ISL8130 Datasheet, PDF (1/24 Pages) Intersil Corporation – Advanced Single Universal Pulse-Width Modulation (PWM) Controller

Advanced Single Universal Pulse-Width Modulation
(PWM) Controller
ISL8130
The ISL8130 is a versatile controller that integrates control,
output adjustment, monitoring and protection functions into a
single package for synchronous buck, standard boost, SEPIC
and flyback topologies.
The ISL8130 provides simple, single feedback loop, voltage
mode control with fast transient response. The output voltage
of the converter can be precisely regulated to as low as 0.6V.
The switching frequency is adjustable from 100kHz to 1.4MHz.
The error amplifier features a 15MHz gain-bandwidth product
and 6V/µs slew rate that enables fast transient response. The
PWM duty cycle ranges from 0% to 100% in transient
conditions. The capacitor from the ENSS pin to ground sets
soft-start slew rate.
The ISL8130 monitors the output voltage and generates a
PGOOD (power-good) signal when soft-start sequence is
complete and the output is within regulation. A built-in
overvoltage protection circuit prevents the output voltage from
going typically above 115% of the set point. For a buck and
buck-boost configuration, protection from overcurrent
conditions is provided by monitoring the r_DS(ON) of the upper
MOSFET to inhibit the PWM operation appropriately. This
approach improves efficiency by eliminating the need for a
current sensing resistor. For other topologies, overcurrent
protection is achieved using a current sensing resistor.
Features
• Universal controller for multiple DC/DC converters
• Wide input range
- 4.5V to 5.5V
- 5.5V to 28V
• Programmable soft-start
• Supports pre-biased load applications
• Resistor-selectable switching frequency
- 100kHz to 1.4MHz
• External reference tracking mode
• Fast transient response
- High-bandwidth error amplifier
• Extensive circuit protection functions
- Overvoltage, overcurrent, shutdown
• Pb-free (RoHS compliant)
Applications
• Power supplies for microprocessors/ASICs
• Ethernet routers and switchers
• Medical instrument power supplies
Related Literature
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
5.6V to 16V
C₇
0.1µF
C₁
C₂
C₃
VIN VCC5
PVCC
E_NSS
RT
47.5kΩ
R₂
0.1µF
C₈
PGOOD
CDEL
SGND
FB
MONITOR AND
PROTECTION
OSC
REF
-
+
+
-
C₅
C₄
R₁ 499Ω
OCSET
ISEN
R_cs
5mΩ
L₁
LGATE ^10µH
BOOT
UGATE
PHASE
D₁
C₉ C10
Q₁
220µF x 2
R₃
3.32kΩ
10kΩ
R₆
C₁₅
470pF
C₁₁ ^COMP
470pF
R₅ ^C12
12.1kΩ 47nF
R₄
174kΩ
REFIN
REFOUT
C₁₄
2.2µF
FIGURE 1. BOOST CONVERTER
C₆
32V
October 5, 2012
1
FN7954.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.