MAX1802 Evaluation Kit for

Digital Still Cameras

2

_______________________________________________________________________________________

Recommended Equipment

•

+3.3V to +11V battery or power supply

•

Digital voltmeter (DVM)

Quick Start

1) Make sure jumpers JU1–JU6 are connected in the

ON position. This ensures all converters will turn on

at power-up.

2) Before loading any output, check the output voltage

and output current capability shown in Table 1.

3) Make sure jumpers JU7–JU12 are connected if no

external loads are attached to the OUT1A, OUT1B,

OUT1C, OUT2A, OUT2B, and OUT2C outputs.

4) Attach a +3.3V to +7V battery or power supply to

IN.

5) Using the DVM, measure the voltage at MAIN,

CORE, OUT1_, OUT2_, OUT3, and OUT4.

Detailed Description

MAIN Output

The main output (MAIN) powers the core supply of the

MAX1802. MAIN must be regulated before any of the

other outputs function.

To enable MAIN, place jumper JU4 to the ON position.

Apply +3.3V to +11V between IN and GND. The voltage

between MAIN and GND should be approximately +3.3V.

If IN is less than +3.3V, MAIN will not be regulated.

CORE Output

The core output (CORE) is powered from MAIN and reg-

ulated at +1.8V using a synchronous-rectified step-down

converter. Drawing more than 200mA out of CORE

reduces the current capability at MAIN.

To enable CORE, place jumper JU5 to the ON position.

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

D7, D8

2

Schottky diodes (SOD123)

Motorola MBR0520L or

Fairchild Semiconductor MBR0520L

D9

1

Schottky diode (S-FLAT)

Toshiba CRS05 (not installed)

JU1–JU6

6

3-pin headers

JU7–JU12

6

2-pin headers

L1

1

4.7

µH inductor

Sumida CR43-4R7

L2, L4

2

10

µH inductors

Sumida CDRH6D28-100

L3

1

3.3

µH inductor

Sumida CR43-3R3

Q1, Q2, Q3, Q5

4

N-channel MOSFETs (SuperSOT-3)

Fairchild Semiconductor FDN337N

Q4

1

P-channel MOSFET (SO-8)

Vishay/Siliconix SI9803DY

Q6

1

N-channel MOSFET (SuperSOT-3)

Fairchild Semiconductor FDN359AN

R1

1

40.2k

Ω ±1% resistor (0603)

R2

1

866k

Ω ±1% resistor (0603)

R3, R19, R20,

R22, R24, R28

6

100k

Ω ±1% resistors (0603)

R4, R13, R14,

R15

4

10k

Ω ±5% resistors (0402)

R5, R6, R26,

R27, R30, R31

6

Open (0402), not installed

R7

1

Short (0603), not installed,

shorted in the PC board layout

R8–R12

5

Open (0603), not installed

R16

1

33k

Ω ±5% resistor (0603)

R17

1

91k

Ω ±5% resistor (0603)

R18

1

464k

Ω ±1% resistor (0603)

R21

1

44.2k

Ω ±1% resistor (0603)

R23

1

165k

Ω ±1% resistor (0603)

R25, R29

2

301k

Ω ±1% resistors (0603)

R32, R33, R37,

R38, R41, R42

6

3k

Ω ±5% resistors (1206)

R34, R35, R39, R40

4

200

Ω ±5% resistors (1206)

R36

1

750

Ω ±5% resistor (1206)

DESIGNATION

QTY

DESCRIPTION

T1

1

Sumida transformer

CLQ72-type package

Sample number: 6333-T334

T2

1

Sumida transformer

CLQ72-type package

Sample number: 6333-T333

U1

1

MAX1802EHJ (32-pin TQFP)

U2

1

MAX1801EKA (8-pin SOT23)

None

12

Shunts