MC33997 [MOTOROLA]
Switching Power Supply with Linear Regulators; 开关电源与线性稳压器
| 型号： | MC33997 |
| 厂家： | 
MOTOROLA |
| 描述： | Switching Power Supply with Linear Regulators |
| 文件： | 总20页 (文件大小：456K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Freescale Semiconductor, Inc.
MOTOROLA
Document order number: MC33997/D
Rev 3.0, 03/2003
SEMICONDUCTOR TECHNICAL DATA
Advance Information
33997
Switching Power Supply with Linear
Regulators
The 33997 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
3.3 V linear regulator uses an external pass transistor to reduce the 33997
power dissipation. The 33997 also provides a 3.3 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 33997 provides proper power supply sequencing for advanced
microprocessor architectures such as the Motorola MPC5xx and 683xx
microprocessor families.
DW SUFFIX
24-LEAD SOICW
CASE 751E
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 = 3.3 V @ 400 mA
• Low-Power Standby Linear Regulator VKAM = 3.3 V @ 10 mA
ORDERING INFORMATION
Temperature
Device
MC33997DW/R2
Package
• Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected Against
Range (T )
A
Short-to-Battery and Short-to-Ground with Retry Capability
-40°C to 125°C
24 SOICW
• 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
33997 Simplified Application Diagram
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
For More Information On This Product,
© Motorola, Inc. 2003
Go to: www.freescale.com
Freescale Semiconductor, Inc.
33997
V
V
PWR
SW
5.0 V
Drive
I-lim
Ramp
Soft
FBKB
Logic
&
Start
Enb
Latch
V
SUM
Osc
V
KA_V
bg
PWR
V
DDH
Retry
Bandgap
DRVL
FBL
V
bg
3.3V
Linear
Enb
Voltage
Reference
Snsenb
Regulator
Driver
V
REF1
3.3 V
3.3 V
Reg.
V
5.0 V
REF1
REF2
Enb
V
3.3V
Standby
Reg.
V
KAM
Retry
POR
bg
Snsenb
Snsenb
Enb
V
Enable
Control
REF2
Reg.
PWROK
V
5.0 V
VKAMOK
PwrOK
VkamOK
Charge
Pump
C
SNSEN
EN
GND
RES
Figure 1. 33997 Simplified Block Diagram
33997
2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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1
24
23
22
21
20
19
18
17
16
15
14
13
VKAMOK
V
KAM
2
KA_V
EN
PWR
3
C
PWR
SNSEN
V
GND
GND
GND
GND
RES
4
V
REF1
5
GND
GND
GND
GND
6
7
8
9
V
V
V
FBL
SW
REF2
DDH
10
11
12
PWROK
FBKB
V
DRVL
SUM
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 . When the supply voltage to the 33997 is disconnected or lost, the VKAMOK signal goes low.
KAM
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
4
C
Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump.
RES
V
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.
PWR
5–8
9
GND
Ground of the integrated circuit.
V
Internal P-Channel Power MOSFET Drain. V
is the "switching node" of the voltage buck converter. This pin
SW
SW
is connected to the V
pin by an integrated p-channel MOSFET.
PWR
10
PWROK
FBKB
Power OK Reset Pin. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to
, V , or V . When either V or V output voltage goes out of the regulation limits this pin is
pulled down.
V
KAM DDH
DDL
DDH
DDL
11
12
13
Step-Down Switching Regulator Feedback Pin. The FBKB pin is the V
regulator.
feedback signal for the switching
DDH
V
Error Amplifier "Summing Node". The V
pin is connected to the inverting input of the error amplifier. This
SUM
SUM
node is also the "common" point of the integrated feedback resistor divider.
DRVL
FBL
Drive for V (3.3 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the
DDL
V
linear post regulator. The collector of the VDDL pass transistor is connected to V
. An example of a
DDH
DDL
suitable pass transistor is BCP68.
14
15
Feedback for V (3.3 V) Regulator. The FBL pin is the voltage feedback sense signal from the V
(3.3 V)
DDL
DDL
linear post regulator.
V
V
is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the 3.3 V
DDH
DDH
linear power regulator. The V
pin is supplied from the switching regulator output, capable of providing 5.0 V
DDH
@ 1400 mA total output current.
16
V
Sensor Supply #2 Output. The V
pin is sensor supply output #2.
REF2
REF2
17–20
21
GND
Ground of the integrated circuit.
Sensor Supply #1 Output. The V
V
pin is sensor supply output #1.
REF1
REF1
33997
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PIN FUNCTION DESCRIPTION (continued)
Pin
Pin Name
Description
22
SNSEN
Sensor Supply Enable Input. The SNSEN pin is an input, which enables the V
and V
supplies. It
REF1
REF2
allows the control module hardware/software to shut down the sensor supplies.
23
24
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.
V
Keep-Alive (standby) 3.3 V Regulator Output. This is a 3.3 V low quiescent, low dropout regulator for Keep
Alive memory.
KAM
33997
4
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MAXIMUM RATINGS
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Value
Unit
V
-0.3 to 45
V
Main Supply Voltage
PWR
KA_V
PWR
-0.3 to 45
-0.5 to 45
-0.3 to 6.0
V
V
V
V
Keep-Alive Supply Voltage
Switching Node
V
SW
V
5.0 V Input Power
Sensor Supply
DDH
V
-0.3 to 18
-0.3 to 18
REF1
V
REF2
V
-0.3 to 6.0
V
V
Keep-Alive Supply Voltage
KAM
EN
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
Maximum Voltage at Logic I/O Pins
SNSEN
PWROK
VKAMOK
C
-0.3 to 18
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
V
V
V
V
Charge Pump Reservoir Capacitor Voltage
Error Amplifier Summing Node
RES
V
SUM
FBKB
DRVL
Switching Regulator Output Feedback
V
V
Base Drive
Feedback
DDL
DDL
FBL
-0.3 to 6.0
V
V
ESD Voltage
V
±500
±100
Human Body Model (all pins) (Note 1)
Machine Model (all pins) (Note 2)
ESD1
V
ESD2
PD
800
60
mW
°C/W
°C/W
°C
Power Dissipation (TA = 25°C) (Note 3)
RθJ-A
RθJ-B
TA
Thermal Resistance, Junction to Ambient (Note 4), (Note 5)
Thermal Resistance, Junction to Board (Note 6)
Operational Package Temperature [Ambient Temperature] (Note 7)
Operational Junction Temperature
20
-40 to 125
-40 to 150
-55 to 150
260
TJ
°C
TSTG
TS
°C
Storage Temperature
°C
Lead Soldering Temperature (Note 8)
Notes
1. ESD1 testing is performed in accordance with the Human Body Model (C
=100 pF, R
=1500 Ω).
ZAP
ZAP
2. ESD2 testing is performed in accordance with the Machine Model (C
3. Maximum power dissipation at indicated junction temperature.
=200 pF, R
=0 Ω)
ZAP
ZAP
4. 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.
5. Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal.
6. 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.
7. The limiting factor is junction temperature, taking into account the power dissipation, thermal resistance, and heat sinking.
8. 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.
33997
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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
V
Supply Voltage Range
V
6.0
18
–
–
18
26.5
Normal Operating Voltage Range (Note 9)
Extended Operating Voltage Range (Note 9)
PWR(N)
V
PWR(E)
V
–
–
40
V
Maximum Transient Voltage - Load Dump (Note 10)
PWR(LD)
IVPWR
mA
V
Supply Current
PWR
25
–
150
EN = 5.0 V, V
= 14 V, No Loads
PWR
IQ_VPWR
µA
mA
µA
V
Quiescent Supply Current
= 12 V
PWR
5.0
0.5
50
–
–
–
15
3.0
350
EN = 0 V, V
PWR
IKAVPWR
KA_V
Supply Current,
PWR
EN = 5.0 V, KA_V
= 14 V, No Load on V
KAM
PWR
IQ_KAVPWR
KA_V
Quiescent Supply Current
PWR
EN = 0 V, KA_V
= 12 V
PWR
BUCK REGULATOR VDDH
V
V
V
Buck Converter Output Voltage
DDH
4.9
4.9
-20
–
–
–
5.1
5.1
30
I
VDDH = 200 mA to 1.4 A, V
= KA_V
= 14 V
PWR
PWR
V
Buck Converter Output Voltage
DDH
I
VDDH = 1.4 A, V
= KA_V
= 6.0 V
PWR
PWR
RegLnVDDH
RegLdVDDH
mV
V
V
Line Regulation
DDH
V
= KA_V
= 10 V to 14 V, IVDDH = 200 mA
PWR
PWR
mV
Load Regulation
DDH
-20
-20
–
–
20
20
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
PWR
PWR
PWR
PWR
R
Ω
V
Active Discharge Resistance
HDisch
DDH
1.0
–
15
V
= KA_V
= 14 V, EN = 0 V, IVDDH = 10 mA
PWR
PWR
P-CHANNEL MOSFET
BVDSS
IscSW1
45
–
–
–
–
V
A
Drain-Source Breakdown Voltage—Not Tested (Note 11)
Drain-Source Current Limit—Not Tested (Note 11)
Notes
-7.0
9.
V
is fully functional when the 33997 is operating at higher battery voltages, but these parameters are not tested. The test condition as are:
DDH
a) V
b) V
must be between 4.9 V and 5.1 V (200 mA to 1.4 A) for V
must be between 4.8 V and 5.5 V (200 mA to 1.4 A) for V
= 14 V to 18 V.
= 18 V to 26.5 V.
DDH
DDH
PWR
PWR
10. Part can survive, but no parameters are guaranteed.
11. Guaranteed by design but not production tested.
33997
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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
Unit
LINEAR REGULATOR VDDL
V
V
V
V
V
Output Voltage
DDL
DDL
3.15
-70
–
–
–
3.45
70
V
= KA_V
= 14 V, IVDDL = 200 mA
PWR
PWR
RegLnVDDL
RegLdVDDL
IDRVL
mV
mV
Line Regulation
DDL
V
= 4.8 V to 5.2 V, IVDDL = 400 mA
DDH
Load Regulation
DDL
-70
70
V
= KA_V
= 14 V, IVDDL = 10 mA to 400 mA
= 14 V, VDRVL = 1.0 V
PWR
PWR
mA
DRVL Output Current
5.0
1.0
11
–
25
10
V
= KA_V
PWR
PWR
R
Ω
V
V
Active Discharge Resistance
LDisch
DDL
V
= KA_V
= 14 V, EN = 0 V, IFBL = 10 mA
PWR
PWR
R
Ω
to V
Active Clamp Resistance
DDL
CLAMP
DDH
0.6
–
10
V
= KA_V
= 14 V, EN = 0 V, IVDDH = 50 mA, V
= 0 V
FBKB
PWR
PWR
CVDDL
–
–
68
–
–
µF
V
V
Output Capacitor Capacitance (Note 12)
Output Capacitor ESR (Note 12)
DDL
DDL
ESRVDDL
0.125
Ω
KEEP-ALIVE (STANDBY) REGULATOR VKAM
V
V
V
V
Output Voltage
KAM
KAM
3.0
–
3.6
IVKAM = 5.0 mA, VPWR = KA_V
= 18 V, EN = 5.0 V
PWR
V
V
Output Voltage, EN = 0 V (Standby Mode)
KAM
KAM
3.0
3.0
3.0
2.0
–
–
–
–
3.6
3.6
3.6
3.5
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
PWR
PWR
PWR
PWR
PWR
PWR
PWR
= 0 V, KA_V
= 3.5 V, IVKAM = 5.0 mA
PWR
RegLnVKAM
RegLdVKAM
RegVKAM
mV
mV
mV
V
V
Line Regulation, EN = 0 V (Standby Mode)
KAM
-20
0
–
–
–
20
100
20
V
= KA_V
= 5.0 V to 18 V, IVKAM = 2.0 mA
PWR
PWR
Load Regulation, EN = 0 V (Standby Mode)
KAM
V
= KA_V
= 14 V, IVKAM = 1.0 mA to 10 mA
PWR
PWR
Differential Voltage V
- V
DDL
KAM
-20
EN = 5.0 V, IVKAM = 5.0 mA, V
= KA_V
= 14 V, IVDDL = 200 mA
PWR
PWR
CVKAM
–
–
4.7
1.4
–
–
µF
V
V
Output Capacitor Capacitance (Note 12)
Output Capacitor ESR (Note 12)
KAM
KAM
ESRVKAM
Ω
Notes
12. Recommended value.
33997
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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
RDS(on)
RDS(on)
RDS(on)
ISC_Bat
Min
Typ
Max
Unit
mΩ
mΩ
mΩ
mA
mA
nF
SENSOR SUPPLIES VREF1, VREF2
V
V
V
V
V
On-Resistance, TA = -40°C
REF
–
–
–
–
–
–
280
350
455
900
IVREF = 200 mA, IVDDH = 200 mA, V
= KA_V
= KA_V
= KA_V
= 14 V, EN = 5.0 V
= 14 V, EN = 5.0 V
= 14 V, EN = 5.0 V
PWR
PWR
PWR
PWR
PWR
PWR
On-Resistance, TA = +25°C
REF
IVREF = 200 mA, IVDDH = 200 mA, V
On-Resistance, TA = +125°C
REF
–
IVREF = 200 mA, IVDDH = 200 mA, V
Short-to-Battery Detect Current
REF
500
V
= KA_V
= 14 V, EN = 5.0 V, SNSEN = 5.0 V
PWR
PWR
ISC_Gnd
Short-to-Ground Detect Current
REF
500
33
–
–
900
39
V
= KA_V
= 14 V, EN = 5.0 V, SNSEN = 5.0 V
PWR
PWR
CVREF
Maximum Output Capacitance (Total) (Note 13)
SUPERVISORY CIRCUITS
VFBL(thL)
VDDH(thL)
VDDH(thH)
V
PWROK Undervoltage Threshold on V
, FBL Ramps Down
DDL
2.6
4.5
–
–
–
3.1
4.8
5.7
V
= KA_V
= 14 V, IVDDH = 200 mA
PWR
PWR
V
PWROK Undervoltage Threshold on V
DDH
V
= KA_V
= 14 V, IVDDH = 200 mA
PWR
PWR
V
V
Overvoltage Threshold
DDH
5.12
V
= KA_V
= 10 V, IVDDH = 200 mA
PWR
PWR
RDS(on)
VKAM(thL)
VPWRok(th)
Ω
V
V
PWROK Open Drain On-Resistance
–
–
–
–
200
1.9
5.0
V
= KA_V
= 14 V, EN = 5 V, IPwrOK = 5.0 mA
= 14 V, IVDDH = 200 mA
PWR
PWR
PWR
VKAMOK Threshold,
= KA_V
0.9
4.0
V
PWR
VKAMOK Threshold on V
, V
Ramps Up
PWR PWR
KA_V
= 14 V, IVDDH = 200 mA
PWR
RDS(on)
Ω
VKAMOK Open Drain On-Resistance
= KA_V = 14 V, EN = 0 V, IVKAMOK = 10 mA
50
–
200
V
PWR
PWR
VIH
IPD
1.0
–
–
2.0
V
Enable Input Voltage Threshold (Pin EN)
500
1200
nA
Enable Pull-Down Current (Pin EN), EN = 1.0 V V
to VIL(min)
DDH
VIH
IPD
1.0
–
2.0
V
Sensor Enable Input Voltage Threshold (Pin SNSEN)
Sensor Enable Pull-Down Current (Pin SNSEN)
nA
500
–
1200
SNSEN = 1.0 V V
to VIL(min)
DDH
Notes
13. Recommended value.
33997
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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
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
33997
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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
fSW
tSS
–
750
–
–
kHz
ms
Switching Frequency (Note 14)
Soft Start Duration (see Figure 2)
= KA_V = 6.0 V
5.0
15
V
PWR
PWR
CHARGE PUMP CRES
tCRES
ms
ms
Charge Pump Current Ramp-Up Time
1.0
1.0
–
–
20
10
V
= KA_V
= 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V
PWR
PWR
tCRES
Charge Pump Ramp-Up Time
= KA_V = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V
V
PWR
PWR
SENSOR SUPPLIES VREF1, VREF2
tDet
µs
V
Overcurrent Detection Time (see Figure 3)
REF
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
0.5
5.0
–
–
2.0
20
EN = 5.0 V, SNSEN = 5.0 V
tRet
ms
V
Retry Timer Delay (see Figure 3)
REF
V
Load RL = 5.0 Ω to GND, V
DDH
= 5.1 V, V
REF
PWR
EN = 5.0 V, SNSEN = 5.0 V
SUPERVISORY CIRCUITS
tD(PWROK)
tD(VKAMOK)
tD(VPWR)
5.0
10
–
–
–
15
30
10
ms
ms
ms
PWROK Delay Time (Power-On Reset) (see Figure 4)
VKAMOK Delay Time (see Figure 5)
1.0
V
Power-Up Delay Time (see Figure 6)
DDH
tFault
1.0
–
10
ms
Fault-Off Timer Delay Time (see Figure 7)
Notes
14. Guaranteed by design but not production tested.
33997
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Timing Diagrams
6.0
0
5.0
0
2.5V
t
SS
5.0
0
4.8V
TIME
Figure 2. Soft-Start Time
14
0
5.0
0
t
Det
4.0V
5.0
2.0V
2.0V
0
t
Ret
3.3
0
TIME
Figure 3. VREF Retry Timer
14
0
5.0
0
5.0
4.6V
t
D(PWROK)
0
3.3
0
TIME
Figure 4. PWROK Delay Timer (Power-On Reset)
33997
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Timing Diagrams (continued)
6.0
0
V
= 0V
PWR
5.0
0
3.3
1.25V
t
D(VKAMOK)
0
3.3
0
TIME
Figure 5. VKAMOK Delay Time
18
0
5.0
0
18
t
D(VPWR)
0
5.0
2.0V
0
TIME
Figure 6. VDDH Power-Up Delay Time
14
0
5.0
0
3.3
0
5.0
4.8V
4.8V
1.0V
1.0V
0
t
t
Fault
Fault
3.3
0
TIME
Figure 7. Fault-Off Timer Delay Time
33997
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SYSTEM/APPLICATION INFORMATION
INTRODUCTION
The 33997 multi-output power supply integrated circuit is
the integrated circuit. The 33997 also provides a 3.3 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.
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 3.3 V linear regulator uses an
external pass transistor, thus reducing the power dissipation of
FUNCTIONAL PIN DESCRIPTION
above 17 V are considered “double faults” and neither one of
the VREF outputs is protected against such conditions.
Switching Regulator V
DDH
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
Depending on the VDDH capacitor value and its ESR value,
the severity of the short may disrupt the VDDH operation.
Keep-Alive (Standby) Regulator V
KAM
The Keep-Alive Regulator VKAM (keep-alive memory) is
linear regulator VDDL and sensor supplies VREF1 and VREF2
.
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 3.3 V. A severe fault condition on the VKAM output is
The 33997 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
33997. 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
signaled by pulling the VKAMOK signal low.
(5.0 V nominal).
V
Keep-Alive Operation (Standby, Power-Down
KAM
3.3 V Linear Regulator V
DDL
Mode)
The 3.3 V linear post-regulator is powered from the 5.0 V
switching regulator output (VDDH). A discrete pass transistor is
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)
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.
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 V
and V
REF2
REF1
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
The sensor supplies are implemented using a protected
switch to the main 5.0 V (switching regulator) output. The
33997 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
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).
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
33997
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Power-On Reset Timer
(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).
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
Supervisory Circuits PWROK and VKAMOK
is compared to the internal bandgap reference voltage. When
The 33997 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
the VKAM falls below the bandgap reference voltage level, the
VKAMOK signal is pulled low.
33997
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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14
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APPLICATIONS
33997
V
= 5.0V
Lf1
L1
DDH
10uH
15uH
V
VSW
@ 1400mA total
PWR
4
9
R3
C3
68uF
C4
Cf1
Cf2
C1
C2
2.2R
D1
100nF
10 uF
1.0uF 100uF
1.0uF
Drive
I-lim
C8
390pF
Optional
Snubber
Ramp
Soft
FBKB
11
SUM
12
Logic
&
Start
Enb
Latch
V
Dp1
Osc
Cc1
Rc1
3.6k
2. 2nF
V
KA_V
bg
PWR
2
V
DDH
Dp2
15
Retry
Bandgap
DRVL
V
bg
3. 3V
Linear
Enb
Q1
Voltage
13
FBL
Reference
Snsenb
V
= 3.3V
DDL
Regulator
Driver
V
REF1
@ 400mA
Reg.
14
C5
100nF
C6
V
REF1
21
68uF
Enb
V
Cs1
V
= 3.3V
KAM
@ 10mA
V
3.3V
Standby
Reg.
KAM
33nF
Retry
POR
bg
24
C7
4.7uF
R1
R2
Snsenb
10k
10k
Snsenb
Enb
V
Enable
Control
REF2
Reg.
PWROK
10
V
REF2
16
VKAMOK
1
Cs2
PwrOK
VkamOK
Charge
Pump
33nF
C
3
SNSEN 22 EN 23
5-8 GND
17-20
RES
C9
22nF
Note The V
total output current is 1.4 A. This includes the current used by the linear regulator V
and buffered outputs V
and V
.
REF2
DDH
DDL
REF1
Figure 8. 33997 Application Circuit Schematic Diagram
Table 1. Recommended Components
Designator
Cf1
Value/Rating
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
Description/Part No.
Aluminum Electrolytic/UUB1H100MNR
Ceramic X7R/C1812C105K5RACTR
Aluminum Electrolytic/UUH1V101MNR
Tantalum/T494D686M010AS
Tantalum/T494D686M010AS
Tantalum/T494A475M010AS
Ceramic X7R
Manufacturer (Note 16)
Nichicon
Cf2, C2
C1
Kemet
Nichicon
C3 (Note 15)
C6
Kemet
Kemet
C7
Kemet
C4, C5
C8 (Optional)
C9
Any Manufacturer
Any Manufacturer
Any Manufacturer
Ceramic X7R
Ceramic X7R
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.
33997
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(Note 17)
Designator
Cs1, Cs2
Cc1
Value/Rating
33 nF/25 V
2.2 nF/16 V
10 kΩ
Description/Part No.
Ceramic X7R
Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Any Manufacturer
Ceramic X7R
R1, R2
R3 (Optional)
Rc1
Resistor 0805, 5%
Resistor 0805, 5%
Resistor 0805, 5%
2.2 Ω
3.6 kΩ
Lf1
10 µH
CDRH127-100M
or SLF10145-100M2R5
Sumida
TDK
L1
15 µH
CDRH127-150MC
or SLF10145-150M2R2
Sumida
TDK
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
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.
33997
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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
-A-
NOTES:
24
13
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.
-B- 12X P
M
M
0.010 (0.25)
B
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.
1
12
24X D
J
MILLIMETERS
INCHES
M
S
S
0.010 (0.25)
T A
B
DIM MIN
MAX
15.54
7.60
2.65
0.49
0.90
MIN
MAX
0.612
0.299
0.104
0.019
0.035
A
B
C
D
F
15.25
7.40
2.35
0.35
0.41
0.601
0.292
0.093
0.014
0.016
F
R X 45
°
G
J
K
M
P
R
1.27 BSC
0.050 BSC
0.23
0.13
0
0.32
0.29
8
0.009
0.005
0
0.013
0.011
8
C
K
-T-
SEATING
°
°
°
°
M
10.05
0.25
10.55
0.75
0.395
0.010
0.415
0.029
PLANE
22X G
33997
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NOTES
33997
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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NOTES
33997
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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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