ISL8117 Datasheet, PDF (1/23 Pages) Intersil Corporation – Synchronous Step-down PWM Controller

DATASHEET
Synchronous Step-down PWM Controller
ISL8117
The ISL8117 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.
The ISL8117 uses the valley current modulation technique to
bring hassle-free power supply design with minimal number of
components and complete protection from unwanted events.
The ISL8117 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 or
easy to assemble 6.4mmx5mm 16 Ld HTSSOP package. Both
packages use an EPAD to improve thermal dissipation and
noise immunity. Low pin count, less number of external
components and default internal values, makes the ISL8117
an ideal solution for quick to market simple power supply
designs. The ISL8117 utilizes internal loop compensation and
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
even with fixed internal compensations. The unique
DEM/Skipping mode at light-load dramatically lowers standby
power consumption with consistent output ripple over different
load levels.
Related Literature
• UG020, “ISL8117EVAL2Z Evaluation Board User Guide”
• UG021, “ISL8117DEMO2Z Demonstration Board User Guide”
• UG030, “ISL8117EVAL1Z Evaluation Board User Guide”
• UG031, “ISL8117DEMO1Z Demonstration 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)
• Complete protection
- Overcurrent, overvoltage, over-temperature, undervoltage
• Pb-free (RoHS compliant)
Applications
• PLC and factory automation
• Amusement machines
• Security surveillance
• Server and data centers
• Switcher and routers
• Telecom and datacom
• LED panels
1 EXTBIAS
VIN
VIN 16
2 EN
BOOT 15
3 CLKOUT
UGATE 14
4
MOD
SYNC
SGND
5 PGOOD
PHASE 13
ISEN 12
6 RT
7 SS/TRK
8 FB
VCC5V 11
LGATE
OCS
10
PGND 9
VOUT
FIGURE 1. TYPICAL APPLICATION
100
98
96
94
92
90
88
86
840
V_IN = 18V
V_IN = 24V
V_IN = 60V
V_IN = 36V _{VIN = 48V}
2
4
6
8
10
12
14
16
OUTPUT CURRENT (A)
FIGURE 2. EFFICIENCY
June 4, 2015
1
FN8666.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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