XRP6658EVB【PDF 1/7 页】EVAL BOARD FOR XRP6658

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X R P 6 6 5 8 E V B

1 A 1 . 5 M H z S y n c h r o n o u s S t e p - D o w n C o n v e r t e r

February 2012

GENERAL DESCRIPTION

The XRP6658 is a synchronous current mode

PWM step down (buck) converter capable of

delivering up to 1Amp of current and

optimized for portable battery-operated

applications.

Based on a current-mode 1.5MHz constant

frequency PWM control scheme, the XRP6658

reduces the overall component count and

solution footprint. It provides low output

voltage ripple and excellent line and load

regulation. It also implements a PFM mode to

improve light load efficiency as well as a 100%

duty cycle LDO mode. Output voltage is

adjustable to as low as 0.6V with a better than

3% accuracy while a low quiescent current

supports the most stringent battery operating

conditions.

Built-in over temperature and under voltage

lock-out protections insure safe operations

under abnormal operating conditions.

The XRP6658 is offered in a RoHS compliant,

“green”/halogen free 5 -pin SOT23 package.

Rev. 2.1.0

E V A L U A T I O N B O A R D M A N U A L

FEATURES

? Guaranteed 1A Output Current

? Input Voltage: 2.5V to 5.5V

? 1.5MHz PWM Current Mode Control

? PFM Mode Operations at Light Load

? 100% Duty Cycle LDO Mode Operations

? Achieves 97% Efficiency

? Adjustable Output Voltage Range

? As Low as 0.6V with ±3% Accuracy

? Internal Compensation Network

? Over Temperature & UVLO Protection

EVALUATION BOARD SCHEMATICS

Fig. 1: XRP6658EVB Evaluation Board Schematics

Exar Corporation

48720 Kato Road, Fremont CA 94538, USA

www.exar.com

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

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