Renesas ISL9237EVAL2Z User manual

USER’S MANUAL
UG075
Rev 3.00
November 4, 2016
ISL9237EVAL2Z
Evaluation Board User Guide
UG075 Rev 3.00 Page 1 of 17
November 4, 2016
Description
The ISL9237 is a buck-boost Narrow Output Voltage DC (NVDC)
charger utilizing Intersil’s advanced R3™ Technology to provide
high light-load efficiency, fast transient response, and
seamless DCM/CCM transitions for a variety of mobile and
industrial applications.
In Charge mode, the ISL9237 takes input power from a wide
range (4V to 20V) of DC power sources (conventional AC/DC
charger adapters, USB PD ports, travel adapters, etc.) and safely
charges battery packs with up to three cells in a series
configuration.
The ISL9237 supports On-the-Go (OTG) function for 2- and
3-cell battery applications. When OTG function is enabled, the
ISL9237 operates in Reverse Buck mode to provide 5V at the
USB port.
The ISL9237 has serial communication via SMBus/I2C that
allows programming of many critical parameters to deliver a
customized solution. These programming parameters include,
but are not limited to: adapter current limit, charger current
limit, system voltage setting, and trickle-charging current limit.
The ISL9237EVAL2Z evaluation board is designed to
demonstrate the performance of the ISL9237. The default
value numbers of the battery in series, the switching
frequency, and the adapter current limit charging function can
be programmed by the resistor from the PROG pin to GND.
Those values also can be set by SMBus.
Related Literature
• For a full list of related documents please visit our website
-ISL9237 product page
Key Features
• Buck-boost NVDC charger for 1-, 2-, 3-cell Li-ion batteries
• End of Charge (EOC) option
• System power monitor PSYS output, IMVP-8 compliant
• PROCHOT# open-drain output, IMVP-8 compliant
• Allows trickle charging of depleted battery
• Optional ASGATE FET control
• Ideal diode control in Turbo mode
• Reverse buck, boost, and buck-boost operation from battery
• Two-level adapter current limit available
• Battery Ship mode option
• SMBus and auto-increment I2C compatible
Specifications
•V
IN = 3.8V to 24V (no dead zone)
•V
OUT = 2.5V to 12.6V
•MAXI
charge up to 6A
•f
SW = 1MHz maximum
Ordering Information
PART NUMBER DESCRIPTION
ISL9237EVAL2Z ISL9237 buck-boost charger evaluation board
FIGURE 1. BLOCK DIAGRAM
ISL9237
BOOT1 PHASE1 UGATE1
VDDP
LGATE1 LGATE2 UGATE2 PHASE2
BOOT2
SCL
SDA
VBAT
CSOP
CSON
DCIN
VDD
COMP
PSYS
BGATE
ASGATE
PROCHOT#
ACIN
ACOK
GND
CSIP
CSIN
AMON/BMON
BATGONE
VADP
VBAT
VSYS
PROG
VSYS
OTGPG/CMOUT
ADP
OTGEN/CMIN
Q1
Q2
Q4
Q3
Rs1
Rs2
L1
OPTIONAL

UG075 Rev 3.00 Page 2 of 17
November 4, 2016
ISL9237EVAL2Z
Recommended Equipment
• 0V to 25V power supply with at least 6A source current capability
• Electronic load capable of sinking current up to 6A
• Battery emulator capable of sinking and sourcing current up to
6A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
NOTE: Customers can use a power supply (which can source but cannot
sink current) in parallel with an e-load Constant Current (CC) mode to
emulate the battery. For example, for charging, set the charging current
command lower than the CC mode e-load. If the e-load CC mode current
is set at 3A, the charge current command is 2A, then the e-load will take
2A from the charger and take another 1A from the power supply in
parallel with it. For discharging, the power supply is just like the battery to
discharge current. The user can also use the e-load Constant Voltage (CV)
mode to emulate the battery to take the charging current from the charger
and set the e-load CV voltage below the MaxSysV register setting, however,
this e-load CV mode cannot source current like a battery.
Software Requirement
The ISL9237 evaluation board needs to be used with the required
software. The ISL9237 evaluation kit software can be found on
our website.
ISL9237 evaluation kit software consists of the ISL9237
evaluation software, SMBus USB driver README file, and the
software installation guide.
Functional Description
The ISL9237EVAL2Z provides all circuits that are required to
evaluate the features of the ISL9237. A majority of the features
of the ISL9237, such as adjustable output voltage, On-the-Go
(OTG) mode, Trickle Charging mode for depleted battery, and
system power monitor at buck, Boost and Buck-Boost modes are
available on this evaluation board.
Quick Start Guide
The number of battery cell and adapter current limit default
values can be configured with a standard 1% 0603 resisor (R23)
from the PROG pin to GND. The “PROG PIN PROGRAMMING
OPTIONS” table in the ISL9237 datasheet shows the
programming options. After the default number of cells in series
are set, the default values for MaxSystemVoltage and
MinSystemVoltage are set accordingly. These values can also be
changed through the SMBus control registers, which are
implemented with the Intersil GUI, shown in Figure 2 on page 3.
Three LEDs are indicating ACOK, PROCHOT, and OTGPG/CMOUT
status, respectively. For more details about the functions of these
three pins, refer to the ISL9237 datasheet. Follow these steps to
evaluate the ISL9237 key functions,including system voltage
regulation, input current limit regulation, Charging mode, Trickle
Charging mode, and OTG mode. Figure 3, which is the top view of
the evaluation board, highlights the key testing points and
connection terminals. For other modes or more information
about ISL9237, please refer to the ISL9237 datasheet.
System Voltage Regulation
1. Set the power supply to 5V and, with the output disabled,
connect the (+) to J1 and the (-) end to J2.
2. Ensure jumpers JP3, JP4, and JP6 are shorted. SW1 and SW2
should switch to the low position.
3. Turn on the power supply, measure VSYS using the DMM
across (+) and (-) TP5. VSYS should read 8.38V. The current
meter on the supply should read <100mA. Increase VIN from
5V to 15V slowly. Monitor PH1 and PH2 to observe seamless
switching from Boost mode to Buck-Boost mode and finally
into Buck mode.
Input Current Limit Regulation
1. Keep VIN as a constant value between 3.8V and 24V. Set the
battery emulator voltage to 7.8V, connect the battery
emulator output to battery leads, J5 and J6. Then, turn on the
battery emulator; there is no charge and discharge current for
the battery, which is consistent to the BGATE signal of a high
voltage level.
2. Add an electrical load on VSYS and GND terminals, J3 and J4.
Turn on the load and increase the electrical load slowly; the
input current increases correspondingly and VSYS keeps
stable at 8.38V. The output voltage (VSYS) will start dropping
as the input current reaches the 1.5A input current limit. For
the input current limit details, refer to the ISL9237 datasheet.
If the VSYS voltage is 150mV lower than the battery voltage,
BGATE FET will turn on at a low voltage level, such that the
battery supplies the current to the load.

UG075 Rev 3.00 Page 3 of 17
November 4, 2016
ISL9237EVAL2Z
FIGURE 2. GUI SNAPSHOT
FIGURE 3. EVALUATION BOARD CONNECTION GUIDELINE
(+) SUPPLY
(-) SUPPLY
USB PORT
FOR SMBus
PH1 PH2 (+) DMM
(-) DMM
(+) BATTERY
(-) BATTERY
BGATE
LED 1, 2, 3
BATGONE
LEAD
LEAD
LEAD
LEAD
LEAD
LEAD

UG075 Rev 3.00 Page 4 of 17
November 4, 2016
ISL9237EVAL2Z
Charging Mode
1. Set the power supply to a constant value between 3.8V and
24V, then do Steps 1 and 2 in “System Voltage Regulation” on
page 2. Make sure the input current does not hit the limit.
2. Set the battery emulator voltage to 7.8V; connect the battery
emulator output to battery leads, J5 and J6.
3. Connect the USB cable at USB port for the SMBus; LED 1, 2,
and 3 are all lighting.
4. Turn on the power supply; LED 3 goes out. Then turn on the
battery emulator and open Intersil ISL9237 GUI (Figure 2 on
page 3). Note: The USB interface with a green tick means the
GUI is ready to communicate with the evaluation board. If the
USB interface shows a red cross, the GUI is not ready to
communicate with the evaluation board. Click the “reset USB”
button until a green tick shows in the USB interface. If not
green, check the USB connection.
5. Select “2 Cell” and click the “Write All” button, all controller
register values are set to the default values correspondingly.
The system voltage is 8.4V, which is the value of
MaxSystemVoltage in the GUI. There is no charge and
discharge current for battery. Change the
“ChargeCurrentLimit” from 0A to 2A then click the “Write”
button. The battery is now in a 2A current charge operation.
The charge current value can be monitored in the GUI by
clicking the “Read” button in the ChargeCurrentLimit column.
Monitor the BGATE signal status to confirm battery is in
Charging mode.
Note: Make sure the input current does not reach the input
current limit value, especially for a small VIN input.
Trickle Charging Mode
1. Do steps 1 through 5 in “Charging Mode”without any
changes.
2. Decrease the battery emulator voltage and monitor the
battery charging current. As long as the battery emulator
voltage is less than 5.2V (lower than SystemMinVoltage), the
battery enters trickle Charging mode and the charge current
decreases to 0.26A. The trickle-charge current value can be
changed through the SMBus control registers, refer to the
ISL9237 datasheet.
Note: Make sure the input current does not reach the input
current limit value, especially for small VIN input.
OTG Mode
1. Set the battery emulator voltage at a constant value between
5.8V and 15V; connect the battery leads, J5 and J6, with the
output disabled.
2. Connect electric load on supply leads, J1 and J2, with the
output disabled.
3. Connect the USB cable at the USB port for SMBus; only LED 1
light is on. Turn on the battery emulator and electrical load
without adding any load.
4. Open the Intersil ISL9237 GUI, The OTGVoltage is the voltage
value for load side, as shown in Figure 4 on page 5, and the
OTGCurrent is the OTG output current limit at load side. These
values can be set as needed by the customer, within the
output limit range. For their value range, please refer to the
ISL9237 datasheet.
5. Select the “Control1&2 registers” tab, enable the OTG
function at Control1 register, then click the “Write” button, as
shown in Figure 5 on page 5.
6. Switch SW2 on the evaluation board to the HI position; the
load voltage is regulated as an OTGVoltage value, set in
Figure 5, and the LED 3 light is on, which means the OTG
function is enabled.
7. Increase the electrical load slowly and monitor the load
voltage. As long as the load current is less than the
OTGCurrent limit value, the load voltage will be regulated at
the setting value.

UG075 Rev 3.00 Page 5 of 17
November 4, 2016
ISL9237EVAL2Z
FIGURE 4. OTG VOLTAGE AND CURRENT SETTING IN GUI
FIGURE 5. OTG FUNCTION ENABLE

UG075 Rev 3.00 Page 6 of 17 November 4, 2016
ISL9237EVAL2Z
ISL9237EVAL2Z Schematic
FIGURE 6. ISL9237EVAL2Z BOARD SCHEMATIC
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UG075 Rev 3.00 Page 7 of 17
November 4, 2016
ISL9237EVAL2Z
FIGURE 7. TOP OF BOARD
FIGURE 8. BOTTOM OF BOARD

UG075 Rev 3.00 Page 8 of 17
November 4, 2016
ISL9237EVAL2Z
Bill of Materials
MANUFACTURER PART QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER
ISL9237EVAL1ZREVBPCB 1 ea. SEE LABEL-RENAME BOARD PWB-PCB, ISL9237EVAL1Z, REVB, ROHS IMAGINEERING INC
C0603COG500-100KDE 1 ea. C43 CAP, SMD, 0603, 10pF, 50V, 10%, NP0,
ROHS
VENKEL
C0603X7R160102KNE 2 ea. C45, C82 CAP, SMD, 0603, 1000pF, 16V, 10%, X7R,
ROHS
VENKEL
GRM188R71E104KA01D 4 ea. C38, C84, C85, C86 CAP, SMD, 0603, 0.1µF, 25V, 10%, X7R,
ROHS
MURATA
GRM188R61E105KA12D 7 ea. C5, C6, C26, C31, C37, C81, C83 CAP, SMD, 0603, 1µF, 25V, 10%, X5R,
ROHS
MURATA
C1608X7R1E224K 2 ea. C30, C36 CAP, SMD, 0603, 0.22µF, 25V, 10%, X7R,
ROHS
TDK
C0603X7R160-472KNE 1 ea. C42 CAP, SMD, 0603, 4700pF, 16V, 10%, X7R,
ROHS
VENKEL
GRM188R71E473KA01D 1 ea. C46 CAP, SMD, 0603, 0.047µF, 25V, 10%, X7R,
ROHS
MURATA
C0603X5R100-475KNE 2 ea. C32, C33 CAP, SMD, 0603, 4.7µF, 10V, 10%, X5R,
ROHS
VENKEL
0 ea. C87 CAP, SMD, 0603, DNP-PLACE HOLDER,
ROHS
C2012X5R1E106K 17 ea. C7-C16, C18, C21, C22, C23,
C24, C40, C41
CAP, SMD, 0805, 10µF, 25V, 10%, X5R,
ROHS
TDK
16TQC68MYF 3 ea. C2, C3, C4 CAP-POSCAP, SMD, 7.3x4.3, 68µF, 16V,
20%, 50mΩ, ROHS
SANYO
PIMB063T-2R2MS-01 1 ea. L1 PWR CHOKE COIL, SMD, 6.95x6.6, 2.2µH,
10A, 20%, ROHS
CYNTEC CO., LTD.
111-0702-001 3 ea. J1, J3, J5 CONN-GEN, BIND.POST, INSUL-RED,
THMBNUT-GND
JOHNSON COMPONENTS
111-0703-001 3 ea. J2, J4, J6 CONN-GEN, BIND.POST, INSUL-BLK,
THMBNUT-GND
JOHNSON COMPONENTS
131-4353-00 2 ea. TP13, TP14 CONN-SCOPE PROBE TEST PT, COMPACT,
PCB MNT, ROHS
TEKTRONIX
5002 51 ea. TP1-TP12, TP15-TP37,
TP43-TP58
CONN-MINI TEST POINT, VERTICAL, WHITE,
ROHS
KEYSTONE
54819-0519 1 ea. J10 CONN-USB MINI-B RECEPTACLE, TH,
5CIRCUIT, R/A, ROHS
MOLEX
68000-236HLF 1 ea. JP6 CONN-HEADER, 1x3, BREAKAWY 1x36,
2.54mm, ROHS
BERG/FCI
69190-202HLF 3 ea. JP3, JP4, JP5 CONN-HEADER, 1x2, RETENTIVE, 2.54mm,
0.230x0.120, ROHS
BERG/FCI
SPC02SYAN 3 ea. JP3, JP4, JP6-Pins 1-2 CONN-JUMPER, SHORTING, 2PIN, BLACK,
GOLD, ROHS
SULLINS
1 ea. D1 DIODE-RECTIFIER, SMD, SOT23, 30V,
200mA, DUAL DIODE, ROHS
597-3311-407NF 3 ea. LED1, LED2, LED3 LED, SMD, 1206, GREEN, 75mW, 3mcd,
567nm, ROHS
DIALIGHT
C8051F320-GQ 1 ea. U2 IC-USB MICROCONTROLLER, 32P, LQFP,
PROGRAMMED, ROHS
SILICON LABORATORIES

UG075 Rev 3.00 Page 9 of 17
November 4, 2016
ISL9237EVAL2Z
ISL80101IRAJZ 1 ea. U3 IC-ADJ.V, 1A LDO REGULATOR, 10P, DFN,
3x3, ROHS
INTERSIL
ISL9237HRZ 1 ea. U1 IC-NOTEBOOK BATTERY CHARGER, 32P,
QFN, 4x4, ROHS
INTERSIL
2N7002-7-F 3 ea. Q8, Q9, Q10 TRANSISTOR, N-CHANNEL, 3LD, SOT-23,
60V, 115mA, ROHS
DIODES, INC.
SI7625DN-T1-GE3 3 ea. Q5, Q6, Q7
(ALT: SISS27DN-T1-GE3-T)
TRANSIST-MOS, P-CHANNEL, -30V, -35A,
8P, PWRPAK, ROHS
VISHAY
SISA14DN-T1-GE3 4 ea. Q1, Q2, Q3, Q4 TRANSISTOR-MOS, N-CHANNEL, 8P,
PWRPAK, 30V, 20A, ROHS
VISHAY
9C06031A2R00FGHFT 5 ea. R1, R2, R7, R10, R14 RES, SMD, 0603, 2Ω, 1/10W, 1%, TF,
ROHS
YAGEO
CR0603-10W-4R70FT 1 ea. R8 RES, SMD, 0603, 4.7Ω, 1/10W, 1%, TF,
ROHS
VENKEL
CR0603-10W-000T 18 ea. R4, R5, R6, R11, R12, R22, R24,
R40, R41, R42, R43, R84, R85,
R86, R89, R90, R91, R92
RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS VENKEL
ERJ-3EKF1001V 4 ea. R27, R83, R87, R88 RES, SMD, 0603, 1k, 1/10W, 1%, TF,
ROHS
PANASONIC
CR0603-10W-1002FT 6 ea. R15, R16, R36, R38, R39, R81 RES, SMD, 0603, 10k, 1/10W, 1%, TF,
ROHS
VENKEL
CR0603-10W-1003FT 6 ea. R13, R21, R28, R31, R44, R45 RES, SMD, 0603, 100k, 1/10W, 1%, TF,
ROHS
VENKEL
1 ea. R23 RES, SMD, 0603, 143k, 1/10W, 1%, TF,
ROHS
RC0603FR-07220RL 3 ea. R32, R33, R34 RES, SMD, 0603, 220Ω, 1/10W, 1%, F,
ROHS
YAGEO
ERJ-3EKF4023V 1 ea. R9 RES, SMD, 0603, 402k, 1/16W, 1%, TF,
ROHS
PANASONIC
ERJ-3EKF5621V 1 ea. R82 RES, SMD, 0603, 5.62k, 1/10W, 1%, TF,
ROHS
PANASONIC
CR0603-10W-6041FT 1 ea. R25 RES, SMD, 0603, 6.04k, 1/10W, 1%, TF,
ROHS
VENKEL
WSLP1206R0100FEA 1 ea. RS2 RES-CURR.SENSE, SMD, 1206, 0.01Ω, 1W,
1%, 75ppm, ROHS
VISHAY/DALE
WSLP1206R0200FEA 1 ea. RS1 RES-CURR.SENSE, SMD, 1206, 0.02Ω, 1W,
1%, 75ppm, ROHS
VISHAY/DALE
GT11MSCBE 2 ea. SW1, SW2 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS,
ON-NONE-ON, ROHS
ITT INDUSTRIES/C&K DIVISION
PMSSS 440 0025 PH 4 ea. Four corners SCREW, 4-40x1/4in, PHILLIPS, PANHEAD,
STAINLESS, ROHS
BUILDING FASTENERS
2204 4 ea. Four corners STANDOFF, 4-40x3/4in, F/F, HEX,
ALUMINUM, 0.25 OD, ROHS
KEYSTONE
0 ea. C1 DO NOT POPULATE OR PURCHASE
0 ea. JP1, JP2 DO NOT POPULATE OR PURCHASE
0 ea. L2 DO NOT POPULATE OR PURCHASE
0 ea. R3, R35, R37 DO NOT POPULATE OR PURCHASE
0 ea. TP38-TP42 DO NOT POPULATE OR PURCHASE
Bill of Materials (Continued)
MANUFACTURER PART QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER

UG075 Rev 3.00 Page 10 of 17
November 4, 2016
ISL9237EVAL2Z
0 ea. C19, C20, C25, C27, C28, C29,
C34, C35, C39, C44, C88-C97
DO NOT POPULATE OR PURCHASE
LABEL-DATE CODE 1 ea. AFFIX TO BACK OF PCB LABEL-DATE CODE_LINE 1: YRWK/REV#,
LINE 2: BOM NAME
INTERSIL
LABEL-RENAME BOARD RENAME PCB TO:
ISL9237EVAL2Z.
LABEL, TO RENAME BOARD INTERSIL
Bill of Materials (Continued)
MANUFACTURER PART QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER
PCB Layout Guidelines
PIN NUMBER PIN NAME LAYOUT GUIDELINES
BOTTOM PAD
33
GND Connect this ground pad to the ground plane through low impedance path. Recommend use of at least five vias to
connect to ground planes in PCB to ensure there is sufficient thermal dissipation directly under the IC.
1 CSON Run two dedicated traces with decent width in parallel (close to each other to minimize the loop area) from the two
terminals of the battery current-sensing resistor to the IC. Place the differential mode and common-mode RC filter
components in general proximity of the controller.
Route the current-sensing traces through vias to connect the center of the pads; or route the traces into the pads from
the inside of the current-sensing resistor. The following drawings show the two preferred ways of routing
current-sensing traces.
2CSOP
3 VSYS Signal pin. Provides feedback for the system bus voltage. Place the optional RC filter in general proximity of the
controller. Run a dedicated trace from system bus to the pin and do not route near the switching traces. Do not share
the same trace with the signal routing to the DCIN pin OR diodes.
4 BOOT2 Switching pin. Place the bootstrap capacitor in general proximity of the controller. Use decent wide trace. Avoid any
sensitive analog signal trace from crossing over or getting close.
5 UGATE2 Run these two traces in parallel fashion with decent width. Avoid any sensitive analog signal trace from crossing over
or getting close. Recommend routing PHASE2 trace to high-side MOSFET source pin instead of general copper.
The IC should be placed close to the switching MOSFET’s gate terminals and keep the gate drive signal traces short
for a clean MOSFET drive. The IC can be placed on the opposite side of the switching MOSFETs.
Place the output capacitors as close as possible to the switching high-side MOSFET drain and the low-side MOSFET
source; and use shortest PCB trace connection. Place these capacitors on the same PCB layer with the MOSFETs
instead of on different layers and using vias to make the connection.
Place the inductor terminal to the switching high-side MOSFET drain and low-side MOSFET source terminal as close
as possible. Minimize this phase node area to lower the electrical and magnetic field radiation but make this phase
node area big enough to carry the current. Place the inductor and the switching MOSFETs on the same layer of the
PCB.
6PHASE2
7 LGATE2 Switching pin. Run LGATE2 trace in parallel with UGATE2 and PHASE2 traces on the same PCB layer. Use decent
width. Avoid any sensitive analog signal trace from crossing over or getting close.
8 VDDP Place the decoupling capacitor in general proximity of the controller. Run the trace connecting to VDD pin with decent
width.
9 LGATE1 Switching pin. Run LGATE1 trace in parallel with UGATE1 and PHASE1 traces on the same PCB layer. Use decent
width. Avoid any sensitive analog signal trace from crossing over or getting close.
CURRENT-SENSING TRACES
VIAS
CURRENT-SENSING TRACES