R1250V4.01A- [ETC]
Analog IC ; 模拟IC\n
| 型号： | R1250V4.01A- |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总13页 (文件大小：129K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2000.5.25
Negative Output Charge Pump Regulator (100mA)
12345
n OUTLINE
R1250VXX1A
The R1250Vxx1A Series are Negative Output Charge Pump Regulator ICs which can be developed as a
controller of local power supply 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, an output
driver circuit. The R1250Vxx1A can be easily supply negative voltage, or regulated setting output voltage in the range
from –2V to –4V.
The chip enable function works to shut down the internal circuit and reduces supply current at the stand-by mode,
therefore the R1250Vxx1A 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.
n FEATURES
OOutput Current · · · · · · · · · · · · · · · · · · 100mA (MAX. at VIN=5.0V, CIN=CP=COUT=4.7mF,
Set Output Voltage=-3.0V)
OOutput Voltage Accuracy · ·±3.0%(VIN=5.0V, CIN=CP=COUT=4.7mF, Set Output Voltage=-3.0V, IOUT=0mA/10mA)
±9.0%(VIN=5.0V, CIN=CP=COUT=4.7mF, Set Output Voltage=-3.0V, IOUT=50mA)
OOutput Voltage · · · · · · · · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range from –2.0V
to –4.0V is possible.
ORange of Input Voltage · · · · · · · · · · · · · ½VOUT½ to +5.5V(Set Output Voltage=-4.0V to -2.8V)
+2.7 to +5.5V(Set Output Voltage=-2.7V to –2.0V)
OOscillator Frequency· · · · · · · · · · · · · · · TYP. 280kHz
OChip Enable Function (Active at "L")
OPackage · · · · · · · · · · · · · · · · · · · · · TSSOP8
n APPLICATIONS
OPower source for Disk Drives.
OPower source for hand-held communication equipment and battery-powered equipment.
OPower source for PC peripherals and ADD-ON cards.
OPower source for portable audio-visual appliances such as cameras.
OLocal power source for small electrical appliances.
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Rev. 1.10
- 1 -
n BLOCK DIAGRAM
P
C +
C -
P
3
1
SW1
SW2
SW3
SW4
VIN 8
2 GND
7
Ro
OUT
V
OSC
RPU
CE
4
6
REF
V
V
REF
n PIN CONFIGURATION
l TSSOP8
8
1
2
CP+
VIN
VOUT
7
6
GND
CP-
3
4
VREF
5
N.C.
CE or CE
n PACKAGE DIMENSION
TSOP8 0.65mm-pitch
0.65
3.0 (TYP.)
4.4 (TYP.)
6.4
Thickness 1.1 (MAX.)
(Unit: mm )
(TYP.)
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Rev. 1.10
- 2 -
n PIN DESCRIPTION
Pin No.
Symbol
Description
1
2
3
4
5
6
7
8
C
C (Capacitor for Charge Pump) Positive Power Supply Pin
P+
P
GND
Ground Pin
C -
C (Capacitor for Charge Pump) Negative Power Supply Pin
P
P
CE
NC
Chip Enable Pin (active at “L”)
No Connection Pin
V
REF
Output Pin for Reference Voltage(*Note1)
Output Pin for Negative Regulator
Power Supply Pin
V
OUT
V
IN
*Note1 V
REF is just a monitoring pin, therefore remain open. Do not connect any load. Refer to Technical Notes.
QABSOLUTE MAXIMUM RATINGS
(GND=0V)
Symbol
Item
Supply Voltage
IN
Rating
Unit
V
V
IN
V
-0.3 to 7.5
V
CE
CE Pin Input Voltage
-0.3 to V +0.3
V
IN
V
P+
C
Pin Input Voltage
-0.3 to V +0.3
V
P+
IN
V
REF
V
REF
Pin Voltage
-0.3 to V +0.3
V
IN
V
P-
C
Pin Input Voltage
V -12 to +0.3
IN
V
P-
V
V
Pin Voltage
V -12 to +0.3
V
OUT
OUT
OUT
IN
I
Output Current
200
490
mA
mW
Cq
P
Power Dissipation*NOTE1
Operating Temperature Range
Storage Temperature Range
D
Topt
-40 to +85
-55 to +125
Tstg
Cq
*Note1: Power dissipation is specified under our 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
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Rev. 1.10
- 3 -
SELECTION GUIDE
n
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-
55
55
• • •
a b c
Code
Contents
a
Setting Output Voltage
xx : 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
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Rev. 1.10
- 4 -
n ELECTRICAL CHARACTERISTICS
lR1250Vxx1A
(Unless otherwise provided, VIN=5.0V, Topt=25°C, CP, COUT = Ceramic 4.7mF)
Symbol
Item
Conditions
MIN.
2.7
TYP.
MAX.
5.5
Unit
V
V
IN
Operating Input Voltage Set Output Voltage = –2.7V to –2.0V
Set Output Voltage = -4.0V to –2.8V S_et V
OUT
Iss
Supply Current
Operation: Active, -2.4V to –2.0V
1.50
1.60
1.70
1.80
0.1
2.30
2.55
2.75
3.00
1
mA
for IC itself*Note1
-2.9V to –2.5V
-3.4V to –3.0V
-4.0V to –3.5V
I
Shut-down Current
Output Voltage
Operation: Shut-down, for IC itself*Note2
AP
STB
V
OUT
I
=0mA/10mA -2.4V to –2.0V
-2.9V to –2.5V
0u.95
1u.05
1u.04
1u.03
1u.03
1u.12
1u.11
1u.09
1u.08
V
OUT
0u.96
0u.97
0u.97
0u.88
0u.89
0u.91
0u.92
-3.4V to –3.0V
-4.0V to –3.5V
I
I
=50mA
=75mA
-2.4V to –2.0V
-2.9V to –2.5V
-3.4V to –3.0V
-4.0V to –3.5V
OUT
OUT
V
Reference Voltage(Note No load
3)
Load Regulation
~V
V
REF
OUT½
'V
/
I
I
=10mA to 50mA -2.4V to –2.0V
=10mA to 75mA -4.0V to –2.5V
0.7
mV/mA
OUT
OUT
'I
OUT
OUT
fosc
Oscillator Frequency
Output Frequency
238
280
322
kHz
'f
/ Oscillator Frequency
Temperature Coefficient
Oscillator Duty Cycle
CE “H” Input Voltage
CE “L” Input Voltage
CE Pull-up Resistance
Resistance between
0r.25
kHz/ Cq
OSC
'T
D
At no Load
50
%
V
UTY
V
SDH
1.5
V
SDL
0.25
3.00
V
R
0.68
1.25
5
M :
k :
PU
R
O
V
OUT
and GND
*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.
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Rev. 1.10
- 5 -
QTYPICAL CHARACTERISTICS
1)Supply Current at no load vs. Input Voltage
2)Supply Current at no load vs. Temperature
R1250VXX1A
R1250VXX1A
2.5
2.500
2.0
2.000
-4.0V Output
-4.0V Output
1.500
1.000
0.500
0.000
1.5
1.0
-3.0V Output
-2.0V Output
-2.0V Output
-3.0V Output
0.5
0.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-50
-25
0
25
50
75
100
Input Voltage VIN (V)
Temperature Topt(°C)
3) Input Current vs. Output Load Current
4) Efficiency vs. Load Current
R1250VXX1A
R1250V301A
120
100
80
60
40
20
0
-4.0V Output
100
80
60
40
20
0
-2.0V Output
-3.0V Output
VIN=|Output|+1 V
0
20
40
60
80
100
120
0
20
40
60
80
100
120
Output Load Current IOUT(mA)
Output Load Current IOUT (mA)
5) Oscillator Frequency vs. Input Voltage
6) Oscillator Frequency vs. Temperature
R1250V201A
R1250V201A
320
300
298
296
294
292
290
288
286
284
282
280
310
300
290
280
270
260
250
240
-50
-25
0
25
50
75
100
2.5
3
3.5
4
4.5
5
5.5
Input Voltage VIN (V)
Temperature Topt (°C)
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Rev. 1.10
- 6 -
7) Output Voltage vs. Output Load Current
R1250V201A
R1250V201A
-1.9
-1.5
-1.6
-1.7
-1.8
-1.9
-2
85°C
50°C
25°C
-2
VIN=5.0V
VIN=3.0V
25°C 50°C
85°C
-2.1
-2.2
-2.1
-2.9
0
20
40
60
80
100
120
0
20
40
60
80
100
120
Output Load Current IOUT[mA]
Output Load Current IOUT[mA]
R1250V301A
R1250V301A
-2.5
-2.6
-2.7
-2.8
-2.9
-3
85°C
50°C
25°C
-3
VIN=5.0V
25°C 50°C 85°C
VIN=4.0V
-3.1
-3.2
-3.1
0
20
40
60
80
100
120
0
20
40
60
80
100
120
Output Load Current IOUT[mA]
Output Load Current IOUT[mA]
R1250V401A
-3.5
-3.6
-3.7
-3.8
-3.9
-4
85°C
50°C
25°C
VIN=5.0V
-4.1
-4.2
0
20
40
60
80
100
120
Output Voltage Load Current IOUT[mA]
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Rev. 1.10
- 7 -
8)Output Voltage vs. Temperature
R1250V201A
R1250V301A
-1.98
-2.99
-3.00
-3.01
-3.02
-3.03
-3.04
-3.05
-1.99
-2.00
-2.01
-2.02
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt(°C)
Temperature Topt(°C)
R1250V401A
-3.98
-3.99
-4.00
-4.01
-4.02
-4.03
-4.04
-4.05
-4.06
-50
-25
0
25
50
75
100
Temperature Topt (°C)
9) Output Voltage Waveform
Unless otherwise provided, conditions are as follows;
Sample: R1250V301A
VIN=5.0V
CIN=CP=COUT=4.7mF
IOUT=0mA
BW=20MHz
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Rev. 1.10
- 8 -
IOUT=10mA
IOUT=50mA
QTEST 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
ISS-P
1.CP+
2.GND
3.CP-
8.VIN
A
7.VOUT
ISS-N
REF
6.V
A
5.NC
4.CE
5.5V
Set Output Voltage
+0.2V
<Definition> ISS1=ISS-P+ISS-N
(*) To stabilize voltage, a few mF bypass capacitors are applied to VOUT pin and VIN pin.
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Rev. 1.10
- 9 -
2) Test Circuit 2
ISS2
1.CP+
2.GND
3.CP-
4.CE
8.VIN
A
7.VOUT
m
4.7
F
6.V
REF
mF
4.7
m
F
4.7
5.NC
3) Test Circuit 3
IIN
1.CP+
8.VIN
A
7.VOUT
2.GND
3.CP-
V
6.VREF
5.NC
4.7 m F
4.7mF
4.CE
IOUT
<Definition> h(|VOUT|´IOUT)/(VIN´IIN)´100(%)
4) Test Circuit 4
1.CP+
8.VIN
7.VOUT
2.GND
Oscilloscope
3.CP-
6.VREF
5.NC
4.CE
(*) To stabilize voltage, a few mF bypass capacitor is applied to VIN pin.
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Rev. 1.10
- 10 -
5) Test Circuit 5
IIN
1.CP+
2.GND
3.CP-
8.VIN
7.VOUT
m
4.7 F
6.VREF
5.NC
5.0V
m
m
4.7
F
4.7 F
4.CE
OUT
I
BW : 20MHz
Oscilloscope
6) Test Circuit 6
1.CP+
8.VIN
A
7.VOUT
2.GND
3.CP-
6.VREF
5.NC
7.5V
4.CE
QTYPICAL APPLICATION
CIN
4.7 F
m
CP+
VIN
CP
OUTPUT
COUT
VOUT
VREF
GND
4.7 F
m
CP-
Open
4.7 F
m
NC
CE
(*) VREF pin should not be wired. Refer to Technical Notes.
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Rev. 1.10
- 11 -
n OPERATION
1) Basic Operation
The R1250Vxx1A 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 CP and the capacitor COUT.
The Output Voltage is feedback and the voltage between the Output Voltage and Reference Voltage (VREF
=½VOUT½ 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 VOUT” level.
2) Status of Internal Circuits at Standby mode and Standby Current
At Standby mode, R1250V Series keep the voltage of CP as shown below:
VIN
CIN
CP
COUT
VOUT
ROUT
up to 5kW
R1250V301
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 CIN and CP should be considered.
2-(2) Because the voltage level of CP keeps as much as VDD level, the speed for start-up from stand-by mode is faster
than the start-up by power-on.
2-(3) VOUT is internally pulled down through 5kW to GND. Time constant “t” of transient response (turn-off speed) of
VOUT can be calculated as follows:
t @ (5[kW] ½½ ROUT) ´ COUT (ROUT: Output load resistance)
2-(4) Load current should be OFF synchronously with this IC if the load is electronic or connected between VIN and
VOUT. If some charge is continuously flown to the Output VOUT at the “OFF” state, the voltage level of VOUT will 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:
Vripple [mVp-p] @ 0.5´ (IOUT [mA] + Supply Current at no load [mA]) / (Oscillator Frequency: 280000 [Hz]) / COUT [F]
Supply Current at no load [mA] @ Supply Current 1 [mA]
4) Power Consumption
Power Consumption at large load current of this IC can be calculated as follows:
Wchip[mW] @ (VIN[V]-| Set Output Voltage |) ´ (IOUT[mA])
n 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 CIN, CP, COUT pins. Capacitors with large ESR make
this IC’s performance worse.
3) Make wiring of GND, VIN, 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 VIN and VOUT, in cases of OFF-state of this IC and start-up state of this
IC, make sure not to raise VOUT level on positive voltage side. If the voltage level is beyond +0.3V, which is
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Rev. 1.10
- 12 -
designated as the absolute maximum rating, this IC could be broken.
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Rev. 1.10
- 13 -
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