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ON Semiconductor - High Efficiency Synchronous Step-Down DC-DC Converter

Numéro de référence NCP1509
Description High Efficiency Synchronous Step-Down DC-DC Converter
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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NCP1509 fiche technique
NCP1509
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Up to 500 mA, 1 MHz, High
Efficiency Synchronous
Step-Down DC-DC
Converter in DFN Package
The NCP1509 stepdown PWM DCDC converter is optimized
for portable applications powered from 1cell Liion or 3 cell
Alkaline/NiCd/NiMH batteries. This DCDC converter utilizes a
currentmode control architecture for easy compensation and better
line regulation. It also uses synchronous rectification to increase
efficiency and reduce external part count. The NCP1509 optimizes
efficiency in light load conditions when switched from a normal
PWM mode to a “pulsed switching” mode. The device also has a
builtin 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 softstart, cyclebycycle current
limiting, and thermal shutdown protection. The NCP1509 is
available in a space saving, low profile 3x3 mm 10 pin DFN package.
Features
High Efficiency:
92.5% for 1.8 V Output at 3.6 V Input and 125 mA Load Current
91% for 1.8 V Output at 3.6 V Input and 300 mA Load Current
Digital Programmable Output Voltages: 1.05, 1.35, 1.57 or 1.8 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
PbFree 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
100
90
80
Vin
2.5 V 5.2 V
Cin
10uF
5 VCCA
4 VCCP
9 SHD
10 SYNC
LX 3 6.8uH
FB 6
Vout
Cout
22uF
CB1 8 CB0 and CB1
CB0 7 Control Input
70
60
50
40
30
20
GNDA GNDP
12
10
0
0.001
Figure 1. Typical Application Circuit
http://onsemi.com
MARKING
DIAGRAM
1
10 PIN DFN
1509
MN SUFFIX
ALYW
1 CASE 485C
1509 = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
ORDERING INFORMATION
Device
Package
Shipping
NCP1509MNR2 10 Pin DFN 3000 Tape & Reel
NCP1509MNR2G 10 Pin DFN 3000 Tape & Reel
(PbFree)
†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.
Pulsed Mode
PWM Mode
Vin = 3.6 V
Vout = 1.8 V
0.01
0.1 1
Iout (mA)
10
100 1000
Figure 2. Efficiency vs. Output Current
Semiconductor Components Industries, LLC, 2004
September, 2004 Rev. 0
1
Publication Order Number:
NCP1509/D

PagesPages 16
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