ISL9110 Datasheet, PDF (1/20 Pages) Intersil Corporation – 1.2A High Efficiency Buck-Boost Regulators Output Current: Up to 1.2A

1.2A High Efficiency Buck-Boost Regulators
ISL9110, ISL9112
The ISL9110 and ISL9112 are highly-integrated Buck-Boost
switching regulators that accept input voltages either above or
below the regulated output voltage. Unlike other Buck-Boost
regulators, these regulators automatically transition between
operating modes without significant output disturbance.
Both parts are capable of delivering up to 1.2A output current,
and provide excellent efficiency due to their 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 ISL9110 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 ISL9112 supports a broader set of programmable features
that may be accessed via an I²C bus interface. With a
programmable output voltage range of 1.9V to 5V, the ISL9112
is ideal for applications requiring dynamically changing supply
voltages. A programmable slew rate can be selected to provide
smooth transitions between output voltage settings.
The ISL9110 and ISL9112 require only a single inductor and very
few external components. Power supply solution size is
minimized by a tiny 3mmx3mm 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
• I²C Interface (ISL9112)
• Fully Protected for Overcurrent, Over-temperature and
Undervoltage
• Small 3mmx3mm TDFN 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 AN1648 “ISL9110IRTNZ/IRT7Z/IRTAZ-EVAL1Z Evaluation
Board User Guide”
• See AN1647 “ISL9112IRTNZ/IRT7Z-EVAL1Z Evaluation Board
User Guide”
VIN =
1.8V TO 5.5V
C1
10µF
STATUS
OUTPUTS
ISL9110IRTNZ
5 _PVIN
LX1 ⁴
6 _VIN
10 _MODE
9 _EN
8 _BAT
7 _PG
LX2 ²
VOUT ¹
FB ¹²
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
1.25
FIGURE 2. EFFICIENCY
June 16, 2011
1
FN7649.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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