19-1871; Rev 0; 12/00
MAX1747 Evaluation Kit
General Description
The MAX1747 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains
three charge-pump regulators. The first one is a high-
current step-up DC-DC converter and is configured for
a +5V output that provides up to 200mA of current. The
other two charge pumps are low-current charge pumps
that generate positive and negative voltages. A +3.0VDC
to +3.6VDC source can be utilized to power the EV kit
input.
The low-current negative charge-pump circuit is config-
ured for a -7V output; the low-current positive charge-
pump circuit is configured for a +12V output. Both cir-
cuits provide up to 20mA of current. The high-current
step-up DC-DC converter or the EV kit鈥檚 input source
can be used to power either or both charge pumps.
The MAX1747 EV kit demonstrates an inductorless and
low profile (1.1mm max) solution. Operation up to
1.23MHz allows the use of tiny surface-mount compo-
nents and provides fast transient response.
o
Three Charge-Pump Regulators
+5V Output at 200mA
+12V Output at 20mA
-7V Output at 20mA
o
High-Current Output Regulated to 鹵1%
o
Adjustable Outputs
o
Integrated Power MOSFETs
o
1碌A(chǔ) Shutdown Current
o
Switching Frequency Up to 1.23MHz
o
Fast Transient Response
o
Surface-Mount Components
o
Fully Assembled and Tested
Features
o
Low-Profile Solution, 1.1mm max Height
Evaluates: MAX1747
Ordering Information
PART
MAX1747EVKIT
TEMP.RANGE
0擄C to +70擄C
IC PACKAGE
20 TSSOP
Component List
DESIGNATION
C1, C2, C3,
C17
QTY
4
DESCRIPTION
4.7碌F, 6.3V X7R ceramic
capacitors (1210)
Taiyo Yuden LMK325BJ475MD
1碌F, 16V X5R ceramic
capacitors (1206)
Murata GRM42-6X5R105K016
0.47碌F, 25V X7R ceramic
capacitors (1206)
Murata GRM42-6X7R474K025
0.1碌F, 16V X7R ceramic
capacitors (0603)
Taiyo Yuden EMK107BJ104KA
1500pF, 50V X7R ceramic
capacitor (0603)
Taiyo Yuden UMK107BJ152KZ
0.22碌F, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ224KA
Not installed (1210)
DESIGNATION
D1鈥揇4
R1
R2, R4, R6
R3
R5
R7
R8
R10
U1
JU1
JU2, JU3
None
None
None
None
QTY
4
1
3
1
1
0
1
1
1
1
2
3
1
1
1
DESCRIPTION
200mA, 25V Schottky diodes
(SOT23)
Fairchild BAT54S
150k鈩?鹵1% resistor (0805)
49.9k鈩?鹵1% resistors (0805)
432k鈩?鹵1% resistor (0805)
280k鈩?鹵1% resistor (0805)
Not installed (0805)
107k鈩?鹵1% resistor (0805)
1M鈩?鹵5% resistor (0805)
MAX1747EUP (20 TSSOP)
2-pin header
3-pin headers
Shunts (JU1, JU2, JU3)
MAX1747 PC board
MAX1747 data sheet
MAX1747 EV kit data sheet
C5, C7, C20,
C21, C22
5
C6, C8, C14
3
C9, C11, C12,
C15, C16, C19
6
C10
1
C13
C4, C18
1
0
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
1
2
3
4
5
