MAX14514 データシートの表示（PDF） - Maxim Integrated

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MAX14514

Dual Electroluminescent Lamp Driver

Maxim Integrated 

MAX14514

Dual Electroluminescent Lamp Driver

The MAX14514 boost converter frequency uses an inter-

nal switch oscillator to set the desired frequency of the

boost converter. The boost converter frequency is adjust-

ed by either 1) the combination of a resistor from SLEW

to GND and an external capacitor from SW to GND, or 2)

by driving a PWM signal directly into the SW input. When

SW is driven with an external PWM signal at a suggested

90% duty cycle, the boost converter frequency is changed

to the frequency of the external PWM signal. (See the

CSW Capacitor Selection section for choosing the CSW

capacitor value.)

Shutdown

The MAX14514 features a shutdown mode to disable the

device and reduce supply current. Entering and exiting

shutdown mode depends on if slow turn-on/turn-off is

enabled or disabled.

When slow turn-on/turn-off is enabled, shut down the

device by driving EN low. Enable the device by driving

EN high.

When slow turn-on/turn-off is disabled, shut down the

device by driving EN low and both DIM1 and DIM2 below

VIL_DIM_. Enable the device by driving EN high and either

DIM1 or DIM2 above VLPD_.

Undervoltage Lockout (UVLO)

The MAX14514 has a UVLO threshold of +2.1V (typ).

When VDD falls below this threshold, the device enters a

nonoperative mode.

Thermal Short-Circuit Protection

The MAX14514 enters a nonoperative mode if the internal

die temperature of the device reaches or exceeds +158°C

(typ). The device turns back on when the internal die tem-

perature cools to +150°C (typ).

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures are

incorporated on all pins to protect against electrostatic

discharges encountered during handling and assembly.

The EL lamp driver outputs of the MAX14514 (V1, V2,

and COM) have extra protection against static electric-

ity. Maxim’s engineers have developed state-of-the-art

structures to protect these pins against ESD of ±15kV

without damage. The ESD structures withstand high ESD

in all states: normal operation, shutdown, and powered

down. After an ESD event, the MAX14514 keeps working

without latchup or damage. ESD protection can be tested

in various ways. The transmitter EL lamp outputs of the

MAX14514 are characterized for protection to the follow-

ing limits:

• ±15kV using the Human Body Model

• ±4kV IEC 61000-4-2 Contact Discharge

• ±4kV IEC 61000-4-2 Air-Gap Discharge

ESD Test Conditions

ESD performance depends on a variety of conditions.

Contact Maxim for a reliability report that documents test

setup, test methodology, and test results.

Human Body Model

Figure 1a shows the Human Body Model, and Figure

1b shows the current waveform it generates when dis-

charged into a low impedance. This model consists of a

100pF capacitor charged to the ESD voltage of interest,

which is then discharged into the test device through a

1.5kΩ resistor.

IEC 61000-4-2

The IEC 61000-4-2 standard covers ESD testing and

performance of finished equipment. However, it does not

specifically refer to integrated circuits. The MAX14514

assists in designing equipment to meet IEC 61000-4-2

without the need for additional ESD-protection compo-

nents.

The major difference between tests done using the

Human Body Model and IEC 61000-4-2 is higher peak

current in IEC 61000-4-2 because series resistance is

lower in the IEC 61000-4-2 model. Hence, the ESD with-

stand voltage measured to IEC 61000-4-2 is generally

lower than that measured using the Human Body Model.

Figure 1c shows the IEC 61000-4-2 model, and Figure

1d shows the current waveform for IEC 61000-4-2 ESD

Contact Discharge test.

The air-gap test involves approaching the device with a

charged probe. The contact discharge method connects

the probe to the device before the probe is energized.

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