Freescale Semiconductor
Advance Information
Document Number: MC33730
Rev. 5.0, 7/2009
Switch Mode Power Supply with
Multiple Linear Regulators
The 33730 is a multiple output power supply integrated circuit for
automotive applications. The integrated circuit (IC) incorporates a
switching regulator which operates over a wide input voltage range
from +4.5V to +26.5V.
The step-down switching regulator uses a fixed frequency PWM
voltage mode control. It has a 3.5A current limit (typical) and the slew-
rate is adjustable via a control pin to reduce switching noise. The
switching regulator has an adjustable frequency oscillator, which
allows the user to optimize its operation over a wide range of input
voltages and component values.
The linear regulators can be configured either as two normal mode
regulators (V
DD3
, V
DDL
) and one standby regulator (V
KAM
), or as one
normal mode linear regulator (V
DDL
) and two standby regulators (V
KAM
and V
DD3
Standby). Two protected outputs [VREF (1, 2)] are used to
provide power to external sensors.
Features
33730
SWITCHING POWER SUPPLY
EK SUFFIX (PB-FREE)
98ARL10543D
32-LEAD SOICW-EP
• Provides all regulated voltages for Freescale 32-bit
ORDERING INFORMATION
microcontroller family
• Adjustable frequency switching buck regulator with slew-rate
Temperature
Package
Device
control
Range (T
A
)
• Power sequencing provided
MCZ33730EK/R2
- 40°C to 125°C
32-SOICW-EP
• Programmable voltages V
DDL
, V
DD3
- 3% accuracy
• Programmable standby regulator V
KAM
- 15% accuracy,
operating down to 4.5V at KA_VBAT pin
• V
DD3
can be programmed as an optional second standby regulator with 15% accuracy
• Provides two 5.0V protected supplies for sensors
• Provides reverse battery protection FET gate drive
• Provides necessary MCU monitoring and fail-safe support
• Pb-free packaging designated by suffix code EK
33730
+
+
VBAT
PFD
KA_VBAT
VIGN
IGN_ON
BOOT
SW
VDDH
INV
VCOMP
VDD3_B
VDD3
VDDL_B
VDDL
VKAM
RSTs
REGON
+
5.0V
3.3V
(32 Bit)
5.0 V
+
VREF1,2
P1
P2
P3
CP
GND
HRT
MCU
1.5V
KA_1.0V
5.0V
Figure 1. 33730 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2009. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
