OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX5949BESA+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
General Description
The MAX5949A/MAX5949B are hot-swap controllers that
allow a circuit card to be safely hot plugged into a live
backplane. The MAX5949A/MAX5949B operate from
-20V to -80V and are well-suited for -48V power systems.
These devices are pin and function compatible with the
LT4250 and pin compatible with the LT1640.
The MAX5949A/MAX5949B provide a controlled turn-on
to circuit cards preventing glitches on the power-supply
rail and damage to board connectors and components.
The MAX5949A/MAX5949B provide undervoltage, over-
voltage, and overcurrent protection. These devices
ensure the input voltage is stable and within tolerance
before applying power to the load.
Both the MAX5949A and MAX5949B protect a system
against overcurrent and short-circuit conditions by turn-
ing off the external MOSFET in the event of a fault con-
dition. The MAX5949A/MAX5949B also provide
protection against input voltage steps. During an input
voltage step, the MAX5949A/MAX5949B limit the cur-
rent drawn by the load to a safe level without turning off
power to the load.
Both devices feature an open-drain power-good status
output (PWRGD for the MAX5949A or PWRGD for the
MAX5949B) that can be used to enable downstream
converters.
The MAX5949A/MAX5949B are available in an 8-pin SO
package. Both devices are specified for the extended
-40°C to +85°C temperature range.
Applications
Telecom Line Cards
Network Switches/Routers
Central-Office Line Cards
Server Line Cards
Base-Station Line Cards
Central-Office Switching
-48V Distributed Power Systems
Negative Power-Supply Controls
Features
o Allow Safe Board Insertion and Removal
from a Live -48V Backplane
o Pin and Function Compatible with LT4250L
(MAX5949A)
o Pin Compatible with LT1640L (MAX5949A)
o Pin and Function Compatible with LT4250H
(MAX5949B)
o Pin Compatible with LT1640H (MAX5949B)
o Circuit-Breaker Immunity to Input Voltage Steps
and Current Spikes
o Withstand -100V Input Transients with No
External Components
o Programmable Inrush and Short-Circuit Current
Limits
o Operate from -20V to -80V
o Programmable Overvoltage Protection
o Programmable Undervoltage Lockout
o Power Up into a Shorted Load
o Power-Good Control Output
MAX5949A/MAX5949B
-48V Hot-Swap Controllers
with External R
SENSE
________________________________________________________________
Maxim Integrated Products
1
GATE
SENSEV
EE
1
+
2
8
7
V
DD
DRAINOV
UV
PWRGD
(PWRGD)
SO
TOP VIEW
3
4
6
5
MAX5949A
MAX5949B
( ) FOR MAX5949B.
Pin Configuration
Ordering Information
19-3494; Rev 1; 8/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX5949AESA+ -40°C to +85°C 8 SO
MAX5949BESA+ -40°C to +85°C 8 SO
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX5949A/MAX5949B
-48V Hot-Swap Controllers
with External R
SENSE
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
EE
= 0V, V
DD
= 48V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Notes 2, 5)
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.
(All voltages are referenced to V
EE
, unless otherwise noted.)
Supply Voltage (V
DD
- V
EE
) .................................-0.3V to +100V
PWRGD, PWRGD .................................................-0.3V to +100V
DRAIN (Note 1)........................................................-2V to +100V
PWRGD to DRAIN .............................................… -0.3V to +95V
PWRGD to V
DD
........................................................-95V to +85V
SENSE (Internally Clamped) .................................-0.3V to +1.0V
GATE (Internally Clamped) ....................................-0.3V to +18V
UV and OV..............................................................-0.3V to +60V
Current Through SENSE ...................................................±40mA
Current into GATE...........................................................±300mA
Current into DRAIN .........................................-100mA to +20mA
Current into Any Other Pin................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
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) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLIES
Operating Input Voltage Range V
DD
20 80 V
Supply Current I
DD
(Note 3) 0.7 2 mA
GATE DRIVE AND CLAMPING CIRCUITS
GATE Pin Pullup Current I
PU
Gate drive on, V
GATE
= V
EE
-30 -45 -60 µA
GATE Pin Pulldown Current I
PD
Gate drive off, V
GATE
= 2V, T
A
= +25°C 24 50 70 mA
External Gate Drive ∆V
GATE
V
GATE
- V
EE
, 20V ≤ V
DD
≤ 80V 10 13.5 18 V
GATE to V
EE
Clamp Voltage V
GSCLMP
V
GATE
- V
EE
, I
GS
= 30mA 15 16.4 18 V
CIRCUIT BREAKER
Current-Limit Trip Voltage V
CL
V
CL
= V
SENSE
- V
EE
40 50 60 mV
SENSE Input Bias Current I
SENSE
V
SENSE
= 50mV 0 -0.2 -2 µA
UNDERVOLTAGE LOCKOUT
Internal Undervoltage-Lockout
Voltage High
V
UVLOH
V
DD
increasing 13.8 15.4 17.0 V
Internal Undervoltage-Lockout
Voltage Low
V
UVLOL
V
DD
decreasing 11.8 13.4 15.0 V
UV PIN
UV High Threshold V
UVH
UV voltage increasing 1.240 1.255 1.270 V
UV Low Threshold V
UVL
UV voltage decreasing 1.105 1.125 1.145 V
UV Hysteresis V
UVHY
130 mV
UV Input Bias Current I
INUV
V
UV
= V
EE
0-0.5µA
OV PIN
OV High Threshold V
OVH
OV voltage increasing 1.235 1.255 1.275 V
OV Low Threshold V
OVL
OV voltage decreasing 1.210 1.235 1.255 V
OV Hysteresis V
OVHY
20 mV
OV Input Bias Current I
INOV
V
OV
= V
EE
0-0.5µA
Note 1: Test condition per Figure 1. DRAIN current must be limited to the specified 100mA maximum.
MAX5949A/MAX5949B
-48V Hot-Swap Controllers
with External R
SENSE
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
EE
= 0V, V
DD
= 48V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Notes 2, 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWRGD OUTPUT SIGNAL REFERENCED TO DRAIN
DRAIN Input Bias Current I
DRAIN
V
DRAIN
= 48V 10 80 250 µA
D RAIN Thr eshol d for P ow er - G ood V
DL
V
DRAIN
- V
EE
threshold for power-good
condition, DRAIN decreasing
1.1 1.4 2.0 V
GATE High Threshold V
GH
∆V
GATE
- V
GATE
threshold for power-good
condition, ∆V
GATE
- V
GATE
decreasing
1.0 1.4 2.0 V
PWRGD, PWRGD Output
Leakage
I
OH
PWRGD (MAX5949A) = 80V, V
DRAIN
= 48V,
PWRGD (MAX5949B) = 80V, V
DRAIN
= 0V
10 µA
PWRGD Output Low Voltage V
OL
V
PWRGD
- V
EE;
V
DRAIN
- V
EE
< V
DL
,
I
SINK
= 5mA (MAX5949A)
0.11 0.4 V
PWRGD Output Low Voltage V
OL
V
PWRGD
- V
DRAIN
; V
DRAIN
= 5V,
I
SINK
= 1mA (MAX5949B)
0.11 0.4 V
AC PARAMETERS
OV High to GATE Low t
PHLOV
Figures 2a, 3 0.5 µs
UV Low to GATE Low t
PHLUV
Figures 2a, 4 0.4 µs
OV Low to GATE High t
PLHOV
Figures 2a, 3 4 µs
UV High to GATE High t
PLHVL
Figures 2a, 4 5.5 µs
SENSE High to GATE Low t
PHLSENSE
Figures 2a, 5a 1 3 µs
Current Limit to GATE Low t
PHLCB
Figures 2b, 5b 350 500 650 µs
MAX5949A, Figures 2a, 6a 1.8DRAIN Low to PWRGD Low
DRAIN Low to (PWRGD - DRAIN)
High
t
PHLDL
MAX5949B, Figures 2a, 6a 3.4
µs
MAX5949A, Figures 2a, 6b 1.6
GATE High to PWRGD Low
GATE High to (PWRGD - DRAIN)
High
t
PHLGH
MAX5949B, Figures 2a, 6b 2.5
µs
TURN-OFF
Latch-Off Period t
OFF
(Note 4) 51 64 78 ms
Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to V
EE
,
unless otherwise specified.
Note 3: Current into V
DD
with UV = 3V, OV = DRAIN = PWRGD = SENSE = V
EE
, GATE = open.
Note 4: Minimum duration of GATE pulldown following a circuit-breaker fault. The circuit breaker can be reset during this time by
toggling UV low, but the GATE pulldown does not release until t
OFF
has elapsed.
Note 5: Limits are 100% tested at T
A
= +25°C and +85°C. Limits at -40°C are guaranteed by design.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX5949BESA+T

Mfr. #:
Buy MAX5949BESA+T
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers 48V- Hot-Swap Controlle
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet