ISL61852BCRZ-T Intersil, ISL61852BCRZ-T Datasheet - Page 16

• Manufacturer Part Number: ISL61852BCRZ-T
• Description: IC USB PWR CTRLR DUAL 10DFN
• Manufacturer: Intersil
• Type: Hot-Swap Switchr

Specifications of ISL61852BCRZ-T

• Applications: USB Overvoltage Protection Controller
• Internal Switch(s): Yes
• Current Limit: 600mA
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application Information
Using the ISL6185xEVAL1Z Platform
General and Biasing Information
There are three (3) evaluation platforms for the ISL6185
family. There is one (1) for each package style, each with
a different continuous output current level and a mix of
enable polarity and output retry or latch options. See the
bottom of Table 1 for standard available evaluation board
options. Figure 30A, illustrates the common schematic
for all of the evaluation boards, consult the individual
package pinouts for those differences.
The evaluation platform is biased and monitored through
numerous labeled test points. See Table 1 for test point
assignments and descriptions.
Upon proper bias and of the evaluation platform and
correct enabling of the IC the ISL6185 will have a
nominal V
enabled switch which is below the continuous current
rating. See Figures 11 and 12 for typical ISL6185 turn-on
and off waveforms.
External current loading in excess of the trip current level
for the particular part being evaluated will result in the
ISL6185 entering the current limiting mode. Figure 14
illustrates the current limiting mode for the ISL6185
product variants with 0.6A of continuous load current
rating. The scope shot shows current limiting for ~12ms
before it is turned off and the fault signal is asserted.
TABLE 1. ISL61851EVAL1Z TEST POINT ASSIGNMENTS
TP NAME
OUT2
OUT1
GND
FLT2
FLT1
EN1
EN2
V+
IN
/10
Ω
load current passing through each
Eval Board and IC Gnd
Eval Board and IC Bias
Enable Switch 1
Enable Switch 2
Switch 2 Fault
Switch Out 2
Switch Out 1
Switch 1 Fault
16
DESCRIPTION
ISL6185
ISL6185
Application Considerations
The application considerations for the ISL6185 family are
widely accepted best industry practices. Good decoupling
practices on the VIN pin must be followed with placement
close to the IC with at least 2.2µF being recommended.
Work to reduce the input and output inductance to the
ISL6185 with good PCB layout practices.
When designing with the 1.5A and 1.8A versions in an
implementation where the output may be unloaded
(open) while the ISL6185 is turned on, a minimum of
4.7µF of capacitive output load is recommended to
prevent high dv/dt from unnecessarily activating the
surge/ESD control circuit.
The ISL6185 provides several continuous current rated
devices specified at V
and 1.8A options capable over the entire temperature
extreme. At V
degraded and the ISL6185 is specified at 0.6A, 1.1A,
1.3A and 1.5A respectively. At V
min specifications but a typical value is provided for
+25°C operation in the specification table. This degraded
capability is due to the higher r
at the lower bias voltage.
The enhanced thermal characteristics and increased
number of bond wires allows the 10 Ld DFN to have a
higher current capability than either the 8 Ld SOIC or
DFN.
TABLE 2. ISL6185XEVAL1Z BOARD COMPONENT
DESIGNATOR
COMPONENT
R3 - R4
R1 - R2
C2 - C3
U1
C1
LISTING
IN
= 3.3V the current capability is
ISL6185
Output Load
Resistors
FLT Output pull
up resistor
Decoupling
Capacitor
Load Capacitor
COMPONENT
FUNCTION
IN
= 5V, these are 0.6A, 1.1A, 1.5A
DS(ON)
IN
Intersil, ISL6185
10Ω, 5%, 3W
10kΩ, 0805
2.2µF, 0805
10µF 16V Electrolytic,
Radial Lead
= 2.5V there are no
DESCRIPTION
of the FET switch
COMPONENT
October 22, 2010
FN6937.0