DO1608-103 DIODES [Diodes Incorporated], DO1608-103 Datasheet

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DO1608-103

Manufacturer Part Number
DO1608-103
Description
ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH
Manufacturer
DIODES [Diodes Incorporated]
Datasheet
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
FEATURES
ISSUE 3 - AUGUST 2004
Internal 30V NDMOS switch, current sense and
output setting resistors.
True analogue output voltage control via PWM
with internal filter
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
Up to 250mA output current at 5V
Low quiescent current: (60 A typ)
100nA maximum shutdown current
Up to 1MHz switching frequency
Low external component count
TOP VIEW
PINOUT
1
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
Cellular / mobile phones
Digital cameras
PDAs
LCD modules
Varactor and PIN diode bias
Palmtop computers
TYPICAL APPLICATION CIRCUIT
ZXLD1601
S E M I C O N D U C T O R S

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DO1608-103 Summary of contents

Page 1

ADJUSTABLE BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 DESCRIPTION The ZXLD1601 is a PFM inductive boost converter designed to provide output voltages 28V from a 2.5V to 5.5V input supply. The ZXLD1601 includes the ...

Page 2

ZXLD1601 ABSOLUTE MAXIMUM RATINGS (Voltages to GND unless otherwise stated) Input voltage ( output voltage (V ) 30V LX Switch output current (I ) 500mA LX Power dissipation (PD) 300mW Operating temperature (T ) -40 to ...

Page 3

ELECTRICAL CHARACTERISTICS (Cont.): Symbol Parameter T/T PWM duty cycle range at ‘EN’ input for dc output voltage control fLPF Internal PWM low pass filter cut-off frequency ALPF Filter attenuation (4) T/T PWM duty cycle range at ‘EN’ input for ‘gated’ ...

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ZXLD1601 PIN DESCRIPTION Pin No. Name Description LX Output of NDMOS switch 1 2 GND Ground (0V Feedback pin for voltage control loop Nominal voltage 1.025V 4 EN Enable input (active high to turn on device) Also used ...

Page 5

Device Description The device is a PFM flyback dc-dc boost converter, working in discontinuous mode. With reference to the chip block diagram and typical application circuit, the operation of the device is as follows: Control loop When ‘EN’ is high, ...

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ZXLD1601 TYPICAL CHARACTERISTICS 6 ISSUE 3 - AUGUST 2004 ...

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TYPICAL PERFORMANCE GRAPHS (For typical applications circuit ISSUE 3 - AUGUST 2004 =3V, L=22µH Murata LQH32CN series ZXLD1601 =25°C unless otherwise stated ...

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ZXLD1601 APPLICATIONS Setting output voltage When connected as shown in the typical application circuit, the ZXLD1601 will produce a nominal default output of between 26V and 28V. This is set by the internal potential divider comprising of resistors R1 and ...

Page 9

... L/V LX(peak) nominal 5µs maximum ‘on’ time limit for the LX output. Part No. L DCR ( CMD4D11-100MC 10 0.457 DO1608-103 10 0.16 LQH31CN100 10 1.3 LB2012Y100MR 10 0.5 ISSUE 3 - AUGUST 2004 For maximum stability over temperature, capacitors with X7R dielectric are recommended, as these have a much smaller temperature coefficient than other types. ...

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ZXLD1601 Diode selection The rectifier diode (D1) should be a fast low capacitance Schottky diode with low reverse leakage at the working voltage. It should also have a peak current rating above the peak coil current and a continuous current ...

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NOTES: ISSUE 3 - AUGUST 2004 ZXLD1601 ...

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ZXLD1601 PACKAGE OUTLINE ORDERING INFORMATION DEVICE DEVICE DESCRIPTION ZXLD1601H6 Boost converter in SC70-6 -40°C to +85°C TA reels 3000 devices, TC reels 10000 devices © Zetex Semiconductors plc 2004 Europe Americas Zetex GmbH Zetex Inc Streitfeldstraße 19 700 Veterans Memorial ...

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