ISL85413 Datasheet, PDF (1/20 Pages) Intersil Corporation – Wide VIN 300mA Synchronous Buck Regulator

DATASHEET
Wide V_IN 300mA Synchronous Buck Regulator
ISL85413
Features
The ISL85413 is a 300mA synchronous buck regulator with an
input range of 3.5V to 40V. It provides an easy to use, high
efficiency low BOM count solution for a variety of applications.
The ISL85413 integrates both high-side and low-side NMOS
FETs and features a PFM mode for improved efficiency at light
loads. This feature can be disabled if forced PWM mode is
desired. The part switches at a default frequency of 700kHz.
By integrating both NMOS devices and providing internal
configuration, minimal external components are required,
reducing BOM count and complexity of design.
• Wide input voltage range of 3.5V to 40V
• Synchronous operation for high efficiency
• No compensation required
• Integrated high-side and low-side NMOS devices
• Selectable PFM or forced PWM mode at light loads
• Internal switching frequency 700kHz
• Continuous output current up to 300mA
• Internal soft-start
With the wide V_IN range and reduced BOM, the part provides
an easy to implement design solution for a variety of
applications while giving superior performance. It will provide a
very robust design for high voltage industrial applications as
well as an efficient solution for battery powered applications.
The part is available in a small Pb-free 3mmx3mm TDFN
plastic package with an operation junction temperature range
of -40°C to +125°C.
Related Literature
• AN1929, “ISL85413EVAL1Z, ISL85412EVAL1Z Evaluation
Boards”
• Minimal external components required
• Power-good and enable functions available
Applications
• Industrial control
• Medical devices
• Portable instrumentation
• Distributed power supplies
• Cloud infrastructure
• AN1931, “ISL85413DEMO1Z, ISL85412DEMO1Z Wide VIN
Synchronous Buck Regulator - Short Form”
V_OUT
U1 ISL85413
R1
C4
MODE
1 _MODE
FB ⁸
C6
2 _BOOT
VCC
7
C5
R2
VIN
+3.5 ... +40V
0.1µF
3 _VIN
1µF
PG ⁶
PG
GND
C1
20µF
4 _PHASE
EN ⁵
EN
f_SW = 700kHz
VOUT
MAX 300mA
L1
GND
C8
Device must be
connected to GND
plane with Vias.
FIGURE 1. TYPICAL APPLICATION
100
90
80
70
1.5V_OUT
3.3V_OUT
60
1.0V_OUT ^1.2VOUT
1.8V_OUT
2.5V_{OUT 5.0VOUT}
50
40
0 0.03 0.06 0.09 0.12 0.15 0.18 0.21 0.24 0.27 0.30
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, V_IN = 12V
March 13, 2015
1
FN8379.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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