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PDF NCP45524 Data sheet ( Hoja de datos )

Número de pieza NCP45524
Descripción (NCP45524 / NCP45525) Advanced Load Management
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No Preview Available ! NCP45524 Hoja de datos, Descripción, Manual

NCP45524, NCP45525
ecoSWITCHt
Advanced Load Management
Controlled Load Switch with Low RON
The NCP4552x series of load switches provide a component and
area-reducing solution for efficient power domain switching with
inrush current limit via soft start. These devices are designed to
integrate control and driver functionality with a high performance low
onresistance power MOSFET in a single package. This cost effective
solution is ideal for power management and hot-swap applications
requiring low power consumption in a small footprint.
Features
Advanced Controller with Charge Pump
Integrated N-Channel MOSFET with Low RON
Input Voltage Range 0.5 V to 13.5 V
Soft-Start via Controlled Slew Rate
Adjustable Slew Rate Control (NCP45525)
Power Good Signal (NCP45524)
Extremely Low Standby Current
Load Bleed (Quick Discharge)
This is a PbFree Device
Typical Applications
Portable Electronics and Systems
Notebook and Tablet Computers
Telecom, Networking, Medical, and Industrial Equipment
SetTop Boxes, Servers, and Gateways
Hot Swap Devices and Peripheral Ports
VCC EN PG*
VIN
Bandgap
&
Biases
Control
Logic
Charge
Pump
Delay and
Slew Rate
Control
SR*
GND
BLEED
VOUT
Figure 1. Block Diagram
(*Note: either PG or SR available for each part)
http://onsemi.com
RON TYP
18.0 mW
18.8 mW
21.9 mW
VCC
3.3 V
3.3 V
3.3 V
VIN
1.8 V
5.0 V
12 V
IMAX
6A
1
DFN8, 2x2
CASE 506CC
MARKING DIAGRAM
1
XX MG
G
XX = 4H for NCP45524H
= 4L for NCP45524L
= 5H for NCP45525H
= 5L for NCP45525L
M = Date Code
G = PbFree Package
(Note: Microdot may be in either location)
PIN CONFIGURATION
VIN 1
EN 2
VCC 3
GND 4
9: VIN
(Top View)
8 VOUT
7 VOUT
6 PG or SR
5 BLEED
ORDERING INFORMATION
See detailed ordering and shipping information on page 10 of
this data sheet.
© Semiconductor Components Industries, LLC, 2013
January, 2013 Rev. 0
1
Publication Order Number:
NCP45524/D
Free Datasheet http://www.datasheet4u.com/

1 page




NCP45524 pdf
NCP45524, NCP45525
APPLICATIONS INFORMATION
Enable Control
Both the NCP45524 and the NCP45525 have two part
numbers, NCP4552x-H and NCP4552x-L, that only differ
in the polarity of the enable control.
The NCP4552x-H devices allow for enabling the
MOSFET in an active-high configuration. When the VCC
supply pin has an adequate voltage applied and the EN pin
is at a logic high level, the MOSFET will be enabled.
Similarly, when the EN pin is at a logic low level, the
MOSFET will be disabled. An internal pull down resistor to
ground on the EN pin ensures that the MOSFET will be
disabled when not being driven.
The NCP4552x-L devices allow for enabling the
MOSFET in an active-low configuration. When the VCC
supply pin has an adequate voltage applied and the EN pin
is at a logic low level, the MOSFET will be enabled.
Similarly, when the EN pin is at a logic high level, the
MOSFET will be disabled. An internal pull up resistor to
VCC on the EN pin ensures that the MOSFET will be
disabled when not being driven.
Power Sequencing
The NCP4552x devices will function with any power
sequence, but the output turnon delay performance may
vary from what is specified. To achieve the specified
performance, there are two recommended power sequences:
1) VCC VIN VEN
2) VIN VCC VEN
Load Bleed (Quick Discharge)
The NCP4552x devices have an internal bleed resistor,
RBLEED, which is used to bleed the charge off of the load to
ground after the MOSFET has been disabled. In series with
the bleed resistor is a bleed switch that is enabled whenever
the MOSFET is disabled. The MOSFET and the bleed
switch are never concurrently active.
In order to realize this functionality, the BLEED pin must
be connected to VOUT either directly (as shown in Figures
4 and 7) or through an external resistor, REXT (as shown in
Figures 3 and 6). REXT should not exceed 1 kW and can be
used to increase the total bleed resistance.
Care must be taken to ensure that the power dissipated
across RBLEED is kept at a safe level. REXT can be used to
decrease the amount of power dissipated across RBLEED. If
the load bleed function is not desired, the BLEED pin should
be tied to GND.
Power Good
The NCP45524 devices have a power good output (PG)
that can be used to indicate when the gate of the MOSFET
is fully charged. The PG pin is an active-high, open-drain
output that requires an external pull up resistor, RPG, greater
than or equal to 1 kW to an external voltage source, VTERM,
that is compatible with input levels of all devices connected
to this pin (as shown in Figures 3 and 4).
The power good output can be used as the enable signal for
other activehigh devices in the system (as shown in
Figure 5). This allows for guaranteed by design power
sequencing and reduces the number of enable signals needed
from the system controller. If the power good feature is not
used in the application, the PG pin should be tied to GND.
Slew Rate Control
The NCP4552x devices are equipped with controlled
output slew rate which provides soft start functionality. This
limits the inrush current caused by capacitor charging and
enables these devices to be used in hot swap applications.
The slew rate of the NCP45525 can be decreased with an
external capacitor added between the SR pin and ground (as
shown in Figures 6 and 7). With an external capacitor
present, the slew rate can be determined by the following
equation:
Slew
Rate
+
KSR
CSR
[Vńs]
(eq. 1)
where KSR is the specified slew rate control constant, found
in Table 4, and CSR is the slew rate control capacitor added
between the SR pin and ground. The slew rate of the device
will always be the lower of the default slew rate and the
adjusted slew rate. Therefore, if the CSR is not large enough
to decrease the slew rate more than the specified default
value, the slew rate of the device will be the default value.
The SR pin can be left floating if the slew rate does not need
to be decreased.
http://onsemi.com
5
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