CYT 2606
PFM Step-Up DC-DC Converter
General Description
The CYT2606 Series are PFM step-up
DC-DC converters with very low ripple noise
due to the high operation frequency. The
maximum operation frequency is 260KHz.
Only three components are required to
realize the conversion from the battery voltage
to a selected output voltage.
A driver pin (EXT) is provided for driving
external power transistor to extend the output
current capability where large current is
required. Enable pin (EN) is also provided so
that the circuit can be powered down.
Features
■
■
■
■
■
■
■
■
■
260KHz Maximum Operation Frequency
2.0V to 5.0V Output Voltage With 0.1V Step
Low Start-up Voltage: 0.8V at 1mA
±2.5%
Output Voltage Accuracy
Up to 88% Efficiency
Output current: 300mA at 2.5V input, 3.3V
output
Low Ripple and Low Noise
Output Current Extendable by External
Switch
RoHS Compliant and 100% Lead (Pb)-Free
Applications
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Power source for applications where a higher
voltage than the battery voltage is required
One to three cell battery devices
Power source for cameras
camcorders
VCRs, PDAs, LED and hand held
communication instrument
SOT-23-5 Package
SOT-89
Package
ShenZhen CYT IC Design CO ,Ltd
1
Revision 12/4/2007
All contents are subject to change without prior notice.
CYT 2606
Pin Assignment
Pin
Name
LX
EXT
VOUT
EN
GND
NC
Part Marking and Package Type
CYT2606
LXXT
CYT2606
LXXF
CYT2606
LXXE
CYT2606
EXXT
CYT2606
EXXF
CYT2606
EXXE
Description
Switching pin
Buffer output for external transistor
Output voltage
Chip enable (active high)
Ground
No connection
2
-
3
-
1
-
5
-
2
1
4
3
3
-
2
-
1
-
-
2
3
-
1
-
-
5
2
1
4
3
-
3
2
-
1
-
Absolute Maximum Ratings
Type
Symbol
Vmax
Description
Maximum voltage on VOUT and VLX pins
Voltage range on EXT and EN pins
Maximum current on LX pin
Maximum current on EXT pin
Value
8
-0.3-VOUT+0.3
1000
100
0.25
0.25
0.5
-20-85
-40-165
2000
Unit
V
V
mA
mA
W
W
W
o
Voltage
Vmin-max
ILXmax
Current
IEXTmax
Power
dissipation
Psot-23-3 Maximum Power dissipation for SOT-23-3 package
Psot-23-5 Maximum Power dissipation for SOT-23-5 package
Psot-89
Tmin-max
Maximum Power dissipation for SOT-89 package
Operation temperature range
Storage temperature range
ESD voltage for human body mode
C
C
Thermal
Tstorage
o
ESD
VESD
V
ShenZhen CYT IC Design CO ,Ltd
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Revision 12/4/2007
All contents are subject to change without prior notice.
CYT 2606
Electrical Characteristics
V
IN
= 5V; I
OUT
= 10mA, C
IN
= 2.2µF; C
OUT
= 2.2µF;
TJ = 25°C; unless otherwise specified.
Parameter
Output voltage accuracy
Maximum input voltage
Start-up voltage
Hold-on voltage
Maximum oscillation frequency
Oscillator duty cycle
Efficiency
Current limit
Input current at no load
Symbol
△
VOUT
VIN
MAX
V
START
V
HOLD
F
MAX
DC
OSC
η
I
LIMIT
IIN0
Test Condition
Min
-2
0.7
Typ Max Unit
2
VOUT
0.85
%
V
V
V
260
80
85
280
85
88
1000
KHz
%
%
mA
uA
uA
1
uA
V
0.2
0.1
V
uA
uA
5
mA
ILOAD=1mA, VIN:0→2V
ILOAD=1mA, VIN:2→0V
0.6
220
75
600
VIN=1.8V VOUT=3.0V
VIN=1.8V VOUT=5.0V
800
20
25
Input standby current
EN “High” voltage level
EN “low” level
EN “high” input current
EN “low” input current
EXT output current
IINQ
No load, EN=“low”
0.4*VOUT
-0.1
-5
ShenZhen CYT IC Design CO ,Ltd
5
Revision 12/4/2007
All contents are subject to change without prior notice.
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