MAXIM MAX882, MAX883, MAX884 User Manual

General Description

The MAX882/MAX883/MAX884 linear regulators maxi-

mize battery life by combining ultra-low supply currents
and low dropout voltages. They feature 200mA output
current capability at up to +125°C junction temperature
and come in a 1.5W SOIC package. The 1.5W package
(compared to 0.47W for standard SOIC packages)
allows a wider operating range for the input voltage and
output current. The MAX882/MAX883/MAX884 use a P­channel MOSFET pass transistor to maintain a low 11µA
(15µA max) supply current from no-load to the full
200mA output. Unlike earlier bipolar regulators, there are
no PNP base current losses that increase with output
current. In dropout, the MOSFET does not suffer from
excessive base currents that occur when PNP transistors
go into saturation. Typical dropout voltages are 220mV
at 5V and 200mA, or 320mV at 3.3V and 200mA.

The MAX882 features a 7µA standby mode that disables
the output but keeps the reference, low-battery compara­tor, and biasing circuitry alive. The MAX883/MAX884 fea­ture a shutdown (OFF) mode that turns off all circuitry,
reducing supply current to less than 1µA. All three
devices include a low-battery-detection comparator, fold­back current limiting, reverse-current protection, and
thermal-overload protection.

The output is preset at 3.3V for the MAX882/MAX884
and 5V for the MAX883. In addition, all devices employ
Dual Mode™ operation, allowing user-adjustable outputs
from 1.25V to 11V using external resistors. The input volt­age supply range is 2.7V to 11.5V.

For low-dropout linear regulators with output currents up
to 500mA, refer to the MAX603/MAX604 data sheet.

Applications

Pagers and Cellular Phones

3.3V and 5V Regulators

1.25V to 11V Adjustable Regulators
High-Efficiency Linear Regulators
Battery-Powered Devices
Portable Instruments
Solar-Powered Instruments

Features

♦ Foldback Current Limiting

♦ High-Power (1.5W) 8-Pin SO Package

♦ Dual Mode Operation: Fixed or Adjustable

Output from 1.25V to 11V

♦ Large Input Range (2.7V to 11.5V)
♦ Internal 1.1Ω P-Channel Pass Transistor

Draws No Base Current

♦ Low 220mV Dropout Voltage at 200mA

Output Current

♦ 11µA (typ) Quiescent Current

♦ 1µA (max) Shutdown Mode or 7µA (typ)

Standby Mode

♦ Low-Battery Detection Comparator

♦ Reverse-Current Protection

♦ Thermal-Overload Protection

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Typical Operating Circuit

19-0275; Rev 2; 11/00

Ordering Information continued at end of data sheet.

*Dice are tested at T

J

= +25°C, DC parameters only.

Dual Mode is a trademark of Maxim Integrated Products.

MAX882
MAX883
MAX884

C

IN

O.1µF

C

OUT

2.2µF

OUTPUT
VOLTAGE

INPUT

VOLTAGE

BATTERY

LBI

OFF (STBY)

( ) ARE FOR MAX882.

IN

OUT

GNDSET

ON/OFF

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX882CPA 0°C to +70°C 8 PDIP P8-2

MAX882CSA 0°C to +70°C 8 SO S8-6F

MAX882C/D 0°C to +70°C Dice* —

MAX882EPA

8 PDIP P8-2

MAX882ESA

8 SO S8-6F

-40°C to +85°C

-40°C to +85°C

TOP VIEW

1

LBO

2

SET

GND

( ) ARE FOR MAX882.

OUT

MAX882

3

MAX883
MAX884

4

DIP/SO

8

7

6

5

LBI

OFF (STBY)

GND

IN

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= 6V (MAX883) or VIN= 4.3V (MAX882/MAX884), C

OUT

= 2.2µF, STBY or OFF = VIN, SET = GND, LBI = VIN, TJ= -40°C to

+85°C, unless otherwise noted. Typical values are at T

J

= +25°C.) (Note 1)

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.

Supply Voltage (IN or OUT to GND).......................-0.3V to +12V

Output Short-Circuit Duration ...............................................1min

Continuous Output Current ...............................................300mA

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

LBO Output Voltage and LBI,

SET, STBY, OFF Input Voltages ............-0.3V to the greater of

(IN + 0.3V) or (OUT + 0.3V)

Continuous Power Dissipation (T

J

= +70°C)

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

High-Power SO (derate 18.75mW/°C above +70°C) .......1.5W

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

Operating Temperature Ranges

MAX88_C_A........................................................0°C to +70°C

MAX88_E_A .....................................................-40°C to +85°C

Junction Temperature .....................................................+150°C

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX88_C_A 2.7

MAX88_E_A 2.9

Input Voltage Range V

IN

SET = OUT, RL =
1kΩ

MAX88_MJA 3.0

V

0°C ≤ TJ ≤ +85°C

MAX883,

-40°C ≤ TJ ≤ +85°C

0°C ≤ T

J

≤ +85°C

Output Voltage (Note 2) V

OUT

MAX882/MAX884,

-40°C ≤ TJ ≤ +85°C

V

MAX883C_A/E_A 60 100

I

OUT

= 1mA to

200mA

MAX883MJA 150

Load Regulation ∆V

LDR

I

OUT

= 1mA to

150mA

MAX882, MAX884 30 100

mV

Line Regulation ∆V

LNR

10 40 mV

I

OUT

= 100mA

220

MAX883

I

OUT

= 200mA

440

I

OUT

= 100mA

320

Dropout Voltage (Note 3) ∆V

DO

MAX882/MAX884

I

OUT

= 200mA

640

mV

MAX88_C_A/E_A 11 15

SET = OUT, VIN =
6V

MAX88_MJA 30

MAX88_C_A/E_A 15 25

Quiescent Current I

Q

VIN = 11.5V

MAX88_MJA 40

µA

11.5

11.5

11.5

I

= 100µA - 250m A,

OU T

4.75 5.00 5.25

6.0V ≤ VIN ≤ 11.5V

4.3V ≤ VIN ≤ 11.5V

(V

I

= 100µA - 250m A,

OU T

I

= 100µA - 200m A,

OU T

I

= 100µA - 200m A,

OU T

OUT

= 10mA

+ 0.5V) < VIN < 11.5V, I

OUT

4.65 5.35

3.15 3.30 3.45

3.07 3.53

110

220

160

320

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= 6V (MAX883) or VIN= 4.3V (MAX882/MAX884), C

OUT

= 2.2µF, STBY or OFF = VIN, SET = GND, LBI = VIN, TJ= -40°C to

+85°C, unless otherwise noted. Typical values are at T

J

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

MAX882C_A/E_A 7 15

STBY = 0, VIN =
6V, SET = OUT

MAX882MJA 30

MAX882C_A/E_A 10 25

STBY Quiescent Current (Note 4)

I

Q STBY

STBY = 0, VIN =

MAX882MJA 40

µA

MAX88_C_A

1

MAX88_E_A 5

OFF Quiescent Current I

Q OFF

OFF = 0, RL = 1kΩ,
V

IN

= 11.5V

MAX883/MAX884

MAX88_MJA 10

µA

MAX88_C_A 1

MAX88_E_A 3Minimum Load Current

)

VIN = 11.5V, SET =
OUT

MAX88_MJA 10

µA

V

OUT

< 0.8V

Foldback Current Limit (Note 5) ILIM

V

OUT

> 0.8V and VIN - V

OUT

> 0.7V

mA

Thermal Shutdown Temperature

T

SD

°C

Thermal Shutdown Hysteresis ∆T

SD

10 °C

V

OUT

= 4.5V MAX883_A 6 20

Reverse-Current-Protection
(Note 6)

∆V

RTH

V

OUT

= 3.0V

MAX882_A,
MAX884_A

620

mV

MAX882: VIN = 0, STBY = 0, V

OUT

= 3.0V 7

Reverse Leakage Current I

RVL

MAX883/MAX884: VIN = 0, OFF = 0, V

OUT

= 3.0V

µA

Startup Overshoot V

OSH

RL = 1kΩ, C

OUT

= 2.2µF

% of

V

OUT

Time Required to Exit OFF or
STBY Modes

T

START

VIN = 9V, RL = 33Ω, OFF from 0 to VIN, 0%
to 95% of V

OUT

µs

For internal feedback 65 30

Dual Mode SET Threshold

For external feedback

65

mV

0°C ≤ TJ ≤ +85°C

SET Reference Voltage V

SET

SET = OUT, RL =
1kΩ

-40°C ≤ T

J

≤ +85°C

V

SET Input Leakage Current I

SET

V

SET

= 1.5V or 0

nA

0°C ≤ TJ ≤ +85°C

LBI Threshold Voltage V

LBI

LBI signal falling

-40°C ≤ T

J

≤ +85°C

V

LBI Hysteresis ∆V

LBI

7mV

LBI Input Leakage Current I

LBI

V

LBI

= 1.5V

nA

LBO Output Low Voltage V

LBOL

I

LBO

sink = 1.2mA, V

LBI

= 1V, 3V < VIN <

11.5V, SET = OUT

90 250 mV

LBO Output Leakage Current

V

LBI

= VIN, V

LBO

= V

IN

0.1 µA

MAX88_C_A

1

MAX88_E_A 3OUT Leakage Current

VIN = 11.5V, V

OUT

= 2V, SET = OUT

MAX88_MJA 10

µA

SYMBOL

MIN TYP MAX

11.5V, SET = OUT

I

OUT(MIN

V

SET TH

I

BLO LKG

I

OUT LKG

150

1.16 1.20 1.24

1.12 1.28

1.15 1.20 1.25

1.11 1.29

0.01

170

430

+160

0.01

200

±0.01 ±50

±0.01 ±50

0.01

0.01

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

4 _______________________________________________________________________________________

Note 1:Electrical specifications are measured by pulse testing and are guaranteed for a junction temperature (TJ) within the operat-

ing temperature range, unless otherwise noted. Specifications to -40°C are guaranteed by design and not production tested.

Note 2:(V

IN

- V

OUT

) is limited to keep the product (I

OUT

x (VIN- V

OUT

)) from exceeding the package power dissipation limits. See

Figure 5. Therefore, the combination of high output current and high supply voltage is not tested.

Note 3:Dropout Voltage is (V

IN

- V

OUT

) when V

OUT

falls to 100mV below its nominal value at VIN= (V

OUT

+ 2V). For example, the

MAX883 is tested by measuring the V

OUT

at VIN= 7V, then VINis lowered until V

OUT

falls 100mV below the measured value.

The difference (VIN- V

OUT

) is then measured and defined as ∆VDO.

Note 4:Since standby mode inhibits the output but keeps all biasing circuitry alive, the Standby Quiescent Current is similar to the

normal operating quiescent current.

Note 5:Foldback Current Limit was characterized by pulse testing to remain below the maximum junction temperature (not

production tested).

Note 6:The Reverse-Current Protection Threshold is the output/input differential voltage (V

OUT

- VIN) at which reverse-current

protection switchover occurs and the pass transistor is turned off. See the section Reverse-Current Protection in the Detailed

Description.

Note 7:Noise is tested using a bandpass amplifier with two poles at 10Hz and two poles at 10kHz.

ELECTRICAL CHARACTERISTICS (continued)

(VIN= 6V (MAX883) or VIN= 4.3V (MAX882/MAX884), C

OUT

= 2.2µF, STBY or OFF = VIN, SET = GND, LBI = VIN, TJ= -40°C to

+85°C, unless otherwise noted. Typical values are at T

J

= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

STBY Threshold Voltage V

STBY

STBY signal falling, MAX882_A

V

STBY Hysteresis

MAX882_A 7 mV

STBY Input Leakage Current I

STBY

V

STBY

= VIN or 0, MAX882_A

nA

V

IL OFF

In off mode, MAX883_A, MAX884_A 0.4

In on mode, SET = OUT, VIN < 6V,
MAX883_A, MAX884_A

2.0

OFF Threshold Voltage

In on mode, SET = OUT, 6V < VIN < 11.5V,
MAX883_A, MAX884_A

3.0

V

OFF Input Leakage Current I

OFF

V

OFF

= VIN or 0

nA

Output Noise e

n

10Hz to 10kHz, SET = OUT, RL = 1kΩ,
C

OUT

= 2.2µF (Note 7)

µV

RMS

SYMBOL

∆V

STBY

V

IH OFF

MIN TYP MAX

1.15 1.20 1.25

±0.01 ±50

±0.01 ±50

250

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VIN= 7V for MAX883, VIN = 5.3V for MAX882/MAX884, OFF or STBY = VIN, SET = GND, LBI = VIN, LBO = OPEN, CIN= C

OUT

= 2.2µF,

R

L

= 1kΩ, TA = +25°C, unless otherwise noted.)

95

101

100

99

98

97

96

0.01 0.1 1 10010 250

OUTPUT VOLTAGE AND QUIESCENT

CURRENT vs. LOAD CURRENT

MAX882/4-01

LOAD CURRENT (mA)

NORMALIZED OUTPUT VOLTAGE (%)

V

OUT

= 5V (MAX883)

V

OUT

= 3.3V (MAX882/MAX884)

OUTPUT VOLTAGE
NORMALIZED TO OUTPUT
VOLTAGE AT 1mA

0

5

10

15

20

25

30

QUIESCENT CURRENT (µA)

I

Q

0

2

3

4

5

6

4

6

8

10

12

14

16

OUTPUT VOLTAGE AND QUIESCENT

CURRENT vs. SUPPLY VOLTAGE

MAX882/4-03

SUPPLY VOLTAGE (V)

OUTPUT VOLTAGE (V)

QUIESCENT CURRENT (µA)

2 3 4 5 6 7 8 9 10 11 12

V

OUT

= 5V (MAX883)

V

OUT

= 3.3V (MAX882/MAX884)

IQ (MAX882/MAX884)

IQ (MAX883)

1

0

0.1

0.2

0.3

0.4

0.5

0.6

DROPOUT VOLTAGE

vs. LOAD CURRENT

MAX882/4-05

LOAD CURRENT (mA)

DROPOUT VOLTAGE (V)

0 50 100 150 200 250 300

V

OUT

= 3.3V (MAX882/MAX884)

V

OUT

= 5V (MAX883)

0

15

12

9

6

3

QUIESCENT CURRENT

vs. TEMPERATURE

MAX882/4-04

TEMPERATURE (°C)

QUIESCENT CURRENT (µA)

-55 -35 -15 5 25 45 65 85 105 125

10Hz to 10kHz OUTPUT NOISE

10ms/div

OUTPUT NOISE (1mV/div)

MAX883
V

OUT

= 5V

MAX882/4-06

96

97

98

99

100

101

102

103

104

OUTPUT VOLTAGE

vs. TEMPERATURE

MAX882/4-04a

TEMPERATURE (°C)

NORMALIZED OUTPUT VOLTAGE (%)

-55 -35 -15 5 25 45 65 85 105 125

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

6 _______________________________________________________________________________________

LINE-TRANSIENT RESPONSE

500µs/div

MAX883: V

OUT

= 5V, CIN = 0µF, tR = 15µs, tF = 13µs

A: V

IN

= 8V (HIGH) / VIN = 7V (LOW)

B: OUTPUT VOLTAGE (100mV/div)

B

A

LOAD-TRANSIENT RESPONSE

1ms/div

MAX883: V

OUT

= 5V, tR = 24µs, tF = 44µs
A: OUTPUT VOLTAGE (100mV/div)
B: I

OUT

= 250mA (HIGH) / I

OUT

= 50mA (LOW)

B

A

OVERSHOOT AND TIME

EXITING SHUTDOWN MODE

RL = 100Ω

500µs/div

A: OFF PIN VOLTAGE (1V/div):
RISE TIME = 9µs
B: MAX883 OUTPUT VOLTAGE (1V/div):
DELAY = 135µs, RISE TIME = 67µs,
OVERSHOOT = 0%

0V

5V

A

B

0

1

2

3

4

5

0.1 1 10 50

LBO LOW VOLTAGE

vs. SINK CURRENT

MAX882/4-10

SINK CURRENT (mA)

LBO LOW VOLTAGE (V)

MAX882/MAX884

MAX883

Typical Operating Characteristics (continued)

(VIN= 7V for MAX883, VIN= 5.3V for MAX882/MAX884, OFF or STBY = VIN, SET = GND, LBI = VIN, LBO = OPEN, CIN= C

OUT

= 2.2µF,

R

L

= 1kΩ, TA = +25°C, unless otherwise noted.)

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

_______________________________________________________________________________________ 7

_______________Detailed Description

The MAX882/MAX883/MAX884 are micropower, low­dropout linear regulators designed primarily for battery­powered applications. They feature Dual Mode operation,
allowing a fixed output of 5V for the MAX883 and 3.3V for
the MAX882/MAX884, or an adjustable output from 1.25V
to 11V. These devices supply up to 200mA while requiring
less than 15µA quiescent current. As illustrated in Figure
1, they consist of a 1.20V reference, error amplifier, MOS­FET driver, P-channel pass transistor, dual-mode com­parator, and feedback voltage-divider.

The 1.20V reference is connected to the error amplifier’s
inverting input. The error amplifier compares this refer­ence with the selected feedback voltage and amplifies
the difference. The MOSFET driver reads the error signal
and applies the appropriate drive to the P-channel pass
transistor. If the feedback voltage is lower than the refer­ence, the pass transistor’s gate is pulled lower, allowing
more current to pass and increasing the output voltage. If
the feedback voltage is too high, the pass transistor gate
is pulled up, allowing less current to pass to the output.

The output voltage is fed back through either an inter­nal resistor voltage-divider connected to the OUT pin,
or an external resistor network connected to the SET
pin. The dual-mode comparator examines the SET pin
voltage and selects the feedback path used. If the SET
pin is below 65mV, internal feedback is used and the
output voltage is regulated to 5V for the MAX883 or

3.3V for the MAX882/MAX884. Additional blocks
include a foldback current limiter, reverse-current pro­tection, a thermal sensor, shutdown or standby logic,
and a low-battery-detection comparator.

Internal P-Channel Pass Transistor

The MAX882/MAX883/MAX884 feature a 200mA P­channel MOSFET pass transistor. This provides several
advantages over similar designs using PNP pass tran­sistors, including longer battery life.

The P-channel MOSFET requires no base drive, which
reduces quiescent current considerably. PNP-based reg­ulators waste large amounts of current in dropout when
the pass transistor saturates. They also use high base­drive currents under large loads. The MAX882/MAX883/
MAX884 do not suffer from these problems and consume
only 11µA of quiescent current during light loads, heavy
loads, and dropout.

Output Voltage Selection

The MAX882/MAX883/MAX884 feature Dual Mode
operation. In preset voltage mode, the MAX883’s out­put is set to 5V and the MAX882/MAX884’s output is set
to 3.3V, using internal trimmed feedback resistors.
Select this mode by connecting SET to ground.

In preset voltage mode, impedances between SET and
ground should be less than 100kΩ. Otherwise, spurious
conditions could cause the voltage at SET to exceed
the 65mV dual-mode threshold.

Pin Description

LBO

SET

GND

OUT

LBI

OFF

STBY

IN

1 1

Low-Battery Output is an open-drain output that goes low when LBI is less than 1.2V. Connect to
IN or OUT through a pull-up resistor. LBO is undefined during shutdown mode
(MAX883/MAX884).

2 2

Feedback for setting the output voltage. Connect to GND to set the output voltage to the prese­lected 3.3V or 5V. Connect to an external resistor network for adjustable-output operation.

3, 6 3, 6

Ground pins—also function as heatsinks in the SO package. All GND pins must be soldered to
the PC board for proper power dissipation. Connect to large copper pads or planes to
channel heat from the IC.

4 4

Regulator Output. Fixed or adjustable from 1.25V to 11.0V. Sources up to 200mA. Bypass with a

2.2µF capacitor.

8 8 Low-Battery comparator Input. Tie to IN when not used.

— 7

Shutdown. Active-low logic input. In OFF mode, supply current is reduced below 1µA and
V

OUT

= 0.

7 —

Standby. Active-low comparator input. Connect to GND to disable the output or to IN for normal
operation. A resistor network (from IN) can be used to set a standby mode threshold.

5 5 Regulator Input. Supply voltage can range from 2.7V to 11.5V.

NAME

PIN

FUNCTION

MAX883/

MAX884

MAX882

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

8 _______________________________________________________________________________________

In adjustable mode, the user selects an output voltage
in the 1.25V to 11V range by connecting two external
resistors, used as a voltage-divider, to the SET pin
(Figure 2).

The output voltage is set by the following equation:

where V

SET

= 1.20V.

To simplify resistor selection:

Since the input bias current at SET is nominally zero,
large resistance values can be used for R1 and R2 to
minimize power consumption without losing accuracy.
Up to 1.5MΩ is acceptable for R2. Since the V

SET

toler­ance is less than ±40mV, the output can be set using
fixed resistors instead of trim pots.

Standby Mode (MAX882)

The MAX882 has a standby feature that disconnects
the input from the output when STBY is brought low, but
keeps all other circuitry awake. In this mode, V

OUT

drops to 0, and the internal biasing circuitry (including
the low-battery comparator) remains on. The maximum
quiescent current during standby is 15µA. STBY is a
comparator input with the other input internally tied to
the reference voltage. Use a resistor network as shown
in Figure 3 to set a standby-mode threshold voltage for
undervoltage lockout. Connect STBY to IN for normal
operation.

OFF Mode (MAX883/MAX884)

A low-logic input on the OFF pin shuts down the
MAX883/MAX884. In this mode, the pass transistor,
control circuit, reference, and all biases are turned off,
and the supply current is reduced to less than 1µA.
LBO is undefined in OFF mode. Connect OFF to IN for
normal operation.

R1 R2

V

V

1

OUT

SET

=−

⎛
⎝

⎜

⎞
⎠

⎟

VV

R

R

OUT SET

=+

⎛
⎝

⎜

⎞
⎠

⎟

1

1
2

Figure 1. MAX882/MAX883/MAX884 Functional Diagram

P

OUT

SET

R1

R2

65mV

ERROR AMP

OFF

(STBY)

GND

LBO

LBI

N

IN

MOSFET DRIVER

WITH FOLDBACK

CURRENT LIMIT

REVERSE­CURRENT

PROTECTION

SHUT­DOWN
LOGIC

1.20V

REFERENCE

THERMAL

SENSOR

( ) ARE FOR MAX882.

DUAL-MODE

COMPARATOR

LOW-BATTERY
COMPARATOR

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

_______________________________________________________________________________________ 9

Foldback Current Limiting

The MAX882/MAX883/MAX884 also include a foldback
current limiter. It monitors and controls the pass transis­tor’s gate voltage, estimating the output current and
limiting it to 430mA for output voltages above 0.8V and
(VIN- V

OUT

) > 0.7V. If the output voltage drops below

0.8V, implying a short-circuit condition, the output cur­rent is limited to 170mA. The output can be shorted to
ground for 1min without damaging the device if the
package can dissipate (VINx 170mA) without exceed­ing TJ= +150°C. When the output is greater than 0.8V
and (VIN- V

OUT

) < 0.7V (dropout operation), no current

limiting is allowed, to provide maximum load drive.

Thermal Overload Protection

Thermal overload protection limits total power dissipa­tion in the MAX882/MAX883/MAX884. When the junc­tion temperature exceeds TJ= +160°C, the thermal
sensor sends a signal to the shutdown logic, turning off
the pass transistor and allowing the IC to cool. The
thermal sensor turns the pass transistor on again after
the IC’s junction temperature cools by 10°C, resulting in
a pulsed output during thermal overload conditions.

Thermal overload protection is designed to protect the
MAX882/MAX883/MAX884 if fault conditions occur. It is
not intended to be used as an operating mode.
Prolonged operation in thermal-shutdown mode may
reduce the IC’s reliability. For continual operation, do
not exceed the absolute maximum junction temperature
rating of TJ= +150°C.

Power Dissipation and Operating Region

Maximum power dissipation of the MAX882/MAX883/
MAX884 depends on the thermal resistance of the case
and PC board, the temperature difference between the
die junction and ambient air, and the rate of
air flow. The power dissipation across the device is
P = I

OUT(VIN

- V

OUT

). The resulting power dissipation

is as follows:

where (TJ - TA) is the temperature difference between
the MAX882/MAX883/MAX884 die junction and the sur­rounding air, θJB(or θJC) is the thermal resistance of
the package chosen, and θBAis the thermal resistance
through the PC board, copper traces, and other materi­als to the surrounding air.

The 8-pin small-outline package for the MAX882/
MAX883/MAX884 features a special lead frame with a
lower thermal resistance and higher allowable power
dissipation. This package’s thermal resistance package
is θJB= 53°C/W, compared with θJB= 110°C/W for an
8-pin plastic DIP package and θJB= 125°C/W for an 8­pin ceramic DIP package.

P

(T T )

()

JA

JB BA

=

−
+θθ

Figure 2. Adjustable Output Using External Feedback
Resistors

Figure 3. Setting an Undervoltage Lockout Threshold Using
STBY

MAX882
MAX883
MAX884

C

IN

O.1µF

C

OUT

2.2µF

OUTPUT

VOLTAGE

INPUT
VOLTAGE

LBI

OFF
(STBY)

( ) ARE FOR MAX882.

IN

R1

R2

R1 + R2

R2

V

OUT

= V

SET

, V

SET

= 1.20V

LOAD

OUT

GND

SET

C

OUT

2.2µF

OUTPUT

VOLTAGE

STBY

R1+ R2

R2

IN
LBI

STBY

, V

STBY

MAX882

GND

= 1.20V

INPUT
VOLTAGE

R1

C

IN

STBY TRIP

R2

= V

O.1µF

V

OUT

SET

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

10 ______________________________________________________________________________________

The GND pins of the MAX882/MAX883/MAX884 SOIC
package perform the dual function of providing an elect­rical connection to ground and channeling heat away. Con­nect all GND pins to ground using a large pad or ground
plane. Where this is impossible, place a copper plane on an
adjacent layer. For a given power dissipation, the pad
should exceed the associated dimensions in Figure 4.

Figure 4 assumes the IC is in an 8-pin small-outline pack­age that has a maximum junction temperature of +125°C
and is soldered directly to the pad; it also has a +25°C
ambient air temperature and no other heat sources. Use
larger pad sizes for other packages, lower junction tem­peratures, higher ambient temperatures, or conditions
where the IC is not soldered directly to the heat-sinking
ground pad. When operating C- and E-grade parts up to a
TJof +125°C, expect performance similar to M-grade
specifications. For TJ between +125°C and +150°C, the
output voltage may drift more.

The MAX882/MAX883/MAX884 can regulate currents up
to 250mA and operate with input voltages up to 11.5V, but
not simultaneously. High output currents can only be sus­tained when input-output differential voltages are small, as
shown in Figure 5. Maximum power dissipation depends
on packaging, temperature, and air flow. The maximum
output current is as follows:

where P is derived from Figure 4.

I

P(T T )

(V V )100 C

OUT(MAX)

JA

IN OUT

=

−

−°

1.0

0.9

1.6

1.5

1.4

1.3

1.2

1.1

0.1cm

2

0.0155in

2

1cm

2

0.155in

2

10cm

2

1.55in

2

100cm

2

15.5in

2

MAX882/4-fig04

COPPER GROUND PAD AREA

POWER DISSIPATION (W)

MAX883, V

OUT

= 5V

8-PIN SO PACKAGE

77.4cm

2

,

SINGLE-SIDED BOARD
1oz COPPER

GLASS EPOXY,
T

J

= +125°C,

T

A

= +25°C, STILL AIR

Figure 4. Typical Maximum Power Dissipation vs. Ground Pad
Area

Figure 5a. Safe Operating Regions: MAX882/MAX884 Maximum
Output Current vs. Supply Voltage

Figure 5b. Safe Operating Regions: MAX883 Maximum Output
Current vs. Supply Voltage

250

MAXIMUM CURRENT

200

150

PLASTIC DIP

100

50

MAXIMUM OUTPUT CURRENT (mA)

0

CERAMIC DIP

OPERATING
REGION AT
TA = +25°C
T

= +125°C

TYPICAL DROPOUT VOLTAGE LIMIT

J

5432768109111312

SUPPLY VOLTAGE (V)

MAXIMUM POWER
DISSIPATION LIMIT

HIGH-

POWER

SOIC

MAX882/4-05a

MAXIMUM SUPPLY VOLTAGE LIMIT

250

MAXIMUM CURRENT

200

150

100

50

MAXIMUM OUTPUT CURRENT (mA)

0

PLASTIC DIP

OPERATING
REGION AT
TA = +25°C
TJ = +125°C

TYPICAL DROPOUT VOLTAGE LIMIT

54768109111312

SUPPLY VOLTAGE (V)

MAXIMUM POWER
DISSIPATION LIMIT

CERAMIC DIP

HIGH-

POWER

SOIC

MAX882/4-05b

MAXIMUM SUPPLY VOLTAGE LIMIT

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

______________________________________________________________________________________ 11

Reverse-Current Protection

The MAX882/MAX883/MAX884 have a unique protection
scheme that limits reverse currents when the input volt­age falls below the output. It monitors the voltages on IN
and OUT and switches the IC’s substrate and power bus
to the more positive of the two. The control circuitry is
then able to remain functioning and turn the pass transis­tor off, limiting reverse currents back through to the input
of the device. In this mode, typical current into OUT to
GND is 15µA at V

OUT

= 3.3V and 50µA at V

OUT

= 5V.

Reverse-current protection activates when the voltage
on IN falls 6mV (or 20mV max) below the voltage on
OUT. Before this happens, currents as high as several
milliamperes can flow back through the device.

Low-Battery-Detection Comparator

The MAX882/MAX883/MAX884 provide a low-battery com­parator that compares the voltage on the LBI pin to the

1.20V internal reference. LBO, an open-drain output, goes
low when LBI is below 1.20V. Hysteresis of 7mV has been
added to the low-battery comparator to provide noise
immunity during switching. LBO remains functional in stand­by mode for the MAX882, but is undefined in OFF mode for
the MAX883 and MAX884. Tie LBI to IN when not used.

Use a resistor-divider network as shown in Figure 6 to set
the low-battery trip voltage. Current into the LBI input is
±50nA (max), so R2 can be as large as 1MΩ. Add extra
noise immunity by connecting a small capacitor from LBI
to GND. Additional hysteresis can be added by connect­ing a high-value resistor from LBI to LBO.

Applications Information

The MAX882/MAX883/MAX884 are series linear regula­tors designed primarily for battery-powered systems.
Figure 7 shows a typical application.

Standby Mode vs. OFF Mode

STBY is a comparator input that allows the user to set
the standby-mode threshold voltage, while OFF is a
logic-level input. When in standby mode, the output is
disconnected from the input, but the biasing circuitry
(including the low-battery comparator) is kept alive,
causing the device to draw approximately 7µA.
Standby mode is useful in applications where a low­battery comparator function is still needed in shutdown.

A logic low at the OFF pin turns off all biasing circuitry,
including the LBI/LBO comparator, and reduces supply
current to less than 1µA. OFF mode is useful for maxi­mizing battery life. There is little difference in the time it
takes to exit standby mode or OFF mode.

Output Capacitor Selection

and Regulator Stability

An output filter capacitor is required at the MAX882/
MAX883/MAX884 OUT pin. The minimum output
capacitance required for stability is 2.2µF.

MAX882
MAX883
MAX884

C

IN

O.1µF

C

OUT

2.2µF

OUTPUT

VOLTAGE

BATTERY

LBOLBI

OFF (STBY)

( ) ARE FOR MAX882.

IN

POWER­FAIL
INDICATION

R3

R1 + R2

R2

V

LBI TRIP

= V

LBI

, V

LBI

= 1.20V

OUT

GND

SET

R1

R2

Figure 6. Using the Low-Battery Comparator to Monitor Battery
Voltage

Figure 7. Typical 3.3V or 5V Linear Regulator Circuit

OFF (STBY)ON/OFF

INPUT

VOLTAGE

BATTERY

* OPTIONAL REVERSE BATTERY PROTECTION

*

C

IN

O.1µF

( ) ARE FOR MAX882.

IN

LBI

SET

MAX882
MAX883
MAX884

GND

OUT

OUTPUT

VOLTAGE

C

OUT

2.2µF

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

12 ______________________________________________________________________________________

The filter capacitor’s size depends primarily on the
desired power-up time and load-transient responses.
Load-transient response is improved by using larger
output capacitors.

The output capacitor’s equivalent series resistance
(ESR) will not affect stability as long as the minimum
capacitance requirement is observed. The type of
capacitor selected is not critical, but it must remain
above the minimum value over the full operating temper­ature range.

Input Bypass Capacitor

Normally, use 0.1µF to 10µF capacitors on the MAX882/
MAX883/MAX884 input. The best value depends pri­marily on the power-up slew rate of VIN, and on load
and line transients. Larger input capacitor values pro­vide better supply-noise rejection and line-transient
response, as well as improved performance, when the
supply has a high AC impedance. The type of input
bypass capacitor used is not critical.

Noise

The MAX882/MAX883/MAX884 exhibit up to 4mV

p-p

of
noise during normal operation. This is negligible in
most applications. When using the MAX882/MAX883/
MAX884 for applications that include analog-to-digital
converters (ADCs) with resolutions greater than 12 bits,
consider the ADC’s power-supply rejection specifica­tions. See the output noise plot in the Typical Operating
Characteristics section.

PSRR and Operation from

Sources Other than Batteries

The MAX882/MAX883/MAX884 are designed to
achieve low dropout voltages and low quiescent cur­rents in battery-powered systems. However, to gain
these benefits, the devices must trade away power­supply noise rejection, as well as swift response to sup­ply variations and load transients. For a 1mA load
current, power-supply rejection ranges from 60dB
down to 20dB at 2kHz. At higher frequencies, the cir­cuit depends primarily on the characteristics of the out­put capacitor, and the PSRR increases (Figure 8).

0

60

50

40

30

20

10

10

1

10210310410

5

10

6

MAX882/4-8b

FREQUENCY (Hz)

PSRR (dB)

A: C

OUT

= 1µF

B: C

OUT

= 10µF

C: C

OUT

= 100µF

A

B

C

MAX883
∆VIN = 1V

P-P

CIN = 0µF
I

OUT

= 100mA

Figure 8b. Power-Supply Rejection Ratio vs. Ripple Frequency
for Various Output Capacitances

Figure 8a. Power-Supply Rejection Ratio vs. Ripple Frequency
for Light and Heavy Loads

80

70

60

50

40

PSRR (dB)

30

MAX884

20

∆VIN = 1V

P-P

CIN = 0µF

10

C

= 2.2µF

OUT

0

0101102103104105106

10

I

OUT

FREQUENCY (Hz)

= 1mA

I

OUT

= 100mA

MAX882/4-8a

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

______________________________________________________________________________________ 13

When operating from sources other than batteries, sup­ply-noise rejection and transient response can be
improved by increasing the values of the input and out­put capacitors and employing passive filtering tech­niques. Do not use power supplies with ripple voltage
exceeding 200mV at 100kHz.

Overshoot and Transient Considerations

The Typical Operating Characteristics section shows
power-up, supply, and load-transient response graphs.
On the load-transient graphs, two components of the
output response can be observed: a DC shift from the
output impedance due to the different load currents,
and the transient response. Typical transients for step
changes in the load current from 50mA to 250mA are
200mV. Increasing the output capacitor’s value attenu­ates transient spikes.

During recovery from shutdown, overshoot is negligible
if the output voltage has been given time to decay ade­quately. During power-up from VIN= 0, overshoot is
typically less than 1% of V

OUT

.

Input-Output (Dropout) Voltage

A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable sup­ply voltage. In battery-powered systems, this deter­mines the useful end-of-life battery voltage. Because
the MAX882/MAX883/MAX884 use a P-channel MOS­FET pass transistor, their dropout voltage is a function
of R

DS(ON)

multiplied by the load current (see Electrical
Characteristics). Quickly stepping up the input voltage
from the dropout voltage can result in overshoot.

Short-Term Battery Backup

Using the MAX882

Figure 9 illustrates a scheme for implementing battery
backup for 3.3V circuits using the MAX882. When the
supply voltage drops below some user-specified value
based on resistors R1 and R2, the standby function
activates, turning off the MAX882’s output. Under
these conditions, the backup battery supplies power to
the load. Reverse current protection prevents the bat­tery from draining back through the regulator to the
input.

This application is limited to short-term battery backup
for 3.3V circuits. The current drawn by the MAX882’s
OUT pin at 3.3V during reverse-current protection is
typically 8µA. It should not be used with the MAX883
and MAX884, since the OFF pin is a logic input, and
indeterminate inputs can cause the regulator to turn on
intermittently, draining the battery.

Reverse Battery Protection

Reverse battery protection can be added by including
an inexpensive Schottky diode between the battery
input and the regulator circuit, as shown in Figure 7.
However, the dropout voltage of the regulator will be
increased by the forward voltage drop of the diode. For
example, the forward voltage of a standard 1N5817
Schottky diode is typically 0.29V at 200mA.

BACKUP

BATTERY

MAX882

C

IN

O.1µF

C

OUT

2.2µF

OUTPUT

VOLTAGE

INPUT
VOLTAGE

LBI

SET

STBY

IN

D2

R1

R2

OUT

GND

Figure 9. Short-Term Battery Backup Using the MAX882

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

14 ______________________________________________________________________________________

Ordering Information (continued) ___________________Chip Topography

*Dice are tested at TJ= +25°C, DC parameters only.

SET

OUT

IN

0.085"

(2.159mm)

0.080"

(2.032mm)

OUT

LBI

OFF (MAX883/4)

STBY (MAX882)

GNDLB0

TRANSISTOR COUNT: 151

NO DIRECT SUBSTRATE CONNECTION. THE N-SUB­STRATE IS INTERNALLY SWITCHED BETWEEN THE
MORE POSITIVE OF IN OR OUT.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX883CPA 0°C to +70°C 8 PDIP P8-2

MAX883CSA 0°C to +70°C 8 SO S8-6F

MAX883C/D 0°C to +70°C Dice* —

MAX883EPA

8 PDIP P8-2

MAX883ESA

8 SO S8-6F

MAX884CPA 0°C to +70°C 8 PDIP P8-2

MAX884CSA 0°C to +70°C 8 SO S8-6F

MAX884C/D 0°C to +70°C Dice* —

MAX884EPA

8 PDIP P8-2

MAX884ESA

8 SO S8-6F

Revision History

Pages changed at Rev 2: 1–4, 14, 15

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 200mA Linear Regulators

______________________________________________________________________________________ 15

PDIPN.EPS

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 [phone]

© 2000 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

MAX882/MAX883/MAX884

5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SOICN .EPS

PACKAGE OUTLINE, .150" SOIC

1

1

21-0041

B

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

TOP VIEW

FRONT VIEW

MAX

0.010

0.069

0.019

0.157

0.010

INCHES

0.150

0.007

E

C

DIM

0.014

0.004

B

A1

MIN

0.053A

0.19

3.80 4.00

0.25

MILLIMETERS

0.10

0.35

1.35

MIN

0.49

0.25

MAX

1.75

0.050

0.016L

0.40 1.27

0.3940.386D

D

MINDIM

D

INCHES

MAX

9.80 10.00

MILLIMETERS

MIN

MAX

16

AC

0.337 0.344 AB8.758.55 14

0.189 0.197 AA5.004.80 8

N MS012

N

SIDE VIEW

H 0.2440.228 5.80 6.20

e 0.050 BSC 1.27 BSC

C

HE

e

B

A1

A

D

0∞-8∞

L

1

VARIATIONS: