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參數(shù)資料
| 型號： | LPO4812 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter |
| 中文描述： | 多達500個，高效率同步降壓毫安型DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 162K |
| 代理商： | LPO4812 |
Semiconductor Components Industries, LLC, 2005
January, 2005 Rev. 5
1
Publication Order Number:
NCP1511/D
NCP1511
Up to 500 mA, High
Efficiency Synchronous
StepDown DCDC Converter
in Chip Scale Package
The NCP1511 stepdown PWM DCDC converter is optimized
for portable applications powered from 1cell Liion or 3cell
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 NCP1511 optimizes
efficiency in light load conditions when switched from a normal
PWM mode to a “pulsed switching” mode. The device also has a
builtin 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 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 A in Pulsed Switching Mode
Low 0.1 A Shutdown Current
30
°
C to 85
°
C Operation Temperature
Ceramic Input/Output Capacitor
9 Pin Chip Scale Package
PbFree 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
DAL
AYWW
A1
http://onsemi.com
Device
Package
Shipping
ORDERING INFORMATION
NCP1511FCT1
3000 Tape & Reel
9 PIN
MICRO BUMP
FC SUFFIX
CASE 499AC
MARKING
DIAGRAM
Micro Bump
XX
A
Y
WW = Work Week
= Device Code
= Assembly Location
= Year
C1
C2
C3
B1
B2
B3
A1
A2
A3
Pin: A1. GNDP
A2. LX
A3. VCC
B1. SYNC
B2. GNDA
B3. FB
C1. SHD
C2. CB1
C3. CB0
(Bottom View)
PIN CONNECTIONS
NCP1511FCT1G
3000 Tape & Reel
Micro Bump
(PbFree)
A1
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.
Figure 1. Typical Application Circuit
VCC
SHD
SYNC
GNDA GNDP
CB0
CB1
FB
LX
V
in
2.5 V 5.2 V
6.8 H
V
out
C
out
22 F
CB0 and CB1
Control Input
C
in
10 F
A3
C1
B1
B2
A1
C3
C2
B3
A2
0
0.1
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
PWM Mode
Pulsed Mode
E
I
out
(mA)
Figure 2. Efficiency vs. Output Current
V
in
= 3.6 V
V
out
= 1.5 V
T
A
= 25
°
C
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