Specifications

OUT
VS
VBAT
RCL
Iout/Kcl
Iout
Rcs
CL
CS
Iout/K
CURRENT
CLAMP
Vcl,th
FAULT
Vcs,H
+
t
ADC Full Scale
Range
Max Normal
Operating Current
On-state: Current limit, thermal fault
Off-state: Open load/ short to battery
Over
current
Normal
Open Load Current
On-state:
open load/short to battery
Current Sense
Voltage
Operating
Range
Vcs,H
TPS1H100-Q1
SLVSCM2A –OCTOBER 2014–REVISED JANUARY 2014 www.ti.com
Feature Description (continued)
Figure 30. Current Sense Pin Voltage Indication
Figure 31. Current Sense and Current Limit Block Diagram
8.3.2 Programmable Current Limit
A high-accuracy current limit allows higher reliability, which protects the power supply during short circuit or
power-up. Also, it can save system costs, by reducing PCB traces, connector size, and the preceding stage
power capacity.
Current limit offers the protection to the load and integrated power FET from over stressing. It holds at the set
value, and pulls up the CS pin to V
CS,h
as a diagnostic report. The two current limit thresholds are:
• External programmable current limit -- An external resistor is used to convert a proportional load current into a
voltage, which is compared with an internal reference voltage, V
th,cl
. When the voltage on the CL pin exceeds
V
th.cl
, a closed loop steps in immediately. V
GS
voltage regulates accordingly, leading to the V
ds
voltage
regulation. When the closed loop is set up, the current is clamped at the set value finally. The external
programmable current limit enhances the flexibility to set the current limit value by application.
• Internal current limit -- Internal current limit is fixed and typically 10 A. To use internal current limit for large
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