RICOH R1250V××1A Technical data
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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 out-
put 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 cur-
rent.
Since the package for this IC is TSSOP8 package (TSOP8 in EIAJ standard), high density mounting of the ICs on
board is possible.
FEATURES
• Output Current..................... 100mA (MAX. at V
• Output Voltage Accuracy...... ±3.0% (V
±9.0% (V
IN
=5.0V, CIN=CP=C
IN
=5.0V, CIN=CP=C
IN
=5.0V, CIN=CP=C
OUT
OUT
• Output Voltage...................... Stepwise setting with a step of 0.1V in the range from -2.0V to -4.0V is possible.
OUT
• Range of Input Voltage......... V
V to +5.5V (Set Output Voltage=-4.0V to -2.8V)
+2.7V to +5.5V (Set Output Voltage=-2.7V to -2.0V)
• Oscillator Frequency ............ TYP. 280kHz
• Chip Enable Function (Active at “L”)
• Package ................................. TSSOP8
OUT
=4.7µF, Set Output Voltage=-3.0V)
=4.7µF, Set Output Voltage=-3.0V, I
=4.7µF, Set Output Voltage=-3.0V, I
OUT
=0mA/10mA)
OUT
=50mA)
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.
1
R1250V××1A
BLOCK DIAGRAM
C
P+
C
P-
13
8
V
IN
SW2
SW1 SW3
R
PU
4
CE
PIN CONFIGURATION
OSC
2
GND
R
SW4
Vref Vref
O
7
V
OUT
6
TSSOP8
8
P+
1
C
V
IN
PACKAGE DIMENSION
GND
C
CE
2
3
P
-
4
1
2
3
4
7
6
5
OUT
V
Vref
NC
8
7
6
5
2
PIN DESCRIPTION
R1250V××1A
Pin No.
1C
Symbol Description
P+
CP (Capacitor for Charge Pump) Positive Power Supply Pin
2 GND Ground Pin
3C
4
P-
——
CE
CP (Capacitor for Charge Pump) Negative Power Supply Pin
Chip Enable Pin (active at “L”)
5 NC No Connection Pin
6 Vref Output Pin for Reference Voltage
7V
8V
OUT
IN
Output Pin for Negative Regulator
Power Supply Pin
*Note1 Vref is just a monitoring pin, therefore remain open. Do not connect any load. Refer to Techni-
cal Notes.
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
IN
V
CE
V
VIN Supply Voltage -0.3 to 7.5 V
——
CE Pin Input Voltage
(*Note1)
-0.3 to V
(GND=0V)
IN
+0.3 V
P+
V
CP+ Pin Input Voltage -0.3 to VIN+0.3 V
Vref Vref Pin Voltage -0.3 to VIN+0.3 V
P-
V
OUT
V
OUT
I
D
P
CP- Pin Input Voltage VIN-12 to +0.3 V
OUT
V
Pin Voltage VIN-12 to +0.3 V
Output Current 200 mA
Power Dissipation
*NOTE1
490 mW
Topt Operating Temperature Range -40 to +85 °C
Tstg Storage Temperature Range -55 to +125 °C
*Note1: Power dissipation is specified under the specified condition.
Conditions;
Evaluation Board Dimensions: 50mm × 50mm × 1.6mm
Material: Glass Epoxy (FR-4)
Reverse side of the evaluation board: Plane Copper
Surface of the evaluation board: Land pattern and Wiring
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-××
↑↑↑
abc
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
c
Designation of Active Type of the Chip Enable Circuit:
A (fixed) : “L” active type
Designation of Packing Type
E2 : E2 1reel=2000pcs
4
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