DATASHEET
ISL9111, ISL9111A
Low Input Voltage, High Efficiency Synchronous Boost Converter with 1A Switch
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.
FN7602
Rev.4.00
Jun 4, 2012
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
100
95
1
VOUT
V
IN
= 3.6V
90
EFFICIENCY (%)
5
VOUT
4.7µF
SW
VIN
4.7µF
6
3
VIN
EN
85
80
75
70
65
60
55
V
IN
= 1.8V
V
IN
= 0.9V
V
FLT
1k
4
FAULT
GND
2
ISL9111: 3.0/3.3/5.0V, ISL9111A: 3.0/3.3/5.0V
50
0.1
1
10
I
OUT
(mA)
100
1000
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. FIXED 5V EFFICIENCY
FN7602 Rev.4.00
Jun 4, 2012
Page 1 of 15
ISL9111, ISL9111A
Pin Configurations
FIXED (5.0V/3.3V/3.0V)
(6 LD SOT-23)
TOP VIEW
SW
GND
EN
1
2
3
6
5
4
VIN
VOUT
FAULT
ADJUSTABLE OUTPUT
(6 LD SOT-23)
TOP VIEW
SW
GND
EN
1
2
3
6
5
4
VIN
VOUT
FB
Pin Descriptions
FIXED (5.0V, 3.3V, 3.0V)
PIN NUMBER
1
2
3
ADJUSTABLE OUTPUT
PIN NUMBER
1
2
3
SYMBOL
SW
GND
EN
PIN DESCRIPTION
The SW pin is the switching node of the power converter. Connect one terminal of
the inductor to the SW pin and the other to power input.
System ground
The EN pin is an active-high logic input for enabling the device. When asserted high,
the boost function begins. When asserted low, the device is completely disabled,
and current is blocked from flowing from the SW pin to the output and vice versa.
This pin should be tied either high to enable the device or low to disable.
Fault output; outputs logic LOW under a number of fault conditions (see Table 1 on
page 10).
Feedback pin of the converter. Connect voltage divider resistors between VOUT, FB
and GND for desired output. See Figures 3A, 4A, and 5A.
Device output
Device input supply pin. Connect a 4.7µF ceramic capacitor to the power ground.
4
-
5
6
-
4
5
6
FAULT
FB
VOUT
VIN
FN7602 Rev.4.00
Jun 4, 2012
Page 4 of 15
ISL9111, ISL9111A
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL9111EH30Z-T
ISL9111EH30Z-T7A
ISL9111EH33Z-T
ISL9111EH33Z-T7A
ISL9111EH50Z-T
ISL9111EH50Z-T7A
ISL9111EHADJZ-T
ISL9111EHADJZ-T7A
ISL9111AEH30Z-T
ISL9111AEH30Z-T7A
ISL9111AEH33Z-T
ISL9111AEH33Z-T7A
ISL9111AEH50Z-T
ISL9111AEH50Z-T7A
ISL9111AEHADJZ-T
ISL9111AEHADJZ-T7A
ISL9111H30EV1Z
ISL9111H33EV1Z
ISL9111H50EV1Z
ISL9111HADJEV1Z
ISL9111AH30-EVZ
ISL9111AH33-EVZ
ISL9111AH50-EVZ
ISL9111AHADJ-EVZ
NOTES:
1. Please refer to Tech Brief
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL9111, ISL9111A.
For more information on MSL please see Tech Brief
TB363.
4. The part marking is located on the bottom of the part.
GAKA
GAKA
GALA
GALA
GAMA
GAMA
GARA
GARA
GBAA
GBAA
GBAB
GBAB
GBAC
GBAC
GBAD
GBAD
PART
MARKING
(Note 4)
V
OUT
(V)
3.0
3.0
3.3
3.3
5.0
5.0
Adjustable
Adjustable
3.0
3.0
3.3
3.3
5.0
5.0
Adjustable
Adjustable
TEMP RANGE
(°C)
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
-20 to +85
PACKAGE
(Pb-free)
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
6 Ld SOT-23
PKG.
DWG. #
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
P6.064
Evaluation Board for ISL9111EH30Z
Evaluation Board for ISL9111EH33Z
Evaluation Board for ISL9111EH50Z
Evaluation Board for ISL9111EHADJZ
Evaluation Board for ISL9111AH30Z
Evaluation Board for ISL9111AH33Z
Evaluation Board for ISL9111AH50Z
Evaluation Board for ISL9111AEHADJZ
FN7602 Rev.4.00
Jun 4, 2012
Page 5 of 15
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