MDT7727
Step-up DC/DC Converter
4. Pin Function Description
1.General Description
MDT7727ST
MDT7727 is a step-up DC/DC converter .
It has low start-up voltage and a high output
voltage accuracy with low ripple.
1
VSS
2
VOUT
3
LX
2. Features
●
●
●
MDT7727ST23
VOUT
3
High output voltage accuracy：+/- 2.5%
Low start-up voltage: 0.75V (Typ.)
High efficiency: 85% (Typ.)
1
VSS
2
LX
3. Applications
●
●
●
●
●
Cellular phones, pagers, mcu
Power failure detection
Portable / Battery-Powered Equipment
Palmtops
RF Keyboard / Mouse
Pin Name
VSS
LX
VOUT
I/O
Function
Ground
Open
Switching pin
Drain
Input
Output voltage
monitor, IC internal
power supply
ORDERING INFORMATION
Device
MDT7727ST
MDT7727ST23
Package
SOT89
SOT23
This specification are subject to be changed without notice. Any latest information please preview
P.1
2006/11
http;//www.mdtic.com.tw
Ver 1.1
MDT7727
Step-up DC/DC Converter
5. Electrical Characteristics
Parameter
Output Voltage
Output Ripple
Vin
Vstart
Vhold
Iin
Supply Current IDD1
Test Conditions
Min.
----------------
2.6325
----------------
----------------
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.
2.7
±2.5
0.75
1.1
Max.
2.7675
±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
+2.7V 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
This specification are subject to be changed without notice. Any latest information please preview
P.2
2006/11
http;//www.mdtic.com.tw
Ver 1.1
MDT7727
Step-up DC/DC Converter
6.Application Circuit & Block Diagram
EXTERNAL COMPONENT : Cin=100uF ; CL=100uF ; Cb=0.1uF
L=100uH
This specification are subject to be changed without notice. Any latest information please preview
P.3
2006/11
http;//www.mdtic.com.tw
Ver 1.1
MDT7727
Step-up DC/DC Converter
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
LOADING v.s OUTPUT VOLTAGE
3.1
2.6
2.0V
2.1
V
1.6
1.1
0.6
10
20
30
40
50
mA
This specification are subject to be changed without notice. Any latest information please preview
P.4
2006/11
http;//www.mdtic.com.tw
%
1.8V
1.5
1.2V
0.9V
60
70
80
90
100
Ver 1.1
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