19-3290; Rev 2; 6/06
KIT
ATION
EVALU
BLE
AVAILA
±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.
♦
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
Features
MAX8563/MAX8564/MAX8564A
Ordering Information
PART
MAX8563EEE
MAX8564EUB
MAX8564AEUB+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
16 QSOP
10 µMAX
10 µMAX
PKG
CODE
E16-1
U10-2
U10-2
Applications
Motherboards
Dual/Triple Power Supplies
Desknotes and Notebooks
Graphic Cards
Ultra-Low-Dropout
Voltage Regulators
Low-Voltage DSP, µP, and
Microcontroller Power
Supplies
1.8V
±5%
IN
C1
+Denotes
lead-free package.
Pin Configurations appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
5V OR 12V
IN
1.2V
±5%
IN
C2
C3
Q1
OUT1
1.5V/1.5A
C4
R1
FB1
R3
OFF
POK1
3.3V
±5%
IN
C8
GND
N.C.
Q3
C10
OUT3
2.5V/2A*
C9
FB3
R8
R9
*2.5V OUTPUT ONLY WITH V
DD
= 12V
EN3
R7
DRV3
POK3
ON
OFF
POK3
POK2
N.C.
R6
POK2
ON
EN1
POK1
DRV2
R5
C5
R2
DRV1
V
DD
R4
C6
C7
OUT2
1.05V/3A
Q2
MAX8563
FB2
ON
EN2
OFF
________________________________________________________________
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.
±1%, Ultra-Low Output Voltage, Dual and Triple
Linear n-FET Controllers
MAX8563/MAX8564/MAX8564A
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ............................................................-0.3V to +14V
DRV1, DRV2, DRV3, EN1, EN2,
EN3 to GND............................................-0.3V to (V
DD
+ 0.3V)
FB1, FB2, FB3, POK1, POK2, POK3 to GND ...........-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ........444.4mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)........666.7mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= V
EN1
= V
EN2
= V
EN3
= 5V, V
GND
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
GENERAL
V
DD
Voltage Range
V
DD
Undervoltage-Lockout Threshold
V
DD
Quiescent Current
V
DD
Shutdown Current
LDOs
FB_ Accuracy
FB_ Input Bias Current
DRV_ Soft-Start Charging Current
DRV_ Max Sourcing Current
DRV_ Max Sinking Current
DRV_ Max Voltage
FB_ Slow Short-Circuit Threshold
FB_ Fast Short-Circuit Threshold
Slow Short-Circuit Timer
FB_ to DRV_ Transconductance
LOGIC
EN_ Input Low Level
EN_ Input High Level
EN_ Input Leakage Current
V
EN_
= 0 and V
DD
,
V
DD
= 13.2V
T
A
= +25°C
T
A
= +85°C
1.3
-0.1
0.001
+0.1
0.7
V
V
µA
0.115
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= +85°C
MAX8563, MAX8564
MAX8564A
V
FB_
= 0.45V
V
FB_
= 0.6V
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
4
3
3
1.8
4.7
8.0
400
300
50
0.24
0.460
10.9
7
7
0.494
0.489
-100
-8
100
10
0.5
0.504
0.509
+100
V
nA
µA
mA
mA
V
mV
mV
µs
Mho
Rising, 200mV hysteresis (typ)
V
EN_
= V
DD
= 12V (MAX8563)
V
EN_
= V
DD
= 12V (MAX8564/MAX8564A)
EN1 = EN2 = EN3 = GND, V
DD
= 12V
4.5
3.56
3.76
930
660
13.2
4.00
1600
1200
25
V
V
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
= 5V, V
FB_
= 0.46V
V
DD
= 13.2V, V
FB_
= 0.46V
Measured at FB_ (falling)
Measured at FB_ (falling)
2
_______________________________________________________________________________________
±1%, Ultra-Low Output Voltage, Dual and Triple
Linear n-FET Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
EN1
= V
EN2
= V
EN3
= 5V, V
GND
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
POK_ Threshold Falling
POK_ Threshold Rising at Startup
POK_ Output Low Level
POK_ Output High Leakage
CONDITIONS
Measured at FB_ (falling)
Measured at FB_ (rising)
Sinking 1mA, V
DD
= 4.5V, V
FB_
= 0.4V
V
DD
= 5.5V
T
A
= +25°C
T
A
= +85°C
0.001
MIN
425
455
TYP
440
470
MAX
455
485
0.1
0.1
UNITS
mV
mV
V
µA
MAX8563/MAX8564/MAX8564A
Note 1:
Specifications are production tested at T
A
= +25°C. Maximum and minimum specifications over temperature are guaranteed by
design.
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8563 toc01
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8563 toc02
OUTPUT VOLTAGE vs. OUTPUT CURRENT
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0
V
OUT3
V
DD
= 12V
MAX8563 toc03
1.6
V
DD
= 5V
1.5
OUTPUT VOLTAGE (V)
1.4
1.3
1.2
1.1
1.0
V
OUT1
2.6
V
DD
= 12V
2.4
OUTPUT VOLTAGE (V)
2.2
2.0
1.8
1.6
1.4
V
OUT1
V
OUT3
OUTPUT VOLTAGE (V)
V
OUT1
V
OUT2
1.2
1.0
1.0
V
OUT2
1.4
1.8
2.2
2.6
3.0
3.4
V
OUT2
0.5
1.0
1.5
2.0
2.5
3.0
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
FEEDBACK VOLTAGE
vs. TEMPERATURE
MAX8563 toc04
PSRR vs. FREQUENCY
90
80
70
PSRR (dB)
60
50
40
30
20
V
DRV2
100
1k
10k
100k
V
IN2
V
OUT1
= 1.5V
V
IN1
= 2V
LOAD = 1.25Ω
V
DD
= 12V
MAX8563 toc05
LOAD TRANSIENT
MAX8563 toc06
0.5000
V
DD
= 5V
0.4998
FEEDBACK VOLTAGE (V)
0.4996
0.4994
0.4992
0.4990
0.4988
0.4986
-40
-15
10
35
60
V
DD
= 12V
100
I
OUT2
2A/div
0
V
OUT2
20mV/div
AC-COUPLED
200mV/div
AC-COUPLED
10
0
85
TEMPERATURE (°C)
FREQUENCY (Hz)
V
DD
= 12V
FIGURE 1, C7 = 100μF 6TPE100MI
10μs/div
2V/div
0
_______________________________________________________________________________________
3
±1%, Ultra-Low Output Voltage, Dual and Triple
Linear n-FET Controllers
MAX8563/MAX8564/MAX8564A
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C.)
POWER-ON SEQUENCING WITH V
DD
MAX8563 toc07
POWER-ON SEQUENCING WITH V
IN
MAX8563 toc08
V
DD
20V/div
0
2V/div
0
V
DD
ENABLE CONFIGURED AS
SHOWN IN FIGURE 4
RD = 100kΩ, RE = 4kΩ
20V/div
0
2V/div
0
V
OUT1
V
IN1
V
IN1
2V/div
0
V
OUT1
2V/div
0
2V/div
0
V
POK1
2V/div
V
POK1
0
20ms/div
10ms/div
ENABLE-ON SEQUENCING
MAX8563 toc09
SHORT-CIRCUIT PROTECTION
MAX8563 toc10
V
IN1
2V/div
0
2V/div
I
OUT1
5A/div
0
V
OUT1
1V/div
0
EN1
0
V
OUT1
2V/div
0
2V/div
V
POK1
0
V
DRV1
2V/div
0
20μs/div
20ms/div
4
_______________________________________________________________________________________
±1%, Ultra-Low Output Voltage, Dual and Triple
Linear n-FET Controllers
Functional Diagram
V
DD
VL
0.5V
REF
GND
MAX8563
MAX8564
MAX8564A
V
DD
V
DD
EN1
VL
POK1
0.5V
GM
DRV1
UVLO
MAX8563/MAX8564/MAX8564A
POK
COMPARATOR
LDO
CONTROLLER 1
FB1
EN2
POK2
LDO
CONTROLLER 2
DRV2
FB2
EN3
POK3
LDO
CONTROLLER 3
DRV3
FB3
Pin Description
NAME
PIN
MAX8563
MAX8564/
MAX8564A
FUNCTION
1
DRV1
DRV1
Output n-MOSFET Drive. Drives the gate of an external n-channel MOSFET to regulate output 1.
DRV1 is internally pulled to ground when EN1 is logic low. Connect an external series RC circuit
for compensation. See the
Stability Compensation
section.
Feedback Input for Output 1. Connect to the center of a resistor-divider between output 1 and GND to
set the output voltage of output 1. The feedback regulation voltage is 0.500V. See the
Output Voltage
Setting
section.
Enable Control for Output 1. Drive logic high to enable output 1, or logic low to disable the
output. Connect to V
DD
for always-on operation.
Output 1 Power-Good Signal. Open-drain output pulls low when output 1 is 12% below the
nominal regulated voltage.
Ground
Output 2 Power-Good Signal. Open-drain output pulls low when output 2 is 12% below the
nominal regulated voltage.
No Internal Connection
2
FB1
FB1
3
4
5
EN1
POK1
GND
—
EN1
POK1
GND
POK2
—
6
N.C.
_______________________________________________________________________________________
5
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