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