MC33997 Datasheet, PDF (2/20 Pages) Motorola, Inc – Switching Power Supply with Linear Regulators

Freescale Semiconductor, Inc.
VPW _R
KA_VPW _R
5.0 V ^VRE F1
5.0 V ^VRE F2
339 97
I -lim
D r iv e
S oft
Start
Enb
O sc
Logic
&
Latch
Ramp
V _bg
Retry
VREF1
Reg.
B andgap
Voltage
Vbg
S nsenb Reference
Retry
VREF2
Reg.
Sns e nb
Sn senb
En able
Co ntrol _{E nb}
Enb
3.3V
Lin ear
Re gulat or
D r i ver
POR
Enb
Vbg
3.3V
S ta ndb y
R eg .
Charge
Pump
PwrOK
Vk am OK
VSW
5.0 V
FBKB
VSUM
VDD _H
DR VL
FBL
3.3 V
V _KAM
3.3 V
PWROK
VKAMOK
CR _ES
SNSEN
EN
GND
Figure 1. 33997 Simplified Block Diagram
33997
2
For More Information O^Mn^OTT^Oh^Ri^Os^LAPr^Ao^Nd^ALu^Oc^Gt,^{INTEGRATED CIRCUIT DEVICE DATA}
Go to: www.freescale.com