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MAX8555AEUB+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
POWER-UP AND DOWN WAVEFORMS
USING TIMER
MAX8555/55A toc08
5ms/div
V
GATE
V
TIMER
I
MOSFET
1A/div
2V/div
5V/div
REVERSE-CURRENT
SHUTDOWN WAVEFORMS
MAX8555/55A toc09
200ns/div
V
GATE
V
CS-
V
FAULT
I
MOSFET
0A
-2A
5V/div
1V/div
100mV/div
MAX8555/MAX8555A
Low-Cost, High-Reliability, 0.5V to 3.3V ORing
MOSFET Controllers
_______________________________________________________________________________________ 7
UVP SHUTDOWN WAVEFORMS
MAX8555/55A toc10
200ns/div
V
GATE
V
UVP
V
CS-
AC-COUPLED
V
FAULT
2V/div
2V/div
5V/div
100mV/div
OVP SHUTDOWN WAVEFORMS
MAX8555/55A toc11
200ns/div
V
GATE
V
OVP
V
CS-
AC-COUPLED
V
FAULT
1V/div
2V/div
5V/div
100mV/div
POWER-SUPPLY OUTPUT
SHORT-CIRCUIT SHUTDOWN WAVEFORMS
MAX8555/55A toc12
200ns/div
V
GATE1
I
MOSFET2
V
CS+
V
CS-
AC-COUPLED
1V/div
5V/div
200mA/div
100mV/div
V
DD
FAULT SHUTDOWN WAVEFORMS
MAX8555/55A toc13
1µs/div
V
GATE
V
FAULT
V
DD
V
CS-
1V/div
5V/div
1V/div
10V/div
Typical Operating Characteristics (continued)
(V
DD
= 12V, V
CS+
= 1.5V, R
TIMER
= 25kΩ, V
UVP
= 1V, V
OVP
= 0.4V, R
FAULT
= 50kΩ to output bus, C
VDD
= C
GATE
= C
VL
= 0.01µF, T
A
=
+25°C, R1 = 2Ω in Figure 3, MAX8555A, unless otherwise noted.)
MAX8555/MAX8555A
Low-Cost, High-Reliability, 0.5V to 3.3V ORing
MOSFET Controllers
8 _______________________________________________________________________________________
PIN
NAME
FUNCTION
1
GATE
Gate-Drive Output. Nominal GATE load is a 0.01µF capacitor to ground. Gate is discharged to GND in
shutdown.
2 GND Ground
3VL
Low-Voltage Optional Input Power. Leave disconnected when V
DD
= 8V to 13.25V, or connect V
DD
to VL
when V
DD
= 3V to 5.5V. Bypass VL to GND with a 0.01µF capacitor.
4V
DD
Power-Supply Input. Connect to an 8V to 13.25V supply or connect to VL when using a 3V to 5.5V supply.
Bypass V
DD
with a 0.01µF capacitor to ground.
5 UVP
Undervoltage-Protection Input. Connect UVP to the center of a resistor-divider from CS+ to GND. Connect
UVP to VL to disable the undervoltage protection.
6
TIMER
Timer Input. Connect a resistor from TIMER to GND to select the charge-pump operating frequency. Drive
TIMER low (< 0.5V) to disable the gate drive. Drive TIMER high (above 1.5V) for charge-pump operation
at 550kHz.
7
FAULT
Open-Drain Fault Output. FAULT is high impedance during normal operation and is pulled to GND when a
fault condition occurs. Connect a pullup resistor of 10kΩ or higher value (50kΩ typ) to a voltage rail of 5.5V
or lower.
8 OVP
Overvoltage-Protection Input. Connect OVP to the center of a resistor-divider from the output bus to GND.
Connect OVP to GND to disable the overvoltage protection.
9 CS-
Current-Sensing Input. Connect CS- to the positive side of the system bus. Bypass with a 1000pF capacitor
to GND.
10 CS+
Current-Sensing Input. Connect CS+ to the positive side of the input power. Bypass with a 1000pF capacitor
to GND.
Pin Description
MAX8555/MAX8555A
Low-Cost, High-Reliability, 0.5V to 3.3V ORing
MOSFET Controllers
_______________________________________________________________________________________ 9
MAX8555/
(MAX8555A)
CS+
CLK
CHARGE
PUMP
CONTROL
LOGIC
SHUTDOWN
GATE
CS-
VL
REVERSE CURRENT
FORWARD CURRENT
100mV
(50mV)
10mV
VL
OVP
UVP
OVERVOLTAGE EXTERNAL
UNDERVOLTAGE
TIMER
I
OSC
0.5V
0.4V
1.25V REF
ENABLE
14.5V
OVERVOLTAGE INTERNAL
40mV
(20mV)
VOLTAGE SHARE
V
DD
VL
REGULATOR
VLGND
VL
FAULT
Figure 1. MAX8555/MAX8555A Functional Diagram
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX8555AEUB+T

Mfr. #:
Buy MAX8555AEUB+T
Manufacturer:
Maxim Integrated
Description:
Gate Drivers .5-3.3V ORing MOSFET Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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