Datasheet

TPS54262-Q1
SLVS996C –SEPTEMBER 2009–REVISED JUNE 2010 www.ti.com
5) Hysteretic Mode
The device enters in this mode of operation when the main loop fails to respond during line/ load transients and
regulate within specified tolerances. The device exits this mode of operation when the main control loop
responds, after the error amplifier stabilizes, and controls the output voltage within tighter tolerance.
The power up conditions in different modes of operations are explained in Table 4.
Table 4. Power-Up Conditions
MODE OF OPERATION POWER-UP CONDITIONS
CCM VIN > 3.6 V (minimum)
LPM/DCM V
Reg
< 5.5 V and (VIN - V
Reg
) > 2.5 V (applicable only for f
sw
> 600 kHz)
Output Tolerances in Different Modes of Operation
Figure 22.
Table 5.
MODE OF OPERATION V
Reg
LOWER LIMIT V
Reg
UPPER LIMIT COMMENTS
Hysteretic mode VReg_UV VReg_OV Minimum to maximum ripple on output
Low-power mode VReg_UV V
Reg
+ tol
VReg
Minimum to maximum ripple on output
Active mode (Normal) V
Reg
– tol
VReg
V
Reg
+ tol
VReg
Minimum to maximum ripple on output
Table 6.
SUPERVISOR V
Reg
TYPICAL TOLERANCE COMMENTS
THRESHOLDS VALUE
VReg_OV Overvoltage threshold setting
VReg_RST Reset threshold setting
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