ST EVAL-L9001 User manual

Introduction
EVAL-L9001 is a low cost tool designed to evaluate L9001, a smart power device designed by STMicroelectronics in advanced
BCD technology.
L9001 Simple Power Supply (SPS) device is a multiple output power regulator for automotive applications with one buck
regulator, one configurable buck or linear regulator and one linear regulator. Its output voltages are configurable via discrete
pins.
On top of the regulators, this device integrates a watchdog functional block, and a diagnosis functional block (under/over
voltage, output current and temperature).
Device is capable of low power operation mode with main regulators still active and reduced power consumption from battery.
EVAL-L9001 embeds a typical configuration for SPC5x microcontroller family supplying:
• Buck 5 V output for peripheral supply
• Buck 1.2 V output for core supply
• LDO 5 V output for ADC reference supply
The expansion connector allows to monitor the different diagnostic reset signal, to enable the regulator and, if activated, to
service the windows watchdog.
EVAL-L9001 evaluation board
UM2598
User manual
UM2598 - Rev 1 - June 2019
For further information contact your local STMicroelectronics sales office.
www.st.com

1Hardware description
EVAL-L9001 is intended as low cost tool with pre-defined configuration that exemplify a typical application of
L9001 as power supply for SPC5x family microcontroller. An optimized BOM for the proposed configuration has
been analyzed:
• All components are automotive grade (AEC-Q100)
• Dimensioning have been made taking into account the real application range and cost
Here below the main electrical characteristic of EVAL-L9001:
• Operative input voltage: 5.5 V – 18 V
• Output voltage in normal mode:
– VDD1 = 5 V ± 3%, 1 A
– VDD2 = 1.2 V ± 3%, 1 A
– VADC = 5 V ± 2%, 100 mA
• WD windows length: 40 ms ± 10%
• Wake input
• Standby input
• Reset signals on expansion connector
• Independent WD reset output
• Terminal available for wire soldering
• 50 x 50 mm 2 layers PCB
1.1 Block diagram
Figure 1. EVAL-L9001 block diagram
VDD1 reset
WDT
WAKE
Thermal reset
BATT 5.5 -18V
BATT
J4
WDI
STBY
WDO
WD
5V 1A
5V 0.1A
VDD1
Buck
LDO
logic
VADC
VDD2
Buck
Control
VADC reset
VDD2 reset
1.2V 1A
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Hardware description
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2L9001 block diagram
Figure 2. L9001 block diagram
VDDIO
VADC
ADCLDO
3.3V / 5.0V
100 mA
CONF3
WDI
WDT
GND (EP)
WAKE
VDD1 regulator
3,3V, 5V, 6V
1A
VS
V1O
VR1
VDD2 regulator
0,8V...5V
Buck2
1A
LDO2
300mA
V20
FB2
L9001
GND
RSTN2
CONF2
RSTN1
WDO
TWN
STBY
CP1 CP2 CP
VR2
CONF1
CONF1 = 0  VADC = 3,3V
CONF1 = Z  fail
CONF1 = 1  VADC = 5,0V
CONF3 = 0  VDD1 = 3,3V
CONF3 = Z  VDD1 = 5V
CONF3 = 1  VDD1 = 6V
ADCMON
CONF2 = 0  Buck 2 active
CONF2 = Z  fail
CONF2 = 1  LDO2 active
Diagnosis
Configuration
Voltage
monitor
Charge Pump
Stop
mode
Watchdog
Logic
Voltage
Monitor
Voltage
Monitor
Voltage
Monitor
bypass
bypass
GADG3103170733PS
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L9001 block diagram
UM2598 - Rev 1 page 3/15

3L9001 pin connection and description
Figure 3. L9001 pins connection diagram (top view)
CP
VS
V1O
WAKE
CONF3
RSTN2
VDDIO
RSTN1
ADCMON WDT
STBY
WDI
VADC
TWN
CONF2
CONF1
VR2
FB210
8
9
7
6
5
4
3
2
17
18
19
20
21
23
22
24
16
1
15
GND WDO
CP1
CP2 VR1
V2O
11
12
14
13
GADG3103170817PS
Table 1. L9001 pin description
Pin Number Pin Name Description Class I/O Type
EP GND Exposed pad: connected to GND Supply Global
1 GND Power GND Supply Global
2 ADCMON ADCLDO monitor (reset) O Local
3 RSTN1 VDD1 monitor (reset) O Local
4 RSTN2 VDD2 monitor (reset) O Local
5 VDDIO Input voltage reference Supply Local
6 CONF3 Configuration input 3 I Local
7 WAKE Wake-up input I Local
8 V1O VDD1 switching pin Supply Local
9 VS Battery supply voltage Supply Global
10 CP Charge pump output Supply Local
11 CP2 Charge pump capacitor pin 2 Supply Local
12 CP1 Charge pump capacitor pin 1 Supply Local
13 V2O BUCK2 switching pin/LDO2 output voltage Supply Local
14 VR1 VDD1 BYP output voltage /VDD2 supply pin Supply Global
15 FB2 VDD2 feedback voltage pin I Local
16 VR2 VDD2 BYP output voltage Supply Local
17 CONF1 Configuration input 1 I Local
18 CONF2 Configuration input 2 I Local
19 VADC ADCLDO output voltage Supply Global
20 TWN Thermal warning output flag O Local
21 WDI Watchdog input I Local
22 STBY Stand-by input I Local
23 WDT Watchdog timer input I/O Local
24 WDO Watchdog error flag output O Local
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L9001 pin connection and description
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4Board layout
Figure 4. TOP layer
Figure 5. BOTTOM layer
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Board layout
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Figure 6. Assembly TOP
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Board layout
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5Main components and connectors
Figure 7. Components and connectors details
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Main components and connectors
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6Jumpers and connectors
Table 2. Jumpers
Name Description Type
J1 Expansion connector (Enable signal, Reset signals,
Watchdog) Multi-pin connector
J2 Main battery positive connector (VB) Terminal
J3 VADC GND connector Terminal
J4 Watchdog disable
Solder jumper:
Closed (default) = Watchdog disabled
Open = Watchdog enabled
J5 VADC positive connector Terminal
J6 VDD1 positive connector Terminal
J7 VDD1 GND connector Terminal
J8 Main battery GND connector Terminal
J9 VDD2 GND connector Terminal
J10 VDD2 positive connector Terminal
Table 3. Expansion connector
Pin Description
1 ADCMON: VADC monitor flag (reset)
2 RSTN1: VDD1 monitor flag (reset)
3 RSTN2: VDD2 monitor flag (reset)
4 WAKE_EXT : Wake-up pin (to be > 3.25 V to enable power supply)
5WDO: Watchdog output (output is driven low
in case of watchdog fault)
6
STBY: Standby input (The state can be entered by ACTIVE state by rising STBY pin. Depending on the
active VDD regulators (i.e. the regulators which have not been disabled in the application), the low power
mode is managed in a different way). Please refer to L9001 Datasheet for further information
7 WDI: Windows watchdog input. Please refer to L9001 Datasheet for further information
8 TWN: Thermal warning flag output
9 GND : Ground
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Jumpers and connectors
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7Functional description
7.1 Default jumper setting
Table 4. Jumper configuration
Name Description Configuration
J4 Watchdog disable Soldered
7.2 Getting started
Make sure jumper [J4] is closed:
Figure 8. Jumper J4 detail
Step 1. Connect power supply positive output to [J2] and ground to [J8].
Step 2. Configure the power supply to 13.5 V and limit the current to 3 A
Step 3. Switch on the power supply
Step 4. Connect the Wake_ext ( pin 4 of expansion connector) to a voltage > 3.25 V
Step 5. Use a multimeter, in voltage measurement setting, to measure following voltages:
– 5 V between [J6 (+)] and [J7 (-)]
– 1.2 V between [J10 (+)] and [J9 (-)]
– 5 V between [J5 (+)] and [J3 (-)]
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Functional description
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8EVAL-L9001 board schematic
Figure 9. Board schematic
ADCMON
RSTN1
RSTN2
CONF3
CP
CP1
CP2
FB2
TWN
WDI
STBY
WDT
WDO
GND
GND
1VDD2
GND
1
VADC
Keep this loop short
close to the pin.
Keep this loop short
close to the pin.
1
J2
VB BOOT
C2
47uF/50V
GND
Imax = 3,5A
1
J8
GND
GND
1
GND
Use many vias over the GND planes
to freeze each other
C5
220nF/20V
C6
68nF/20V
BOOT
CP
1
BOOT
1
CP
1
CP2
1
CP1
CP2
CP1
Imax = 100mA Imax = 100mA
GND
Imax = 3,5A
GND
Imax = 3,5A
R4
10k/0,5%
FB21
FB2
GND
Close to chip GND pin
R20 1k
R10
1k C9
100nF/40V
GND
WAKE
1
WAKE
C11
47nF
GND
1
WDT
WDT
1
CONF1
1
CONF2
GND
R22 1k
1
WDI
R13
20k/0,5%
BOOT
C1
1uF
R15 10k
1
VDD1
C3
4,7uF/50V
C7
22uF/25V
C8
47uF/16V
1
J5
VADC
GND
1
RSTN2
4
VDDIO
5
ADCMON
2
RSTN1
3
CONF3
6
WAKE
7
V1O
8
VS
9
CP
10
CP2
11
CP1
12 V2O 13
VR1 14
FB2 15
VR2 16
CONF1 17
CONF2 18
WDO 24
WDT 23
STBY 22
WDI 21
TWN 20
VADC 19
EX-PAD
0
U1
L9001
GND
VDD1
VDD1
VDD2
VDD2
1
J10
VDD2
V2O
V2O
V1O
1
J6
VDD1
VDD2
1
CONF3
VS
VS
VS
VDDIO
R5
4.7k
VDDIO
R3
4.7k
VDDIO
R2
4.7k
R1
4.7k
R6
4.7k
VDDIO
V1O
VDDIO
VADC
VADC
ADCMON
RSTN1
RSTN2
WAKE_EXT
WAKE_EXT
1
VDDIO
1
STBY
1
V2O
1
V1O
1
VS
D1
STPS340B-TR
D2
STPS3L60SY
D3
STPS3L60SY
L1
10uH/4.9A
L3
10uH/2.6A
L2
22uH/4.6A
GND
C4
4,7uF/50V
1
J3
GND_ADC
GND
1
J7
GNDD1 1
J9
GNDD2
1
2
3
4
5
6
7
8
9
J1
CON9
GND
J4
Close
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UM2598
EVAL-L9001 board schematic