ISL8117A Datasheet, PDF (1/23 Pages) Intersil Corporation – Synchronous Step-Down PWM Controller

DATASHEET
Synchronous Step-Down PWM Controller
ISL8117A
The ISL8117A is a synchronous buck controller to generate
POL voltage rails and bias voltage rails for a wide variety of
applications in industrial and general purpose segments. Its
wide input and output voltage ranges make it suitable for
telecommunication and after-market automotive applications.
ISL8117A is a derivative from the ISL8117 by replacing its
CLKOUT pin with COMP pin to provide flexibility to customers to
configure the voltage loop compensation externally.
The ISL8117A uses the valley current modulation technique to
bring a hassle-free power supply design with minimal number
of components and complete protection from unwanted
events.
The ISL8117A offers programmable soft-start and enable
functions along with a power-good indicator for ease of supply
rail sequencing and other housekeeping requirements. In ideal
situations, a complete power supply circuit can be designed
with 10 external components and provide OV/OC/OT
protections in a space conscious 16 Ld 4mmx4mm QFN
package. The package uses an EPAD to improve thermal
dissipation and noise immunity. Low pin count, less number of
external components and default internal values, makes the
ISL8117A an ideal solution for quick to market simple power
supply designs. The ISL8117A utilizes single resistor settings
for other functions such as operating frequency and
overcurrent protection. Its current mode control with V_IN
feed-forward enables it to cover various applications. The
unique DEM/Skipping mode at light load dramatically lowers
standby power consumption with consistent output ripple over
different load levels.
Related Literature
• UG049, “ISL8117AEVAL1Z Evaluation Board User Guide”
• UG050, “ISL8117AEVAL2Z Evaluation Board User Guide”
Features
• Wide input voltage range: 4.5V to 60V
• Wide output voltage range: 0.6V to 54V
• Light-load efficiency enhancement
- Low ripple diode emulation mode with pulse skipping
• Programmable soft-start
• Supports prebiased output with SR soft-start
• Programmable frequency: 100kHz to 2MHz
• External sync
• PGOOD indicator
• Forced PWM
• Adaptive shoot-through protection
• No external current sense resistor
- Use lower MOSFET r_DS(ON)
• Functional pins with default design values
- EN, RT, SS/TRK, MOD/SYNC, LGATE/OCS
• Complete protection
- Overcurrent, overvoltage, over-temperature, undervoltage
• Pb-free (RoHS compliant)
Applications
• PLC and factory automation
• Industrial equipments
• Security surveillance
• Server and data centers
• Switcher and routers
• Telecom and datacom
• LED panels
VIN
16
15
14
13
1 ^MOD
SYNC
2 PGO OD
3 RT
4 ^SS
TRK
5
ISL811 7A
SGND
6
7
UGATE 12
PHASE 11
ISEN 10
VCC5V 9
8
FIGURE 1. TYPICAL APPLICATION
August 31, 2015
1
FN8752.0
100
98
96
94
92
VOUT
90
88
V_IN = 24V
V_IN = 60V
V_IN = 48V
86
V_IN = 18V
V_IN = 36V
840
2
4
6
8
10 12 14 16
OUTPUT CURRENT (A)
FIGURE 2. EFFICIENCY
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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