MAX669EVKIT [MAXIM]
Evaluation Kit for the MAX668/MAX669 ; 评估板MAX668 / MAX669\n
| 型号： | MAX669EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX668/MAX669
|
| 文件： | 总6页 (文件大小：84K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4778; Rev 0a; 8/98
MAX6 6 8 Eva lu a t io n Kit
Evluates:8/MAX69
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX668 evaluation kit (EV kit) combines a con-
stant-frequency, pulse-width-modulation (PWM) step-
up controller with an external N-channel MOSFET and
Schottky diode to provide a regulated output voltage.
♦ +3V to V
Input Range (as shipped)
OUT
♦ +12V or Adjustable Output Voltage
♦ Output Current Up to 1A
The EV kit accepts a +3V to V
input and converts it
OUT
♦ N-Channel External MOSFET
♦ 4µA IC Shutdown Current
to a +12V output for currents up to 1A, with greater than
90% c onve rs ion e ffic ie nc y. The EV kit op e ra te s a t
500kHz, allowing the use of small external components.
♦ 500kHz Switching Frequency
♦ Surface-Mount Components
♦ Fully Assembled and Tested
The MAX668 EV kit is a fully assembled and tested sur-
face-mount circuit board. This EV kit can also be con-
figured for the application circuits listed in the EV Kit
Application Circuit Capabilities table. For input voltages
below 3V and down to 1.8V, replace the MAX668 with a
MAX669. The MAX669 must always operate in boot-
strapped mode (JU2 shunt across pins 1 and 2).
Co m p o n e n t Lis t
DESIGNATION QTY
DESCRIPTION
68µF, 20V, low-ESR tantalum cap
Sprague 593D686X0020E2W or
AVX TPSE686M020R0150
C1
1
Ord e rin g In fo rm a t io n
120µF, 20V, low-ESR tantalum cap
Sprague 594D127X0020R2T
C5
1
PART
TEMP. RANGE
IC PACKAGE
C2
C3
1
1
2
1
0
0.1µF ceramic capacitor
0.22µF ceramic capacitor
1µF ceramic capacitors
220pF ceramic capacitor
Not installed
MAX668EVKIT
0°C to +70°C
10 µMAX
Note: To evaluate the MAX669, request a MAX669EUB free
sample with the MAX668EVKIT.
C4, C8
C7
C6
3A Schottky diode
Hitachi HRF302A or
Motorola MBRS340T3
EV Kit Ap p lic a t io n Circ u it
Ca p a b ilit ie s
D1
L1
1
4.7µH power inductor
V
V
(V)
I
IN(MIN)
(V)
OUT
OUT
(A)
Sumida CDRH104-4R7 (shielded),
Coiltronics UP2B-4R7, or
Coilcraft DO3316P-472
1
1.8
1.8
2.5
3
12
24
12
5
0.4
0.1
N-channel MOSFET
Fairchild FDS6680 or
International Rectifier IRF7801
N1
R1
1
1
0.65
3
0.020Ω, 1%, 1/2W resistor
Dale WSL-2010-R020F or
IRC LR2010-01-R020F
3
12
36
24
1
3
0.02
0.5
12
R2
R3
1
1
1
1
2
1
2
1
1
218kΩ, 1% resistor
24.9kΩ, 1% resistor
100kΩ, 1% resistor
MAX668EUB
Note: Design information for these applications is included.
The shaded row shows EV kit configuration as shipped.
R4
U1
JU1, JU2
JU3
3-pin headers
2-pin header
None
None
None
Shunts (JU1, JU2)
MAX668/MAX669 PC board
MAX668/MAX669 data sheet
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX6 6 8 Eva lu a t io n Kit
If the minimum input voltage is below +3.0V, use the
Co m p o n e n t S u p p lie rs
MAX669 with V bootstrapped from V
(Table 1). In
CC
OUT
SUPPLIER
AVX
PHONE
FAX
bootstrapped mode, if V
the n LDO ma y b e s horte d to V
dropout voltage of the LDO regulator. This increases the
gate drive to the MOSFET, which lowers the MOSFET
on-resistance but increases the MAX668 supply current
due to gate-charge loss.
is always less than +5.5V,
OUT
to e limina te the
CC
803-946-0690
708-639-6400
561-241-7876
402-564-3131
408-721-2181
888-777-0384
803-626-3123
708-639-1469
561-241-9339
402-563-6418
408-721-1635
650-244-7947
CoilCraft
Coiltronics
Dale-Vishay
Fairchild
If V is greater than +3.0V, the MAX668’s V
can be
IN
CC
Hitachi
powered from V . This will decrease quiescent power
IN
dissipation, especially when V
always less than +5.5V, LDO may be shorted to V to
is large. If V is
OUT
IN
International
Rectifier
310-322-3331
310-322-3332
CC
eliminate the dropout voltage of the LDO regulator. If
IRC
512-992-7900
602-303-5454
408-988-8000
603-224-1961
708-956-0666
203-268-6261
512-992-3377
602-994-6430
408-970-3950
603-224-1430
708-956-0702
203-452-5670
V
IN
is in the range of +3V to +4.5V, then the user may
Motorola
Siliconix
Sprague
Sumida
still want to bootstrap from V
to increase gate drive
OUT
to the MOSFET at the expense of power dissipation. If
is always greater than +4.5V, the V input should
V
IN
CC
always be tied to V , since bootstrapping from V
IN
OUT
will not increase the gate drive from LDO, but quiescent
power dissipation will rise. Jumpers JU2 and JU3 con-
Vishay/Vitramon
Note: Please indicate that you are using the MAX668 when con-
tacting these component suppliers.
trol the V
data sheet).
and LDO inputs (see MAX668/MAX669
CC
J u m p e r S e le c t io n
The 3-pin header JU1 selects shutdown mode. Table 1
lists the selectable jumper options. The 3-pin header
J U2 s e le c ts b oots tra p p e d mod e . Ta b le 2 lis ts the
_________________________Qu ic k S t a rt
The MAX668 EV 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.
selectable jumper options. For V less than 5.5V, use
CC
Evluates:8/MAX69
the 2-pin header JU3 to short LDO to V . This elimi-
CC
1) Place the shunt on JU1 across pins 1 and 2. Verify
nates the internal linear regulator (LDO) dropout volt-
age. For the MAX668, this allows operation with input
voltages down to 2.7V. Table 3 lists the selectable
jumper options.
that the shunt is across JU2 pins 2 and 3 (V
is
CC
tied to V ) and JU3 is open (LDO is open).
IN
2) Connect a +5V supply to the V pad. Connect
IN
ground to the GND pad.
Ot h e r Ou t p u t Vo lt a g e s
The MAX668 EV kit can also be used to evaluate other
output voltages. Refer to the Output Voltage Selection
section in the MAX668 data sheet for instructions on
selecting the feedback resistors R2 and R3. For output
voltages greater than 15V, replace C5 (20V) with a
capacitor that has a higher voltage rating.
3) Connect a voltmeter to the V
pad.
OUT
4) Turn on the power supply and verify that the output
voltage is 12V.
_______________De t a ile d De s c rip t io n
The MAX668 EV kit provides a regulated +12V output
voltage from an input source as low as +3V. It drives
loads up to 1A with greater than 90% conversion effi-
ciency. This EV kit is shipped configured in the non-
In addition to the standard EV kit configuration of 3V
IN
to 12V
a t 1A, the EV Kit Ap p lic a tion Circ uit
OUT
Capabilities table listed several common Input/Output
combinations. Table 4 lists the components recom-
mended for these alternative circuits.
bootstrapped mode (V is tied to V ). However, there
CC
IN
a re s e ve ra l me thod s of c onne c ting V
a nd LDO
CC
depending on the specific design including input and
output voltage range, quiescent power dissipation,
MOSFET selection, and load.
2
_______________________________________________________________________________________
MAX6 6 8 Eva lu a t io n Kit
Evluates:8/MAX69
Table 1. Jumper JU1 Functions
SHUNT
LOCATION
MAX668 OUTPUT
SYNC/SHDN PIN
MAX668 enabled, V
MAX668 operates at internal frequency.
= 12V.
OUT
1 and 2
2 and 3
Connected to V
CC
Connected to GND
Floating
Shutdown mode, V = V - diode
OUT
IN
MAX668 can be externally synchronized when the
SYNC/SHDN pad is clocked.
Not installed
Table 2. Jumper JU2 Functions
SHUNT
LOCATION
V
CC
PIN
MAX668 MODE
1 and 2
2 and 3
Connected to V
Bootstrapped mode
OUT
Connected to V
Non-bootstrapped mode
IN
Table 3. Jumper JU3 Functions
SHUNT LOCATION
LDO PIN
On
Off
Connected to V
CC
Open
_______________________________________________________________________________________
3
MAX6 6 8 Eva lu a t io n Kit
Table 4. Components for Alternate Application Circuits
JU2
BOOT-
STRAPPED
vs.
NON-BOOT-
STRAPPED
MAXIM
PART
NO.
V
(MIN)
(V)
IN
V
(V)
I
L1
(µH)
R1
R2 R3 R4
OUT OUT
D1
N1
C1
C5
C6
(A)
(mΩ) (kΩ) (kΩ) (kΩ)
20
Dale
68µF
20V
AVX
120µF
20V
Sprague
4.7
Sumida
Bootstrapped CDRH10
4-4R7
International
Rectifier
IRF7401
1 & 2
Hitachi
HRF302A
1.8
1.8
2.5
3
12
24
12
5
0.4 MAX669
0.1 MAX669
0.65 MAX669
WSL- 218 24.9 100
2010-
R020F
Open
TPSE686M 594D127X
020R0150 0020R2T
15
Dale
68µF
20V
AVX
22µF
35V
AVX
22µF
35V
AVX
1.0
Coilcraft
Bootstrapped D03316-
102
International
Rectifier
IRF7401
1 & 2
Hitachi
HRF302A
WSL- 454 24.9 200
2010-
R015F
TPSE686M TPSE226M TPSE226M
020R0150 035R0300 035R0300
20
Dale
68µF
20V
AVX
120µF
20V
Sprague
4.7
Sumida
Bootstrapped CDRH10
4-4R7
International
Rectifier
IRF7401
1 & 2
Hitachi
HRF302A
WSL- 218 24.9 100
2010-
R020F
Open
TPSE686M 594D127X
020R0150 0020R2T
15
Dale
330µF
10V
Kemet
330µF
10V
Kemet
330µF
10V
Kemet
4.7
Sumida
Bootstrapped CDRH12
7-4R7
1 & 2
Hitachi
HRF502A
Fairchild
FDS6680
3
MAX668
WSL- 75 24.9 100
2512-
R015F
T510X337 T510X337 T510X337
M010
M010
M010
Evluates:8/MAX69
10µF
6.3V, X7R
Taiyo
Yuden
JMK325BJ1
06MN
100
Dale
2.2µF
50V, X7R
Kemet
C1825C22
5MR0RAC
4.7
Central
Semi-
conductor FDS5610
CMPD914
2 & 3
Sumida
Non-
Fairchild
3
36
0.020 MAX668
WSL- 398 24.9 100
1206-
R100F
Open
CD43-
4R7
Bootstrapped
33µF
20V
AVX
50
Dale
22µF
35V
AVX
22
2 & 3
Sumida
Non-
Motorola
Fairchild
12
24
0.5 MAX668
WSL- 453 24.9 100
2010-
R050F
Open
CD73-
220
MBRS140T3 FDS6680 TPSD336M
020R0200
Bootstrapped
TPSE226M
035R0300
Note: This table lists components recommended for building other application circuits using the MAX668 EV kit.
4
_______________________________________________________________________________________
MAX6 6 8 Eva lu a t io n Kit
Evluates:8/MAX69
1U
AM6X8
Figure 1. MAX668 EV Kit Schematic
_______________________________________________________________________________________
5
MAX6 6 8 Eva lu a t io n Kit
1.0"
Figure 2. MAX668 EV Kit Component Placement Guide—
Component Side
Evluates:8/MAX69
1.0"
Figure 3. MAX668 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX668 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
_____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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