MDT762720
Step-up DC/DC Converter with Voltage Detector
4. Pin Function Description
1.General Description
MDT762720
MDT762720 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 (2.0v).
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 < 2.0V.
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
ETR
CE
VOUT
3. Applications
●
●
●
●
●
Cellular phones, pagers, mcu
Power failure detection
Portable / Battery-Powered Equipment
Palmtops
RF Keyboard / Mouse
ORDERING
INFORMATION
Device
MDT762720P
MDT762720S
Package
DIP
SOP
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
MDT762720
Step-up DC/DC Converter with Voltage Detector
5. Electrical Characteristics
Parameter
Output Voltage
Output Ripple
Vin
Vstart
Vhold
Iin
Supply Current IDD1
Test Conditions
----------------
----------------
----------------
Iout=1mA
Iout=30mA
Iout=1mA
Iout=30mA
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
VIN=VOUT_0.95
Measured at ETR pin
VIN: HI to LOW
Min.
Typ.
2.6325
2.7
±2.5
0.75
1
0.7
0.9
20
45
25
52
Max.
2.765
±3
6
0.8
1.2
Unit
V
%
V
V
V
V
V
uA
uA
Supply Current IDD2
8
12
uA
Shutdown Current
LX Leakage Current
Maximum Oscillator
Frequency
Oscillator Duty Cycle
200
70
75
0.5
1
230
80
uA
uA
kHz
%
V
V
%
1.9
2.0
2.1
Low Battery Detect
Voltage (LBDV)
0.1
LBDV hysteresis
------------------
Width
85
Efficiency
L , SD , CL etc. connected
+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
MDT762720
Step-up DC/DC Converter with Voltage Detector
6.Application Circuit & Block Diagram
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
MDT762720
Step-up DC/DC Converter with Voltage Detector
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)
This specification are subject to be changed without notice. Any latest information please preview
P.4
2006/11
http;//www.mdtic.com.tw
Ver 1.1
MDT762720
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
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
60
70
80
90
100
1.8V
1.5
1.2V
0.9V
This specification are subject to be changed without notice. Any latest information please preview
P.5
2006/11
http;//www.mdtic.com.tw
%
Ver 1.1
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