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XRP6124 Datasheet Preview

XRP6124 Datasheet

Non-Synchronous PFET Step-Down Controller

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January 2011
XRP6124
Non-Synchronous PFET Step-Down Controller
Rev. 1.1.0
GENERAL DESCRIPTION
The XRP6124 is a non synchronous step down
(buck) controller for up to 5Amps point of
loads. A wide 3V to 30V input voltage range
allows for single supply operations from
industry standard 3.3V, 5V, 12V and 24V
power rails.
With a proprietary Constant On-Time (COT)
control scheme, the XRP6124 provides
extremely fast line and load transient response
while the operating frequency remains nearly
constant. It requires no loop compensation
hence simplifying circuit implementation and
reducing overall component count. The
XRP76124 also implements an emulated ESR
circuitry allowing usage of ceramic output
capacitors and insuring stable operations
without the use of extra external components.
Built-in soft start prevents high inrush currents
while under voltage lock-out and output short
protections insure safe operations under
abnormal operating conditions.
The XRP6124 is available in a RoHS compliant,
green/halogen free space-saving 5-pin SOT23
package.
TYPICAL APPLICATION DIAGRAM
APPLICATIONS
Point of Load Conversions
Audio-Video Equipments
Industrial and Medical Equipments
Distributed Power Architecture
FEATURES
5A Point-of-Load Capable
Down to 1.2V Output Voltage Conversion
Wide Input Voltage Range
3V to 18V: XRP6124
4.5V to 30V: XRP6124HV
Constant On-Time Operations
Constant Frequency Operations
No External Compensation
Supports Ceramic Output Capacitors
Built-in 2ms Soft Start
Short Circuit Protection
<1µA shutdown current
RoHS Compliant, Green/Halogen Free
5-pin SOT23 Package
Figure 1: XRP6124 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

XRP6124 Datasheet Preview

XRP6124 Datasheet

Non-Synchronous PFET Step-Down Controller

No Preview Available !

XRP6124
Non-Synchronous PFET Step-Down Controller
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.
VIN (XRP6124)............................................ -0.3V to 20V
VIN (XRP6124HV)........................................ -0.3V to 32V
GATE ...................................................... VIN-GATE<8V
FB, EN ..................................................... -0.3V to 5.5V
Storage Temperature .............................. -65°C to 150°C
Power Dissipation ................................ Internally Limited
Lead Temperature (Soldering, 10 sec) ................... 300°C
ESD Rating (HBM - Human Body Model) .................... 2kV
OPERATING RATINGS
Input Voltage Range VIN (XRP6124)................3.0V to 18V
Input Voltage Range VIN (XRP6124HV)............4.5V to 30V
Junction Temperature Range ....................-40°C to 125°C
Thermal Resistance θJA .....................................191°C/W
ELECTRICAL SPECIFICATIONS
Specifications are for an Operating Junction Temperature of TJ = 25°C only; limits applying over the full Operating Junction
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 TJ = 25°C, and are provided for reference purposes
only. Unless otherwise indicated, VIN = 3.0V to 18V, TJ = –40°C to 125°C.
Parameter
UVLO Turn-On Threshold
UVLO Turn-On Threshold
UVLO Hysteresis
Operating Input Voltage Range
Shutdown VIN Current
Operating VIN Current
Reference Voltage
VSC_TH, Feedback pin Short
Circuit Latch Threshold
TON, Switch On-Time
TON, Switch On-Time
TOFF_MIN, Minimum Off-Time
Soft Start Time
EN Turn-On Threshold
EN Turn-Off Threshold
EN Bias Current
Gate Driver Pull-Down
Resistance
Gate Driver Pull-up Resistance
tr, gate rise time
tf, gate fall time
VIN - GATE voltage difference
VIN - GATE voltage difference
Min.
2.5
3.8
3.0
4.5
0.792
0.784
0.50
0.4
0.4
2
5.5
2.6
Typ.
2.8
4.2
0.1
1.5
0.5
0.8
0.8
0.55
0.5
0.5
250
2
0.01
6
5
45
35
6.4
Max.
3.0
4.5
18
30
3
1
0.808
0.816
0.65
0.6
0.6
350
1
0.1
9
8
8
Units
V
V
V
V
V
µA
mA
V
V
V
µs
µs
ns
ms
V
V
µA
ns
ns
V
V
• XRP6124
• XRP6124HV
Conditions
• XRP6124
• XRP6124HV
EN=0V, VIN=12V
VFB=1.2V and after fault
• VIN=12V, XRP6124
• VIN=24V, XRP6124HV
• VIN=12V
CGATE=1nF
CGATE=1nF
• VIN=12V
• VIN=3.0V
© 2011 Exar Corporation
2/12
Rev. 1.1.0


Part Number XRP6124
Description Non-Synchronous PFET Step-Down Controller
Maker Exar
Total Page 12 Pages
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