MAX14653 Datasheet, PDF (9/11 Pages) Maxim Integrated Products – High-Current Overvoltage Protector with Adjustable OVLO

MAX14653/MAX14654/
MAX14655
High-Current Overvoltage Protector
with Adjustable OVLO
Applications Information
IN Bypass Capacitor
For most applications, bypass IN to GND with a 0.1µF
ceramic capacitor as close as possible to the device. If
the power source has significant inductance due to long
lead length, the device clamps the overshoot due to LC
tank circuit.
RC
R_D
1MΩ
1.5kΩ
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 2a. Human Body ESD Test Model
IP 100%
90%
AMPERES
36.8%
10%
0
0 _tRL
IR
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
TIME
t_DL
CURRENT WAVEFORM
OUT Output Capacitor
The slow turn-on time provides a soft-start function that
allows the MAX14653/MAX14654/MAX14655 to charge
an output capacitor up to 1000µF without turning off due
to an overcurrent condition.
External OVLO Adjustment Functionality
If OVLO is connected to ground, the internal OVLO com-
parator uses the internally set OVLO value.
If an external resistor-divider is connected to OVLO
and V_OVLO exceeds the OVLO select voltage, V_{OVLO_}
SELECT^{, the internal OVLO comparator reads the IN}
fraction fixed by the external resistor divider. R₁ = 1MΩ is
a good starting value for minimum current consumption.
Since V_{IN_OVLO}, V_{OVLO_THRESH}, and R₁ are known,
R₂ can be calculated from the following formula:
V_IN= _{_OVLO}
V_{OVLO_TH}
×

^{1 +}

R₁
R₂



This external resistor-divider is completely independent
from the internal resistor-divider.
ESD Test Conditions
ESD performance depends on a number of conditions.
The MAX14653–MAX14655 are specified for ±2kV HBM
typical ESD on all pins, Contact and Air-Gap Discharge
on pin IN. Contact Maxim for a reliability report that docu-
ments test setup, test methodology, and test results.
HBM ESD Protection
Figure 2a shows the Human Body Model, and Figure 2b
shows the current waveform it generates when discharged
into low impedance. This model consists of a 100pF
capacitor charged to the ESD voltage of interest, which is
then discharged into the device through a 1.5kΩ resistor.
Figure 2b. Human Body Current Waveform
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