ISL85415 Datasheet, PDF (1/23 Pages) Intersil Corporation – Wide VIN 500mA Synchronous Buck Regulator

Wide V_IN 500mA Synchronous Buck Regulator
ISL85415
Features
The ISL85415 is a 500mA Synchronous buck regulator with an
input range of 3V to 36V. It provides an easy to use, high
efficiency low BOM count solution for a variety of applications.
The ISL85415 integrates both high-side and low-side NMOS
FET's 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 500kHz
but may also be programmed using an external resistor from
300kHz to 2MHz. The ISL85415 has the ability to utilize
internal or external compensation. By integrating both NMOS
devices and providing internal configuration options, minimal
external components are required, reducing BOM count and
complexity of design.
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 4mmx3mm DFN plastic
package with an operation temperature range of -40°C to
+125°C
Related Literature
• See AN1859, “ISL85415EVAL1Z Wide V_IN 500mA
Synchronous Buck Regulator”
• Wide input voltage range 3V to 36V
• 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 fixed (500kHz) or adjustable Switching frequency
300kHz to 2MHz
• Continuous output current up to 500mA
• Internal or external Soft-start
• Minimal external components required
• Power-good and enable functions available.
Applications
• Industrial control
• Medical devices
• Portable instrumentation
• Distributed Power supplies
• Cloud Infrastructure
TABLE 1. KEY DIFFERENCES BETWEEN PARTS
PART
TEMP RANGE
NUMBER
(°C)
EN THRESHOLD
PG DELAY
ISL85415 -40°C to +125°C Standard TTL
input
10% of soft-start
time
ISL85415A -40°C to +85°C High accuracy
2ms
NOTE: See Electrical specifications for more details on the ISL85415.
CBOOT
100nF
VOUT
COUT
10µF
L1
22µH
CVIN
10µF
1 SS
2
SYNC
3 _BOOT
4 _VIN
5 _PHASE
6
PGND
GND
FS ¹²
11
COMP
10
FB
9
VCC
PG
EN
R2
R3
CVCC
1µF
CFB
INTERNAL DEFAULT PARAMETER SELECTION
FIGURE 1. TYPICAL APPLICATION
100
95
V_IN = 15V
V_IN = 12V
V_IN = 5V
90
85
80
75
70
V_IN = 24V
65
V_IN = 33V
60
55
50
0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, V_OUT = 3.3V
July 15, 2013
1
FN8373.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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