ISL85005 Datasheet, PDF (1/22 Pages) Intersil Corporation – Internal or external compensation options

DATASHEET
4.5V to 18V Input, 5A High Efficiency Synchronous
Buck Regulator
ISL85005, ISL85005A
The ISL85005 and ISL85005A are monolithic, synchronous
buck regulators with integrated 5A, 18V high-side and low-side
FETs. These devices also provide an integrated bootstrap diode
for the high-side gate driver to reduce the external parts count.
These devices have a wide input voltage range to support
applications with input voltage from multi-cell batteries or
regulated 5V and 12V power rails.
The ISL85005 and ISL85005A regulate the output voltage
with current mode control and have an internal oscillator. The
switching frequency of the ISL85005 is internally set as
500kHz, and can be synchronized to an external clock signal
with frequency ranges from 300kHz to 2MHz. The ISL85005A
has a fixed 500kHz switching frequency.
The ISL85005 has a fixed 2.3ms soft-start, while the
ISL85005A features programmable soft-start to limit inrush
current during startup. With SS pin floating, the soft-start time
of ISL85005A is also 2.3ms.
The ISL85005 can be configured in either forced Continuous
Conduction Mode (CCM) or Diode Emulation Mode (DEM). DEM
enables high efficiency at light-load conditions. The
ISL85005A always operates in forced CCM.
The ISL85005 and ISL85005A have built-in protections
including input UVLO protection, input and output overvoltage
protection, high-side cycle-by-cycle current limit, low-side
forward current limit and reverse current limit, and thermal
shutdown.
Related Literature
• For a full list of related documents, visit our website
- ISL85005, ISL85005A product pages
Features
• 4.5V to 18V input voltage range
• Internal 5A, 18V high-side and low-side MOSFET switches
• ±1%, 0.8V feedback voltage reference
• Integrated bootstrap diode with undervoltage detection
• Current mode control with internal slope compensation
• Internal or external compensation options
• Default internally set 500kHz switching frequency
• Synchronization capability to external clock (ISL85005)
• Diode Emulation Mode (DEM) and forced CCM (FCCM)
options (ISL85005)
• Adjustable soft-start time (ISL85005A)
• Output Power-Good (PG) indicator
• Input undervoltage lockout (UVLO), input and output
overvoltage protection
• High-side cycle-by-cycle current limit, low-side forward and
reverse overcurrent protection, and thermal shutdown
• Small 12-pin 3mmx4mm Dual Flat No-Lead (DFN) package
with EPAD for enhanced thermal performance
Applications
• Network and communication equipments
• Battery powered systems
• Multifunction printers
• Point-of-load regulators
• Standard 12V rail supplies
• Embedded computing systems
Typical Application
GND = DEM; VCC = FCCM
MODE
PG
EN
R₁
R₂
C₁
ISL85005
SYNC/
1 MODE
BOOT 12
2 PG
VDD 11
3 EN
4 FB
PGND
VIN 10
VIN 9
5 COMP
PHASE 8
6 AGND
PHASE 7
C₄
V_IN
4.5V TO 18V
C₃
C₅
L₁
C₈
C₆
V_OUT
5A MAX
C₉
FIGURE 1. ISL85005 WITH INTERNAL COMPENSATION
95
90
85
80
75
70
65
12V TO 5V
12V TO 3.3V
60
12V TO 1.8V
55
50
0
1
2
3
4
5
OUTPUT CURRENT (A)
FIGURE 2. EFFICIENCY vs OUTPUT CURRENT
November 28, 2016
1
FN8871.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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