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參數(shù)資料
| 型號： | MAX687 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Accuracy, Low-Dropout Linear Regulators(3V,用于便攜電話的,高精度線性穩(wěn)壓控制器) |
| 中文描述： | 高精度、低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 128K |
| 代理商： | MAX687 |
_______________General Desc ription
The MAX687/MAX688/MAX689 low-dropout linear regula-
tors operate with an input-to-output voltage differential lim-
ited only by an external PNP transistor. Outputs are fixed
at 3.3V (MAX687/MAX688) or 3.0V (MAX689). The only
external components required are a PNP pass transistor
and output, compensation, and bypass capacitors. Base
drive to the external transistor is at least 10mA, permitting
output currents to exceed 1A when using high-gain tran-
sistors (
β
> 100). Output current limiting is implemented
by limiting the external transistor’s base current. Output
voltage monitoring and shutdown functions are included.
The 3.3V MAX687 automatically shuts down whenever
the output voltage drops below 2.96V. An internal
power-fail comparator also monitors the output and pro-
vides an early warning of low output voltage before the
device shuts down. When shut down, the output is
latched off until the ON input is pulsed. Turning off the
power supply in this way prevents battery damage due
to excessive discharge or cell-reversal. Typical applica-
tions include portable telephones and other battery-pow-
ered equipment where the power supply must be
disabled when the battery voltage is low.
The MAX688 and MAX689 do not have an automatic
shutdown function, and are identical except for their
output voltages. Each device has an active-low shut-
down-control input, used to turn its output on or off at
any time. As SHDN falls, the device enters a standby
mode before fully shutting down. When in standby, the
reference and comparators are fully operational, per-
mitting the transition from normal mode to standby
mode to occur at a precise voltage level on SHDN.
________________________Applic ations
High-Efficiency Linear Regulator
Battery-Powered Devices
Portable Instruments
Portable Telephones
Power Supply or Backup Supply for Memory
____________________________Features
o
Fixed Outputs:
3.3V (MAX687/MAX688)
3.0V (MAX689)
o
Directly Drives External PNP Transistor
o
10mA Min Base-Current Drive for >1A Output
o
Low Dropout Voltage:
100mV Dropout at 650mA Output (FZT749)
40mV Dropout at 200mA Output (FZT749)
0.8V Dropout at 4A Output
o
Power-Fail Output Monitors the Output Voltage
o
Automatic, Latched Shutdown when Output Falls Out
of Regulation (MAX687)
o
Precision Threshold Shutdown Control
(MAX688/MAX689)
o
Low Supply Current:
150μA Operating
<1μA Shutdown
o
2.7V to 11.0V Supply Range
o
8-Pin DIP/SO/μMAX Packages
o
<2mV Line Transient with 3.4V to 3.6V Input
o
Output Accuracy <±2%
______________Ordering Information
Ordering Information continued at end of data sheet.
M
High-Ac c urac y, Low-Dropout
Linear Regulators
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
MAX687
Q1
FZT749
R
B
12
BASE
GND
C1
2.2
μ
F
IN
BLIM
OUT
POWER-FAIL
OUTPUT
3.3V @ 500mA
PFO
CC
+3.5V to +5V INPUT
ON
C3
10nF
ON
GND
C2
68
μ
F
__________Typic al Operating Circ uit
1
2
3
4
8
7
6
5
CC
BASE
BLIM
OUT
GND
PFO
(ON) SHDN
IN
MAX687
MAX688
MAX689
DIP/SO/
μ
MAX
TOP VIEW
( ) ARE FOR MAX687
__________________Pin Configuration
19-0329; Rev 0; 12/94
PART
MAX687
CPA
MAX687CSA
MAX687CUA
MAX687EPA
MAX687ESA
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
8 Plastic DIP
8 SO
8 μMAX
8 Plastic DIP
8 SO
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
-40°C to +85°C
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