©
Enpirion 2008 all rights reserved, E&OE
1
www.enpirion.com
EN5322QI
2 A Voltage Mode Synchronous Buck PWM
DC-DC Converter Evaluation Board
DESCRIPTION
The EN5322 evaluation board is configured to
provide a 1.2 V output at up to 2 A from a 2.4 V
to 5.5 V input. The output can be set to 7
different voltages through the three VID output
voltage select pins.
If using the external divider option, V
OUT
can be
adjusted from 0.6 V up to V
IN
– V
DROPOUT
,
where V
DROPOUT
= I
LOAD
*
R
DROPOUT
.
The 4 MHz operation allows for the use of tiny
MLCC capacitors. It also enables a very wide
control loop bandwidth providing excellent
transient performance and reduced output
impedance. The internal compensation is
designed for unconditional stability for all
operating conditions. The Power OK signal is
available.
FEATURES
•
Input Voltage Range: 2.4 V – 5.5 V
•
7 Output Voltage Options via VID Pins
•
Adjustable
Output Voltage via External
Resistor Divider
•
2 A Load Current Guaranteed
•
Fully Assembled and Tested
Applications
•
Point of Load Regulation for Low Power
Processors, Network Processors, DSPs’
FPGAs and ASICs
•
Replacement of LDOs
•
Noise Sensitive Applications such as A/V
and RF
•
Computing,
Computer
Peripherals, Storage,
Networking, and Instrumentation
•
DSL, STB, DVR, DTV, and iPC
EVALUATION BOARD BILL OF MATERIALS
Ref Des
Qty
Description
Manufacturer P/N
C2
1
Ceramic Capacitor, 10 uF, 10 V, X7R, 0805
Murata: GRM21BR71A106KE51L
C3
1
Ceramic Capacitor, 47 uF, 6.3 V, X5R, 1206
Murata: GRM31CR60J476ME19L
C11
1
Ceramic Capacitor, 1 uF, 6.3 V, X7R, 0603
Panasonic: ECJ1VB0J105K
U1
1
2 A PWM Converter
Enpirion: EN5322QI-T
R4
1
1
Resistor, 100 kOHM, 5%, 1/8 W, 0805
Digikey: 311-100KACT-ND
C8
2
1 Electrolytic
Capacitor,
150
uF, 10 V
Panasonic: EEVFK1A151P
C10
2
1
Ceramic Capacitor, 10 uF, 10 V, X7R, 0805
Murata: GRM21BR71A106KE51L
D1
2
1
TVS Unidirect, 600 W, 6.5 V
Littlefuse: SMBJ6.5A
FB1
2
1
Multilayer Ferrite Bead, 4000MA, 0805
Wurth: 742792012
J1
2
1
Connector, Custom, Vertical Header
Samtec: ASP12192002
TP5-TP9
2
5
Connector, Test Point
Keystone: 5016
C1, C4, C5, C6, C9, C12
Not Used
R1, R2
Not Used
TP1-TP2
Not Used
Note 1: R4 is not required if POK is not used.
Note 2: These components are only for demonstration purposes, and are not needed for circuit design.
