XR76201 Datasheet, PDF (1/16 Pages) Exar Corporation – 40V PowerBloxTM 1.5A Synchronous Step-Down COT Regulator

XR76201
40V PowerBlox^TM 1.5A Synchronous
Step-Down COT Regulator
Description
The XR76201 is a synchronous step-down regulator combining the
controller, drivers, bootstrap diode and MOSFETs in a single package
for point-of-load supplies. The XR76201 is capable of supplying
steady state loads of 1.5A. A wide 5V to 40V input voltage range
allows for single supply operation from 12V battery systems required
to withstand load dump, industry standard 24V ±10%, 18V to 36V, and
rectified 18VAC and 24VAC rails.
With a proprietary emulated current mode Constant On-Time (COT)
control scheme, the XR76201 provides extremely fast line and load
transient response using ceramic output capacitors. They require
no loop compensation, simplifying circuit implementation and
reducing overall component count. The control loop also provides
0.05% load and 0.15% line regulation and maintains constant
operating frequency. A selectable power saving mode allows the user
to operate in Discontinuous Conduction Mode (DCM) at light current
loads thereby significantly increasing the converter efficiency.
A host of protection features, including overcurrent, over temperature,
short-circuit and UVLO, helps achieve safe operation under abnormal
operating conditions.
The XR76201 is available in a RoHS-compliant, green/halogen-free
space-saving 5mm x 5mm QFN package.
Typical Application
FEATURES
■■ Controller, drivers, bootstrap diode and
MOSFETs integrated in one package
■■ 1.5A step-down regulator
Wide 5V to 40V input voltage range
>0.6V adjustable output voltage
■■ Proprietary constant on-time control
No loop compensation required
Stable ceramic output capacitor
operation
Programmable 100ns to 1µs on-time
Constant 400kHz to 800kHz
frequency
■■ Selectable CCM or CCM/DCM
CCM/DCM for high efficiency at
light-load
CCM for constant frequency at
light-load
■■ Programmable hiccup current limit with
thermal compensation
■■ Precision enable and power good flag
■■ Programmable soft-start
■■ 30-pin 5mm x 5mm QFN package
APPLICATIONS
■■ Automotive systems
■■ Industrial
■■ Military
Ordering Information – back page
VIN
ENABLE/MODE
POWER GOOD
CIN
RPGOOD
CVCC CSS
RON
VIN
PVIN
EN/MODE
BST
PGOOD
SW
VCC
SS
XR76201 _ILIM
TON
FB
AGND
PGND
CBST
L1
RLIM
CFF R1
R2
VOUT
COUT
Figure 1. Typical Application
3.340
3.330
3.320
3.310
3.300
3.290
3.280
3.270
3.260
5
10 15 20 25 30 35 40
VIN (V)
Figure 2. Line Regulation
REV1A
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