19-3290; Rev 2; 6/06
±±1% ꢀltraꢁ-oꢂ ꢃutput ꢄoltage% Dual and Triple
-inear nꢁFET Controllers
General Description
Features
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.
♦ MAX8563: 3 Outputs
♦ MAX8564/MAX8564A: 2 Outputs
♦ ±±1 ꢀFFedbac ꢁFꢂuꢃbtꢄio
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.
♦ AejustbdꢃF Output ViꢃtbꢂF Diwo ti 0.5V
♦ Cbo UsF CFrbmꢄa Output Cbpbaꢄtirs
♦ WꢄeF Suppꢃy ViꢃtbꢂF ꢁboꢂF PFrmꢄts OpFrbtꢄio
frim 5V ir ±2V ꢁbꢄꢃs
Each controller output is adjustable from 0.5V to 3.3V
♦ Ioeꢄvꢄeubꢃ EobdꢃF Ciotriꢃ boe POK Sꢄꢂobꢃ Aꢃꢃiws
when V
= ±2V and between 0.5V and ±.8V when V
DD
DD
SFquFoaꢄoꢂ
= 5V. Each output is independently enabled and asserts
a POK signal when the output reaches 941 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 801 of the set voltage
for more than 50µs. For a catastrophic short condition, the
regulators are shut down immediately if the output drops
below 601 of the set voltage.
♦ OvFrꢃibe PritFatꢄio Aꢂbꢄost Sift Shirt-Cꢄrauꢄt
Cioeꢄtꢄio
♦ UoeFrviꢃtbꢂF Shirt-Cꢄrauꢄt PritFatꢄio
♦ DrꢄvF o-ChbooFꢃ MOSꢀETs
ꢃrdering Information
PIN-
PACKAGE
PKG
CODE
The MAX8563 is available in a ±6-pin QSOP
package, and the MAX8564/MAX8564A are available
PAꢁT
TEMP ꢁANGE
®
in a ±0-pin µMAX package.
MAX8563EEE
MAX8564EUB
-40°C to +85°C ±6 QSOP
-40°C to +85°C ±0 µMAX
E±6-±
U±0-2
U±0-2
Applications
MAX8564AEUB+ -40°C to +85°C ±0 µMAX
+Denotes lead-free package.
Motherboards
Ultra-Low-Dropout
Voltage Regulators
Low-Voltage DSP, µP, and
Microcontroller Power
Supplies
Dual/Triple Power Supplies
Desknotes and Notebooks
Graphic Cards
Pin Configurations appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical ꢃperating Circuit
5V OR 12V
IN
1.8V 5% IN
C1
1.2V 5% IN
C2
C3
Q1
OUT1
1.5V/1.5A
C5
R2
Q2
DRV1
FB1
V
DD
C4
OUT2
1.05V/3A
R1
R3
C6
R5
R4
DRV2
C7
ON
MAX8563
OFF
EN1
FB2
EN2
ON
POK1
POK1
OFF
3.3V 5% IN
C8
GND
N.C.
POK2
N.C.
POK2
POK3
R6
Q3
C10
R7
OUT3
2.5V/2A*
DRV3
FB3
POK3
EN3
C9
ON
OFF
R8
R9
*2.5V OUTPUT ONLY WITH V = 12V
DD
________________________________________________________________ Maxim Integrated Products
±
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.