MAX1676EVKIT Maxim Integrated, MAX1676EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX1676EVKIT
• Description: Power Management IC Development Tools Evaluation Kit for the MAX1676
• Manufacturer: Maxim Integrated
• Series: MAX1674, MAX1675, MAX1676r

Specifications of MAX1676EVKIT

• Output Voltage: 3.3 V, 5 V
• Output Current: 420 mA, 285 mA

MAX1676 Evaluation Kit
The input source for the MAX1676 EV kit must be
greater than 1.1V for guaranteed start-up (0.7V for
operation once started), and less than the output volt-
age. A typical input voltage range would be the 2.0V to
3.3V range of a 2-cell NiCd battery. An input voltage
greater than the selected output voltage (but less than
6V) will not damage the circuit, but under these circum-
stances, the MAX1676’s output will equal the input volt-
age minus the 0.7V drop of the internal diode (0.3V if
D1, the Schottky diode, is in the circuit).
Once started, the MAX1676 operates from the regulat-
ed output voltage. This means that the input voltage
can fall below the 1.1V minimum guaranteed start-up
voltage. Typically, the regulated output will be main-
tained even if the input voltage drops to 0.7V.
When using a single-cell battery, diode D1 must be
installed to ensure low-voltage start-up. Use a Motorola
MBR0520 or equivalent Schottky diode.
Figure 1. MAX1676 EV Kit Schematic
2
_______________________________________________________________________________________
(SHORT)
OPEN
0
R3
R4
0.1 F
C4
200
R1
Detailed Description
7
2
5
REF
BATT
LBI
Single-Cell Operation
MAX1676
GND
U1
Input Source
8
CLSEL
SHDN
OUT
LBO
LX
FB
9
10
3
6
4
1
22 H
L1
R2
OPEN
JU3
D1
OPEN
Three 3-pin jumpers select the output voltage, current
limit, and shutdown mode. Table 1 lists the selectable
jumper options.
Table 1. Jumper Selection Options
JUMPER
1
2
3
JU2
JU1
JU2
JU3
1
2
3
C1
47 F
16V
R5
OPEN
R6
OPEN
POSITION
JUMPER
Open
Open
1–2
2–3
1–2
2–3
1–2
2–3
1
2
3
+VBATT
GND
C3
1 F
JU1
3.3V fixed output
5V fixed output
Adjustable output using resistor-divider
R1 and R2.
Inductor peak current limited to 1.0A.
Inductor peak current limited to 0.5A.
SHDN = High. MAX1676 enabled.
SHDN = Low. MAX1676 disabled.
Drive pad SHDN with an external signal.
C2
100 F, 10V
Jumper Selection
FUNCTION
VOUT
GND
LBO
SHDN