ISL6413EVAL1【PDF 6/12 页】EVALUATION BOARD ISL6413

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Application Note 1081

Current Limit

The ISL6413 monitors and controls the pass transistor ’s

gate voltage to limit the output current. The current limit for

LDO1 is 330mA and LDO2 is 250mA. The output can be

shorted to ground without damaging the part due to the

current limit and thermal protection features.

Integrated RESET for MAC/Baseband

Processors

The ISL6413 includes a microprocessor supervisory block.

This block eliminates the extra RESET IC and external

components needed in wireless chipset applications. This

block performs a single function; it asserts a RESET signal

whenever the V IN supply voltage decreases below a preset

threshold, keeping it asserted for a programmable time (set

by external capacitor CT) after the V IN pin voltage has risen

above the RESET threshold.

The push pull output stage of the reset circuit provides both

an active-Low and an active-High output. The RESET

threshold for ISL6413 is 2.630V typical.

UVLO Reset threshold is always lower than the RESET

threshold. This insures that as V IN falls, the reset goes low

before the LDOs and PWM are shut off.

Thermal Overload Protection

Thermal overload protection limits total power dissipation in

the ISL6413. When the junction temperature (T J ) exceeds

+150°C, the thermal sensor sends a signal to the shutdown

logic, turning off the pass transistor and allowing the IC to

cool. The pass transistor turns on again after the IC’s

junction temperature typically cools by 20°C, resulting in a

pulsed output during continuous thermal overload

conditions. Thermal overload protection protects the

ISL6413 against fault conditions. For continuous operation,

do not exceed the absolute maximum junction temperature

rating of +150°C.

Operating Region and Power Dissipation

The maximum power dissipation of ISL6413 depends on the

thermal resistance of the IC package and circuit board, the

temperature difference between the die junction and ambient

air, and the rate of air flow. The power dissipated in the

device is:

PT = P1 + P2 + P3, where

P1 = (I OUT x V OUT ) x n, n is efficiency of the PWM

P2 = I OUT1 (V IN - V OUT1 )

P3 = I OUT2 (V IN - V OUT2 )

The maximum power dissipation is:

Pmax = (Tjmax – T A )/ θ JA

Where Tjmax = 150 o C, T A = ambient temperature, and θ JA

is the thermal resistance from the junction to the surrounding

environment.

The ISL6413 package features an exposed thermal pad on

its underside. This pad lowers the thermal resistance of the

package by providing a direct heat conduction path from the

die to the PC board. Additionally, the ISL6413’s ground

(GND_LDO and PGND) performs the dual function of

providing an electrical connection to system ground and

channeling heat away. Connect the exposed backside pad

direct to the GND_LDO ground plane.

Application Information

LDO Regulator Capacitor Selection and Regulator

Stability

Capacitors are required at the ISL6413 LDO regulators’

input and output for stable operation over the entire load

range and the full temperature range. Use >1μF capacitor at

the input of LDO regulators, V IN _LDO pins. The input

capacitor lowers the source impedance of the input supply.

Larger capacitor values and lower ESR provide better PSRR

and line transient response. The input capacitor must be

located at a distance of not more than 0.5 inches from the

V IN pins of the IC and returned to a clean analog ground.

Any good quality ceramic capacitor can be used as an input

capacitor.

The output capacitor must meet the requirements of

minimum amount of capacitance and ESR for both LDO’s.

The ISL6413 is specifically designed to work with small

ceramic output capacitors. The output capacitor ’s ESR

affects stability and output noise. Use an output capacitor

with an ESR of 50m ? or less to insure stability and optimum

transient response. For stable operation, a ceramic

capacitor, with a minimum value of 3.3μF, is recommended

for V OUT1 for 300mA output current, and 3.3μF is

recommended for V OUT2 at 200mA load current. There is no

upper limit to the output capacitor value. A larger capacitor

can reduce noise and improve load transient response,

stability and PSRR. A higher value of output capacitor

(10μF) is recommended for LDO2 when used to power VCO

circuitry in wireless chipsets. The output capacitor should be

located very close to V OUT pins to minimize impact of PC

board inductances and the other end of the capacitor should

be returned to a clean analog ground.

PWM Regulator Component Selection

Inductor Selection

A 10μH typical output inductor is used with the ISL6413

PWM section. Values larger than 15μH or less than 8μH may

cause stability problems because of the internal

compensation of the regulator. The important parameters of

the inductor that need to be considered are the current rating

of the inductor and the DC resistance of the inductor. The

DC resistance of the inductor will influence the efficiency of

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