Download XC6901/XC6902 Series

High
g Speed
p
Negative
g
Voltage
g Regulators
g
New Product Release
XC6901/XC6902 Series
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The XC6901/XC6902 series of high speed negative voltage regulators
have an output current of 200mA, are compatible with low ESR capacitors, and have an output accuracy of ±1.5%. The XC6901 series has a
CE pin that enables direct positive voltage control from a microcomputer. Soft-start and CL discharge functions are included.
The XC6902 series are 3-pin regulators th at enable the output voltage
to be set in steps of 0.1V within the range -0.9V to -12V.
These regulators can be used as a power supply for CCD systems and
as a negative-voltage bias power supply for LCD modules and other
devices.
1
The XC6901 enables direct ON/OFF control
from a microcomputer
USP-6C䇭䇭
SOT-25䇭
SOT-89-5䇭
USP-6C䇭䇭䇭䇭SOT-23䇭䇭䇭䇭䇭 SOT-89
Negative voltage with same high-speed response
as positive voltage
2
䇼Load Transient Response䇽
GND
1㱘F
1 㱘F
-VOUT
Negative Voltage
Power Supply
-5V
XC6901
-12V
-VIN
Output Voltage -VOUT(V)
Microcomputer
CIN=CL=1㱘F(ceramic),VIN=-7V,VCE=1.5V,tr=tf=5㱘s
㪄㪌㪅㪏
㪄㪌㪅㪐
㪊㪇㪇
㪉㪌㪇
120mV
㪄㪍
㪉㪇㪇
120mV
㪄㪍㪅㪈
㪈㪌㪇
CE
㪈㪇㪇㫄㪘
+
The CE pin enables direct ON/OFF
control from the positive voltage of a
microcomputer. Up to 3.6V can be
input into the CE pin.
㪄㪍㪅㪉
㪈㪇㪇
㪄㪍㪅㪊
㪌㪇
㪈㫄㪘
㪄㪍㪅㪋
CE
㪇
3.3V
Output Current IOUT(mA)
3.3V
Time (500 㱘s/div)
GND
High speed transient response as fast as a positive voltage
high speed LDO. Rise and fall are held to a small change
of 120mV.
-5.0V
−VOUT
−
Soft-start
Features
XC6901 Series / −2.4V䌾−12.4V䋨VCE=3.6V䋩
Low Power Consumption
100μA
XC6902 Series / −2.4V䌾−16.0V
High Ripple Rejection
50dB @1kHz
-1.2V, -2.5V, -2.6V, -3.0V, -3.3V
CE Function (XC6901)
Output Voltage Accuracy
-4.0V, -4.5V, -5.0V, -6.0V, -12.0V
±1.5䋦䋨VOUT䋼−2.0V䋩
Protection Circuits
CE Threshold Voltage + Over 1.2V
CLHigh Speed Discharge, Soft-start
Current Limit 䋨350mA, TYP.䋩
Temperature Stability
Dropout Voltage
±0.03V䋨−VOUT㻢−2.0V䋩
±50ppm / 㷄
400mV @ IOUT =100mA @ VOUT = - 5V
Input Voltage Range
Output Voltage Range
(Standard Voltage)
Packages
Thermal Shutdown
XC6901 USP-6C, SOT-25, SOT-89-5
XC6902䇭 USP-6C, SOT-23, SOT-89
www.torex.co.jp/english/ August 2011
䃂 Values shown in this sheet can be changed without any prior notice.
New Product Release
High Speed Negative Voltage Regulators䇭XC6901/XC6902 Series
3
Positive/negative power supply solves power startup problems in mixed circuits
䇼Output Voltage vs. Output Current䇽
Negative voltage is
drawn into the
positive voltage side
㪚㪠㪥
㪭㪦㪬㪫
XC6701
㽲 Current limitation
characteristics of XC6901
㪈
(Positive Voltage VR)
㪚㪣
㪞㪥㪛
Load
㪚㪠㪥
VIN=-6.0V, Ta=25㷄, CIN=CL=1㱘F(ceramic)
㪉
㪞㪥㪛
Output Voltage : -VOUT(V)
㪭㪠㪥
㽲
㽳
㪚㪣
㪇
㪄㪈
㪄㪉
㽳 Current limitation
characteristics of regular
regulators
㪄㪊
㪄㪋
㪄㪌
XC6902
㪄㪭㪠㪥
㪄㪍
㪄㪭㪦㪬㪫
㪇
㪌㪇
㪈㪇㪇
㪈㪌㪇
㪉㪇㪇
㪉㪌㪇
㪊㪇㪇
㪊㪌㪇
㪋㪇㪇
Output Current : IOUT(mA)
In cases where a mixed positive/negative power supply circuit combines a positive voltage regulator and a negative voltage regulator like
that shown in the circuit example above, it may happen that the regulator output voltage cannot start when the power supply starts.
This problem is due to the startup sequence (timing) of the positive/negative power supplies and the current limitation characteristics
incorporated in the regulators. The problem occurs in regulators that have the current limitation characteristics indicated in 㽳 of the above
graph, and the cause of the problem is the fact that the positive power supply side starts first, and current continues to be drawn into the
positive voltage side after the negative voltage side starts.
As shown in 㽲 of the above graph, the XC6901/XC6902 series solves this problem by means of a circuit configuration where the current
limitation characteristic does not have a stable point at 0mA. This circuit innovation solves power startup problems and enables the supply
of good positive/negative power without affecting the positive/negative power startup sequence.
4
Comparison with the previous XC62KN product
XC6901/XC6902
6902 Series
Advantage
XC62KN Series
−VIN
High Voltage
High Speed
Load Transient Response
䃂Good transient response characteristics
䃂Wide usable range (see graph at right)
䃂Good temperature characteristics
䃂Compatible with low ESR capacitors
䃂Full set of protective functions䋨Foldback, TSD䋩
䃂Soft-start
䇭 CL Discharge (XC6901)
䇼Comparison of operable ranges of
negative voltage regulators䇽
Low Power
Consumption
−16V
Advantage
䃂Low Power Consumption 3μA
XC6902 Series
−16V+VCE
XC6901 Series
−10V
VS
XC62KN Series
Disadvantage
Disadvantage
䃂Higher supply current than XC62KN
䃂Inferior transient response characteristics
䃂Not compatible with low ESR capacitors
−2.4V
−2.1V
100mA
200mA
IOUT
The operating range of the XC6901
is -2.4V to -12.4V (VCE=3.6V)
www.torex.co.jp/english/ August 2011
䃂 Values shown in this sheet can be changed without any prior notice.