ZXLD1601 Datasheet, PDF (1/12 Pages) Zetex Semiconductors – ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70

ZXLD1601
ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH
IN SC70
DESCRIPTION
The ZXLD1601 is a PFM inductive boost converter
designed to provide output voltages of up to 28V from
a 2.5V to 5.5V input supply.
The ZXLD1601 includes the output switch and peak
current sense resistor, and can provide up to 10mA
output current at maximum output voltage. Higher
current is available at lower output voltages.
Quiescent current is typically 60␮A and a shutdown
function is provided to reduce this current to less than
100nA in the ‘off’ state.
ADVANCED FEATURES
• Internal 30V NDMOS switch, current sense and
output setting resistors.
Output voltage is set to a nominal value between 26V
and 28V, by an internal resistor network, but can be
adjusted to lower values by external resistors, an
external PWM control signal applied to the ‘Enable’
pin, or a combination of the two. Depending upon the
control frequency, the PWM signal will provide either
continuous (low ripple) or gated control. The PWM
filter components are contained within the chip.
Minimum output voltage is determined by the input
supply.
The device is assembled in a low profile SC70-6 pin
package.
APPLICATIONS
• LCD and OLED bias
• True analogue output voltage control via PWM
with internal filter
FEATURES
• Low profile SC70-6 pin package
• Internal PWM filter for adjustable output
• High efficiency (85% typ)
• Wide input voltage range: 2.5V to 5.5V
• Cellular / mobile phones
• Digital cameras
• PDAs
• LCD modules
• Varactor and PIN diode bias
• Palmtop computers
• Up to 250mA output current at 5V
• Low quiescent current: (60␮A typ)
TYPICAL APPLICATION CIRCUIT
• 100nA maximum shutdown current
• Up to 1MHz switching frequency
• Low external component count
PINOUT
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ISSUE 3 - AUGUST 2004
1
SEMICONDUCTORS