MAX5092B [MAXIM]
fully assembled and tested surface-mount printed-circuit board;
| 型号： | MAX5092B |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | fully assembled and tested surface-mount printed-circuit board |
| 文件： | 总8页 (文件大小：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1018; Rev 0; 10/07
MAX5092 Evaluation Kit
Evluates:2MX50B/93A
General Description
Features
♦ Wide 4V to 72V Input-Voltage Range
♦ Preset 5V LDO Output Voltage
♦ Preset 7V Boost Preregulator Output Voltage
♦ Adjustable LDO Output Voltage from 1.5V to 9V
The MAX5092 evaluation kit (EV kit) is a fully assembled
and tested surface-mount printed-circuit board (PCB)
demonstrating the MAX5092B, a low-dropout (LDO) reg-
ulator with internal boost preregulator. The EV kit oper-
ates from a 4V to 72V input voltage and delivers up to
250mA from a preprogrammed 7V boost preregulator
output (BSOUT) and 5V LDO output (VOUT). Both the
LDO and the boost preregulator output voltages are pro-
grammable using external resistors.
♦ Adjustable Boost Preregulator Output Voltage Up
to 11V
♦ Jumper-Programmable ENABLE and HOLD
The MAX5092 EV kit features include on-board jumper
settings that allow for evaluation of the ENABLE and
HOLD functions of the MAX5092, a power-on-reset out-
put (RESET) to indicate LDO out-of-regulation condi-
tions, and a programmable RESET time period.
Functions
♦ Programmable HOLD Time Period
♦ Surface-Mount Components
♦ Lead-Free Evaluation Kit
The MAX5092 EV kit can be configured to demonstrate
the MAX5092A (3.3V LDO output) or the MAX5093A/
MAX5093B. To evaluate the MAX5092A, replace the IC
with the MAX5092A. To evaluate the MAX5093_, the
addition of an external Schottky diode is required. See
the Configuring for the MAX5093_ section to modify the
MAX5092 EV kit for the MAX5093_.
♦ Fully Assembled and Tested
Ordering Information
The EV kit comes fully assembled and tested, is quali-
fied lead-free, and is rated for an operating temperature
range of 0°C to +70°C.
PART
TYPE
MAX5092EVKIT+
EV Kit
+Denotes lead-free and RoHS-compliant.
Warning: The MAX5092 EV kit is designed to operate
with high voltages. Dangerous voltages can be present
on this EV kit and on equipment connected to it. Users
who power up this EV kit, or the power sources con-
nected to it, must be careful to follow safety procedures
appropriate when working with high-voltage electrical
equipment.
Note: To evaluate the MAX5092A, request a MAX5092AATE+
free sample with the MAX5092EVKIT+. To evaluate the
MAX5093_, request a MAX5093AATE+/MAX5093BATE+ free
sample with the MAX5092EVKIT+.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
1µF 10ꢀ, 1ꢁV X7R ceramic
capacitor (0ꢁ03)
47µF, 80V, 0.7Ω SMT Al electrolytic
capacitor (G)
Cꢁ
1
C1
1
TDK 1ꢁ08X7R1C105K or equivalent
Panasonic EEEFK1K470P
10µF 10ꢀ, 25V X5R ceramic
capacitor (120ꢁ)
Murata GRM31CRꢁ1E10ꢁK or
equivalent
1µF 10ꢀ, 100V X7R ceramic
capacitors (1210)
Murata GRM32CR72A105K or
equivalent
C7
C8
D1
1
0
0
C2, C3
2
Not installed, ceramic capacitor (0ꢁ03)
22µF, 80V, 1.3Ω SMT Al electrolytic
capacitor (F)
Panasonic EEEFK1K220P
C4
C5
1
1
Not installed (SMB)
Recommended diode: 2A, 100V
Schottky diode
0.22µF 10ꢀ, 1ꢁV X7R ceramic
capacitor (0ꢁ03)
Diodes Inc. B2100 or equivalent
TDK C1ꢁ08X7R1C224K or equivalent
________________________________________________________________ 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.
MAX5092 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
3-pin headers
3ꢁ-pin headers, 0.1 centers
(comes in 3ꢁ-pin strips, cut to fit)
Sullins PEC3ꢁSAAN
DESIGNATION QTY
DESCRIPTION
0Ω resistors (0ꢁ03)
R2, R5
R3
2
1
100kΩ 5ꢀ resistor (0ꢁ03)
JU1, JU2
2
MAX5092BATE+
(1ꢁ-pin, 5mm x 5mm, Thin QFN)
U1
1
Digi-Key S1012E-3ꢁ-ND
Shunt
Sullins STC02SYAN
Digi-Key S9000-ND
4.7µH, 4.8A 18mΩ inductor
(9.4mm x 12.95mm x 5.21mm)
Coilcraft DO331ꢁP-472ML
—
—
2
1
L1
1
0
PCB: MAX5092 Evaluation Kit+
R1, R4
Not installed (0ꢁ03)
Component Suppliers
SUPPLIER
COMPONENTS
Inductors
PHONE
WEBSITE
www.coilcraft.com
Coilcraft, Inc.
Digi-Key
847-ꢁ39-ꢁ400
800-344-4539
770-43ꢁ-1300
714-373-73ꢁꢁ
7ꢁ0-744-0125
888-835-ꢁꢁ4ꢁ
Headers, jumpers
Capacitors
www.digikey.com
Murata Mfg. Co., Ltd.
Panasonic Corp.
Sullins Electronics
TDK Corp.
www.murata.com
Resistors, capacitors
Headers, jumpers
Capacitors
www.maco.panasonic.co.jp
www.sullinselectronics.com
www.component.tdk.com
Note: Indicate that you are using the MAX5092A, MAX5092B, MAX5093A, or MAX5093B when contacting these component suppliers.
1) Preset PS1 to +4V. Turn off PS1. Caution: Do not
turn on the power supply until all connections are
complete.
2) Connect the positive terminal of PS1 to the VIN pad
located on the EV kit. Connect the negative terminal
of PS1 to the GND pad located on the EV kit.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
•
One variable-DC power supply (further referred to
as PS1) capable of supplying up to 72V at 1A
•
•
•
One adjustable load capable of sinking 250mA at 5V
Three digital voltmeters (DVMs)
3) Connect the positive input of one DVM to the VIN
pad located on the EV kit. Connect the negative
input of that DVM to the GND pad located on the EV
kit. This DVM measures the EV kit input voltage.
One ammeter (for optional low-quiescent input cur-
rent evaluation)
Evluates:2MX50B/93A
4) Connect the positive input of the second DVM to
the BSOUT pad located on the EV kit. Connect the
negative input of that DVM to the GND pad located
on the EV kit. This DVM measures the output volt-
age at the boost converter output.
Procedure
The MAX5092 EV kit is fully assembled and tested.
Follow the steps below to verify board operation. See
Figure 1 for test setup.
Warning: The MAX5092 EV kit is designed to operate
with high voltages. Dangerous voltages can be present
on this EV kit and on equipment connected to it. Users
who power up this EV kit, or the power sources connected
to it, must be careful to follow safety procedures appropri-
ate when working with high-voltage electrical equipment.
5) Connect the positive input of the third DVM to the
VOUT pad located on the EV kit. Connect the nega-
tive input of that DVM to the GND pad located on
the EV kit. This DVM measures the output voltage at
the LDO output.
2
_______________________________________________________________________________________
MAX5092 Evaluation Kit
Evluates:2MX50B/93A
ꢁ) Connect dummy load between the VOUT and GND
pads located on the EV kit. Adjust the load to 250mA.
over the input-voltage range. Verify that the VOUT
DVM indicates approximately 5V over the input-volt-
age range.
7) Verify that a shunt is installed on pins 2-3 of jumper
JU1 to enable the MAX5092B.
13) Optional procedure to observe the MAX5092 low-
quiescent input current (I ):
Q
8) Verify that a shunt is installed pins 2-3 of jumper
JU2 to disable the HOLD function of the
MAX5092B.
a) Set the PS1 voltage to 14V. The boost converter
is not switching.
9) Turn on PS1 and sweep the input voltage from 4V to
7V to 3.5V as indicated on the input DVM. Verify
that the BSOUT DVM indicates approximately 7V
over the input-voltage range. Verify that the VOUT
DVM indicates approximately 5V over the input-volt-
age range. Note that the MAX5092 still properly
regulates the outputs with VIN as low as 3.5V after
the IC is started.
b) Turn off PS1. Caution: Do not turn on the power
supply until all connections are complete.
c) Remove the load from VOUT.
d) Remove all the DVMs to eliminate the DVM con-
tribution to I .
Q
e) Remove the wire between PS1 and the VIN pad
on the EV kit.
10) Reduce the dummy load to 10mA.
11) Increase PS1 to 7V.
f) Connect the positive terminal of PS1 to the posi-
tive terminal of the ammeter. Connect the nega-
tive terminal of this ammeter to the VIN pad
12) Warning: Dangerous voltages are present on the
EV kit during this step. Sweep the PS1 voltage
from 7V to 72V. Verify that the BSOUT DVM voltage
follows the input DVM voltage, minus a diode drop,
located on the EV kit. This ammeter measures I .
Q
g) Turn on PS1. Observe that the ammeter indicates
an I less than 85µA.
Q
*FOR OPTIONAL I TEST,
Q
REPLACE THE WIRE
BETWEEN PS1 AND VIN
WITH AN AMMETER.
DVM2
A
VIN
BSOUT
GND
GND
DC
POWER SUPPLY
(PS1)
ADJUSTABLE
LOAD
GND
MAX5092 EV KIT
VOUT
DVM1
DVM3
Figure 1. MAX5092 EV Kit Test Connections
_______________________________________________________________________________________
3
MAX5092 Evaluation Kit
Detailed Description
Table 1. JU1 and JU2 Jumper Positions
The MAX5092 evaluation kit (EV kit) is a fully assem-
bled and tested surface-mount PCB demonstrating
the MAX5092B LDO with internal boost preregulator
IC. The EV kit operates from a 4V to 72V input voltage
and delivers up to 250mA from a preprogrammed 7V
boost preregulator output (BSOUT) and 5V LDO out-
put (VOUT).
JUMPER
POSITION
FUNCTION
1-2
Sets ENABLE low (disables IC)
Sets ENABLE high (enables IC)
JU1
2-3
1-2
Sets HOLD low (enables HOLD
)
JU2
2-3
Sets HOLD high (disables HOLD
)
VOUT can deliver up to 250mA total output current.
The voltage maintained at BSOUT depends upon the
input voltage and the programmed BSOUT regulation
MAX5092B/MAX5093A/MAX5093B data sheet for a
more detailed description of the ENABLE and HOLD
timing functions.
voltage. When (V
- V
) is less than the boost
BSOUT
OUT
The MAX5092 contains a power-on-reset output
(RESET) that indicates when the LDO output voltage
disable threshold (2.5V typ), V
programmed regulation voltage. As V
above the BSOUT regulation voltage, causing
is boosted to its
VIN
BSOUT
increases
(V
) is out of regulation. If V
falls below 90ꢀ
VOUT
VOUT
of the programmed regulation threshold, V
low after a short timeout period. Once V
pulls
rises
RESET
VOUT
(V
- V
) to be greater than the boost disable
BSOUT
BST_OUT
threshold, V
OUT
follows V , minus a diode drop.
VIN
above 92ꢀ of the programmed regulation threshold,
goes high after the user-programmable timeout
Both the LDO and boost preregulator output voltages
can be programmed using external resistors. The boost
V
RESET
period. Capacitor C5 sets the RESET timeout period.
See the Adjusting the RESET Timeout Period section
for more details.
output voltage (V
) is adjustable up to 11V by
BSOUT
selecting resistors R1 and R2. The LDO output voltage
(V ) is adjustable from 1.5V to 9V by selecting
VOUT
The MAX5092A IC (3.3V LDO output) can be used with
this EV kit. Refer to the MAX5092/MAX5093 IC data
sheet for operation. The MAX5092 EV kit can be config-
ured for the MAX5093_ IC using an external Schottky
diode. Use the MAX5093_ for higher boost voltage
applications up to 12V or to lower package power dissi-
pation. See the Configuring for the MAX5093_ to modify
the MAX5092 EV kit for use with the MAX5093_.
resistors R4 and R5. See the Evaluating Other Output
Voltages section for more details. If it is desired to pro-
gram V
to voltages up to 12V, use the MAX5093_
BSOUT
IC. See the Configuring for the MAX5093_ section for
more details.
The MAX5092_/MAX5093_ feature an internal voltage
regulator that is used to supply all internal low-voltage
blocks within the IC. An output on the EV kit (VL) is pro-
Customizing the MAX5092 EV Kit
vided to monitor the internal regulator voltage. V reg-
VL
ulates to 5.5V when V
is above 5.5V. V tracks
BSOUT
VL
Evaluating Other Output Voltages
the voltage at BSOUT when V
is below 5.5V. VL
BSOUT
Setting the Boost Output Voltage (V
)
BSOUT
is not intended to supply an external load.
The MAX5092_/MAX5093_ feature Dual Mode™ opera-
tion for regulating the boost-converter output voltage.
These devices operate in either preset output-voltage
mode or adjustable output-voltage mode. In preset
The MAX5092 EV kit utilizes two jumpers (JU1 and JU2)
to control the ENABLE and HOLD functions of the
MAX5092 IC. See Table 1 for jumper descriptions. Shunt
pins 2-3 of jumper JU1 to enable the MAX5092. Shunt
pins 1-2 of jumper JU1 to disable the MAX5092. Shunt
pins 1-2 of jumper JU2 to enable HOLD mode. Shunt
pins 2-3 of jumper JU2 to disable HOLD mode. Enabling
HOLD prevents the IC from shutting down if EN is
brought low. The ENABLE function is also controlled by
an external voltage source by connecting the external
source to the ENABLE pad on the EV kit. When control-
ling ENABLE from an external source, ensure the shunt
on jumper JU1 is removed. Refer to the MAX5092A/
mode, internal trimmed feedback resistors set V
BSOUT
to a fixed 7V. The default EV kit is configured for the
BSOUT preset mode by directly connecting BSFB to
Evluates:2MX50B/93A
SGND (Figure 2). In adjustable output mode, V
BSOUT
can be programmed up to 11V for the MAX5092_ (or
up to 12V for the MAX5093_) by selecting resistors R1
and R2. Note that the current drawn by these resistors
adds to the quiescent current and the shutdown current
of the IC. Use the adjustable output mode only if
V
is required to be significantly different than the
BSOUT
Dual Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
4
MAX5092 Evaluation Kit
Evluates:2MX50B/93A
preset 7V. If V
is programmed greater than
BSOUT
Adjusting the RESET Timeout Period
The MAX5092 EV kit contains an open-drain power-on
reset output (RESET) that indicates when the LDO out-
(V
+ V
), larger ripple is observed on
OUT
BST_DIS
BSOUT. The reason is that as V
rises above
BSOUT
(V
+ V
), the boost converter is disabled,
OUT
causing V
BST_DIS
put (VOUT) is out of regulation. When V
rises
goes
VOUT
RESET
to fall. As V
falls to (V
+
OUT
BSOUT
BSOUT
above 92ꢀ of the regulation threshold, V
V
V
V
), the boost converter turns back on and
BST_EN
BSOUT
BSOUT
high after a user-programmable timeout period. This
time period is programmable by selecting the capaci-
tance of capacitor C5 (Figure 2). For a chosen RESET
rises. For the lowest V
ripple, program
BSOUT
within the boost disable threshold.
active timeout period (t
) in seconds, calcu-
RESET_HIGH
late the required C5 value in farads as:
To program V
for other voltages, use the follow-
BSOUT
ing procedure:
1) Select a R2 resistance of 499kΩ or lower.
−ꢁ
2×10 × t
RESET_HIGH
C5 =
2) Calculate R1 using the following equation:
1.24
V
BSOUT
1.24
The RESET active timeout period is set for approxi-
mately 13ꢁms by C5 in the default EV kit configuration.
R1=R2×(
−1)
Configuring for the MAX5093_
The MAX5092 EV kit can be configured to demonstrate
the MAX5093_. The MAX5093_ requires an external
switching diode (D1) connected between LX and
BSOUT (Figure 2). Proper selection of an external
diode can offer a lower forward-voltage drop and a
higher reverse-voltage handling capability. Since the
high-switching frequency of the IC demands a high-
speed rectifier, Schottky diodes are recommended for
most applications because of their fast recovery time
and low forward-voltage drop. Ensure that the diode’s
peak current rating is greater than or equal to the peak
inductor current. Additionally, the diode reverse break-
where V
is the desired output voltage for BSOUT.
BSOUT
3) Remove the short located at R2.
4) Install resistors R1 and R2.
See Figure 2 for the MAX5092 EV kit schematic.
Setting the LDO Output Voltage (VOUT)
LDO output-voltage regulation also features Dual Mode
operation. In preset mode, V
regulates to 3.3V
VOUT
(MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B)
by internal trimmed feedback resistors. The default EV
kit VOUT regulation mode is configured for the preset
mode by directly connecting SET to SGND (Figure 2).
V
can also be adjusted from 1.5V to 9V for the
VOUT
down voltage must be greater than V
.
BSOUT
MAX5092_ (or from 1.5V to 10V for the MAX5093_) by
selecting resistors R4 and R5. Note that the current
drawn by these resistors adds to the quiescent current
of the LDO. Use the adjustable output mode only if
To configure the MAX5092 EV kit for use with the
MAX5093_, perform the following procedure:
1) Replace the MAX5092B IC with the MAX5093_ IC.
V
is required to be significantly different than the
VOUT
2) Install Schottky diode D1. See the Component List
for recommended diode.
preset voltage. To program V
use the following procedure:
for other voltages,
VOUT
3) Configure the BSOUT and VOUT voltages as dis-
cussed in the Evaluating Other Output Voltages
section.
1) Select an R5 resistance of 100kΩ or lower.
2) Calculate R4 using the following equation:
V
1.24
VOUT
R4 =R5×(
−1)
where V
is the desired output voltage for VOUT.
VOUT
3) Remove the short located at R5.
4) Install resistors R4 and R5.
See Figure 2 for the MAX5092 EV kit schematic.
_______________________________________________________________________________________
5
MAX5092 Evaluation Kit
L1
D1
4.7μH
OPEN
10
LX
11
LX
C8
OPEN
1
14
VIN
4V TO 72V
VL
IN
VL
C2
1μF
C1
47μF
C6
1μF
U1
MAX5092B
GND
BSOUT
7V
9
BSOUT
VOUT
C4
22μF
C3
1μF
R3
100kΩ
R1
OPEN
12
13
PGND_BST
BSFB
16
RESET
RESET
R2
0Ω
JU1
3
2
1
4
2
3
HOLD
ENABLE
EN
3
1
2
JU2
VOUT
SGND
7
8
OUT_SENSE
OUT
VOUT
5V AT 250mA
C7
10μF
15
R4
OPEN
CT
5
6
PGND_LDO
SET
C5
0.22μF
P
EP
R5
0Ω
P
Figure 2. MAX5092B EV Kit Schematic
Evluates:2MX50B/93A
6
_______________________________________________________________________________________
MAX5092 Evaluation Kit
Evluates:2MX50B/93A
Figure 3. MAX5092EV Kit Component Placement Guide—Top
Silkscreen
Figure 4. MAX5092 EV Kit PCB Layout—Solder Side Top
Figure 5. MAX5092 EV Kit PCB Layout—AGND Inner Layer 2
_______________________________________________________________________________________
7
MAX5092 Evaluation Kit
Figure ꢁ. MAX5092 EV Kit PCB Layout—PGND Inner Layer 3
Figure 7. MAX5092 EV Kit PCB Layout—Solder Side Bottom
Evluates:2MX50B/93A
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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