RICOH R1250V××1A Technical data
R1250V201A
Negative Output Charge Pump
Regulator (100mA)
R1250V××1A SERIES
APPLICATION MANUAL
NO. EA-076-0012
Negative Output Charge
Pump Regulator (100mA)
R1250V××1A SERIES
OUTLINE
The R1250V××1A Series are Negative Output Charge Pump Regulator ICs, which can be developed as local power suppliers for portable appliances and small electric appliances used with batteries, with low supply current by CMOS process.
Each of these ICs consists of an oscillator, a control circuit, a reference voltage unit, an error amplifier, and an output driver circuit. The R1250V××1A can easily supply negative voltage, or regulated setting output voltage in the range from -2V to -4V from positive input voltage.
The chip enable function works to shut down the internal circuit and reduces supply current at the stand-by mode, therefore the R1250V××1A is very suitable for the application such as portable systems that require low supply current.
Since the package for this IC is TSSOP8 package (TSOP8 in EIAJ standard), high density mounting of the ICs on board is possible.
FEATURES
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Output Current..................... |
100mA (MAX. at VIN=5.0V, CIN=CP=COUT=4.7µF, Set Output Voltage=-3.0V) |
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Output Voltage Accuracy...... |
±3.0% (VIN=5.0V, CIN=CP=COUT=4.7µF, Set Output Voltage=-3.0V, IOUT=0mA/10mA) |
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±9.0% (VIN=5.0V, CIN=CP=COUT=4.7µF, Set Output Voltage=-3.0V, IOUT=50mA) |
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Output Voltage...................... |
Stepwise setting with a step of 0.1V in the range from -2.0V to -4.0V is possible. |
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Range of Input Voltage ......... |
VOUT V to +5.5V (Set Output Voltage=-4.0V to -2.8V) |
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+2.7V to +5.5V (Set Output Voltage=-2.7V to -2.0V) |
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Oscillator Frequency ............ |
TYP. 280kHz |
•Chip Enable Function (Active at “L”)
•Package ................................. TSSOP8
APPLICATIONS
•Power source for Disk Drives.
•Power source for hand-held communication equipment and battery-powered equipment.
•Power source for PC peripherals and ADD-ON cards.
•Power source for portable audio-visual appliances such as cameras.
•Local power source for small electrical appliances.
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R1250V××1A
BLOCK DIAGRAM
CP+ CP-
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3 |
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SW1 |
SW3 |
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VIN |
8 |
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GND |
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RO |
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SW2 |
SW4 |
VOUT |
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7 |
OSC |
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RPU |
CE |
4 |
Vref |
6 |
Vref |
PIN CONFIGURATION
TSSOP8
CP+ |
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8 |
VIN |
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GND |
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7 |
VOUT |
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CP- |
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6 |
Vref |
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NC |
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CE |
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4 |
5 |
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PACKAGE DIMENSION
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8 |
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5 |
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R1250V××1A |
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PIN DESCRIPTION |
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Pin No. |
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Symbol |
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Description |
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CP+ |
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CP (Capacitor for Charge Pump) Positive Power Supply Pin |
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GND |
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Ground Pin |
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3 |
CP- |
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CP (Capacitor for Charge Pump) Negative Power Supply Pin |
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Chip Enable Pin (active at “L”) |
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CE |
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NC |
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No Connection Pin |
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6 |
Vref |
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Output Pin for Reference Voltage (*Note1) |
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7 |
VOUT |
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Output Pin for Negative Regulator |
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8 |
VIN |
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Power Supply Pin |
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*Note1 Vref is just a monitoring pin, therefore remain open. Do not connect any load. Refer to Techni- |
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cal Notes. |
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ABSOLUTE MAXIMUM RATINGS |
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(GND=0V) |
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Symbol |
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Item |
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Rating |
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Unit |
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VIN |
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VIN Supply Voltage |
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-0.3 to 7.5 |
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V |
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VCE |
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Pin Input Voltage |
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-0.3 to VIN+0.3 |
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V |
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CE |
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VP+ |
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CP+ Pin Input Voltage |
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-0.3 to VIN+0.3 |
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V |
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Vref |
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Vref Pin Voltage |
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-0.3 to VIN+0.3 |
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V |
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VP- |
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CP- Pin Input Voltage |
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VIN-12 to +0.3 |
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V |
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VOUT |
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VOUT Pin Voltage |
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VIN-12 to +0.3 |
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V |
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IOUT |
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Output Current |
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200 |
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mA |
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PD |
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Power Dissipation*NOTE1 |
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490 |
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mW |
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Topt |
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Operating Temperature Range |
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-40 to +85 |
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°C |
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Tstg |
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Storage Temperature Range |
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-55 to +125 |
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°C |
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*Note1: Power dissipation is specified under the specified condition. |
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Conditions; |
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Evaluation Board Dimensions: 50mm × 50mm × 1.6mm |
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Material: Glass Epoxy (FR-4) |
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Reverse side of the evaluation board: Plane Copper |
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Surface of the evaluation board: Land pattern and Wiring |
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3
R1250V××1A
SELECTION GUIDE
The output voltage and the active type for the ICs can be selected at the user’s request. The selection can be made with designating the part number as shown below;
R1250V××1A-××
↑ ↑ ↑
a b c
Code |
Contents |
Setting Output Voltage
a××: The absolute value of Output Voltage
Stepwise setting with a step of 0.1V in the range of -2.0V to -4.0V is possible.
b
Designation of Active Type of the Chip Enable Circuit:
A (fixed) : “L” active type
c
Designation of Packing Type
E2 : E2 1reel=2000pcs
4
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