MAX1549EVKIT Maxim Integrated, MAX1549EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1549EVKIT
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX1549r

1) Ensure that the circuit is connected correctly to the
2) Verify that the shunts are installed across pins 1
3) Turn on battery power prior to +5V bias power; oth-
4) Verify that the output voltages are V
Table 1. Jumper JU1 Functions
(Output Voltage OUT1 Control)
Table 2. Jumper JU2 Functions
(Output Voltage OUT2 Control)
(Default)
installed
(Default)
Installed
1 and 2
2 and 3
1 and 2
2 and 3
JU1
supplies and dummy loads prior to applying any
power.
and 2 of jumper JU1 (ON1 high), pins 1 and 2 of
jumper JU2 (ON2 high), and pins 1 and 2 of JU6
(SKIP high, forced PWM).
erwise, the output UVLO timer times out and the
FAULT latch is set, disabling the regulator outputs
until +5V power is cycled or ON1/ON2 is toggled.
V
JU2
Not
Not
OUT2
= 2.5V.
Connected to VCC.
Connected to GND.
ON 1 m ust b e d r iven b y
an exter nal si gnal
connected to ON1 p ad.
Connected to VCC.
Connected to GND.
ON 2 m ust b e d r iven b y
an exter nal si gnal
connected to ON2 p ad.
ON1 PIN
ON2 PIN
_______________________________________________________________________________________
Detailed Description
OUT1 enabled, V
1.5V. OUT1 depends on
gate inputs G0 and G1.
See Table 4.
OUT1 shutdown mode
OUT1 operation depends
on the external ON1 signal
levels.
OUT2 enabled, V
2.5V
OUT2 shutdown mode
OUT2 operation depends
on the external ON2 signal
levels.
Jumper Settings
OUT1
OUT2
OUT1
Procedure
OUT1
OUT2
= 1.5V,
=
=
MAX1549 Evaluation Kit
Table 3. Jumpers JU3 Functions
(Switching-Frequency Selection)
Note: Do not change the operating frequency without first
recalculating component values. The frequency has a signifi-
cant effect on preferred inductor value, peak current-limit level,
MOSFET heating, PFM/PWM switchover point, output noise,
efficiency, and other critical parameters
Table 4. Jumpers JU4 and JU5 Functions
(Gate Inputs G0 and G1)
Table 5. Jumper JU6 Functions
(Low-Noise Mode)
(Default)
installed
1 and 2
1 and 3
1 and 4
JU3
(Default)
Not
Not installed
Not installed
1 and 2
2 and 3
G0 = GND
G0 = GND
G0 = VCC
G0 = VCC
Installed
Installed
JU6
JU4
Connected to GND
Connected to VCC
Connected to REF
Connected to VCC.
Connected to GND.
TON PIN
Floating
SKIP PIN
Not installed
Not installed
G1 = GND
G1 = GND
G1 = VCC
G1 = VCC
Installed
Installed
JU5
FREQUENCY (kHz)
.
Low-noise mode,
OUT1 and OUT2 are in
forced PWM mode.
OUT1 and OUT2 are in
pulse-skipping mode.
(As Shipped)
OPERATIONAL
(Default)
400
200
100
300
MODE
OUT1
1.50V
0.70V
1.00V
1.30V
3