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PDF SCI7654C0A Data sheet ( Hoja de datos )
| Número de pieza | SCI7654C0A | |
| Descripción | (SCI7654M0A / SCI7654C0A) DC/DC Converter | |
| Fabricantes | Epson Company | |
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( DataSheet : www.DataSheet4U.com )
PF754-03
SCI7654M0A/C0A
DC/DC Converter
Double/Triple/Quadruple Boosting
95% Excellent Power Conversion Efficiency
Built-in Voltage Regulator
DESCRIPTION
The SCI7654 is a highly efficient, but low power-consumption DC-to-DC converter based on the advanced CMOS
technologies. It can generate an output voltage double/triple/quadruple times higher than the input (in negative
direction) if 4/3/2 external capacitors are attached.
With a built-in voltage regulator, the SCI7654 can provide a stable output by setting the DC/DC output to any voltage
via two external resistors. This is optimum to the LCD panel power supply as the stable output can have the negative
temperature gradient required for an LCD panel.
FEATURES
An input voltage can be boosted double/triple/quadruple to negative potential.
Input voltages: –2.4 to –5.5V (quadruple boosting), –2.4 to –7.3V (triple boosting), –2.4 to –11.0V (double
boosting)
Excellent vol tage conversion efficiency: 95% (Typ.)
Large output current: 20 mA (Max.) during quadruple boosting
Built-in voltage regulator (for stable voltage output)
Built-in reference voltage source for accurate regulation: –1.5 ±0.05V (CT0)
Regulator output voltage temperature gradient function: –0.04, –0.15, –0.35, –0.55%/˚C
Low current consumption: 130 µA (Typ.)
Low standby current: 5.0 µA (Max.)
Built-in oscillator circuit
5/6-time voltage boosting in negative potential by serial connection
Package: SCI7654M0A SSOP2-16pin (plastic), SCI7654C0A DIP-16pin (plastic)
BLOCK DIAGRAM
VDD
POFF1
POFF2
FC
VIN
Power-Off
Control
Clock
Generator
Ref. Voltage
Circuit
Booster Control
Voltage Regulator
Voltage Converter
TC1
TC2
RV
VREG
VRI
VOUT
C1P C1N C3N
C2P C2N
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SCI7654M0A/C0A
FUNCTIONAL DESCRIPTION
Clock Generator Circuit
As the SCI7654 has a built-in clock generator circuit, it requires no external source at all. The clock rate changes
depending on the FC pin signal level, and the Low Output or High Output mode can be selected. This allows
a frequency selection according to the current capacitance and load current when the booster output impedance
changes depending on the clock rate and external booster capacitance.
FC pin
H (VDD)
L (VIN)
Mode
Low Output
High Output
Clock Rate
4.0 kHz (Typ.)
16.0 kHz (Typ.)
Current Consumption
IOP
Approx. 4 times of IOP
Output Ripple
VRP
Approx. 1/4 time of VRI
Voltage Converter Circuit
The voltage converter receives a clock from the clock generator, and boosts the VIN input power voltage
quadruple, triple or double. Four converter circuits are required for quadruple boosting, three converts are
required for triple boosting, and dual converters are required for double boosting.
VDD
(0V)
VIN
10V (-5V)
double boosting
15V
-10V
triple boosting
-15V
20V
-20V
quadruple boosting
Voltage step-up diagram (during -5V input)
Reference Voltage Circuit
The SCI7654 has a built-in reference voltage circuit for the voltage regulator. The temperature coefficient of
reference voltage can be changed using pins TC1 and TC2, and a voltage having one of four types of temperature
gradients can be output at VREG pin for LCD driving.
Mode
CT0
CT1
CT2
CT3
TC1
H(VDD)
H
L(VIN)
L
TC2
H(VDD)
L(VIN)
H
L
Reference Voltage, VREF (V)
Min. Typ. Max.
-1.55 -1.5 -1.45
-1.70 -1.5 -1.30
-1.90 -1.5 -1.10
-2.15 -1.5 -0.85
Temperature Coefficient, CT (%/˚C)
Min. Typ. Max.
-0.07
-0.04
0
-0.25
-0.15
-0.07
-0.45
-0.35
-0.20
-0.75
-0.55
-0.30
5
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| PDF Descargar | [ Datasheet SCI7654C0A.PDF ] | |
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