Zetex Semiconductors PLC ZXLD1615-1601 User Manual

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Company proprietary – Sales network use only

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www.zetex.com

Know–ho

ZXLD1615/1601 boost converter for
LCD-OLED bias and DC-DC suppl

New product in formation f rom Zetex Ju l y 2 0 0 4

Features Benefits

• Internal 30V NMOS switch

• True analog output voltage control

• High efficiency: 80% typical

• 2.5V to 5.5V supply range

• Low quiescent current

• TSOP23-5 and SC70-6 packages

• ZXLD1615 is pin compatible to LT1615

Applications

• LCD and OLED biasing

• Varactor diode biasing

• DC-DC boost converter

• Minimum external components

• Reduced flicker

• Longer battery life

• Compatible with Li-Ion battery

• Longer battery life

• Minimum board area

• Alternate source to LT1615

• Cell phones

• Digital cameras

• PDAs

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Functional Description

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The ZXLD1615 and ZXLD1601 are PFM
inductive DC-DC boost converters. They are
particularly suited to provide bias voltages for
LCD and OLED displays. Up to 28V can be
generated from an input voltage between 2.5
and 5.5V.

The switch is integrated on chip together with
the peak current sense resistor. An output
current of 10mA is available at 28V, with
proportionally higher currents at lower
voltages.

The output voltage is set by 2 external
resistors connected to the feedback input.
PWM control at the enable input can be used
to adjust this voltage. An on chip filter
enables flicker free control at PWM
frequencies above 10kHz, or normal gated
control below 1kHz.

Description Vin (V)

Output

voltage

Typical

quiescent

current (µA)

Quiescent current is typically 60µA. At
shutdown the maximum current is 100nA.

The ZXLD1615ET5 is packaged in a low
profile TSOT23-5 package. Maximum
package height is 1mm. The ZXLD1601 is
packaged in a small footprint SC70-6
package.

The ZXLD1615ET5 is pin compatible with
LT1615, TPS61040 and SP6690. In many
applications the ZXLD1615 can replace
these parts. Input voltage range is the main
difference. Most other parameters are the
same or very close.

Shutdown

current (nA)

Efficiency

%

Switching
frequency

(kHz)

Package

ZXLD1615ET5

ZXLD1601H6

2.5 to

5.5

2.5 to

5.5

Up to 28V 60 100 80 600 TSOT23-5

Up to 28V 60 100 80 600 SC70-6

Applications Information

The data sheets contain information about the operation of each converter and how the
internal blocks function. The data sheets also contains additional applications information
on:

• 1cell Li-Ion to 3.3V SEPIC converter

• 1cell Li-Ion to 5V SEPIC converter

• Triple output boost converter for LCD or OLED bias

• Selecting inductors, capacitors and diodes.

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