000131
MITSUBISHI(Standard Linear ICs)
M62294FP
3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
DESCRIPTION
M62293FP is 3.3V and 2.5V fixed stable 2-output step-down DC-DC
converter.
It is possible to simplify peripheral circuit and to design compact and low
cost sets because this device includes peripheral devices in small size
8pin package.
The IC also has Reset circuit with time delay that monitors power
supply(Vcc=5V) and one regulator output(Vout1=3.3V;IN1 terminal),
therefore an application system is protected system errors.
Especially this is most suitable for application sysytem with
microprocessor and ASIC.
FEATURES
•3.3V and 2.0V step-down converter
•4 to 15V wide input supply voltage (Vcc=5V typ.)
•Reset circuit with time delay monitors
supply voltage(Vcc=5V)and regulator output (3.3V)
•110kHz fixed frequency oscillator without peripheral devices
•8pin SOP package
APPLICATION
application system with microprocessor and ASIC
( 1 / )
BLOCK DIAGRAM
Cout1
IN1(3.3V) IN2(2.0V)
Cout2
PWM comp.
PWM comp.
comparator
Vcc Cd
GND
RESET
op amp op amp
oscillator
(110kHz)
Vref
1.25V
comparator
IN1;3.3V
25µA
Vcc
(3.3V detect) (Vcc detect)
0.6µA
PIN CONFIGURATION
(
TOP VIEW)
Outline 8P2S-A
1
2
3
4
8
7
6
5
Cout1
GND
Cout2
Vcc
IN1
RESET
Cd
IN2
4
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ABSOLUTE MAXIMUM RATINGS(Ta=25C,unless otherwise noted)
Supply voltage
Output current(DC-DC converter block)
Symbol Parameter Conditions Ratings Unit
Vcc
Io 16 V
mA
Pd Power dissipation 440 mW
KθThermal derating
Topr
Tstg Operating temperature
Storage temperature -20~+85
-40~+125 ºC
ºC
Ta=25ºC
Ta>25ºC 4.4 mW/ºC
30
ch1,ch2
ELECTRICAL CHARACTERISTICS(Ta=25C,Vcc=5V,unless otherwise noted)
Supply voltage
Supply current
Block Parameter Test condition Limits Unit
Vcc
Icc
4.0 V
mA
Output voltage V
mV
Error Amp.
Input current 1
µA
65 KHz
Oscillator Maximum ON duty %
Symbol
Line regulation
Oscillator frequency
Detecting voltage 1
Detecting voltage 2
Without load
Vcc=4~12V
Vreg-L
Iin
fosc
TDUTY
Vs1
Vs2
All
Blocks 15
515
150 450
110 160
90
3.8
2.58
V
mV
Min. Typ. Max.
3.15 3.30 3.45
1.90 2.00 2.10
ch1 output
ch2 output
hysterisys voltage 1
Hysterisys voltage 2
∆Vs1
∆Vs2
Output
V
Cd output currentIPD -0.3 µA
Delay time Cd=4700pFtpd msec
Output leakage current Vcc=12V, Vc=12VICL -1 1V
Output saturation voltage Io=10mA,Darlington connection
Vsat
1.2 2.0 V
Reset
Circuit
mV
RESET LOW voltageVOL
0.2Vo1 V
5.0 2.8
1.5
Vcc=5V detection
ch1output(3.3V)detection
RESET High voltageVOH 0.8Vo1 V
10
3.6 4.0
2.46 2.70
5030 80
5030 80
520
Vcc=5V, Vo=1/2 X VccIOC µA-25-40 -17
Vo1
Vo2
Output current(Reset block)IoRESET mA
6
Reset circuit Block
DC-DC Converter Block
IoRESET=4mA
-1.1 -0.6
Input current 2
µAIin 100 300
ch1
ch2
MITSUBISHI(Standard Linear ICs)
M62294FP
3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
RESET output current
( 2 / )
4
000131
RESET BLOCK timing chart
5V
3.85V
3.80V
3.3V
2.63V
2.58V
td
Vo1
td
td
0V
0V
0V
t
t
t
td : RESET Delay Time ···
td(msec) = 2.13 X 10 X Cd(pF)
-3
MITSUBISHI(Standard Linear ICs)
M62294FP
3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
( 3 / )( 3 / )4
..
000131
APPLICATION CIRCUIT (3.3V and 2.0V 2-output voltage DC-DC converter
IN1 Vcc
Cout1
GND
+
+
M62294FP
VIN(5V)
VOUT1(3.3V)
Cin
Co1 R1 L1 D1
Q1
IN2
+
VOUT2(2.0V)
Co2
R3 L2 D2
Cout2 Q2
3.3V LINE
2.0V LINE
RESET Cd
MCU etc.
R2
R4
note:
·VF : Forward voltage drop of an external diode
·Vsat : Output saturation voltage of an external switching transistor.
·∆IO: Set to 1/3 to 1/5 of maximum output current.
·Choose an external transistor, diode and inductor with peak current rating
approximately greater than "Ipk".
THE EXPRESSION OF CIRCUIT CONSTANTS
Constants
TON
TOFF
(TON+TOFF)MAX
TOFF(MIN)
TON(MAX)
L(MIN)
VO+VF
VIN - VCE(sat) - VO
1
fosc - TOFF
∆Io
( VIN - VCE(sat) - VO ) X TON(MAX)
1
fosc fosc:110KHz(Vcc=5V)
Expressions
Ipk
( TON + T OFF ) / TON
TOFF
1 +
( )
Io + 1
2∆Io
MITSUBISHI(Standard Linear ICs)
M62294FP
3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
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