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參數資料
| 型號： | MC34280FTB |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | Power Supply & Management IC for Handheld Electronic Products |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 380K |
| 代理商： | MC34280FTB |
Semiconductor Components Industries, LLC, 1999
February, 2000 – Rev. 2
1
Publication Order Number:
MC34280/D
!
The MC34280 is a power supply integrated circuit which provides
two boost regulated outputs and some power management supervisory
functions. Both regulators apply Pulse–Frequency–Modulation
(PFM). The main step–up regulator output can be externally adjusted
from 2.7V to 5V. An internal synchronous rectifier is used to ensure
high efficiency (achieve 87%). The auxiliary regulator with a built–in
power transistor can be configured to produce a wide range of positive
voltage (can be used for LCD contrast voltage). This voltage can be
adjusted from +5V to +25V by an external potentiometer; or by a
microprocessor, digitally through a 6–bit internal DAC.
The MC34280 has been designed for battery powered hand–held
products. With the low start–up voltage from 1V and the low quiescent
current (typical 35
μ
A); the MC34280 is best suited to operate from 1
to 2 AA/ AAA cell. Moreover, supervisory functions such as low
battery detection, CPU power–on reset, and back–up battery control,
are also included in the chip. It makes the MC34280 the best one–chip
power management solution for applications such as electronic
organizers and PDAs.
FEATURES:
Low Input Voltage, 1V up
Low Quiescent Current in Standby Mode: 35
μ
A typical
PFM and Synchronous Rectification to ensure high efficiency
(87% @200mA Load)
Adjustable Main Output: nominal 3.3V @ 200mA max, with 1.8V
input
Auxiliary Output Voltage can be digitally controlled by
microprocessor
Auxiliary Output Voltage:
+5V @ 25mA max, with 1.8V input
+25V @ 15mA max, with 1.8V input
Current Limit Protection
Power–ON Reset Signal with Programmable Delay
Battery Low Detection
Lithium Battery Back–up
32–Pin LQFP Package
APPLICATIONS:
Digital Organizer and Dictionary
Personal Digital Assistance (PDA)
Dual Output Power Supply (For MPU, Logic, Memory, LCD)
Handheld Battery Powered Device (1–2 AA/AAA cell)
32–LEAD LQFP
FTB SUFFIX
CASE 873A
http://onsemi.com
Device
Package
Shipping
ORDERING INFORMATION
MC34280FTB
LQFP
250 Units/Tray
MC34280FTBR2
LQFP
1800 Tape & Reel
MARKING DIAGRAM
MC34280F
TB
AWLYYWW
1
32
A
WL = Wafer Lot
YY
= Year
WW = Work Week
= Assembly Location
PIN CONNECTIONS
VAUXEN
NC
VAUXBASE
VAUXCHG
VAUXBDV
VAUXFBN
VAUXREF
VAUXFBP
V
V
V
L
N
L
V
V
MC34280
L
D
P
L
L
L
V
V
VMAINFB
VBAT
ENABLE
VDD
PDELAY
VREF
AGND
IREF
1
32
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