MAX797EVKIT-SO Maxim Integrated, MAX797EVKIT-SO Datasheet - Page 2

• Manufacturer Part Number: MAX797EVKIT-SO
• Description: Power Management IC Development Tools Evaluation Kit for the MAX797
• Manufacturer: Maxim Integrated
• Series: MAX796, MAX797, MAX799r

Specifications of MAX797EVKIT-SO

• Input Voltage: 4.5 V
• Output Voltage: 5 V
• Output Current: 10 A

MAX797 Evaluation Kit
See Table 2 in the MAX796/MAX797/MAX799 data sheet for
component supplier phone/fax numbers.
2 ________________________________________________________________________________________
____________________Component List
DESIGNATION
C1, C11
Q1, Q2
C3, C8
R2, R3
R4, R5
R6, R8
J1, J2
J3, J4
C21
C2
C4
C5
C6
D1
D2
U1
L1
R1
R7
QTY
2
1
2
1
1
1
0
1
1
2
0
1
2
1
0
0
2
1
1
22µF, 35V low-ESR capacitors
AVX TPSE226M035R0300
Sprague 595D226X0035R2T
Kemet T510 X 477(1) 006 AS
470µF, 0.030Ω low-ESR capacitor
0.1µF ceramic capacitors
4.7µF, 16V tantalum capacitors
Sprague 595D475X0016A2T
0.33µF ceramic capacitor
0.01µF ceramic capacitor
Open
100mA, 30V Schottky diode
Central Semiconductor CMPSH-3
Motorola MBR0530
1A, 40V Schottky diode
Motorola MBRS140T3
Nihon EC10QS04
International Rectifier 10BQ040
2-pin headers
Leave these sites open
10µH, 2A inductor
Sumida CDRH-125-100 (shielded)
Coiltronics UP2-100
Coilcraft DO3316-103
5A, 30V logic-level N-channel MOSFETs
Motorola MMSF5N03HD
International Rectifier IRF7201
Siliconix Si9410
0.025Ω sense resistor
Dale WSL-2010-R025-F
IRC LR2010-R025-F
Unused reference designators
Leave these sites open
1MΩ, 5% resistors
100kΩ, 5% resistor
Maxim MAX797CSE
DESCRIPTION
1) Connect a stiff (20W or better) bench power supply
2) Check that the jumpers are set correctly (J1 and J2
3) Turn up the input voltage to somewhere between
4) Verify that the main output is regulating at 3.3V.
5) Ensure that the voltmeter is sensing directly at the
To observe normal PWM switching action, place a 1A
load on the main output and observe the switching
node (device LX pin) with an oscilloscope while varying
the input voltage. Without a load, the switching wave-
forms are intermittent and difficult to trigger on, and it
may appear that the board is not working.
Jumper J4 comes installed for 300kHz operation.
Component values may need to be changed if 150kHz
operation is selected; see the Design Procedure sec-
tion in the MAX796/MAX797/MAX799 data sheet. The
oscillator can be synchronized to an external clock sig-
nal by driving the SYNC pad with a pulse train of 5V
amplitude.
Table 1. Pull-Up/Down Resistors
Table 2. Jumper Connections
_________________________Quick Start
RESISTOR
JUMPER
to the VIN and GND pads found at the edge of the
board.
installed, J3 set to position 2-3, J4 set to 1-2).
4.75V and 28V.
Normal full-load regulation is -2.5% while keeping
the output in tolerance. If the measured error is high-
er, there may be drops in the wiring or ground.
output and ground pads of the PC board.
R4, R5
J1
J2
J3
J4
R6
R7
R8
On/off control. Remove to force shutdown
mode.
Low-noise mode select. Remove to force
low-noise mode.
Output voltage select. Install in position 1-2
for 5V, 2-3 for 3.3V.
Frequency select. Install in position 1-2 for
300kHz, 2-3 for 150kHz.
Adjustable-mode resistor dividers, not
installed. V
1MΩ, low-noise-mode pull-up resistor, usu-
ally shorted out (SKIP to GND).
100kΩ SYNC pull-up resistor, usually short-
ed out (SYNC to REF).
1MΩ SHDN pull-down resistor, usually
shorted out (SHDN to V+).
OUT
FUNCTION
= 2.505V (1 + R4/R5).
FUNCTION