ETC MC33998

带线性调压器的开关电源芯片 MC33998
-67-
·元器件卡片
带钱'除铺系器伪什美~~乐总片 MC33998
曾洁
(大连铁道学院电信分院，辽宁大连
116028)
GND: 芯片地。
1 MC33998 的主要特点
V 5W :内部 P 沟道 MOSFET 的漏极。
用于车辆控制以及航空航天等高技术领域的
MPC双X 系列高档微处理器的工作频率往往较高，
PWROK: 电源 OK 复位端。此端在 V DDII、 V皿电
压超出其调节范围后变低。
数据吞吐量大，数据处理速度要求快，系统功耗相对
FBKB: 降压开关调节器反馈端 O
较高，而且系统往往需在高速移动、条件苛刻和剧烈
V酬:误差放大器"求和节点"。
变化的环境下运行，因而要求系统具有高可靠性、安
DRVL: 驱动输出端，用于驱动外部 NPN 旁路晶
全性和较强的机电结合性。所有这些都与系统的电
体管的基极。
源质量有着直接的关系。因此，高效、高性能的电源
FBL: V DDL(2. 6V)电压调节器的反馈输出端。
系统对 M配5XX和 MC683XX 系列等高档微处理器
V DDII : 传感器电路和 2. 6V线性待机电压调节器
系统而言都尤为重要。本文介绍一种由 MOTOROLA
驱动电路的电源输入端。
半导体公司专门为 M配立X 和 MV683XX 系列高档
V REF2 :传感器参考电压输出端 2。
微处理器设计的电源管理模块 MC33998 ，这是一种
V阻Fl: 传感器参考电压输出端 1 。
带有线性调节器的高性能开关电源管理芯片。其主
SNSEN: 传感器供电使能端，高电平有效，当此
管脚为低电平时，传感器电源关闭。
要特性如下:
EN: 主开关电压调节器使能端，高电平着效，当
·工作范围从6v - 26. 5V(瞬间可高达4OV);
·降压开关调节器输出电压 V DDII为 5.0V ，能输
此管脚为低电平时，电源处于低功耗状态。
出 14仙nA电流;
VKAM :
·带外部旁路晶体管的线性电压调节器的输出
电压 V DDL为 2. 啊，可输出 4仙nA电流;
·低功率待机线性电压调节器输出电压 V KAM 为
存储器的供电需求。
3
内部结构及外围设计
MC33998 是一个中功率、多输出的电源集成电
2. 啊，可输出 1伽tA电流;
。
2. 6V待机电压调节器输出端，用以维持
·具有电源和短路保护功能:
路，其内部由5v开关电压调节器、 2. 的线性电压调
·带有欠压关闭和再复位功能;
节器、传感器供电电压调节器、待机电压调节器、上
·具有上电延时功能;
电复位定时器、输出电压监视器、电源输出控制等部
·可分别在能主电源输出和传感器电源输出。-
2
引脚功能
~SNSEN
MC33998 采用 24 脚宽体 SOIC 封装。管脚排列
如图 1 所示，各引脚功能如下:
VKAMOK: 电源监视端，当 MC33998 的电源断开
或丢失时， VKAMOK 引脚信号变低。
ll!l GND
ill GND
ü1 GND
mVREF2
缸-VP\VR:电源输入端。
:rn VDDH
j] FBL
C RES ; 储能电容器连接端。
V PWR : 供电输入端，可直接连接到开关电压调节
器的 MOSFET o
MC33998
.l
可 DRVL
图 1 MC33998 的音脚排列
.
-68-
{ti 外~~乱 a 件 )2α)4年第 9 期
2(则4 年 9 月
MC3 3998
-+
图 2
,
MC339饨的内部结构框图及外围电路设计
分组成。其工作电压范围为6v - 26. 贺，瞬间电压可
..
连接电路。
达 40V 。它采用非电流敏感模式控制的方法降压，可
有些高档微控制器可能含有各种电压调节器，
将开关电压调节器输出直接调至5V o 2. 6V线性电
但 MPC5XX等高档微处理器系统一般工作负荷较
压调节器可通过一个外部的旁路晶体管来减小
大，内置式电压调节器不利于微处理器的散热。因
MC33998 的功耗。 MC33998 不但可为系统提供贺电
此，由专门的电源模块为 MPC5XX控制系统供电，可
源，而且还具有 2. 6V的待机电压调节器和两个传
以大大提高系统的安全性、可靠性与稳定性。
感器5v供电输出，并且这两个5v输出均可通过芯
收稿日期 :2∞4-02-27
片内部低阻抗 LDMOS 晶体管得到保护。该芯片主电
咨询编号 :04佣23
源输出和传感器供电输出分别受两个独立的使能端
KA_ VPWR
控制，而且对电源的输出还具有监视功能。其内部
VPWR
结构及外围电路设计如图 2 所示。
4
应用电路
T
VDDH
寺亨
亨川V ←....，.-I VREF
DRVL
FBL
MC33998 的开关电压调节器是一个传统的高频
(7弧Hz)逆变换器，它内含 P 掏道功率 MOS阳r。其
Vsw
MC33998
VRÈF2
5.0V
个
唁F"
VKAM
输出电压 V DDH 被调节在 5 土 O.IV ，总输出电流为
14仙础，可为 ECU( 电子控制模块)的数字和模拟电
路提供电源。图 2 同时给出了 MC33998 的典型外围
电路连接方式;图 3 所示是 MC33朔与常处理器的
图 3
MC33998 与 MCU 的连接
.
VKAM
Freescale Semiconductor, Inc.
MOTOROLA
Document order number: MC33998/D
Rev 1.0, 03/2003
SEMICONDUCTOR TECHNICAL DATA
Advance Information
33998
Freescale Semiconductor, Inc...
Switching Power Supply with Linear
Regulators
The 33998 is a medium-power, multi-output power supply integrated circuit
that is capable of operating over a wide input voltage range, from 6.0 V up to
26.5 V with 40 V transient capability. It incorporates a sensorless current
mode control step-down switching controller regulating directly to 5.0 V. The
2.6 V linear regulator uses an external pass transistor to reduce the 33998
power dissipation. The 33998 also provides a 2.6 V linear standby regulator
and two 5.0 V sensor supply outputs protected by internal low-resistance
LDMOS transistors.
POWER SUPPLY
INTEGRATED CIRCUIT
There are two separate enable pins for the main and sensor supply outputs
and standard supervisory functions such as resets with power-up reset delay.
The 33998 provides proper power supply sequencing for advanced
microprocessor architectures such as the Motorola MPC5xx and 683xx
microprocessor families.
Features
• Operating Voltage Range 6.0 V up to 26.5 V (40 V transient)
• Step-Down Switching Regulator Output VDDH = 5.0 V @ 1400 mA (total)
• Linear Regulator with External Pass Transistor VDDL = 2.6 V @ 400 mA
• Low-Power Standby Linear Regulator VKAM = 2.6 V @ 10 mA
• Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected Against
Short-to-Battery and Short-to-Ground with Retry Capability
• Undervoltage Shutdown on the VDDL, VDDH Outputs with Retry Capability
• Reset Signals
• Power-Up Delay
• Enable Pins for Main Supplies (EN) and Sensor Supplies (SNSEN)
• Power Sequencing for Advanced Microprocessor Architectures
• SOIC-24WB Package
DW SUFFIX
24-LEAD SOICW
CASE 751E
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33998DW/R2
-40°C to 125°C
24 SOICW
33998 Simplified Application Diagram
33998
KA_VPW R VSW
VDDH
5.0 V
VPW R
VDDH
5.0 V
VREF1
5.0 V
VREF2
MCU
DRVL
FBL
VKAM
EN
VDDL
VKAM
SNSEN
GND
PWROK
VKAMOK
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2003
For More Information On This Product,
Go to: www.freescale.com
2.6 V
2.6 V
Freescale Semiconductor, Inc.
339 98
VPW R
VSW
Drive
I -lim
S oft
Start
5.0 V
Ramp
FBKB
Logic
&
Latch
Enb
VSUM
O sc
V bg
KA_VPW R
Freescale Semiconductor, Inc...
VDDH
Retry
V REF1
B andgap
Voltage
S nsenb Reference
V bg
2.6V
Lin ear
Re gulat or
Driver
Enb
Reg.
5.0 V
FBL
2.6 V
V KAM
2.6 V
VRE F1
Enb
Retry
POR
Sns enb
V REF2
Reg.
5.0 V
DRVL
V bg
2. 6V
Standby
Reg.
Sn senb
En able
Co ntrol
PWROK
E nb
VRE F2
VKAMOK
PwrOK
Charge
Pump
CRES
SNSEN
EN
Vk amOK
PGND
Figure 1. 33998 Simplified Block Diagram
33998
2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On
This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
VKAMOK
KA_VPWR
CRES
VPWR
GND
GND
GND
GND
VSW
PWROK
FBKB
VSUM
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
VKAM
EN
SNSEN
VREF1
GND
GND
GND
GND
VREF2
VDDH
FBL
DRVL
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 VKAM. When the supply voltage to the 33998 is disconnected or lost, the VKAMOK signal goes low.
2
KA_VPWR
Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections and
ignition switch activated connections.
3
CRES
Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump.
4
VPWR
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
VSW
Internal P-Channel Power MOSFET Drain. VSW is the "switching node" of the voltage buck converter. This pin
is connected to the VPWR 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
VKAM, 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 VDDH feedback signal for the switching
regulator.
12
VSUM
Error Amplifier "Summing Node". The VSUM 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 VDDL (2.6 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the
VDDL 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 VDDL (2.6 V) Regulator. The FBL pin is the voltage feedback sense signal from the VDDL (2.6 V)
linear post regulator.
15
VDDH
VDDH 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 VDDH pin is supplied from the switching regulator output, capable of providing 5.0 V
@ 1400 mA total output current.
16
VREF2
Sensor Supply #2 Output. The VREF2 pin is sensor supply output #2.
17–20
GND
21
VREF1
Ground of the integrated circuit.
Sensor Supply #1 Output. The VREF1 pin is sensor supply output #1.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On This Product,
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33998
3
Freescale Semiconductor, Inc.
PIN FUNCTION DESCRIPTION (continued)
Pin Name
22
SNSEN
23
EN
24
VKAM
Description
Sensor Supply Enable Input. The SNSEN pin is an input, which enables the VREF1 and VREF2 supplies. It
allows the control module hardware/software to shut down the sensor supplies.
Enable Input. The EN pin is an input, which enables the main switching regulator and all other functions. When
this pin is low, the power supply is in a low quiescent state.
Keep-Alive (standby) 2.6 V Regulator Output. This is a 2.6 V low quiescent, low dropout regulator for Keep
Alive memory.
Freescale Semiconductor, Inc...
Pin
33998
4
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On
This Product,
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Freescale Semiconductor, Inc.
MAXIMUM RATINGS
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Value
Unit
VPWR
-0.3 to 45
V
KA_VPWR
-0.3 to 45
V
Switching Node
VSW
-0.5 to 45
V
5.0 V Input Power
VDDH
-0.3 to 6.0
V
Sensor Supply
VREF1
-0.3 to 18
V
VREF2
-0.3 to 18
VKAM
-0.3 to 6.0
V
EN
-0.3 to 6.0
V
Main Supply Voltage
Keep-Alive Supply Voltage
Freescale Semiconductor, Inc...
Keep-Alive Supply Voltage
Maximum Voltage at Logic I/O Pins
SNSEN
-0.3 to 6.0
PWROK
-0.3 to 6.0
VKAMOK
-0.3 to 6.0
Charge Pump Reservoir Capacitor Voltage
CRES
-0.3 to 18
V
Error Amplifier Summing Node
VSUM
-0.3 to 6.0
V
Switching Regulator Output Feedback
FBKB
-0.3 to 6.0
V
VDDL Base Drive
DRVL
-0.3 to 6.0
V
VDDL Feedback
FBL
-0.3 to 6.0
V
Human Body Model (all pins) (Note 1)
VESD1
±500
Machine Model (all pins) (Note 2)
VESD2
±100
Power Dissipation (TA = 25°C) (Note 3)
PD
800
mW
Thermal Resistance, Junction to Ambient (Note 4), (Note 5)
RθJ-A
60
°C/W
Thermal Resistance, Junction to Board (Note 6)
RθJ-B
20
°C/W
Operational Package Temperature [Ambient Temperature] (Note 7)
TA
-40 to 125
°C
Operational Junction Temperature
TJ
-40 to 150
°C
TSTG
-55 to 150
°C
TS
260
°C
V
ESD Voltage
Storage Temperature
Lead Soldering Temperature (Note 8)
Notes
1. ESD1 testing is performed in accordance with the Human Body Model (CZAP =100 pF, RZAP =1500 Ω).
2.
ESD2 testing is performed in accordance with the Machine Model (CZAP =200 pF, RZAP =0 Ω)
3.
4.
Maximum power dissipation at indicated junction temperature.
Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board) temperature, ambient
temperature, air flow, power dissipation of other components on the board, and board thermal resistance.
Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal.
Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on the top surface
of the board near the package.
The limiting factor is junction temperature, taking into account the power dissipation, thermal resistance, and heat sinking.
Lead soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
5.
6.
7.
8.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On This Product,
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33998
5
Freescale Semiconductor, Inc.
STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see
Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Normal Operating Voltage Range (Note 9)
VPWR(N)
6.0
–
18
Extended Operating Voltage Range (Note 9)
VPWR(E)
18
–
26.5
Maximum Transient Voltage - Load Dump (Note 10)
VPWR(LD)
–
–
40
Unit
GENERAL
V
Supply Voltage Range
IVPWR
Freescale Semiconductor, Inc...
VPWR Supply Current
EN = 5.0 V, VPWR = 14 V, No Loads
mA
25
–
150
5.0
–
15
0.5
–
3.0
µA
IQ_VPWR
VPWR Quiescent Supply Current
EN = 0 V, VPWR = 12 V
IKAVPWR
KA_VPWR Supply Current,
EN = 5.0 V, KA_VPWR = 14 V, No Load on VKAM
mA
µA
IQ_KAVPWR
KA_VPWR Quiescent Supply Current
EN = 0 V, KA_VPWR = 12 V
V
50
–
350
4.9
–
5.1
4.9
–
5.1
-20
–
30
-20
–
20
-20
–
20
1.0
–
15
BUCK REGULATOR VDDH
VDDH
Buck Converter Output Voltage
IVDDH = 200 mA to 1.4 A, VPWR = KA_VPWR = 14 V
V
VDDH
Buck Converter Output Voltage
IVDDH = 1.4 A, VPWR = KA_VPWR = 6.0 V
V
RegLnVDDH
VDDH Line Regulation
VPWR = KA_VPWR = 10 V to 14 V, IVDDH = 200 mA
mV
mV
VDDH Load Regulation
VPWR = KA_VPWR = 14 V, IVDDH = 200 mA to 1.4 A
RegLdVDDH
VPWR = KA_VPWR = 6.0 V, IVDDH = 200 mA to 1.4 A
Ω
RHDisch
VDDH Active Discharge Resistance
VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 10 mA
P-CHANNEL MOSFET
Drain-Source Breakdown Voltage—Not Tested (Note 11)
BVDSS
45
–
–
V
Drain-Source Current Limit—Not Tested (Note 11)
IscSW1
–
-7.0
–
A
Notes
9. VDDH is fully functional when the 33998 is operating at higher battery voltages, but these parameters are not tested. The test condition as are:
a) VDDH must be between 4.9 V and 5.1 V (200 mA to 1.4 A) for VPWR = 14 V to 18 V.
b) VDDH must be between 4.8 V and 5.5 V (200 mA to 1.4 A) for VPWR = 18 V to 26.5 V.
10.
11.
33998
6
Part can survive, but no parameters are guaranteed.
Guaranteed by design but not production tested.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On
This Product,
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Freescale Semiconductor, Inc.
STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see
Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
2.5
2.6
2.7
Unit
LINEAR REGULATOR VDDL
VDDL
VDDL Output Voltage
VPWR = KA_VPWR = 14 V, IVDDL = 200 mA
RegLnVDDL
VDDL Line Regulation
mV
-30
–
30
-70
–
70
5.0
11
25
1.0
–
10
0.6
–
10
CVDDL
–
68
–
µF
ESRVDDL
–
0.125
–
Ω
2.5
–
2.7
VPWR = KA_VPWR = 26 V, IVKAM = 0.5 mA
2.5
–
2.7
VPWR = KA_VPWR = 18 V, IVKAM = 5.0 mA
2.5
–
2.7
VPWR = KA_VPWR = 5.0 V, IVKAM = 10.0 mA
2.5
–
2.7
VPWR = 0 V, KA_VPWR = 3.5 V, IVKAM = 5.0 mA
2.0
–
2.7
-20
–
20
0
–
100
-20
–
60
CVKAM
–
4.7
–
µF
ESRVKAM
–
1.4
–
Ω
VDDH = 4.8 V to 5.2 V, IVDDL = 400 mA
Freescale Semiconductor, Inc...
V
RegLdVDDL
VDDL Load Regulation
VPWR = KA_VPWR = 14 V, IVDDL = 10 mA to 400 mA
mV
IDRVL
DRVL Output Current
VPWR = KA_VPWR = 14 V, VDRVL = 1.0 V
mA
Ω
RLDisch
VDDL Active Discharge Resistance
VPWR = KA_VPWR = 14 V, EN = 0 V, IFBL = 10 mA
Ω
RCLAMP
VDDH to VDDL Active Clamp Resistance
VPWR = KA_VPWR = 14 V, EN = 0 V, IVDDH = 50 mA, VFBKB = 0 V
VDDL Output Capacitor Capacitance (Note 12)
VDDL Output Capacitor ESR (Note 12)
KEEP-ALIVE (STANDBY) REGULATOR VKAM
VKAM
VKAM Output Voltage
IVKAM = 5.0 mA, VPWR = KA_VPWR = 18 V, EN = 5.0 V
VKAM Output Voltage, EN = 0 V (Standby Mode)
VKAM Line Regulation, EN = 0 V (Standby Mode)
VKAM
V
RegLnVKAM
VPWR = KA_VPWR = 5.0 V to 18 V, IVKAM = 2.0 mA
VKAM Load Regulation, EN = 0 V (Standby Mode)
V
mV
RegLdVKAM
VPWR = KA_VPWR = 14 V, IVKAM = 1.0 mA to 10 mA
mV
RegVKAM
Differential Voltage VKAM - VDDL
EN = 5.0 V, IVKAM = 5.0 mA, VPWR = KA_VPWR = 14 V, IVDDL = 200 mA
VKAM Output Capacitor Capacitance (Note 12)
VKAM Output Capacitor ESR (Note 12)
mV
Notes
12. Recommended value.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33998
7
Freescale Semiconductor, Inc.
STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see
Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
–
–
280
–
–
350
–
–
455
500
–
900
500
–
900
33
–
39
2.1
2.4
2.5
4.5
–
4.8
Unit
SENSOR SUPPLIES VREF1, VREF2
RDS(on)
VREF On-Resistance, TA = -40°C
IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V
RDS(on)
VREF On-Resistance, TA = +25°C
IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V
mΩ
RDS(on)
VREF On-Resistance, TA = +125°C
Freescale Semiconductor, Inc...
mΩ
IVREF = 200 mA, IVDDH = 200 mA, VPWR = KA_VPWR = 14 V, EN = 5.0 V
mΩ
ISC_Bat
VREF Short-to-Battery Detect Current
VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V
mA
ISC_Gnd
VREF Short-to-Ground Detect Current
VPWR = KA_VPWR = 14 V, EN = 5.0 V, SNSEN = 5.0 V
Maximum Output Capacitance (Total) (Note 13)
CVREF
mA
nF
SUPERVISORY CIRCUITS
PWROK Undervoltage Threshold on VDDL, FBL Ramps Down
VFBL(thL)
VPWR = KA_VPWR = 14 V, IVDDH = 200 mA
V
VDDH(thL)
PWROK Undervoltage Threshold on VDDH
VPWR = KA_VPWR = 14 V, IVDDH = 200 mA
V
VDDH(thH)
VDDH Overvoltage Threshold
VPWR = KA_VPWR = 10 V, IVDDH = 200 mA
V
5.12
–
5.7
–
–
200
2.1
2.4
2.5
Ω
RDS(on)
PWROK Open Drain On-Resistance
VPWR = KA_VPWR = 14 V, EN = 5 V, IPwrOK = 5.0 mA
VKAM(thL)
VKAMOK Threshold,
VPWR = KA_VPWR = 14 V, IVDDH = 200 mA
VKAMOK Threshold on VPWR, VPWR Ramps Up
V
VPWRok(th)
KA_VPWR = 14 V, IVDDH = 200 mA
V
4.0
–
5.0
50
–
200
Ω
RDS(on)
VKAMOK Open Drain On-Resistance
VPWR = KA_VPWR = 14 V, EN = 0 V, IVKAMOK = 10 mA
Enable Input Voltage Threshold (Pin EN)
VIH
1.0
–
2.0
V
Enable Pull-Down Current (Pin EN), EN = 1.0 V VDDH to VIL(min)
IPD
500
–
1200
nA
Sensor Enable Input Voltage Threshold (Pin SNSEN)
VIH
1.0
–
2.0
V
Sensor Enable Pull-Down Current (Pin SNSEN)
IPD
500
–
1200
SNSEN = 1.0 V VDDH to VIL(min)
nA
Notes
13. Recommended value.
33998
8
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C, using the typical application circuit (see
Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
VPWR = KA_VPWR = 14 V, IVDDH = 200 mA, ICP = 0 µA
12
–
15
VPWR = KA_VPWR = 14 V, IVDDH = 200 mA, ICP = 10 µA
12
–
15
Unit
CHARGE PUMP CRES
VCRES
V
Freescale Semiconductor, Inc...
Charge Pump Voltage
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33998
9
Freescale Semiconductor, Inc.
DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C using the typical application circuit (see
Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
Switching Frequency (Note 14)
fSW
–
750
–
kHz
Soft Start Duration (see Figure 2)
tSS
5.0
–
15
1.0
–
20
BUCK REGULATOR VDDH
VPWR = KA_VPWR = 6.0 V
ms
Freescale Semiconductor, Inc...
CHARGE PUMP CRES
tCRES
Charge Pump Current Ramp-Up Time
VPWR = KA_VPWR = 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V
ms
tCRES
Charge Pump Ramp-Up Time
ms
1.0
VPWR = KA_VPWR = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V
–
10
SENSOR SUPPLIES VREF1, VREF2
VREF Overcurrent Detection Time (see Figure 3)
µs
tDet
VREF Load RL = 5.0 Ω to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V,
EN = 5.0 V, SNSEN = 5.0 V
0.5
–
2.0
tRet
VREF Retry Timer Delay (see Figure 3)
VREF Load RL = 5.0 Ω to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V,
EN = 5.0 V, SNSEN = 5.0 V
ms
5.0
–
20
SUPERVISORY CIRCUITS
PWROK Delay Time (Power-On Reset) (see Figure 4)
tD(PWROK)
5.0
–
15
ms
VKAMOK Delay Time (see Figure 5)
tD(VKAMOK)
10
–
30
ms
VDDH Power-Up Delay Time (see Figure 6)
tD(VPWR)
1.0
–
10
ms
Fault-Off Timer Delay Time (see Figure 7)
tFault
1.0
–
10
ms
Notes
14. Guaranteed by design but not production tested.
33998
10
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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VPWR (V)
KA_VPW R
(V)
Timing Diagrams
EN (V)
6.0
0
5.0
0
2.5V
5.0
4.8V
0
TIME
Figure 2. Soft-Start Time
0
5.0
tDet
0
5.0
??V
??V
4.8V
2.0V
2.0V
0
t Ret
PWROK
(V)
V REF (V)
VPWR
SNSEN
KA_VPWR
EN (V)
(V)
14
2.6
0
TIME
V DDH (V)
EN (V)
VPWR (V)
KA_VPWR
(V)
Figure 3. VREF Retry Timer
14
0
5.0
0
5.0
4.6V
tD(PWROK)
0
PWROK
(V)
Freescale Semiconductor, Inc...
VDDH (V)
t SS
2.6
0
TIME
Figure 4. PWROK Delay Timer (Power-On Reset)
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33998
11
Freescale Semiconductor, Inc.
KA_VPWR
(V)
0
EN (V)
Timing Diagrams (continued)
0
Freescale Semiconductor, Inc...
VKAMOK (V)
V KAM (V)
6.0
VPW R = 0V
5.0
2.6
2.4V
tD(VKAMOK)
0
2.6
0
TIME
18
EN (V)
5.0
VPWR (V)
0
18
VDDH (V)
KA_VPW R
(V)
Figure 5. VKAMOK Delay Time
5.0
0
t D(VPWR)
0
2.0V
0
TIME
VPWR
KA_V PWR
EN (V)
(V)
Figure 6. VDDH Power-Up Delay Time
(V)
VDDH (V)
V DDL
14
0
5.0
0
2.6
0
5.0
4.7V
4.7V
1.0V
1.0V
0
tFault
PW ROK
(V)
tFault
2.6
0
TIME
Figure 7. Fault-Off Timer Delay Time
33998
12
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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SYSTEM/APPLICATION INFORMATION
INTRODUCTION
The 33998 multi-output power supply integrated circuit is
capable of operating from 6.0 V up to 26.5 V with 40 V transient
capability. It incorporates a step-down switching controller
regulating directly to 5.0 V. The 2.6 V linear regulator uses an
external pass transistor, thus reducing the power dissipation of
the integrated circuit. The 33998 also provides a 2.6 V linear
standby regulator and two 5.0 V sensor supply outputs
protected by internal low-resistance LDMOS transistors
against short-to-battery and short-to-ground.
FUNCTIONAL PIN DESCRIPTION
Freescale Semiconductor, Inc...
Switching Regulator VDDH
The switching regulator is a high-frequency (750 kHz),
conventional buck converter with integrated high-side pchannel power MOSFET. Its output voltage is regulated to
provide 5.0 V with ±2% accuracy and it is intended to directly
power the digital and analog circuits of the Electronic Control
Module (ECM). The switching regulator output is rated for
1400 mA total output current. This current can be used by the
linear regulator VDDL and sensor supplies VREF1 and VREF2.
The 33998 switching controller utilizes "Sensorless Current
Mode Control" to achieve good line rejection and stabilize the
feedback loop. A soft-start feature is incorporated into the
33998. When the device is enabled, the switching regulator
output voltage VDDH ramps up to about half of full scale and
then takes 16 steps up to the nominal regulation voltage level
(5.0 V nominal).
above 17 V are considered “double faults” and neither one of
the VREF outputs is protected against such conditions.
Depending on the VDDH capacitor value and its ESR value,
the severity of the short may disrupt the VDDH operation.
Keep-Alive (Standby) Regulator VKAM
The Keep-Alive Regulator VKAM (keep-alive memory) is
intended to provide power for “key off” functions such as
nonvolatile SRAM, “KeyOff" timers and controls, KeySwitch
monitor circuits, and perhaps a CAN/SCP monitor and wakeup function. It may also power other low-current circuits
required during a “KeyOff” condition. The regulated voltage is
nominally 2.6 V. A severe fault condition on the VKAM output is
signaled by pulling the VKAMOK signal low.
2.6 V Linear Regulator VDDL
VKAM Keep-Alive Operation (Standby, Power-Down
Mode)
The 2.6 V linear post-regulator is powered from the 5.0 V
switching regulator output (VDDH). A discrete pass transistor is
used to the power path for the VDDL regulator. This
arrangement minimizes the power dissipation off the controller
IC. The FBL pin is the feedback input of the regulator control
loop and the DRVL pin the external NPN pass transistor base
drive. Power up, power down, and fault management are
coordinated with the 5.0 V switching regulator.
When the EN pin is pulled low, the power supply is forced
into a low-current standby mode. In order to reduce current
drawn by the VPWR and KA_VPWR pins, all power supply
functions are disabled except for the VKAM and Enable (EN)
pins. The latter pin is monitored for the "wake-up" signal. The
switching transistor gate is actively disabled and the VDDL and
VDDH pins are actively pulled low.
Sensor Supplies VREF1 and VREF2
The sensor supplies are implemented using a protected
switch to the main 5.0 V (switching regulator) output. The
33998 integrated circuit provides two low-resistance LDMOS
power MOSFETs connected to the switching regulator output
(VDDH). These switches have short-to-battery and short-toground protection integrated into the IC. When a severe fault
conditions is detected, the affected sensor output is turned off
and the sensor Retry Timer starts to time out. After the Retry
Timer expires, the sensor supply tries to power up again.
Sensor supplies VREF can be disabled by pulling the Sensor
Enable SNSEN pin low (see Figure 7 for the VREF Retry Timer
operation).
Notes: Severe fault conditions on the VREF1 and VREF2
outputs, like hard shorts to either ground or battery, may disrupt
the operation of the main regulator VDDH. Shorts to battery
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Power-Up Delay Timers
Two Power-Up Delay timers are integrated into the control
section of the integrated circuit. One timer monitors the input
voltage at the VPWR input pin (see Figure 3), and the other
monitors the input voltage at the KA_VPWR input pin. In both
cases, sufficient supply voltage must be present long enough
for the timers to “time out” before the switching regulator can be
enabled.
Fault-Off Timer
If the VDDL output voltage does not reach its valid range at
the end of soft-start period, or if the VDDH or VDDL output
voltage gets below its PWROK threshold level, the Fault-Off
Timer shuts the switching regulator off until the timer “times
out” and the switching regulator retries to power up again (see
Figure 7 for Fault-Off Timer operation details).
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33998
13
Freescale Semiconductor, Inc.
Power-On Reset Timer
This timer starts to time out at the end of the soft-start period
if the VDDH and VDDL outputs are in the valid regulation range.
If the timer “times out”, then the open-drain PWROK signal is
released, indicating that “power is ON”.
Supervisory Circuits PWROK and VKAMOK
The VKAMOK signal indicates a severe fault condition on
the keep-alive regulator output VKAM. The VKAM output voltage
is compared to the internal bandgap reference voltage. When
the VKAM falls below the bandgap reference voltage level, the
VKAMOK signal is pulled low.
Freescale Semiconductor, Inc...
The 33998 has two voltage monitoring open-drain outputs,
the PWROK and the VKAMOK pins. PWROK is "active high".
This output is pulled low when either of the regulator outputs
(VDDH or VDDL) are below their regulation windows. If both
regulator outputs are above their respective lower thresholds,
and the Power-On Reset Timer has expired, the output driver is
turned off and this pin is at high-impedance state (see
Figure 6).
33998
14
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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Freescale Semiconductor, Inc.
APPLICATIONS
3 399 8
Lf1
10uH
Cf1
10 uF
Cf 2
C1
1.0uF 100uF
V PW R
4
C2
1.0uF
9
I-lim
Ramp
Soft
St art
Dp1
11
V SUM
12
O sc
Freescale Semiconductor, Inc...
Dp 2
Cc1
2.2nF
V bg
KA _V PWR
C4
100nF
FBKB
Logic
&
Latch
Enb
R3
C3
2 .2 R
68uF
C8
390 pF
O pt io nal
Snubber
D1
Drive
VDDH = 5.0V
@ 1400mA total
L1
15uH
VSW
Rc1
3.6k
VDDH
2
15
Retry
V REF1
Ba ndgap
Voltage
Snsenb Referen ce
Vb g
2. 6V
Linear
Regulat or
Driver
Enb
Re g.
DRVL
14
VREF1
21
Cs1
33 nF
E nb
Retry
P OR
Snsenb
V REF2
Re g.
V bg
2.6V
St and by
Reg .
Enable
Control
@ 40 0mA
C5
1 00n F
V KAM = 2.6V
@ 10mA
VKAM
24
C7
4 .7 uF
R1
1 0k
R2
10k
10
VKAMOK
PwrO K
SNSEN 22
C6
68uF
PW ROK
En b
Ch arge
Pump
C RES 3
V DDL = 2. 6V
Sns enb
VREF2
16
Cs2
33nF
Q1
13
FB L
1
VkamO K
EN 23
5-8
17 -20
G ND
C9
22n F
Note The VDDH total output current is 1.4 A. This includes the current used by the linear regulator VDDL and buffered outputs VREF1 and VREF2.
Figure 8. 33998 Application Circuit Schematic Diagram
Table 1. Recommended Components
Designator
Value/Rating
Description/Part No.
Manufacturer (Note 16)
Cf1
10 µF/50 V
Aluminum Electrolytic/UUB1H100MNR
Nichicon
Cf2, C2
1.0 µF/50 V
Ceramic X7R/C1812C105K5RACTR
Kemet
C1
100 µF/50 V
Aluminum Electrolytic/UUH1V101MNR
Nichicon
C3 (Note 15)
68 µF/10 V
Tantalum/T494D686M010AS
Kemet
C6
68 µF/10 V
Tantalum/T494D686M010AS
Kemet
C7
4.7 µF/10 V
Tantalum/T494A475M010AS
Kemet
C4, C5
100 nF/16 V
Ceramic X7R
Any Manufacturer
C8 (Optional)
390 pF/50 V
Ceramic X7R
Any Manufacturer
C9
22 nF/25 V
Ceramic X7R
Any Manufacturer
Notes
15. It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 µF/6.3 V X7R ceramic. In this case the compensation resistor
has to be changed to Rc1 = 200 Ω to stabilize the switching regulator operation.
16. Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or
tables. While Motorola offers component recommendations in this configuration, it is the customer’s responsibility to validate their application.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33998
15
Freescale Semiconductor, Inc.
Designator
Value/Rating
Description/Part No.
(Note 16)
17)
Manufacturer (Note
Cs1, Cs2
33 nF/25 V
Ceramic X7R
Any Manufacturer
Cc1
2.2 nF/16 V
Ceramic X7R
Any Manufacturer
R1, R2
10 kΩ
Resistor 0805, 5%
Any Manufacturer
R3 (Optional)
2.2 Ω
Resistor 0805, 5%
Any Manufacturer
Rc1
3.6 kΩ
Resistor 0805, 5%
Any Manufacturer
Lf1
10 µH
Freescale Semiconductor, Inc...
L1
15 µH
CDRH127-100M
Sumida
or SLF10145-100M2R5
TDK
CDRH127-150MC
Sumida
or SLF10145-150M2R2
TDK
Q1
1.0 A/20 V
Bipolar Transistor/BCP68T1
ON Semiconductor
D1
2.0 A/50 V
Schottky Diode/SS25
General Semiconductor
Dp1
3.0 A/200 V
Diode/MURS320
ON Semiconductor
Dp2
27 V
Transient Voltage Suppressor/SM5A27
General Semiconductor
Notes
17. Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or
tables. While Motorola offers component recommendations in this configuration, it is the customer’s responsibility to validate their application.
33998
16
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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PACKAGE DIMENSIONS
DW SUFFIX
24-LEAD SOIC WIDE BODY
PLASTIC PACKAGE
CASE 751E-04
ISSUE E
-A24
-B-
12X
P
0.010 (0.25)
Freescale Semiconductor, Inc...
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN
EXCESS OF D DIMENSION AT MAXIMUM MATERIAL
CONDITION.
13
1
M
B
M
12
24X
D
J
0.010 (0.25)
M
T A
S
B
S
F
R
X 45 °
C
-TSEATING
PLANE
M
22X
G
K
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
15.25
15.54
7.40
7.60
2.35
2.65
0.35
0.49
0.41
0.90
1.27 BSC
0.23
0.32
0.13
0.29
0°
8°
10.05
10.55
0.25
0.75
INCHES
MIN
MAX
0.601
0.612
0.292
0.299
0.093
0.104
0.014
0.019
0.016
0.035
0.050 BSC
0.009
0.013
0.005
0.011
0°
8°
0.395
0.415
0.010
0.029
33998
17
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
NOTES
33998
18
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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Freescale Semiconductor, Inc...
NOTES
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33998
19
Freescale Semiconductor, Inc...
Freescale Semiconductor, Inc.
Information in this document is provided solely to enable system and software implementers to use Motorola products. There are no express or implied
copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product
or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be
provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating
parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license
under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for
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respective owners.
© Motorola, Inc. 2003
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MC33998/D