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NCP1508 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1508
Description  Up to 500 mA, 1 MHz, High Efficiency Synchronous Step−Down DC−DC Converter in DFN Package
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1508 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components I1dustries, LLC, 2006
July, 2006 − Rev. 1
1
Publication Order Number:
NCP1508/D
NCP1508
Up to 500 mA, 1 MHz, High
Efficiency Synchronous
Step−Down DC−DC
Converter in DFN Package
The NCP1508 step−down PWM DC−DC converter is optimized
for portable applications powered from 1−cell Li−ion or 3 cell
Alkaline/NiCd/NiMH batteries. This DC−DC converter utilizes a
current−mode control architecture for easy compensation and better
line regulation. It also uses synchronous rectification to increase
efficiency and reduce external part count. The NCP1508 optimizes
efficiency in light load conditions when switched from a normal
PWM mode to a “pulsed switching” mode. The device also has a
built−in 1 MHz (nominal) oscillator for the PWM circuitry, or it can
be synchronized to an external 500 kHz to 1000 kHz clock signal.
Finally, it includes an integrated soft−start, cycle−by−cycle current
limiting, and thermal shutdown protection. The NCP1508 is
available in a space saving, low profile 3x3 mm 10 pin DFN package.
Features
High Efficiency:
93% for 1.89 V Output at 3.6 V Input and 125 mA Load Current
91% for 1.89 V Output at 3.6 V Input and 300 mA Load Current
Digital Programmable Output Voltages: 1.0, 1.3, 1.5 or 1.89 V
Output Current up to 500 mA at Vin = 3.6 V
Low Quiescent Current of 14 mA in Pulsed Switching Mode
Low 0.2 mA Shutdown Current
−30°C to 85°C Operation Temperature
Low Profile DFN Package
Pb−Free Package is Available
Application
Cellular Phones, Smart Phones and PDAs
Digital Still Cameras
MP3 Players and Portable Audio Systems
Wireless and DSL Modems
Portable Equipment
MARKING
DIAGRAM
http://onsemi.com
1508 = Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
10 PIN DFN
MN SUFFIX
CASE 485C
1508
ALYW
Device
Package
Shipping†
ORDERING INFORMATION
10 Pin DFN
NCP1508MNR2
10 Pin DFN
(Pb−Free)
3000 Tape & Reel
NCP1508MNR2G
3000 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
1
http://onsemi.com
1
Figure 1. Typical Application Circuit
VCC
VCCP
SHD
SYNC
GNDA GNDP
CB0
CB1
FB
LX
Vin
2.7 V − 5.2 V
6.8 mH
Vout
CB0 and CB1
Control Input
Cin
10 mH
Cout
22 mH
10
9
4
5
7
8
6
3
0
10
20
30
40
50
60
70
80
90
100
0.001
0.1
1
10
100
1000
Iout (mA)
Figure 2. Efficiency vs. Output Current
Pulsed Mode
Vin = 3.6 V
Vout = 1.5 V
0.01
PWM Mode


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