MAX8563 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 1%, Ultra-Low Output Voltage, Dual and Triple Linear n-FET Controllers

19-3290; Rev 2; 6/06
EVAALVUAAILTAIOBNLEKIT
±1%, Ultra-Low Output Voltage, Dual and Triple
Linear n-FET Controllers
General Description
The MAX8563/MAX8564/MAX8564A ultra-low-output dual
and triple LDO controllers allow flexible and inexpensive
point-of-load voltage conversion in motherboards,
desknotes, notebooks, and other applications.
These parts feature a 0.5V reference voltage with ±1%
accuracy providing tight regulation of the output volt-
age. The MAX8563 has three n-channel MOSFET con-
troller outputs, and the MAX8564/MAX8564A has two
controller outputs.
Each controller output is adjustable from 0.5V to 3.3V
when V_DD = 12V and between 0.5V and 1.8V when V_DD
= 5V. Each output is independently enabled and asserts
a POK signal when the output reaches 94% of the set
value. Each output is protected against a soft short-circuit
condition by an undervoltage comparator that disables
the output when it drops to under 80% of the set voltage
for more than 50µs. For a catastrophic short condition, the
regulators are shut down immediately if the output drops
below 60% of the set voltage.
The MAX8563 is available in a 16-pin QSOP
package, and the MAX8564/MAX8564A are available
in a 10-pin µMAX^® package.
Applications
Motherboards
Dual/Triple Power Supplies
Desknotes and Notebooks
Graphic Cards
Ultra-Low-Dropout
Voltage Regulators
Low-Voltage DSP, µP, and
Microcontroller Power
Supplies
Features
♦ MAX8563: 3 Outputs
♦ MAX8564/MAX8564A: 2 Outputs
♦ ±1% Feedback Regulation
♦ Adjustable Output Voltage Down to 0.5V
♦ Can Use Ceramic Output Capacitors
♦ Wide Supply Voltage Range Permits Operation
from 5V or 12V Rails
♦ Individual Enable Control and POK Signal Allows
Sequencing
♦ Overload Protection Against Soft Short-Circuit
Condition
♦ Undervoltage Short-Circuit Protection
♦ Drive n-Channel MOSFETs
Ordering Information
PART
TEMP RANGE
MAX8563EEE
-40°C to +85°C
MAX8564EUB
-40°C to +85°C
MAX8564AEUB+ -40°C to +85°C
+Denotes lead-free package.
PIN-
PACKAGE
16 QSOP
10 µMAX
10 µMAX
PKG
CODE
E16-1
U10-2
U10-2
Pin Configurations appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
1.8V ±5% IN
C1
OUT1
1.5V/1.5A
C4
Q1
R1
C5
R2
POK1
3.3V ±5% IN
R3
ON
OFF
C8
Q3
OUT3
2.5V/2A*
C9
C10
R7
R8
R9
*2.5V OUTPUT ONLY WITH VDD = 12V
5V OR 12VIN
C2
1.2V ±5% IN
C3
DRV1
VDD
FB1
DRV2
EN1 MAX8563 FB2
POK1
EN2
GND
POK2
N.C.
N.C.
DRV3
FB3
POK3
EN3
R4
C6
R5
ON
OFF
R6
ON
OFF
Q2
OUT2
1.05V/3A
C7
POK2
POK3
________________________________________________________________ Maxim Integrated Products 1
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.