MDT7733
Step-up DC/DC Converter
1.General Description
4. Pin Function Description
MDT7733 is a step-up DC/DC converter .
It has low start-up voltage and a high output
voltage accuracy with low ripple.
MDT7733
1
2
VOUT
3
LX
2. Features
●
●
●
VSS
High output voltage accuracy：+/- 2.5%
Low start-up voltage: 0.75V (Typ.)
High efficiency: 85% (Typ.)
Pin Name
VSS
LX
VOUT
I/O
Function
Ground
3. Applications
●
●
●
●
●
Cellular phones, pagers, mcu
Power failure detection
Portable / Battery-Powered Equipment
Palmtops
RF Keyboard / Mouse
Open
Switching pin
Drain
Input
Output voltage
monitor, IC internal
power supply
ORDERING INFORMATION
Device
MDT7733ST
Package
SOT89
1 of 4
2005/10/18
MDT7733
Step-up DC/DC Converter
5. Electrical Characteristics
Parameter
Output Voltage
Output Ripple
Vin
Vstart
Vhold
Iin
Supply Current IDD1
Test Conditions
Min.
----------------
3.225
----------------
----------------
Iout=1mA
Iout=30mA
Iout=1mA
0.7
Iout=30mA
1
Without loading
VIN=VOUT × 0.95
Measured at VOUT pin
without external component
VIN=VOUT+0.5V
Measured at VOUT pin
without external component
VCE=0 , VIN=VOUT×0.95
VIN=6V
VIN=VOUT0.95
Measured at ETR pin
70
VIN=VOUT_0.95
Measured at ETR pin
L , SD , CL etc. connected
Typ.
3.3
±2.5
0.75
1.1
Max.
3.375
±3
6
0.8
1.2
Unit
V
%
V
V
V
V
V
uA
uA
20
45
25
52
Supply Current IDD2
8
12
uA
Shutdown Current
LX Leakage Current
Maximum Oscillator
Frequency
Oscillator Duty Cycle
200
75
0.5
1
230
80
uA
uA
kHz
%
%
85
Efficiency
+3.3V 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
MDT7733
Step-up DC/DC Converter
6.Application Circuit
EXTERNAL COMPONENT : Cin=100uF ; CL=100uF ; Cb=0.1uF
L=100uH
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
%
3 of 4
2005/10/18
MDT7733
Step-up DC/DC Converter
8. OUTPUT VOLTAGE V.S LOADING
LOADING v.s OUTPUT VLOTAGE
3.5
3.25
3
2.75
2.5
2.25
2
1.75
1.5
1.25
1
10
20
30
40
50
mA
60
70
80
90
100
2.0V
1.8V
1.5
1.2
0.9V
V
4 of 4
2005/10/18
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