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PDF ZXSC410 Data sheet ( Hoja de datos )

Número de pieza ZXSC410
Descripción VOLTAGE MODE BOOST CONVERTER
Fabricantes Zetex Semiconductors 
Logotipo Zetex Semiconductors Logotipo



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No Preview Available ! ZXSC410 Hoja de datos, Descripción, Manual

VOLTAGE MODE BOOST CONVERTER
ZXSC410
ZXSC420
DESCRIPTION
The ZXSC410 is voltage mode boost converter in SOT23-6 package. Its excellent
load and line regulation means that for the full supply range from lithium Ion cells,
the output voltage will typically change by less than 1%. Using high efficiency
Zetex switching transistors allow output voltages of tens of volts depending on the
selected transistor. The ZXSC420 includes a battery low indicator. This operates
by indicating when the converter is no longer able to maintain the regulated
output voltage rather than setting a preset threshold, thereby making it suitable for
various battery options and load currents.
FEATURES
1.65V to 8V supply range
Typical output regulation of ±1%
Over 85% typical efficiency
Output currents up to 300mA
4.5A typical shutdown current ZXSC410
End of regulation output ZXSC420
APPLICATIONS
System power for battery portable products
LCD bias
Local voltage conversion
SOT23-6
ORDERING INFORMATION
DEVICE
ZXSC410E6TA
ZXSC420E6TA
REEL TAPE QUANTITY
SIZE WIDTH PER REEL
7” 8mm 3000 units
7” 8mm 3000 units
TYPICAL APPLICATIONS DIAGRAM
VIN
C1
L1
D1
ZHCS1000
VOUT
U1
VCC DRIVE
STDN SENSE
GND VFB
ZXSC410
Q1
FMMT617
R2
C2
R1 R3
DEVICE MARKING
C410 ZXSC410
C420 ZXSC420
ISSUE 2 - May 2003
1 SEMICONDUCTORS

1 page




ZXSC410 pdf
PIN DESCRIPTIONS
Pin No.
1
2
3
4
Name
VCC
GND
STDN/EOR
SENSE
5 VFB
6 DRIVE
ZXSC410
ZXSC420
Description
Supply voltage, 1.8V to 8V.
Ground
Shutdown ZXSC410 / End of regulation ZXSC420
Inductor current sense input. Internal threshold voltage set to
28mV. Connect external sense resistor.
Reference voltage. Internal threshold set to 300mV. Connect
external resistor network to set output voltage.
Drive output for external switching transistor. Connect to base or
gate of external switching transistor.
APPLICATIONS INFORMATION
Switching transistor selection
The choice of switching transistor has a major impact
on the converter efficiency. For optimum performance,
a bipolar transistor with low VCE(SAT) and high gain is
required. The VCEO of the switching transistor is also an
important parameter as this sees the full output
voltage when the transistor is switched off. Zetex
SuperSOTtransistors are an ideal choice for this
application.
Inductor Selection
The inductor value must be chosen to satisfy
performance, cost and size requirements of the overall
solution.
Inductor selection has a significant impact on the
converter performance. For applications where
efficiency is critical, an inductor with a series resistance
of 500mor less should be used.
Schottky diode selection
As with the switching transistor, the Schottky rectifier
diode has a major impact on the converter efficiency. A
Schottky diode with a low forward voltage and fast
recovery time should be used for this application.
The diode should be selected so that the maximum
forward current rating is greater or equal to the
maximum peak current in the inductor, and the
maximum reverse voltage is greater or equal to the
output voltage. The Zetex ZHCS Series meet these
needs.
A list of recommended inductors is listed in the table
below:
Part No.
Manufacture
L IPK RDC
(A) ( )
CMD4D11-100MC Sumida
10µH 0.5 0.457
CMD4D11-220MC Sumida
22µH 0.4 0.676
LPO2506OB-103 Coilcraft
10µH 1.0 0.24
ST2006103
Standex
10µH 0.6 0.1
Electronics Inc
Combination devices
To minimise the external component count Zetex
recommends the ZX3CDBS1M832 combination of
NPN transistor and Schottky diode in a 3mm x 2mm
MLP package. This device is recommended for use in
space critical applications.
The IC is also capable of driving MOSFETs. Zetex
recommends the ZXMNS3BM832 combination of low
threshold voltage N-Channel MOSFET and Schottky
diode in a 3mm x 2mm MLP package. This device is
recommended for use in space critical applications.
Peak current definition
In general, the IPK value must be chosen to ensure that
the switching transistor, Q1, is in full saturation with
maximum output power conditions, assuming
worse-case input voltage and transistor gain under all
operating temperature extremes.
Once IPK is decided the value of RSENSE can be
determined by:
RSENSE
=
VSENSE
IPK
ISSUE 2 - May 2003
5 SEMICONDUCTORS

5 Page





ZXSC410 arduino
ZXSC410
ZXSC420
Sequencing AVDD and VON
By adding the circuit below to the LCD bias output (VON) of
the converter a 10ms delay can be achieved between
AVDD power up and VON power up. The circuit operates by
a delay in turning the PMOS transistor on, which transfers
to a 10ms delay between input and output of the circuit.
The delay is set by the RC time constant of R1 and C1.
The diode, D1, discharges the gate of the PMOS when
the main system supply is turned off, guaranteeing a
delay every turn on cycle.
ISSUE 2 - May 2003
11 S E M I C O N D U C T O R S

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