19-5773; Rev 0; 3/11
MAX16946 Evaluation Kit
General Description
The MAX16946 evaluation kit (EV kit) is an assembled
and tested PCB used to evaluate the MAX16946 high-
voltage, high-side, current-sense LDO/switch. The EV kit
demonstrates the device’s open-drain fault signals (OL,
SC),
open-load and current-limiting threshold-setting
inputs (OLT, LIM), LDO/switch operation and shutdown
function (SHDN), as well as the analog voltage output
(AOUT).
The EV kit comes with a MAX16946GTE/V+ installed,
which is the 16-pin TQFN package with an exposed pad.
S
4.5V to 18V Input Range
S
Tolerates Inputs Up to 45V
S
Resistor-Adjustable Open-Load and Current-Limit
Features
Evaluates: MAX16946
Threshold
S
Open-Drain, Open-Load Indicator Output (OL)
S
Open-Drain, Short-Circuit Indicator Output (SC)
S
Analog Current-Measurement Output
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
PART
MAX16946EVKIT#
#Denotes
RoHS compliant.
TYPE
EV Kit
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
22FF
Q50V
aluminum electrolytic
capacitor (8mm x 6.2mm)
Panasonic EEETG1H220P
0.1FF
Q10%,
50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H104K
1FF
Q10%,
25V X7R ceramic
capacitor (0805)
Murata GRM21BR71E105K
2.2FF
Q10%,
25V X7R ceramic
capacitors (1206)
TDK C3216X7R1E225K
15000pF
Q10%,
16V X7R
ceramic capacitor (0402)
Murata GRM155R71C153K
4700pF
Q10%,
50V X7R
ceramic capacitor (0603)
Murata GRM188R71H472K
33pF
Q5%,
50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H330J
Not installed, ceramic capacitor
(1206)
1FF
Q10%,
50V X7R ceramic
capacitor (0805)
Murata GRM21BR71H105K
DESIGNATION
D1
D2
D3
D4
IN, LIM, OLT,
OUT, REF,
SENS
JU1
JU2
JU3, JU4, JU5,
JU6
JU7
L1
L2, L3
P1
P2
Q1
R1
R2
QTY
1
1
1
1
DESCRIPTION
50V, 1A Schottky diode (SMA)
Diodes Inc. B150-13-F
Red LED (0805)
Yellow LED (0805)
30V, 1A Schottky diode
(SOD123)
ON Semi MBR130T1G
Test points, red
5-pin header
4-pin header
2-pin headers
3-pin header
1mH, 480mA inductor
(10.5mm x 10.3mm)
Sumida CDRH105RNP-102NC
Not installed, inductors (1206)
50I BNC
Not installed, BNC
npn prebiased transistor
(3 SOT23)
Diodes Inc. DDTC144ECA-7-F
0.5I
Q1%
resistor (1206)
10I
Q5%
resistor (0603)
C2, C3, C5,
C13, C14
5
C4
1
6
1
1
4
1
1
0
1
0
1
1
1
C6, C8
2
C7
1
C9
1
C10
1
C11
0
C12
1
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX16946 Evaluation Kit
Evaluates: MAX16946
Component List (continued)
DESIGNATION
R3
R4
R5
R6
R7, R9
R8
R10
R11
R12
R13, R14, R15
R16
QTY
1
1
1
1
2
1
1
1
1
3
1
DESCRIPTION
33kI
Q1%
resistor (0603)
86.6kI
Q1%
resistor (0603)
30.1kI
Q1%
resistor (0603)
18.7kI
Q1%
resistor (0603)
4.7kI
Q1%
resistors (0603)
33.2kI
Q1%
resistor (0603)
2.2kI
Q5%
resistor (0603)
4.7kI
Q5%
resistor (0603)
10kI
Q5%
resistor (0603)
100kI
Q5%
resistors (0603)
62kI
Q5%
resistor (0603)
DESIGNATION
SW1
U1
QTY
1
1
DESCRIPTION
Pushbutton switch
Current-sense LDO
(16 TQFN-EP)
Maxim MAX16946GTE/V+
General-purpose timer (8 SO)
Maxim ICM7555ESA+
5V LDO (8 SO-EP)
Maxim MAX15006BASA+
Shunts
PCB: MAX16946 EVALUATION
KIT
U2
U3
—
—
1
1
7
1
Component Suppliers
SUPPLIER
Diodes Incorporated
Murata Electronics North America, Inc.
ON Semiconductor
Panasonic Corp.
Sumida Corp.
TDK Corp.
PHONE
805-446-4800
770-436-1300
602-244-6600
800-344-2112
847-545-6700
847-803-6100
WEBSITE
www.diodes.com
www.murata-northamerica.com
www.onsemi.com
www.panasonic.com
www.sumida.com
www.component.tdk.com
Note:
Indicate that you are using the MAX16946 when contacting these component suppliers.
Quick Start
• MAX16946 EV kit
• Load
• Two voltmeters
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn
on power supply until all connections are completed.
1)
2)
Verify that all jumpers are in their default position, as
shown in Table 1.
Adjust the power supply to 10V.
3)
4)
5)
6)
Adjust the load to 30mA.
Connect the power supply between the VIN and
GND PCB pads on the EV kit.
Connect the load between the REG_OUT and GND
PCB pads on the EV kit.
Connect the first voltmeter between the REG_OUT
and GND PCB pads on the EV kit.
Connect the second voltmeter between the AOUT
and GND PCB pads on the EV kit.
Enable the power supply and the load.
Verify that the first voltmeter displays 5V.
Required Equipment
• 18V, 200mA DC power supply
Procedure
7)
8)
9)
10) Verify that the second voltmeter displays 790mV.
2
______________________________________________________________________________________
MAX16946 Evaluation Kit
Evaluates: MAX16946
Table 1. Jumper Descriptions (JU1–JU7)
JUMPER
SHUNT
POSITION
1-2*
1-3
1-4
1-5
1-2
JU2
1-3*
1-4
JU3
JU4
1-2*
Open
1-2
Open*
1-2*
Open
1-2*
JU6
Open
1-2
JU7
2-3*
DESCRIPTION
Connects the FB pin of the device to the resistor-divider of R6 and R7, which sets the output
voltage to 5V. JU3 must be installed for proper output.
Connects the FB pin of the device to the resistor-divider of R8 and R9, which sets the output
voltage to 8V. JU4 must be installed for proper output.
Connects the FB pin of the device to GND, which configures the device as a switch.
Connects the FB pin of the device to the REG pin of the device, which sets the output voltage
to 8.5V.
Connects the
SHDN
pin of the device to the input voltage of the device for normal operation.
Connects the on-board pulse generator to the
SHDN
pin of the device, which allows the
OL
output to be cleared.
Connects the
SHDN
pin of the device to ground for shutdown mode.
Sets the output voltage to 5V. JU1 must be installed in the 1-2 position for proper output.
Disconnects the resistor-divider of R6 and R7 when JU1 is not in the 1-2 position.
Sets the output voltage to 8V. JU1 must be installed in the 1-3 position for proper output.
Disconnects the resistor-divider of R8 and R9 when JU1 is not in the 1-3 position.
Powers U3 by connecting the voltage supply that was applied at the VIN PCB pad on the
EV kit.
User can apply an external supply to the pin of JU5 that is connected to U3.
Connects 5V pullup voltage for
OL
and
SC
(LEDs D2 and D3).
LEDs D2 and D3 not used. The
SC
and
OL
PCB pads of the EV kit are used to monitor fault
signals.
Connects the output pulse of U2 to pin JU2-3. JU2 must be in the 1-3 position for proper
operation.
Connects the output pulse of Q1 to pin JU2-3. JU2 must be in the 1-3 position for proper
operation.
JU1
JU5
*Default
position.
_______________________________________________________________________________________
3
MAX16946 Evaluation Kit
Evaluates: MAX16946
Detailed Description of Hardware
The MAX16946 EV kit is an assembled and tested PCB
used to evaluate the MAX16946 high-voltage, high-side,
current-sense LDO/switch. The EV kit operates from a
4.5V to 18V DC supply voltage. The EV kit demonstrates
the device’s open-drain fault signals (OL,
SC),
open-load
and current-limiting threshold-setting inputs (OLT, LIM),
LDO/switch operation and shutdown function (SHDN), as
well as the analog voltage output (AOUT).
The EV kit provides LEDs D2 and D3 to facilitate the
monitoring of the short-circuit, open-drain and open-load
fault signals, respectively. The open-load threshold-
setting input is set to approximately 16mA and the
current-limiting threshold is set to approximately 150mA.
The short-circuit detection threshold is set by 0.5I (R1)
to 100mA. An on-board LDO (U3) is provided to support
single-supply evaluation. The LDO is powered by the
input voltage (VIN) and provides a 5V output used to
power the fault indicator and pulse generator (U2).
The EV kit includes LED D2 to monitor the short-circuit
fault signal and D3 to monitor the open-load fault signal.
Both LED networks are driven by the on-board 5V LDO
(U3). To monitor the indicator outputs by external means,
remove the shunt from JU6 and connect the monitor sys-
tem to the
OL
and
SC
PCB pads on the EV kit. Ensure
that the monitoring system provides pullup resistors on
the
OL
and
SC
open-drain indicator output signals.
The open-load threshold setting is configured by the
resistor-divider between the device’s REF and OLT pins
and is set to 16mA by default.
When the shunt of JU1 is in the 1-2 position, the shunt of
JU3 is installed, and the shunt of JU4 is not installed, the
device is set as a 5V LDO through the resistor-divider of
R6 and R7. When the shunt of JU1 is in the 1-3 position,
the shunt of JU3 is not installed, and the shunt of JU4
is installed, the device is set as an 8V LDO through the
resistor-divider of R8 and R9. To set the output to 8.5V,
the shunt of JU1 must be in the 1-5 position, which con-
nects the FB pin to REG.
The device is a switch when the shunt of JU1 is in the
1-4 position, which connects the FB pin to ground. The
voltage applied at the input is approximately the voltage
at the output.
When the
SHDN
pin is pulled high, the EV kit is in normal
operation. The EV kit can enter shutdown by placing the
shunt of JU2 in the 1-4 position.
LDO
Switch
Shutdown (SHDN)
Open-Drain Fault Signals (OL,
SC)
Once the open load is detected, the
OL
output latches
low and the output voltage stays on. To unlatch the open-
load indicator (OL back to high), place the shunt of JU2
in the 1-3 position and press the SW1 switch to apply
a pulse less than 150Fs at the
SHDN
pin of the device.
Pulse Generator
Open-Load Threshold
4
______________________________________________________________________________________
MAX16946 Evaluation Kit
Evaluates: MAX16946
Figure 1. MAX16946 EV Kit Schematic
_______________________________________________________________________________________
5
