MDT763022
Step-up DC/DC Converter with Voltage Detector
1.General Description
MDT763022 is a step-up DC/DC
converter with supply voltage detector.
It has low start-up voltage and a high
output voltage accuracy with low ripple.
The device generates a low
level signal whenever the input
voltage (supply voltage) falls below
threshold voltage level (2.2v).
4. Pin Function Description
MDT763022
VSS 1
CP 2
VDET 3
VIN 4
Pin Name
VSS
CP
I/O
I/O
8 LX
7 ETR
6 CE
5 VOUT
Function
Ground
External capacitor for
adjusting VDET
output delay time
2. Features
●
●
●
High output voltage accuracy：+/- 2.5%
Low start-up voltage: 0.75V (Typ.)
High efficiency: 85% (Typ.)
VDET
Open
Supply voltage
Drain
detector. Output low if
Vin < 2.2V.
Input
Supply voltage input
Open
Switching pin
Drain
Output
External switch
transistor drive
Input
Input
Chip enable pin, high
active
Output voltage
monitor, IC internal
power supply
VIN
LX
3. Applications
●
●
●
●
●
Cellular phones, pagers, mcu
Power failure detection
Portable / Battery-Powered Equipment
Palmtops
RF Keyboard / Mouse
ETR
CE
VOUT
ORDERING
INFORMATION
Device
MDT763022P
MDT763022S
Package
DIP
SOP
1 of 4
2005/10/18
MDT763022
Step-up DC/DC Converter with Voltage Detector
5. Electrical Characteristics
Test Conditions
Min.
----------------
2.925
----------------
----------------
Iout=1mA
Iout=30mA
Vhold
Iout=1mA
0.7
Iout=30mA
0.9
Iin
Without loading
Supply Current IDD1 VIN=VOUT × 0.95
Measured at VOUT pin
without external
component
Supply Current IDD2 VIN=VOUT+0.5V
Measured at VOUT pin
without external
component
Shutdown Current VCE=0 , VIN=VOUT×0.95
LX Leakage
VIN=6V
Current
Maximum
VIN=VOUT0.95
Oscillator
Measured at ETR pin
Frequency
Oscillator Duty VIN=VOUT_0.95
70
Cycle
Measured at ETR pin
Parameter
Output Voltage
Output Ripple
Vin
Vstart
Typ.
3
±2.5
0.75
1
Max.
3.075
±3
6
0.8
1.2
Unit
V
%
V
V
V
V
V
uA
uA
20
45
25
52
8
12
uA
0.5
1
200
75
230
80
uA
uA
kHz
%
Low Battery
VIN: HI to LOW
2.1
2.2
2.3
V
Detect
Voltage (LBDV)
LBDV hysteresis
------------------
0.1
V
Width
85
%
Efficiency
L , SD , CL etc. connected
+3.0V Output Type
VIN=VOUT×0.6 ; IOUT=30mA ; Ta=25℃ (Unless otherwise specified)
Note:
" Supply current 1 " is the supply current while the oscillator is continuously oscillating. In
actual operation the oscillator periodically operates. The current actually provided by an
external VIN source from VOUT pin.
" Supply current 2 " is the supply current while the oscillator stop oscillating. In actual
operation the oscillator periodically operates. The current actually provided by an external
VIN source from VOUT pin
2 of 4
2005/10/18
MDT763022
Step-up DC/DC Converter with Voltage Detector
6.Application Circuit
EXTERNAL COMPONENT : CP=22uF ; CIN=100uF ; CL=100uF ; Cb=0.1uF
L=100uH ; RPU=47K
External Transistor application ------using
N-Channel Power MOS FET
(1A)
3 of 4
2005/10/18
MDT763022
Step-up DC/DC Converter with Voltage Detector
7.TYPICAL PERFOMACE OF EFFICIENCY
EFFICIENCY
100
90
80
70
60
50
40
30
20
10
0
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
mA
2.0V
1.8V
1.5V
1.2V
0.9V
8. OUTPUT VOLTAGE V.S LOADING
OUTPUT VOLTAGE V.S OUTPUT CURRENT
%
3
2.5
V
2
1.5
1
10
20
30
40
50
mA
60
70
80
90
100
2.0V
1.8V
1.5V
1.2V
0.9
4 of 4
2005/10/18
51单片机
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