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LTC4413

4413fc

TYPICAL APPLICATION

DESCRIPTION

Dual 2.6A, 2.5V to 5.5V,

Ideal Diodes in 3mm

3mm DFN

The LTC

4413 contains two monolithic ideal diodes,

each capable of supplying up to 2.6A from input voltages

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

P-channel MOSFET that independently connects INA to

OUTA and INB to OUTB. During normal forward operation

the voltage drop across each of these diodes is regulated

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

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

exceeds its respective input voltages, that MOSFET is

turned off and less than 1μA of reverse current will ﬂ ow

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.

Two active-high control pins independently turn off the

two ideal diodes contained within the LTC4413, control-

ling the operation mode as described by Table 1. When

the selected channel is reverse biased, or the LTC4413 is

put into low power standby, a status signal indicates this

condition with a low voltage.

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

status. When terminated to a positive supply through a

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

selected diode is conducting with a high voltage. This signal

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

power switch to control a third alternate power source

when the LTC4413 is not conducting forward current.

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

LTC4413 vs 1N5817 Schottky

FEATURES

APPLICATIONS

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-On/Off to Protect Against Inductive

Source Impedance-Induced Voltage Spiking

Ultralow Quiescent Current Consumption, Low

Power Alternative to the LTC4413-1

Status Output to Indicate if Selected Channel is

Conducting

Programmable Channel On/Off

Low Proﬁ le (0.75mm) 10-Lead 3mm × 3mm DFN

Package

Battery and Wall Adapter Diode ORing in Handheld

Products

Backup Battery Diode ORing

Power Switching

USB Peripherals

Uninterruptable Supplies

FWD

(mV)

OUT

(mA)

1000

1500

400

4413 TA01b

500

100

200

300

2000

LTC4413

1N5817

ENBA

GND

ENBB

470k

INA

BAT

10μF

4.7μF

4413 TA01

TO LOAD

STAT IS HIGH WHEN

BAT IS SUPPLYING

LOAD CURRENT

WALL

ADAPTER

(0V TO 5.5V)

OUTA

INB OUTB

STAT

CONTROL CIRCUIT

LTC4413

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

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

Summary of content (12 pages)

PAGE 1
LTC4413 Dual 2.6A, 2.5V to 5.5V, Ideal Diodes in 3mm × 3mm DFN FEATURES DESCRIPTION n The LTC®4413 contains two monolithic ideal diodes, each capable of supplying up to 2.6A from input voltages between 2.5V and 5.5V. Each ideal diode uses a 100mΩ P-channel MOSFET that independently connects INA to OUTA and INB to OUTB. During normal forward operation the voltage drop across each of these diodes is regulated to as low as 28mV. Quiescent current is less than 40μA for diode currents up to 1A.
PAGE 2
LTC4413 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) INA, INB, OUTA, OUTB, STAT, ENBA, ENBB Voltage .................................... –0.3V to 6V Operating Temperature Range.................. –40°C to 85°C Storage Temperature Range................... –65°C to 125°C Junction Temperature (Note 4) ............................. 125°C Continuous Power Dissipation (Derate 25mW/°C Above 70°C) .........................
PAGE 3
LTC4413 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 ILEAK VINA or VINB Current When VOUTA or VOUTB Supplies Power VIN = 0V, VOUT = 5.5V MIN –1 1 μA VRTO Reverse Turn-Off Voltage (VOUT – VIN) VIN = 3.6V –5 10 mV VFWD Forward Voltage Drop (VIN – VOUT) at IOUT = –1mA VIN = 3.
PAGE 4
LTC4413 TYPICAL PERFORMANCE CHARACTERISTICS IQF vs ILOAD IQF vs ILOAD 200 120°C 80°C 40°C 0°C –40°C 80 120°C 80°C 40°C 0°C –40°C 160 IQF (μA) 120 80 IQF AT 1A 60 120 IQF (μA) 160 IQF (μA) IQF vs Temperature 200 40 80 IQF AT 100mA 20 40 40 0 100E-6 1E-3 10E-3 100E-3 ILOAD (A) 1E+0 0 10E+0 0 1 0.50 4413 G01 1.50 ILOAD (A) 2.50 2 0 –40 3 40 0 4413 G02 IOC vs Temperature (VIN = 3.5V) RFWD vs VIN at ILOAD = 500mA UVLO Thresholds vs Temperature 120 2.
PAGE 5
LTC4413 TYPICAL PERFORMANCE CHARACTERISTICS 300 120°C 80°C 40°C 0°C –40°C 250 200 250 200 RFWD 150 150 100 100 50 50 0 IN 200mV/DIV OUT 200mV/DIV IOUT 200mA/DIV 120°C 80°C 40°C 0°C –40°C VFWD VFWD (mV) VFWD (mV) AND RFWD (mΩ) 300 Response to 800mA Load Step in 80μs VFWD vs ILOAD (VIN = 3.
PAGE 6
LTC4413 TYPICAL PERFORMANCE CHARACTERISTICS – ILEAK vs VREVERSE Efﬁciency vs Load Current 80°C 40°C 0°C –40°C 500 0.98 –ILEAK (A) EFFICIENCY (%) 1E-6 Power Loss LTC4413 vs 1N5817 600 1.00 100E-9 POWER LOSS (mW) 10E-6 0.96 0.94 400 300 1N5817 LTC4413 200 10E-9 0.92 1E-9 0 1 2 3 VREVERSE (V) 4 5 0.90 1.0E-3 100 0 10.0E-3 100.0E-3 1.0E+0 LOAD CURRENT (A) 4413 G16 10.
PAGE 7
LTC4413 BLOCK DIAGRAM 1 INA OUTA OVER CURRENT PA –+ UVLO – ENA AENA OVER TEMP ENB + OUTA (MAX) BENA OVER TEMP OUTB (MAX) STAT STB ENBA 2 – VOFF 9 VGATEA + – O.5V 10 9μA + ENA AENA A + – 3μA 3 5 GND OUTB INB OVER CURRENT 6 PB –+ – + ENBB 4 + VOFF ENB VGATEB + – O.
PAGE 8
LTC4413 OPERATION The LTC4413 is described with the aid of the Block Diagram (Figure 1). Operation begins when the power source at VINA or VINB rises 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 VINA pin is present, the power source to the LTC4413 (VDD) will be supplied from the VINA pin.
PAGE 9
LTC4413 OPERATION For short durations after the output is shorted, the current may exceed IMAX . The magnitude of this peak short-circuit current can be large, depending on the load current immediately before the short circuit occurs. During overcurrent operation, the power consumption of the LTC4413 is large, and is likely to cause an overtemperature condition as the internal die temperature exceeds the thermal shutdown temperature.
PAGE 10
LTC4413 APPLICATIONS INFORMATION 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.
PAGE 11
LTC4413 APPLICATIONS INFORMATION If the AUX is present when a wall adapter is applied, as the resistive divider to ENBB rises through the turn-off threshold, the STAT pin voltage falls and MP1 conducts, allowing the wall adapter to power the load. When the wall adapter is removed while the AUX supply is present, the load voltage falls until the voltage divider at the ENBB pin falls through its turn-on threshold.
PAGE 12
LTC4413 PACKAGE DESCRIPTION DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699 Rev B) R = 0.125 TYP 6 0.40 p 0.10 10 0.70 p0.05 3.55 p0.05 1.65 p0.05 2.15 p0.05 (2 SIDES) 3.00 p0.10 (4 SIDES) PACKAGE OUTLINE 1.65 p 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) (DD) DFN REV B 0309 5 0.200 REF 0.25 p 0.05 0.50 BSC 2.38 p0.05 (2 SIDES) 1 0.25 p 0.05 0.50 BSC 0.75 p0.05 2.38 p0.10 (2 SIDES) 0.00 – 0.