TLF50241EL_15 Datasheet, PDF (10/30 Pages) Marl International Limited – 2.2 MHz Step-Down Regulator 500 mA, 5 V, low quiescent current

TLF50241EL
Buck Regulator
Input undervoltage shutdown: If the input voltage is below the input undervoltage shutdown threshold V_S,off the
device will shut down.
Output overvoltage protection: if the output voltage exceeds the PFM threshold the device will switch from PWM
to PFM. Pulses will then be generated only depending on the value of the output voltage V_CC.
Soft start function: an integrated soft start function of duration t_start ensures, that the inrush current will be limited.
After an over-temperature shutdown the regulator always restarts with a soft start.
Over-temperature shutdown: an internal temperature sensor detects the temperature of the device. It will be
switched off if the junction temperature exceeds the over temperature shutdown threshold T_j,sd and restart with a
certain hysteresis T_{j,sd_hyst} (for details please refer to Chapter 7, Thermal Shutdown).
Biasing:
The internal biasing is taken from pin VS as well as from pin FB (connected to V_CC) (for details please refer to
Chapter 7, Thermal Shutdown). Thus the power consumption from the supply voltage V_S can be minimized.
VS
FB
SYNC_IN
FREQ
VBG
PFM
Comparator
-
-
EA-gmV
CS-gmI
PWM Comp
PWM
PFM
Logic
GateD
Driver
Clock
Manager
CK_A SoftStart
Slope
Comp.
CLK
SWO
Figure 3 Block Diagram Buck Regulator
GND
Data Sheet
10
Rev. 1.0, 2013-06-19