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PDF ISL91117 Data sheet ( Hoja de datos )
| Número de pieza | ISL91117 | |
| Descripción | High Efficiency Synchronous Boost Converter | |
| Fabricantes | Intersil | |
| Logotipo |  |
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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
MODE
FB
VOUT = 5V
C2
2x22µF
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION
100
95 VIN = 4.2V
90
85 VIN = 3.6V
80 VIN = 3.0V
75 VIN = 2.7V
70
65
60
55
50
0.1
1 10 100
LOAD CURRENT (mA)
1000
FIGURE 2. EFFICIENCY vs LOAD CURRENT (VOUT = 5V)
March 7, 2014
FN8569.3
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 2014. 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  
ISL91117
Analog Specifications VIN = PVIN = EN = 3.6V, VOUT = 5V, L1 = 1µH, C1 = 22µF, C2 = 2 x 22µF, TA = +25°C. Boldface limits apply over
the operating temperature range, -40°C to +85°C and input voltage range (1.8V to 4.8V). (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 8) TYP (Note 8) UNITS
SOFT-START and SOFT DISCHARGE
tSS Soft-start Time
Time from when EN signal asserts to when output voltage
ramp starts.
1
ms
RDISCHG VOUT Soft-Discharge ON-Resistance
POWER MOSFET
Time from when output voltage ramp starts to when
output voltage reaches 95% of its nominal value.
VIN = 2V, IOUT = 200mA
EN < VIL
2 ms
120 Ω
RDSON_P P-Channel MOSFET ON-Resistance
RDSON_N N-Channel MOSFET ON-Resistance
IPK_LMT P-Channel MOSFET Peak Current Limit
PFM/PWM TRANSITION
IOUT = 200mA
IOUT = 200mA
90 mΩ
75 mΩ
3.7 4.2 4.7
A
Load Current Threshold, PFM to PWM
200 mA
Load Current Threshold, PWM to PFM
75 mA
External Synchronization Frequency Range
2.75
3.25 MHz
Thermal Shutdown
150 °C
Thermal Shutdown Hysteresis
35 °C
LOGIC INPUTS
ILEAK Input Leakage
0.03 0.5
µA
VIH Input HIGH Voltage
1.4 V
VIL Input LOW Voltage
0.4 V
NOTES:
8. 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.
9. Quiescent current measurements are taken when the output is not switching.
Submit Document Feedback
5
FN8569.3
March 7, 2014
5 Page 
ISL91117
Recommended PCB Layout
Correct PCB layout is critical for proper operation of the
ISL91117. The input and output capacitors should be positioned
as closely to the IC as possible. The ground connections of the
input and output capacitors should be kept as short as possible,
and should be on the component layer to avoid problems that are
caused by high switching currents flowing through PCB vias.
FIGURE 21. RECOMMENDED LAYOUT
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
March 7, 2014
FN8569.3
Updated Related Literature.
Figure 18 on page 8 Title changed from START-UP WITH NO LOAD (VIN = 3.6V, VOUT = 5V) to START-UP WITH
25Ω (VIN = 3.6V, VOUT = 5V).
February 4, 2014
FN8569.2 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
Submit Document Feedback 11
FN8569.3
March 7, 2014
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ISL91117.PDF ] | |
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