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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
R1250V××1A
ELECTRICAL CHARACTERISTICS
R1250V××1A (Unless otherwise provided, VIN
=5.0V, Topt=25°C, CP, C
Symbol Item Conditions MIN. TYP. MAX. Unit
OUT
= Ceramic 4.7µF)
IN
V
I
STB
I
OUT
V
Operating Input Voltage
SS
Supply Current
Shut-down Current
Output Voltage
Vref Reference Voltage
*Note3
Set Output Voltage = -2.7V to -2.0V 2.7
OUT
Set Output Voltage = -4.0V to -2.8V |Set V
|
-2.4V to -2.0V 1.50 2.30
Operation: Active,
for IC itself
*Note1
-2.9V to -2.5V 1.60 2.55
-3.4V to -3.0V 1.70 2.75
-4.0V to -3.5V 1.80 3.00
Operation: Shut-down, for IC
*Note2
itself
0.1 1 µA
-2.4V to -2.0V ×0.95 ×1.05
-2.9V to -2.5V ×0.96 ×1.04
OUT
I
=0mA/10mA
-3.4V to -3.0V ×0.97 ×1.03
-4.0V to -3.5V ×0.97 ×1.03
OUT
I
=50mA -2.4V to -2.0V ×0.88 ×1.12
-2.9V to -2.5V ×0.89 ×1.11
I
OUT
=75mA
-3.4V to -3.0V ×0.91 ×1.09
-4.0V to -3.5V ×0.92 ×1.08
OUT
No load V
V
5.5 V
mA
V
OUT
I
∆V
∆I
OUT
/
Load Regulation
OUT
=10mA to 50mA -2.4V to -2.0V
OUT
I
=10mA to 75mA -4.0V to -2.5V
0.7
fosc Oscillator Frequency Output Frequency 238 280 322 kHz
∆fosc/∆T
Oscillator Frequency
±0.25
Temperature Coefficient
Duty Oscillator Duty Cycle At no Load 50 %
SDH
V
SDL
V
R
R
*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.
CE “H” Input Voltage 1.5 V
CE “L” Input Voltage 0.25 V
PU
CE Pull-up Resistance 0.68 1.25 3.00 MΩ
Resistance between
O
OUT
V
and GND
5kΩ
mV/
mA
kHz/
°C
5
R1250V××1A
TYPICAL CHARACTERISTICS
1) Supply Current at no load vs. Input Voltage 2) Supply Current at no load vs. Temperature
2.500
(mA)
2.000
SS2
1.500
R1250V××
-3.0V Output
××1A R1250V××
××××
-4.0V Output
(mA)
SS2
2.5
-4.0V Output
2.0
1.5
××1A
××××
1.000
-2.0V Output
0.500
Supply Current at no load I
0.000
2.5 3.0
Input Voltage V
4.0 5.04.5 5.53.5
IN
(V)
1.0
-2.0V Output
0.5
Supply Current at no load I
0.0
-50 -25
Temperature Topt (°C)
3) Input Current vs. Output Load Current 4) Efficiency vs. Load Current
120
100
80
(mA)
IN
60
40
Input Current I
20
0
0 20 60 10080 12040
R1250V301A R1250V××
100
80
60
-2.0V Output
40
Efficiency η (%)
Output Load Current I
OUT
20
0
020
(mA)
VIN=lOutputl+1V
Output Load Current I
××1A
××××
-3.0V Output
25 7550 1000
-4.0V Output
-3.0V Output
60 10080 12040
OUT
(mA)
5) Oscillator Frequency vs. Input Voltage 6) Oscillator Frequency vs. Temperature
R1250V201A R1250V201A
320
310
300
290
280
270
260
250
Oscillator Frequency fosc (kHz)
240
2.5 3 4 54.5 5.53.5
Input Voltage V
IN
(V)
300
298
296
294
292
290
288
286
284
Oscillator Frequency fosc (kHz)
282
280
-50 -25 25 7550 1000
Temperature Topt (°C)
6
7) Output Voltage vs. Output Load Current
R1250V201A R1250V201A
-1.9
R1250V××1A
-1.5
(V)
OUT
-2
Output Voltage V
-2.1
0 20 60 10080 12040
-2.9
(V)
OUT
-3
Output Voltage V
85°C50°C25°C
VIN=5.0V
(V)
OUT
-1.6
-1.7
-1.8
-1.9
-2
85°C
50°C
25°C
Output Voltage V
-2.1
-2.2
0 20 60 10080 12040
OUT
Output Load Current I
(mA)
Output Load Current I
R1250V301A R1250V301A
-2.5
-2.6
-2.7
(V)
OUT
25°C
-2.8
VIN=5.0V
85°C50°C
-2.9
-3
Output Voltage V
-3.1
25°C
50°C
85°C
OUT
VIN=4.0V
VIN=3.0V
(mA)
-3.1
0 20 60 10080 12040
-3.5
-3.6
-3.7
(V)
OUT
-3.8
-3.9
-4
Output Voltage V
-4.1
-4.2
0 20 60 10080 12040
Output Load Current I
OUT
R1250V401A
85°C
50°C
25°C
Output Voltage Load Current I
(mA)
VIN=5.0V
OUT
(mA)
-3.2
0 20 60 10080 12040
Output Load Current I
OUT
(mA)
7
R1250V××1A
8) Output Voltage vs. Temperature
R1250V201A R1250V301A
-1.98
-1.99
(V)
OUT
-2.00
-2.01
Output Voltage V
-2.99
-3.00
-3.01
-3.02
-3.03
Output Voltage VOUT (V)
-3.03
-2.02
-50 -25 25 7550 1000
Temperature Topt (°C)
R1250V401A
-3.98
-3.99
-4.00
(V)
OUT
-4.01
-4.02
-4.03
-4.04
Output Voltage V
-4.05
-4.06
-50 -25 25 7550 1000
Temperature Topt (°C)
9) Output Voltage Waveform
100mV
-3.00V
-3.05
-50 -25 25 7550 1000
Temperature Topt (°C)
Unless otherwise provided, conditions are as follows;
Sample: R1250V301A
IN
V
=5.0V
IN=CP=COUT
C
I
OUT
=0mA
=4.7µF
BW=20MHz
1.00µs
8
100mV
1.00µs
-3.00V
-3.00V
I
I
OUT
OUT
R1250V××1A
=10mA
=50mA
100mV
1.00µs
TEST CIRCUITS
Test Circuit 1) Supply Current 1
Test Circuit 2) Typical Characteristics 1), 2)
Test Circuit 3) Typical Characteristics 3), 4), 7), 8)
Test Circuit 4) Typical Characteristics 5), 6)
Test Circuit 5) Typical Characteristics 9)
Test Circuit 6) Standby Current
1) Test Circuit 1
8.V
P+
1.C
2.GND
3.C
P
-
4.CE
IN
7.V
OUT
6.Vref
5.NC
SS
-P
I
I
SS
-N
A
Set Output Voltage+0.2V
A
5.5V
<Definition> I
SS1=ISS
-P+ISS-N
(*) To stabilize voltage, a few µF bypass capacitors are applied to V
OUT pin and VIN pin.
9
R1250V××1A
2) Test Circuit 2
1.C
P+
8.V
I
SS2
IN
4.7µF
3) Test Circuit 3
4.7µF
<Definition> η (|V
OUT
|×I
OUT
)/(V
2.GND
3.C
4.CE
1.C
2.GND
3.C
4.CE
IN×IIN
P-
P+
P-
)×100(%)
7.V
OUT
6.Vref
5.NC
8.V
IN
OUT
7.V
6.Vref
5.NC
4.7µF
4.7µF
A
4.7µF
I
IN
A
I
OUT
V
4.7µF
4) Test Circuit 4
P+
P-
8.V
IN
OUT
7.V
6.Vref
5.NC
Oscilloscope
1.C
2.GND
3.C
4.CE
(*) To stabilize voltage, a few µF bypass capacitor is applied to VIN pin.
10
5) Test Circuit 5
1.C
P+
8.V
R1250V××1A
I
IN
IN
4.7µF
6) Test Circuit 6
2.GND
3.C
P-
4.CE
7.V
OUT
6.Vref
5.NC
1.C
P+
2.GND
3.C
P-
4.CE
8.V
IN
OUT
7.V
6.Vref
5.NC
4.7µF
I
OUT
Oscilloscope
4.7µF
A
7.5V
A
5.0V
BW:20MHz
TYPICAL APPLICATION
C
P+
P
C
4.7µF
(*) Vref pin should not be wired. Refer to Technical Notes.
GND
C
P-
CE
IN
V
OUT
V
Vref
NC
Open
C
IN
4.7µF
Output
C
OUT
4.7µF
11
R1250V××1A
OPERATION
1) Basic Operation
The R1250V××1A Series make SW1 through SW4 ON and OFF by the clock generated by internal oscillator (OSC)
with fixed frequency, and operate as a inverting charge pump with the capacitor C
P
and the capacitor C
The Output Voltage is feedback and the voltage between the Output Voltage and Reference Voltage (Vref =V
V) is divided half, and it is compared with the GND (=0V) level by an internal operational amplifier.
By this action, the impedance of SW3 is controlled to correspond with its load current and Output Voltage keeps
“Set V
OUT
” level.
2) Status of Internal Circuits at Standby mode and Standby Current
At Standby mode, R1250V Series keep the voltage of C
V
IN
C
IN
C
P
P
as shown below:
R
O
R
OUT
C
OUT
up to 5kΩ
OUT
.
OUT
V
OUT
R1250V××1A
When you design a system with using this IC, consider the following subjects;
2-(1) If very small leakage current would be a critical, the leakage current of both C
2-(2) Because the voltage level of C
P
keeps as much as VDD level, the speed for start-up from stand-by mode is faster
IN
and CP should be considered.
than the start-up by power-on.
2-(3) V
OUT
is internally pulled down through 5kΩ to GND. Time constant “τ” of transient response (turn-off speed) of
OUT
V
can be calculated as follows:
τ ≅ (5[kΩ] R
OUT
) × C
OUT
OUT
(R
: Output load resistance)
2-(4) Load current should be OFF synchronously with this IC if the load is electronic or connected between V
OUT
V
. If some charge is continuously flown to the Output V
OUT
at the “OFF” state, the voltage level of V
rise and could be beyond 0V. And if the voltage will be +0.3V (that is designated as absolute maximum rating.),
this IC might be break down.
3) Ripple Voltage
Ripple voltage of Output waveform can be roughly calculated as follows:
/ C
OUT
[mA] + Supply Current at no load [mA]) / (Oscillator Frequency: 280000 [Hz])
OUT
[F]
Vripple [mVp-p] ≅ 0.5× (I
Supply Current at no load [mA] ≅ Supply Current 1 [mA]
OUT
IN
and
will
12
4) Power Consumption
Power Consumption at large load current of this IC can be calculated as follows:
Wchip [mW] ≅ (V
IN
[V]-| Set Output Voltage |) × (I
OUT
[mA])
TECHNICAL NOTES
To use this IC, the following things should be considered.
1) Short Protection function for each pin is not included in this IC.
2) Use capacitors with low equivalent series resistor (ESR) for C
IN
this IC’s performance worse.
3) Make wiring of GND, V
IN
, CP+, CP- secure enough and decrease impedance. High impedance could be a cause of
unstable operation of this IC.
4) When this IC is used with large load current, consider its radiation of heat.
5) Basically, Vref pin can be used for soldering to the mount pad of PCB. Do not make it wiring.
6) Load type is electronic or setting between V
IC, make sure not to raise V
OUT
level on positive voltage side. If the voltage level is beyond +0.3V, which is desig-
IN
and V
OUT
, in cases of OFF-state of this IC and start-up state of this
nated as the absolute maximum rating, this IC could be broken.
, CP, C
OUT
pins. Capacitors with large ESR make
R1250V××1A
13
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