LTC1558 [Linear]

Dual 2.6A, 2.5V to 5.5V, Ideal Diodes in 3mm 3mm DFN; 双2.6A ， 2.5V至5.5V ，理想二极管采用3mm 3mm DFN封装


型号：	LTC1558
厂家：	Linear
描述：	Dual 2.6A, 2.5V to 5.5V, Ideal Diodes in 3mm 3mm DFN 双2.6A ， 2.5V至5.5V ，理想二极管采用3mm 3mm DFN封装二极管
文件：	总12页 (文件大小：154K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC4413

Dual 2.6A, 2.5V to 5.5V,

Ideal Diodes in 3mm × 3mm DFN

FEATURES

DESCRIPTIO

The LTC^®4413 contains two monolithic ideal diodes, each

capable of supplying up to 2.6A from input voltages be-

tween 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

exceedsitsrespectiveinputvoltages,thatMOSFETisturned

off and less than 1µA of reverse current will flow from OUT

to IN. Maximum forward current in each MOSFET is lim-

ited to a constant 2.6A and internal thermal limiting cir-

cuits protect the part during fault conditions.

■

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

2.6A Maximum Forward Current

■

Internal Current Limit and Thermal Protection

Slow Turn-Off to Protect Against Inductive Source

Impedance-Induced Voltage Spiking

Low Quiescent Current

Status Output to Indicate if Selected Channel is

Conducting

Programmable Channel ON/OFF

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

Package

■

Two active-high control pins independently turn off the

two ideal diodes contained within the LTC4413, control-

lingtheoperationmodeasdescribedbyTable3. Whenthe

selected channel is reverse biased, or the LTC4413 is put

into low power standby, a status signal indicates this con-

dition with a low voltage.

■

APPLICATIO S

■

Battery and Wall Adapter Diode ORing in Handheld

Products

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

status.Whenterminatedtoapositivesupplythrougha470k

resistor, the STAT pin can be used to indicate that the se-

lecteddiodeisconductingwithaHIGHvoltage. Thissignal

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

powerswitchtocontrolathirdalternatepowersourcewhen

the LTC4413 is not conducting forward current.

■

Backup Battery Diode ORing

■

Power Switching

USB Peripherals

Uninterruptable Supplies

■

, LTC and LT 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.

TYPICAL APPLICATIO

LTC4413 vs 1N5817 Schottky

2000

ENBA

470k

1500

GND LTC4413

ENBB

STAT IS HIGH WHEN

BAT IS SUPPLYING

STAT

OUTB

LTC4413

LOAD CURRENT

WALL

ADAPTER

(0V TO 5.5V)

INB

1000

10µF

1N5817

CONTROL CIRCUIT

500

INA

OUTA

TO LOAD

BAT

4.7µF

200

(mV)

300

400

100

4413 TA01

4413 TA01b

FWD

4413f

LTC4413

W W

U W

W U

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

(Note 1)

ORDER PART

NUMBER

INA, INB, OUTA, OUTB, STAT,

TOP VIEW

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

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

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

Continuous Power Dissipation

INA

ENBA

GND

ENBB

INB

10 OUTA

STAT

LTC4413EDD

OUTB

DD PART

MARKING

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

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

LBGN

T_JMAX= 125°C, θ_JA= 40°C/W (4-LAYER PCB)

EXPOSED PAD (PIN 11) IS GND

MUST BE SOLDERED TO PCB

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

ELECTRICAL CHARACTERISTICS

The ● indicates 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

V , V

Operating Supply Range for Channel A or B

●

2.5

5.5

IN OUT

for Proper Operation

UVLO

UVLO Turn-On Rising Threshold

Max (V , V , V

, V

)

●

2.4

INA INB OUTA OUTB

UVLO Turn-Off Falling Threshold

Max (V , V , V

, V

1.7

–1

INA INB OUTA OUTB

Quiescent Current in Forward Regulation (Note 3)

= 3.6V, I

= 0mA

= –100mA, V = 0V,

0.5

µA

INA

OUTA

INB

OUTB

Current Drawn from or Sourced into IN when

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

OUT

●

µA

LEAK

is Greater than V

OUT

Quiescent Current While in Reverse Turn-Off,

Measured via GND

, V , V

< V

= 5.5V,

= 5.5V

QRGND

QROUTA

INA INB OUTB

OUTA

= 0V

STAT

Quiescent Current While in Reverse Turn-Off,

, V , V

INA INB OUTB

●

Current Drawn from V

Supplies Chip Power

when OUTA

OUTA

Quiescent Current While in Reverse Turn-Off,

, V , V

INA INB OUTA

< V

= 5.5V

and

µA

QROUTB

QOFF

OUTB

Current Drawn from V

Supplies Chip Power

when OUTB

OUTA

Quiescent Current with Both ENBA

and ENBB High

= V = 3.6V, V

INA

INB

ENBA

= 0V

High, V

ENBB

STAT

Reverse Turn-Off Voltage (V

– V )

= 3.6V

–5

RTO

FWD

OUT

Forward Voltage Drop (V – V

)

OUT

= 3.6V

●

at I

= –1mA

OUT

On Resistance, R

(Measured as ∆V/∆I)

Regulation

= 3.6V, I

= –100mA

= –500mA (Note 5)

140

100

mΩ

FWD

OUT

On Resistance, R Regulation

= 3.6V, I

= –1.5A (Note 5)

= –100mA

140

200

mΩ

OUT

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

PowerPath^TMTurn-Off Time

= 3.6V, I

µs

OFF

OUT

PowerPath is a trademark of Linear Technology Corporation.

4413f

LTC4413

ELECTRICAL CHARACTERISTICS

The ● indicates specifications which apply over the full operating

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

SYMBOL PARAMETER

Short-Circuit Response

CONDITIONS

MIN

TYP

MAX

UNITS

Current Limit

= 3.6V (Notes 4, 5)

1.8

INX

Quiescent Current While in

Overcurrent Operation

= 3.6V, I

= 1.9A (Notes 4, 5)

OUT

150

300

µA

QOC

STAT Output

STAT Off Current

Shutdown

●

–1

µA

µs

SOFF

SON

STAT Sink Current

> V , V < V , I

< I

MAX

OUT CTL

IL OUT

STAT Pin Turn-On Time

STAT Pin Turn-Off Time

S(ON)

S(OFF)

ENB Inputs

ENB Inputs Rising Threshold Voltage

ENB Inputs Falling Threshold Voltage

ENB Inputs Hysteresis

Rising

●

540

460

600

4.5

µA

ENBIH

ENBIL

ENB

Falling

= (V

400

1.5

– V )

ENBIL

ENBHYST

ENB

ENBHYST

ENBIH

ENB Inputs Pull-Down Current

< V = 3.6V, V

> V

ENBIL

●

OUT

ENB

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LTC4413 is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the –40°C to 85°C ambient

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: This specification is guaranteed by correlation to wafer-level

measurements.

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

vs I

OUT

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

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

4413f

LTC4413

TYPICAL PERFOR A CE CHARACTERISTICS

U W

I_QFvs I_LOAD

I_QFvs Temperature

200

160

120

200

160

120

120°C

80°C

40°C

0°C

120°C

80°C

40°C

0°C

AT 1A

–40°C

AT 100mA

1.50

(A)

2.50

100E-6 1E-3

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

(A)

0.50

TEMPERATURE (°C)

–40

120

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

2.20

2.15

2.10

120

100

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

–40

120

–40

2.5

3.5

4.5

5.5

TEMPERATURE (°C)

(V)

TEMPERATURE (°C)

INA

4413 G04

4413 G05

4413 G06

V_FWDand R_FWDvs I_LOAD

R_FWDvs Temperature (V_IN= 3.5V)

V_FWDand R_FWDvs I_LOAD

300

250

200

150

100

300

250

200

150

100

160

140

120

100

120°C

80°C

40°C

0°C

FWD

80°C

40°C

0°C

RFWD I

= 100mA

OUT

–40°C

RFWD I

= 1A

OUT

FWD

RFWD I

= 500mA

FWD

OUT

10000

–20

TEMPERATURE (°C)

100

500 1000 1500 2000 2500 3000

(mA)

100

(mA)

1000

–60

140

LOAD

OUT

4413 G09

4413 G08

4413 G07

4413f

LTC4413

U W

TYPICAL PERFOR A CE CHARACTERISTICS

V_FWDvs I_LOAD(V_IN= 3.5V)

ENB Turn-On

ENB Turn-Off

300

250

200

150

100

120°C

80°C

40°C

0°C

CH4

–40°C

CH2

CH1

CH4

CH3

CH2

CH3

CH2

CH1

4413 G12

4413 G11

20µs/DIV

(200mA/DIV)

400µs/DIV

(500mA/DIV)

CH4 = I

OUT

CH3 = V

CH2 = V

CH1 = V

(2V/DIV)

CH3 = V

CH2 = V

CH1 = V

(2V/DIV)

OUT

100

1000

10000

(2V/DIV)

STAT

ENBA

STAT

ENBA

(500mV/DIV)

(mA)

(500mV/DIV)

LOAD

4413 G10

ENB Threshold vs Temperature

ENB Hysteresis vs Temperature

120

100

550

500

450

400

350

300

–40

120

–40

120

TEMPERATURE (°C)

4413 G14

4413 G13

–I_LEAKvs Temperature at

V_REVERSE= 5.5V

–I_LEAKvs V_REVERSE

10E-6

1E-6

10E-6

1E-6

80°C

40°C

0°C

–40°C

100E-9

10E-9

100E-9

10E-9

1E-9

–40

120

TEMPERATURE (°C)

(V)

REVERSE

4413 G15

4413 G16

4413f

LTC4413

PI FU CTIO S

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. This pin can be

grounded when not used.

OUTB(Pin6):SecondaryIdealDiodeCathodeandOutput.

BypassOUTBwithahigh(1mΩ min)ESRceramiccapaci-

tor of at least 4.7µF. This pin must be left floating when not

in use.

NC (Pin 7): No Internal Connection.

NC (Pin 8): No Internal Connection.

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.

STAT(Pin9):StatusConditionIndicator.Weak(9µA)pull-

down current output. When terminated, STAT = High

indicates diode conducting.

ThefunctionoftheSTATpindependsonthemodethathas

been selected. Table 2 describes the STAT pin output

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

conductionstateofthetwodiodes.Thispincanalsobeleft

floating or grounded.

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.

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

BypassOUTAwithahigh(1mΩ min)ESRceramiccapaci-

tor of at least 4.7µF. This pin must be left floating when not

in use.

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.

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

higher valued capacitances are recommended when large

inductances are in series with this input. This pin can be

grounded when not used.

4413f

LTC4413

BLOCK DIAGRA

INA

OUTA

OVER CURRENT

–

UVLO

ENA

–

AENA

OVERTEMP

ENB

BENA

STAT

OUTA (MAX)

OUTB (MAX)

STB

GATEA

–

OFF

O.5V

9µA

ENA

AENA

ENBA

–

3µA

GND

INB

OUTB

OVER CURRENT

–

GATEB

–

OFF

O.5V

ENB

BENA

ENBB

–

3µA

4413 F01

Figure 1

4413f

LTC4413

OPERATIO

The LTC4413 is described with the aid of the Block

Diagram (Figure 1). Operation begins when the power

source at V_INAor V_INBrises above the undervoltage

lockout (UVLO) voltage of 2.4V and either of the ENBA or

ENBB control pins is low. If only the voltage at the V_INApin

is present, the power source to the LTC4413 (V_DD) will be

supplied from the V_INApin. The amplifier (A) will pull a

current proportional to the difference between V_INAand

V_OUTAfrom the gate (V_GATEA) of the internal PFET (PA),

driving this gate voltage below V_INA. This will turn on PA.

As V_OUTAis pulled up to a forward voltage drop (V_FWD) of

20mV below V_INA, the LTC4413 will regulate V_GATEAto

maintain the small forward voltage drop. The system is

now in forward regulation and the load at V_OUTAwill be

powered from the supply at V_INA. As the load current

varies, V_GATEAwill be controlled to maintain V_FWDuntil the

load current exceeds the transistor’s (PA) ability to deliver

the current as V_GATEAapproaches GND. At this point the

PFET will behave as a fixed resistor with resistance R_ON,

whereby the forward voltage will increase slightly with

increasedloadcurrent.AsthemagnitudeofI_OUTincreases

further(suchthatI_LOAD>I_OC),theLTC4413willfixtheload

current to the constant value I_OCto protect the device. The

characteristics for parameters R_FWD, R_ON, V_FWDand I_OC

are specified with the aid of Figure 2, illustrating the

LTC4413 forward voltage drop versus that of a Schottky

diode.

If another supply is provided at V_INB, the LTC4413 will

likewise regulate the gate voltage on PB to maintain the

output voltage V_OUTBjust below the input voltage V_INB. If

thisalternatesupply, V_INB, exceedsthevoltageatV_INA, the

LTC4413 will select this input voltage as the internal

supply (V_DD). This second ideal diode operates indepen-

dently of the first ideal diode function.

When an alternate power source is connected to the load

at V_OUTA(or V_OUTB), the LTC4413 will sense the increased

voltage at V_OUTAand amplifier A will increase the voltage

_GATEA, reducing the current through PA. When V_OUTAis

higher than V_INA+ V_RTO, V_GATEAwill be pulled up to V_DD,

which will turn off PA. The internal power source for the

LTC4413 (V_DD) will then be diverted to source current

from the V_OUTApin, only if V_OUTAis larger than V_INB(or

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

Power to the load is being delivered from an alternate

supply and only a small current is drawn from V_INAto

sense the potential at V_INA

When the selected channel of the LTC4413 is in reverse

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

will sink 9µA of current (I_SON) if connected.

Channel selection is accomplished using the two ENB

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

(high), PA will have its gate voltage pulled to V_DDat a

controlled rate, limiting the turn-off time to avoid voltage

spiking at the input when being driven by an inductive

source impedance. A 3µA pull-down current on the ENB

pins will ensure a low level at these inputs if left floating.

SLOPE

1/R

FWD

Overcurrent and Short-Circuit Protection

LTC4413

During an overcurrent condition, the output voltage will

droop as the load current exceeds the amount of current

that the LTC4413 can supply. At the time when an over-

current condition is first detected, the LTC4413 will take

some time to detect this condition before reducing the

current to I_MAX. For short durations after the output is

shorted, the current may exceed I_MAX. The magnitude of

this peak short-circuit current can be large, depending on

the load current immediately before the short circuit

SCHOTTKY

DIODE

SLOPE

1/R

FWD

FORWARD VOLTAGE (V)

4413 F02

Figure 2

4413f

LTC4413

OPERATIO

occurs.Duringovercurrentoperation,thepowerconsump-

tion of the LTC4413 will be large, and is likely to cause an

overtemperatureconditionastheinternaldietemperature

exceeds the thermal shutdown temperature.

ThefunctionoftheSTATpindependsonthemodethathas

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.

Table 2. STAT Output Pin Funtion

Overtemperature Protection

ENB1

ENB2

CONDITIONS

STAT

The overtemperature condition is detected when the inter-

nal die temperature increases beyond 150°C. An overtem-

perature condition will cause 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 will turn on and revert to normal

operation. Note that prolonged operation under overtem-

perature conditions will degrade reliability.

Low

Diode A Forward Bias,

Diode B Forward Bias

= 0µA

= 9µA

= 0µA

= 9µA

= 0µA

= 9µA

SNK

Diode A Forward Bias,

Diode B Reverse Bias

Diode A Reverse Bias,

Diode B Forward Bias

Diode A Reverse Bias,

Diode B Reverse Bias

Low

High

Low

High

Diode A Forward Bias,

Diode B Disabled

Channel Selection and Status Output

Diode A Reverse Bias,

Diode B Disabled

Two active-high control pins independently turn off the

two ideal diodes contained within the LTC4413, control-

lingtheoperationmodeasdescribedbyTable1. Whenthe

selected channel is reverse biased, or the LTC4413 is put

into low power standby, the status signal indicates this

condition with a low voltage.

Diode A Disabled,

Diode B Forward Bias

Diode A Disabled

Diode B Reverse Bias

Diode A Disabled,

Diode B Disabled

Table 1. Mode Control

ENB1

ENB2

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 0ff (Low Power Standby)

W U U

APPLICATIO S I FOR ATIO

Introduction

Dual Battery Load Sharing with Automatic Switchover

to a Wall Adapter

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

more batteries, charging of multiple batteries from a

single charger and high side power switching.

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 will provide

theloadcurrentuntilithasdischargedtothevoltageofthe

otherbattery.Theloadwillthenbesharedbetweenthetwo

batteries according to the capacity of each battery. The

higher capacity battery will provide proportionally higher

4413f

LTC4413

W U U

APPLICATIO S I FOR ATIO

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

10µF

1000k

ENBA

ENBB

GND

200k

STAT

3,11

Automatic Switchover from a Battery to an Auxiliary

Supply or a Wall Adapter

STAT

LTC4413

IDEAL

OUTA 10

470k

INA

INB

LOAD

BATA

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

rising turn-off threshold of 550mV through resistive di-

vider (R4 and R5). 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 cur-

rent), as the wall adapter voltage rises, the body diode in

MP1willforwardbias,pullingtheoutputvoltageabovethe

BAT voltage. The LTC4413 will sense a reverse voltage of

as little as 10mV and turn off the ideal diode between INA

and OUTA. This will cause the STAT voltage to fall, turning

on MP1. The load will then draw current from the wall

adapter, and the battery will be disconnected from the

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

removed, the load voltage will droop until the BAT voltage

exceeds the load voltage. The LTC4413 will sense that the

BAT voltage is greater, causing the STAT voltage to rise,

disablingMP1;theBATwillthenprovidepowertotheload.

1-CELL Li-Ion

IDEAL

OUTB

BATB

4.7µF

1-CELL Li-Ion

C1:C1206C106K8PAC

C2:C1206C475K8PAC

4413 F03

Figure 3

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

the voltage divider formed by R1 and R2 will disable the

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

MP1. At this point the load will be powered by the wall

adapter and both batteries may be removed without inter-

rupting the load voltage. When the wall adapter is re-

moved, the output voltage will droop until the voltage

divider turns on the LTC4413, at which point the batteries

will 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 microcontrol-

ler monitoring and control of two power sources. The

MP1 FDR8508

WALL

ADAPTER

STAT

10µF

470k

1000k

1Ω

MICROCONTROLLER

ENBB

LTC4413

IDEAL

OUTA 10

STAT

100k

STAT

470k

ENBA

INA

ENBB

STAT

3,11

BAT

GND

3,11

GND

LTC4413

IDEAL

OUTA 10

IDEAL

OUTB

INB

AUX

ADAPTER

INA

PRIMARY

POWER

LOAD

4.7µF

IDEAL

OUTB

10µF

1000k

INB

ENBA

AUX

POWER

4413 F05

500k

10µF

4.7µF

C1:C0805C106K8PAC

C2:C1206C475K8PAC

4413 F04

Figure 5

Figure 4

4413f

LTC4413

W U U

APPLICATIO S I FOR ATIO

current until both battery voltages are equal, then both will

be charged. While both batteries are charging simulta-

neously, the higher capacity battery will get proportionally

higher current from the charger. For Li-Ion batteries, both

batteries will achieve the float voltage minus the forward

regulation voltage of 20mV. This concept can apply to

more than two batteries. The STAT pin provides informa-

tion 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

resistivedividertoENBBrisesthroughtheturn-offthresh-

old,theSTATpinwillfallandMP1willconductallowingthe

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

removed while the AUX supply is present, the load voltage

willfalluntilthevoltagedividerattheENBBpinfallsthrough

its turn-on threshold. Once this occurs, the LTC4413 will

automaticallyconnecttheAUXsupplytotheloadwhenthe

AUXvoltageexceedstheoutputvoltage, causingtheSTAT

voltage to rise and disabling the external PFET.

When an AUX supply is attached, the voltage divider at

ENBA will disconnect the battery from the load, and the

auxiliary supply will provide 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 will be high, thereby disabling

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

than the battery is connected to INB, the load voltage will

rise as the second ideal diode conducts. As soon as the

OUTAvoltageexceedsINAvoltage, theBATwillbediscon-

nected from the load and the STAT voltage will fall, turning

on the LTC4059 battery charger and beginning a charge

cycle. If the wall adapter is removed, the voltage at INB will

collapse until it is below the load voltage. When this oc-

curs, theLTC4413willautomaticallyreconnectthebattery

to the load and the STAT voltage will rise, disabling the

LTC4059 battery charger. One major benefit of this circuit

isthatwhenawalladapterispresent,theusermayremove

the battery and replace it without disrupting the load.

Multiple Battery Charging

Figure6illustratesanapplicationcircuitforautomaticdual

battery charging from a single charger. Whichever battery

has the lower voltage will receive the larger charging

STAT IS HIGH

WHEN BAT1

470k

LTC4413

STAT

IS CHARGING

IDEAL

BATTERY

CHARGER

INPUT

INA

OUTA 10

LOAD1

LOAD2

BAT1

BAT2

IDEAL

INB

OUTB

ENBA

ENBB

GND

3,11

4413 F06

Figure 6

LTC4413

STAT

560k

LTC4059

IDEAL

INA

OUTA 10

BAT

ENB

PROG

ENBA

ENBB

GND

1-CELL

Li-Ion

100k

3,11

Li CC GND

IDEAL

INB OUTB

WALL

ADAPTER

TO LOAD

C1: C0805C106K8PAC

C2: C1206C475K8PAC

10µF

4.7µF

4413 F07

Figure 7

4413f

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 represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

LTC4413

PACKAGE DESCRIPTIO

DD Package

10-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1699)

R = 0.115

TYP

0.38 ± 0.10

0.675 ±0.05

3.50 ±0.05

2.15 ±0.05 (2 SIDES)

1.65 ±0.05

3.00 ±0.10

(4 SIDES)

1.65 ± 0.10

(2 SIDES)

PIN 1

TOP MARK

(SEE NOTE 5)

PACKAGE

OUTLINE

(DD10) DFN 0403

0.25 ± 0.05

0.50 BSC

0.75 ±0.05

0.200 REF

0.25 ± 0.05

0.50

BSC

2.38 ±0.10

(2 SIDES)

2.38 ±0.05

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

NOTE:

4. EXPOSED PAD SHALL BE SOLDER PLATED

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

TOP AND BOTTOM OF PACKAGE

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. ALL DIMENSIONS ARE IN MILLIMETERS

3. 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

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

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Backup Battery Controller with Programmable

Output

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

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2.5µA, 1% Accurate Programmable Battery

Detector

Adjustable Trip Voltage/Hysteresis, ThinSOT^TM

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

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LTC4411

MOSFET Diode-OR Controller

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No External MOSFET, Automatic Switching Between DC Sources, Simplified

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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)

ThinSOT is a trademark of Linear Technology Corporation.

4413f

LT/TP 1104 1K • PRINTED IN THE USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

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

LTC1558 [Linear]

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