ISL80030 Datasheet, PDF (1/20 Pages) Intersil Corporation – 3A Synchronous Buck Converter In 2x2 DFN Package

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
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.
The ISL80030, ISL80030A, ISL80031 and ISL80031A integrate
very low r_DS(ON) MOSFETs in order to maximize efficiency. In
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.
The ISL80031, ISL80031A configured for PFM discontinuous
conduction operation, provides high efficiency by reducing
switching losses at light loads.
ISL80030, ISL80030A configured for PWM pulse width
modulation operation, provides a fast transient response,
which helps reduce the output noise and RF interference.
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
64mm² area.
Features
• V_IN range 2.7V to 5.5V
• 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
• Power-good and enable
• 100% duty cycle
• Internal soft-start and soft-stop
• V_IN undervoltage lockout and V_OUT overvoltage protection
• Up to 95% peak efficiency
Applications
• General purpose POL
• Industrial, instrumentation and medical equipment
• Telecom and networking equipment
• Game console
VIN
GND
+2.7V …+5.5V _{1 VIN}
C1
22µF
2 _VIN
ISL80030/ISL80031
PHASE ⁸
PGND ⁷
L1
C2
22µF
+1.8V/3A
EN
3 _EN
PGND ⁶
C3
22pF
R1
PG
4 _PG
EPAD
FB
5
0.6V
200k 1%
R2
100k 1%
9
VOUT
GND
R₁
=
R₂


V^---V--F^--O--B^--
– 1_
(EQ. 1)
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION
100
V_OUT = 3.3V
93
87
80
V_OUT = 1.8V
73
67
V_OUT = 2.5V
60
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, ISL80031, V_IN = 5V, T_A = +25°C
July 20, 2015
1
FN8766.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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