MAX4893BETB+T Maxim Integrated Products, MAX4893BETB+T Datasheet - Page 9

• Manufacturer Part Number: MAX4893BETB+T
• Description: IC CTLR OVP CURR LIMIT 10-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX4893BETB+T

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 7a. MAX4881/MAX4882/MAX4883B/MAX4884B/
MAX4893B Functional Diagram
resets if the overcurrent condition disappears before
t
the overcurrent condition continues up to the end of the
blanking time (MAX4881/MAX4882/MAX4883B/
MAX4884B/MAX4893B). The MAX4883C/MAX4884C limit
the current infinitely until the thermal trip point occurs.
Reset the switch by toggling EN or CB or IN (Figure 6).
The MAX4881–MAX4884/MAX4893B feature an active-
low enable input (EN). Drive EN low or connect to
ground for normal operation. Drive EN high to force the
external n-channel MOSFET off, and to disable OV and
FLAGI.
An on-chip charge pump drives the GATE voltage to
about twice above V
n-channel MOSFET (Figure 7). The actual GATE output
voltage tracks approximately 2 x V
the OVLO trip level, 5.6V (MAX4881/MAX4883/
MAX4893B) and 4.5V (MAX4882/MAX4884) typically.
BLANK
FLAGI
OV
IN
has elapsed. The internal switch is latched off if
I
REF
OVLO
UVLO
AND LATCHOFF LOGIC
IN
EN
BLANKING TIME
_______________________________________________________________________________________
1.1A/0.7A
Overvoltage Protection Controllers with
CHARGE
PUMP
LIMIT
IN
, allowing the use of a low-cost
GND
CHARGE PUMP
MAX4883B/MAX4884B
MAX4881/MAX4882
GATE
IN
MAX4893B
until V
GATE Driver
UVLO
BTA
IN
EN Input
exceeds
BTA
BTB
CB
The GATE output voltage, as a function of input volt-
age, is shown in the Typical Operating Characteristics.
The MAX4881–MAX4884/MAX4893B are designed for
use with an n-channel MOSFET. MOSFETs with R
specified for a V
supply is near the UVLO minimum of 4.2V (MAX4881/
MAX4883/MAX4893B), or of 2.4V (MAX4882/ MAX4884),
consider using a MOSFET specified for a lower V
age. Also, the V
withstand the full 28V IN range of the MAX4881–
MAX4884/MAX4893B. Table 1 shows a selection of
MOSFETs appropriate for use with the MAX4881–
MAX4884/MAX4893B.
Bypass IN to GND with a 1µF ceramic capacitor to
achieve 15kV ESD-protected input. When the power
source has significant inductance due to long lead
Figure 7b. MAX4883C/MAX4884C Functional Diagram
FLAGI
Current Limit in TDFN
OV
IN
I
REF
OVLO
UVLO
IN
EN
Applications Information
GS
DS
BLANKING TIME
1.1A/0.7A
CHARGE
of 4.5V or less, work well. If the input
PUMP
LIMIT
LOGIC
should be 30V for the MOSFET to
IN Bypass Considerations
GND
CHARGE PUMP
MAX4883C/MAX4884C
MOSFET Selection
GATE
UVLO
BTA
GS
DS(ON)
volt-
BTA
BTB
CB
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