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________________General Description

The MAX1615/MAX1616 are micropower, SOT23-5 lin-

ear 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 qui-

escent 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 provid-

ed by internal foldback current limiting and thermal-

shutdown circuitry. The MAX1615/MAX1616 are now

available in lead-free packages.

________________________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.

SHDN

MAX1615

MAX1616

SOT23-5

TOP VIEW

___________________Pin Configuration

OUT

SHDN

GND 5/3

BATTERY

0.1µF

OUT

4.7µF

OUTPUT

VOLTAGE

MAX1615

____________Typical Operating Circuit

19-1225; Rev 3; 9/04

PART

MAX1615EUK-T

-40°C to +85°C

TEMP RANGE

PIN-

PACKAGE

5 SOT23-5

_______________Ordering Information

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

SOT

TOP MARK

ABZD

MAX1616EUK-T

ABZE-40°C to +85°C 5 SOT23-5

+Denotes lead-free package.

MAX1615EUK+T ABZD-40°C to +85°C 5 SOT23-5

MAX1616EUK+T ABZE-40°C to +85°C 5 SOT23-5

Summary of content (8 pages)

PAGE 1
9-1225; Rev 3; 9/04 High-Voltage, Low-Power Linear Regulators for Notebook Computers ____________________________Features 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.
PAGE 2
MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to 30V Terminal Voltages to GND SHDN to GND ...........................................-0.3V to (VIN + 0.3V) 5/3 to GND ............................................-0.3V to (VOUT + 0.3V) FB (MAX1616) to GND .........................-0.3V to (VOUT + 0.3V) OUT to GND...........................................................
PAGE 3
High-Voltage, Low-Power Linear Regulators for Notebook Computers (VIN = 15V, SHDN = VIN, ILOAD = 5µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX VIL SHDN Input Threshold Voltage VIH V 1.4 SHDN Input Current V SHDN = 0V or 15V Thermal-Shutdown Temperature UNITS 0.25 TSHDN -1 1 V SHDN = 0V or 15V, hysteresis = +20°C µA 150 °C Note 2: Limits are 100% production tested at TA = +25°C.
PAGE 4
____________________________Typical Operating Characteristics (continued) (VOUT set to 5V, TA = +25°C, unless otherwise noted.) SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE RIPPLE REJECTION vs. FREQUENCY 1.4 MAX1615-05 -70 MAX1615-04 -60 1.2 RIPPLE REJECTION (dB) SHUTDOWN SUPPLY CURRENT (µA) 1.6 1.0 0.8 0.6 0.4 -50 -40 -30 -20 0.2 -10 0 0 ILOAD = 10mA 4 8 12 16 20 24 28 0.01 0.
PAGE 5
High-Voltage, Low-Power Linear Regulators for Notebook Computers PIN NAME FUNCTION MAX1615 MAX1616 1 1 IN 2 2 GND Ground 3 3 OUT Regulator Output 4 — 5/3 Preset Output Voltage Select. Connect to GND for 3.3V output or to OUT for 5.0V output. — 4 FB Feedback Input. Regulates to 1.24V nominally. 5 5 SHDN Positive Input Voltage. Connect to a +4V to +28V supply. Shutdown, active low input. Connect to IN for automatic start up.
PAGE 6
MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers tion is P = IOUT (VIN - VOUT). The power dissipation at +70°C ambient is 571mW (see Absolute Maximum Ratings). The thermal resistance junction-to-case of the SOT23-5 package is 81°C/W, and the maximum safe junction temperature is +150°C. The GND pin performs the dual function of providing an electrical connection to ground and channeling heat away. Connect GND to ground using a large pad or ground plane.
PAGE 7
High-Voltage, Low-Power Linear Regulators for Notebook Computers D P0 W P2 B0 t D1 F P NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. K0 A0 A0 3.200 ±0.102 E 1.753 ±0.102 P0 B0 3.099 ±0.102 F 3.505 ±0.051 P010 D 1.499 +0.102 +0.000 K0 1.397 ±0.102 3.988 ±0.102 0.991 +0.254 +0.000 P D1 3.988 ±0.102 40.005 ±0.203 P2 2.007 ±0.051 t 0.254 ±0.127 W 8.001 +0.305 -0.
PAGE 8
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.) SOT-23 5L .EPS MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers PACKAGE OUTLINE, SOT-23, 5L 21-0057 E 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.