ISL9111 Datasheet, PDF (1/15 Pages) Intersil Corporation – Low Input Voltage, High Efficiency Synchronous Boost Converter with 1A Switch

Low Input Voltage, High Efficiency Synchronous Boost
Converter with 1A Switch
ISL9111, ISL9111A
The ISL9111 and ISL9111A provide a power supply solution
for single-cell, dual-cell, or three-cell alkaline, NiCd or NiMH
battery-powered applications. The device has a typical 0.8V
start-up voltage and is capable of supplying up to 5.25V output
voltage. Both devices are guaranteed to supply 100mA from a
single-cell input and 240mA from a dual-cell input when
output is 3.3V. High 1.2MHz switching frequency allows for the
use of tiny, low-profile inductors and ceramic capacitors to
minimize the size of the solution.
The ISL9111 and ISL9111A are internally compensated, fully
integrated synchronous boost converters optimized for
efficiency with minimal external components. At light load, the
device enters skip mode and consumes only 20µA of
quiescent current, resulting in higher efficiency at light loads
and maximum battery life.
The ISL9111 and ISL9111A address both rechargeable and
non-rechargeable battery applications. The ISL9111 has a
UVLO feature, which will internally shut off at 0.7V protecting a
rechargeable battery. The ISL9111A has this feature disabled
to maximize the usable life of a non-rechargeable single cell
battery. The parts are available in fixed 3.0V, 3.3V and 5.0V
output voltage versions or an adjustable output voltage version
(ADJ). The fixed output voltage version also provides a FAULT
pin for fault condition monitoring. The ISL9111 and ISL9111A
are available in a 6 Ld SOT-23 package.
Features
• Up to 97% Efficiency at Typical Operating Conditions
• Minimum Start-up Voltage
- 0.8V (ISL9111)
- 0.6V (ISL9111A)
• Minimum Operating Voltage
- 0.7V (ISL9111)
- 0.5V (ISL9111A)
• Low Quiescent Current: 20μA (Typical)
• At V_OUT = 3.3V
- 100mA Output Current @ V_IN = 0.9V
- 240mA Output from @ V_IN = 1.8V
• Logic Control Shutdown (Iq < 1µA)
• Output Voltage Up to 5.25V
• Output Disconnect During Shutdown
• Skip Mode Under Light Load Condition
• Undervoltage Lockout (ISL9111 Only)
• Fault Protection: OVP (ADJ Version Only), OTP, Short Circuit
• 6 Ld SOT-23 Package
Applications
• Products Including Portable HDMI and USB-OTG
• Personal Medical Products
• Wireless Mouse/Keyboard
• Bluetooth Headsets
• MP3/MP4 Players/DSC
• Single-cell, Dual-cell and Triple-cell Alkaline, NiCd, NiMH
Powered Products
4.7µH
VIN
4.7µF
1
SW
6 _VIN
3
EN
5
VOUT
VFLT
1k ₄
FAULT
2
GND
VOUT
4.7µF
ISL9111: 3.0/3.3/5.0V, ISL9111A: 3.0/3.3/5.0V
FIGURE 1. TYPICAL APPLICATION
100
95
90
85
80
75
70
65
60
0.1
V_IN = 3.6V
V_IN = 1.8V ^{VIN = 0.9V}
1
10
100
I_OUT (mA)
FIGURE 2. FIXED 5V EFFICIENCY
1000
December 7, 2011
1
FN7602.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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