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MAX6651EEE

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
General Description
The MAX6650/MAX6651 fan controllers use an
SMBus/I
2
C-compatible interface to regulate and moni-
tor the speed of 5VDC/12VDC brushless fans with built-
in tachometers. They automatically force the fan’s
tachometer frequency (fan speed) to match a prepro-
grammed value in the Fan-Speed Register by using an
external MOSFET or bipolar transistor to linearly regu-
late the voltage across the fan. The MAX6650 regulates
the speed of a single fan by monitoring its tachometer
output. The MAX6651 also regulates the speed of a sin-
gle fan, but it contains additional tachometer inputs to
monitor up to four fans and control them as a single unit
when they are used in parallel.
The MAX6650/MAX6651 provide general-purpose
input/output (GPIO) pins that serve as digital inputs,
digital outputs, or various hardware interfaces. Capable
of sinking 10mA, these open-drain inputs/outputs can
drive an LED. To add additional hardware control, con-
figure GPIO1 to fully turn on the fan in case of software
failure. To generate an interrupt when a fault condition
is detected, configure GPIO0 to behave as an active-
low alert output. Synchronize multiple devices by set-
ting GPIO2 (MAX6651 only) as an internal clock output
or an external clock input.
The MAX6650 is available in a space-saving 10-pin
µMAX
®
package, and the MAX6651 is available in a
small 16-pin QSOP package.
________________________Applications
RAID Desktop Computers
Servers Networking
Workstations Telecommunications
____________________________Features
♦ Closed/Open-Loop Fan-Speed Control for
5V/12V Fans
♦ 2-Wire SMBus/I
2
C-Compatible Interface
♦ Monitors Tachometer Output
Single Tachometer (MAX6650)
Up to Four Tachometers (MAX6651)
♦ Programmable Alert Output
♦ GPIOs
♦ Hardware Full-On Override
♦ Synchronize Multiple Fans
♦ Four Selectable Slave Addresses
♦ 3V to 5.5V Supply Voltage
♦ Small Packages
10-Pin µMAX (MAX6650)
16-Pin QSOP (MAX6651)
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
MAX6650/MAX6651
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
EVALUATION KIT AVAILABLE
19-1784; Rev 5; 12/12
Ordering Information
µMAX is a registered trademark of Maxim Integrated Products, Inc.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX6650
V
CC
SCL
10kΩ
SDA
GPIO0 OUT
ADD
GND
FB
TACH0
V
CC
3V TO 5.5V
V
FAN
5V OR 12V
C
COMP
10μF
SMBus/I
2
C
INTERFACE
GPIO1
LED
FAN
FULL ON
ALERT
Typical Operating Circuit
Pin Configurations appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX6650EUB -40°C to +85°C 10 µMAX
MAX6650EUB+ -40°C to +85°C 10 µMAX
MAX6651EEE -40°C to +85°C 16 QSOP
MAX6651EEE+ -40°C to +85°C 16 QSOP
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
2 Maxim Integrated
MAX6650/MAX6651
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
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.
V
CC
to GND..............................................................-0.3V to +6V
FB, TACH_ ..........................................................-0.3V to +13.2V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
Output Voltages..........................................-0.3V to (V
CC
+ 0.3V)
Maximum Current
Into V
CC
, GND, V
OUT
...................................................100mA
Into All Other Pins ..........................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
µMAX (derate 5.6mW/°C above +70°C) .....................444mW
QSOP (derate 8.3mW/°C above +70°C).....................667mW
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
Soldering Temperature (reflow)
Lead(Pb)-free..............................................................+260°C
Containing lead(Pb) ....................................................+240°C
Input Low Voltage
Input Hysteresis V
HYS
200 mV
Tachometer Threshold V
TACH_
V
FB
+ 1.0 V
FB
+3
V
12V fan, 0 < V
FB
< 9V
PARAMETER SYMBOL MIN TYP MAX UNITS
Output Source Current I
SOURCE
50 mA
Output Sink Current I
SINK
10 mA
Output Voltage Range V
OUT
0.3 V
CC
- 0.3 V
V
FB
+ 0.5 V
FB
+1.5
Tachometer Input Impedance R
TACH_
70 100 150 kΩ
Supply Voltage V
CC
3.0 5.5 V
Supply Current I
CC
10 mA
DAC Differential Nonlinearity 5 LSB
Useful DAC Resolution 8 bits
Feedback Input Impedance R
FB
70 100 150 kΩ
Output Sink Current I
GPIO_
10 mA
CONDITIONS
Guaranteed monotonicity on FB (Note 1)
V
OUT
= V
CC
- 1.8V
Measured at FB (Note 1)
V
OUT
= 0.5V
I
OUT
= ±100µA
5V fan, 0 < V
FB
< 4.5V
0 < VFB < 9V
0 < V
TACH
< 9V
V
GPIO_
= 0.4V
Full-on mode, I
OUT
= 0
V
0.8V
IL(GPIO_)
Input High Voltage
V
2V
CC
≤ 3.6V
V
IH(GPIO_)
3V
CC
> 3.6V
Pullup Resistor R
GPIO_
100 kΩ
TACHOMETER INPUTS (TACH_)
FEEDBACK (FB)
GENERAL-PURPOSE INPUTS/OUTPUTS (GPIO_) (Note 2)
POWER SUPPLY (V
CC
)
OUTPUT (OUT)
kΩ9.5 10.5Selects slave address 3Eh (Table 1)R
ADD
ADD External Pulldown Resistor
to GND
Selects slave address 36h (Table 1) (Note 3) µA-1 0I
LADD
ADD Input Leakage
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
TIMING CHARACTERISTICS
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
Maxim Integrated 3
MAX6650/MAX6651
Selects slave address 96h (Table 1)
Selects slave address 90h (Table 1)
CONDITIONS
VV
CC
- 0.05V
IH(ADD)
ADD Input High Voltage
V0.1V
IL(ADD)
ADD Input Low Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
ADDRESS SELECT (ADD)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
µs500Minimum pulse durationGlitch Rejection
kHz254f
CLK
Clock Frequency
kHz0 400f
SCL
SCL Clock Frequency
µs1.3t
BUF
Bus Free Time Between Stop
and Start Condition
Hold-Time Start Condition t
HD:STA
0.6 µs
µs1.3t
LOW
Low Period of the SCL Clock
High Period of the SCL Clock t
HIGH
0.6 µs
µs0 900(Note 5)t
HD:DAT
Data Hold Time
Data Setup Time t
SU:DAT
100 ns
ns20 + 0.1C
B
(pF) 300(Note 6)t
R
Rise-Time SDA/SCL Signal
(Receiving)
Fall-Time SDA/SCL Signal
(Receiving)
t
F
(Note 6) 20 + 0.1C
B
(pF) 300 ns
ns20 + 0.1C
B
(pF) 250I
SINK
< 6mA (Note 6) t
F
Fall-Time SDA Signal
(Transmitting)
%-10 +10V
CC
= 5Vf
CLK
Clock Frequency Uncertainty
TACHOMETERS
GPIO2 (Note 2)
SMBus/I
2
C INTERFACE (Figures 3, 4)
V
ADD
= 0.5V (Note 4)
SMBus/I
2
C INTERFACE (SDA, SCL)
µA-80 -40I
ADD
ADD Pulldown Current
V
SDA
= 0.6V mA6I
SDA
Data Output Sink Current
V
CC
≤ 3.6V
V
2
V0.8V
IL
Input Low Voltage
0 < V
IN
< V
CC
µA±1Input Leakage Current
V
CC
> 3.6V 3
V
IH
Input High Voltage
mV200V
HYS
Input Hysteresis
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX6651EEE

Mfr. #:
Buy MAX6651EEE
Manufacturer:
Maxim Integrated
Description:
Motor / Motion / Ignition Controllers & Drivers
Lifecycle:
New from this manufacturer.
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