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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX689 Datasheet

High-Accuracy / Low-Dropout Linear Regulators

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19-0329; Rev 0; 12/94
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
High-Accuracy, Low-Dropout
Linear Regulators
_______________General Description
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.
________________________Applications
High-Efficiency Linear Regulator
Battery-Powered Devices
Portable Instruments
Portable Telephones
Power Supply or Backup Supply for Memory
__________________Pin Configuration
____________________________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
PART
TEMP. RANGE PIN-PACKAGE
MAX687CPA
0°C to +70°C
8 Plastic DIP
MAX687CSA
0°C to +70°C
8 SO
MAX687CUA
0°C to +70°C
8 µMAX
MAX687EPA
-40°C to +85°C
8 Plastic DIP
MAX687ESA
-40°C to +85°C
8 SO
Ordering Information continued at end of data sheet.
__________Typical Operating Circuit
+3.5V to +5V INPUT
Q1
FZT749
RB
12
3.3V @ 500mA
TOP VIEW
IN 1
(ON) SHDN 2
PFO 3
GND 4
MAX687
MAX688
MAX689
8 CC
7 BASE
6 BLIM
5 OUT
( ) ARE FOR MAX687
DIP/SO/µMAX
C1
2.2µF
ON
GND
BASE
IN
BLIM
OUT
MAX687 PFO
ON CC
GND
C2
68µF POWER-FAIL
OUTPUT
C3
10nF
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX689 Datasheet

High-Accuracy / Low-Dropout Linear Regulators

No Preview Available !

High-Accuracy, Low-Dropout
Linear Regulators
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage IN to GND ............................................12V
Terminal Voltages to GND
PFO (MAX687) ........................................-0.3V to VOUT + 0.3V
PFO (MAX688/MAX689) ......................................-0.3V to 12V
All Remaining Pins .....................................-0.3V to VIN + 0.3V
PFO Sink Current ...............................................................10mA
PFO Source Current (MAX687)...........................................10mA
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
Operating Temperature Ranges
MAX68_C_A .......................................................0°C to +70°C
MAX68_E_A ....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 3.8V, SHDN = VIN (MAX688/MAX689), RB = 0, C1 = 2.2µF, C2 = 10µF, C3 = 10nF, TA = TMIN to TMAX, unless otherwise
noted. Typical values are at TA = +25°C.)
PARAMETER
LINEAR REGULATOR
Supply Voltage
Output Voltage
Dropout Voltage (Note 2)
Line Regulation
Load Regulation
Supply Current
BASE Sink Current
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VIN (Note 1)
VOUT
MAX687/MAX688
MAX689
VIN = 3.8V, IBASE = 1mA
3.8V VIN 11.0V,
1µA IBASE 10mA
VIN = 3.5V, IBASE = 1mA
3.5V VIN 11.0V,
1µA IBASE 10mA
VIN - VOUT PNP = FZT749, ILOAD = 200mA, C2 = 20µF
MAX687/MAX688
3.8V VIN 11.0V,
IBASE = 1mA
MAX689
3.5V VIN 11.0V,
IBASE = 1mA
IGND
1µA IBASE 10mA
VIN = 3.8V,
PNP = FZT749,
no load
On
Standby,
MAX688/MAX689
Shutdown
IBASE VBASE = VIN - 1V
2.7
3.2
3.13
2.9
2.85
10
3.3
3.3
3.0
3.0
40
0.4
0.4
45
150
11
< 0.02
20
11.0
3.4
3.47
3.1
3.15
1.4
1.4
60
250
25
1
40
V
V
mV
mV/V
mV
µA
mA
Base-Current Limit
RB is connected from BASE to BLIM (),
RB = 0to 100
70 100 130
RB + 5RB + 5RB + 5
mA
Start-Up Time
Start-Up Overshoot
Load Capacitance
(Note 3)
C2 PNP = FZT749, ILOAD = 100mA (Note 4)
300
2
10
µs
%
µF
2 _______________________________________________________________________________________


Part Number MAX689
Description High-Accuracy / Low-Dropout Linear Regulators
Maker Maxim Integrated
Total Page 12 Pages
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