MC33998_06 [FREESCALE]
Switching Power Supply with Linear Regulators; 开关电源与线性稳压器
| 型号： | MC33998_06 |
| 厂家： | 
Freescale |
| 描述： | Switching Power Supply with Linear Regulators |
| 文件： | 总20页 (文件大小：622K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Document Number: MC33998
Rev. 2.0, 8/2006
Freescale Semiconductor
Technical Data
Switching Power Supply with
Linear Regulators
33998
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.
SWITCHING REGULATOR
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.
DW SUFFIX
EG SUFFIX (PB-FREE)
98ASB42344B
The 33998 provides proper power supply sequencing for
advanced microprocessor architectures such as the MPC5xx and
683xx microprocessor families.
24-PIN SOICW
ORDERING INFORMATION
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
Temperature
Package
Device
Range (T )
A
MC33998DW/R2
MCZ33998EG/R2
-40°C to 125°C
24 SOICW
• 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
• Pb-Free Packaging Designated by Suffix Code EG
33998
KA_VPWR
V
DDH
VSW
5.0 V
VPWR
VDDH
MCU
VREF1
VREF2
5.0 V
5.0 V
DRVL
FBL
V
DDL
2.6 V
V
KAM
VKAM
2.6 V
EN
SNSEN
PWROK
VKAMOK
GND
Figure 1. 33998 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as
may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
33998
VPWR
VSW
5.0 V
Drive
I-lim
Ramp
Soft
Start
FBKB
Logic
&
Enb
Latch
VSUM
Osc
V
KA_VPWR
bg
VDDH
Retry
Bandgap
Voltage
Reference
DRVL
FBL
V
bg
2.6V
Enb
Linear
Regulator
Driver
Snsenb
V
2.6 V
2.6 V
REF1
Reg.
VREF1
5.0 V
Enb
V
2.6V
Standby
Reg.
VKAM
Retry
POR
bg
Snsenb
Snsenb
Enb
V
Enable
Co nt ro l
REF2
PWROK
VKAMOK
Reg.
VREF2
5.0 V
PwrOK
VkamOK
Charge
Pump
CRES
SNSEN
EN
PGND
Figure 2. 33998 Simplified Internal Block Diagram
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
2
PIN CONNECTIONS
PIN CONNECTIONS
1
24
23
22
21
20
19
18
17
16
15
14
13
VKAMOK
KA_VPWR
CRES
VPWR
GND
VKAM
EN
2
3
SNSEN
VREF1
GND
4
5
6
GND
GND
7
GND
GND
8
GND
GND
9
VSW
VREF2
VDDH
FBL
10
11
12
PWROK
FBKB
VSUM
DRVL
Figure 3. 33998 Pin Connections
Definition
Table 1. Pin Definitions
Pin
Pin Number
Name
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.
1
2
VKAMOK
Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections
and ignition switch activated connections.
KA_VPWR
Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump.
3
4
CRES
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.
Ground of the integrated circuit.
5–8
9
GND
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.
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.
10
PWROK
Step-Down Switching Regulator Feedback Pin. The FBKB pin is the VDDH feedback signal for the
switching regulator.
11
12
13
FBKB
VSUM
DRVL
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.
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.
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.
14
15
FBL
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.
VDDH
Sensor Supply #2 Output. The VREF2 pin is sensor supply output #2.
Ground of the integrated circuit.
16
17–20
21
VREF2
GND
Sensor Supply #1 Output. The VREF1 pin is sensor supply output #1.
VREF1
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
PIN CONNECTIONS
Table 1. Pin Definitions (continued)
Pin
Pin Number
Definition
Name
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.
22
23
24
SNSEN
EN
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.
VKAM
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
4
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Value
Unit
Main Supply Voltage
Keep-Alive Supply Voltage
Switching Node
V
-0.3 to 45
-0.3 to 45
-0.5 to 45
-0.3 to 6.0
V
V
V
V
V
PWR
KA_V
PWR
V
SW
5.0 V Input Power
Sensor Supply
V
DDH
V
V
-0.3 to 18
-0.3 to 18
REF1
REF2
Keep-Alive Supply Voltage
V
-0.3 to 6.0
V
V
KAM
Maximum Voltage at Logic I/O Pins
EN
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
SNSEN
PWROK
VKAMOK
Charge Pump Reservoir Capacitor Voltage
Error Amplifier Summing Node
Switching Regulator Output Feedback
VDDL Base Drive
C
-0.3 to 18
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
V
V
V
V
V
V
RES
V
SUM
FBKB
DRVL
FBL
VDDL Feedback
ESD Voltage
Human Body Model (all pins) (1)
Machine Model (all pins) (1)
V
±500
±100
ESD1
V
ESD2
PD
Power Dissipation (TA = 25°C) (2)
800
60
mW
°C/W
°C/W
°C
Thermal Resistance, Junction to Ambient (3)
Thermal Resistance, Junction to Board (5)
,
(4)
RθJA
RθJB
TA
20
Operational Package Temperature [Ambient Temperature] (6)
-40 to 125
Notes
1. ESD1 testing is performed in accordance with the Human Body Model (C
=100 pF, R
=1500 Ω). ESD2 testing is performed in
ZAP
ZAP
accordance with the Machine Model (C
=200 pF, R
=0 Ω)
ZAP
ZAP
2. Maximum power dissipation at indicated junction temperature.
3. 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.
4. Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal.
5. 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.
6. The limiting factor is junction temperature, taking into account the power dissipation, thermal resistance, and heat sinking.
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings (continued)
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Value
Unit
Operational Junction Temperature
TJ
-40 to 150
-55 to 150
Note 8
°C
Storage Temperature
TSTG
TPPRT
°C
°C
Peak Package Reflow Temperature During Reflow (7)
,
(8)
7. Pin 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.
8. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow
Temperature and Moisture Sensitivity Levels (MSL),
Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e.
MC33xxxD enter 33xxx), and review parametrics.
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
6
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. 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
Unit
GENERAL
Supply Voltage Range
V
Normal Operating Voltage Range (9)
Extended Operating Voltage Range (9)
V
6.0
18
–
–
18
PWR(N)
V
26.5
PWR(E)
Maximum Transient Voltage - Load Dump (10)
VPWR Supply Current
V
–
–
–
40
V
PWR(LD)
IVPWR
mA
EN = 5.0 V, V
= 14 V, No Loads
25
150
PWR
VPWR Quiescent Supply Current
EN = 0 V, V = 12 V
IQVPWR
IKAVPWR
IQKAVPWR
µA
mA
µA
5.0
0.5
50
–
–
–
15
3.0
350
PWR
KA_VPWR Supply Current,
EN = 5.0 V, KA_V = 14 V, No Load on V
PWR
KAM
KA_VPWR Quiescent Supply Current
EN = 0 V, KA_V = 12 V
PWR
BUCK REGULATOR (VDDH)
Buck Converter Output Voltage
IVDDH = 200 mA to 1.4 A, V
V
V
V
V
DDH
= KA_V
= 14 V
PWR
4.9
4.9
-20
–
–
–
5.1
5.1
30
PWR
Buck Converter Output Voltage
IVDDH = 1.4 A, V = KA_V
DDH
= 6.0 V
PWR
PWR
VDDH Line Regulation
= KA_V
REGLNVDDH
REGLDVDDH
mV
mV
V
= 10 V to 14 V, IVDDH = 200 mA
PWR
PWR
VDDH Load Regulation
V
V
= KA_V
= KA_V
= 14 V, IVDDH = 200 mA to 1.4 A
= 6.0 V, IVDDH = 200 mA to 1.4 A
-20
-20
–
–
20
20
PWR
PWR
PWR
PWR
VDDH Active Discharge Resistance
= KA_V = 14 V, EN = 0 V, IVDDH = 10 mA
R
Ω
HDISCH
V
1.0
–
15
PWR
PWR
P-CHANNEL MOSFET
Drain-Source Breakdown Voltage—Not Tested (11)
Drain-Source Current Limit—Not Tested (11)
Notes
BVDSS
45
–
–
–
–
V
A
ISCSW1
-7.0
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) V
must be between 4.9 V and 5.1 V (200 mA to 1.4 A) for V
= 14 V to 18 V.
DDH
DDH
PWR
PWR
b) V
must be between 4.8 V and 5.5 V (200 mA to 1.4 A) for V
= 18 V to 26.5 V.
10. Part can survive, but no parameters are guaranteed.
11. Guaranteed by design but not production tested.
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
7
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. 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
Unit
LINEAR REGULATOR (VDDL)
VDDL Output Voltage
= KA_V
V
V
mV
mV
mA
Ω
DDL
V
= 14 V, IVDDL = 200 mA
PWR
2.5
-30
-70
5.0
1.0
0.6
2.6
–
2.7
30
70
25
10
10
PWR
VDDL Line Regulation
= 4.8 V to 5.2 V, IVDDL = 400 mA
REGLNVDDL
REGLDVDDL
IDRVL
V
DDH
VDDL Load Regulation
= KA_V
V
= 14 V, IVDDL = 10 mA to 400 mA
= 14 V, VDRVL = 1.0 V
PWR
–
PWR
PWR
DRVL Output Current
= KA_V
V
11
–
PWR
VDDL Active Discharge Resistance
= KA_V = 14 V, EN = 0 V, IFBL = 10 mA
R
LDISCH
V
PWR
PWR
VDDH to VDDL Active Clamp Resistance
= KA_V = 14 V, EN = 0 V, IVDDH = 50 mA, V = 0 V
FBKB
R
Ω
CLAMP
V
–
PWR
PWR
VDDL Output Capacitor Capacitance (12)
VDDL Output Capacitor ESR (12)
CVDDL
–
–
68
–
–
µF
ESRVDDL
0.125
Ω
KEEP-ALIVE (STANDBY) REGULATOR (VKAM)
VKAM Output Voltage
V
V
V
V
KAM
IVKAM = 5.0 mA, VPWR = KA_V
= 18 V, EN = 5.0 V
2.5
–
2.7
PWR
VKAM Output Voltage, EN = 0 V (Standby Mode)
KAM
V
V
V
V
= KA_V
= KA_V
= KA_V
= 26 V, IVKAM = 0.5 mA
= 18 V, IVKAM = 5.0 mA
= 5.0 V, IVKAM = 10.0 mA
2.5
2.5
2.5
2.0
–
–
–
–
2.7
2.7
2.7
2.7
PWR
PWR
PWR
PWR
PWR
PWR
PWR
= 0 V, KA_V
= 3.5 V, IVKAM = 5.0 mA
PWR
VKAM Line Regulation, EN = 0 V (Standby Mode)
= KA_V = 5.0 V to 18 V, IVKAM = 2.0 mA
REGLNVKAM
REGLDDVKAM
REGVKAM
mV
mV
mV
V
-20
0
–
–
–
20
100
60
PWR
PWR
VKAM Load Regulation, EN = 0 V (Standby Mode)
V
= KA_V
= 14 V, IVKAM = 1.0 mA to 10 mA
PWR
PWR
Differential Voltage V
- V
KAM
DDL
EN = 5.0 V, IVKAM = 5.0 mA, V
= KA_V
= 14 V, IVDDL = 200 mA
PWR
-20
PWR
VKAM Output Capacitor Capacitance (12)
VKAM Output Capacitor ESR (12)
CVKAM
–
–
4.7
1.4
–
–
µF
ESRVKAM
Ω
Notes
12. Recommended value.
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
8
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. 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
SENSOR SUPPLIES (VREF1, VREF2)
Symbol
Min
Typ
Max
Unit
VREF On-Resistance, TA = -40°C
IVREF = 200 mA, IVDDH = 200 mA, V
RDS(ON)
RDS(ON)
RDS(ON)
ISC_BAT
ISC_GND
CVREF
mΩ
mΩ
mΩ
mA
mA
nF
= KA_V
= KA_V
= KA_V
= 14 V, EN = 5.0 V
= 14 V, EN = 5.0 V
= 14 V, EN = 5.0 V
–
–
–
–
–
–
280
350
455
900
PWR
PWR
PWR
PWR
PWR
PWR
VREF On-Resistance, TA = +25°C
IVREF = 200 mA, IVDDH = 200 mA, V
VREF On-Resistance, TA = +125°C
IVREF = 200 mA, IVDDH = 200 mA, V
–
VREF Short-to-Battery Detect Current
V
= KA_V
= 14 V, EN = 5.0 V, SNSEN = 5.0 V
PWR
500
PWR
VREF Short-to-Ground Detect Current
= KA_V = 14 V, EN = 5.0 V, SNSEN = 5.0 V
V
500
33
–
–
900
39
PWR
PWR
Maximum Output Capacitance (Total) (13)
SUPERVISORY CIRCUITS (VPWR)
PWROK Undervoltage Threshold on V
, FBL Ramps Down
VFBL(THL)
VDDH(THL)
VDDH(THH)
RDS(ON)
V
V
V
Ω
V
V
Ω
DDL
V
= KA_V
= 14 V, IVDDH = 200 mA
PWR
2.1
4.5
5.12
–
2.4
–
2.5
4.8
5.7
200
2.5
5.0
200
PWR
PWROK Undervoltage Threshold on V
DDH
V
= KA_V
= 14 V, IVDDH = 200 mA
PWR
PWR
VDDH Overvoltage Threshold
= KA_V = 10 V, IVDDH = 200 mA
V
–
PWR
PWR
PWROK Open Drain On-Resistance
V
= KA_V
= 14 V, EN = 5 V, IPwrOK = 5.0 mA
= 14 V, IVDDH = 200 mA
PWR
–
PWR
PWR
VKAMOK Threshold,
= KA_V
VKAM(THL)
VPWROK(TH)
RDS(ON)
V
2.1
4.0
50
2.4
–
PWR
VKAMOK Threshold on V
, V
Ramps Up
PWR PWR
KA_V
= 14 V, IVDDH = 200 mA
PWR
VKAMOK Open Drain On-Resistance
= KA_V = 14 V, EN = 0 V, IVKAMOK = 10 mA
V
–
PWR
PWR
Enable Input Voltage Threshold (Pin EN)
VIH
IPD
VIH
IPD
1.0
500
1.0
–
–
–
2.0
1200
2.0
V
nA
V
Enable Pull-Down Current (Pin EN), EN = 1.0 V V
to VIL(MIN)
DDH
Sensor Enable Input Voltage Threshold (Pin SNSEN)
Sensor Enable Pull-Down Current (Pin SNSEN)
nA
SNSEN = 1.0 V V
to VIL(MIN)
500
–
1200
DDH
Notes
13. Recommended value.
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. 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
Unit
CHARGE PUMP (CRES)
VCRES
V
Charge Pump Voltage
12
12
–
–
15
15
V
V
= KA_V
= KA_V
= 14 V, IVDDH = 200 mA, ICP = 0 µA
= 14 V, IVDDH = 200 mA, ICP = 10 µA
PWR
PWR
PWR
PWR
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
10
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. 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
BUCK REGULATOR (VDDH)
Switching Frequency (14)
fSW
tSS
–
750
–
–
kHz
ms
Soft Start Duration (see Figure 2)
= KA_V = 6.0 V
V
5.0
15
PWR
PWR
CHARGE PUMP (CRES)
Charge Pump Current Ramp-Up Time
tCRES
ms
ms
V
= KA_V
= 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V
PWR
1.0
1.0
–
–
20
10
PWR
Charge Pump Ramp-Up Time
= KA_V = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V
tCRES
V
PWR
PWR
SENSOR SUPPLIES (VREF1, VREF2)
VREF Overcurrent Detection Time (see Figure 3)
tDET
µs
V
Load RL = 5.0 Ω to GND, V
= 5.1 V, V
= KA_V
= KA_V
= 10 V,
= 10 V,
REF
DDH
PWR
PWR
PWR
EN = 5.0 V, SNSEN = 5.0 V
VREF Retry Timer Delay (see Figure 3)
Load RL = 5.0 Ω to GND, V
0.5
5.0
–
–
2.0
20
tRET
ms
V
= 5.1 V, V
REF
DDH
PWR
EN = 5.0 V, SNSEN = 5.0 V
SUPERVISORY CIRCUITS (VPWR)
PWROK Delay Time (Power-On Reset) (see Figure 4)
VKAMOK Delay Time (see Figure 5)
tD(PWROK)
tD(VKAMOK)
tD(VPWR)
tFAULT
5.0
10
–
–
–
–
15
30
10
10
ms
ms
ms
ms
VDDH Power-Up Delay Time (see Figure 6)
Fault-Off Timer Delay Time (see Figure 7)
1.0
1.0
Notes
14. Guaranteed by design but not production tested.
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
ELECTRICAL CHARACTERISTICS
TIMING DIAGRAMS
TIMING DIAGRAMS
6.0
0
5.0
0
2.5V
t
SS
5.0
0
4.8V
TIME
Figure 4. Soft-Start Time
14
0
5.0
0
t
Det
4.8V
5.0
2.0V
2.0V
0
t
Ret
2.6
0
TIME
Figure 5. VREF Retry Timer
14
0
5.0
0
5.0
4.6V
t
D(PWROK)
0
2.6
0
TIME
Figure 6. PWROK Delay Timer (Power-On Reset)
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
12
ELECTRICAL CHARACTERISTICS
TIMING DIAGRAMS
6.0
0
V
= 0V
PWR
5.0
0
2.6
2.4V
t
D(VKAMOK)
0
2.6
0
TIME
Figure 7. VKAMOK Delay Time
18
0
5.0
0
18
t
D(VPWR)
0
5.0
2.0V
0
TIME
Figure 8. VDDH Power-Up Delay Time
14
0
5.0
0
2.6
0
5.0
4.7V
4.7V
1.0V
1.0V
0
t
t
Fault
Fault
2.6
0
TIME
Figure 9. Fault-Off Timer Delay Time
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
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
battery above 17 V are considered “double faults” and neither
one of the VREF outputs is protected against such
conditions.
SWITCHING REGULATOR (VDDH)
The switching regulator is a high-frequency (750 kHz),
conventional buck converter with integrated high-side p-
channel 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
Depending on the VDDH capacitor value and its ESR
value, the severity of the short may disrupt the VDDH
operation.
KEEP-ALIVE REGULATOR, STANDBY (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 wake-
up 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.
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).
2.6 V LINEAR REGULATOR (VDDL)
KEEP-ALIVE OPERATION, STANDBY, POWER-
DOWN MODE (VKAM)
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.
POWER-UP DELAY TIMERS
SENSOR SUPPLIES (VREF1) AND (VREF2)
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.
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-to-
ground 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).
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).
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
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
14
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
(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).
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”.
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.
SUPERVISORY CIRCUITS (PWROK) AND
(VKAMOK)
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
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
TYPICAL APPLICATIONS
FUNCTIONAL PIN DESCRIPTION
TYPICAL APPLICATIONS
33998
V
=5.0V
Lf1
10uH
L1
15uH
DDH
@ 1400mA total
VPWR
VSW
4
9
R3
C3
68uF
Cf1
10uF
Cf2
1.0uF 100uF
C1
C4
100nF
C2
2.2R
D1
Drive
1.0uF
I-lim
C8
390pF
Optional
Snubber
Ramp
Soft
Start
FBKB
Logic
&
Enb
11
Latch
VSUM
Dp1
Osc
12
Cc 1
Rc1
2.2nF 3.6k
V
KA_VPWR
2
bg
VDDH
15
Dp2
Retry
Bandgap
Voltage
Reference
DRVL
V
bg
2.6V
Enb
Q1
Linear
Regulator
Driver
13
FBL
Snsenb
V
=2.6V
V
DDL
REF1
@ 400mA
Reg.
14
C5
100nF
C6
68uF
VREF1
21
Enb
V
Cs1
V
= 2.6V
VKAM
24
2.6V
Standby
Reg.
KAM
33nF
Retry
POR
@ 10mA
bg
C7
4.7uF
R1
R2
10k 10k
Snsenb
Snsenb
Enb
V
Enable
Control
REF2
Reg.
PWROK
10
VKAMOK
VREF2
16
1
Cs2
PwrOK
VkamOK
Charge
Pump
33nF
CRES
3
SNSEN 22 EN 23
5-8 GND
17-20
C9
22nF
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 10. 33998 Application Circuit Schematic Diagram
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
16
TYPICAL APPLICATIONS
FUNCTIONAL PIN DESCRIPTION
Table 5. Recommended Components
Designator
Value/Rating
Description/Part No.
Manufacturer (16)
Cf1
Cf2, C2
C1
10 µF/50 V
1.0 µF/50 V
100 µF/50 V
68 µF/10 V
68 µF/10 V
4.7 µF/10 V
100 nF/16 V
390 pF/50 V
22 nF/25 V
33 nF/25 V
2.2 nF/16 V
10 kΩ
Aluminum Electrolytic/UUB1H100MNR
Ceramic X7R/C1812C105K5RACTR
Aluminum Electrolytic/UUH1V101MNR
Tantalum/T494D686M010AS
Tantalum/T494D686M010AS
Tantalum/T494A475M010AS
Ceramic X7R
Nichicon
Kemet
Nichicon
C3 (15)
C6
Kemet
Kemet
C7
Kemet
C4, C5
C8 (Optional)
C9
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Ceramic X7R
Ceramic X7R
Cs1, Cs2
Cc1
Ceramic X7R
Ceramic X7R
R1, R2
R3 (Optional)
Rc1
Resistor 0805, 5%
2.2 Ω
Resistor 0805, 5%
3.6 kΩ
Resistor 0805, 5%
Lf1
10 µH
CDRH127-100M
Sumida
TDK
or SLF10145-100M2R5
L1
15 µH
CDRH127-150MC
Sumida
TDK
or SLF10145-150M2R2
Q1
D1
1.0 A/20 V
2.0 A/50 V
3.0 A/200 V
27 V
Bipolar Transistor/BCP68T1
Schottky Diode/SS25
ON Semiconductor
General Semiconductor
ON Semiconductor
Dp1
Dp2
Diode/MURS320
Transient Voltage Suppressor/SM5A27
General Semiconductor
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. Freescale Semiconductor does not assume liability, endorse, or warrant components from external manufacturers that are referenced in
circuit drawings or tables. While Freescale Semiconductor offers component recommendations in this configuration, it is the customer’s
responsibility to validate their application.
17. Freescale Semiconductor does not assume liability, endorse, or warrant components from external manufacturers that are referenced in
circuit drawings or tables. While Freescale Semiconductor offers component recommendations in this configuration, it is the customer’s
responsibility to validate their application.
33998
Analog Integrated Circuit Device Data
17
Freescale Semiconductor
PACKAGING
PACKAGE DIMENSIONS
PACKAGING
PACKAGE DIMENSIONS
For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below.
DWB SUFFIX
EG SUFFIX (PB-FREE)
24 PIN SOIC WIDE BODY
PLASTIC PACKAGE
98ASB42344B
ISSUE F
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
18
REVISION HISTORY
REVISION HISTORY
Revision
Date
Description of Changes
•
•
•
•
•
Implemented Revision History page
Converted to Freescale format
Update to the prevailing form and style
Removed MC33998EG/R2, and replaced with MCZ33998EG/R2 in the Ordering Information block
Removed Peak Package Reflow Temperature During Reflow (solder reflow) parameter from
Maximum Ratings on page 5. Added note with instructions from www.freescale.com.
8/2006
2.0
33998
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
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MC33998
Rev. 2.0
8/2006
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