ISL8115 Datasheet, PDF (1/24 Pages) Intersil Corporation – High Voltage Synchronous Buck PWM Controller with Integrated Gate Driver and Current Sharing Capability

High Voltage Synchronous Buck PWM Controller with
Integrated Gate Driver and Current Sharing Capability
ISL8115
The ISL8115 is a synchronous buck PWM controller with
current sharing capability. The current sharing function allows
multiple modules to be connected in parallel to achieve higher
output current and to reduce input and output ripple current,
resulting in fewer components and reduced output dissipation.
Utilizing voltage-mode control with input voltage feed-forward
compensation, the ISL8115 maintains a constant loop gain for
optimal transient response, especially for applications with a
wide input voltage range.
The ISL8115 protects against overcurrent conditions by
inhibiting the PWM operation while monitoring the current
with DCR of the output inductor, or a precision resistor. It also
has a pre-POR overvoltage protection option, which provides
some protection to the load if the upper MOSFET(s) is shorted.
The ISL8115 features remote ground sensing, programmable
input voltage UVLO, output under/overvoltage protection,
power-good indication, and fault Hand Shake capability.
Applications
• Power supply for datacom/telecom and POL
• Wide input voltage range buck regulators
• High current density power supplies RF power amplifier bias
compensation
Features
• Wide V_IN range operation: 2.97V to 36V; up to 5.5V output
and 30A load current per phase
• Fast transient response
- Voltage-mode PWM leading-edge modulation with
non-linear control
- Input voltage feed-forward
• Integrated 5V high speed 4A MOSFET gate drivers
- Internal bootstrap diode
• Excellent output voltage regulation
- 0.6V ±1.0% internal reference (-40°C ~ 125°C)
- 0.6V ±0.7% internal reference (-40°C ~ 105°C)
- Differential voltage sensing
• Excellent current balancing and overcurrent protection
- Peak and average overcurrent protection
- Output current monitor on the ISET pin
• Oscillator programmable from 150kHz to 1.5MHz
- Frequency synchronization to external clock signal
• Diode emulation mode for light load efficiency improvement
• Power-good open drain output
• Pre-bias start-up function
• Output OVP, UVP; OTP
• Adjustable Soft-Start
CPLL
2.2nF
RPLL
5.11k
ROS1
2k
RFB3 3k
CFB3 _RFB3
8.2nF 49.9Ω
CFB2
33nF
RFB2
787
CFB1
2.2nF
ROS
2k
3k
RFB1
C
0.22µF
1.27k
RISET
10k
CISET
1nF
CPLL_H
390pF
RCONF
11.8k
RSS
18.2k
RFSET
113k
REN_L
10k
25 _GND
19 _ISET
20 _ISHARE
21 _{PLL_COMP}
U1
22 _{CONF ISL8115FRTZ}
23 _CLKOUT
24 _SS
12
LGATE
11
PVCC
PHASE ¹⁰
CPVCC
4.7µF
QL
4
RPCC 2*RJK0301
2.2Ω
UGATE ⁹
BOOT ⁸
VIN ⁷
CBOOT
0.22µF
CVIN 2.2µF
4
QH
2*RJK0305
REN_U
68.1k
CVCC
2.2µF
RFF_L
RVIN
140k
4.12k
2Ω
RFF_H
33.2k
R
2.8k
CVIN1
4*10µF
1
2
LOUT
320nH, 0.53mΩ, PA1513-321
FIGURE 1. TYPICAL APPLICATION CIRCUIT, 10V-15V INPUT, 1.5V/30A OUTPUT
2*6TPF330M9L;
4*100µF; 4*1µ
COUT
VOUT
1.5V/30A
10V-15V
VIN
September 23, 2013
1
FN8272.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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