LN2266
Super-Small Package PWM Control Step-up Switching Regulator
■
General Description
The LN2266
is a compact, high efficiency, and
low
voltage step-up DC/DC converter with an Adaptive Current
Mode PWM control loop, includes an error amplifier,
ramp generator, comparator, switch pass element and
driver in which providing a stable and high efficient
operation over a wide range of load currents. It operates in
stable waveforms without external compensation.
The low start-up input voltage below 0.9V makes LN2266
suitable for 1 to 4 battery cells applications of providing up
to 1100mA output current. Besides, the 17µA low
quiescent current together with high efficiency maintains
long battery lifetime. The output voltage is set with two
external resistors. Both internal 2.5A switch and driver for
driving external power devices (NMOS or NPN) are
provided.
High supply capability to deliver 3.3V 300mA with1
alkaline cell or deliver 5V 1100mA with 1 Li-ion Cell
17µA quiescent (switch-off) supply current
0.01µA shutdown mode supply current
Providing flexibility for using internal and external
power switches
Output
voltage:
settable
to
between
2.0V
to
6.0V ,accuracy of 2%
■
Applications
MP3
PDA
DSC
LCD panel
RF-Tags
Portable
instrument
Wireless equipment
■
Features
0.9V（Iout=1mA） Low start-up input voltage
1000kHz fixed switching frequency
90% efficiency
■
Package
SOT-23-6L
SOT-89-5L
■
Ordering Information
LN2266P①②③④
Designator
①
Symbol
A
B
1
②
2
4
Description
CE with EXT
CE without EXT
Reference accuracy:±1%
Reference accuracy:±2%
Reference accuracy:±4%
④
Designator
③
Symbol
M
P
R
L
Description
SOT-23-6L
SOT-89-5L
Embossed Tape :Standard Feed
Embossed Tape : Reverse Feed
■
Pin Configuration
Rev.1.0
—
Dec. 20, 2011
1
www.natlinear.com
LN2266
■
Pin Assignment
Pin Mumber
SOT-23-6
1
2
3
4
5
6
SOT-89-5
1
-
5
4
2
3
Pin Name
CE
NC
GND
LX
VDD
FB
Chip enable
Floating or connected to GND
Ground
Pin for switching
Input positive power pin of LN2266
Feedback input pin
Function
■
Marking Rule
SOT-23-6L, SOT-89-5L
1
Represents the product name
Symbol
A
Product Name
LN2266P****
2
Represents the type of regulator
Symbol
Type
A
CE with EXT
B
CE without EXT
3
Represents the accuracy of reference voltage
Symbol
1
2
4
Reference Accuracy
1%
2%
4%
④
Represents the assembly lot No.
0-9，A-Z; 0-9，A-Z mirror writing，repeated（G，I，J，O，Q，W exception）
Rev.1.0
—
Dec. 20, 2011
2
www.natlinear.com
LN2266
■
Function Block Diagram
■
Absolute Maximum Ratings
Parameter
Input voltage
Output voltage
LX pin Switch Current
Power dissipation
Operating ambient temperature
Storage ambient temperature
PD
Symbol
V
DD
V
OUT
V
LX
I
LX
SOT-23-6
SOT-89-5
Topr
Tstg
Maximum Rating
Vss-0.3½Vss+7
Vss-0.3½Vss+7
Vss-0.3½Vss+7
2.5
150
500
-40½＋80
-40½＋125
A
mW
V
Unit
℃
Caution :
The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
Rev.1.0
—
Dec. 20, 2011
3
www.natlinear.com
LN2266
■
Electrical Characteristics
(VIN=1.5V,VDD=3.3V,I
Load
=0,Ta=25℃, unless otherwise noted)
Item
Operation start voltage
VDD supply voltage
Shut down current
Switch-off Current
Continuous Switching Current
No load Current
Feedback Reference Voltage
Switching Frequency
Maximum Duty
LX on resistance
Current Limit Setting
EXT on resistance to VDD
EXT on resistance to GND
Line Regulation
Load Regulation
CE pin Trip level
Temperature Stability for Vout
Thermal Shut down Hysterises
Ts
ΔTsd
ΔVline
ΔVload
Ilimit
Symbol
V
ST
V
DD
I
OFF
Iswitch-off
Iswitch
Ino-load
Vref
Fs
Dmax
Condition
I
OUT
=1mA
VDD pin voltage
CE=0,VIN=4.5V
VIN=6V
VIN=CE=3.3V,VFB=GND
VIN=1.5V,VOUT=3.3V
Close Loop Vdd=3.3V
Vdd=3.3V
Vdd=3.3V
Vdd=3.3V
Vdd=3.3V
Vdd=3.3V
Vdd=3.3V
Vin=3.5~6V,IL=1mA
VIN=2.5V,IL=1~100mA
VDD=3.3V
Min.
-
2
－
－
－
－
1.225
800
70
－
2.3
－
－
－
－
0.4
－
－
0.01
17
500
56
1.25
1000
75
0.18
2.5
4
2.15
0.25
0.5
0.8
50
10
Typ.
0.9
Max.
1.00
6
1
25
－
－
1.275
1250
80
0.25
2.7
8.0
8.0
5
－
1.2
－
－
Unit
V
µA
µA
μA
µA
V
KHz
%
Ω
A
Ω
Ω
mV/V
mV/mA
V
Ppm/℃
℃
■
Test Circuits
Rev.1.0
—
Dec. 20, 2011
5
www.natlinear.com
NXP MCU
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