CYT2606L
PFM Step-Up DC-DC Converter
General Description
The CYT2606L Series are PFM step-up DC-DC
converters with very low ripple noise due to the
high operation frequency. The maximum
operation frequency is 400KHz.
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
400KHz Maximum Operation Frequency
2.0V to 5.0V Output Voltage With 0.1V Step
Low Start-up Voltage: 0.8V at 1mA
±2%
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
Applications
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, pagers and hand held
communication instrument
Ordering Information
Typical Applications
1 of 1
CYT2606L
Absolute Maximum Ratings
Type
Voltage
Symbol
Vmax
Vmin-max
Current
ILXmax
IEXTmax
Power dissipation
Psot-23-3
Psot-23-5
Psot-89
Thermal
Tmin-max
Tstorage
ESD
VESD
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
Maximum Power dissipation for SOT-23-3 package
Maximum Power dissipation for SOT-23-5 package
Maximum Power dissipation for SOT-89 package
Operation temperature range
Storage temperature range
ESD voltage for human body mode
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
C
C
o
V
Electronic Characteristics
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
VIN=1.8V VOUT=3.0V
VIN=1.8V VOUT=5.0V
Input standby current
EN “High” voltage level
EN “low” level
EN “high” input current
EN “low” input current
EXT output current
-0.1
-5
5
IINQ
No load, EN=“low”
0.4*VOUT
0.2
0.1
600
ILOAD=1mA, VIN:0→2V
ILOAD=1mA, VIN:2→0V
0.6
350
75
400
80
85
800
20
25
1
450
85
88
1000
Test Condition
Min
-2
0.7
Typ
Max
2
VOUT
0.85
Unit
%
V
V
V
KHz
%
%
mA
uA
uA
uA
V
V
uA
uA
mA
3 of 3
CYT2606L
Typical Characteristics (Using Internal Switch Transistor)
Start-up/Hold-on vs. Output Current
Start-up/Hold-on Voltage(V)
3
2.5
2
1.5
1
0.5
0
1
10
100
Output Current(mA)
1000
Start-up
Hold-on
L=47uH
C=47uF
Output Voltage vs. Output Current
4
3.5
Output Voltage (V)
2V
2.5V
3V
3
1.5V
2.5
2
1.5
0
50
1V
L=47uH
C=47uF
VOUT=3.4
V
100
150
200
250
300
350
Output Current (mA)
4 of 4
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