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PDF ISL91108 Data sheet ( Hoja de datos )
| Número de pieza | ISL91108 | |
| Descripción | High Efficiency Buck-Boost Regulator | |
| Fabricantes | Intersil | |
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DATASHEET
High Efficiency Buck-Boost Regulator with 4.2A Switches
ISL91108
The ISL91108 is a highly-integrated buck-boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. Unlike other buck-boost regulators,
this regulator automatically transitions between operating
modes without significant output disturbance.
This device is capable of delivering up to 2.7A of burst current
(PVIN = 3V, VOUT = 3.3V), and provides excellent efficiency due
to its fully synchronous 4-switch architecture. No load
quiescent current of only 27.5µA also optimizes efficiency
under light-load conditions. Forced PWM and/or
synchronization to an external clock may also be selected for
noise sensitive applications.
The ISL91108 is designed for standalone applications and
supports a 3.3V fixed output voltage or variable output
voltages with an external resistor divider. Output voltages as
low as 1V or as high as 5.2V are supported using an external
resistor divider.
The ISL91108 requires only a single inductor and very few
external components. Power supply solution size is minimized
by a 2.34mmx1.72mm WLCSP and a 2.6MHz switching
frequency, which further reduces the size of external
components.
Related Literature
• AN1903 “ISL91108IIA-EVZ/ISL91108IIN-EVZ Evaluation
Board 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 1.6A DC (PVIN = 2.8V, VOUT = 3.3V)
• Burst current: up to 2.7A (PVIN = 3V, VOUT = 3.3V, tON
<600µs, t = 4.6ms)
• High efficiency: up to 95%
• 27.5µA quiescent current maximizes light load efficiency
• 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
• Smartphones and tablets
• Wireless communication devices
• 2G/3G/4G power amplifiers
VIN =
1.8V TO 5.5V
C1
2x10µF
ISL91108IINZ
PVIN
LX1
VIN
MODE
EN
LX2
VOUT
FB
L1
1µH
VOUT = 3.3V
C2
2x22µF
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION
100
4.5VIN
95
90
85 3.5VIN
80 3.0VIN
75
2.7VIN
70
2.5VIN
65
60
55
50
0.001
0.01
0.1
1
IOUT (A)
FIGURE 2. ISL91108IINZ EFFICIENCY vs OUTPUT CURRENT
November 12, 2014
FN8448.1
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 2013, 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  
ISL91108
Analog Specifications VIN = PVIN = EN = 3.6V, VOUT = 3.3V, L1 = 1µH, C1 = 2x 10µF, C2 = 2x 22µF, TA = +25°C. Boldface limits apply
across the recommended operating temperature range, -40°C to +85°C and input voltage ranges. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX
(Note 7)
(Note 7) UNITS
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
2.4 2.6 2.9 MHz
80 ns
-0.5
+0.5
µA
-0.5
+0.5
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
1 ms
when output voltage reaches 95% of its nominal
value with device operating in buck mode.
VIN = 4V, IOUT = 200mA
Time from when output voltage ramp starts to
2 ms
when output voltage reaches 95% of its nominal
value with device operating in boost mode.
VIN = 2V, IOUT = 200mA
RDISCHG VOUT Soft-Discharge ON-Resistance
EN < VIL
110 Ω
POWER MOSFET
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%
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:
7. 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.
8. Quiescent current measurements are taken when the output is not switching.
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5
FN8448.1
November 12, 2014
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ISL91108.PDF ] | |
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