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M62293FP
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.
3.3V and 2.5V 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 system with microprocessor and ASIC
( 1 / )
IN1(3.3V)
IN2(2.5V)
Cout2
Cd
GND
(110kHz)
Vref
1.25V
25µA
Vcc
Outline 8P2S-A
MITSUBISHI(Standard Linear ICs)
3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
PIN CONFIGURATION(TOP VIEW)
FEATURES
●
APPLICATION
BLOCK DIAGRAM
Vcc
Cout1
GND
Cout2
Vcc
1
2
3
4
IN1;3.3V
8
7
6
5
IN1
RESET
Cd
IN2
comparator
(3.3V detect) (Vcc detect)
oscillator
Cout1
op amp op amp
4
RESET
0.6µA
comparator
PWM comp.PWM comp.
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ABSOLUTE MAXIMUM RATINGS(Ta=25C,unless otherwise noted)
Output current(DC-DC converter block)
Symbol
Parameter
Conditions
Ratings
Unit
VccIo16VmAPdPower dissipation
440mWThermal derating
Topr
Tstg
Operating temperature
Storage temperature
-20~+85
-40~+125
˚C˚CTa=25˚C
Ta>25˚C
4.4
mW/˚C
30
ch1,ch2
Supply current
Block
Parameter
Test condition
Limits
Unit
Vcc
Icc
4.0
V-mA
Output voltage
V
mV-Error Amp.
Input current 1
µA65KHz
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
Blocks
15515
150
450
110
160903.8
2.58VmV
Min.
Typ.
Max.
3.15
3.30
3.45
2.37
2.50
2.63
ch1 output
ch2 output
hysterisys voltage 1
Hysterisys voltage 2
Output
V
Cd output current
IPD
-0.3µADelay time
Cd=4700pF
tpd
msec
Output leakage current
Vcc=12V, Vc=12V
ICL-11VOutput saturation voltage
Io=10mA,Darlington connection
Vsat-1.2
2.0
V
Circuit
mV
RESET LOW voltage
VOL-0.2Vo1
V
5.0
2.8
1.5
Vcc=5V detection
ch1output(3.3V)detection
RESET High voltage
VOH
0.8Vo1
V103.6
4.0
2.46
2.70503080503080520
Vcc=5V, Vo=1/2 x Vcc
IOCµA-25
-40
-17
Vo1
Vo2
Output current(Reset block)
IoRESET
mA6Reset circuit Block
DC-DC Converter Block
IoRESET=4mA
-1.1
-0.6
Input current 2
µA
Iin
100
300
ch1
ch2
MITSUBISHI(Standard Linear ICs)
M62293FP
3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
RESET output current
( 2 / )
Supply voltage
Kθ
ELECTRICAL CHARACTERISTICS(Ta=25C,Vcc=5V,unless otherwise noted)
All
Reset
Supply voltage
-
-
- -
-
∆Vs1
∆Vs2
4
-
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5V
3.85V
3.80V
3.3V
2.63V
2.58VtdVo1tdtd0V0V
0V
t
t
M62293FP
3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
( 3 / )( 3 / )
-3
RESET BLOCK timing chart
MITSUBISHI(Standard Linear ICs)
td : RESET Delay Time •••
td(msec) = 2.13 ×10 × Cd(pF)
t
4
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Vcc
Cout1
GND
+
Cin
Co1R1L1D1Q1
R3L2D2
Cd
MCU etc.
R4
approximately greater than "Ipk".
TON
Expressions
Ipk
MITSUBISHI(Standard Linear ICs)
M62293FP
( 4 / )
3.3V, 2.5V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
APPLICATION CIRCUIT (3.3V and 2.5V 2-output voltage DC-DC converter
VIN(5V)
VOUT1(3.3V)
VOUT2(2.5V)
Co2
THE EXPRESSION OF CIRCUIT CONSTANTS
+
+
Constants
TOFF
(TON+TOFF)MAX
TOFF(MIN)
TON(MAX)
L(MIN)
IN1
IN2
RESET
R2
M62293FP
Cout2
3.3V LINE
2.5V LINE
VO+VF
VIN - VCE(sat) - VO
1
fosc
( TON + TOFF) /
( VIN - VCE(sat) - VO ) x TON(MAX)
fosc:110KHz(Vcc=5V)
TON
1 +
1
fosc
Io +
(
- TOFF
∆Io
1
∆Io
2
TOFF
Q2
)
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
4
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