ISL9110A Datasheet, PDF (1/16 Pages) Intersil Corporation – 1.2A High Efficiency Buck-Boost Regulator

1.2A High Efficiency Buck-Boost Regulator
ISL9110A
The ISL9110A is a highly-integrated Buck-Boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. Unlike other Buck-Boost regulators, this
regulator automatically transitions between operating modes
without significant output disturbance.
This part is capable of delivering up to 1.2A output current, and
provides excellent efficiency due to its fully synchronous 4-switch
architecture. No-load quiescent current of only 35µA also
optimizes efficiency under light-load conditions. Forced PWM
and/or synchronization to an external clock may also be selected
for noise sensitive applications.
The ISL9110A is designed for standalone applications and
supports 3.3V and 5V fixed output voltages or variable output
voltages with an external resistor divider. Output voltages as low
as 1V, or as high as 5.2V are supported using an external resistor
divider.
The ISL9110A requires only a single inductor and very few
external components. Power supply solution size is minimized by
a 2.4mm x 1.6mm WLCSP package and a 2.5MHz switching
frequency, which further reduces the size of external
components.
Features
• Accepts Input Voltages Above or Below Regulated Output
Voltage
• Automatic and Seamless Transitions Between Buck and Boost
Modes
• Input Voltage Range: 1.8V to 5.5V
• Output Current: Up to 1.2A
• High Efficiency: Up to 95%
• 35µA Quiescent Current Maximizes Light-load Efficiency
• 2.5MHz Switching Frequency Minimizes External Component
Size
• Selectable Forced-PWM Mode and External Synchronization
• Fully Protected for Overcurrent, Over-temperature and
Undervoltage
• Small 2.4mmx1.6mm WLCSP Package
Applications
• Regulated 3.3V from a Single Li-Ion Battery
• Smart Phones and Tablet Computers
• Handheld Devices
• Point-of-Load Regulators
Related Literature
• See AN1750 “ISL9110A Evaluation Board User Guide”
VIN = 1.8V TO 5.5V
C1
10µF
STATUS
OUTPUTS
ISL9110AIITNZ
A1
B1 PVIN
A2
LX1 _B2
C1 _VIN
D3 _MODE
C2 _EN
D2 _BAT
D1 _PG
A4
LX2 B4
A5
VOUT B5
FB ^D5
GND
PGND
L1
2.2µH
VOUT = 3.3V/1A
C2
10µF
FIGURE 1. TYPICAL APPLICATION
100
95
90
V_IN = 5V
85
80 V_IN = 3V
V_IN = 2.5V
75
V_OUT = 3.3V
70
0.01
0.05
I_OUT (A)
0.25
FIGURE 2. EFFICIENCY
1.25
June 8, 2012
1
FN8299.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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