LP3204
1.5MHz, 800mA, High Efficiency Synchronous
PWM Step-Down DC/DC Convert
General Description
The LP3204 is a constant frequency, current mode,
PWM step-down converter. The device integrates a
main switch and a synchronous rectifier for high
efficiency. The 2.5V to 5.5V input voltage range
makes the LP3204 is ideally suited for portable
electronic devices that are powered from 1-cell
Li-ion battery or from other power sources within
the range such as cellular phones, PDAs and
handy-terminals.
Internal synchronous rectifier with low RDS(ON)
dramatically reduces conduction loss at PWM mode.
The internal synchronous switch increases
efficiency while eliminate the need for an external
Schottky diode.The switching ripple is easily
smoothed-out by small package filtering elements
due to a fixed operation frequency of 1.5MHz. This
along with small SOT-23-5 package provide small
PCB area application. Other features include soft
start, lower internal reference voltage with 2%
accuracy, over temperature protection, and over
current protection.
Features
High Efficiency: 96%
1.5MHz Fixed-Frequency PWM Operation
Adjustable Output From 0.6V to VIN
800mA Output Current, 1.1A Peak Current
No Schottky Diode Required
100% Duty Cycle Low Dropout Operation
Available in SOT23-5 Package
Short Circuit and Thermal Protection
Over Voltage Protection
Low than 1µA Shutdown Current
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA
DSC
Wireless Card
Pin Configurations
Ordering Information
LP3204
□
-
□ □ □ □
A-Type
Package Type
B5: SOT-23-5
Output Voltage:
15: 1.5V
18: 1.8V
25: 2.5V
28: 2.8V
AD:Adjust
Output Type:
A:A-Type
B:B-Type
B-Type
Marking Information
RoHS compliant and compatible
with the current require ments of
IPC/JEDEC J-STD-0202.
Suitable for use in SnPb or Pb-free
soldering processes.
LP3204-datasheet
Feb.-2006
1
-
1
LP3204
Electrical Characteristics
(VIN = 3.6V, VOUT = 2.5V, VREF = 0.6V, L = 2.2µH, CIN= 4.7µF, COUT= 10µF, TA= 25°C, IMAX = 650mA unless
otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Reference Voltage
Adjustable Output Range
Symbol
VIN
IQ
ISHDN
VREF
VOUT
Δ
VOUT
Δ
VOUT
Fix
Output
Voltage
Accuracy
Δ
VOUT
Δ
VOUT
Δ
VOUT
Δ
VOUT
Δ
VOUT
VFB =
VIN
IOUT =
200mA
IOUT =
200mA
VIN =
2.2 to
5.5 V
VIN = 3.6V
VIN = 3.6V
VIN = 2.2 to 5.5V, VOUT = 1.0V 0A <
IOUT < 600mA
VIN = 2.2 to 5.5V, VOUT = 1.2V 0A <
IOUT < 600mA
VIN = 2.2 to 5.5V, VOUT = 1.5V 0A <
IOUT < 600mA
VIN = 2.2 to 5.5V, VOUT = 1.8V 0A <
IOUT < 600mA
VIN = 2.8 to 5.5V, VOUT = 2.5V 0A <
IOUT < 600mA
VIN = 3.5 to 5.5V, VOUT = 3.3V 0A <
IOUT < 600mA
VIN = VOUT + 0.2V to 5.5V, VIN
≧
Adjustable
3.5V 0A < IOUT < 600mA
VIN = VOUT + 0.4V to 5.5V, VIN
≧
2.2V 0A < IOUT < 600mA
FB Input
Current
PMOSFET
RON
NMOSFET
RON
P-Channel
Current
Limit
EN
Threshold
EN Leakage
Current
IFB
IOUT = 0mA, VFB = VREF + 5%
EN = GND
For adjustable output voltage
0.588
VREF
−3
−3
−3
−3
−3
−3
−3
−3
-30
0.16
0.19
Test Conditions
Min
2.5
270
0.1
0.6
Typ
Max
6
370
1
0.612
VIN
−
0.2
+3
+3
+3
+3
+3
+3
+3
+3
30
0.26
Units
V
μA
μA
V
V
%
%
%
%
%
%
%
%
nA
Ω
Ω
PRDS(ON)
NRDS(ON)
IP(LM)
1
1.2
1.4
VEN
0.3
1.0
1.5
V
VENL
--
1
uA
LP3204-datasheet
Feb.-2006
4
-
4
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