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PDF ISL8012 Data sheet ( Hoja de datos )
| Número de pieza | ISL8012 | |
| Descripción | 2A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator | |
| Fabricantes | Intersil Corporation | |
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2A Low Quiescent Current 1MHz High Efficiency
Synchronous Buck Regulator
ISL8012
The ISL8012 is a high efficiency, monolithic, synchronous
step-down DC/DC converter that can deliver up to 2A continuous
output current from a 2.7V to 5.5V input supply. It uses a current
control architecture to deliver very low duty cycle operation at
high frequency with fast transient response and excellent loop
stability.
The ISL8012 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 240mV dropout voltage at 2A output
current. High 1MHz pulse width modulation (PWM) switching
frequency allows the use of small external components.
The ISL8012 can be configured for discontinuous or forced
continuous operation at light load. Forced continuous operation
reduces noise and RF interference while discontinuous mode
provides high efficiency by reducing switching losses at light
loads.
Fault protection is provided by internal current limiting during
short circuit and overcurrent conditions, an output overvoltage
comparator and over-temperature monitor circuit. A power-good
output voltage monitor indicates when the output is in regulation.
The ISL8012 offers a 1ms Power-good (PG) timer at power-up.
When shutdown, ISL8012 discharges the output capacitor. Other
features include internal soft-start, internal compensation,
overcurrent protection, and thermal shutdown.
The ISL8012 is offered in a space saving 3mmx3mm 10 Ld DFN
package lead free package with exposed pad lead frames for low
thermal. The complete converter occupies less than 0.35in2
area.
Features
• High Efficiency Synchronous Buck Regulator with up to 95%
Efficiency
• Power-Good (PG) Output with a 1ms Delay
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 2A Guaranteed Output Current
• Start-up with Pre-Biased Output
• Internal Soft-Start - 1ms
• Soft-Stop Output Discharge During Disabled
• 40µA Quiescent Supply Current in PFM Mode
• Selectable Forced PWM Mode and PFM Mode
• Less than 1µA Logic Controlled Shutdown Current
• 100% Maximum Duty Cycle
• Internal Current Mode Compensation
• Peak Current Limiting and Hiccup Mode Short Circuit
Protection
• Over-Temperature Protection
• Small 10 Ld 3mmx3mm 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
• Li-ion Battery Powered Devices
• Small Form Factor (SFP) Modules
• Bar Code Readers
Related Literature
• See AN1360 for “ISL8012EVAL1Z: 2A Synchronous Buck
Regulator with Integrated MOSFETs”
FN6616.2
December 1, 2011
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 Inc. 2008, 2010, 2011. 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  
ISL8012
Absolute Maximum Ratings (Reference to GND)
VIN, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
EN, RSI, PG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN+0.3V
LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.5V (100ns)/-0.3V (DC) to 6.5V
VFB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 2A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300V
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
10 Ld 3x3 DFN (Notes 4, 5). . . . . . . . . . .
49
5.5
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating conditions and
the typical specifications are measured at the following conditions: TA = -40°C to +85°C, VIN = 3.6V, EN = VCC, unless otherwise noted. Typical values are
at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7) UNITS
INPUT SUPPLY
VIN Undervoltage Lockout Threshold
VUVLO
Rising
Falling
2.5 2.7
2.2 2.4
V
V
Quiescent Supply Current
IVIN MODE = VIN, no load at the output
MODE = VIN, no load at the output and no switches
switching; design info only
40 60
15
µA
µA
MODE = SGND, no load at the output
6 8 mA
Shut Down Supply Current
OUTPUT REGULATION
ISD VIN = 5.5V, EN = low
0.1 2
µA
VFB Regulation Voltage
VFB Bias Current
Output Voltage Accuracy
Line Regulation
COMPENSATION
VVFB
IVFB
TA = 0°C to +85°C
VFB = 0.75V
0.784 0.8 0.816
0.1
V
µA
VIN = VO + 0.5V to 5.5V, IO = 0A to 2A (Note 6)
-3
3%
VIN = VO + 0.5V to 5.5V (minimal 2.7V), IOUT = 400mA
0.2
%/V
Error Amplifier Trans-Conductance
Adjustable version, design info only
20 µA/V
LX
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
P-Channel MOSFET Peak Current Limit
LX Maximum Duty Cycle
VIN = 5.5V, IO = 200mA
VIN = 2.7V, IO = 200mA
VIN = 5.5V, IO = 200mA
VIN = 2.7V, IO = 200mA
IPK
2.65
0.12
0.21
0.11
0.13
3.00
100
0.22
0.27
0.22
0.27
3.50
A
PWM Switching Frequency
fS TA = 0°C to +85°C
0.840 1 1.16 MHz
5 December 1, 2011
FN6616.2
5 Page 
ISL8012
Typical Operating Performance (Unless otherwise noted, operating conditions are: TA = +25°C, VVIN = 2.5V to 5.5V,
EN = VIN, MODE = 0V, L = 2.2µH, C1 = 2x10µF, C2 = 2x10µF, IOUT = 0A to 2A). (Continued)
RSI 2V/DIV
VOUT RIPPLE
20mV/DIV
PG 2V/DIV
FIGURE 27. RSI RESET, (200µs/DIV)
RSI 2V/DIV
PG 2V/DIV
VOUT RIPPLE
20mV/DIV
FIGURE 28. RSI RESET (ZOOM OUT), (200µs/DIV)
PHASE 2V/DIV
VOUT
0.5V/DIV
IL 2A/DIV
PG 5V/DIV
FIGURE 29. OUTPUT SHORT CIRCUIT, (500µs/DIV)
LX 2V/DIV
IL 2A/DIV
VOUT
1V/DIV
PG 5V/DIV
FIGURE 30. OUTPUT SHORT CIRCUIT RECOVERY, (500µs/DIV)
3.2
3.1 5.5VIN
3.0
2.9
2.8
2.7 3.3VIN
2.6
2.5
2.4-50
-25
0
25 50 75 100
TEMPERATURE (°C)
FIGURE 31. OUTPUT CURRENT LIMIT vs TEMPERATURE
11 December 1, 2011
FN6616.2
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ISL8012.PDF ] | |
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