerPath Controllers

Low Voltage Ideal Diode Controller With Monitoring

Negative High Voltage Diode-OR Controller and Monitor

Positive High Voltage Diode-OR Controller and Monitor

Positive High Voltage Ideal Diode Controller

5A Monolithic Ideal Diode

Drives Large Q PFETs, 3.5V to 36V

G

Designed to Drive Large and Small Q PFETs, 3.5V to 36V

G

Controls Single N-Channel MOSFET, Input Supply Monitors, 2.9V to 18V

Controls Two N-Channel MOSFETs, 4.5V to 80V

Controls Two N-Channel MOSFETs, 9V to 80V

Controls Single N-Channel MOSFET, 9V to 80V

20mΩ N-Channel MOSFET, 9V to 26.5V

USB Power Controller and Li-Ion Linear Charger with Low

Loss Ideal Diode

Seamless Transition Between Input Power Sources: Li-Ion Battery,

USB and 5V Wall Adapter

LTC4425

LTC2952

Linear Supercapacitor Charger with Current-Limited Ideal

Diode and V/I Monitor

50mΩ On-Resistance, 2.7V to 5.5V, Programmable Current Limit,

Programmable Output Voltage Mode

Pushbutton Ideal Diode PowerPath Controller with

Supervisor

Controls Two P-Channel MOSFETs, 2.7V to 28V

4415fa

LT 0412 REV A • PRINTED IN USA

20 ^{LinearTechnology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

 LINEAR TECHNOLOGY CORPORATION 2011

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


型号：	LTC4413-2
厂家：	Linear
描述：	Dual 4A Ideal Diodes with Adjustable Current Limit 双通道4A理想二极管具有可调电流限制二极管
文件：	总20页 (文件大小：346K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC4413-2 [Linear]

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