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LTC4413-1/LTC4413-2

441312fd

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Dual 2.6A, 2.5V to 5.5V

Fast Ideal Diodes

in 3mm × 3mm DFN

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

diodes use a 100mΩ P-channel MOSFET to independently

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 ﬂ ows 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

fault conditions. An internal overvoltage protection sensor

detects when a voltage exceeds the LTC4413-2 absolute

maximum voltage tolerance.

Two active-high control pins independently turn off the two

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.

The LTC4413-1/LTC4413-2 are housed in a 10-lead 3mm

× 3mm DFN package.

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

Technology Corporation. PowerPath is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

2-Channel Ideal Diode OR’ing or Load Sharing

Low Loss Replacement for PowerPath™ OR’ing

Diodes

Fast Response Replacement for LTC4413

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

Low Reverse Leakage Current

Low Regulated Forward Voltage (18mV Typ)

Overvoltage Protection Sensor with Drive Output for

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

2.5V to 5.5V Operating Range

2.6A Maximum Forward Current

Internal Current Limit Protection

Internal Thermal Protection

Status Output to Indicate if Selected Channel is

Conducting

Programmable Channel On/Off

Low Proﬁ le (0.75mm) 10-Lead 3mm

3mm DFN

Package

Battery and Wall Adapter Diode OR’ing in Handheld

Products

Backup Battery Diode OR’ing

Power Switching

USB Peripherals

Uninterruptable Supplies

INA

IDEAL

FDR8508

LTC4413-2

INB

IDEAL

BAT

ENBA

GND

ENBB

OUTA

OUTB

STAT

470k

4.7μF

441312 TA01a

STAT

STAT IS HIGH WHEN WALL ADAPTER IS

SUPPLYING LOAD CURRENT

OVP IS HIGH WHEN WALL ADAPTER VOLTAGE > 6V

OVP

TO LOAD

OVI

OVP

10μF

0.1μF

WALL

ADAPTER

INPUT

1Ω

Automatic Switchover from a Battery to a Wall Adapter

LOAD (mA)

700

600

500

400

300

200

100

1500 2500

441312 TA01b

500 1000

2000 3000

POWER LOSS (mW)

1N5817

LTC4413-1

Power Loss vs Load

Summary of content (16 pages)

PAGE 1
LTC4413-1/LTC4413-2 Dual 2.6A, 2.5V to 5.5V Fast Ideal Diodes in 3mm × 3mm DFN DESCRIPTION FEATURES n n n n n n n n n n n n n n 2-Channel Ideal Diode OR’ing or Load Sharing Low Loss Replacement for PowerPath™ OR’ing Diodes Fast Response Replacement for LTC4413 Low Forward On-Resistance (140mΩ Max at 3.6V) Low Reverse Leakage Current Low Regulated Forward Voltage (18mV Typ) Overvoltage Protection Sensor with Drive Output for an External P-Channel MOSFET (LTC4413-2 Only) 2.5V to 5.5V Operating Range 2.
PAGE 2
LTC4413-1/LTC4413-2 ABSOLUTE MAXIMUM RATINGS (Note 1) INA, INB, OUTA, OUTB, STAT, ENBA, ENBB Voltage .................................... –0.3V to 6V OVI, OVP Voltage ....................................... –0.3V to 13V Operating Temperature Range .................–40°C to 85°C Storage Temperature Range .................. –65°C to 125°C Continuous Power Dissipation ..........................
PAGE 3
LTC4413-1/LTC4413-2 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. (Notes 2, 6) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 3.5 6.5 μA 28 38 μA 10 mV 18 24 mV IQROUTB Quiescent Current While in Reverse Turn-Off. Current Drawn from VOUTA When OUTB Supplies Chip Power VINA = VINB = 0V, VOUTA = 3.6V, VOUTB = 5.
PAGE 4
LTC4413-1/LTC4413-2 TYPICAL PERFORMANCE CHARACTERISTICS IQF vs ILOAD (Log) IQF vs ILOAD (Linear) 120 IQF vs Temperature 120 120 120°C 120°C 100 80°C 40°C 40°C 0°C –40°C 60 80 –40°C 60 500mA 60 40 40 40 20 20 20 0 1 10 100 LOAD (mA) 1000 0 10000 0 2500 1000 1500 2000 LOAD (mA) 500 441312 G01 2.20 3000 2.
PAGE 5
LTC4413-1/LTC4413-2 TYPICAL PERFORMANCE CHARACTERISTICS VFWD and RFWD vs ILOAD (Linear) 500 120°C 80°C 40°C 0°C –40°C 78 76 400 RFWD (mΩ) 68 500 200 VFWD 400 300 150 200 100 66 RFWD 64 100 50 300 120°C 80°C 40°C 0°C –40°C RFWD 250 200 VFWD 300 150 200 100 100 50 VFWD (mV) 70 600 VFWD (mV) RFWD 500mA (mΩ) 74 72 RFWD and VFWD vs ILOAD (Log) 250 RFWD (mΩ) RFWD vs VIN and ILOAD = 500mA 80 62 0 60 2.5 3 3.5 4 4.5 VIN (V) 5 5.
PAGE 6
LTC4413-1/LTC4413-2 TYPICAL PERFORMANCE CHARACTERISTICS ENB Turn-Off, 2μs to Disconnect IN from 180mA Load Efﬁciency vs Load Current Power Loss vs Load Current 100 1000 120°C 80°C 40°C 0°C –40°C 99 CH1 IN 1V/DIV 98 CH3 ENB 1V/DIV CH4 IIN 100mV/DIV 100 97 96 95 94 93 120°C 80°C 40°C 0°C –40°C 92 441312 G19 4μs/DIV POWER LOSS (mW) EFFICIENCY (%) CH2 OUT 1V/DIV 91 90 1 10 10 1 0 100 LOAD (mA) 1000 10000 10 1 100 LOAD (mA) 1000 441312 G20 441312 G21 Overvoltage Hysteresis vs Tempe
PAGE 7
LTC4413-1/LTC4413-2 PIN FUNCTIONS INA (Pin 1): Primary Ideal Diode Anode and Positive Power Supply for LTC4413-1/LTC4413-2. Bypass INA with a ceramic 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. ENBA (Pin 2): Enable Low for Diode A. Pull this pin high to shut down this power path. Tie to GND to enable.
PAGE 8
LTC4413-1/LTC4413-2 BLOCK DIAGRAM OUTA INA OVER CURRENT 0.5V 2 ENBA – + + – 1 –+ VOFF PA – + VGATEA AENA ENA A UVLO ENA ENB OUTA (MAX) OUTB (MAX) AENA OVER TEMP BENA OVER TEMP STAT STB GND OUTB INB OVER CURRENT 0.
PAGE 9
LTC4413-1/LTC4413-2 OPERATION The LTC4413-1/LTC4413-2 are described with the aid of the Block Diagram. Operation begins when the power source at VINA or VINB rises above the undervoltage lockout (UVLO) voltage of 2.4V and the corresponding control pin ENBA or ENBB is low. If only the voltage at the VINA pin is present, the internal power source (VDD) is supplied from the VINA pin.
PAGE 10
LTC4413-1/LTC4413-2 OPERATION Overcurrent and Short-Circuit Protection During an overcurrent condition, the output voltage droops 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 reducing the current to IOC. For short durations after the output is shorted, until TOC, the current may exceed IOC.
PAGE 11
LTC4413-1/LTC4413-2 APPLICATIONS INFORMATION Introduction The LTC4413-1/LTC4413-2 are intended for power control applications that include low loss diode OR’ing, fully automatic 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 batteries from a single charger and high side power switching.
PAGE 12
LTC4413-1/LTC4413-2 APPLICATIONS INFORMATION Automatic Switchover from a Battery to an Auxiliary Supply, or a Wall Adapter with Overvoltage Protection 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.
PAGE 13
LTC4413-1/LTC4413-2 APPLICATIONS INFORMATION Automatic Switchover from a Battery to a Wall Adapter and Charger with Overvoltage Protection Figure 6 illustrates the LTC4413-2 performing the function of automatically switching a load over from a battery to a wall adapter while controlling an LTC4059 battery charger. 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.
PAGE 14
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 PFET to linger in a high RDS(ON) region where it can dissipate a signiﬁcant amount of heat depending on the load current.
PAGE 15
LTC4413-1/LTC4413-2 PACKAGE DESCRIPTION DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699 Rev B) 0.70 p0.05 3.55 p0.05 1.65 p0.05 2.15 p0.05 (2 SIDES) PACKAGE OUTLINE 0.25 p 0.05 0.50 BSC 2.38 p0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 p0.10 (4 SIDES) R = 0.125 TYP 6 0.40 p 0.10 10 1.65 p 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) (DD) DFN REV B 0309 5 0.200 REF 1 0.25 p 0.05 0.50 BSC 0.75 p0.05 0.00 – 0.05 2.38 p0.
PAGE 16
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 C1 10μF C2 10nF D1 OPTIONAL OUTA IDEAL VCC RSTAT 470k RENBA 560k 0.1μF D2 5.6V 1Ω ENBA STAT LTC4413-2 OVI GND STAT OVP OUTB OVP ENBB INB BAT + COUT 4.