NCP1511 Datasheet, PDF (1/16 Pages) ON Semiconductor – Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter

NCP1511
Up to 500 mA, High
Efficiency Synchronous
Step−Down DC−DC Converter
in Chip Scale Package
The NCP1511 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 NCP1511 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 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 NCP1511 is available in a chip scale
package.
Features
• High Efficiency:
93% for 1.89 V Output at 3.6 V Input and 150 mA Load Current
92% 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 V_in = 3.6 V
• Low Quiescent Current of 14 mA in Pulsed Switching Mode
• Low 0.1 mA Shutdown Current
• −30°C to 85°C Operation Temperature
• Ceramic Input/Output Capacitor
• 9 Pin Chip Scale Package
• Pb−Free Package is Available
Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
V_in
2.5 V − 5.2 V
A3 _VCC
C_in
10 mF C1
SHD
B1 _SYNC
LX ^{A2 6.8 mH}
B3
FB
V_out
C_out
22 mF
C2
CB1
CB0 and CB1
CB0 ^C3 Control Input
GNDA GNDP
B2
A1
100
90
80
70
60
50
40
30
20
10
0
0.1
Figure 1. Typical Application Circuit
http://onsemi.com
9 PIN
MICRO BUMP
FC SUFFIX
A1
CASE 499AC
XX = Device Code
A = Assembly Location
Y = Year
WW = Work Week
MARKING
DIAGRAM
DAL
AYWW
A1
PIN CONNECTIONS
A1
B1
C1
A2 B2 C2
A3 B3 C3
(Bottom View)
Pin: A1. − GNDP
A2. − LX
A3. − VCC
B1. − SYNC
B2. − GNDA
B3. − FB
C1. − SHD
C2. − CB1
C3. − CB0
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1511FCT1 Micro Bump 3000 Tape & Reel
NCP1511FCT1G Micro Bump 3000 Tape & Reel
(Pb−Free)
†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
V_in = 3.6 V
V_out = 1.5 V
T_A= 25°C
1
10
100
1000
I_out (mA)
Figure 2. Efficiency vs. Output Current
© Semiconductor Components Industries, LLC, 2005
1
January, 2005 − Rev. 5
Publication Order Number:
NCP1511/D