INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VPUMP
PGND
PUMP
MAIN
CHARGE
PUMP
OSCILLATOR
VPWR
5.0 V
REG.
VDD
VLS
REG.
VSUP
TRICKLE
HOLD
CHARGE
-OFF
PUMP
CIRCUIT
VLS
VDD
UV
DETECT
3X
RST
INT
T-LIM
PX_BOOT
DESAT. 1.4 V
COMP
EN1
EN2
PX_HS
PX_LS
3
3
CONTROL
LOGIC
+
-
V SU P
+
-
HIGH
SIDE
DRIVER
PX_HS_G
CS
PX_HS_S
SI
SCLK
SO
PHASEX
3
+
-
PHASE
COMP.
V SU P
LOW
SIDE
DRIVER
PX_LS_G
OC_OUT
+
-
+
-
GND(2)
OVER-CUR.
COMP.
I-SENSE
AMP.
PX_LS_S
VSS OC_TH AMP_OUT
AMP_N
AMP_P
VLS_CAP
Figure 2. 33937A Simplified Internal Block Diagram
33937A
Analog Integrated Circuit Device Data
2
Freescale Semiconductor
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