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PDF ISL8009A Data sheet ( Hoja de datos )
| Número de pieza | ISL8009A | |
| Descripción | 1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
February 13, 2008
ISL8009A
FN6656.0
1.5A Low Quiescent Current 1.6MHz High
Efficiency Synchronous Buck Regulator
The ISL8009A is a high efficiency, monolithic, synchronous
step-down DC/DC regulator that can deliver up to 1.5A
continuous output current. It is optimized for generating low
output voltages down to 0.8V. The supply voltage range of
2.7V to 5.5V, allows the use of single Li+cell, three NiMH
cells or a regulated 5V input. The ISL8009A uses current
mode control architecture to deliver very low duty cycle
operation at high frequency with fast transient response and
excellent loop stability. It has flexible operation mode
selection of forced PWM mode and automatic PFM/PWM
with as low as 17µA quiescent current, achieving high power
conversion efficiency under light load condition, hence
maximizing battery life. High 1.6MHz pulse-width modulation
(PWM) switching frequency allows the use of small external
components.
The ISL8009A integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The
100% duty-cycle operation allows less than 400mV dropout
voltage at 1.5A output current.
The ISL8009A offers a 2ms Power-On-Reset (POR) timer at
power-up. The timer output can be reset by RSI. When
shutdown, ISL8009A discharges the output capacitor
through a 100Ω resistor. Other features include internal
digital soft-start, enable for power sequence, overcurrent
protection, and thermal shutdown.
The ISL8009A is offered in a 2mmx3mm 8 Ld DFN package
with 1mm maximum height. The complete converter
occupies less than 1cm2 area.
Ordering Information
TEMP.
PART NUMBER PART RANGE
(Note)
MARKING (°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL8009AIRZ-T* 09A
-40 to +85 8 Ld 2x3 DFN L8.2x3
*Please refer to TB347 for details on reel specifications.
NOTE: 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.
Features
• High Efficiency Synchronous Buck Regulator with up to
95% Efficiency
• 2ms Reset Timer
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 1.5A Guaranteed Output Current
• 17µA Quiescent Supply Current in PFM Mode
• Selectable Forced PWM Mode and PFM Mode
• Less Than 1µA Logic Controlled Shutdown Current
• 90% Maximum Duty Cycle for Lowest Dropout at 1.5A
• Internal Current Mode Compensation
• Internal Digital Soft-Start
• Peak Current Limiting, Short Circuit Protection
• Over-Temperature Protection
• Enable
• Soft Discharge Disable
• Small 8 Ld 2mmx3mm DFN
• Pb-Free (RoHS Compliant)
Applications
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
• Portable Instruments
• Test and Measurement Systems
Pinout
ISL8009A
(8 LD DFN)
TOP VIEW
VIN 1
EN 2
POR 3
SKIP 4
8 LX
7 GND
6 VFB
5 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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8009A
www.TDaytapSihceaetl4UO.cpomerating Performance (Unless otherwise noted, operating conditions are: TA = +25°C, VVIN = 5V, EN = VIN,
RSI = SKIP = 0V, L = 2.2µH, C1 = 20µF, C2 = 20µF, IOUT = 0A) (Continued)
1.84
1.83
1.82
5.5VIN - PWM
1.81 2.7VIN - PWM
5.5VIN - PFM
1.80
1.79
4VIN-PFM
1.78
1.77
4VIN - PWM
2.7VIN - PFM
1.76
0.00
0.25
0.50
0.75
1.00
OUTPUT LOAD (A)
1.25
1.50
FIGURE 7. VOUT REGULATION vs LOAD, VOUT = 1.8V
2.54
2.53
2.52
5VIN - PWM
5VIN - PFM
2.51
2.50
2.49
2.48
2.47
3.3VIN - PFM
3.3VIN - PWM
2.46
0.00
0.25
0.50
0.75
1.00
OUTPUT LOAD (A)
1.25
1.50
FIGURE 8. VOUT REGULATION vs LOAD, VOUT = 2.5V
3.42
3.40
3.38
4VIN - PWM
5.5VIN - PWM
5.5VIN - PFM
3.36
3.34
3.32
3.30
4VIN - PFM
3.3VIN - PWM
5VIN-PFM
3.28
3.26
0.00
0.25
0.50
0.75
1.00
OUTPUT LOAD (A)
1.25
1.50
FIGURE 9. VOUT REGULATION VS LOAD, VOUT = 3.3V
45
40
35 NO LOAD- PWM
30
25
20
15 NO LOAD - PFM
10
5
0
2.75
3.25
3.75
4.25
4.75
5.25
VIN (V)
FIGURE 11. POWER DISSIPATION vs VIN AT NO LOAD,
VOUT = 1.8V
0.7
2.8VIN - PWM
0.6
0.5
0.4
0.3
0.2 3.3VIN - PWM
0.1 5VIN - PWM
2.8VIN - PFM
3.3VIN-PFM
5VIN - PFM
0.0
0.00
0.25
0.50
0.75
1.00
1.25
OUTPUT LOAD (A)
1.50
FIGURE 10. POWER DISSIPATION vs LOAD, 1.6 MHz,
VOUT = 1.8V
2.5
0.75A LOAD
2.0
1.5
1.5A LOAD
1.0
NO LOAD
0.5
0.0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
FIGURE 12. OUTPUT VOLTAGE REGULATION vs VIN PWM
MODE
5 FN6656.0
February 13, 2008
5 Page 
ISL8009A
www.ADaptapShlieceta4Uti.oconms Information
Output Inductor and Capacitor Selection
To consider steady state and transient operation, ISL8009A
typically uses a 3.3µH output inductor. Higher or lower
inductor values can be used to optimize the total converter
system performance. For example, for higher output voltage
3.3V application, in order to decrease the inductor current
ripple and output voltage ripple, the output inductor value
can be increased. The inductor ripple current can be
expressed in Equation 1:
VO
•
⎛
⎜1
⎝
–
V-V----I-O-N--⎠⎟⎞
ΔI = -------------L-----•----f--S--------------
(EQ. 1)
The inductor’s saturation current rating needs be at least
larger than the peak current. The ISL8009A protects the
typical peak current 2.1A. The saturation current needs to be
over 2.4A for maximum output current application.
ISL8009A uses internal compensation network and the
output capacitor value is dependant on the output voltage.
The ceramic capacitor is recommended to be X5R or X7R.
The recommended minimum output capacitor values are
shown in Table 1.
TABLE 1. OUTPUT CAPACITOR VALUE vs VOUT
VOUT (V)
0.8
COUT (µF)
10
L (µH)
1.0~2.2
1.2 10 1.2~2.2
1.6 10 1.8~2.2
1.8 10 1.8~3.3
2.5 10 1.8~3.3
3.3 10 1.8~4.7
3.6 10 1.8~4.7
Output Voltage Setting Resistor Selection
The resistors R2 and R3 shown in Figure 24 set the output
voltage for the adjustable version. The output voltage can be
calculated by Equation 2:
VO
=
0.8
•
⎛
⎜
⎝
1
+
RR-----23- ⎠⎟⎞
(EQ. 2)
where the 0.8V is the reference voltage.
The voltage divider consists of R2 and R3 and increases the
quiescent current by VO/(R2 + R3), so larger resistance is
desirable. On the other hand, the VFB pin has leakage
current that will cause error in the output voltage setting. The
leakage current has a typical value of 0.1µA. To minimize the
accuracy impact on the output voltage, select the R3 no
larger than 200kΩ. For VO = 0.8V, it is recommended to
short R2 and open R3.
Layout Recommendation
The layout is a very important converter design step to make
sure the designed converter works well. For the ISL8009A
buck converter, the power loop is composed of the output
inductor L, the output capacitor COUT, the LX pin and the
GND pin. It is necessary to make the power loop as small as
possible.
The heat of the IC is mainly dissipated through the thermal
pad. Maximizing the copper area connected to the thermal
pad is preferable. In addition, a solid ground plane is helpful
for EMI performance. It is recommended to add 5 vias under
the thermal pad connection to the solid ground plane.
In Table 1, the minimum output capacitor value is given for
different output voltages to make sure the whole converter
system is stable.
Input Capacitor Selection
The main functions for the input capacitor are to provide
decoupling of the parasitic inductance and to provide filtering
function to prevent the switching current from flowing back to
the battery rail. A 10µF, X5R or X7R ceramic capacitor is a
good starting point for the input capacitor selection.
11 FN6656.0
February 13, 2008
11 Page | ||
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| PDF Descargar | [ Datasheet ISL8009A.PDF ] | |
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