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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
DESCRIPTION
M62212 is designed as a general purpose DC-DC converter. This small 8 pin package contains many functions allowing simpler peripheral circuits and compact set design. The output transistor is open collector and emitter follower type. This makes the control STEP-UP,STEP-DOWN and INVERTING converter.
PIN CONFIGURATION(TOP VIEW)
Collector output 1 Emitter 2 output GND 3 4
8 7 6 5
VCC IN FB DTC
M62212P / FP / GP
FEATURE
• Wide operation power supply voltage range •••••••2.5 ~ 18V • Low power consumption••••••••••••••••••••••••1.3mA typ • High speed switching is possible.(300kHz) • Output short protection circuit and ON/OFF control are used. The dead-time control and the soft-start operation are possible • Package variation : 8pin DIP/SOP/SSOP8
Cosc
OUTLINE 8P2S-A (FP) 8P2X (GP) 8P4 (P)
APPLICATIONS
General electric products, DC-DC converter
BLOCK DIAGRAM
VCC 8
UVLO VTH : 2.3V
Collector output
COSC 4
OSC
VCC
PWM Comp
1
2
Emitter output
OP Amp
IN 7
1.25V VCC 1.86V
Short protection circuit
1.25V
R S Q 1.15V 0.3V
6 FB
5 DTC
3 GND
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted) Symbols
Vcc Vo Io Pd Ktheta Topr Tstg
Items
Power supply voltage Output voltage Output current Power dissipation Thermal derating ratio Operating ambient temperature Storage temperature
Conditions
Ratings
19 19 150
Units
V V mA mW °C °C
Ta=25°C Ta>25°C
625 (P) 360(FP) 250(GP) -20°C ~ +85 -40°C ~ +125
5.00 (P) 2.88 (FP) 2.00(GP) mW/°C
Electrical Characteristics ( Ta=25°C, Vcc =12V, Cosc=100pF unless otherwise noted ) Block
All device Std. voltage section
Symbol
VCC I CC ST V REF L INE IB AV
Items
Range of power supply voltage Standby current Standard voltage Line regulation Input bias current Open loop gain Unity gain bandwidth
Test condition
Limits
Min 2.5 Typ 1.3 1.19 1.25 5 80 0.6 1.82 6 -60 110 1.0 0.45 -40 10 -30 2.62 400 Max 18 1.8 1.31 12 500
Units
V mA V mV nA dB MHz V mV mA uA kHz V V uA uA
Output "OFF" status
Voltage follower VCC=2.5 ~ 18V
Error amp. section
GB VOM VOM I OM I OM + + -
Output high voltage Output low voltage Output sink current Output source current Oscillation frequency
Upper limit voltage of oscillation waveform Lower limit voltage of oscillation waveform
VFB=1.86V VIN =1V
f OSC
Oscillator section
VOSCH VOSCL I OSC CH I OSC DIS1 VTH ON
Cosc charge current Cosc discharge current 1 Start-up threshold voltage Shut-down threshold voltage Hysteresis
VIN =1V VIN =1V VHYS = VTHON - VTHOFF 20 2.2
2.3 2.25 50
2.4
V V
UVLO section
VTH OFF VHYS
80
mV
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
Electrical Characteristics ( Ta=25°C, Vcc =12V, Cosc=100pF unless otherwise noted ) Block Symbol
VTH FB VTH DTC
Items
FB threshold voltage Latch mode "H" threshold voltage Latch mode "L" threshold voltage DTC charge current when start-up DTC discharge current 1
Test condition
VIN =1V,VDTC=0.7V VIN =1V,VFB =2.11V VIN =1V,VFB =2.11V VDTC=0.7V,VFB =2.11V VDTC=0.7V,VFB =2.11V
Limits
Min Typ
1.86 1.15 0.3 -45 50 -10 15 -1 0.3 1.6 1 1.1
Max
Units
V V V µA µA µA µA µA V V
Short protection circuit
VTL DTC I CH1 I DIS1 I CH2 I DIS2 I CL
DTC charge current when stable state VDTC=0.7V,VFB = 0.7V DTC discharge current 2
VDTC=0.2V,VFB =2.11V
Output section
Collector output leak current
Collector output saturation voltage 1 Collector output saturation voltage 2
VCE=18V , VCC=18V
Emitter GND, IC=150mA,VE=0V Emitter follower, IE=50mA,VC=12V
VSAT1 VSAT2
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
1. Application Circuit (STEP-DOWN converter with current buffer transistor)
L
VIN
CIN
8 1
VOUT
D R1 R2
4
COUT
COSC
7 6
M62212
2
5
3
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
2. FUNCTION DESCRIPION
1) Soft Start (The peripheral circuit is shown in Fig.1) When the power is turned ON, input terminal IN is at 0V level. Therefore, the FB terminal is fixed to High level. The DTC terminal goes up gradually starting from 0V due to the internal charge current and the external CDTC. When the level of DTC terminal reaches the lower limit of the triangular wave of the oscillator, PWM comparator and the output circuit go into operation causing the output voltage, "Vo" of the DC-DC converter to rise. The charge current is designed to be approximately 45µA.
FB DTC 1.0V OSC 0.45V
OFF
External Tr collector
ON
Fig.2
2) DTC The dead time control is set by installing a resistor between the DTC terminal and GND. However, the DTC terminal serves as the short protection circuit also. Therefore, its set up depends on whether the short protection circuit is used and not. (When the short protection circuit is used.