MAX1894EVKIT [MAXIM]
Evaluation Kits for the MAX1894/MAX1924 ; 评估套件为MAX1894 / MAX1924\n
| 型号： | MAX1894EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kits for the MAX1894/MAX1924
|
| 文件： | 总6页 (文件大小：156K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2508; Rev 0; 7/02
MAX1894/MAX1924 Evaluation Kit
General Description
Features
ꢀ Protects Against Cell Overvoltage
ꢀ Protects Against Cell Undervoltage
The MAX1894 evaluation kit (EV kit) is a fully assembled
and tested circuit board. It uses the MAX1894 lithium-
ion (Li+) battery-pack protector to protect four series
Li+ cell battery packs against overvoltage, undervolt-
age, excessive charge/discharge currents, and battery
pack-short conditions. Three external P-channel
MOSFETs control the charge and discharge paths of
the battery pack. The MAX1894 EV kit provides two
inputs, which can be used by a microcontroller (µC) to
control the protection MOSFETs or put the MAX1894 in
shutdown mode. The EV kit also evaluates the MAX1924.
ꢀ Protects Against Excessive Charge/Discharge
Currents and Pack-Short Conditions
ꢀ 0.8µA (typ) Shutdown Supply Current Prevents
Deep Discharge of Cells
ꢀ Low Operating Supply Current, 30µA (typ)
ꢀ Small 16-Pin QSOP Package
ꢀ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
IC PACKAGE
MAX1894EVKIT
0°C to +70°C
16 QSOP
Component List
DESIGNATION
J1% J±
QTY
DESCRIPTION
Nonisolated banana jacks
ꢁ-pin headers
DESIGNATION
QTY
DESCRIPTION
±
ꢁ
±
4.7µF ±±20% ꢀ.ꢁ3 ꢂ7ꢃ
ceramic capacitor (2825)
Taiyo Yuden JMK±1±BJ475MG
JU1% JU±% JUꢁ
JU4% JU5
C1
1
±-pin headers
-2.1ꢁA% -523% P-channel MOSFET%
SOT±ꢁ
Fairchild Semiconductor BSS84
2.1µF ±120% 523 ꢂ7ꢃ
ceramic capacitors (2825)
Taiyo Yuden UMK±1±BJ124KG
P1
1
C±% C1±
Cꢁ% C4
C5
±
2
1
ꢁ
1
8A% -ꢁ23% P-channel MOSFETs %
8-pin SO
3ishay Siliconix Si44ꢁ5DY or
International ꢃectifier Si44ꢁ5DY
2.1µF to 1µF ±±20% 523 ꢂ7ꢃ
ceramic capacitors (2825)%
not installed
P±% Pꢁ
±
1µF ±120% ꢀ.ꢁ3 ꢂ5ꢃ
ceramic capacitor (2ꢀ2ꢁ)
TDK C1ꢀ28ꢂ5ꢃ2J125K
ꢃ1
ꢃ±
1
1
512 ±50 resistor (±51±)
2.2± ±10% ±ꢄ resistor (±51±)
IꢃC LꢃC-LꢃF ±51±-21-ꢃ2±2-F
2.1µF ±120%1ꢀ3 ꢂ7ꢃ
ceramic capacitors (2ꢀ2ꢁ)
Taiyo Yuden EMK127BJ124KA
ꢃꢁ
ꢃ4% ꢃ5% ꢃꢀ
ꢃ7
1
ꢁ
1
1
1
1
5
1
1
1
51 ±50 resistor (2825)
1k ±50 resistors (2825)
12 ±50 resistor (2825)
5-pin terminal block
Cꢀ% C7% C8
C9
±.±µF ±120% ±53 ꢂ7ꢃ
ceramic capacitor (1±2ꢀ)
TDK Cꢁ±1ꢀꢂ7ꢃ1E±±5K
TB1
U1
MAꢂ1894ꢂEEE% 1ꢀ-pin QSOP
MAꢂ1ꢀ15EUK-T% 5-pin SOT±ꢁ
Shunts (JU1–JU5)
U±
2.1µF ±120% 523 ꢂ7ꢃ
ceramic capacitors (2825)
Taiyo Yuden UMK±1±BJ124KG%
not installed
None
None
None
None
C12% C11% C1ꢁ%
C14
2
1
MAꢂ1894 PC board
MAꢂ1894 data sheet
MAꢂ1894 E3 kit data sheet
122mA% ꢁ23% Schottky diode%
SOT±ꢁ
D1
Central Semiconductor CMPSH-ꢁ
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX1894/MAX1924 Evaluation Kit
Component Suppliers
SUPPLIERS
Fairchild Semiconductor
International ꢃectifier
IꢃC
PHONE
FAX
WEBSITE
www.fairchildsemi.com
www.irf.com
888-5±±-5ꢁ7±
ꢁ12-ꢁ±±-ꢁꢁꢁ1
ꢁꢀ1-99±-7922
822-ꢁ48-±49ꢀ
847-82ꢁ-ꢀ122
428-988-8222
97±-912-82±ꢁ
ꢁ12-7±ꢀ-87±1
ꢁꢀ1-99±-ꢁꢁ77
847-9±5-2899
847-ꢁ92-4425
428-5ꢀ7-8979
www.irctt.com
Taiyo Yuden
www.t-yuden.com
www.component.tdk.com
www.vishay.com
TDK
3ishay Siliconix
Note: Please indicate that you are using the MAX1894 or MAX1924 when contacting these component suppliers.
Quick Start
The MAꢂ1894 E3 kit is fully assembled and tested.
Follow these steps to verify board operation. Do not turn
on the power supply until all connections are completed.
+
CELL 4
CELL 3
CELL 2
CELL1
-
TB1
MAX1894
B4P
Recommended Equipment
+
-
PACK+
• Current-limited ±53 power supply (or Li+ charger)
• One voltmeter
B3P
B2P
B1P
BN
+
-
POWER
SUPPLY
+
-
• Four Li+ cells (±.ꢁ3 to 4.ꢁ53)
PACK -
Warning: Exercise caution when handling loose Li+ cells.
Obey all manufacturer guidelines for handling Li+ cells.
For test purposes% floating power supplies can be substi-
tuted for the Li+ cells.
+
-
Jumper Setting and
Connecting the Li+ Cells
1) Install a shunt across pins 1 and ± of jumper JU1.
Figure 1. Connecting the Li+ Cell, Power Supply, and Voltmeter
±) Install a shunt across pins ± and ꢁ of jumpers JU±
and JUꢁ.
ꢁ) Install a shunt across jumper JU4% and remove the
shunt from jumper JU5.
4) See Figure 1 for connecting the Li+ cells (steps 5 to 1±).
5) Connect the negative terminal of Li+ cell 1 to BN of
terminal block TB1.
1±) Connect the positive terminal of Li+ cell 4 to B4P of
terminal block TB1.
Connecting the Power Supply
1) See Figure 1 for connecting the power supply (steps
± and 4 below). The power supply should be current
limited to no more than the C rate of the battery pack.
±) Using short banana leads% connect the negative ter-
minal of the power supply to J± (PACK-).
ꢀ) Connect the positive terminal of Li+ cell 1 to B1P of
terminal block TB1.
ꢁ) Turn on the power supply and set the power-supply
voltage to 4.±3 x the number of cells in series.
Momentarily connect the positive terminal of the
power supply to J1 (JACK+).
4) ꢃemove the positive terminal of the power supply
from PACK+% and verify that the DSO% CGO% and
TKO pads are pulled low.
5) Momentarily short the PACK+ and PACK- pads with
a short banana lead. 3erify that the DSO% CGO% and
TKO pads are pulled high.
ꢀ) ꢃeconnect the positive terminal of the power supply
to J1 (PACK+).
7) Connect the negative terminal of Li+ cell ± to B1P of
terminal block TB1.
8) Connect the positive terminal of Li+ cell ± to B±P of
terminal block TB1.
9) Connect the negative terminal of Li+ cell ꢁ to B±P of
terminal block TB1.
12) Connect the positive terminal of Li+ cell ꢁ to BꢁP of
terminal block TB1.
11) Connect the negative terminal of Li+ cell 4 to BꢁP of
terminal block TB1.
2
_______________________________________________________________________________________
MAX1894/MAX1924 Evaluation Kit
Shutdown
The MAꢂ1894 E3 kit goes into shutdown mode when
an undervoltage fault occurs or when a logic high is
applied to the shutdown pad (SHDN). During shutdown
mode% the quiescent current is 2.8µA (typ).
7) 3erify that the DSO% CGO% and TKO pads are pulled
low.
Note: Short leads are less than ꢀin long.
Detailed Description
The MAꢂ1894 E3 kit protects Li+ battery cells against
charge/discharge faults. The E3 kit is designed for both
ꢁ- and 4-cell applications. It is configured from the fac-
tory for a 4-cell application with the MAꢂ1894ꢂ
installed. For a ꢁ-cell application% replace the
MAꢂ1894ꢂ with the MAꢂ19±43 and reconfigure jumper
JU5 (see Table 5). The E3 kit monitors the voltage
across each cell to provide protection against under-
voltage and overvoltage conditions. The E3 kit also moni-
tors the voltage across the current-sense resistor (ꢃ±) to
protect against excessive charge and discharge current%
and pack short conditions.
Control
The control pad (CTL) on the MAꢂ1894 E3 kit can be
connected to one of the GPIO lines of a µC to turn off
all the protection MOSFETs simultaneously.
Discharge Current Protection
ꢄhen the discharge current exceeds 7.±5A (I
OD_TH
=
OD_TH
3
/ꢃ±) for more than ꢁms% all protection MOSFETs
are turned off% disconnecting the battery pack from the
current path.
Charge-Current Protection
ꢄhen the charge current exceeds 5A (I
OC_TH
=
OC_TH
The MAꢂ1894 E3 kit also features a MAꢂ1ꢀ15 low-
power linear regulator% configurable for ꢁ.ꢁ3 or 53 to
power a µC. The linear regulator can provide ꢁ2mA for
3IN up to ±83. The charge and discharge paths of the
battery pack are controlled by three P-channel
MOSFETs: the trickle-charge MOSFET P1% the overdis-
charge MOSFET P±% and the overcharge MOSFET Pꢁ.
In the event of a fault condition% some or all of these
protection MOSFETs are turned off to disconnect the
battery pack from the current path. The MAꢂ1894 E3 kit
provides two logic-level inputs% which can be connect-
ed to general-purpose input/output (GPIO) lines from a
µC. These inputs can be used to turn off all three pro-
tection MOSFETs% or put the MAꢂ1894 in shutdown
mode for minimizing the current consumption during
pack storage.
3
/ꢃ±) for more than ꢁms% the trickle-charge
MOSFET P1 and the overcharge MOSFET Pꢁ are
turned off% disconnecting the battery pack from the
current path.
Pack-Short Current Protection
ꢄhen the discharge current exceeds a second higher
current limit% ±2A (I
= 3
/ꢃ±) for more than
PS_TH
PS_TH
452µs% all protection MOSFETs are turned off% discon-
necting the battery pack from the current path.
Jumper Selection
VDD Enable
Jumper JU4 enables the 3DD power supply by con-
necting the input of the MAꢂ1ꢀ15 to B4_P. Install a
shunt on JU4 to enable 3DD. ꢃemove the shunt from
JU4 to disable 3DD. See Table 4 for shunt positions.
Trickle-Charge Operation
ꢄhen the MAꢂ1894 is in an undervoltage or deep dis-
VDD Selection
Jumper JU1 selects the output voltage of 3DD. To set
charge state (3
< 4.53 typ)% the circuit operates in
CC
trickle-charge mode. During trickle-charge operation%
MOSFETs P± and Pꢁ are turned off and MOSFET P1 is
turned on to provide a lower current charge path for the
battery pack. ꢃefer to the Fast and Trickle-Charge
Paths section in the MAꢂ1894 data sheet.
3DD to +53% install a shunt across pins 1 and ± of JU1.
To set 3DD to +ꢁ.ꢁ3% install a shunt across pins ± and ꢁ
of JU1. See Table 1 for shunt positions.
MAX1894 EV Kit Shutdown
Jumper JU± selects the shutdown mode. To shut down
Normal Operation
ꢄhen all cell voltages are greater than ±.ꢁꢀ3% the
MAꢂ1894 E3 kit operates in normal mode and can
readily charge and discharge. During normal operation%
all three MOSFETs (P1% P±% and Pꢁ) are turned on to
provide a current path for the battery pack. The voltage
across the current-sense resistor (ꢃ±) monitors the
charge and discharge current during normal operation.
the part% install a shunt across pins 1 and ± of JU±. To
enable the part% install a shunt across pins ± and ꢁ of
JU±. The shutdown mode can also be driven by an
external µC connected to the SHDN pad. To use an
external µC for the shutdown mode% remove the shunt
from JU± and connect the output of the µC to the SHDN
pad. See Table ± for shunt positions.
_______________________________________________________________________________________
3
MAX1894/MAX1924 Evaluation Kit
3-Cell/4-Cell Selection
Table 1. JU1 Jumper Selection
Jumper JU5 selects between the ꢁ-cell and the 4-cell
battery pack applications for the MAꢂ1894 E3 kit. The
MAꢂ1894 E3 kit is set at the factory for 4-cell applica-
tions. For ꢁ-cell battery pack applications% install a
shunt across JU5% and replace U1 with the MAꢂ19±43.
See Table 5 for shunt positions.
SHUNT
POSITION
JUMPER
VDD OUTPUT VOLTAGE (V)
1-±*
±-ꢁ*
3DD = +5
JU1
3DD = +ꢁ.ꢁ
*A shunt must be installed on one of these selections.
Table 2. JU2 Jumper Selection
SHUNT
POSITION
Table 4. JU4 Jumper Selection
JUMPER
EV KIT FUNCTION
SHUNT
VDD FUNCTION
JUMPER
1-±
Shutdown mode enabled
Shutdown mode disabled
POSITION
Installed
None
±-ꢁ
MAꢂ1ꢀ15 enabled
MAꢂ1ꢀ15 disabled
JU±
JU4
Shutdown mode controlled by an
external controller
None
Table 5. JU5 Jumper Selection
Table 3. JU3 Jumper Selection
SHUNT
EV KIT FUNCTION
SHUNT
POSITION
JUMPER
JUMPER
EV KIT FUNCTION
POSITION
Installed
None
ꢁ series cells
4 series cells
1-±
Control mode enabled (FETs OFF)
Control mode disabled
JU5
±-ꢁ
JUꢁ
Control mode controlled by an
external controller
None
Control
Jumper JUꢁ selects the logic state of the control pin of
the MAꢂ1894. To force a logic high on the control pin%
install a shunt across pins 1 and ± of JUꢁ. To force a
logic low on the control pin% install a shunt across pins
± and ꢁ of JUꢁ. The control mode can also be driven by
an external µC. ꢃemove the shunt from jumper JUꢁ and
connect the output of the µC to the CTL pad. See Table
ꢁ for shunt positions.
4
_______________________________________________________________________________________
MAX1894/MAX1924 Evaluation Kit
C12
0.1 F
D1
1
3
B4_P
13
BN
VDD
2
TKO
V
JU3
2
CC
1
CTL
11
TKO
DSO
CTL
PACK+
PACK+
J1
3
7
8
6
5
VDD
JU2
DSO
BANANA
C10
OPEN
P2
1
15
4
1
SHDN
PACK-
12
2
C9
SHDN
U1
MAX1894
2.2 F
3
2
3
BN
C13
OPEN
R7
10
16
14
C2
SRC
CGO
0.1 F
P1
1
2
3
C14
2
3
C3
OPEN
1
1
OPEN
P3
JU4
IN
4
5
4
C11
OPEN
C4
SHDN
R1
510
CGO
OPEN
2
3
GND
OUT
U2
4
8
B4_P
IC3
IC2
IC1
PKN
5
PACK+
7
6
R3
51
MAX1615
VDD
1
3
5
7
5/3
(FB)
6
8
VDD
B4P
B3P
B2P
B1P
TB1-1
TB1-2
B4_P
B3_P
C5
R4
1k
JU5
C1
1 F
4.7 F
PACK-
PACK-
C6
10
R5
1k
1
0.1 F
2
TB1-3
TB1-4
TB1-5
B2_P
B1_P
BN
JU1
R2
0.02
3
J2
BANANA
C7
R6
1k
0.1 F
9
BN
C8
0.1 F
BN
Figure 2. MAX1894 EV Kit Schematic
_______________________________________________________________________________________
5
MAX1894/MAX1924 Evaluation Kit
Figure 3. MAX1894 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX1894 EV Kit PC Board Layout—Component Side
Figure 5. MAX1894 EV Kit PC Board Layout—Solder Side
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© ±22± Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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