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SC1650 PDF даташит

Спецификация SC1650 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «HIGH-VOLTAGE INVERTING DC-DC CONVERTER».

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Номер произв SC1650
Описание HIGH-VOLTAGE INVERTING DC-DC CONVERTER
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1650 Даташит, Описание, Даташиты
HIGH-VOLTAGE INVERTING
DC-DC CONVERTER
SC1650
January 29, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1650 is a high performance inverting DC-DC
converter, designed to drive an external power switch
to generate programmable negative voltages. In the
particularly suitable LCD bias contrast application,
maximum efficiency of 90% can be achieved with low
cost PNP bipolar transistor drivers. The 4V to 24V
input operation range allows the SC1650 to be
powered directly by the battery pack in most battery-
operated applications for greater efficiency. The output
voltage can be scaled to -40V by two external
resistors. A pulse frequency modulation scheme is
employed to maintain high efficiency conversion under
wide input voltage ranges. Quiescent current is about
100µA and can be reduced to 8µA in shutdown mode.
With a switching frequency range of 100kHz to
320kHz, small size switching components may be
used, which is ideal for battery powered portable
equipment such as notebook and palmtop computers.
BLOCK DIAGRAM
FEATURES
4V to 24V input voltage operation
Adjustable output voltage up to -40V
Low quiescent current at 100µA
Pulse frequency modulation maintains high
efficiency (max 90%)
100kHz to 320kHz switching frequency
Power-Saving shutdown mode (8µA typical)
High efficiency with low cost external PNP bipolar
transistor
APPLICATIONS
Negative LCD contrast bias for
1. Notebook & palmtop computers
2. Pen-based data systems
3. Portable data collection terminals
4. Personal digital assistants
Negative voltage supplies
ORDERING INFORMATION
DEVICE(1)
SC1650CS
VOUT
Adj
Note:
(1) Add suffix ‘TR’ for tape and reel.
PACKAGE
SO-8
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
SHDN Voltage
Operating
Temperature
Range
Storage
Temperature
Range
Symbol
V+
VSHDN
TA
Maximum
24
15
0 to 70
Units
V
V
°C
TSTG
-65 to 125
°C
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1650 Даташит, Описание, Даташиты
HIGH-VOLTAGE INVERTING
DC-DC CONVERTER
January 29, 1998
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, TA = 25°C, V+ = 13V
Test Conditions
Parameter
Input Voltage
Switch Off Current
Shutdown Mode Current
VFB = -50mV
VREF Voltage
VREF Source Current
DLOW “ON Resistance”
ISOURCE=250µA
DHI “ON Resisance”
CL Threshold
Shutdown Threshold
Min
4
1.16
250
45
0.8
Test Limits
Typ
100
8
1.22
15
10
60
1.5
TYPICAL PERFORMANCE CHARACTERISTICS
SC1650
Max
24
200
20
1.28
75
2.4
Units
V
µA
µA
V
µA
mV
V
TYPICAL APPLICATION CIRCUIT
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1650 Даташит, Описание, Даташиты
HIGH-VOLTAGE INVERTING
DC-DC CONVERTER
January 29, 1998
TYPICAL APPLICATION INFORMATION
SC1650
© 1997 SEMTECH CORP.
The typical application circuit generates an adjustable negative voltage
for contrast bias of LCD displays. Efficiency and output power can be
optimized by using the appropriate inductor and switch. The following
formulas provide a guideline for determing the optimal component val-
( )L = 11.10.15 × V + ×
V+
IOUT × VOUT
PNP : VCEO > V + + VOUT
IC (MAX )
200 ×
IOUT
V+
VCE ( SAT )
<
0.4V
at
IC
= 200
×
IOUT
V+
and β = 10
( )RB 3 × L × V + 0.8 , where units : V + in Volt, VOUT in Volt ,
IOUT in Ampere , L in µH,
RB in Ohm.
652 MITCHELL ROAD NEWBURY PARK CA 91320










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