ETC2 CYT2606E21E Pfm step-up dc-dc converter Datasheet

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.
Ordering Information
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
Typical Applications
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CYT2606L
Block Diagram
+
LX
EXT
EN
Current
limiting
comparator
buffer
VOUT
Error
Amplifier
+
-
PFM
control
1.24V
OSC
400KHz
Chip
Enable
bandgap
GND
Pin Assignment
Pin
Name
Part Marking and Package Type
CYT2606L
CYT2606L
CYT2606L
CYT2606L
CYT2606L
CYT2606L
Description
LXXT
LXXF
LXXE
EXXT
EXXF
EXXE
SOT-23-3
SOT-23-5
SOT-89
SOT-23-3
SOT-23-5
SOT-89
LX
2
5
3
-
-
-
Switching pin
EXT
-
-
-
2
5
3
Buffer output for external transistor
VOUT
3
2
2
3
2
2
Output voltage
EN
-
1
-
-
1
-
Chip enable (active high)
GND
1
4
1
1
4
1
Ground
NC
-
3
-
-
3
-
No connection
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CYT2606L
Absolute Maximum Ratings
Type
Symbol
Description
Value
Unit
Voltage
Vmax
Maximum voltage on VOUT and VLX pins
8
V
Vmin-max
Voltage range on EXT and EN pins
-0.3-VOUT+0.3
V
ILXmax
Maximum current on LX pin
1000
mA
IEXTmax
Maximum current on EXT pin
100
mA
Psot-23-3
Maximum Power dissipation for SOT-23-3 package
0.25
W
Psot-23-5
Maximum Power dissipation for SOT-23-5 package
0.25
W
Psot-89
Maximum Power dissipation for SOT-89 package
0.5
W
Tmin-max
Operation temperature range
-20-85
o
C
Tstorage
Storage temperature range
-40-165
o
C
VESD
ESD voltage for human body mode
2000
V
Current
Power dissipation
Thermal
ESD
Electronic Characteristics
Parameter
Symbol
Output voltage accuracy
△VOUT
Maximum input voltage
VINMAX
Start-up voltage
VSTART
ILOAD=1mA, VIN:0→2V
Hold-on voltage
VHOLD
ILOAD=1mA, VIN:2→0V
Maximum oscillation frequency
FMAX
350
400
450
KHz
Oscillator duty cycle
DCOSC
75
80
85
%
Efficiency
η
85
88
%
Current limit
ILIMIT
800
1000
mA
Input current at no load
IIN0
Input standby current
EN “High” voltage level
IINQ
Test Condition
Min
Typ
Max
Unit
-2
2
%
0.7
VOUT
V
0.85
V
0.6
600
V
VIN=1.8V VOUT=3.0V
20
uA
VIN=1.8V VOUT=5.0V
25
uA
No load, EN=“low”
1
uA
V
0.4*VOUT
EN “low” level
0.2
V
EN “high” input current
0.1
uA
EN “low” input current
-0.1
EXT output current
-5
uA
5
mA
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CYT2606L
Typical Characteristics (Using Internal Switch Transistor)
Start-up/Hold-on Voltage(V)
Start-up/Hold-on vs. Output Current
3
2.5
2
1.5
Start-up
1
0.5
L=47uH
C=47uF
Hold-on
0
1
10
100
1000
Output Current(mA)
Output Voltage vs. Output Current
4
Output Voltage (V)
3.5
3V
2V
2.5V
3
1.5V
2.5
1V
L=47uH
C=47uF
VOUT=3.4
V
2
1.5
0
50
100
150
200
250
300
350
Output Current (mA)
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CYT2606L
Efficiency(%)
Efficiency vs. Output Current
90
88
86
84
82
80
78
76
74
72
3V
2.5V
2V
1V
1
1.5V
10
L=47uH
C=47uF
VOUT=3.4V
100
1000
Output Current(mA)
Output Current vs. Ripple Voltage
Ripple Voltage(mV)
250
200
3V
150
2.5V
2V
100
50
L=47uH
C=47uF
VOUT=3.4V
1.5V
1V
0
0
50
100
150
200
250
300
350
Output Current (mA)
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CYT2606L
Output Current vs. Ripple Voltage
Ripple Voltage (mV)
80
70
2V
60
3V
50
2.5V
1.5V
40
1V
30
20
L=47uH
C=2*47uF
VOUT=3.4V
10
0
0
50
100
150
200
250
300
350
Output Current (mA)
Output Current vs. Ripple Voltage
70
Ripple Voltage(mV)
60
50
2V
3V
40
2.5V
30
20
10
L=47uH
C=3*47uF
VOUT=3.4V
1.5V
1V
0
0
50
100
150
200
250
300
350
Output Current (mA)
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CYT2606L
Package Information
Symbol
A
A1
A2
B
c
D
E
E1
e
e1
L
L1
?
Dimensions In Millimeters
Min
Max
1.050
1.250
0.000
0.100
1.050
1.150
0.300
0.400
0.100
0.200
2.820
3.020
1.500
1.700
2.650
2.950
0.950TYP
1.800
2.000
0.700REF
0.300
0.600
0ٛ8
ٛ0ٛ
Dimensions In Inches
Min
Max
0.041
0.049
0.000
0.004
0.041
0.045
0.012
0.016
0.004
0.008
0.111
0.119
0.059
0.067
0.104
0.116
0.037TYP
0.071
0.079
0.028REF
0.012
0.024
8ٛ
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CYT2606 L
Symbol
A
b
b1
c
D
D1
E
E1
e
e1
L
Min
1.400
0.320
0.400
0.350
4.400
Max
1.600
0.520
0.580
0.440
4.600
Min
0.055
0.013
0.016
0.014
0.173
2.600
4.250
0.091
0.155
1.550 REF
2.300
3.940
0.061 REF
1.500 TYP
3.000 TYP
0.900
Max
0.063
0.197
0.023
0.017
0.181
0.102
0.167
0.060TYP
0.118TYP
1.200
0.035
0.047
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