Preliminary Datasheet
LP3211
High Performance PWM DC/DC Regulated
General Description
Features
The LP3211 is a 1.2MHz high performance PWM
DC/DC converter that produces a regulated 5V output.
No external inductor and diode is required for
operation. The operating voltage range is 2.8V to Vout.
Internal soft-start circuitry effectively reduces the
in-rush current both while start-up and mode change.
The LP3211 features very low quiescent current, over
current protection and short circuit protection.
The LP3211 is available in SOT-23-6 package.
280mA Output current
No Inductor and diode
Soft Start Function
Built-In Short-Circuit Protection
Built-in Thermal Protection
Over Current Protection Function
IQ<1uA in Shutdown
SOT23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
Order Information
Vin
F: Pb-Free
Package Type
B6: SOT23-6
Vout_5V
LP3211
Vin
EN
CE
VOUT
CRY2
□ □ □
CRY1
LP3211 -
—
—
—
—
—
—
—
—
—
GND
Chip Enable
ON
OFF
Applications
—
—
—
—
LCD Panel
Cellular and Smart mobile phone
PDA/DSC
Marking Information
Please see website.
USB Host power
LP3211- – 00 Ver. 1.0 Datasheet
FEB.-2009
Page 1 of 6
Preliminary Datasheet
LP3211
Functional Pin Description
P a c k a g e Ty p e
Pin Configurations
PIN
1
CRY1
2
GND
3
LP3211
SOT23-6
EN
6
CRY2
5
VIN
4
Vout
NAME
1
EN
Chip Enable (Active High)
2
CRY1
CRYSTAL INPUT1.
3
GND
Ground
4
VOUT
5V Output Voltage
5
VIN
Power Input Voltage
6
CRY2
CRYSTAL INPUT2.
Absolute Maximum Ratings
—
—
—
Input Voltage to GND (VIN) ------------------------------------------------------------------------------------ 6V
EN to GND Voltage (Ven) --------------------------------------------------------------------- 0.3V to Vin+0.3V
Maximum DC Output Current(Iout) ----------------------------------------------------------------------- 350mA
—
Operating Junction Temperature Range (TJ) ---------------------------------------------------- 40℃ to 150℃
—
Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------- 260℃
Electrical Characteristics
(Over recommended operating conditions unless specified otherwise) VIN =3.6V,EN=High, TA=25℃ )
Symbol
Parameter
Conditions
Min.
2.8
LP3211
Typ.
Max.
Vout
Unit
VOUT
Input Voltage
Output Voltage Range
IQ
Quiescent Current
No Load
2
4
mA
ISHDN
Shutdown Current
EN = GND
1
5
µA
FOSC
Oscillator Frequency
1.2
1.5
MHz
ISC
Output short Circuit Current Limit Vout<0.5V
450
500
mA
VEN(L)
Enable Threshold Low
0.4
V
VEN(H)
Enable Threshold High
IEN
Input Low Current
VIN
LP3211- – 00 Ver. 1.0 Datasheet
FEB.-2009
5.0
0.9
350
1.5
VIN = VEN = 5.5V
-1
V
V
V
1
µA
Page 2 of 6
Preliminary Datasheet
LP3211
Typical Application Circuit
Vin
Vout_5V
5
Vin
VOUT
LP3211
4
10uF
2.2uF
2
Chip Enable
ON
OFF
CRY2
CE
Rset(NC)
GND
3
6
EN
CRY1
10uF
1
NC
Fig1. Step up to 5V Circuit
Flash WLED Driver
Up to 250mA
Vin
5
Vin
VOUT
LP3211
4
CE
2
Chip Enable
ON
OFF
10uF
CRY2
EN
2.2uF
Rset(NC)
GND
3
10R
6
1
CRY1
10uF
NC
Fig1. Step up to 5V for Flash LED Driver
Flash WLED Driver
Up to 250mA
Vin
5
Vin
VOUT
LP3211
4
2.2uF
CRY2
1uF
Rset(NC)
6
2
PWM
Chip Enable
ON
OFF
EN
CRY1
2.2uF
1
GND
3
100R
NC
Fig1. Step up to 5V for white LED Driver
LP3211- – 00 Ver. 1.0 Datasheet
FEB.-2009
Page 3 of 6
Preliminary Datasheet
LP3211
Typical Operating Characteristics
LP3211- – 00 Ver. 1.0 Datasheet
FEB.-2009
Page 4 of 6
Preliminary Datasheet
LP3211- – 00 Ver. 1.0 Datasheet
FEB.-2009
LP3211
Page 5 of 6
Preliminary Datasheet
LP3211
Packaging Information
LP3211- – 00 Ver. 1.0 Datasheet
FEB.-2009
Page 6 of 6