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| 型号： | LM8801XUX-1.82 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 6400 kHz SWITCHING FREQ-MAX, BGA6 |
| 封装： | 1.065 X 1.265 MM, 0.25 MM HEIGHT, 0.40 MM PITCH, MICRO, SMD-6 |
| 文件页数： | 1/18页 |
| 文件大小： | 1019K |
| 代理商： | LM8801XUX-1.82 |
LM8801
October 11, 2011
High Precision 6MHz, 600 mA Synchronous Step-Down
DC-DC Converter for Mobile Applications
General Description
The LM8801 step-down DC-DC converter is optimized for
powering ultra-low voltage circuits from a single Li-Ion cell and
input voltage rails from 2.3V to 5.5V. It provides up to 600 mA
load current over the entire input voltage range.
The LM8801 has a mode-control pin that allows the user to
select continuous PWM operation over the complete load
range or an auto PFM-PWM mode that changes modes au-
tomatically depending on the load. During PWM mode, the
device operates at a fixed-frequency of 6 MHz (typ.). In Auto
PFM-PWM mode, hysteretic PFM extends the battery life
through reduction of the quiescent current during light loads
and system standby.
The LM8801 is available in a 6-bump micro SMD package.
Only three compact external surface-mount components, an
inductor and two capacitors, are required.
Features
■ Over 90% efficiency at 6 MHz Operation
■ 600 mA maximum load capability
■ 6 MHz PWM fixed switching frequency (typ.)
■ 27 A (typ.) quiescent current in PFM mode
■ Wide Input Voltage Range: 2.3V to 5.5V
■ V
OUT = 1.0V to 2.9V with 50 mV steps
■ ±1.5% DC output voltage precision over temperature
■ Best-in-class load transient response
■ Low output ripple in PFM mode
■ Automatic PFM/PWM mode switching
■ Current overload and thermal shutdown protection
■ Internal soft-start
■ 6-bump micro SMD package
(1.065 x 1.265 , 0.6 mm or 0.25 mm height)
■ Total solution size < 7mm2 (works with 0402 capacitors)
■ UVLO
Applications
■ Mobile Phones
■ MP3 players
■ Wireless LAN
■ PDAs, Pocket PCs
■ Portable Hard Disk Drives
Typical Application Circuit
30082230
Efficiency vs. Output Current
(Auto Mode, V
OUT = 1.82V)
30082201
2011 National Semiconductor Corporation
300822
www.national.com
LM8801
High
Precision
6MHz,
600
mA
Synchronous
Step-Down
DC-DC
Converter
for
Mobile
Applications
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