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MC33998 Datenblatt(PDF) 3 Page - Freescale Semiconductor, Inc

Teilenummer MC33998
Bauteilbeschribung  Switching Power Supply with Linear Regulators
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Hersteller  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC33998 Datenblatt(HTML) 3 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
3
Freescale Semiconductor
33998
PIN CONNECTIONS
PIN CONNECTIONS
Figure 3. 33998 Pin Connections
Table 1. Pin Definitions
Pin Number
Pin
Name
Definition
1
VKAMOK
Keep-Alive Output Monitoring. This pin is an "open-drain" output that will be used with a discrete pull-up
resistor to V
KAM. When the supply voltage to the 33998 is disconnected or lost, the VKAMOK signal goes
low.
2
KA_V
PWR
Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections
and ignition switch activated connections.
3
C
RES
Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump.
4
V
PWR
Power Supply Pin. Main power input to the IC. This pin is directly connected to the switching regulator
power MOSFET. In automotive applications this pin must be protected against reverse battery conditions
by an external diode.
5–8
GND
Ground of the integrated circuit.
9
V
SW
Internal P-Channel Power MOSFET Drain. V
SW is the "switching node" of the voltage buck converter. This
pin is connected to the V
PWR pin by an integrated p-channel MOSFET.
10
PWROK
Power OK Reset Pin. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to
V
KAM, VDDH, or VDDL. When either VDDH or VDDL output voltage goes out of the regulation limits this
pin is pulled down.
11
FBKB
Step-Down Switching Regulator Feedback Pin. The FBKB pin is the V
DDH feedback signal for the
switching regulator.
12
V
SUM
Error Amplifier "Summing Node". The V
SUM pin is connected to the inverting input of the error amplifier.
This node is also the "common" point of the integrated feedback resistor divider.
13
DRVL
Drive for V
DDL (2.6 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the
V
DDL linear post regulator. The collector of the VDDL pass transistor is connected to VDDH. An example
of a suitable pass transistor is BCP68.
14
FBL
Feedback for V
DDL (2.6 V) Regulator. The FBL pin is the voltage feedback sense signal from the VDDL
(2.6 V) linear post regulator.
15
V
DDH
V
DDH is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the
2.6 V linear power regulator. The V
DDH pin is supplied from the switching regulator output, capable of
providing 5.0 V @ 1400 mA total output current.
16
V
REF2
Sensor Supply #2 Output. The V
REF2 pin is sensor supply output #2.
17–20
GND
Ground of the integrated circuit.
21
V
REF1
Sensor Supply #1 Output. The V
REF1 pin is sensor supply output #1.
VKAM
GND
GND
GND
GND
VREF2
VDDH
FBL
DRVL
EN
SNSEN
VREF1
VKAMOK
GND
GND
GND
GND
VSW
PWROK
VSUM
KA_VPWR
CRES
VPWR
FBKB
5
6
7
8
9
10
11
12
2
3
4
24
20
19
18
17
16
15
13
23
22
21
14
1


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