Maxim MAX1616EUK-T, MAX1615EUK-T Datasheet

________________General Description

The MAX1615/MAX1616 are micropower, SOT23-5 lin­ear regulators that supply always-on, keep-alive power
to CMOS RAM and microcontrollers (µCs) in systems
with high-voltage batteries. Key features include wide
input voltage range, low dropout voltage, and low qui­escent supply current.

Despite a miserly 8µA (max) no-load supply current, the
MAX1615/MAX1616 have excellent line-transient
response and AC power-supply rejection ratio. They
provide a clean, fixed 5V or 3.3V output (MAX1615) or
an adjustable 1.24V to 28V output (MAX1616), even
when subjected to fast supply-voltage changes that
occur during the switchover from battery to AC adapter
input power. The space-saving SOT23-5 package has
excellent thermal characteristics and tolerates up to
571mW of power dissipation. Fault protection is provid­ed by internal foldback current limiting and thermal­shutdown circuitry.

________________________Applications

CMOS/RTC Backup Power
Microcontroller Power
Notebook Computers
Smart-Battery Packs
PDAs and Handy-Terminals
Battery-Powered Systems

____________________________Features

♦ 4V to 28V Input Range
♦ 8µA (max) Quiescent Supply Current
♦ <1µA Shutdown Supply Current
♦ 3.3V or 5V, Pin-Selectable Output (MAX1615)

Adjustable 1.24V to 28V Output (MAX1616)

♦ 30mA Output Current
♦ ±2% Initial Output Accuracy
♦ Thermal-Overload Protection
♦ 5-Pin SOT23 Package
♦ Low Cost

MAX1615/MAX1616

High-Voltage, Low-Power Linear Regulators

for Notebook Computers

________________________________________________________________

Maxim Integrated Products

1

GND

5/3 (FB)

OUT

( ) ARE FOR MAX1616.

1

5

SHDN

IN

MAX1615
MAX1616

SOT23-5

TOP VIEW

2

3

4

___________________Pin Configuration

IN

OUT

SHDN
GND 5/3

BATTERY

C

IN

0.1µF

C

OUT

4.7µF

OUTPUT
VOLTAGE

MAX1615

____________Typical Operating Circuit

19-1225; Rev 2; 1/98

PART

MAX1615EUK-T

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5

_______________Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]
For small orders, phone [phone] ext. 3468.

SOT

TOP MARK

ABZD

MAX1616EUK-T

ABZE-40°C to +85°C 5 SOT23-5

V

MAX1615/MAX1616

High-Voltage, Low-Power Linear Regulators
for Notebook Computers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= 15V, SHDN = VIN, I

LOAD

= 5µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

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 to GND .................................................................-0.3V to 30V

Terminal Voltages to GND

SHDN to GND...........................................-0.3V to (V

IN

+ 0.3V)

5/3 to GND ............................................-0.3V to (V

OUT

+ 0.3V)

FB (MAX1616) to GND .........................-0.3V to (V

OUT

+ 0.3V)

OUT to GND...........................................................-0.3V to 30V

OUT Short-Circuit to GND ...............................................30sec

Continuous OUT Current.....................................................40mA

Continuous Power Dissipation (T

A

= +70°C) (Note 1)

SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW

Operating Temperature Range

MAX161_EUK-T ...............................................-40°C to +85°C

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

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

Note 1: See

Operating Region and Power Dissipation

section.

FB Input Current (MAX1616) I

FB

-10 12 30 nAVFB= 1.3V

FB Threshold (MAX1616)
(Note 3)

V

FBT

1.215 1.240 1.265

V

FB = OUT,
VIN= 6V to 28V

TA= +25°C,
I

LOAD

= 1mA

1.18 1.28

TA= T

MIN

to T

MAX

,

I

LOAD

= 5µA to 30mA

Output Voltage (MAX1615)
(Note 3)

3.15 3.48

I

LOAD

= 5µA to 30mA,

TA= T

MIN

to T

MAX

,

VIN= 6V to 28V

5/3 = GND

4.75 5.25

5/3 = OUT

4.95 5.05 5.15

5/3 = OUT

3.26 3.33 3.40

I

LOAD

= 1mA,
TA= +25°C,
VIN= 6V to 28V

5/3 = GND

Dropout Supply Current 70 µA

Output set to 5V,
VIN= 4V

TA= +25°C

T

MIN

= T

MIN

to T

MAX

TA= +25°C

Start-Up Overshoot V

OSH

0.5 %V

OUT

RL= 500Ω, C

OUT

= 10µF within 90% of nominal

output voltage

PARAMETER SYMBOL MIN TYP MAX UNITS

Shutdown Supply Current I

IN

3

µA

1.5

Minimum Load Current 5 µA

Input Voltage Range V

IN

4 28 V

6.2 8

Supply Current I

IN

15

µA

Output Current Limit 100 mA
OUT Reverse Leakage

Current

70 µA

Capacitive Load
Requirements (Note 5)

0.16
µF/mA

Start-Up Time Response 1 ms

CONDITIONS

SHDN = GND
(shutdown mode)

VIN= 6V
IN = unconnected, V

OUT

forced to 5V

SHDN = IN, TA= +25°C

MAX1615

SHDN = IN, VIN= 6V to 28V, TA= T

MIN

to T

MAX

Rising edge of IN or SHDN to OUT within specifi­cation limits, R

L

= 500Ω, C

OUT

= 6.8µF,

V

OUT

set to 5V

MAX1616 0.23

Dropout Voltage ∆V

DO

350 mVI

LOAD

= 30mA (Note 4)

V

MAX1615/MAX1616

High-Voltage, Low-Power Linear Regulators

for Notebook Computers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= 15V, SHDN = VIN, I

LOAD

= 5µA, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

Note 2: Limits are 100% production tested at T

A

= +25°C. Limits over the operating temperature range are guaranteed through

correlation using standard quality-control (SQC) methods.

Note 3: Pulse tested at V

IN

= 28V, I

LOAD

= 30mA to avoid exceeding package power-dissipation limits.

Note 4: Guaranteed by design. Tested with V

OUT

set to 5V. Dropout voltage is tested by reducing the input voltage until V

OUT

drops

to 100mV below its nominal value, measured with V

IN

starting 2V above V

OUT

.

Note 5: Use at least 1µF minimum for light loads. Add 0.125µF/mA (0.2µF/mA for the MAX1616) for loads greater than 100µA,

not production tested. See

Capacitor Selection

in the

Applications Information

section.

60

0

0 30

SAFE LOAD-CURRENT

OPERATING AREA

vs. SUPPLY VOLTAGE

20

10

50

MAX1615-01

SUPPLY VOLTAGE (V)

OUTPUT CURRENT (mA)

105 252015

40

30

POWER­DISSIPATION
LIMIT REGION

V

OUT

= 5V

8

0

5 30

GROUND CURRENT

vs. SUPPLY VOLTAGE

AT VARIOUS LOADS

2

3

1

6

7

MAX1615-02

SUPPLY VOLTAGE (V)

GROUND CURRENT (mA)

10 252015

5
4

65mA

55mA

45mA

35mA

15mA

5mA

25mA

9.0

5.0
5 30

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

6.0

6.5

5.5

8.0

8.5

MAX1615-03

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

25201510

7.5

7.0

TA = +85°C

TA = +25°C

TA = -40°C

__________________________________________Typical Operating Characteristics

(V

OUT

set to 5V, TA = +25°C, unless otherwise noted.)

SHDN Input Threshold
Voltage

CONDITIONS

V

0.25V

IL

UNITSMIN TYP MAXSYMBOLPARAMETER

SHDN Input Current

V

SHDN

= 0V or 15V µA-1 1

Thermal-Shutdown
Temperature

V

SHDN

= 0V or 15V, hysteresis = +20°C °C150T

SHDN

V

IH

1.4