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參數(shù)資料
| 型號： | MC33998 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Switching Power Supply with Linear Regulators(帶線性穩(wěn)壓器的開關(guān)電源) |
| 中文描述： | 開關(guān)電源與線性穩(wěn)壓器（帶線性穩(wěn)壓器的開關(guān)電源） |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 437K |
| 代理商： | MC33998 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33998
3
PIN FUNCTION DESCRIPTION
Pin
Pin Name
Description
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
, V
DDH
, or V
DDL
. When either V
DDH
or V
DDL
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 V
DDH
. 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 V
DDL
(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.
V
KAM
EN
SNSEN
V
REF1
GND
GND
GND
GND
V
REF2
V
DDH
FBL
DRVL
VKAMOK
KA_V
PWR
C
RES
V
PWR
GND
GND
GND
GND
V
SW
PWROK
FBKB
V
SUM
5
6
7
8
9
10
11
12
2
3
4
24
20
19
18
17
16
15
13
23
22
21
14
1
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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