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PAM2305 Schematic ( PDF Datasheet ) - Power Analog Micoelectronics

Teilenummer PAM2305
Beschreibung 1A Step-Down DC-DC Converters
Hersteller Power Analog Micoelectronics
Logo Power Analog Micoelectronics Logo 




Gesamt 17 Seiten
PAM2305 Datasheet, Funktion
Features
n Efficiency up to 96%
n Only 40μA(TYP.) Quiescent Current
n Output Current: Up to 1A
n Internal Synchronous Rectifier
n 1.5MHz Switching Frequency
n Soft Start
n Under-Voltage Lockout
n Short Circuit Protection
n Thermal Shutdown
n 5-pin Small SOT23-5, DFN2x2 6-Pin and
QFN3x3 16-Pin Packages
n Pb-Free Package
Applications
n Cellular Phone
n Portable Electronics
n Wireless Devices
n Cordless Phone
n Computer Peripherals
n Battery Powered Widgets
n Electronic Scales
n Digital Frame
PAM2305
1A Step-Down DC-DC Converters
General Description
The PAM2305 is a step-down current-mode, DC-
DC converter. At heavy load, the constant-
frequency PWM control performs excellent
stability and transient response. To ensure the
longest battery life in portable applications, the
PAM2305 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce
quiescent current under light load operation to
save power.
The PAM2305 supports a range of input voltages
from 2.5V to 5.5V, allowing the use of a single
Li+/Li-polymer cell, multiple Alkaline/NiMH cell,
USB, and other standard power sources. The
output voltage is adjustable from 0.6V to the input
voltage, while the part number suffix PAM2305-
XX indicates pre-set output voltage of 3.3V, 2.8V,
2.5V, 1.8V, 1.5V, 1.2V or adjustable. All versions
employ internal power switch and synchronous
rectifierfor to minimize external part count and
realize high efficiency. During shutdown, the input
is disconnected from the output and the shutdown
current is less than 0.1μA. Other key features
include under-voltage lockout to prevent deep
battery discharge.
The PAM2305 is available in SOT23-5, DFN2x2 6-
Pin and QFN3x3 16-Pin packages.
wwwT.DyatpaSihceeat4lU.cAomp p l i c a t i o n
Fixed Output Voltage
VIN
CIN
10μF
1 VIN SW 5 L
GND
2
VOUT 4
3 EN /FB
Vo
Co
10μF
Adjustable Output Voltage
VIN
CIN
10μF
1 VIN
5
SW
GND
4
2 VOUT/FB
3 EN
L
R1
R2
Vo
CFW Co
10μF
VO
=
0.6 ´
æçè1 +
R1
R2
ö
÷ø
Power Analog Microelectronics,Inc
www.poweranalog.com
1
09/2008 Rev 1.2






PAM2305 Datasheet, Funktion
PAM2305
1A Step-Down DC-DC Converters
Typical Performance Characteristics
TA=25 °C, CIN=10μF, CO=10uF, L=4.7μH, unless otherwise noted.
Efficiency VS Input Voltage (Vo=1.2V)
100
90
80
70
60
50
40
30
3
Io=10mA
Io=100mA
Io=800mA
3.5 4 4.5
Input Voltage(V)
5
5.5
Efficiency vs Input Voltage (Vo=1.5V)
100
90
80
70
60
50
10mA
40 100mA
800mA
30
2.5 3 3.5 4 4.5 5 5.5
Input Voltage(V)
Efficiency vs Input Voltage (Vo=1.8V)
100
90
80
70
60
50
10mA
40 100mA
800mA
30
www.DataS2.h5eet4U.c3om
3.5
4
4.5
5
5.5
Input Voltage(V)
Efficiency vs Input Voltage (Vo=2.5V)
100
90
80
70
60
50
40
30
3
10mA
100mA
800mA
3.5 4 4.5
Input Voltage(V)
5
5.5
Efficiency vs Input Voltage (Vo=2.8V)
100
90
80
70
60
50
40
30
3
10mA
100mA
800mA
3.5 4 4.5
Input Voltage(V)
5
5.5
Eifficiency VS Input Voltage (Vo=3.3V)
100
90
80
70
60
50
40
30
20 Io=10mA
10 Io=100mA
I o= 800mA
0
3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
Input Voltage(V)
Power Analog Microelectronics,Inc
www.poweranalog.com
6
09/2008 Rev 1.2

6 Page









PAM2305 pdf, datenblatt
PAM2305
1A Step-Down DC-DC Converters
PCB Layout Check List
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of
the PAM2305. These items are also illustrated graphically in Figure 1. Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct
and wide.
2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected
between the (+) plate of COUT and ground.
3. Does the (+) plate of CIN connect to VIN as closely as possible? This capacitor provides the AC current to
the internal power MOSFETs.
4. Keep the switching node, SW, away from the sensitive VFB node.
5. Keep the (–) plates of CIN and COUT as close as possible.
www.DataSheet4U.com
Figure 1 :PAM2305 Suggested Layout
Power Analog Microelectronics,Inc
www.poweranalog.com
12
09/2008 Rev 1.2

12 Page





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