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PDF L9106 Data sheet ( Hoja de datos )
| Número de pieza | L9106 | |
| Descripción | ISL9106 | |
| Fabricantes | Intersil Corporation | |
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Hay una vista previa y un enlace de descarga de L9106 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Data Sheet
June 29, 2007
ISL9106
FN6509.0
1.2A 1.6MHz Low Quiescent Current High
Efficiency Synchronous Buck Regulator
ISL9106 is a 1.2A, 1.6MHz step-down regulator, which is
ideal for powering low-voltage microprocessors in compact
devices such as PDAs and cellular phones. It is optimized
for generating low output voltages down to 0.8V. The supply
voltage range is from 2.7V to 5.5V allowing the use of a
single Li+ cell, three NiMH cells or a regulated 5V input.
1.6MHz pulse-width modulation (PWM) switching frequency
www.DataSheaellto4wU.scoumsing small external components. It has flexible
operation mode selection of forced PWM mode and Skip
(Low IQ) mode with typical 17μA quiescent current for
highest light load efficiency to maximize battery life.
The ISL9106 integrates a pair of low ON-resistance
P-Channel and N-Channel MOSFETs to maximize efficiency
and minimize external component count.
The ISL9106 offers a typical 215ms Power-Good (PG) timer
when powered up. The timer output can be reset by RSI.
When shutdown, ISL9106 discharges the output capacitor.
Other features include internal digital soft-start, enable for
power sequence, overcurrent protection, and thermal
shutdown.
The ISL9106 is offered in 10 Ld 3mmx3mm DFN package
with 0.9mm typical height. The complete converter can
occupy less than 1cm2 area.
Ordering Information
PART
NUMBER
(Note)
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL9106IRZ 106Z
-40 to +85 10 Ld 3x3 DFN L10.3x3C
ISL9106IRZ-T 106Z
-40 to +85 10 Ld 3x3 DFN L10.3x3C
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Features
• High Efficiency Integrated Synchronous Buck Regulator
with up to 95% Efficiency
• 2.7V to 5.5V Supply Voltage
• 17μA Quiescent Supply Current in Skip (Low IQ) Mode
• 1.2A Guaranteed Output Current
• 3% Output Accuracy Over Temperature/Load/Line
• Selectable Forced PWM Mode and Skip Mode
• Less than 1μA Logic Controlled Shutdown Current
• 100% Maximum Duty Cycle for Lowest Dropout
• Discharge Output Cap when Shutdown
• Internal Digital Soft-Start
• Peak Current Limiting, Short Circuit Protection
• Over-Temperature Protection
• Enable, Power Good Function
• 10 Ld 3mmx3mm DFN
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
www.DataSheet.co.kr
• Single Li-Ion Battery-Powered Equipment
• DSP Core Power
• PDAs and Palmtops
Pinout
ISL9106
(10 LD 3X3 DFN)
TOP VIEW
VIN 1
NC 2
EN 3
PG 4
MODE 5
10 SW
9 PGND
8 SGND
7 FB
6 RSI
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
ISL9106
Typical Operating Performance (Continued)
1.550
2.50000
1.525
1.500
TA = +25°C
TA = +85°C
2.49375
2.48750
TA = +85°C
1.475
1.450
2.7
TA = -40°C
3.4
4.1
4.8
INPUT VOLTAGE (V)
www.DataSheet4U.com
FIGURE 7. VOUT vs VIN (MODE = VIN, VOUT = 1.5V,
IOUT = 600mA)
5.5
2.48125
TA = +25°C
2.47500
2.7
TA = -40°C
3.4 4.1 4.8
INPUT VOLTAGE (V)
FIGURE 8. VOUT vs VIN (MODE = VIN, VOUT = 2.5V,
IOUT = 600mA)
5.5
2V/DIV
VSW
1V/DIV
VOUT
200mA/DIV
5V/DIV
IL
EN
200μs/DIV
FIGURE 9. SOFT-START TO PWM MODE (VIN = 4.2V,
VOUT = 1.6V, IOUT = 500mA)
2V/DIV
VSW
1V/DIV
VOUT
www.DataSheet.co.kr
200mA/DIV
5V/DIV
IL
EN
200μs/DIV
FIGURE 10. SOFT-START TO SKIP MODE (VIN = 4.2V,
VOUT = 1.6V, IOUT = 0.01mA)
2V/DIV
VSW
20mV/DIV
200mA/DIV
VOUT (AC COUPLED)
IL
1μs/DIV
FIGURE 11. STEADY-STATE IN SKIP MODE (VIN = 5.0V,
VOUT = 1.8V, IOUT = 35mA)
5
2V/DIV
20mV/DIV
VSW
1A/DIV
VOUT (AC COUPLED)
IL
1μs/DIV
FIGURE 12. STEADY-STATE IN PWM MODE (VIN = 5.0V,
VOUT = 1.8V, IOUT = 1.2A)
FN6509.0
June 29, 2007
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
ISL9106
Mode Selection
The MODE pin is provided on ISL9106 to select the
operation mode. When it is driven to logic low or ground, the
regulator operates in forced PWM mode. Under forced PWM
mode, the device remains at the fixed PWM operation
(typical at 1.6MHz), regardless of if the load current is high
or low.
When the MODE pin is driven to logic high or connected to
input voltage VIN, the regulator operates in either SKIP
mode or fixed PWM mode depending on the different load
conditions.
RSI Signal
www.DataSheTeht4eUR.cSoImsignal is an input signal, which can reset the PG
signal. As shown in Figure 24, the power-good signal is
gated by the RSI signal. When the RSI is high, the PG signal
remains low, regardless of the output voltage condition.
Overcurrent Protection
The overcurrent protection is provided on ISL9106 when
over load condition happens. It is realized by monitoring the
CSA output with the OCP comparator, as shown in Figure 24.
When the current at P-Channel MOSFET is sensed to reach
the current limit, the OCP comparator is trigged to turn off
the P-Channel MOSFET immediately.
Short-Circuit Protection
ISL9106 has a Short-Circuit Protection (SCP) comparator,
which monitors the FB pin voltage for output short-circuit
protection. When the FB voltage is lower than 0.2V, the SCP
comparator forces the PWM oscillator frequency to drop to
1/3 of its normal operation frequency.
Undervoltage Lockout (UVLO)
When the input voltage is below the Undervoltage Lock Out
(UVLO) threshold, ISL9106 is disabled.
Soft-Start-Up
The soft-start-up eliminates the inrush current during the
circuit start-up. The soft-start block outputs a ramp reference
to both the voltage loop and the current loop. The two ramps
limit the inductor current rising speed as well as the output
voltage speed so that the output voltage rises in a controlled
fashion. At the very beginning of the start-up, the output
voltage is less than 0.2V; hence the PWM operating
frequency is 1/3 of the normal frequency.
Power MOSFETs
The power MOSFETs are optimized to achieve better
efficiency. The ON-resistance for the P-Channel MOSFET is
typically160mΩ and the typical ON-resistance for the
N-Channel MOSFET is 150mΩ.
Low Dropout Operation
The ISL9106 features low dropout operation to maximize the
battery life. When the input voltage drops to a level that
ISL9106 can no longer operate under switching regulation to
maintain the output voltage, the P-Channel MOSFET is
completely turned on (100% duty cycle). The dropout
voltage under such condition is the product of the load
current and the ON-resistance of the P-Channel MOSFET.
Minimum required input voltage VIN under this condition is
the sum of output voltage plus the voltage drop cross the
inductor and the P-Channel MOSFET switch.
Thermal Shut Down
The ISL9106 provides built-in thermal protection function.
The thermal shutdown threshold temperature is typical
+150°C with typical +25°C hysteresis. When the internal
temperature is sensed to reach +150°C, the regulator is
completely shut down and as the temperature is sensed to
drop to +125°C (typical), the ISL9106 resumes operation
starting from the soft-start-up.
Applications Information
Inductor and Output Capacitor Selection
To achieve better steady state and transient response,
ISL9106 typically uses a 2.2µH inductor. The peak-to-peak
inductor current ripple can be expressed as follows:
VO
•
⎛
⎜1
⎝
–
V-V----I-O-N--⎠⎟⎞
ΔI
=
--------------------------------------
L • fS
(EQ. 1)
In Equation 1, usually the typical values can be used but to
have a more conservative estimation, the inductance should
considerwww.DataSheet.co.kr the value with worst case tolerance; and for
switching frequency fS, the minimum fS from the “Eletrical
Specifications” table on page 2 can be used.
To select the inductor, its saturation current rating should be
at least higher than the sum of the maximum output current
and half of the delta calculated from Equation 1. Another
more conservative approach is to select the inductor with the
current rating higher than the P-Channel MOSFET peak
current limit.
Another consideration is the inductor DC resistance since it
directly affects the efficiency of the converter. Ideally, the
inductor with the lower DC resistance should be considered
to achieve higher efficiency.
Inductor specifications could be different from different
manufacuturers so please check with each manufacturer if
additional information is needed.
For the output capacitor, a ceramic capacitor can be used
because of the low ESR values, which helps to minimize the
output voltage ripple. A typical value of 10µF/6.3V ceramic
capacitor should be enough for most of the applications and
the capacitor should be X5R or X7R.
11
FN6509.0
June 29, 2007
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet L9106.PDF ] | |
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