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ZXSC440 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ZXSC440
기능 DC-DC BOOST SWITCHING CONTROLLERS
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ZXSC440 데이터시트, 핀배열, 회로
ZXSC410/ZXSC420/ZXSC440
DC-DC BOOST SWITCHING CONTROLLERS
Description
The ZXSC410/420/440 are DC-DC boost controllers. Their wide input
voltage range makes them suitable for operation for a number of
battery configurations including single Li-Ion cell and 2~3
alkaline/NiCd/NiMH cells. Using high gain Diodes Zetex-brand
switching npn-transistors allows high-voltage boost ratios and/or high
output current depending on the transistor. The ZXSC410/440 has a
shutdown feature that can also be used for some dimming
functionality. ZXSC420/440 includes an End of Regulation flag that
can be used to indicate when the regulator is no longer able to
maintain the regulated output voltage/current or has reached the
required current/voltage. The ZXSC440 combines the features of the
ZXSC410 and ZXSC420 into one device.
Pin Assignments
ZXSC410 (SOT26)
VCC 1
GND 2
STDN 3
8 DRIVE
7 VFB
6 SENSE
ZXSC420 (SOT26)
VCC 1
GND 2
EOR 3
8 DRIVE
7 VFB
6 SENSE
Features
1.65V to 8V Supply Range
Typical Output Regulation of ±1%
Over 85% Typical Efficiency
Output Currents Up to 300mA
4.5µA Typical Shutdown Current ZXSC410/440
End of Regulation Output ZXSC420/440
Available in SOT26 and MSOP-8
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
ZXSC440 (MSOP-8)
DRIVE 1
VFB 2
SENSE 3
N/C 4
8 VCC
7 GND
6 EOR
5 STDN
Applications
System Power for Battery Portable Products
LCD Bias
Local Voltage Conversion
High-Brightness LED Driving
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
22µH
ZHCS2000
ZXTN25012EFH
100µF
22µF ZXSC410
18m
820m
ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 6 - 2
1 of 17
www.diodes.com
August 2015
© Diodes Incorporated




ZXSC440 pdf, 반도체, 판매, 대치품
Typical Characteristics
29.0
TA = 85°C
28.5
TA = 25°C
28.0
27.5
TA = -40°C
27.0
1
23 4 5 67
INPUT VOLTAGE (V)
Input Voltage vs. Sense Voltage
8
3.6
TA = 85°C
3.5 TA = 25°C
3.4
TA = -40°C
3.3
3.2
1
23 4 5 67
INPUT VOLTAGE (V)
Input Voltage vs. Drive Current
8
ZXSC410/ZXSC420/ZXSC440
8
ISTDN = 0V
7
TA = -40°C
6
TA = 85°C
5
TA = 25°C
4
3
2
12345 678
INPUT VOLTAGE (V)
Input Voltage vs. Shutdown Voltage
310
300
TA = 25°C
TA = -40°C
TA = 85°C
290
1
2 34 5 67
INPUT VOLTAGE (V)
Input Voltage vs. Feedback Voltage
8
ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 6 - 2
4 of 17
www.diodes.com
August 2015
© Diodes Incorporated

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ZXSC440 전자부품, 판매, 대치품
ZXSC410/ZXSC420/ZXSC440
Application Information (cont.)
Output Power Calculation
By making the above assumptions for inductance and peak current the output power can be determined by:
POUT = IAV x VIN x η = (Watts)
Where:
IAV
IPK
2
x
tON
tON
tDIS
tOFF
and,
tON IPK L
VIN
and,
tDIS
IPK L
VOUT VIN
and,
tOFF ≈ 1.7μs (internally set by ZXSC410/420/440)
and,
η = efficiency i.e. 100% = 1
Operating frequency can be derived by:
f1
tON tOFF
Output Adjustment
The ZXSC410/420/440 are adjustable output controllers allowing the end user the maximum flexibilty. They can be used both as switching
voltage regulators and as constant current regulators. A feedback voltage of 300mV provides a good compromise for both voltage and current
regulation.
For a constant output voltage operation a potential divider network is connected as follows:
VOUT
RA
VFB
The output voltage is determined by the equation:
VOUT
VFB 1
RA
RB

where VFB = 300mV
GND
RB
The resistor values, RA and RB, should be maximized to improve efficiency and decrease battery drain but not so much that they strongly affect
the accuracy. Optimization can be achieved by assuming a current of IFB(MAX) = 2.2µA out of the VFB pin. Output is adjustable from VFB to the
(BR)VCEO of the switching transistor, Q1.
Note: For the reference designs, RA is assigned the label R2 and RB the label R3.
The ZXSC410/420/440 can also be used to generate a constant current between boosted output rail and the VFB pin by connecting a single
resistor between VFB and GND.
ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 6 - 2
7 of 17
www.diodes.com
August 2015
© Diodes Incorporated

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