Negative Output Charge Pump Regulator
59[[$ 6(5,(6
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NO. EA-076-0204
OUTLINE
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R1250Vxx1A
2
BLOCK DIAGRAM
V
IN
V
OUT
1
3
2
7
6
SW1
SW3
SW4
SW2
8
4
GND
CE
R
O
R
PU
OSC
Vref
Vref
C
P+
C
P-
PIN CONFIGURATION
TSSOP8
1
3
2
4
C
P+
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P
-
GND
CE
8
6
7
5
V
IN
Vref
V
OUT
NC
PACKAGE DIMENSION
1
2
3
4
8
7
6
5
R1250Vxx1A
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PIN DESCRIPTION
Pin No.
Symbol
Description
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*Note1
Vref is just a monitoring pin, therefore remain open. Do not connect any load. Refer to Techni-
cal Notes.
ABSOLUTE MAXIMUM RATINGS
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Unit
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*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
R1250Vxx1A
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SELECTION GUIDE
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Contents
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R1250Vxx1A
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ELECTRICAL CHARACTERISTICS
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Item
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Min.
Typ.
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Unit
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*Note1
Refer to Test Circuit 1.
*Note2:
Refer to Test Circuit 6.
*Note3:
Do not connect ant load. Refer to Technical Notes.
*Use Ceramic Capacitors with low ESR. Capacitors with high ESR could have bad effect on the performance of this IC.
R1250Vxx1A
6
TYPICAL CHARACTERISTICS
1)
Supply Current at no load vs. Input Voltage
2)
Supply Current at no load vs. Temperature
R1250Vxx1A
R1250Vxx1A
2.000
2.500
1.500
1.000
0.500
0.000
Input Voltage V
IN
(V)
2.5
3.0
-3.0V Output
-2.0V Output
-4.0V Output
4.0
5.0
4.5
5.5
3.5
Supply Current at no load I
SS2
(mA)
2.0
2.5
1.5
1.0
0.5
0.0
Temperature Topt (
C)
-50
-25
-3.0V Output
-2.0V Output
-4.0V Output
25
75
50
100
0
Supply Current at no load I
SS2
(mA)
3)
Input Current vs. Output Load Current
4)
Efficiency vs. Load Current
R1250V301A
R1250Vxx1A
100
120
80
60
40
20
0
Output Load Current I
OUT
(mA)
0
20
60
100
80
120
40
Input Current I
IN
(mA)
80
100
60
40
20
0
0
20
-3.0V Output
-2.0V Output
-4.0V Output
V
IN
=lOutputl+1V
60
100
80
120
40
Efficiency
(%)
Output Load Current I
OUT
(mA)
5)
Oscillator Frequency vs. Input Voltage
6)
Oscillator Frequency vs. Temperature
R1250V201A
R1250V201A
310
300
320
290
280
270
260
250
240
Input Voltage V
IN
(V)
2.5
3
4
5
4.5
5.5
3.5
Oscillator F
requency f
osc (kHz)
Temperature Topt (
C)
298
296
294
300
292
290
288
286
284
282
280
-50
-25
25
75
50
100
0
Oscillator F
requency f
osc (kHz)
R1250Vxx1A
7
7)
Output Voltage vs. Output Load Current
R1250V201A
R1250V201A
-1.9
-2
-2.1
Output Load Current I
OUT
(mA)
0
20
60
100
80
120
40
Output V
oltage V
OUT
(V)
V
IN
=5.0V
85
C
50
C
25
C
Output Load Current I
OUT
(mA)
Output V
oltage V
OUT
(V)
85
C
50
C
25
C
V
IN
=3.0V
-1.6
-1.7
-1.5
-1.8
-1.9
-2
-2.1
-2.2
0
20
60
100
80
120
40
R1250V301A
R1250V301A
-2.9
-3
-3.1
Output Load Current I
OUT
(mA)
0
20
60
100
80
120
40
Output V
oltage V
OUT
(V)
85
C
50
C
25
C
V
IN
=5.0V
Output Load Current I
OUT
(mA)
Output V
oltage V
OUT
(V)
85
C
50
C
25
C
V
IN
=4.0V
-2.6
-2.7
-2.5
-2.8
-2.9
-3
-3.1
-3.2
0
20
60
100
80
120
40
R1250V301A
Output Voltage Load Current I
OUT
(mA)
Output V
oltage V
OUT
(V)
85
C
50
C
25
C
V
IN
=5.0V
-3.6
-3.7
-3.5
-3.8
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-4
-4.1
-4.2
0
20
60
100
80
120
40
R1250Vxx1A
8
8)
Output Voltage vs. Temperature
R1250V201A
R1250V301A
-1.99
-1.98
-2.00
-2.01
-2.02
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Output V
oltage V
OUT
(V)
-3.05
-3.03
-3.03
-3.02
-3.01
-3.00
-2.99
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Output V
oltage V
OUT
(V)
R1250V401A
-4.06
-4.05
-4.04
-4.03
-4.02
-4.01
-4.00
-3.99
-3.98
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Output V
oltage V
OUT
(V)
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Output Voltage Waveform
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100mV
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TEST CIRCUITS
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Test Circuit 1
A
A
5.5V
I
SS
-P
I
SS
-N
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P+
3.C
P
-
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6.Vref
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OUT
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IN
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10
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Test Circuit 2
A
4.7
F
4.7
F
4.7
F
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P+
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P-
2.GND
4.CE
8.V
IN
6.Vref
7.V
OUT
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SS2
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Test Circuit 3
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A
4.7
F
4.7
F
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F
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P+
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2.GND
4.CE
8.V
IN
6.Vref
7.V
OUT
5.NC
Oscilloscope
(*)
To stabilize voltage, a few F bypass capacitor is applied to V
IN
pin.
R1250Vxx1A
11
5)
Test Circuit 5
A
4.7
F
4.7
F
4.7
F
1.C
P+
3.C
P-
2.GND
4.CE
8.V
IN
6.Vref
7.V
OUT
5.NC
I
IN
I
OUT
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5.0V
6)
Test Circuit 6
A
7.5V
1.C
P+
3.C
P-
2.GND
4.CE
8.V
IN
6.Vref
7.V
OUT
5.NC
TYPICAL APPLICATION
4.7
F
4.7
F
Output
C
P+
C
P-
GND
CE
V
IN
Vref
V
OUT
NC
Open
C
P
C
IN
C
OUT
4.7
F
(*)
Vref pin should not be wired. Refer to Technical Notes.
R1250Vxx1A
12
OPERATION
1)
Basic Operation
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