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M62294FP
3.3 V, 2.0 V Fixed 2-Output Voltage DC/DC Converter
REJ03D0854-0200 Rev.2.00 Jun 14, 2006
Description
M62294FP is 3.3 V and 2.0 V 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 8-pin package. The IC also has Reset circuit with time delay that monitors power supply (VCC = 5 V) and one regulator output (Vout1 = 3.3 V; IN1 terminal), therefore an application system is protected system errors. Especially this is most suitable for application system with microprocessor and ASIC.
Features
* * * * * * 3.3 V and 2.0 V step-down converter 4 to 15 V wide input supply voltage (VCC = 5 V typ.) Reset circuit with time delay monitors Supply voltage (VCC = 5 V) and regulator output (3.3 V) 110 kHz fixed frequency oscillator without peripheral devices 8-pin SOP package
Application
Application system with microprocessor and ASIC
Block Diagram
VCC 4 Cd 6 IN1; 3.3 V 25 A Vref 1.25 V + - Comparator (3.3 V detect) + - Comparator (VCC detect) 0.6 A 7 RESET +
Oscillator (110 kHz)
VCC
Cout1 1
- + PWM comp. + - OP Amp 8 IN1 (3.3 V) 5 IN2 (2.0 V) + - OP Amp
- + PWM comp.
3 Cout2
2 GND
Rev.2.00 Jun 14, 2006 page 1 of 6
M62294FP
Pin Arrangement
M62294FP Cout1 GND Cout2 VCC 1 2 3 4 (Top view) Outline: PRSP0008DA-A (8P2S-A) 8 7 6 5 IN1 RESET Cd IN2
Rev.2.00 Jun 14, 2006 page 2 of 6
M62294FP
Absolute Maximum Ratings
(Ta = 25C, unless otherwise noted)
Item Supply voltage Output current (DC/DC converter block) Output current (Reset block) Power dissipation Thermal derating Operating temperature Storage temperature Symbol VCC IO IORESET Pd K Topr Tstg Ratings 16 30 6 440 4.4 -20 to +85 -40 to +125 Unit V mA mA mW mW/C C C Conditions ch1, ch2 Ta = 25C Ta > 25C
Electrical Characteristics
(Ta = 25C, VCC = 5 V, unless otherwise noted)
Block All Blocks Item Supply voltage Supply current Symbol VCC ICC VO1 VO2 Vreg-L Iin Iin fOSC TDUTY ICL Vsat Min 4.0 3.15 1.90 65 -1 Limits Typ 5.0 1.5 3.30 2.00 5 150 100 110 90 1.2 Max 15 2.8 3.45 2.10 15 450 300 160 1 2.0 Unit V mA V mV A A kHz % V V VCC = 12 V, VC = 12 V IO = 10 mA, Darlington connection VCC = 5 V detection ch1 output (3.3 V) detection Test Condition Without load ch1 output ch2 output VCC = 4 to 12 V ch1 ch2
DC/DC converter block Error Output voltage Amp. Line regulation Input current 1 Input current 2 Oscillator Output Oscillator frequency Maximum on duty Output leakage current Output saturation voltage Reset circuit block Reset Detecting voltage 1 circuit Hysteresis voltage 1 Detecting voltage 2 Hysteresis voltage 2 Cd output current Delay time RESET output current RESET low voltage RESET high voltage
Vs1 Vs1 Vs2 Vs2 IPD tpd IOC VOL VOH
3.6 30 2.46 30 -1.1 5 -40 0.8 VO1
3.8 50 2.58 50 -0.6 10 -25
4.0 80 2.70 80 -0.3 20 -17 0.2 VO1
V mV V mV A ms A V V
Cd = 4700 pF VCC = 5 V, VO = 1/2 x VCC IORESET = 4 mA
Rev.2.00 Jun 14, 2006 page 3 of 6
M62294FP
Reset Block Timing Chart
5V 3.85 V 3.80 V
VCC
0V
t
ch1 output (VO1)
3.3 V 2.63 V 2.58 V
0V
t
RESET output
VO1
tpd 0V
tpd
tpd
t
-3
note:
tpd: RESET delay time*******************tpd (ms) 2.13 x 10 x Cd (pF)
Rev.2.00 Jun 14, 2006 page 4 of 6
M62294FP
Application Circuit (3.3 V and 2.0 V 2-output Voltage DC/DC Converter)
VIN (5 V) +
Cin 4
VOUT1 (3.3 V) Co1 + 8 IN1
VCC
R2 Cout1 1 R1
Q1 D1 L1 R4
M62294FP VOUT2 (2.0 V) Co2 + 5 IN2 RESET 7 Cd 6 GND 2 Cout2 3
Q2 D2
R3 L2
3.3 V Line 2.0 V Line
MCU etc.
The Expression of Circuit Constants
Constants
TON TOFF (TON + TOFF) MAX TOFF (MIN) TON (MAX) L (MIN) lpk
Expressions
VO + VF VIN - VCE (sat) - VO 1 fOSC: 110 kHz (VCC = 5 V) fOSC (TON + TOFF) / ( 1 + 1 - TOFF fOSC (VIN - VCE (sat) - VO) x TON (MAX) lO lO + 1 lO 2 TON TOFF )
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".
Rev.2.00 Jun 14, 2006 page 5 of 6
M62294FP
Package Dimensions
JEITA Package Code P-SOP8-4.4x5-1.27 RENESAS Code PRSP0008DA-A Previous Code 8P2S-A MASS[Typ.] 0.07g
8
5
HE
*1
E
F
1
Index mark
4
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
c
A2 A1
*2
D
Reference Symbol
Dimension in Millimeters
*3 e y
bp
D E A2 A1 A bp c HE e y L
Detail F
Min Nom Max 4.8 5.0 5.2 4.2 4.4 4.6 1.5 0.05 1.9 0.35 0.4 0.5 0.13 0.15 0.2 0 10 5.9 6.2 6.5 1.12 1.27 1.42 0.1 0.2 0.4 0.6
A
Rev.2.00 Jun 14, 2006 page 6 of 6
L
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