MAX1706EVKIT [MAXIM]
Evaluation Kit for the MAX1705/MAX1706 ; 评估板MAX1705 / MAX1706\n
| 型号： | MAX1706EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1705/MAX1706
|
| 文件： | 总4页 (文件大小：53K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX1 7 0 5 Eva lu a t io n Kit
Evluates:5/MAX1706
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ +0.9V to +4.5V Input Range
The MAX1705 evaluation kit (EV kit) is a step-up switch-
ing regulator for battery-powered systems operating
from 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The EV kit
accepts a +0.9V to +4.5V input and converts it to a
4.5V step-up output and a 3.3V linear-regulator output.
It provides low quiescent current, high-efficiency pulse-
frequency-modulation operation for maximum battery
life, and a high-power, fixed-frequency pulse-width-
modulation mode. The MAX1705 features a built-in,
low-dropout linear post-regulator that reduces high-fre-
quency ripple.
♦ High-Power Output: 4.5V or Adjustable
♦ Dual Outputs: Step-Up and Linear Regulator
♦ 200mA Max Linear-Regulator Output Current
♦ Optional Track Mode for Highest Efficiency
♦ Low-Noise, 3.3V or Adjustable Output Voltage
♦ High-Efficiency Step-Up Converter: Up to 96%
♦ Up to 850mA Total Output Current
♦ Internal 300kHz Oscillator
The MAX1705 EV kit is a fully assembled and tested
surface-mount circuit board. It can also be used to
evaluate the MAX1706.
♦ Internal MOSFET and Synchronous Rectifier
♦ 1µA Shutdown Current
____________________Co m p o n e n t Lis t
♦ Power-Good Output
DESIGNATION QTY
DESCRIPTION
♦ Surface-Mount Components
22µF, 25V tantalum capacitor
Sprague 593D226X0025D2W or
AVX TPSD226M025R0200
C1
C8
1
1
♦ Fully Assembled and Tested
220µF, 10V low-ESR tantalum capacitor
Sprague 594D227X0010D2T,
Sprague 593D227X0010D2W, or
AVX TPSE227M010R0100
______________Ord e rin g In fo rm a t io n
C3
C4
1
1
0.1µF ceramic capacitor
22µF, 6.3V tantalum capacitor
Sprague 595D226X06R3B2T
PART
TEMP. RANGE
BOARD TYPE
MAX1705EVKIT
0°C to +70°C
Surface Mount
C5, C7, C9
3
1
0
0.33µF ceramic capacitors
22pF ceramic capacitor
Open
Note: To evaluate the MAX1706, request a MAX1706EEE free
sample with the MAX1705 EV kit.
C6
C2
Schottky diode
Motorola MBR0520L
D1
L1
1
1
10µH inductor
Sumida CDR74B-100
R1
R2, R4
R3
1
2
1
0
1
3
1
3
1
1
1
267kΩ, 1% resistor
100kΩ, 1% resistors
165kΩ, 1% resistor
Open
______________Co m p o n e n t S u p p lie rs
SUPPLIER
AVX
PHONE
FAX
(803) 946-0690
(847) 639-6400
(561) 241-7876
(402) 564-3131
(602) 303-5454
(603) 224-1961
(847) 956-0666
(203) 268-6261
(803) 626-3123
(847) 639-1469
(561) 241-9339
(402) 563-6418
(602) 994-6430
(603) 224-1430
(847) 956-0702
(203) 452-5670
R5
Coilcraft
R6
0Ω resistor
R7, R8, R9
U1
100kΩ, 5% resistors
MAX1705EEE (QSOP-16)
2-pin headers
Coiltronics
Dale-Vishay
Motorola
JU1, JU2, JU3
JU4
3-pin header
Sprague
None
Shunt
Sumida
None
MAX1705 PC board
Vishay/Vitramon
Note: Please indicate that you are using the MAX1705 when
contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX1 7 0 5 Eva lu a t io n Kit
_________________________Qu ic k S t a rt
Table 1. Jumper JU1 Functions
The MAX1705 evaluation kit (EV kit) is fully assembled
and tested. Follow these steps to verify board opera-
tion. Do not turn on the power supply until all con-
nections are completed.
SHUNT
LOCATION
ONA PIN
MAX1705 OUTPUT
Connected
to GND
Shutdown mode, VOUT = 0V,
POUT = V - V
On
IN
DIODE
1) Connect a +2.4V power supply to the VIN pad. The
ground connects to the GND pad.
Connected
to POUT
MAX1705 enabled,
VOUT = 3.3V, POUT = 4.5V
Off
2) Connect voltmeters, if any, to the POUT and VOUT
pads.
3) Turn on the power supply and verify that POUT is
4.5V and VOUT is 3.3V.
S w it c h in g Mo d e
The two-pin header JU2 selects either PFM or PWM
switching mode. Table 2 lists the selectable jumper
options.
4) Apply the loads, if any.
5) For other output voltages, refer to the Setting the
Output Voltages section in the MAX1705/MAX1706
data sheet for instructions on selecting the feed -
back resistors.
Table 2. Jumper JU2 Functions
SHUNT
LOCATION
CLK/SEL
PIN
SWITCHING MODE
_______________De t a ile d De s c rip t io n
Connected
to GND
PFM mode, I = 120mA
TOTAL
The MAX1705 EV kit is designed to supply both power
a nd low-nois e c irc uitry in p orta b le RF a nd d a ta -
acquisition instruments. It combines a linear regulator,
step-up switching regulator, N-channel power MOSFET,
P-channel synchronous rectifier, precision reference,
and low-battery comparator in a single, tiny 16-pin
QSOP. The switching DC-DC converter boosts an input
from one or two cells to a 4.5V output. An on-chip linear
regulator also provides a low-noise 3.3V output.
On
Off
at 2.4V input
Connected
to POUT
Fixed PWM mode (300kHz),
I
= 450mA at 2.4V input
TOTAL
Tra c k in g Mo d e
Connecting the TRACK input to POUT implements a
tracking mode that sets the step-up converter output to
300mV above the linear-regulator output, improving effi-
ciency. In tracking mode, feedback for the step-up con-
verter is derived from the OUT pin. Connect TRACK to
GND for normal operation.
Evluates:5/MAX1706
The EV kit operates in a constant-frequency (300kHz),
low-noise pulse-width-modulation (PWM) mode with
450mA total output current capability at V = 2.4V. A
IN
low-quiescent-current standby pulse-frequency-modu-
lation (PFM) mode offers a total output current up to
120mA and reduces quiescent power consumption to
500µW.
The two-pin header JU3 selects the tracking mode.
Table 3 lists the selectable jumper options.
Table 3. Jumper JU3 Functions
S h u t d o w n Mo d e
The MAX1705 EV kit features a shutdown mode that
reduces quiescent supply current to 7µA (1µA for the
IC plus 6µA for the feedback resistors) to preserve bat-
tery life. During shutdown, the reference, the low-bat-
tery comparator, and all feedback and control circuitry
are turned off. The step-up converter’s output drops to
within a Schottky diode drop below the input, and the
linear-regulator output is turned off.
SHUNT
LOCATION
TRACK PIN
TRACKING MODE
Connected
to POUT
Tracking mode; POUT is
300mV above VOUT
On
Connected
to GND
Off
Normal operation
P o w e r-Go o d Ou t p u t
The MAX1705 has an on-chip comparator for power-
good detection. This comparator can be used to detect
a low battery voltage at the input or low-voltage output.
The MAX1705 EV kit is supplied with the comparator’s
The two-pin header JU1 selects shutdown mode. Table 1
lists the selectable jumper options.
2
_______________________________________________________________________________________
MAX1 7 0 5 Eva lu a t io n Kit
Evluates:5/MAX1706
VIN
0.9V TO 4.5V
C1
22µF
L1
10µH
25V
14
15
13
12
POUT
4.5V
ONB
ONA
LX
R9
C8
C7
MBRO520L
100k
C2
220µF
10V
0.33µF
OPEN
ON/OFF
PGND
R1
R7
JU1
16
6
267k
1%
100k
POUT
OUT
11
4
R2
100k
1%
CLK/SEL
PWM/PFM
C3
0.1µF
U1
JU3
JU2
7
9
MAX1705
R8
100k
FB
VOUT
3.3V
LDO
TRACK
C4
C9
0.33µF
3
2
C6
22pF
R3
22µF
6.3V
REF
165k
C5
0.33µF
LBN
1%
8
1
10
5
FBLDO
LBP
PWRGD
LBO
R4
100k
1%
GND
3
1
JU4
2
R5
OPEN
R6
SHORT
VIN
Figure 1. MAX1705 EV Kit Schematic Diagram
LBN input connected to the reference, and the LBP
input connected to GND through R6 (0Ω). LBP can be
connected to an external resistor-divider, R5-R6, to set
the comparator threshold. PWRGD, an open-drain out-
put, is low when LBN > LBP. Refer to the Low-Battery
Comparator section of the MAX1705/MAX1706 data
sheet for instructions on selecting R5 and R6. The
three-pin header JU4 selects input or output detection.
Remove R6 and refer to the Low-Battery Comparator
section of the MAX1705/MAX1706 data sheet to deter-
mine R5 and R6. Table 4 lists the selectable jumper
options.
Eva lu a t in g t h e MAX1 7 0 6
The MAX1705 EV kit can also be used to evaluate the
MAX1706. Simply replace the MAX1705EEE with the
MAX1706EEE and replace the 10µH inductor, L1, with
a 22µH inductor (Sumida CD74B-220).
Table 4. Jumper JU4 Functions
SHUNT LOCATION
1 and 2
PWRGD OUTPUT
Detects low-battery voltage input
Detects low-voltage output
2 and 3
_______________________________________________________________________________________
3
MAX1 7 0 5 Eva lu a t io n Kit
1.0"
1.0"
Figure 2. MAX1705 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1705 EV Kit PC Board Layout—Component Side
Evluates:5/MAX1706
1.0"
Figure 4. MAX1705 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.
4
___________________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
© 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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