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Exar Corporation

XRP6658 Datasheet Preview

XRP6658 Datasheet

1A 1.5MHz PFM/PWM Synchronous Step-Down Converter

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XRP6658
1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
January 2014
GENERAL DESCRIPTION
The XRP6658 is a synchronous current mode
PWM step down (buck) converter capable of
delivering up to 1 Amp 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 as well as provides a 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. 1.6.0
APPLICATIONS
Portable Equipments
Battery Operated Equipments
Audio-Video Equipments
Networking & Telecom Equipments
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
15µA Quiescent Current
Over Temperature & UVLO Protections
RoHS Compliant “Green”/Halogen Free
5-Pin SOT23 Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP6658 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001




Exar Corporation

XRP6658 Datasheet Preview

XRP6658 Datasheet

1A 1.5MHz PFM/PWM Synchronous Step-Down Converter

No Preview Available !

XRP6658
1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
Input Voltage VIN ...................................... -0.3V to 6.0V
EN, VFB Voltages .......................................... -0.3V to VIN
SW Voltage.................................... -0.3V to (VIN + 0.3V)
Storage Temperature .............................. -65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 260°C
ESD Rating (HBM - Human Body Model) .................... 2kV
ESD Rating (MM - Machine Model) ...........................200V
Junction Temperature (Notes 1, 3) ....................... 150°C
OPERATING RATINGS
Input Voltage Range VIN...............................2.5V to 5.5V
Ambient Temperature Range TA ................ -40°C to 85°C
Junction Temperature Range TJ.................-40°C to 125°C
Thermal Resistance ......................................................
θJA (5 Pin SOT23) .......................................134.5°C/W
θJC (5 Pin SOT23) ........................................... 81°C/W
ELECTRICAL SPECIFICATIONS
Specifications are for an Ambient Temperature of TA = 25°C only; limits applying over the full Operating Temperature range
are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical
values represent the most likely parametric norm at TA = 25°C, and are provided for reference purposes only. Unless
otherwise indicated, VIN = 3.6V, TA= 25°C.
Parameter
Input Voltage Range
Feedback Current
Regulated Feedback Voltage
Output Voltage Accuracy
Output Voltage Accuracy
Reference Voltage Line Regulation
Reference Voltage Line Regulation
Output Voltage Line Regulation
Output Voltage Line Regulation
Peak Inductor Current
PWM Quiescent Current (Note 2)
PFM Quiescent Current
Shutdown
Oscillator Frequency
Short-Circuit Oscillator Frequency
RDS(ON) of PMOS
RDS(ON) of NMOS
Under Voltage Lock Out
SW Leakage
Enable Threshold
Shutdown Threshold
EN Leakage Current
Min.
2.5
0.588
-3
-3
1.5
1.2
0.4
Typ.
0.600
2.3
188
15
0.1
1.5
900
0.24
0.21
1.8
Max.
5.5
+100
0.612
+3
+3
0.4
0.4
0.4
0.4
1
1.8
+1
1.2
+1
Units
V
nA
V
%
%
%/V
%/V
%/V
%/V
A
µA
µA
µA
MHz
kHz
V
µA
V
V
µA
Conditions
IOUT=100mA, VIN = 2.5V to 3.0V
• IOUT=100mA, VIN = 3.0V to 5.5V
VIN = 2.5V to 3.0V
• VIN = 3.0V to 5.5V
VIN = 2.5V to 3.0V
• VIN = 3.0V to 5.5V
VFB = 0.5V or VOUT = 90%
VFB = 0.5V or VOUT = 90%
VFB = 0.65V or VOUT = 108%
VRUN = 0V, VIN = 4.2V
• VFB = 0.6V or VOUT = 100%
• VFB = 0V or VOUT = 0V
ISW = 100mA
ISW = –100mA
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
Note 1: TJ is a function of the ambient temperature TA and power dissipation PD: (TJ = TA + (PD * θJA))
Note 2: Dynamic quiescent current is higher due to the gate charge being delivered at the switching frequency.
Note 3: This IC is built-in over-temperature protection to avoid damage from overload conditions.
Note 4: θJA is measured in the natural convection at TA=25on a high effective thermal conductivity test board (2 layers,
2S0P) of JEDEC 51-5 thermal measurement standard.
Note 5: θJC represents the resistance to the heat flows the chip to package top case.
© 2014 Exar Corporation
2/11
Rev. 1.6.0


Part Number XRP6658
Description 1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
Maker Exar Corporation
Total Page 11 Pages
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