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PDF MAX1615EUK-T Data sheet ( Hoja de datos )
| Número de pieza | MAX1615EUK-T | |
| Descripción | High-Voltage / Low-Power Linear Regulators for Notebook Computers | |
| Fabricantes | Maxim Integrated | |
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19-1225; Rev 2; 1/98
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
________________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.
________________________Applications
CMOS/RTC Backup Power
Microcontroller Power
Notebook Computers
Smart-Battery Packs
PDAs and Handy-Terminals
Battery-Powered Systems
____________Typical Operating Circuit
____________________________Features
o 4V to 28V Input Range
o 8µA (max) Quiescent Supply Current
o <1µA Shutdown Supply Current
o 3.3V or 5V, Pin-Selectable Output (MAX1615)
Adjustable 1.24V to 28V Output (MAX1616)
o 30mA Output Current
o ±2% Initial Output Accuracy
o Thermal-Overload Protection
o 5-Pin SOT23 Package
o Low Cost
_______________Ordering Information
PART
TEMP. RANGE
MAX1615EUK-T -40°C to +85°C
MAX1616EUK-T -40°C to +85°C
PIN-
SOT
PACKAGE TOP MARK
5 SOT23-5 ABZD
5 SOT23-5 ABZE
___________________Pin Configuration
BATTERY
CIN
0.1µF
IN OUT
MAX1615
SHDN
GND
5/3
OUTPUT
VOLTAGE
COUT
4.7µF
TOP VIEW
IN 1
5 SHDN
MAX1615
GND 2 MAX1616
OUT 3
4 5/3 (FB)
SOT23-5
( ) ARE FOR MAX1616.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 408-737-7600 ext. 3468.
1 page  
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
______________________________________________________________Pin Description
PIN
MAX1615
MAX1616
11
22
33
4—
—4
55
NAME
IN
GND
OUT
5/3
FB
SHDN
FUNCTION
Positive Input Voltage. Connect to a +4V to +28V supply.
Ground
Regulator Output
Preset Output Voltage Select. Connect to GND for 3.3V output or to OUT
for 5.0V output.
Feedback Input. Regulates to 1.24V nominally.
Shutdown, active low input. Connect to IN for automatic start up.
IN
VREF
SHDN
MAX1615
MAX1616
CURRENT
LIMIT
OUT
FB
(MAX1616)
5/3
(MAX1615)
GND
Figure 1. Functional Diagram
_______________Detailed Description
The MAX1615/MAX1616 low-quiescent-current linear
regulators are designed primarily for high input voltage
applications. The MAX1615 supplies a preselected 3.3V
or 5.0V output for loads up to 30mA. The MAX1616
provides an adjustable voltage from 1.24V to 28V. The
maximum output current is a function of the package’s
maximum power dissipation for a given temperature. A
5µA load is required to maintain output regulation.
The MAX1615’s output voltage is fed back through an
internal resistor voltage divider connected to OUT. Set
the output voltage to either 3.3V or 5.0V with the 5/3 pin.
Select the 5V output by connecting 5/3 to OUT, or the
3.3V output by connecting 5/3 to GND.
The MAX1616 uses external feedback, allowing the out-
put voltage to be set by external resistors (see Setting
the MAX1616 Output Voltage section). The typical FB
threshold is at 1.24V.
Shutdown
The device enters shutdown mode when SHDN is low.
In shutdown mode, the pass transistor, control circuit,
reference, and all biases turn off, reducing the supply
current to below 1µA. Connect SHDN to IN for automatic
start-up.
Current Limit
Output current is limited to 100mA (typical). The current
limit exceeds the 30mA (max) safe operating limit. The
output can be shorted to ground for 30 seconds without
damaging the part.
Thermal-Overload Protection
When the junction temperature exceeds TJ = +150°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
+20°C (typical), resulting in a pulsating output during
continuous thermal-overload conditions.
Operating Region and Power Dissipation
Maximum power dissipation depends on the thermal
resistance of the case and circuit board, the tempera-
ture difference between the die junction and ambient
air, and the rate of air flow. The device’s power dissipa-
_______________________________________________________________________________________ 5
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