Zetex Semiconductors PLC ZXLD1615-1601 User Manual

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Know–how

New product information from Zetex

July 2004

ZXLD1615/1601 boost converter for

LCD-OLED bias and DC-DC supply

Features

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

Benefits

Minimum external components

Reduced flicker

Longer battery life

Compatible with Li-Ion battery

Longer battery life

Minimum board area

Alternate source to LT1615

Applications

LCD and OLED biasing

Cell phones

Varactor diode biasing

Digital cameras

DC-DC boost converter

PDAs

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Functional Description

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.

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.

Description

Vin (V)

Output

Typical

Shutdown

Efficiency

Switching

Package

quiescent

frequency

voltage

current (nA)

%

 

 

current (µA)

(kHz)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ZXLD1615ET5

2.5 to

Up to 28V

60

100

80

600

TSOT23-5

5.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ZXLD1601H6

2.5 to

Up to 28V

60

100

80

600

SC70-6

5.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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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