ISL91117 Datasheet, PDF (1/12 Pages) Intersil Corporation – True input-output disconnect when disabled

High Efficiency Synchronous Boost Converter with
4.2A Switches and Output Disconnect
ISL91117
The ISL91117 is a highly-integrated boost switching regulator
for battery powered applications. The device provides a power
supply solution for products using dual-cell or three-cell
alkaline, NiCd or NiMH, or one-cell Li-ion or Li-polymer battery.
This device is capable of delivering an output current of 1.5A
with PVIN = 3.3V and VOUT = 5V. The use of a synchronous
rectifier maximizes efficiency at high loads. No-load quiescent
current of only 35µA optimizes efficiency under light-load
conditions. Forced PWM and/or synchronization to an external
clock may also be selected for noise sensitive applications.
The ISL91117 is designed for standalone applications and
supports 5V fixed output voltage or variable output voltages
with an external resistor divider. Power supply solution size is
minimized by a 2.34mm x 1.72mm WLCSP and a 2.6MHz
switching frequency, which allows for the use of tiny,
low-profile inductors and ceramic capacitors to minimize the
size of the solution.
Related Literature
• AN1918, ISL91117II7-EVZ, ISL91117IIA-EVZ Evaluation
Boards
Features
• Input voltage range: 1.8V to 4.8V
• Fixed 5V or adjustable output
• Output current: up to 1.5A (PVIN = 3.3V, VOUT = 5V)
• High efficiency: up to 96%
• 35µA quiescent current maximizes light-load efficiency
• True input-output disconnect when disabled
• 2.6MHz switching frequency minimizes external component
size
• Selectable forced-PWM mode and external synchronization
• Fully protected for short-circuit, over-temperature and
undervoltage
• Small 2.34mm x 1.72mm WLCSP
Applications
• Smart phones and tablets
• Wireless communication devices
• Products including portable HDMI and USB-OTG
L1 1µH
VIN =
1.8V TO 4.8V
C1
22µF
BLKG
PVIN
VOUT
VIN ISL91117
EN
FB
MODE
VOUT = 5V
C2
2x22µF
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION
100
95
90
85
80
75
70
65
60
55
50
0.1
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
VIN = 2.7V
1
10
100
LOAD CURRENT (mA)
1000
FIGURE 2. EFFICIENCY vs LOAD CURRENT (VOUT = 5V)
March 7, 2014
1
FN8569.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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