TPS51217_15 Datasheet, PDF (6/29 Pages) Texas Instruments – HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY

TPS51217
SLUS947B – JUNE 2009 – REVISED APRIL 2012
FUNCTIONAL BLOCK DIAGRAM
0.2V/0.15V
TRAN
+/-3.8 mA
Delay
Auto-skip / FCCM
1.88 V
0.21 V/0.16 V
0.6 V - 30% +
-
+
0.6 V + 20% -
UV
0.6V + 10%/15% +
-
OV
+
0.6V - 5%/10% -
EN
VFB
TRIP
Ramp
Comp
-
Enable /
Softstart
Control
+ PWM
+
0.6V
10 mA
X (-1/8)
+
OCP
-
X 1/8
FCCM
Auto-skip
+
ZC
-
Control Logic
Delay
XCON
Ton One -Shot
Auto-skip / FCCM
TPS51217
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PGOOD
VBST
DRVH
SW
V5IN
DRVL
GND
6
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