MDT763022
Step-up DC/DC Converter with Voltage Detector
1 of 4
2005/10/18
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).
2. Features
High output voltage accuracy+/- 2.5%
Low start-up voltage: 0.75V (Typ.)
High efficiency: 85% (Typ.)
3. Applications
Cellular phones, pagers, mcu
Power failure detection
Portable / Battery-Powered Equipment
Palmtops
RF Keyboard / Mouse
4. Pin Function Description
MDT763022
VSS 1
8 LX
CP 2
7 ETR
VDET 3
6 CE
VIN 4
5 VOUT
Pin Name
I/O
Function
VSS
Ground
CP
I/O
External capacitor for
adjusting VDET
output delay time
VDET
Open
Drain
Supply voltage
detector. Output low if
Vin < 2.2V.
VIN
Input
Supply voltage input
LX
Open
Drain
Switching pin
ETR
Output
External switch
transistor drive
CE
Input
Chip enable pin, high
active
VOUT
Input
Output voltage
monitor, IC internal
power supply
O
RDERING INFORMATION
Device
Package
MDT763022P
DIP
MDT763022S
SOP
MDT763022
Step-up DC/DC Converter with Voltage Detector
2 of 4
2005/10/18
5. Electrical Characteristics
+3.0V Output Type
VIN=VOUT0.6 ; 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
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Output Voltage
----------------
2.925
3
3.075
V
Output Ripple
----------------
2.5
3
%
Vin
----------------
6
V
Iout=1mA
0.75
0.8
V
Vstart
Iout=30mA
1
1.2
V
Iout=1mA
0.7
V
Vhold
Iout=30mA 0.9
V
Iin Without
loading
20
25
uA
Supply Current IDD1
VIN=VOUT 0.95
Measured at VOUT pin
without external
component
45
52
uA
Supply Current IDD2
VIN=VOUT+0.5V
Measured at VOUT pin
without external
component
8
12
uA
Shutdown Current
VCE=0 , VIN=VOUT0.95
0.5
uA
LX Leakage
Current
VIN=6V
1
uA
Maximum
Oscillator
Frequency
VIN=VOUT0.95
Measured at ETR pin
200
230 kHz
Oscillator Duty
Cycle
VIN=VOUT_0.95
Measured at ETR pin
70 75 80
%
Low Battery
Detect
Voltage (LBDV)
VIN: HI to LOW
2.1 2.2 2.3
V
LBDV hysteresis
Width
------------------
0.1
V
Efficiency
L , SD , CL etc. connected
85
%
MDT763022
Step-up DC/DC Converter with Voltage Detector
3 of 4
2005/10/18
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)
MDT763022
Step-up DC/DC Converter with Voltage Detector
4 of 4
2005/10/18
7.TYPICAL PERFOMACE OF EFFICIENCY
EFFICIENCY
0
10
20
30
40
50
60
70
80
90
100
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
1
1.5
2
2.5
3
10
20
30
40
50
60
70
80
90
100
mA
V
2.0V
1.8V
1.5V
1.2V
0.9
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