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Power Analog Micoelectronics

PAM2305 Datasheet Preview

PAM2305 Datasheet

1A Step-Down DC-DC Converters

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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




Power Analog Micoelectronics

PAM2305 Datasheet Preview

PAM2305 Datasheet

1A Step-Down DC-DC Converters

No Preview Available !

PAM2305
1A Step-Down DC-DC Converters
Block Diagram
FB
R1
R2
EN
1.5M
OSC
SLOPE
COMP
FREQ
SHIFT
OSC
-
EA
VIN +
COMP
0.6VREF
SHUTDOWN
PWM
COMP
+
IAMP
-
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
+
IRCMP
-
VIN
MAIN
SWITCH(PCH)
SW
SYNCHRONOUS
RECTIFIER(NCH)
GND
Pin Configuration& Marking Information
Top View
SOT23-5
Top View
DFN 2x2 6L
Top View
QFN 3x3 16L
VIN 1
GND 2
www.DataESNhee3t4U.com
5 SW
NC 1
EN 2
4 VOUT/FB VIN 3
16 15 14 13
6 VOUT/FB GND 1
12 VIN
5 GND
GND 2
GND 3
P2305V
XXXYW
11 VIN
10 VIN
4 SW
VOUT/FB 4
9 VIN
5678
BE: Product Code
of PAM2305
V: Output Voltage
Y: Year
W: Week
X: Internal Code
Pin Description
Name
VIN
GND
EN
VOUT/FB
SW
NC
Function
Chip main power supply pin
Ground
Enable control input. Force this pin voltage above 1.5V, enables the chip, and below
0.3V shuts down the device.
VOUT: Output voltage feedback pin, an internal resistive divider divides the output
voltage down for comparison to the internal reference voltage.
FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
The drains of the internal main and synchronous power MOSFET.
No connection
Power Analog Microelectronics,Inc
www.poweranalog.com
2
09/2008 Rev 1.2


Part Number PAM2305
Description 1A Step-Down DC-DC Converters
Maker Power Analog Micoelectronics
Total Page 17 Pages
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