Maxim MAX5914EMH 48v quad hot-swap controllers for power-over-lan Datasheet

19-2244; Rev 2; 11/02
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
TEMP RANGE
PIN-PACKAGE
MAX5913EMH
PART
-40°C to +85°C
44 MQFP
MAX5914EMH
-40°C to +85°C
44 MQFP
34
ON1
RLYON1
DC
36
35
ON2
RLYON2
37
38
39
RLYON4
ON3
RLYON3
40
41
33
2
32
3
31
4
30
5
29
MAX5913
MAX5914
6
7
28
27
23
RTRYEN
STATOUT
OCEN
DGND
VCC
CSP1
DRAIN1
GATE1
OUT1
CSP2
DRAIN2
AGND
OUT2
GATE2
22
24
11
21
25
10
20
26
9
19
8
OUT3
GATE3
Typical Operating Circiut appears at end of data sheet.
42
1
18
FAULT
STAT1
STAT2
STAT3
STAT4
CSP4
DRAIN4
OUT4
GATE4
CSP3
DRAIN3
43
TOP VIEW
VDD
RTIM
ON4
Pin Configuration
12
Mid-Span Power-Over-MDI
Ordering Information
17
Network Switches/Routers
♦ On-Chip +12V, 100mA Voltage Relay Drivers
DGND
RLYD1
RLYD2
Telecom Line Cards
♦ +32V Input Undervoltage Lockout
16
IP Phone Switches/Routers
♦ Foldback Current Limiting
15
Power-Over-MDI
♦ On-Board Charge Pumps to Drive External
N-Channel FETs
♦ Current Sense with External Resistor
14
Power-Over-LAN
♦ Open-Circuit Detector
VRLY
RLYD3
RLYD4
Applications
♦ Four Independent Power Switch Controllers
44
The MAX5913/MAX5914 are available in a 44-pin MQFP
package and are specified for the extended -40°C to
+85°C operating temperature range.
♦ Wide Operating Input Voltage Range
+35V to +72V
♦ IEEE 802.3AF Compatible
13
The MAX5913/MAX5914 feature an internal undervoltage lockout (UVLO) function that prevents the FET from
turning on, if VCC does not exceed the default value of
+32V. The devices also feature a +12V relay driver with
100mA current drive capable of driving low-voltage
+3.3V relays. The MAX5913 features an active-low relay
driver that sinks current when the relay output is
enabled. The MAX5914 features an active-high relay
driver output that sources 1mA to drive an external FET
relay driver when the relay output is enabled. Control
circuitry ensures the relays and the FETs are off until
V CC reaches the UVLO threshold. The MAX5913/
MAX5914 use an external sense resistor to enable all
the internal current-sense functions.
The MAX5913/MAX5914 feature a programmable analog current-limit circuit. If the switch remains in current
limit for more than a programmable time, the N-channel
FET latches off and the supply can be restarted either
by autoretry or by an external command after the preset
off-time has elapsed.
Features
MQFP
________________________________________________________________ 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.
1
MAX5913/MAX5914
General Description
The MAX5913/MAX5914 are quadruple hot-swap controllers. The MAX5913/MAX5914 independently control
four external N-channel switches to hot-swap system
loads from a single VCC supply line. The devices allow
the safe insertion and removal of power devices from
live network ports. Operating supply voltage range is
between +35V and +72V. The devices are intended for
applications in Power-Over-Media-Dependent Interface
(MDI), but are not limited to such usage.
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
ABSOLUTE MAXIMUM RATINGS
VCC to AGND or DGND..........................................-0.6V to +76V
DRAIN_, OUT_ to AGND or DGND................-0.6V to VCC +0.3V
CSP_ to VCC ..........................................................-0.3V to +0.3V
GATE_ to OUT_ .....................................................-0.3V to +13V
VRLY to DGND ........................................................-0.3V to +18V
RLYD_ to DGND........................................-0.3V to (VRLY + 0.3V)
ON_, RLYON_, OCEN, RTRYEN, STATOUT,
DC to DGND........................................................-0.3V to +12V
FAULT to DGND .....................................................-0.3V to +12V
STAT_, RTIM to DGND ...............................-0.3V to (VDD + 0.3V)
VDD to DGND ...........................................................-0.3V to +7V
DGND to AGND...........................................................-5V to +5V
Current into RLYD_ .........................................-50mA to +150mA
Current into Any Other Pin................................................±50mA
Continuous Power Dissipation (TA = +70°C)
44-Pin MQFP (derate 12.7mW/°C above +70°C)......... 1.013W
Operating Temperature Range ...........................-40°C to +85°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
(VCC = VCSP_ = +48V, AGND = DGND = 0, VDD = +3.3V, VRLY = +12V, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at VCC = VCSP_ = +48V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
72
V
POWER SUPPLIES
Analog Supply Voltage
VCC
Measured with respect to AGND
VCC = VCSP_ = 72V
IS = ICC + ICSP
Analog Supply Current
IS
Digital Supply Voltage
VDD
Measured with respect to DGND
Digital Supply Current
IDD
All logic outputs high, RTIM floating
Analog Supply Undervoltage
Lockout
VUVLO
UVLO Hysteresis
VUVLO,H
UVLO Deglitch Delay
tD,UVLO
35
0°C to +85°C
2.7
-40°C to 0°C
VCC rising, circuits enabled
4
5
1.8
3.3
3.7
V
1.1
3
mA
29
32
35
V
12.8
25.6
38.4
ms
14
V
4
V
2
µA
3
VON = 3.3V, VRLYON = 3.3V (Figure 1)
Relay Driver Supply
VRLY
Measured with respect to DGND
Ground Potential Difference
VGG
Voltage difference between DGND and AGND
mA
-4
V
FEEDBACK INPUT AND CURRENT SENSE
OUT Sense Bias Current
IFP
Initial Feedback Voltage
VFB_S
Voltage under which the foldback circuit starts
reducing the current-limit value
(Note 1)
VSC
Maximum ∆V across RSENSE at VOUT > VFB_S
125
142.5
160
mV
Maximum ∆V across RSENSE at VOUT = 0
42
48
54
mV
360
420
480
mV
1.2
1.5
1.8
V
Current-Limit Threshold Voltage
Foldback Voltage
Fast Discharge Threshold
Switch-On Threshold
Switch-On Comparator Hysteresis
VFLBK
VOUT_ = VCC
VFC
VSWON
Maximum VCC - VOUT at which the switch is
defined as fully on, VOUT increasing
18
VSWON_H
V
160
mV
MOSFET DRIVERS
Gate Overdrive Voltage
Gate Charge Current
2
VGS
IGATE
VGATE - VCC when switch is fully on
0°C to +85°C
7
9
11
-40°C to 0°C
7
9
12
VGATE = 0
7
10
13
_______________________________________________________________________________________
V
µA
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
(VCC = VCSP_ = +48V, AGND = DGND = 0, VDD = +3.3V, VRLY = +12V, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at VCC = VCSP_ = +48V and TA = +25°C.) (Note 3)
PARAMETER
Gate Discharge Current
Source-Gate Clamp Voltage
SYMBOL
IGATE,DIS
CONDITIONS
MIN
TYP
MAX
UNITS
During current regulation
8
µA
VON = 0
1
mA
(VCSP_ - VDRAIN_) > VFC
15
mA
VSGZ
VOUT_ = 0, force 30mA into GATE_, measure
VGATE - VOUT
14
16.5
18
V
VOC
Minimum ∆V across RSENSE to detect an
open circuit
1.5
3
4.5
mV
tOC
(Figure 2)
450
900
1350
ms
(VCSP_ - VDRAIN__) < VOC (Figure 2)
106
204
302
ms
0.5
V
0.3
0.8
1.3
mA
2
V
OPEN-CIRCUIT DETECTOR
Open-Circuit Current-Threshold
Voltage
Delay to Open-Circuit Detect
Deglitch Delay
tLPFD
RELAY DRIVERS
Maximum Low Voltage (MAX5913)
VRLOW
RLYON = high, IRLYD_ = 100mA
Relay Pullup Current (MAX5914)
IRPLUP
RLYON = high, VRLYD_ = 0
Clamp Diode Voltage
VRCLAMP
Relay Output Leakage
Force 100mA into RLYD, measure VRLYD VRLY
RLYON_ = low, VRLYD_ = VRLY
1
µA
TIMING
Short-Circuit and Startup Timer
(Note 2)
tO
RRTIM = 2kΩ
On time for continuous
RRTIM = 40kΩ
overcurrent conditions
RRTIM = ∞
4.8
6.4
8.0
76
128
180
3.2
6.4
9.6
DC = logic low
Auto-Retry Duty Cycle
ms
1
DC = logic high
2
DC = floating
4
%
Port Turn-ON Delay
tON_DEL
VON = 3.3V (Figure 3)
12.8
25.6
38.4
ms
Relay Turn-OFF Delay
tOFF_DEL
After RLYON_ goes low (Figure 3)
1.6
3.2
4.8
ms
DIGITAL INTERFACE
VIH_DC
+1.8V ≤ VDD ≤ +3.7V
DC Pin Input Voltage Low
VIL_DC
+1.8V ≤ VDD ≤ +3.7V
DC Pin Input Impedance
RIN_DC
DC Pin Input Voltage High
0.7 x VDD
0.3 x VDD
1
Logic Input High
VIH
+1.8V ≤ VDD ≤ +3.7V
Logic Input Low
VIL
+1.8V ≤ VDD ≤ +3.7V
VFL
ISINK = 4mA
Logic Output Voltage High
VOH
STAT_ outputs sourcing 0.5mA
Logic Output Voltage Low
VOL
STAT_ outputs sinking 0.5mA
V
0.3 x VDD
FAULT High Input Leakage
V
kΩ
0.8 x VDD
Logic Input Leakage
FAULT Output Voltage Low
V
V
1
µA
0.4
V
1
VDD - 0.4
µA
mV
0.4
V
Note 1: See Typical Operating Characteristics for Current-Limit Foldback, and refer to Current Sensing and Regulation section.
Note 2: The resistor at RTIM can range from 2kΩ to 40kΩ.
Note 3: Limits are 100% tested at TA = +25°C and TA = +85°C. Limits at -40°C are guaranteed by design and characterization, but
are not production tested.
_______________________________________________________________________________________
3
MAX5913/MAX5914
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, AGND = DGND = 0, RTIM = open, TA = +25°C, unless otherwise specified.)
3.2
3.0
2.8
2.6
2.4
3.1
VCC = +48V
3.0
VCC = +57V
2.9
VCC FALLING
29
28
VCC = +36V
27
2.5
-40
-15
10
35
60
85
-40
-15
10
35
60
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
GATE OVERDRIVE VOLTAGE
vs. INPUT VOLTAGE
GATE OVERDRIVE VOLTAGE
vs. TEMPERATURE
STARTUP WAVEFORMS
TA = -40°C
9.00
VCC = +72V
VCC = +57V
GATE OVERDRIVE (V)
TA = +25°C
85
MAX5913/4 toc06
9.5
MAX5913/4 toc04
9.50
8.75
30
2.8
33 36 39 42 45 48 51 54 57 60 63 66 69 72
9.25
MAX5913/4 toc02
VCC RISING
2.6
2.0
31
3.2
2.7
TA = -40°C
2.2
32
UVLO (V)
TA = +25°C
VCC = +72V
3.3
MAX5913/4 toc05
SUPPLY CURRENT (mA)
TA = +85°C
3.4
SUPPLY CURRENT (mA)
3.8
3.4
3.5
MAX5913/4 toc01
4.0
3.6
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
MAX5913/4 toc03
SUPPLY CURRENT
vs. INPUT VOLTAGE
GATE OVERDRIVE (V)
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
A
0
0
B
0
C
0
D
9.0
VCC = +48V
VCC = +36V
8.5
TA = +85°C
8.0
8.50
33 36 39 42 45 48 51 54 57 60 63 66 69 72
-40
-15
10
35
60
85
4ms/div
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TURN-OFF WAVEFORMS
A: VON = VRLYON, 5V/div
B: VRLYD, 20V/div
C: VOUT, 20V/div
D: VGATE, 20V/div
GATE TURN-OFF WAVEFORM
MAX5913/4 toc07
UVLO TURN-ON DELAY
MAX5913/4 toc08
MAX5913/4 toc09
A
A
B
0
A
0
0
0
B
B
0
C
0
0
C
0
D
D
0
4ms/div
A: VON = VRLYON, 5V/div
B: VRLYD, 20V/div
C: VOUT, 20V/div
D: VGATE, 20V/div
4
0
C
0
D
0
10ms/div
A: VRLYD, 20V/div
B: VRLYON, 5V/div
C: VON, 5V/div
D: VGATE, 20V/div
4ms/div
RLYON = VDD
A: VON, 5V/div
B: VCC, 10V/div
C: VOUT, 50V/div
D: VGATE, 50V/div
_______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
MAX5913/4 toc12
MAX5913/4 toc11
MAX5913/4 toc10
A
A
0
0
TURN-ON INTO CAPACITIVE LOAD
(CL = 470µF)
TURN-ON INTO CAPACITIVE LOAD
(CL = 47µF)
TURN-ON INTO CAPACITIVE LOAD
(CL = 0.47µF)
B
B
C
C
A
0
C
0
0
0
0
0
0
D
0
D
0
10ms/div
RLYON = VDD, RRTIM = 40kΩ
A: VON, 5V/div
B: VGATE, 20V/div
C: VOUT, 20V/div
D: IOUT, 200mA/div
RLYON = VDD, RRTIM = 2kΩ
A: VON, 5V/div
B: VGATE, 20V/div
C: VOUT, 20V/div
D: IOUT, 200mA/div
CURRENT-LIMIT FOLDBACK
(VCC = +48V)
CURRENT-LIMIT FOLDBACK
(VCC = +36V)
0
CURRENT-LIMIT FOLDBACK
(VCC = +57V)
MAX5913/4 toc14
MAX5913/4 toc13
A
B
0
C
0
D
0
1ms/div
400µs/div
RLYON = VDD
A: VON, 5V/div
B: VGATE, 20V/div
C: VOUT, 20V/div
D: IOUT, 100mA/div
B
MAX5913/4 toc15
A
B
A
0
B
0
C
C
0
0
0
0
10ms/div
RLYON = VDD, RL = 100Ω, RRTIM = 40kΩ, CLOAD = 470µF
A: VON, 5V/div
B: VOUT, 10V/div
C: IOUT, 200mA/div
10ms/div
RLYON = VDD, RL = 139Ω, RRTIM = 40kΩ, CLOAD = 470µF
A: VON, 5V/div
B: VOUT, 10V/div
C: IOUT, 200mA/div
10ms/div
RLYON = VDD, RL = 162Ω, RRTIM = 40kΩ, CLOAD = 470µF
A: VON, 5V/div
B: VOUT, 10V/div
C: IOUT, 200mA/div
_______________________________________________________________________________________
5
MAX5913/MAX5914
Typical Operating Characteristics (continued)
(VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, AGND = DGND = 0, RTIM = open, TA = +25°C, unless otherwise specified.)
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
Typical Operating Characteristics (continued)
(VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, AGND = DGND = 0, RTIM = open, TA = +25°C, unless otherwise specified.)
CURRENT-LIMIT FOLDBACK
(VCC = +72V)
CURRENT-LIMIT FOLDBACK
(VCC = +57V)
MAX5913/4 toc16
MAX5913/4 toc17
A
0
B
0
CURRENT-LIMIT FOLDBACK
(VCC = +72V)
MAX5913/4 toc18
A
B
A
0
B
0
0
C
0
0
0
10ms/div
C
RLYON = VDD, RL = 200Ω, RRTIM = 40kΩ
A: VON, 5V/div
B: VOUT, 10V/div
C: IOUT, 200mA/div
20ms/div
RLYON = VDD, RL = OPEN,
RRTIM = 40kΩ, CLOAD = 470µF
A: VON, 5V/div
B: VOUT, 10V/div
C. IOUT, 200mA/div
RLYON = VDD, RL = OPEN, RRTIM = 40kΩ, CLOAD = 470µF
A: VON, 5V/div
B: VOUT, 20V/div
C: IOUT, 200mA/div
SHORT-CIRCUIT RESPONSE
(VCC = +48V)
OVERCURRENT DELAY
(EXPANDED TIME SCALE)
OVERCURRENT DELAY
MAX5913/4 toc19
C
0
10ms/div
MAX5913/4 toc21
MAX5913/4 toc20
A
A
A
0
0
0
B
B
0
B
0
20ms/div
RTRYEN = VDD, RLYON = ON = VDD, DC = 4%,
RRTIM = 2kΩ, RL = 100Ω
A: VGATE, 20V/div
B: IOUT, 200mA/div
6
1ms/div
RTRYEN = VDD, RLYON = ON = VDD,
DC = DON'T CARE, RRTIM = 2kΩ, RL = 100Ω
A: VGATE, 20V/div
B: IOUT, 200mA/div
0
1ms/div
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 200mA/div
B: VGATE, 20V/div
_______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
SHORT-CIRCUIT RESPONSE
(VCC = +48V EXPANDED TIME SCALE)
SHORT-CIRCUIT RESPONSE
(VCC = +57V)
PEAK SHORT-CIRCUIT RESPONSE
(VCC = +48V EXPANDED TIME SCALE)
MAX5913/4 toc22
MAX5913/4 toc24
MAX5913/4 toc23
A
A
A
0
0
0
B
B
B
0
0
0
40µs/div
1ms/div
1µs/div
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 200mA/div
B: VGATE, 20V/div
ON = RLYON = VDD
A: IOUT, 200mA/div
B: VGATE, 20V/div
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 5A/div
B: VGATE, 20V/div
SHORT-CIRCUIT RESPONSE
(VCC = +57V, EXPANDED TIME SCALE)
SHORT-CIRCUIT RESPONSE
(VCC = +72V)
PEAK SHORT-CIRCUIT RESPONSE TIME
(VCC = +57V, EXPANDED TIME SCALE)
MAX5913/4 toc25
MAX5913/4 toc27
MAX5913/4 toc26
A
A
A
0
0
0
B
B
B
0
40µs/div
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 200mA/div
B: VGATE, 20V/div
0
0
1ms/div
1µs/div
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 5A/div
B: VGATE, 20V/div
ON = RLYON = VDD
A: IOUT, 200mA/div
B: VGATE, 50V/div
_______________________________________________________________________________________
7
MAX5913/MAX5914
Typical Operating Characteristics (continued)
(VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, AGND = DGND = 0, RTIM = open, TA = +25°C, unless otherwise specified.)
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
MAX5913/MAX5914
Typical Operating Characteristics (continued)
(VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, AGND = DGND = 0, RTIM = open, TA = +25°C, unless otherwise specified.)
PEAK SHORT-CIRCUIT RESPONSE TIME
(VCC = +72V, EXPANDED TIME SCALE)
OPEN-CIRCUIT THRESHOLD
vs. INPUT VOLTAGE
MAX5913/4 toc29
MAX5913/4 toc28
4.0
THRESHOLD VOLTAGE (mV)
3.8
A
A
0
0
B
B
TA = +85°C
3.6
3.4
3.2
3.0
2.8
TA = +25°C
2.6
TA = -40°C
2.4
0
0
MAX5913/14 toc30
SHORT-CIRCUIT RESPONSE
(VCC = +72V, EXPANDED TIME SCALE)
2.2
2.0
1µs/div
40µs/div
OPEN-CIRCUIT THRESHOLD
vs. TEMPERATURE
tO vs RRTIM
MAX5913/4 toc32
120
100
A
0
MAX5913/4 toc33
3.5
INPUT VOLTAGE (V)
OPEN-CIRCUIT GLITCH DELAY
MAX5913/14 toc31
TA = -40°C, +25°C, +85 °C
80
0
3.0
C
0
2.0
-40
-15
10
35
TEMPERATURE (°C)
60
40
VCC = +36V, +48V,
+57V, AND +72V
2.5
8
B
tO (ms)
THRESHOLD VOLTAGE (mV)
4.0
33 36 39 42 45 48 51 54 57 60 63 66 69 72
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 5A/div
B: VGATE, 50V/div
ON = RLYON = VDD, RL = 1Ω, RRTIM = 2kΩ
A: IOUT, 200mA/div
B: VGATE, 50V/div
60
85
40ms/div
ON = RLYON = VDD, STATOUT = LOW
A: IOUT, 20mA/div
B: VSTAT, 5V/div
C: VGATE, 20V/div
20
0
0
5
10
15
20
25
RRTIM (kΩ)
_______________________________________________________________________________________
30
35
40
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
RETRY DUTY CYCLE vs. DC
to vs. INPUT VOLTAGE
CHANNEL-TO-CHANNEL CROSSTALK
MAX5913/4 toc36
MAX5913/4 toc34
MAX5913/4 toc35
125
100
A
RRTIM = 40kΩ
tO (ms)
0
VTEST
5V/div
75
B
0
50
RRTIM = OPEN
25
C
RRTIM = 2kΩ
VOUT
10mV/div
0
0
1.8
2.1
2.4
2.7
3.0
3.3
3.6
VDD (V)
20µs/div
100ms/div
VGATE = 20V/div, RRTIM = 2kΩ
A: VGATE, 20V/div, DC = FLOATING (4%)
B: VGATE, 20V/div, DC = VDD (2%)
C: VGATE, 20V/div, DC = GND (1%)
SEE FIGURE 4 FOR TEST CIRCUIT
Pin Description
PIN
NAME
FUNCTION
FAULT
Fault Output. FAULT is an open-drain output that goes low when a fault is detected on any
of the four channels. FAULT is low when an OC (open circuit) is detected, or when the
MAX5913/MAX5914 is in auto-retry caused by an overcurrent condition. When RTRYEN is
low, and the channel switch is latched off due to overcurrent condition, FAULT remains
low until ON_ is driven low.
2, 3, 4, 5
STAT1,
STAT2,
STAT3,
STAT4
Status Outputs. STAT_ are push-pull outputs. Depending on the STATOUT pin status,
STAT_ flags either the Power-OK_ or Port-OC_ status.
Power-OK_ high indicates:
a) ON_ input is high
b) The switch port is fully on and startup is completed (VCSP_ - VOUT_) < VSWON
c) Input voltage is above VUVLO
d) Switch is not in current limit.
Power-OK_ low indicates a fault with any of the above conditions.
Port-OC_ output high indicates that the switch is latched off because the switch current is
less than the open current threshold Port-OC is low otherwise.
6, 10, 24, 28
CSP4, CSP3, CSP2,
CSP1
Current-Sense Positive Input. Connect to VCC and place a current-sense resistor from CSP_
to DRAIN_. Use Kelvin sense trace from current-sense resistor to CSP_ (see Figure 7).
7, 11, 23, 27
DRAIN4, DRAIN3,
DRAIN2, DRAIN1
1
MOSFET Drain Current-Sense Negative Input. Connect to drain of power MOSFET and
connect a current-sense resistor from CSP_ to DRAIN_. Use Kelvin sense trace from
current-sense resistor to DRAIN_ (see Figure 7).
_______________________________________________________________________________________
9
MAX5913/MAX5914
Typical Operating Characteristics (continued)
(VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, AGND = DGND = 0, RTIM = open, TA = +25°C, unless otherwise specified.)
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
Pin Description (continued)
PIN
NAME
8, 12, 21, 25
OUT4, OUT3,
OUT2, OUT1
9, 13, 22, 26
GATE4, GATE3,
GATE2, GATE1
14
VRLY
15, 16, 18,
19
RLYD3, RLYD4,
RLYD1, RLYD2
17, 30
DGND
Digital Ground. All logic voltages are referred to DGND. The voltage difference between
DGND and AGND can be up to ±4V.
20
AGND
Analog Ground. All analog voltages are referred to AGND.
29
VCC
Analog Power Supply. Connect VCC to +35V to +72V power supply. UVLO circutry turns
off MOSFET switch and relay for VCC < VUVLO. Bypass VCC to AGND with a 1µF
capacitor.
31
OCEN
Open-Circuit Detector Enable Input. Drive OCEN high to enable open-circuit detector, or
drive low to disable. When enabled, the open-circuit detector waits for a 900ms delay
after Power-OK conditions are met before enabling the open-circuit detector function.
32
STATOUT
Status Output Multiplexer (MUX) Control Input. Controls the signal MUX into the STAT_
outputs. Drive STATOUT high to route Power-OK_ status to STAT_ outputs, or drive
STATOUT low to route Port-OC_ status to STAT_ outputs.
33
RTRYEN
Auto-Retry Enable Input. Drive RTRYEN high to enable auto-retry. Drive RTRYEN low to
enable switch latch-off mode. When switch is latched off, a high-to-low transition on the
ON_ control input clears the latch.
10
FUNCTION
MOSFET Source Output Voltage Sense. Connect to power MOSFET source through a
100Ω series resistor.
MOSFET Gate Driver Output. The MAX5913/MAX5914 regulate the gate-drive voltage to
(VCC + 9V) to fully turn on the power N-channel MOSFET. GATE_ sources 10µA during
startup to slowly turn-on the MOSFET switch. GATE_ sinks 1mA to turn-off the MOSFET
switch.
Relay Supply Voltage Input. Referenced to DGND.
Relay-Drive Output. For the MAX5913, RLYD_ sinks 100mA when the relay driver is
enabled. For the MAX5914, RLYD_ sources 1mA when the relay driver is enabled.
Duty-Cycle Programming Input. DC sets the minimum off-time after an overcurrent
condition latches off the switch. When RTRYEN is high, DC sets the auto-retry duty cycle.
Drive DC low for 1% duty cycle, drive DC high for 2%, or leave DC floating for 4%
duty cycle.
34
DC
35, 37, 39,
41
RLYON1, RLYON2,
RLYON3, RLYON4
36, 38, 40,
42
ON1, ON2, ON3,
ON4
MOSFET Switch Control Input. Drive ON_ high to enable GATE_ to turn on MOSFET
switch. RLYON_ must be high to enable the switch. Drive ON_ low to disable the switch.
Pulling ON_ low also resets the latch when RTRYEN is low or if the switch is latched off
due to open-circuit detection.
43
RTIM
Timing Oscillator Frequency Set Input. Connect a 2kΩ to 40kΩ resistor from RTIM to
DGND to set the maximum continuous overcurrent time, tO. Leave RTIM unconnected to
set default 6.4ms tO.
44
VDD
Digital Power Supply. Bypass VDD to DGND with a 1µF capacitor.
Relay-Driver Control Input. Drive RLYON_ high to enable RLYD_, drive RLYON_ low to
turn off MOSFET switch for the channel and disable RLYD_.
______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
Switch and Relay Control Inputs
The MAX5913/MAX5914 ON_ inputs turn on the corresponding MOSFET switch. Driving ON_ high turns on
the switch if the corresponding RLYON is driven high,
and V CC > V UVLO for more than 25.6ms. Driving
RLYON_ high immediately turns on the corresponding
relay, and activates the 25.6ms delay after which the
corresponding ON_ input is active. Driving RLYON_ low
immediately turns off the switch and activates a 3.2ms
delay after which the relay is turned off. These internal
delays safely allow driving ON_ and RLYON_ simultaneously. The relay is turned on while the switch is off so
that there is no voltage across the relay contacts. The
relay is turned off while the switch is off so that there is
no current flowing when the relay contacts are opened
(see Figure 3).
Input Voltage and UVLO
The MAX5913/MAX5914 operate from +35V to +72V
supply voltage. VCC powers the MAX5913/MAX5914
analog circuitry and is monitored continuously during
startup and normal operation. The MAX5913/MAX5914
keep all MOSFET switches and relay drivers securely
off before V CC rises above V UVLO . The MAX5913/
MAX5914 turn off all MOSFET switches and relay drivers after VCC falls below VUVLO - VUVLO,H.
Startup
When the turn-on condition is met (see Input Voltage
and UVLO and Switch and Relay Control Inputs sections), the MAX5913/MAX5914 slowly turn on the external MOSFET switch by charging its gate using a
constant current source, IGATE (10µA typ). The gate
voltage slope is determined by the total gate capacitance CGATE connected to this node. Since the output
voltage follows the gate voltage, thus the output rises
with a slope determined by:
∆VOUT
I
= GATE
∆t
CGATE
If a capacitor load is connected to the output the total
current through the FET is:
I = IGATE
CL
CGATE
+ IL
where CL is the load capacitance and IL is the current
required by any load connected to the output during
the startup phase.
If the current through the FET reaches the programmed
current-limit value:
IMAX =
VSC
RSENSE
the internal current-limit circuitry activates and regulates this FET current to be a value, ILIM, that depends
on VOUT (IFLBK) (Figure 8). See the Current Sensing
and Regulation section for more information. In this
case the maximum rate of change of the output is
determined by:
∆VOUT ILIM − IL
=
∆t
CL
The formula shows the necessity for ILIM to be larger
than IL in order to allow the output voltage to rise. The
foldback function is active as long as the circuit is in
overcurrent condition. Should the overcurrent condition
persist for a period longer than the maximum time tO,
the switch is latched off and GATE_ is discharged to
ground with a 1mA pulldown current.
If auto-retry is enabled, the switch turns on again after a
waiting period, tOFF, which is determined by the programmed duty cycle.
After the startup, the internal charge pumps provide
(VCC + 9V) typical gate overdrive to fully turn on the
switch. When the switch is fully on (voltage drop across
the switch is ≤ 1.5V), and the switch is not in current
limit, the Power-OK signal is asserted.
Current Sensing and Regulation
The MAX5913/MAX5914 control port current with using
two voltage comparators (dual-level detection) that
sense the voltage drop across an external currentsense resistor. Connect CSP_ to VCC and connect a
current-sense resistor between CSP_ and DRAIN_.
Kelvin sensing should be used as shown in Figure 7.
______________________________________________________________________________________
11
MAX5913/MAX5914
Detailed Description
The MAX5913/MAX5914 quadruple hot-swap controllers
provide Power-Over-MDI, also known as Power-OverLAN systems (Figure 5). The MAX5913/MAX5914 enable
control of four external N-channel MOSFET switches
from a single VCC ranging from +35V to +72V, with timing control and current-limiting functions built in.
Features include undervoltage lockout (UVLO), 100mA
relay drivers, dual-level current sense, foldback current
limit, programmable overcurrent time and auto-retry
periods, internal charge pumps to drive external MOSFET and soft-start, port status output indicating PowerOK or open-circuit conditions (Figure 6).
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
Test Circuits and Timing Diagrams
VUVLO
VCC
(VCC - VOUT) ≤ 1.5V
(POWER-OK IS GOOD)
VCC
OC DETECTOR ENABLED
(INTERNAL SIGNAL)
tOC
VGATE
+1V
+1V
tD, UVLO
VGATE
tLPFD
Figure 2. Open-Circuit Detector Deglitch Delay
Figure 1. UVLO Deglitch Delay
0.33Ω
470µF
270µF
VIH
RLYON
200Ω
100Ω
VTEST
VIL
CSP1
DRAIN1 GATE1 OUT1
ON1
RLYON1
VGATE
+42V
+1V
VCC
270µF
MAX5913/MAX5914
270µF
ON2
RLYON2
tON_DEL
tOFF_DEL
CSP2
DRAIN2 GATE2 OUT2 DGND
3.3V
VRLY
100Ω
RLYD
(MAX5913)
0.33Ω
VOUT
270µF
Figure 3. Port Turn-On Delay, Relay Turn-Off Delay
Figure 4. Channel-to-Channel Crosstalk Test Circuit
The first comparator compares the sensed voltage
against VSC threshold (typically 142.5mV). Choose a
sense resistor as follows:
drop across the sense resistor is lowered to a minimum
value of 48mV (typ). This foldback feature helps reduce
the power dissipation in the external power FET during
output overload and output short-circuit conditions. If a
load with very low activation voltage is permanently
connected to the output, make the minimum limit current sufficiently larger than the load current. If the load
current indeed exceeds the foldback-limit value the
MAX5913/MAX5914 are not able to power-up the
switch.
RSENSE = VSC / IMAX
where IMAX is the maximum current allowed through
the switch.
When IMAX is reached, foldback current-limit circuitry
regulates the current limit as a function of VOUT (Figure
8). As VOUT approaches zero the maximum voltage
12
______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
MAX5913/MAX5914
VCC = +35V TO +72V
1.0µF
ON1
ON2
ON3
ON4
RLYON1
RLYON2
RLYON3
RLYON4
OCEN
RTRYEN
STATOUT
DC
DIGITAL
INTERFACE
INPUTS
+12V
+3.3V
VCC
CSP1
0.33Ω
DRAIN1
FDT3612
N
GATE1
NO
PORT 1
NO
PORT 4
OUT1
100Ω
MAX5913
K1
VRLY
VRLY
VDD
VCC
1µF
1kΩ
CSP4
FAULT
0.33Ω
STAT1
DIGITAL
INTERFACE
OUTPUTS
STAT2
DRAIN4
STAT3
FDT3612
N
GATE4
STAT4
OUT4
100Ω
RTIM
K4
2kΩ
DGND
AGND
RLYD1
RLYD4
VRLY
Figure 5. Typical Application Circuit
A second comparator with a detection threshold of
3VSC activates a fast 15mA pulldown of the gate. The
purpose of this comparator is to rapidly discharge the
gate when a momentary current peak overstresses the
external FET helping the regulation to act more rapidly.
The sense resistor is also used to detect an open-circuit
or low-current condition with a typical threshold of 3mV.
Open-Circuit Detection
after a 900ms delay. The open-circuit voltage threshold
is set at 3mV across the current-sense resistor. Drive
OCEN high to enable open-circuit detectors for all four
ports. Drive OCEN low to disable the detectors. Each
port has an open-circuit flag that can be read from
STAT_ outputs when the STATOUT is low. STAT_ output
high indicates that the switch is latched off due to an
open-circuit condition on that port. To reset the latch
pull ON_ low and then high to restart (Table 1).
The MAX5913/MAX5914 detect when a port has low
current or is open circuit, and turn off the switch to that
port. After the switch is turned on and the Power-OK
conditions are met, the open-circuit detector is enabled
The MAX5913/MAX5914 sense the output voltage of
the port at the source of the external MOSFET switch.
Output Voltage Sense and Power-OK
______________________________________________________________________________________
13
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
RTRYEN DC
RTIM
CSP
VCC
420mV
142.5mV
3mV
FOLDBACK
NL CONTROL
DC COUNTER
RESET LOGIC
RSENSE
DUAL LEVEL
DETECTION
FROM LOGIC
CONTROLLER
UVLO
TIMING
OSCILLATOR
CHARGE PUMP
DRAIN
10µA
1.236V
CSP -1.5V
POK COMPARATOR
LOGIC
CONTROLLER
GATE
VDD
OUT
VDD
TO LOGIC
OPEN-CIRCUIT CONTROLLER
DETECTOR
1mA
8µA
VRLY
RELAY
CONTROL
1mA
DGND
DELAY
OCEN
ON
AGND
RLYON
RLYD
DGND
Figure 6. Functional Diagram
Internally the circuit compares the output voltage with
VCC to determine when the FET is completely on. A
“Power-OK” condition is met when:
(VCC - VOUT) ≤ 1.5V
The internal circuit monitors V OUT to determine the
value of the foldback current when the circuit goes into
current-limit conditions. The value of the current limit
decreases as the output voltage decreases in order to
limit the power dissipation of the FET. The nonlinear
relationship between V OUT and I LIM is depicted in
Figure 8.
The foldback circuit is active whenever the MAX5913/
MAX5914 is in current-limit mode after an overcurrent
condition has been detected.
14
Connect a catch diode to analog ground and a 100Ω
resistor in series with OUT_ to limit the current during
negative inductive kicks that can bring OUT_ below the
ground potential (Figure 5).
Relay Drivers
The MAX5913/MAX5914 include on-chip relay drivers,
RYLD_, capable of sinking 100mA. When RLYON_
goes high the MAX5913/MAX5914 immediately enable
the relay driver, and the corresponding ON_ switch
control input is delayed 25.6ms to allow the relay to
close under a zero-voltage condition. When RLYON_
goes low, the MAX5913/MAX5914 immediately turn off
the corresponding switch, and then turn off the relay
driver after a 3.2ms delay, ensuring the relay contacts
open under a zero-current condition. The polarity of the
______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
However, the MAX5913/MAX5914 always waits a minimum time tOFF, before restarting the switch.
Logic Interface and Status Outputs
The MAX5913/MAX5914 logic interface controls the
device functionality. All the basic control functions for
the four switches are separated. ON_ enables individual
on/off control of each MOSFET (the corresponding relay
must be on to turn on the switch). RLYON_ enables individual on/off control of each relay. STAT_ indicates
Power-OK or Port-OC (open circuit) status of each
switch. The other logic pins are common to all four
switches. A single FAULT output goes low when any of
the four channels is latched off. Driving OCEN high
enables the open-circuit detectors. Driving RTRYEN
high enables the auto-retry function, RTRYEN low
enables the switch latch-off function. DC, a three-level
logic input, programs the duty cycle. The STATOUT
input selects the signal multiplexed at STAT_ outputs
(Table 1.). Driving STATOUT high routes Power-OK status to the STAT_ outputs. Driving STATOUT low routes
Port-OC status to the STAT_ outputs.
Programmable Timing, RTIM
An external resistor from RTIM to DGND sets the frequency of the internal oscillator upon which tO and the
auto-retry times are based.
Use 2kΩ to 40kΩ resistors for RRTIM.
tO = (RRTIM / 2kΩ) (6.4ms)
If RTIM is unconnected (floating), an internal resistor
sets tO to a nominal 6.4ms.
Auto-Retry and Programmable Duty Cycle
The MAX5913/MAX5914 feature auto-retry with
adjustable duty cycle. Driving RTRYEN high enables
the auto-retry function. When the switch encounters an
overcurrent for a period greater than tO the switch is
turned off, and remains off for a tOFF programmed by
DC, a three-level input. After the tOFF period, the switch
is automatically turned on again. When the port
encounters a continuous overload or short-circuit condition, the switch turns on and off repeatedly with the
on duty cycle of 1%, 2%, or 4% depending on the DC
input state (Table 2). When RTRYEN is low, the autoretry is disabled, and a fault condition at the switch
turns the switch off and the switch remains latched off.
Driving the corresponding ON control input low resets
the latch. Pulling ON high to turn on the switch.
Fault Management
UVLO and Power-OK
The MAX5913/MAX5914 monitor the VCC input voltage
and each switch’s current and voltage to determine
Power-OK, overcurrent, or Port-OC status. When VCC
falls below the UVLO threshold, FAULT goes low and
all four switches and relays are turned off. When the
volage across the switch is less than 1.5V, the switch is
fully on, and if the switch is not in current limit or open
circuit, Power-OK status is good (high).
Open-Circuit Faults
With the open circuit detector enabled, when any
switch current falls below the open-circuit detector
Table 1. Status Output
PORT_ CONDITION
OCEN
STATOUT
STAT_
Enabled. Switch fully on and not in current limit
x
H
H
(Power-OK_ is good)
Enabled. Switch in current limit, or VDS > 1.5V
x
H
L
(Power-OK_ is not good)
Enabled. Switch current is less than OC threshold,
port is latched off
H
L
H
(Port-OC_ , Port current is low or zero)
Enabled. Switch fully on and output current is greater
than OC threshold
H
L
L
(Port-OC_ , Port current is good)
Disabled
L
L
L
______________________________________________________________________________________
15
MAX5913/MAX5914
MAX5913 RLYD_ is opposite to that of the MAX5914.
For the MAX5913, upon the assertion of the RLYON_
input RLYD_ sinks 100mA to DGND. For the MAX5914
when RLYON_ is high, an internal 1mA current source
pulls up RLYD_ to VDD. A 100mA catch diode is internally connected between RYLD_ and VRLY to protect
the MAX5913/MAX5914 from inductive kicks from the
relay coil. VRLY must be connected to the high-side
relay supply voltage.
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
threshold current, the open-circuit detector turns off the
switch after a 25.6ms delay, FAULT goes low and the
Port-OC flag is set for that switch. To clear the switch
latched-off condition, FAULT and Port-OC flags drive
the corresponding ON input low.
Overcurrent Faults
When an on switch current exceeds the current-limit
threshold, foldback circuitry activates and regulates the
switch current. When current limit lasts for longer than
tO, the switch latches off. The Power-OK status flag is
set low, and the FAULT flag is set. If auto-retry is
enabled, the switch remains off for a period tOFF. If
auto-retry is disabled, the switch remains latched off,
and FAULT is low. Reset the latch and FAULT by driving corresponding ON_ low.
Applications Information
Considerations for circuit design include output capacitor requirements, current-limit requirements, setting the
maximum on-time in current limit, and choosing a suitable MOSFET and on-time duty cycle in auto-retry.
Output Capacitor Requirements
The load capacitor requirements should be determined
first, as this affects the required startup.
Current-Limit Requirements
(Choosing RSENSE)
The current limit should be set to at least 20% higher
than the expected full load current. If current limit is
also used to control startup current, then set this limit
high enough so that the output voltage can rise and
settle before tO elapses (see Setting tO section below).
Setting tO (Choosing RRTIM)
Choose the tO time by connecting a 2kΩ to 40kΩ resistor
from RTIM to DGND. The minimum 6.4ms tO is set with
RRTIM = 2kΩ. The maximum 128ms tO is set with RRTIM
= 40kΩ set according to the following equation:
tO = (RRTIM / 2kΩ) (6.4ms).
tO should be chosen appropriately, depending on the
startup condition. There are two cases:
1) For startup without current limit, when
I = IGATE
CL
VSC
+ IL <
CGATE
RSENSE
on during large output load-current transients. The
smaller the tO, the faster the MAX5913/MAX5914
turn off the external FET in case of output overload
or short-circuit condition.
2) For startup with current limit, when
 CL

VSC
I = IGATE 
+ IL  ≥
 CGATE
 RSENSE
which is expected when
CL
CGATE
is large, tO must be set to be long enough to allow the
output voltage to rise and settle before tO elapses. In
this case, tO must satisfy the following equation:
t O = CL
18
V − 18V
+ CL CC
2
IMAX − IL
IMAX − IL
3
where VCC is the input voltage and given that IL < ILIM.
Choosing Power MOSFET
The FET must withstand a short-circuit condition where
its power dissipation is PDISS = VCC ✕ ILIM. The FET
must have sufficient thermal capacitance to prevent
thermal heating damage during the tO time.
Choose Duty Cycle (setting DC)
The duty cycle can be adjusted to allow time for heat to
dissipate between tO cycles, allowing use of smaller
MOSFETs with lower thermal capacitance. For smaller
duty cycle, a smaller FET is sufficient. See Table 2 for
setting the duty cycle.
The auto-retry off-time should not be too long to keep
system wait time during retry period to a reasonable
value. For example, when tO is set to 128ms and duty
cycle is set to 1%, the retry time is 99 ✕ 128ms = 12.7s.
Application Circuits
In a typical LAN system there are two ways to deliver
power over the LAN cable. Power can be supplied to
the unused cable pairs, or power can be supplied over
the signal pairs (Figures 9 and 10).
the startup current does not reach the maximum current-limit threshold and tO will not activate during
startup condition. In this case, set t O to a small
value, but large enough to allow the switch to remain
16
______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
ILIM
CSP_
DRAIN_
SENSE
RESISTOR
∆
IMAX =
VSC
RSENSE
IMAX /3
MAX5913
MAX5914
Figure 7. Recommended Layout for Kelvin-Sensing Current
Through Sense Resistor
0
VOUT
18V
Figure 8. Foldback Current-Limit Response
Table 2. Duty Programming Cycle
DC
tOFF
DUTY CYCLE
0
99 ✕ tO
1%
1
49 ✕ tO
2%
Open
24 ✕ tO
4%
______________________________________________________________________________________
17
MAX5913/MAX5914
HIGH-CURRENT PATH
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
LAN SWITCH
N
+48V POWER OVER
SIGNAL PAIRS
RJ45
RJ45
+48V
PD
+48V
OUT
MAX5913
MAX5914
CAT 5
DATA
POWERED
DEVICE
(IP PHONE, ETC.)
Figure 9. Power Sent Over Signal Pairs
+48V POWER OVER
SPARE PAIRS
MIDSPAN HUB
RJ45
RJ45
RJ45
RJ45
CAT 5
PD
N
+48V
OUT
CAT 5
POWERED
DEVICE
(IP PHONE, ETC.)
+48V
MAX5913
MAX5914
Figure 10. Power Sent Over Spare Pairs
Chip Information
TRANSISTOR COUNT: 14,622
PROCESS: BiCMOS
18
______________________________________________________________________________________
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
VCC = +35V TO +72V
ON1
ON2
ON3
ON4
RLYON1
RLYON2
RLYON3
RLYON4
OCEN
RTRYEN
STATOUT
DC
DIGITAL
INTERFACE
INPUTS
+12V
+3.3V
VCC
CSP1
DRAIN1
GATE1
N
PORT 1
OUT1
MAX5913
VRLY
VRLY
VDD
VCC
CSP4
FAULT
DIGITAL
INTERFACE
OUTPUTS
STAT1
STAT2
DRAIN4
STAT3
GATE4
STAT4
N
PORT 4
OUT4
RTIM
DGND
AGND
RLYD1
RLYD4
VRLY
______________________________________________________________________________________
19
MAX5913/MAX5914
Typical Operating Circuit
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MQFP44.EPS
MAX5913/MAX5914
+48V Quad Hot-Swap Controllers For
Power-Over-LAN
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.