RV5VH301-E1 [RICOH]
DC/DC CONVERTER CONTROLLER; DC / DC转换器控制器
| 型号： | RV5VH301-E1 |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | DC/DC CONVERTER CONTROLLER |
| 文件： | 总47页 (文件大小：382K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DC/DC CONVERTER
CONTROLLER
RV5VH SERIES
APPLICATION MANUAL
NO. EA-049-0006
DC/DC CONVERTER CONTROLLER
RV5VH SERIES
OUTLINE
Each of the RV5VH series is dual output CMOS DC/DC converter ICs integrating Step-up and inverting DC/DC convert-
ers.
The RV5VH3×× series ICs consists of an oscillator, two VFM control circuits, control transistors(EXT switches), a phase
shift circuit, a voltage reference unit, an error amplifier, and voltage sensing resistors. The package for the RV5VH series
is 8pin SSOP(0.65mm pitch), and it is suitable for power supply systems with positive and negative output, such as pager,
PDA, which need power supplies for LCD.
RV5VH1×× and RV5VH2×× series are able to provide two DC/DC converters, one is a step-up DC/DC converter with
internally fixed output and the other is an inverting DC/DC converter with adjustable output by external resistors. A volt-
age detector with sensing pin is also included. RV5VH3××series are able to provide two DC/DC converters, both of them
require external drivers, DC/DC1, and inverting one, DC/DC2, can be adjustable by resistors.
FEATURES
• Dual DC/DC converter system
.................................
DC/DC1 : step-up
DC/DC2 : inverting(negative voltage)
Nch. Open Drain Output
..........................................................
• Voltage Detector
• Low voltage operation available
..........................................
RV5VH1××,RV5VH2××
oscillator start-up from 0.8V
oscillator start-up from 1.8V
TYP. 80%
.................................................................
RV5VH3××
• High Efficiency
.............................................................
• Low Supply Current
• High accuracy feedback sensing
• Sleep Mode
...............................
TYP. 2.5%
..........................................
RV5VH1××, RV5VH2××
DC/DC 2
.................................................................
RV5VH3××
DC/DC1, 2
.........................
• Available to adjust temperature drift
DC/DC2 : with external resistor (RV5VH2××, RV5VH3××)
coefficient of output voltage
..............................................................
• Small Package
8pin SSOP(0.65mm pitch)
APPLICATIONS
• Power source for telecommunication systems
• Power source for portable data processing systems, e.g. PDA, Electronic Data Banks
• Power source for Audio-Visual systems, e.g. CD players, Video cameras
• Power source for Notebook PCs, Word processing systems
• Gadgets which need two power supplies, e.g. CPU and LCD
1
DC/DC CONVERTER CONTROLLER
(BOOST / INVERTING)
RV5VH1××/RV5VH2××
BLOCK DIAGRAM
• RV5VH1××
CSW
1
2
3
4
–
+
8
7
6
5
DOUT
FB
VSEN
VOUT1
LX1
–
+
Vref
Error Amp.2
Error Amp.1
–
EXT2
VFM2
+
VLX lim.
VFM1
GND
p_shift
OSC
• RV5VH2××
CSW
VSEN
1
2
3
4
–
+
8
7
6
5
DOUT
FB
–
+
Vref
Error Amp.2
Error Amp.1
–
VOUT1
EXT1
EXT2
VFM2
+
GND
p_shift
VFM1
OSC
2
RV5VH1××/RV5VH2××
PIN CONFIGURATION
• 8 pin SSOP (0.65mm pitch)
1
2
3
4
8
7
6
5
PIN DESCRIPTION
• RV5VH1××
Pin No.
Symbol
CSW
VSEN
VOUT1
LX1
Description
1
2
3
4
5
6
7
8
Control switch for DC/DC2
Sensing Pin for Voltage Detector
Output for DC/DC1, Power supply for the device
Output for DC/DC1, switching (Nch Open-Drain)
Ground
GND
EXT2
FB
External Transistor drive pin for DC/DC2 (CMOS output)
Input for DC/DC2 Error Amplifier
Output for Voltage detector
DOUT
• RV5VH2××
Pin No.
Symbol
CSW
VSEN
VOUT1
EXT1
GND
EXT2
FB
Description
Contol switch for DC/DC2
1
2
3
4
5
6
7
8
Sensing Pin for Voltage Detector
Output for DC/DC1, Power supply for the device
External Transistor drive pin for DC/DC1 (CMOS output)
Ground
External Transistor drive pin for DC/DC2 (CMOS output)
Input for DC/DC2 Error Amplifier
DOUT
Output for Voltage Detector
3
RV5VH1××/RV5VH2××
ABSOLUTE MAXIMUM RATINGS
• RV5VH1××
Symbol
VOUT1
VLX1
Item
Ratings
Unit
V
VOUT1 Pin Voltage
12
LX1 Pin Voltage
12
V
VSEN
DOUT
VCSW
VEXT2
VFB
VSEN Pin Voltage
12
12
V
DOUT Pin Voltage
V
CSW Pin Voltage
–0.3 to VOUT1 +0.3
–0.3 to VOUT1 +0.3
–0.3 to VOUT1 +0.3
400
V
EXT2 Pin Voltage
V
FB Pin Voltage
V
ILX1
LX1 Output Current
EXT2 Output Current
Power Dissipation
Operating Temperature
Storage Temperature
Lead Temperature (Soldering)
mA
mA
mW
˚C
˚C
IEXT2
PD
50
300
Topt
–40 to +85
–55 to +125
260˚C 10sec
Tstg
Tsolder
4
RV5VH1××/RV5VH2××
• RV5VH2××
Symbol
VOUT1
VSEN
Item
VOUT1 Pin Voltage
Ratings
Unit
V
12
12
VSEN Pin Voltage
V
DOUT
DOUT Pin Voltage
12
V
VCSW
CSW Pin Voltage
–0.3 to VOUT1 +0.3
–0.3 to VOUT1 +0.3
–0.3 to VOUT1 +0.3
50
V
VEXT1, 2
VFB
EXT1, 2 Pin Voltage
FB Pin Voltage
V
V
IEXT1, 2
PD
EXT1, 2 Output Current
Power Dissipation
mA
mW
˚C
˚C
300
Topt
Operating Temperature
Storage Temperature
Lead Temperature (Soldering)
–40 to +85
–55 to +125
260˚C 10sec
Tstg
Tsolder
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.
5
RV5VH1××/RV5VH2××
ELECTRICAL CHARACTERISTICS
• RV5VH101
DC/DC Converter 1
VOUT1=3.0V, Topt=25˚C
Symbol
VOUT1
VINmax
Vstart
Vhold
ISS1
Item
Conditions
MIN.
TYP.
MAX.
3.075
10
Unit
V
Step-up Output Voltage
Maximum Input Voltage
Oscillator Start-up Voltage
Hold-on Input Voltage
Supply Current1 *1
2.925
3.000
V
No Load
0.7
10
0.8
V
IOUT=1mA, VIN : 2→0V
No Load, CSW=“L”
VLX=0.4V
0.7
V
µA
mA
µA
kHz
%
ILX
LX Switching Current
LX Leakage Current
100
ILXleak
fosc
VLX=6.0V, VIN=3.5V
0.03
130
65
1
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
110
50
150
80
Maxdty
η
ON (VLX=“L”)
80
%
VLXlim
Voltage Limit for LX Switch
for LX pin
0.4
0.8
V
∆VOUT1
Output Voltage Temp. Coefficient
–40˚C≤Topt≤85˚C
100
ppm/˚C
∆Topt
) VIN=1.2V, IOUT=10mA, Topt=25˚C, unless otherwise specified. (See Typical Application)
*
*
1 ) This value only shows the supply current of DC/DC1, not include the supply current of Voltage Detector and external resistors.
6
RV5VH1××/RV5VH2××
DC/DC Converter 2
VOUT1=3.0V, Topt=25˚C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
0
Unit
V
1
VSET
VFB
Set Output Voltage
*
Feed Back Voltage
–20
0
20
mV
V
VIN
Maximum Input Voltage
Minimum Operating Voltage
Supply Current2
10
VOPTmin
ISS2
IOUT=1mA
CSW= “H” at No Load
CSW=“L”
1.8
V
10
0.3
4
µA
µA
mA
mA
kHz
%
Istandby
IEXT2H
IEXT2L
fosc
Standby Current
EXT2 “H” Output Current
EXT2 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
CSW “H” Input Voltage
CSW “L” Input Voltage
CSW Input Leakage Current
VEXT2=VOUT1–0.4V
VEXT2=0.4V
2
4
8
110
40
1.6
0
130
50
150
60
Maxdty
VCSWH
VCSWL
ICSWleak
VEXT2=“H”
VOUT1=3.0V
VOUT1=3.0V
VOUT1=3.0V
VOUT1
0.4
V
V
–0.5
0.5
µA
∆VFB
Feed Back Voltage Temp.Coefficient
–40˚C≤Topt≤85˚C
30
µV/˚C
∆Topt
) VOUT1=3.0V, IOUT=1mA, Topt=25˚C, unless otherwise specified. (See Typical Application)
1 ) Adjustable by external resistors to -30V.
*
*
7
RV5VH1××/RV5VH2××
Voltage Detector
VOUT1=3.0V, Topt=25˚C
Symbol
VDET
Item
Conditions
MIN.
2.633
0.081
TYP.
2.700
0.135
1.2
MAX.
2.767
0.189
Unit
V
Detector Threshold
VHYS
Detector Threshold Hysteresis
Supply Current3
V
ISS3
µA
V
VINmax
VOPTmin
Maximum Input Voltage
Minimum Operating Voltage
10
1.8
V
VDS=0.5V, VOUT1=1.5V
VDS=0.5V, VOUT1=3.0V
VSEN=3.0V
1.0
4.0
2.0
5.0
0.3
mA
mA
µA
V
IOUT
Output Current
ISEN
VSEN
tPLH
Sensing pin Input Current
Sensing pin Input Voltage
Output Delay
1.2
10
0.7
100
µs
∆VOUT1
DetectorThresholdTemp.Coefficient
DOUT Leakage Current
–40˚C≤Topt≤85˚C
100
ppm/˚C
µA
∆Topt
IDOUTleak
0.03
0.5
) VOUT1=3.0V, Topt=25˚C, unless otherwise specified. (See Typical Application)
*
8
RV5VH1××/RV5VH2××
• RV5VH102
DC/DC Converter 1
Symbol
VOUT1=5.0V, Topt=25˚C
Item
Conditions
MIN.
TYP.
MAX.
5.125
10
Unit
V
VOUT1
VINmax
Vstart
Vhold
ISS1
Step-up Output Voltage
Maximum Input Voltage
Oscillator Start-up Voltage
Hold-on Input Voltage
Supply Current1 *1
4.875
5.000
V
No Load
IOUT=1mA, VIN : 2→0V
No Load, CSW=“L”
VLX=0.4V
0.7
15
0.8
V
1.2
V
µA
mA
µA
kHz
%
ILX
LX Switching Current
LX Leakage Current
100
ILXleak
fosc
VLX=6.0V, VIN=5.5V
0.03
130
70
1
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
110
55
150
85
Maxdty
η
ON (VLX=“L”)
80
%
VLXlim
Voltage Limit for LX Switch
0.4
0.8
V
∆VOUT1
Output Voltage Temp. Coefficient
–40˚C≤Topt≤85˚C
100
ppm/˚C
∆Topt
) VIN=1.2V, IOUT=10mA, Topt=25˚C, unless otherwise specified. (See Typical Application)
*
*
1 ) This value only shows the supply current of DC/DC1, not include the supply current of Voltage Detector and external resistors.
9
RV5VH1××/RV5VH2××
DC/DC Converter 2
VOUT1=5.0V, Topt=25˚C
Symbol
VSET
Item
Conditions
MIN.
TYP.
–3.000
0
MAX.
Unit
V
1
Set Output Voltage
*
0
VFB
Feed Back Voltage
mV
V
VIN
Maximum Input Voltage
Minimum Operating Voltage
Supply Current2
10
VOPTmin
ISS2
IOUT=1mA
CSW= “H” at No Load
CSW=“L”
1.8
V
25
0.3
6
µA
µA
mA
mA
kHz
%
Istandby
IEXT2H
IEXT2L
fosc
Standby Current
EXT2 “H” Output Current
EXT2 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
CSW “H” Input Voltage
CSW “L” Input Voltage
CSW Input Leakage Current
VEXT2=VOUT1–0.4V
VEXT2=0.4V
3
7
14
130
50
110
40
1.6
0
150
60
Maxdty
VCSWH
VCSWL
ICSWleak
VEXT2=“H”
VOUT1=5.0V
VOUT1=5.0V
VOUT1=5.0V
VOUT1
0.4
V
V
–0.5
0.5
µA
∆VFB
Feed Back Voltage Temp.Coefficient
–40˚C≤Topt≤85˚C
30
µV/˚C
∆Topt
) VOUT1=3.0V, IOUT=1mA, Topt=25˚C, unless otherwise specified. (See Typical Application)
1 ) Adjustable by external resistors to -30V.
*
*
10
RV5VH1××/RV5VH2××
Voltage Detector
VOUT1=5.0V, Topt=25˚C
Symbol
Item
Conditions
MIN.
4.388
0.135
TYP.
4.500
0.225
1.8
MAX.
4.612
0.315
Unit
V
VDET
VHYS
Detector Threshold
Detector Threshold Hysteresis
Supply Current3*1
V
ISS3
µA
V
VINmax
VOPTmin
Maximum Input Voltage
Minimum Operating Voltage*2
10
1.8
V
VDS=0.5V, VOUT1=1.5V
VDS=0.5V, VOUT1=5.0V
VSEN=5.0V
1.0
7.0
2.0
10.0
0.7
mA
mA
µA
µs
IOUT
Output Current
ISEN
tPLH
Sensing Pin Input Current
Output Delay
2.0
100
∆VOUT1
DetectorThresholdTemp.Coefficient
DOUT Leakage Current
–40˚C≤Topt≤85˚C
100
ppm/˚C
µA
∆Topt
IDOUTleak
0.03
0.5
) VOUT1=3.0V, Topt=25˚C, unless otherwise specified. (See Typical Application)
*
11
RV5VH1××/RV5VH2××
• RV5VH201
DC/DC Converter 1
VOUT1=3.0V, Topt=25˚C
Symbol
VOUT1
VINmax
Vstart
Vhold
ISS1
Item
Conditions
MIN.
TYP.
MAX.
3.075
10
Unit
V
Step-up Output Voltage
Maximum Input Voltage
Oscillator Start-up Voltage
Hold-on Input Voltage
IOUT=0mA
2.925
3.000
V
No Load
IOUT=1mA
0.7
0.8
V
0.7
V
Supply Current1 *1
IOUT=0mA, CSW=“L”
VEXT2=VOUT1–0.4V
VEXT2=0.4V
80
3
µA
mA
mA
kHz
%
IEXT1H
IEXT1L
fosc
EXT1 “H” Output Current
EXT1 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
1.5
4
8
110
50
130
65
150
80
Maxdty
ON (VLX=“L”)
∆VOUT1
Output Voltage Temp. Coefficient
–40˚C≤Topt≤85˚C
100
ppm/˚C
∆Topt
) VIN=1.2V, IOUT=10mA, unless otherwise specified. (See Typical Application)
*
*
1 ) This value shows only the supply current of DC/DC1, not include the supply current of Voltage Detector and external resistors.
12
RV5VH1××/RV5VH2××
DC/DC Converter 2
VOUT1=3.0V, Topt=25˚C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
0
Unit
V
1
VSET
VFB
Output Voltage Setting Range
Feed Back Voltage
*
–20
0
20
mV
V
VIN
Maximum Input Voltage
Minimum Operating Voltage*2
Supply Current2*3
10
VOPTmin
ISS2
IOUT=1mA
CSW= “H” IOUT=0mA
CSW=“L”
1.8
V
10
0.3
4
µA
µA
mA
mA
kHz
%
Istandby
IEXT2H
IEXT2L
fosc
Standby Current
EXT2 “H” Output Current
EXT2 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
VEXT2=VOUT1–0.4V
VEXT2=0.4V
2
4
8
110
40
1.6
0
130
50
150
60
Maxdty
VCSWH
VCSWL
ICSWleak
VEXT2=“H”
VOUT1=3.0V
VOUT1=3.0V
CSW=3.0V
CSW “H” Input Voltage
CSW “L” Input Voltage
CSW Input Leakage Current
VOUT1
0.4
V
V
–0.5
0.5
µA
∆VFB
Feed Back Voltage Temp. Coefficient
–40˚C≤Topt≤85˚C
30
µV/˚C
∆Topt
) VOUT1=3.0V, VOUT2=-0.3V, IOUT2=1mA, unless otherwise specified. (See Typical Application)
1 ) Adjustable by external resistors to -30V.
*
*
*
*
2 ) “Minimum Operating Voltage”means a voltage for the “VOUT1” pin.
3 ) This value shows only the supply current of DC/DC2, not include the supply current of external resistors.
13
RV5VH1××/RV5VH2××
Voltage Detector
VOUT1=3.0V, Topt=25˚C
Symbol
VDET
Item
Conditions
MIN.
2.633
0.081
TYP.
2.700
0.135
1.2
MAX.
2.767
0.189
Unit
V
Detector Threshold
VHYS
Detector Threshold Hysteresis
Supply Current3*1
V
ISS3
µA
V
VINmax
VOPTmin
Maximum Input Voltage
Minimum Operating Voltage*2
10
1.8
V
VDS=0.5V, VOUT1=1.5V
VDS=0.5V, VOUT1=3.0V
VSEN=3.0V
1.0
4.0
2.0
5.0
0.3
mA
mA
µA
µs
IOUT
Output Current
ISEN
tPLH
Sensing Pin Input Current
Output Delay
1.2
100
∆VOUT1
DetectorThresholdTemp.Coefficient
DOUT Leakage Current
–40˚C≤Topt≤85˚C
100
ppm/˚C
µA
∆Topt
IDOUTleak
0.03
0.5
) VOUT1=3.0V : unless otherwise specified. (See Typical Application)
1 ) This value only shows the supply current of voltage detector.
2 ) “Minimum Operating Voltage”means a voltage for the “VOUT1” pin.
*
*
*
14
RV5VH1××/RV5VH2××
• RV5VH202
DC/DC Converter 1
Symbol
VOUT1=5.0V, Topt=25˚C
Item
Conditions
MIN.
TYP.
MAX.
5.125
10
Unit
V
VOUT1
VINmax
Vstart
Vhold
ISS1
Step-up Output Voltage
Maximum Input Voltage
Oscillator Start-up Voltage
Hold-on Input Voltage
Supply Current1 *1
IOUT=0mA
4.875
5.000
V
No Load
IOUT=1mA
0.7
0.8
V
0.7
V
IOUT=0mA, CSW=“L”
VEXT2=VOUT1–0.4V
VEXT2=0.4V
40
4
µA
mA
mA
kHz
%
IEXT1H
IEXT1L
fosc
EXT1 “H” Output Current
EXT1 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
Efficiency
2
7
14
130
70
80
110
55
150
85
Maxdty
η
ON (VLX=“L”)
%
∆VOUT1
Output Voltage Temp. Coefficient
–40˚C≤Topt≤85˚C
100
ppm/˚C
∆Topt
) VIN=3.0V, IOUT=10mA : unless otherwise specified. (See Typical Application)
*
*
1 ) This value only shows the supply current of DC/DC1, does not include the supply current of Voltage Detector and external resistors.
15
RV5VH1××/RV5VH2××
DC/DC Converter 2
VOUT1=5.0V, Topt=25˚C
Symbol
VSET
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
1
Output Voltage Setting Range
Feed Back Voltage
*
0
VFB
0
mV
V
VIN
Maximum Input Voltage
Minimum Operating Voltage*2
Supply Current2*3
10
VOPTmin
ISS2
IOUT=1mA
CSW= “H”, No Load
CSW=“L”
1.8
V
25
0.3
6
µA
µA
mA
mA
kHz
%
Istandby
IEXT2H
IEXT2L
fosc
Standby Current
EXT2 “H” Output Current
EXT2 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
VEXT2=VOUT1–0.4V
VEXT2=0.4V
3
7
14
130
50
110
40
1.6
0
150
60
Maxdty
VCSWH
VCSWL
ICSWleak
VEXT2=“H”
VOUT1=5.0V
VOUT1=5.0V
CSW=5.0V
CSW “H” Input Voltage
CSW “L” Input Voltage
CSW Input Leakage Current
VOUT1
0.4
V
V
–0.5
0.5
µA
∆VFB
Feed Back Voltage Temp.Coefficient
–40˚C≤Topt≤85˚C
±30
µV/˚C
∆Topt
) VOUT1=5.0V, VOUT2=–3.0V, IOUT2=1mA : unless otherwise specified. (See Typical Application)
1 ) Adjustable by external resistors to -30V.
*
*
*
*
2 ) “Minimum Operating Voltage”means a voltage for the “VOUT1” pin.
3 ) This value shows only the supply current of DC/DC2, not include the supply current of external resistors.
16
RV5VH1××/RV5VH2××
Voltage Detector
VOUT1=5.0V, Topt=25˚C
Symbol
Item
Conditions
MIN.
4.388
0.135
TYP.
4.500
0.225
1.8
MAX.
4.612
0.315
Unit
V
VDET
VHYS
Detector Threshold
Detector Threshold Hysteresis
Supply Current3*1
V
ISS3
µA
V
VINmax
VOPTmin
Maximum Input Voltage
Minimum Operating Voltage*2
10
1.8
V
VDS=0.5V, VOUT1=1.5V
VDS=0.5V, VOUT1=5.0V
VSEN=5.0V
1.0
7.0
2.0
10.0
0.7
mA
mA
µA
µs
IOUT
Output Current
ISEN
tPLH
Sensing Pin Input Current
Output Delay
2.0
100
∆VOUT1
Detector Threshold Temp.Coefficient
DOUT Leakage Current
–40˚C≤Topt≤85˚C
100
ppm/˚C
µA
∆Topt
IDOUTleak
0.03
0.5
) VOUT1=5.0V : unless otherwise specified. (See Typical Application)
1 ) This value only shows the supply current of voltage detector.
2 ) “Minimum Operating Voltage”means a voltage for the “VOUT1” pin.
*
*
*
17
RV5VH1××/RV5VH2××
OPERATION
• DC/DC Converter 1
RV5VH1××
Vref
VOUT1
3
4
+
–
VOUT1
OSC
R
SBD
C
Error Amp.1
L
p_shift
VLX lim.
LX1
VFM1
VIN
RV5VH2××
Vref
VOUT1
3
4
+
–
VOUT1
OSC
R
SBD
C
L1
Error Amp.1
EXT1
Rb
p_shift
NPN Tr.
VIN
VFM1
Cb
The DC/DC1 uses input voltage as an initial power supply, once boost operation is started, the boost output will be used
for the power supply of device itself. A change in the VOUT1 will feed back to the internal error amplifier through external
voltage setting resistors and internal feed back resistors. When the feed back voltage is lower than the reference voltage
the error amplifier enables oscllation or otherwise will stop oscillation. The internal feed back resistor “R” which is fixed
and adjusted by laser trim can make the feed back input voltage to “Error Amp.1” stable. Pulses from the “OSC” circuit
have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the “P_shift” circuit. The duty cycle may be
smaller with light load spontaneously.
These clook pulses control VFM circuit and make it possible to operate as a boost converter. The output of LX1 is Nch open
drain, while the output of “EXT1” is driven by CMOS buffer and an external NMOS driver is also available instead of an
NPN transistor, in such cases the Rb and the Cb are not necessary. A recommended Rb is 300Ω. When you use a MOS-
FET for the EXT1, the input voltage should be high enough and you can get high effiiciency applications.
A current limit is available only for the RV5VH1 series, to prevent an excess current from flowing through Nch driver tran-
sistor.
The DC/DC1 can be shut down by CSW pin. When the CSW pin is High, VDD level, the DC/DC1 is enabled and when the
CSW pin is “L”, GND level, the DC/DC1 is disabled. The EXT1 pin outputs “L” while the DC/DC1 is disabled.
18
RV5VH1××/RV5VH2××
• DC/DC Converter 2
VOUT1
RV5VH1××/RV5VH2××
CSW
FB
1
7
R1
R2
–
OSC
C2
+
Error Amp.2
PMOS
L
SBD
EXT2
VOUT2
6
VFM2
C1
+
The DC/DC2 can operate by a voltage of “VOUT1”. A change in the VOUT2 will feed back to the internal error amplifier
through external voltage setting resistors. The reference voltage should be provided from externally fixed power supply
such as VOUT1.
When the feed back voltage to the cmp2 is higher than the ground voltage the error amplifier enables oscillation or other-
wise will stop oscillation.
Pulses from the “OSC” circuit have a duty cycle of 50% and it makes VFM operation allowable. There might be certain
cases that the duty cycles becomes smaller temporarily at light load current. The output of “EXT2” is driven by CMOS
buffer operated VOUT1 and GND.
A PMOS driver will be connected to the “EXT2” pin and its switching operation generates negative output voltage through
energy accumulated in an inductor.
The DC/DC1 can be shut down by CSW pin. When the CSW pin is “H”, VDD level, the DC/DC1 is enabled and when the
CSW pin is “L”, GND level, the DC/DC1 is disabled. The EXT2 pin outputs High while the DC/DC2 is disabled.
• Set output voltage DC/DC Converter2
VOUT2 is described as follows:
VOUT1:R1=|–VOUT2| : R2 / The FB voltage is controlled to 0V and VOUT1 is provided externally
|–VOUT2|=VOUT1 × R2/R1
thus, any output voltage of DC/DC2 can be set by changing R1 or/and R2.
Certain temperature coefficient of VOUT2 can be set by using R1,R2 having such temperature characteristics.
19
RV5VH1××/RV5VH2××
• Voltage Detector
RV5VH1××/RV5VH2××
VSEN
DOUT
2
8
Ra
Pull-up
Output Tr.
+
–
Vref
Tr.1
Rb
Rc
The VD can operate by the voltage of “VOUT1”. The detector threshold and the reset voltage are internally adjusted by
trimmed resistors and the VD monitors VSEN pin voltage.
The DOUT is Nch open-drain output and a pull up resistor is necessary.
Oepration Diagram
VSEN pin is pulled up to VOUT1 voltage
Step
Step 1
Step 2
Step 3
Step 4
Step 5
1
2
3
4
5
Comparator(+) Pin
Input Voltage
A
B
B
B
A
B
Reset Voltage
Detector Threshold –VDET
+VDET
Hysteresis Range
A
Comparator Output
Tr. 1
H
L
L
L
H
OFF
OFF
ON
ON
ON
OFF
OFF
GND
Output Tr
ON Indefinite ON
Output Voltage
Rb+Rc
Ra+Rb+Rc
Rb
×
×
A :
B :
VSEN
GND
VSEN
Ra+Rb+Rc
Step 1. Output Voltage is equal to Pull-up Voltage.
Step 2. When Input voltage (VSEN) reaches the state of Vref≥VSEN×(Rb×Rc)/(Ra+Rb+Rc) at point A, the output of the comparator is reversed. so that the
output voltage becomes to GND.
Step 3. Output VoItage becomes indefinite when Power source Voltage (VSEN) is smaller than Minimum Operating VoItage. When the output is pulIed up,
Output becomes pull-up voltage and GND.
Step 4. Output VoItage becomes to GND.
Step 5. When input voltage(VSEN) reaches the state of Vref≤VSEN×Rb/(Ra+Rb) at point B, the output of the comparator is reversed, so that the output voltage
becomes to pull-up voltage.
20
RV5VH1××/RV5VH2××
OPERATION OF STEP-UP DC/DC CONVERTER
Step-up DC/DC Converter charges energy in the inductor when Lx Transistor (LxTr) is on, and discharges the
energy with the addition of the energy from Input Power Source thereto, so that a higher output voltage than the
input voltage is obtained.
The operation will be explained with reference to the following diagrams :
< Basic Circuits >
< Current through L >
IL
i2
SD
ILmax
ILmin
topen
IOUT
L
VIN
VOUT
i1
t
Lx Tr
CL
toff
ton
T=1/fosc
Step 1 : LxTr is turned ON and current IL (=i1 ) flows, so that energy is charged in L. At this moment, IL(=i1 )
is increased from ILmin (=0) to reach ILmax in protection to the on-time period (ton) of LxTr.
Step 2 : When LxTr is turned OFF, Schottky diode (SD) is turned on in order that L maintains IL at ILmax, so that
current IL (=i2) is released.
Step 3 : IL (=i2) is gradually decreased, and IL reaches ILmin (=0) after a time period of topen, so that SD is
turned OFF.
In the case of VFM control system, the output voltage is maintained constant by controlling the oscillator fre-
quency (fosc) with the on-time period (ton) being maintained constant.
In the above two diagrams, the maximum value (ILmax) and the minimum value (ILmin) of the current which
flows through the inductor are the same as those when LxTr is ON and also when LxTr is OFF.
The difference between ILmax and ILmin, which is represented by ∆I, is:
..........................................
Equation 1
∆I=ILmax–ILmin=VIN · ton/L=(VOUT–VIN) · topen/L
wherein T=1/fosc=ton+toff
duty (%)=ton/T · 100=ton · fosc · 100
topen≤toff
In Equation 1,VIN · ton/L and (VOUT–VIN) · topen/L are respectively the change in the current at ON, and the
change in the current at OFF.
In the VFM system, topen < toff as illustrated in the above diagram. In this case, the energy charged in the
inductor during the time period of ton is discharged in its entirely during the time period of toff, so that ILmin
becomes zero (ILmin=0).
21
RV5VH1××/RV5VH2××
SELECTION OF PERIPHERAL COMPONENTS
When LxTr is on, the energy PON charged in the inductor is provided by Equation 2 as follows :
2
PON=∫0ton (VIN · IL (t)) dt=∫ton (VIN · t/L) dt
......0..............................................................................................
2
=VIN · ton2/(2 · L)
Equation 2
In the case of the step-up DC/DC converter, the energy is also supplied from the input power source at the time
of OFF.
Thus, POFF =∫0topen(VIN · IL (t)) dt=∫0topen (VIN · (VOUT–VIN) · t/L)dt
=VIN · (VOUT–VIN) · topen2/(2 · L)
Here, topen=VIN · ton/(VOUT–VIN) from Equation 1, and when this is substituted into the above equation.
3
2
............................................................................
=VIN · ton /(2 · L · (VOUT–VIN))
Input power PIN is (PON+POFF)/T. When this is converted in its entirely to the output.
PIN=(PON+POFF)/T=VOUT · IOUT=POUT .........................................................................
Equation 3
Equation 4
Equation 5 can be obtained as follows by solving Equation 4 for IOUT by substituting Equation 2 and 3 into
Equation 4 :
IOUT=VIN · ton2/(2 · L · T · (VOUT–VIN)
2
2
2
...................................................
=VIN · maxdty /(20000 · fosc · L · (VOUT–VIN))
Equation 5
The peak current which flows through L · LxTr · SD is
..........................................................................................................
ILmax=VIN · ton/L
Equation 6
Therefore, it is necessary that the setting of the input/output conditions and the selection of peripheral compo-
nents be made with ILmax taken into consideration.
HINTS
The above explanation is directed to the calculation in an ideal case where it is supposed that there is no
energy loss in the external components and LxSW. In an actual case, the maximum output current will be 50
to 80% of the above calculated maximum output current. In particular, care must be taken because VIN is
decreased in an amount corresponding to the voltage reduction caused by LxSW when IL is large or VIN is
small. Furthermore, It is required that with respect to VOUT, Vf of the diode (about 0.3V in the case of a
Schottky type diode) be taken into consideration.
When ILX and VLX exceed their respective ratings, use the RV5VH with the attachment of an external tran-
sistor with a low saturation voltage thereto.
22
RV5VH1××/RV5VH2××
TYPICAL APPLICATION
• RV5VH1××
R3
R1
DOUT
CSW
VSEN
FB
PMOS
Output DC/DC1
R2
C3
VOUT1
LX1
EXT2
GND
D2
D1
Output DC/DC2
C2
L1
C1
L2
<Components>
CoiIs
L1 : 100µH, L2 : 220µH
Schottky type
C1, C2 : 22µF(tantalum type), C3 : 0.01µF(ceramic type)
PMOS : 2SJ238
Diodes
Capacitors
Tr
Resistors
R1, R2 : several hundreds kΩ, R3 : 100kΩ
• RV5VH2××
R3
R1
R2
DOUT
FB
CSW
VSEN
PMOS
Output DC/DC1
C3
VOUT1
EXT2
GND
L1
SBD
SBD
EXT1
C4
Output DC/DC2
C2
C1
L2
NPN Tr.
R4
<Components>
Coils
Diodes
Capacitors
L1 : 27µH, L2 : 220µH
Schottky type
C1 : 47µF(tantalum type), C2 : 22µF(tantalum type)
C3 : 0.01µF(ceramic type)
C4 : 0.01µF(ceramic type)
2SJ238(TOSHIBA), etc.
2SD1628G(SANYO), etc.
R1 : 100KΩ
PMOS
NPN Tr.
Resistors
R2 : 0-500KΩ
R3 : 100KΩ
R4 : 300Ω
23
RV5VH1××/RV5VH2××
TEST CIRCUITS
CSW
VSEN
VOUT1
LX1
DOUT
FB
EXT2
GND
22µF
L1
V
A
L1=100µH,220µH
Fig.1 Test Circuit 1
100kΩ
CSW
DOUT
FB
A
VSEN
5Ω
VOUT1
EXT2
GND
*
(150Ω)
150Ω
LX1(EXT1)
V
V
EXT1
*
Oscilloscope
Fig.2 Test Circuit 2
CSW
VSEN
VOUT1
LX1
DOUT
FB
A
EXT2
GND
0.5V
Fig.3 Test Circuit 3
24
RV5VH1××/RV5VH2××
100kΩ
CSW
VSEN
VOUT1
LX1
DOUT
FB
EXT2
GND
Oscilloscope
Pulse Input
Fig.4 Test Circuit 4
CSW
VSEN
DOUT
FB
VOUT1
EXT1
EXT2
GND
2200pF
96µF
27µH
V
A
300Ω
Fig.5 Test Circuit 5
Test Circuit 1:
Test Circuit 2:
Test Circuit 3:
Test Circuit 4:
Test Circuit 5:
Typical Characteristics 1), 3), 5), 10), 11)
Typical Characteristics 6), 7), 8), 9), 13), 14), 15), 16), 17), 18), 19), 21)
Typical Characteristics 20)
Typical Characteristics 22)
Typical Characteristics 2), 4)
Typical Application : Typical Characteristics 12)
25
RV5VH1××/RV5VH2××
TYPICAL CHARACTERISTICS
• DC/DC Converter 1
1) Output Voltage vs. Output Current (RV5VH1××)
Topt=25˚C
Topt=25˚C
L1=220µH
C1=22µF
L1=100µH
C1=22µF
RV5VH101
RV5VH101
3.6
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
3.4
3.2
3.0
VIN=1.2V
2.8
VIN=1.2V
VIN=2.0V
VIN=0.9V
2.6
2.4
2.2
2.0
VIN=1.5V VIN=2.0V
VIN=0.9V
VIN=1.5V
0
20
40
60
80 100 120 140
0
20
40
60
80 100 120 140
Output Current IOUT(mA)
Output Current IOUT(mA)
Topt=25˚C
L1=100µH
C1=22µF
Topt=25˚C
L1=220µH
C1=22µF
RV5VH102
RV5VH102
6.0
5.5
5.0
4.5
4.0
3.5
3.0
6.0
5.5
5.0
4.5
4.0
3.5
3.0
VIN=1.5V
VIN=0.9V
VIN=4.0V
VIN=4.0V
VIN=1.5V
VIN=2.0V
VIN=3.0V
VIN=2.0V
VIN=0.9V
VIN=3.0V
0
50
100
150
200
250
300
0
50
100
150
200
250
300
Output Current IOUT(mA)
Output Current IOUT(mA)
2) Output Voltage vs. Output Current (RV5VH2××)
Topt=25˚C
L1=27µH
C1=96µF
Topt=25˚C
L1=27µH
RV5VH202
RV5VH201
C1=96µF
6.0
5.5
5.0
4.5
4.0
3.5
3.0
3.6
3.4
3.2
3.0
VIN=4.0V
VIN=3.0V
VIN=2.0V
VIN=1.5V
VIN=1.2V VIN=1.5V VIN=2.0V
VIN=0.9V
2.8
2.6
2.4
2.2
2.0
VIN=0.9V
0
100
200
300
400
500
0
100
200
300
400
500
Output Current IOUT(mA)
Output Current IOUT(mA)
26
RV5VH1××/RV5VH2××
3) Efficiency vs. Output Current (RV5VH1××)
Topt=25˚C
Topt=25˚C
L1=100µH
C1=22µF
L1=220µH
RV5VH101
RV5VH101
C1=22µF
100
100
95
90
85
80
75
70
65
60
55
50
95
90
VIN=1.5V
VIN=2.0V
85
80
75
70
65
60
55
50
VIN=2.0V
VIN=1.2V
VIN=0.9V
VIN=0.9V
VIN=1.2V
1
VIN=1.5V
10
Output Current IOUT(mA)
0.01
0.1
1
100
0.01
0.1
10
100
Output Current IOUT(mA)
Topt=25˚C
L1=100µH
C1=22µF
Topt=25˚C
L1=220µH
C1=22µF
RV5VH102
RV5VH102
100
95
90
85
80
75
70
65
60
55
50
100
95
90
85
80
75
70
65
60
55
50
VIN=4.0V
VIN=4.0V
VIN=1.5V
VIN=3.0V
VIN=2.0V
VIN=0.9V
VIN=0.9V
VIN=3.0V
VIN=2.0V
VIN=1.5V
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
4) Efficiency vs. Output Current (RV5VH2××)
Topt=25˚C
L1=27µH
C1=96µF
Topt=25˚C
L1=27µH
RV5VH202
RV5VH201
C1=96µF
90
85
80
75
70
65
60
55
50
45
40
90
85
VIN=4.0V
VIN=1.5V
80
VIN=1.2V
VIN=2.0V
VIN=3.0V
VIN=2.0V
75
70
65
60
55
50
45
40
VIN=1.5V
VIN=0.9V
VIN=0.9V
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
27
RV5VH1××/RV5VH2××
5) DC/DC1 Output Voltage vs. Temperature
VIN=1.2V
VIN=3V
L1=100µH
C1=22µF
L1=100µH
RV5VH1××/2××
RV5VH1××/2××
C1=22µF
3.3
5.3
5.2
5.1
5.0
4.9
4.8
4.7
3.2
3.1
IOUT=1mA
IOUT=10mA
3.0
IOUT=10mA
IOUT=5mA
IOUT=0A
2.9
2.8
2.7
IOUT=0A
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
6) Oscillator Frequency vs. Temperature
RV5VH1××/2××
RV5VH1××/2××
VOUT1=5V
VOUT1=3V
150
145
140
135
130
125
120
115
110
105
100
150
145
140
135
130
125
120
115
110
105
100
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
7) Oscillator Duty Cycle vs. Temperature
RV5VH1××/2××
RV5VH1××/2××
VOUT1=5V
VOUT1=3V
80
75
70
65
60
55
50
80
75
70
65
60
55
50
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
28
RV5VH1××/RV5VH2××
8) On Resistance of LX vs. Supply Voltage
RV5VH1××
5.0
85˚C
4.5
4.0
25˚C
3.5
3.0
–40˚C
2.5
2.0
1.5
1.0
0.5
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Supply Voltage VOUT1(V)
9) EXT1 Output Current vs. Temperature
RV5VH201
RV5VH202
VOUT1=3V
VOUT1=5V
18
16
14
12
10
8
18
16
14
12
10
8
“L” Output Current
“L” Output Current
“H” Output Current
“H” Output Current
6
6
4
4
2
2
0
0
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
10) Start-up/Hold-on Voltage vs. Output Current
11) Input Current vs. Intput Voltage
Topt=25˚C
VOUT1=3V
Topt=25˚C
CSW=GND
L1=100µH
C1=22µF
L1=100µH
RV5VH1××/2××
RV5VH101
C1=22µF
10–0
2
1.8
IOUT=30mA
10–1
1.6
Vstart
IOUT=5mA
1.4
1.2
1
IOUT=1mA
10–2
10–3
10–4
0.8
0.6
IOUT=0A
10–5
0.4
Vhold
0.2
0
10–6
0
10
20
30
40
50
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current IOUT(mA)
Input Voltage VIN(V)
29
RV5VH1××/RV5VH2××
• DC/DC Converter 2
12) Output Voltage vs. Output Current
Topt=25˚C
VIN=1.2V
VOUT1=3V
RV5VH101
0
–2
VSET –3V
–4
VSET –6V
VSET –9V
–6
–8
–10
–12
–14
VSET –12V
0
2
4
6
8
10
12
14
Output Current IOUT(mA)
13) DC/DC2 Feed Back Voltage vs. Temperature
RV5VH1××/2××
0.010
0.008
0.006
0.004
0.002
0.000
–0.002
–0.004
–0.006
–0.008
–0.010
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
14) EXT2 Output Current vs. Temperature
RV5VH1××/2××
RV5VH1××/2××
VOUT1=3V
VOUT1=5V
20
18
16
14
12
10
8
20
18
16
14
12
10
8
“L” Output Current
“L” Output Current
“H” Output Current
“H” Output Current
6
6
4
4
2
2
0
0
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
30
RV5VH1××/RV5VH2××
15) EXT2 Oscillator Frequency vs. Temperature
RV5VH1××/2××
RV5VH1××/2××
VOUT1=3V
VOUT1=5V
150
150
145
140
135
130
125
120
115
110
105
100
145
140
135
130
125
120
115
110
105
100
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
16) EXT2 Oscillator Duty Cycle vs. Temperature
RV5VH1××/2××
RV5VH1××/2××
VOUT1=3V
VOUT1=5V
60
60
58
56
54
52
50
48
46
44
42
40
58
56
54
52
50
48
46
44
42
40
–60 –40 –20
0
20 40 60 80 100
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
17) CSW ON/OFF Voltage vs. Temperature
RV5VH1××/2××
Temperature Topt(˚C)
VOUT1=3V
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
–60 –40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
31
RV5VH1××/RV5VH2××
• Voltage Detector
18) Detector Threshold Voltage vs. Temperature
19) VOUT1 Output Voltage vs. Output Current
RV5VH1××/2××
RV5VH1××/2××
3.0
5.0
4.5
4.0
3.5
3.0
2.5
2.9
+VDET
2.8
–VDET
2.7
2.0
25˚C
1.5
85˚C
2.6
2.5
1.0
–40˚C
0.5
0.0
–60 –40 –20
0
20 40 60 80 100
0
1
2
3
4
5
Temperature Topt(˚C)
VOUT1 Output Voltage VOUT1(V)
20) DOUT Output Current vs. VOUT1 Output Voltage
21) VSEN Output Current vs. VSEN Output Voltage
RV5VH1××/2××
RV5VH1××/2××
20
0.7
18
16
14
12
10
8
–40˚C
25˚C
0.6
0.5
0.4
85˚C
0.3
85˚C
6
0.2
25˚C
4
–40˚C
3
0.1
0.0
2
0
0
1
2
3
4
5
6
7
0
1
2
4
5
6
7
VOUT1 Output Voltage VOUT1(V)
VSEN Output Voltage VSEN(V)
22) Output Delay Time vs. Load Capacitance
RV5VH1××/2××
VOUT1=3V
10
1
tPLH
0.1
tPHL
0.01
0.0001
0.001
0.01
0.1
Load Capacitance COUT(µF)
32
DC/DC CONVERTER CONTROLLER
(BOOST / INVERTING OUTPUT FOR LCD)
RV5VH3××
BLOCK DIAGRAM
CSW
1
2
3
4
–
+
8
7
6
5
DOUT
FB1
VDD
FB2
–
+
Vref
Error Amp.2
–
+
EXT2
VFM2
Error Amp.1
EXT1
GND
p_shift
VFM1
OSC
PIN CONFIGURATION
• 8 pin SSOP (0.65mm pitch)
1
2
3
4
8
7
6
5
33
RV5VH3××
PIN DESCRIPTION
Pin No.
Symbol
CSW
FB1
Description
1
2
3
4
5
6
7
8
Control Switch for DC/DC1, 2
Input for DC/DC1 Error Amplifier
VDD
Power Supply for Device Itself. Sensing Pin for Reset.
External Transistor Drive Pin for DC/DC1 (CMOS Output)
Ground Pin
EXT1
GND
EXT2
FB2
External Transistor Drive Pin for DC/DC2 (CMOS Output)
Input for DC/DC2 Error Amplifier
DOUT
Output for Voltage Detector
ABSOLUTE MAXIMUM RATINGS
GND=0V
Symbol
Item
Ratings
12
Unit
VDD
VDD Pin Voltage
V
V
DOUT
VCSW
VEXT1, 2
VFB
DOUT Pin Voltage
12
CSW Pin Voltage
–0.3 to VDD+0.3
–0.3 to VDD+0.3
–0.3 to VDD+0.3
50
V
EXT1, 2 Pin Voltage
FB1,2 Pin Voltage
V
V
IEXT1, 2
PD
EXT1, 2 Output Current
Power Dissipation
mA
mΩ
˚C
˚C
300
Topt
Operating Temperature
Storage Temperature
Lead Temperature (Soldering)
–40 to +85
–55 to +125
260˚C 10sec
Tstg
Tsolder
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.
34
RV5VH3××
ELECTRICAL CHARACTERISTICS
• RV5VH301
DC/DC Converter 1
VDD=3.0V, Topt=25˚C
Symbol
VSET1
Item
Conditions
MIN.
2.05
TYP.
MAX.
Unit
V
1
Output Voltage Setting 1
Feed Back Volatage 1
Maximum Input Voltage
*
VFB1
1.950
2.000
2.050
10
V
VINmax
V
Specified as a VDD
VOPTmin
Minimum Operating Voltage
1.8
60
V
Voltage for Device Operation
ISS11
ISS12
Supply Current11*2
CSW=“H”, FB1=1.9V
CSW=“H”, FB1=2.1V
CSW=“L”
15
4
µA
µA
µA
mA
mA
kHz
%
Supply Current12*2
Istandby
IEXT1H
IEXT1L
fosc
Standby Current*3
4
11
EXT1 “H” Output Current
EXT1 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
VEXT1=VDD–0.4V
VEXT1=0.4V
1.5
4
3
8
110
50
130
65
150
80
Maxdty
ON (VEXT1=“L”)
∆VFB1
∆Topt
Feed Back Voltage Temp.Coefficient
–40˚C≤Topt≤85˚C
100
ppm/˚C
VCSWH
VCSWL
CSW “H” Input Voltage
CSW “L” Input Voltage
CSW Input Leakage Current
1.6
0
VDD
0.4
V
V
ICSWleak
CSW=3.0V or CSW=0V
–0.5
0.5
µA
) VDD=3.0V, IOUT=10mA : unless otherwise specified. (See Typical Application)
1 ) Adjustable by external resistors (to 30V).
*
*
*
*
2 ) Supply current for DC/DC1. Supply current for VD or external resistors are excluded.
3 ) Standby current includes supply current for DC/DC1, 2 and VD.
35
RV5VH3××
DC/DC Converter 2
VDD=3.0V, Topt=25˚C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
0
Unit
V
1
VSET2
VFB2
Output Voltage Setting 1
Feed Back Volatage 1
Maximum Input Voltage
*
–20
0
20
mV
V
VINmax
10
Specified as the VDD
VOPTmin
Minimum Operating Voltage
1.8
60
V
Voltage for Device Operation
ISS21
ISS22
Supply Current21*2
CSW=“H”, FB2=0.1V
CSW=“H”, FB2=–0.1V
VEXT2=VDD–0.4V
VEXT2=0.4V
15
4
µA
µA
Supply Current22*2
IEXT2H
IEXT2L
fosc
EXT2 “H” Output Current
EXT2 “L” Output Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
2
4
4
mA
mA
kHz
%
8
110
40
130
50
150
60
Maxdty
ON (VEXT2=“L”)
∆VFB2
∆Topt
Feed Back Voltage Temp.Coefficient
–40˚C≤Topt≤85˚C
30
µV/˚C
) VDD=3.0V : unless otherwise specified. (See Typical Application)
1 ) Adjustable by external resistors (to -30V).
*
*
*
2 ) This value shows only the supply current of DC/DC2, not include the supply current of external resistors.
36
RV5VH3××
Voltage Detector
VDD=3.0V, Topt=25˚C
Symbol
Item
Conditions
MIN.
2.633
0.081
TYP.
2.700
0.135
1.2
MAX.
2.767
0.189
Unit
V
VDET
VHYS
Detector Threshold
Detector Threshold Hysteresis
Supply Current3*1
V
ISS3
µA
V
VINmax
Maximum Input Voltage
10
Specified as the VDD
VOPTmin
Minimum Operating Voltage
Output Current
1.8
V
Voltage for Device Operation
VDS=0.5V, VDD=1.5V
VDS=0.5V, VDD=3.0V
1.0
4.0
2.0
5.0
mA
mA
µs
IOUT
tPLH
Output Delay
100
0.5
∆VOUT1
Detector Threshold Temp.Coefficient
DOUT Leakage Current
–40˚C≤Topt≤85˚C
100
ppm/˚C
µA
∆Topt
IDOUTleak
0.03
) VDD=3.0V : unless otherwise specified.
*
*
1 ) This value only shows the supply current of voltage detector.
37
RV5VH3××
OPERATION
• DC/DC Converter 1
VDD
RV5VH3××
3
1
CSW
Vref
FB1
VOUT1
R1
R2
+
–
2
OSC
SBD
L1
C
Error Amp.1
p_shift
EXT1
Rb
Cb
4
NPN Tr.
VFM1
VIN
The DC/DC1 can operate by an input voltage to the VDD pin. A change in the VOUT1 will feed back to the internal error
amplifier through external voltage setting resistors and internal feed back resistors. When the feed back voltage is lower
than the reference voltage, the error amplifier enables oscillation or otherwise, it will stop oscillation. The internal feed back
resistor “R” which is fixed and adjusted by laser trim can make the feed back input voltage to “Error Amp.1” stable.
Pulses from the “OSC” circuit have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the “P_shift” circuit.
These clock pulses control VFM circuit and make it possible to operate as a boost converter.
The output of “EXT1” is driven by CMOS buffer and an external NMOS driver is also available instead of an NPN transis-
tor, in such cases the Rb and the Cb are not necessary. The DC/DC1 can be shut down by CSW pin. When the CSW pin
is “H”, VDD level, the DC/DC1 is enabled and when the CSW pin is “L”, GND level, the DC/DC1 is disabled. The EXT1
pin outputs “L” while the DC/DC1 is disabled.
• Set Output Voltage DC/DC1
VOUT1 is described as follows :
VOUT1 : R1+R2=VFB1 : R2
DC/DC1 controls VFB1 to be a constant voltage,
VOUT1=VFB1 × (R1+R2) / R2
thus, any output voltage of DC/DC1 can be set by changing R1 or/and R2.
Certain temperature coefficient of VOUT1 can be set by using R1, R2 having such temperature characteristics.
38
RV5VH3××
• DC/DC Converter 2
VDD
VREF
RV5VH3××
CSW
FB2
1
7
R1
R2
–
+
OSC
C2
Error Amp.2
PMOS
L
SBD
EXT2
VOUT2
6
VFM2
C1
+
The DC/DC2 can operate by an input voltage to the VDD pin. A change in the VOUT2 will feed back to the internal error
amplifier through external voltage setting resistors. The VREF voltage should be provided from externally fixed power sup-
ply such as VOUT1.
When the feed back voltage to the Error Amp.2 is higher than the ground voltage, the error amplifier enables oscillation
otherwise, it will stop oscillation.
Pulses from the “OSC” circuit have a duty cycle of 50% and it makes VFM operation allowable.
There might be certain cases that the duty cycles become smaller temporarily at light load current. The output of “EXT2”
is driven by CMOS buffer operated VDD and GND.
A PMOS driver will be connected to the “EXT2” pin and its switching operation generates negative output voltage through
energy accumulated in an inductor.
The DC/DC1 can be shut down by CSW pin. When the CSW pin is High, VDD level, the DC/DC1 is enabled and when the
CSW pin is “L”, GND level, the DC/DC1 is disabled. The EXT2 pin outputs “H” while the DC/DC2 is disabled.
• Set Output Voltage DC/DC 2
VOUT2 is described as follows:
VREF : R1=|–VOUT2| : R2 The FB2 voltage is controlled to 0V and VREF is provided externally
|–VOUT2|=VREF×R2/R1,
thus, any output voltage of DC/DC2 can be set by R1 and R2.
Certain temperature coefficient of VOUT2 can be set by using R1, R2 having such temperature characteristics.
39
RV5VH3××
• Voltage Detector
RV5VH3××
VDD
Pull-up
3
8
R1
DOUT
Output Tr.
+
–
Vref
Tr.1
R2
R3
The Voltage Detector can operate by an input voltage to the VDD pin. The detector threshold and the reset voltage
are internally adjusted by trimmed resistors and the VD monitors VDD pin voltage.
The DOUT is Nch open-drain output and a pull up resistor is necessary.
Oepration Diagram
The output is pulled up to VDD voltage
Step
Step 1
Step 2
Step 3
Step 4
B
Step 5
A
1
2
3
4
5
Comparator(+) Pin
Input Voltage
A
B
B
B
Reset Voltage
+VDET
Hysteresis Range
Detector Threshold –VDET
Comparator Output
Tr. 1
H
L
L
L
H
A
OFF
OFF
ON
ON
ON OFF
GND
Output Tr.
ON Indefinite ON OFF
Output Voltage
R2+R3
R1+R2+R3
R2
×
×
A :
B :
VDD
GND
VDD
R1+R2+R3
Step 1. Output Voltage is equal to Pull-up Voltage
Step 2. When Input voltage(VDD) reaches to the state of VREF≥VDD×(R2+R3)/(R1+R2+R3) at point A, the output of the comparator is reversed, so that the
output voltage becomes to GND.
Step 3. Output Voltage becomes indefinite when Power Source Voltage (VDD) is smaller than Minimum Operating Voltage. When the output is pulIed up,
Output becomes pull-up voltage and GND.
Step 4. Output Voltage becomes to GND.
Step 5. When Input voltage(VDD) reaches to the state of VREF≤VDD×R2/(R1+R2) at point B, the output of the comparator is reversed, so that the output voltage
becomes to pull-up voltage.
40
RV5VH3××
TYPICAL APPLICATION 1
Output DC/DC 1
R3
R5
R6
C5
CSW
FB1
DOUT
FB2
R1
R2
SBD
L1
PMOS
C3
VDD
EXT2
GND
SBD
R4
C4
NPN Tr.
EXT1
Output DC/DC 2
C2
C1
L2
CoiI
Diode
L1 : 100µH, L2 : 100µH
Schottky type
capacitor
C1 : 22µF(Ta), C2 : 22µF(Ta)
C3 : 0.01µF (ceramic)
C4 : 0.01µF (ceramic)
C5 : 0.01µF (ceramic)
2SJ238 (TOSHIBA)
2SK1470 (SANYO)
R1 : 100kΩ , R2 : 0 to 500kΩ
R3 : 100kΩ
PMOS
NMOS
Resistor
R4 : 300Ω
R5 : 0 to 500kΩ, R6 : 50kΩ
41
RV5VH3××
TYPICAL APPLICATION 2
VIN
Output DC/DC 1
R3
R5
R6
C5
CSW
FB1
DOUT
FB2
R1
R2
SBD
L1
PMOS
C3
VDD
EXT2
GND
SBD
R4
C4
NPN Tr.
EXT1
Output DC/DC 2
C2
C1
L2
CoiI
Diode
L1 : 100µH, L2 : 100µH
Schottky type
capacitor
C1 : 22µF(Ta), C2 : 22µF(Ta)
C3 : 0.01µF (ceramic)
C4 : 0.01µF (ceramic)
C5 : 0.01µF (ceramic)
2SJ238 (TOSHIBA)
2SD1628G (SANYO)
R1 : 100kΩ , R2 : 0 to 500kΩ
R3 : 100kΩ
PMOS
NPN Tr.
Resistor
R4 : 300Ω
R5 : 0 to 500kΩ, R6 : 50kΩ
Description
• Step up DC/DC converter : DC/DC1
The oscillator can operate when CSW is “H”. When the CSW is “L” the EXT1 outputs GND.
The output voltage can be adjusted by R5 and R6 with FB1 of two volt.
• Invering DC/DC converter : DC/DC2
The oscillator can operate when CSW is “H”. When the CSW is “L” the EXT2 outputs VDD.
The output voltage can be adjusted by R1 and R2 with FB2 of zero volt.
• VoItage Detector
VDD pin can be monitored. This could be always operated with VDD.
The DOUT pin outputs “L” when low voltage is detected with Nch open-drain output.
42
RV5VH3××
TYPICAL APPLICATION 3
VIN
Output DC/DC 1
R3
CSW
FB1
DOUT
FB2
R1
R5
R6
PMOS
L1
C5
PNP Tr.
SBD1
SBD3
R2
R4
C3
VDD
EXT2
GND
SBD2
C4
EXT1
Output DC/DC 2
C2
NMOS
C1
L2
R1 : 820kΩ, R2 : 820kΩ, R3 : 100kΩ, R4 : 1kΩ, R5 : 750kΩ (AdjustabIe)
R6 : 100kΩ
L1 : 68µH, L2 : 27µH
C1 : 22µF, C2 : 22µF, C3 : 1000pF, C4 : 2200pF, C5 : 1000pF
PMOS : 2SJ238, NMOS : 2SK1470, PNPTr. : 2SB1120F
Operation
The VDD voltage can be supplied from another source than battery output and a reference voltage for DC/DC2 is
supplied by the output of DC/DC1.
The PMOS transistor can operate as a switch when the CSW is “L”.
• Step up DC/DC converter : DC/DC1
The oscillator can operate when CSW is “H”. When the CSW is “L” the EXT1 outputs GND.
The output voltage can be adjusted by R5 and R6 with FB1 of two volt.
• Invering DC/DC converter : DC/DC2
The oscillator can operate when CSW is “H”. When the CSW is “L” the EXT2 outputs VDD.
The output voltage can be adjusted by R1 and R2 with FB2 of zero volt.
• VoItage Detector
VDD pin can be monitored. This could be operated all the time by VDD.
The DOUT pin outputs “L” when low voltage is detected with Nch open-drain output.
43
RV5VH3××
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
2) Efficiency vs. Output Current
VIN=3.6V
VIN=3.6V
100
90
25
20
15
±10V
VOUT±5.0V
80
10
±15V
70
60
50
40
30
5
0
–5
±20V
–10
–15
–20
–25
20
0.0001
0.001
0.01
0.1
0
10
20
Output Current IOUT(A)
Output Current IOUT(mA)
3) CSW Load Transient Responce 1
4) CSW Load Transient Responce 2
VIN=3.6V, IOUT=1mA
VIN=3.6V, IOUT=1mA
20
15
20
15
VOUT1
VOUT1
10
10
CSW
CSW
5
5
0
0
–5
–5
–10
–15
–20
–10
–15
–20
VOUT2
VOUT2
–50
0
50
100
150
200
0
500
1000
1500
Time t(ms)
Time t(ms)
) Please refer to Typical Application.
*
44
RV5VH3××
SELECTION GUIDE
The output voltage, the type of DC/DC1 and the taping type for the ICs can be selected at the user's request.
The selection can be made by designating the part number as shown below:
RV5VH ×××–×× ← Part Number
↑ ↑
↑
a b
c
Code
Contents
DC/DC1 type
1 : Internal LX Driver Transister Type
2 : External EXT Driver Transister Type
3 : Variable Output Voltage Type
a
b
c
Serial (01, 02, 03) Number of Setting DC/DC1 Output Voltage and Setting VD Detect Voltage.
Designation of Taping type
Ex. E1, E2 (refer to Taping Specifications, E2 type is prescribed as a standard.)
45
RV5VH3××
APPLICATION HINTS
When using these ICs, be sure to take care of the following points.
• Set external components as close as possible to the IC and minimize the connection between the
components and the IC. In particular, when an external component is connected to VOUT Pin, make
minimum connection with the capacitor.
• Make sufficient grounding. A large current flows through GND Pin byswitching. When the impedance
of the GND connection is high, the potential within the IC is varied by switching current. This may
result in unstableoperation of the IC.
• Use capacitor with good high frequency characteristics such as tantalum capacitor, aluminium
electrolytic capacitor and ceramic capacitor. We recommend the use of a capacitor with an allowable
voltage which is at least three times the output set voltage. This is because there may be the case
where a spike-shaped high voltage is generated by the inductor when Lx transistor is turned OFF.
• Take the utmost care when choosing an inductor. Namely, choose such an inductor that has
sufficiently small d.c. resistance and large allowable current, and hardly reaches magnetic saturation.
When the inductance value of the inductor is small, there may be the case where ILX exceeds the
absolute maximum ratings at the maximum load. Use an inductor with an appropriate inductance. (See
OUTPUT CURRENT and SELECTION OF PERIPHERAL COMPONENTS sections.)
• Use a diode of a Schottky type with high switching speed, and also take care of the rated current. (See
OUTPUT CURRENT and SELECTION OF PERIPHERAL COMPONENTS sections.)
The performance of power source circuits using these ICs largely depends upon the peripheral components. Take
the utmost care in the selection of the peripheral components. In particular, design the peripheral circuits in such
a manner that the values such as voltage, current and power of each component, PCB patterns and the IC do not
exceed their respective rated values.
46
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