Maxim MAX667EPA, MAX667ESA, MAX667C-D, MAX667CPA, MAX667CSA Datasheet

19-3894; Rev 3; 10/94

+5V/Programmable Low-Dropout

_______________General Description

The MAX667 low-dropout, positive, linear voltage regu­lator supplies up to 250mA of output current. With no
load, it has a typical quiescent current of 20µA. At
200mA of output current, the input/output voltage differ­ential is typically 150mV. Other features include a low­voltage detector to indicate power failure, as well as
early-warning and low-dropout detectors to indicate an
imminent loss of output voltage regulation. A shutdown
control disables the output and puts the circuit into a
low quiescent-current mode.

The MAX667 employs Dual Mode™ operation. One
mode uses internally trimmed feedback resistors to pro­duce +5V. In the other mode, the output may be varied
from +1.3V to +16V by connecting two external resistors.

The MAX667 is a pin-compatible upgrade to the
MAX666 in most applications where the input voltages
are above +3.5V. Choose the MAX667 when high out­put currents and/or low dropout voltages are desired,
as well as for improved performance at higher
temperatures.

________________________Applications

Battery-Powered Devices
Pagers and Radio Control Receivers
Portable Instruments
Solar-Powered Instruments

Voltage Regulator

____________________________Features

♦ 350mV Max Dropout at 200mA
♦ 250mA Output Current
♦ Normal Mode: 20µA Typ Quiescent Current

Shutdown Mode: 0.2µA Typ Quiescent Current

♦ Low-Battery Detector
♦ Fixed +5V (Min Component Count) or

Adjustable Output

♦ +3.5V to +16.5V Input
♦ Dropout Detector Output
♦ 10µF Output Capacitor

______________Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX667CPA 0°C to +70°C 8 Plastic DIP
MAX667CSA 0°C to +70°C 8 SO
MAX667C/D 0°C to +70°C
MAX667EPA -40°C to +85°C 8 Plastic DIP
MAX667ESA -40°C to +85°C 8 SO
MAX667MJA -55°C to +125°C 8 CERDIP

* Contact factory for dice specifications.

Dice

*

MAX667

MAX667

__________Typical Operating Circuit

IN

+6.3V

BATTERY

MAX667

TM

Dual Mode is a trademark of Maxim Integrated Products.

________________________________________________________________

OUT

GND SHDNSET

C1

10µF

+5V OUT

__________________Pin Configuration

TOP VIEW

1

DD

2

OUT

LBI

GND

MAX667

3
4

DIP/SO

Maxim Integrated Products

Call toll free 1-800-998-8800 for free samples or literature.

8

IN

7

LBO

6

SET

5

SHDN

1

+5V/Programmable Low-Dropout
Voltage Regulator

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage ...........................................................+18V

Output Short Circuited to Ground.........................................1sec

LBO Output Sink Current....................................................50mA

LBO Output Voltage...............................................GND to V

SHDN Input Voltage....................................-0.3V to (VIN+ 0.3V)

Input Voltages LBI, SET................................-0.3V to (V

Continuous Power Dissipation

MAX667

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

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.

IN

OUT

- 1.0V)

ELECTRICAL CHARACTERISTICS

(GND = 0V, VIN= +9V, V

PARAMETER

Input Voltage

Output Voltage

Maximum Output Current I

Quiescent Current I

Dropout Voltage (Note1)
Load Regulation

Line Regulation
SET Reference Voltage V
SET Input Leakage Current I
Output Leakage Current
Short-Circuit Current
Low-Battery Detector

Reference Voltage
Low-Battery Detector

Input Leakage Current
Low-Battery Detector

Output Voltage
SHDN Threshold

SHDN Leakage Current

Dropout Detector Output
Voltage

Note 1: Dropout Voltage is V
Note 2: Short-Circuit Current is pulse tested to maintain junction temperature. Short-circuit duration is limited by package dissipation.

= +5V, C1 = 10µF, unless otherwise noted.)

OUT

SYMBOL

V

IN

V

OUT

OUT

Q

SET

SET

I

OUT

I

OUT

V

LBI

I

LBI

V

LBO

V

SHDN

I

SHDN

V

DD

IN-VOUT

V
TA= -40°C to +85°C

V
TA= -55°C to +125°C

VIN= 6V, 4.5V < V
V

V
V

I
I
I
VIN= 6V to 10V, I

V
(Note 2)

VIN= 9V, V
V

V
V

V
RDD= 100kΩ,
I

when V

CONDITIONS

= 0V, VIN= 6V, I

SET

= 0V, VIN= 6V, I

SET

LBI

OUT

I
I
I

OUT

= 2V, I

IN

VIN= 7V

VIN= 4.5V

OUT
OUT
OUT

= 2V

SHDN

= 0V,

SHDN

= 0V

SET

= 100µA

OUT

= 200mA

OUT

= 10mA to 200mA

OUT

= 1.5V nA

SET

= 2V

SHDN

= 1.5V nA

LBI

IH
IL

= 0V to V

SHDN

= 0V,

SET

= 0V,

SHDN

= 10mA

OUT

falls to 0.1V below its value at VIN= V

OUT

SO (derate 5.88mW/°C above +70°C).........................471mW

CERDIP (derate 8.00mW/°C above +70°C).................640mW

Operating Temperature Ranges

MAX667C_A........................................................0°C to +70°C

MAX667E_A.....................................................-40°C to +85°C

MAX667MJA..................................................-55°C to +125°C

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

TA= +25°C

MIN TYP MAX

TA= T

MIN TYP MAX

MIN

to T

3.5 16.5

= 10mA,

OUT

OUT

< 5.5V

= 10mA,

250 250

5 4.8 5.2

5 4.75 5.25

0.2 1
= 0µA
= 100µA
= 200mA

20 25 35
20 30

515 20
560 75

150 250

50 100 250

= 10mA

510

1.225

1.20 1.25

0.01 ±10 ±1000V

0.1 1

400

1.225 1.195 1.255

0.01 ±10 ±1000V

LBO

= 10mA

1.5

0.25 0.4

1.5

0.3 0.3V

0.01 ±10 ±1000

3.5

+ 2V.

OUT

MAX

2

50

350

15

450

0.25

UNITS

V

V

mA

µA

mA
mV
mV

mV

V

µA

mA

V

V

V

nA

V

2 _______________________________________________________________________________________

+5V/Programmable Low-Dropout

Voltage Regulator

__________________________________________Typical Operating Characteristics

(TA= +25°C, unless otherwise noted.)

DROPOUT VOLTAGE

1000

100

10

DROPOUT VOLTAGE (mV)

1

vs. LOAD CURRENT

1 10 100 1000

LOAD CURRENT (mA)

MAX667-Fg TOC 1

QUIESCENT CURRENT

100,000

10,000

1000

QUIESCENT CURRENT (µA)

100

10

vs. LOAD CURRENT

VIN = +6V

0.01 0.1 1 10 100 1000
LOAD CURRENT (mA)

1000

MAX667-Fg TOC 2

100

10

DD OUTPUT CURRENT (µA)

1

DD OUTPUT CURRENT

vs. INPUT-OUTPUT DIFFERENCE

5 10

20 50 100mA LOAD

1

2

0 50 150 250

100 200

INPUT-OUTPUT DIFFERENCE (mV)

MAX667-Fg TOC 3

_____________________Pin Description _______________Detailed Description

Figure 1 shows a micropower bandgap reference, an

PIN

FUNCTIONNAME

Dropout Detector Output—the collec-

DD1

OUT2

LBI3

SHDN5

SET6

LBO7

tor of a PNP pass transistor. Normally
an open circuit, it sources current as
dropout is reached.

Regulated Output Voltage. OUT falls
to 0V when SHDN is above 1.5V. SET
determines output voltage when SET
is above 50mV; otherwise, it is 5V.
OUT must be connected to an output
filter capacitor.

Low-Battery Detector. A CMOS input
to an internal 1.255V comparator
whose output is the LBO pin.

GroundGND4
Shutdown Input. Connect to GND for

normal operation (output active). Pull
above 1.5V to disable OUT, LBO, and
DD and to reduce quiescent current to
less than 1µA.

(Output) Voltage Set, CMOS Input.
Connect to GND for 5V output. For
other voltages, connect external resis­tive divider from OUT.

Low-Battery Output. An open-drain N­channel transistor that sinks current to
GND when LBI is less than 1.22V.

Positive Input Voltage (unregulated)IN8

error amplifier, a PNP pass transistor, and two com­parators as the main elements of the MAX667. One
comparator, C1, selects the fixed 5V or adjustable
operation with an external voltage divider. The other
comparator, C2, is a low-battery detector.

The bandgap reference, which is trimmed to 1.22V,
connects internally to one input of the error amplifier,
A1. The feedback signal from the regulator output sup­plies the other input of A1 from either an on-chip volt­age divider or two external resistors. When SET is
grounded, the internal divider provides the error ampli­fier feedback signal for a fixed 5V output. When SET is
more than 50mV above ground, the error amplifier’s
input switches directly to SET while an external resistor
divider from OUT determines the output voltage.

A second comparator, C2, compares the LBI input to
the internal reference voltage. LBO is an open-drain
FET connected to GND. The low-battery threshold can
also be set with a voltage divider at LBI. In addition, the
MAX667 has a shutdown input (SHDN) that disables
the load and the device while reducing quiescent cur­rent when it is pulled high.

+5V Output

Figure 2 shows the connection for a fixed 5V output.
The SET input is grounded, and no external resistors
are required. Figure 3 shows adjustable output opera­tion. R1 and R2 set the output voltage. SHDN should be
grounded if not used.

MAX667

_______________________________________________________________________________________ 3