Datasheet

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General Description

The MAX16955 evaluation kit (EV kit) is a fully assem-

bled and tested PCB that contains all the components

necessary to evaluate the performance of the MAX16955

synchronous PWM step-down controller. The device is

available in a 16-pin TSSOP package and features an

exposed pad for enhanced thermal dissipation.

The EV kit requires a 6V to 36V power supply for normal

operation. The EV kit output is configured to 5V and can

deliver up to 5A output current. The EV kit can be easily

reconfigured to operate the controller in continuous PWM

mode, SKIP mode, or external synchronization operation.

The controller switching frequency is set to 400kHz. The

EV kit includes a jumper to enable the cir cuit and an LED

to monitor the power-good output.

Features

S 6V to 36V Input Range

S 5V at Up to 5A Output

S 400kHz Switching Frequency

S Selectable Forced Fixed-Frequency PWM Mode,

SKIP Mode, or External Synchronization

S Power-Good LED Indicator

S Enable Input

S Cycle-by-Cycle Current Limit and Thermal

Protection

S Proven PCB Layout

S Fully Assembled and Tested

DESIGNATION QTY DESCRIPTION

BIAS, EN, FSYNC,

OUT (x2),

SUP (x2)

7 Red multipurpose test points

C1 1

0.22FF Q10%, 50V X7R

ceramic capacitor (0805)

Murata GRM21BR71H224K

C2 1

47FF Q20%, 50V electrolytic

capacitor (D8)

Panasonic EEE-FK1H470XP

C4 1

0.1FF Q10%, 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H104K

C5, C9 0

Not installed, ceramic

capacitors (0603)

C6 1

100FF Q20%, 6.3V X5R

ceramic capacitor (1210)

TDK C3325X5R0J107M

C7 1

47FF Q20%, 6.3V X7R ceramic

capacitor (1210)

Murata GRM32ER70J476M

C8 1

1FF Q10%, 16V X7R ceramic

capacitor (0603)

Murata GRM188R71C105K

C10 1

6800pF Q10%, 50V X7R

ceramic capacitor (0603)

Murata GRM188R71H682K

DESIGNATION QTY DESCRIPTION

C11 1

4.7FF Q10%, 50V X7R ceramic

capacitor (1206)

Murata GRM31CR71H475K

C13 1

4.7FF Q10%, 50V X7R ceramic

capacitor (1210)

Murata GRM32ER71H475K

D1 1

60V, 3A Schottky diode (SMB)

Diodes Inc. B360B-13-F

D2 1 Red LED (0603)

D3 0

Not installed, Schottky diode

(3 SOT23)

JU1 1 3-pin header

JU2 1 2-pin header

L1 1

5.5FH Q20%,10A inductor

Würth 744325550

N1 1

40V, 6A dual n-channel

MOSFET (8 SO)

Fairchild FDS8949

PGND (x5),

SGND

6 Black multipurpose test points

R2, R5, R6 0 Not installed, resistors (0603)

R4 1

0.015I Q1%, 1/2W resistor

(1206)

IRC LRF1206LF-01-R015-F

R7, R12 2

0I Q5% resistors (0603)

R8 1

66.5kI Q1% resistor (0603)

MAX16955 Evaluation Kit

Evaluates: MAX16955

_________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Component List

19-5772; Rev 1; 1/12

Ordering Information appears at end of data sheet.

Summary of content (8 pages)

PAGE 1
9-5772; Rev 1; 1/12 MAX16955 Evaluation Kit Evaluates: MAX16955 General Description Features The MAX16955 evaluation kit (EV kit) is a fully assembled and tested PCB that contains all the components necessary to evaluate the performance of the MAX16955 synchronous PWM step-down controller. The device is available in a 16-pin TSSOP package and features an exposed pad for enhanced thermal dissipation. S 6V to 36V Input Range The EV kit requires a 6V to 36V power supply for normal operation.
PAGE 2
MAX16955 Evaluation Kit Evaluates: MAX16955 Component List (continued) DESIGNATION QTY R9 1 13kI Q1% resistor (0603) DESCRIPTION R10 1 10kI Q5% resistor (0603) R11 1 51.1kI Q1% resistor (0603) U1 1 Synchronous buck converter (16 TSSOP-EP) Maxim MAX16955AUE/V+ DESIGNATION QTY — 2 Shunts DESCRIPTION — 1 PCB: MAX16955 EVALUATION KIT Component Suppliers SUPPLIER PHONE WEBSITE Diodes Incorporated 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.
PAGE 3
MAX16955 Evaluation Kit Evaluates: MAX16955 Table 1. Jumper Descriptions (JU1, JU2) JUMPER JU1 SHUNT POSITION 1-2 Connects FSYNC to VBIAS to enable continuous PWM mode. 2-3* Connects FSYNC to AGND to enable SKIP mode under light-load conditions. When FSYNC is unconnected, or when a clock source is present, continuous PWM mode is enabled. SYNC can be used to synchronize with other supplies when a clock source is present. Open JU2 DESCRIPTION Closed Connects EN to AGND (shutdown).
PAGE 4
MAX16955 Evaluation Kit Evaluates: MAX16955 Figure 1.
PAGE 5
MAX16955 Evaluation Kit Evaluates: MAX16955 1.0” 1.0” Figure 2. MAX16955 EV Kit Component Placement Guide— Component Side Figure 3. MAX16955 EV Kit PCB Layout—Component Side 1.0” Figure 4.
PAGE 6
MAX16955 Evaluation Kit Evaluates: MAX16955 1.0” Figure 5. MAX16955 EV Kit PCB Layout—PGND and SGND Layer 3 1.0” Figure 6. MAX16955 EV Kit PCB Layout—Solder Side 1.0” Figure 7.
PAGE 7
MAX16955 Evaluation Kit Evaluates: MAX16955 Ordering Information PART TYPE MAX16955EVKIT# EV Kit #Denotes RoHS compliant.
PAGE 8
MAX16955 Evaluation Kit Evaluates: MAX16955 Revision History REVISION NUMBER REVISION DATE 0 2/11 Initial release — 1/12 Changed VOUT max from 12V to 10V in the Configuring the Output Voltage (OUT) section to match the IC data sheet 3 1 DESCRIPTION PAGES CHANGED Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.