DATASHEET
3A Synchronous Buck Converter In 2x2 DFN Package
ISL80030, ISL80030A, ISL80031, ISL80031A
The ISL80030, ISL80030A, ISL80031 and ISL80031A are highly
efficient, monolithic, synchronous step-down DC/DC converters
Features
• V range 2.7V to 5.5V
that can deliver up to 3A of continuous output current from a 2.7V
to 5.5V input supply. They use peak current mode control
architecture to allow very low duty cycle operation. They operate
at either a 1MHz or 2MHz switching frequency, thereby providing
superior transient response and allowing for the use of small
inductors. They have excellent stability.
IN
• Up to 3A of output current
• Switching frequency is 1MHz or 2MHz (see Table 1 on page 3)
• 35µA quiescent current (ISL80031/A)
• Overcurrent and short-circuit protection
• Over-temperature/thermal protection
• Negative current protection
The ISL80030, ISL80030A, ISL80031 and ISL80031A integrate
very low r
MOSFETs in order to maximize efficiency. In
DS(ON)
addition, since the high-side MOSFET is a PMOS, the need for a
Boot capacitor is eliminated, thereby reducing external
component count. They can operate at 100% duty cycle.
• Power-good and enable
• 100% duty cycle
The ISL80031, ISL80031A configured for PFM discontinuous
conduction operation, provides high efficiency by reducing
switching losses at light loads.
• Internal soft-start and soft-stop
• V undervoltage lockout and V
IN
overvoltage protection
OUT
• Up to 95% peak efficiency
ISL80030, ISL80030A configured for PWM pulse width
modulation operation, provides a fast transient response,
which helps reduce the output noise and RF interference.
Applications
• General purpose POL
These devices are offered in a space saving 8 pin 2mmx2mm
DFN lead-free package with exposed pad for improved thermal
performance. The complete converter occupies less than
• Industrial, instrumentation and medical equipment
• Telecom and networking equipment
• Game console
2
64mm area.
100
ISL80030/ISL80031
L1
V
= 3.3V
OUT
+1.8V/3A
+2.7V …+5.5V
1
2
3
4
8
7
6
VIN
PHASE
PGND
PGND
FB
VOUT
GND
VIN
VIN
EN
93
87
80
73
67
60
C1
22µF
C2
22µF
GND
C3
EN
PG
22pF
R1
V
= 1.8V
OUT
200k 1%
5
0.6V
PG
EPAD
R
2
100k 1%
V
= 2.5V
OUT
9
V
O
(EQ. 1)
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
LOAD (A)
-----------
R
= R
– 1
1
2
VFB
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION
FIGURE 2. EFFICIENCY vs LOAD, ISL80031, V = 5V, T = +25°C
IN
A
July 20, 2015
FN8766.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
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