MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>
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
V
CC
8
UVLO
V
TH
: 2.3V
Collector
output
C
OSC
4
OSC
V
CC
PWM Comp
1
2
Emitter
output
OP Amp
IN 7
1.25V
V
CC
1.86V
Short protection
circuit
1.25V
R
S Q
1.15V
0.3V
6
FB
5
DTC
3
GND
(1/8)
MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>
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
V
CC
I
CC ST
V
REF
L
INE
I
B
A
V
Items
Range of power supply voltage
Standby current
Standard voltage
Line regulation
Input bias current
Open loop gain
Unity gain bandwidth
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
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
V
CC
=2.5 ~ 18V
Error
amp.
section
G
B
V
OM
+
V
OM
-
+
I
OM
I
OM
-
f
OSC
V
FB
=1.86V
V
IN
=1V
Oscil-
lator
section
V
OSCH
V
OSCL
I
OSC CH
I
OSC DIS1
V
TH ON
Cosc charge current
Cosc discharge current 1
Start-up threshold voltage
Shut-down threshold voltage
Hysteresis
V
IN
=1V
V
IN
=1V
V
HYS
= V
THON
- V
THOFF
20
2.2
2.3
2.25
50
2.4
V
V
UVLO
section
V
TH OFF
V
HYS
80
mV
(2/8)
MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
Electrical Characteristics (
Ta=25°C, Vcc =12V, Cosc=100pF unless otherwise noted
)
Block
Symbol
V
TH FB
V
TH 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
V
IN
=1V,V
DTC
=0.7V
V
IN
=1V,V
FB
=2.11V
V
IN
=1V,V
FB
=2.11V
V
DTC
=0.7V,V
FB
=2.11V
V
DTC
=0.7V,V
FB
=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
pro-
tection
circuit
V
TL DTC
I
CH1
I
DIS1
I
CH2
I
DIS2
I
CL
DTC charge current when stable state
V
DTC
=0.7V,V
FB
= 0.7V
DTC discharge current 2
V
DTC
=0.2V,V
FB
=2.11V
Output
section
Collector output leak current
Collector output saturation voltage 1
Collector output saturation voltage 2
V
CE
=18V , V
CC
=18V
Emitter GND,
I
C
=150mA,V
E
=0V
Emitter follower,
I
E
=50mA,V
C
=12V
V
SAT1
V
SAT2
(3/8)
MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
1. Application Circuit (STEP-DOWN converter with current buffer transistor)
L
V
IN
C
IN
8
1
V
OUT
D
R1
R2
4
C
OUT
C
OSC
7
6
M62212
2
5
3
(4/8)
MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>
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 C
DTC
.
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)
At this time, the charge current for DTC is approximately 10µA . Therefore, R
DTC
should
be set to 40KΩ ~ 110KΩ.
(When the short protection circuit is not used)
At this time, the charge current for DTC is approximately 45µA. Therefore, R
DTC
is set to
12KΩÅ`25KΩ.
(5/8)
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