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PDF ISL91127IR Data sheet ( Hoja de datos )
| Número de pieza | ISL91127IR | |
| Descripción | High Efficiency Buck-Boost Regulator | |
| Fabricantes | Intersil | |
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DATASHEET
High Efficiency Buck-Boost Regulator with 4.5A
Switches
ISL91127IR
The ISL91127IR is a high-current buck-boost switching regulator
for systems using new battery chemistries. It uses Intersil’s
proprietary buck-boost algorithm to maintain voltage regulation
while providing excellent efficiency and very low output voltage
ripple when the input voltage is close to the output voltage.
The ISL91127IR is capable of delivering at least 2A continuous
output current (VOUT = 3.3V) over a battery voltage range of 2.5V
to 4.35V. This maximizes the energy utilization of advanced
single-cell Li-ion battery chemistries that have significant
capacity left at voltages below the system voltage. Its fully
synchronous low ON-resistance, 4-switch architecture and a low
quiescent current of only 30µA optimize efficiency under all load
conditions.
The ISL91127IR supports stand-alone applications with a fixed
3.3V or 3.5V output voltage or adjustable output voltage with an
external resistor divider. Output voltages as low as 1.0V or as
high as 5.2V are supported.
The ISL91127IR is available in a 20 Ld, 0.5mm pitch QFN
(4mmx4mm) package. The 2.5MHz switching frequency further
reduces the size of external components.
Related Literature
• UG080, “ISL91127IRN-EVZ, ISL91127IR2A-EVZ,
ISL91127IRA-EVZ Evaluation Boards User Guide”
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 2A (PVIN = 2.5V, VOUT = 3.3V)
• High efficiency: up to 96%
• 30µA quiescent current maximizes light-load efficiency
• 2.5MHz switching frequency minimizes external component
size
• Fully protected for short-circuit, over-temperature and
undervoltage
• 20 Ld 4mmx4mm QFN package
Applications
• Handheld and battery powered consumer and medical devices
• Brownout free system voltage for smartphones and tablet PCs
• Wireless communication devices
• 2G/3G/4G RF power amplifiers
VIN = 1.8V TO 5.5V
C1
10µF
ISL91127IRNZ
PVIN
LX1
VIN
EN
MODE
LX2
VOUT
FB
SGND PGND
L1
1µH
VOUT = 3.3V
C2
2x22µF
FIGURE 1. TYPICAL APPLICATION: VOUT = 3.3V
100
95
90
85
VIN = 2.5V
80 VIN = 3.3V
75 VIN = 3.6V
70
1
VIN = 4V
10
100 1000
LOAD CURRENT (mA)
FIGURE 2. EFFICIENCY: VOUT = 3.3V, TA = +25°C
August 3, 2016
FN8859.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL91127IR
Analog Specifications VIN = VPVIN = VEN = 3.6V, VOUT = 3.3V, L1 = 1µH, C1 = 10µF, C2 = 2x22µF, TA = +25°C. Boldface limits apply across
the operating temperature range, -40°C to +85°C and input voltage range (1.8V to 5.5V) unless specified otherwise. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX
(Note 6) (Note 7) (Note 6) UNIT
DC/DC SWITCHING SPECIFICATIONS
fSW Oscillator Frequency
tONMIN Minimum On-Time
IPFETLEAK LX1 Pin Leakage Current
INFETLEAK LX2 Pin Leakage Current
SOFT-START AND SOFT DISCHARGE
VIN = 3.6V
VIN = 3.6V
2.1 2.5 2.9 MHz
80 ns
-1 1 µA
-1 1 µA
tSS Soft-Start Time
Time from when EN signal asserts to when output
voltage ramp starts.
1 ms
Time from when output voltage ramp starts to when
1 ms
output voltage reaches 95% of its nominal value with
device operating in buck mode.
VIN = 4V, VOUT = 3.3V, IO = 200mA
Time from when output voltage ramp starts to when
2 ms
output voltage reaches 95% of its nominal value with
device operating in boost mode.
VIN = 2V, VOUT = 3.3V, IO = 200mA
rDISCHG VOUT Soft-Discharge ON-Resistance
EN < VIL
120 Ω
POWER MOSFET
rDSON_P P-Channel MOSFET ON-Resistance
VIN = 3.6V, IO = 200mA
rDSON_N N-Channel MOSFET ON-Resistance
VIN = 3.6V, IO = 200mA
IPK_LMT P-Channel MOSFET Peak Current Limit VIN = 3.6V
PFM/PWM TRANSITION
32 mΩ
37 mΩ
3.7 4.5
5
A
Load Current Threshold, PFM to PWM
Load Current Threshold, PWM to PFM
Thermal Shutdown
VIN = 3.6V, VOUT = 3.3V
VIN = 3.6V, VOUT = 3.3V
200 mA
75 mA
155 °C
Thermal Shutdown Hysteresis
30 °C
LOGIC INPUTS
ILEAK Input Leakage
VIN = 3.6V
0.05
1
µA
VIH Input HIGH Voltage
VIN = 3.6V
1.4 V
VIL Input LOW Voltage
VIN = 3.6V
0.4 V
NOTES:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
7. Typical values are for TA = +25°C and VIN = 3.6V.
8. Quiescent current measurements are taken when the output is not switching.
Submit Document Feedback
5
FN8859.1
August 3, 2016
5 Page 
ISL91127IR
Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please go to web to make sure you have the latest revision.
DATE
REVISION
CHANGE
August 3, 2016
FN8859.1
Page 1, Features - removed Burst current bullet
Page 1, Applications - added “Handheld and battery powered consumer and medical devices” bullet
Page 4, Recommended Operating Conditions - removed: VIN = 3.0V VOUT = 3.3V, tON = 600µs, t = 4.6ms. . . .3A
Page 8, Typical Performance Curves - added Figure 18, Output Current Capability chart.
June 23, 2016
FN8859.0 Initial Release
About Intersil
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
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