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ZXSC100-EVAL

P1-P3P4-P6P7-P9P10-P12P13-P13
ZXSC100
SINGLE CELL DC-DC CONVERTER SOLUTION
ZXSC100
Document number: DS33613 Rev. 6 - 2
1 of 13
www.diodes.com
January 2012
© Diodes Incorporated
ZXSC100X8 Obsolete
Closest
A
lternative is ZXSC100N8
Description
The ZXSC100 series is designed for DC-DC applications
where step-up voltage conversion from very low input
voltages is required. These applications mainly operate from
single nickel cadmium or nickel metal hydride battery cells.
The circuit can start up under full load with regulation
maintained down to an input voltage of only 0.926 volts. The
solution configuration ensures optimum efficiency over a wide
range of load currents. Several circuit configurations are
possible with loads up to 2W. The step up output voltage is
easily programmed with external resistors. With its non-
synchronous architecture an output voltage down to the input
voltage level can be achieved. For best performance the
ZXSC100 quiescent current is a small 150μA ensuring
minimum battery drain in no load conditions.
The IC and discrete combination offers the ultimate cost vs.
performance solution for single cell DC-DC conversion.
Pin Assignments
SO-8
Features
• Efficiency maintained over a wide range of input
voltages and load currents 82% efficiency @ V
BATT
= 1V
• Startup under full load
• Minimum operating input voltage V
BATT
= 0.926V
• Adjustable output voltage down to V
BATT
• Quiescent current typically 150μA referred to input
voltage
• SO-8 package in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/RoHS Compliant (Note 1)
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS
exemptions applied. Please visit our website at:
http://www.diodes.com/products/lead_free.html
Applications
• Cordless telephones
• MP3 players
• PDA
• Pagers
• Battery backup supplies
• Electronic toothbrush
• GPS receivers
• Digital camera
• Palmtop computers
• Hand held instruments
• Portable medical equipment
• Solar powered equipment
Typical Application Circuit
ZXSC100
SINGLE CELL DC-DC CONVERTER SOLUTION
ZXSC100
Document number: DS33613 Rev. 6 - 2
2 of 13
www.diodes.com
January 2012
© Diodes Incorporated
ZXSC100X8 Obsolete
Closest
A
lternative is ZXSC100N8
Pin Descriptions
Pin No. Name Description
1 EM
Emitter of internal drive transistor. Connect to RE in lower power applications. Must be
unconnected in higher power applications.
2 BAS
Only used if increased drive current to the main external NPN switching transistor is required.
(See Note 2).
3 RE
Drive current sense input. Internal threshold voltage set 25mV below V
CC
. Connected external
sense resistor. (Note 2)
4
V
CC
Supply voltage, generally NiMH, NiCd single cell.
5
I
SENSE
Inductor current sense input. Internal threshold voltage set to 25mV. Connect external sense
resistor.
6 FB
Feedback sense. Internal threshold set to 730mV. Connect external resistive divider to output
voltage.
7 GND Ground
8
V
DRIVE
Drive output for external switching transistor.
Connect to base of external bipolar transistor. For increased drive current see Note 2
Note: 2. In higher load current applications an additional PNP can be used to increase the drive current of the main external NPN switching transistor.
The PNP base should be connected to BAS pin, its emitter to the RE pin and its collector connected to V
DRIVE
pin.
Functional Block Diagram
Absolute Maximum Ratings
Description Rating Unit
Supply Voltage 0.3 to 3.5 V
Maximum Voltage Other Pins
0.3 to V
CC
+0.3
V
Power Dissipation (25°C)
SO-8
780
mW
Operating Temperature 0 to 70 °C
Storage Temperature -55 to +150 °C
Junction Temperature 150 °C
ZXSC100
SINGLE CELL DC-DC CONVERTER SOLUTION
ZXSC100
Document number: DS33613 Rev. 6 - 2
3 of 13
www.diodes.com
January 2012
© Diodes Incorporated
ZXSC100X8 Obsolete
Closest
A
lternative is ZXSC100N8
Operating Conditions
Symbol Parameter Min Typ. Max Unit
F
OSC
Recommended operating frequency (Note 3)
200 kHz
Note: 3. Operating frequency is application circuit dependent. See application section.
Electrical Characteristics (T
A
= 25°C, V
CC
= 1.2V; unless otherwise specified)
Symbol Parameter Conditions Min Typ Max Units
I
CC
Quiescent current Not switching 150 200 µA
I
DRIVE
Base drive current
V
RE
= V
CC
5 10 mA
V
DRIVE
V
DRIVE
o/p voltage V
RE
= V
CC
, I
DRIVE
= 5mA V
CC
– 0.17
V
V
FB
Feedback voltage 708 730 752 mV
V
ISENSE
Output current reference voltage 12 17.5 24 mV
T
CVISENSE
I
SENSE
voltage temp co.
0.4 %/°C
V
DREF
Drive current refernce voltage
Measured with respect to V
CC
20 30 40 mV
T
CVDREF
V
DREF
temp co.
1 %/°C
V
CC(SRT)
Startup voltage Any output load 1.01 1.06 1.1 V
V
CC(MIN)
Minimum operating input voltage 0.926 0.98 1 V
V
CC(HYS)
Supply start up to shutdown
hysteresis
80 mV
I
FB
Feedback input current 100 200 nA
I
SENSE
ISENSE input current
V
ISENSE
= 0V
3 4 5.5 µA
V
O(MIN)
Minimum output voltage
V
CC
V
V
O(MAX)
Maximum output voltage
FMMT617 as pass element
(Note 4)
20 V
T
OFF
Discharge pulse width 1.7 3 µs
Note: 4. Depends on breakdown voltage of pass device. See FMMT617 datasheet
P1-P3P4-P6P7-P9P10-P12P13-P13

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