LTC4370IDE-TRPBF Ver la hoja de datos (PDF) - Linear Technology

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LTC4370IDE-TRPBF

Two-Supply Diode-OR Current Balancing Controller

Linear Technology 

LTC4370

Pin Functions

COMP: Error Amplifier Compensation. Connect a capacitor

from this pin to GND. The value of this capacitor should be

approximately 10 to 50 times the gate capacitance (CISS)

of the MOSFET switch. Maintain low board leakage on this

pin for best load sharing accuracy. For example, 100nA

of leakage current (equal to 1V across 10MΩ) increases

the error amplifier offset by 0.7mV. Leave this pin open

if only using ideal diode mode.

CPO1, CPO2: Charge Pump Output. Connect a capacitor

from this pin to the corresponding VIN pin. The value of

this capacitor should be approximately 10× the gate ca-

pacitance (CISS) of the MOSFET switch. The charge stored

on this capacitor is used to pull up the gate during a fast

turn-on. Leave this pin open if fast turn-on is not needed.

EN1, EN2: Enable Input. Keep this pin below 0.6V to enable

sharing and diode control on the corresponding supply.

Driving this pin high shuts off the MOSFET gate (current

can still flow through its body diode). The comparator has

a built-in hysteresis of 8mV. Having both EN pins high

lowers the current consumption of the device.

Exposed Pad (DE Package Only): The exposed pad may

be left open or connected to device ground.

FETON1, FETON2: MOSFET Status Output. This pin is

pulled low by an internal switch when GATE is less than

0.7V above VIN to indicate an off MOSFET. Because of this,

it may also signal off if small currents are flowing through

a high-gm MOSFET with a large forward voltage across

it. An internal 500k resistor pulls this pin up to a diode

below VCC. It may be pulled above VCC using an external

pull-up. Tie to GND or leave open if unused.

GATE1, GATE2: MOSFET Gate Drive Output.Connect this

pin to the gate of the external N-channel MOSFET switch.

An internal clamp limits the gate voltage to 12V above,

and a diode below the input supply. During fast turn-on,

a 1.4A pull-up current charges GATE to CPO. During fast

turn-off, a 1.4A pull-down current discharges GATE to VIN.

GND: Device Ground.

OUT1, OUT2: Output Voltage and Current Sense Input.

Connect this pin to the input side of the supply’s current

sense resistor. A Kelvin connection is important for ac-

curate current sharing. The voltage sensed at this pin is

used to control the MOSFET gate.

RANGE: Supply Differential Voltage Load Sharing Range.

Connect a resistor (below 60k) from this pin to GND. A

10μA internal pull-up current source into this resistor

sets the pin voltage VRANGE. The two supplies will typi-

cally share the load current if their voltage difference is

within ±VRANGE. The maximum sharing range is ±0.6V,

obtained by leaving RANGE open. Connecting this pin to

VCC disables load share control and the device behaves

as a dual ideal diode controller.

VCC: Low Voltage Supply. Connect a 0.1μF capacitor from

this pin to ground. For VIN ≥ 2.9V this pin provides decou-

pling for an internal regulator that generates a 5V supply.

For applications where both VIN < 2.9V, also connect an

external supply in the 2.9V to 6V range to this pin.

VIN1, VIN2: Voltage Sense and Supply Input. Connect

this pin to the supply side of the MOSFET. The low volt-

age supply VCC is generated from the higher of VIN1 and

VIN2. The voltage sensed at this pin is used to control the

MOSFET gate.

4370f

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