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ISL8012 の電気的特性と機能

ISL8012のメーカーはIntersil Corporationです、この部品の機能は「2A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL8012
部品説明 2A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL8012 Datasheet, ISL8012 PDF,ピン配置, 機能
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 pdf, ピン配列
Typical Application
INPUT 2.7V TO 5.5V
C1
2x10µF
R1
100k
ISL8012
VIN LX
PGND
ISL8012
EN SGND
PG VFB
OUTPUT
L 1.8V/2A
C2
2x10µF
R2
124k
C3*
220pF
R3
100k
MODE
RSI
Block Diagram
FIGURE 1. TYPICAL APPLICATION DIAGRAM
EN
VFB
PG
RSI
SOFT-START
SHUTDOWN
BANDGAP 0.8V
EAMP
27pF
390k
OSCILLATOR
+
COMP
+
MODE
SHUTDOWN
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
DRIVER
0.864V
+
0.736V
+
SLOPE
COMP
1ms
DELAY
+
OCP
+
CSA
1V
+
SKIP
0.25V
ZERO-CROSS
SENSING
SCP
0.2V +
FIGURE 2. FUNCTIONAL BLOCK DIAGRAM
3
*C3 is optional
VIN
LX
GND
December 1, 2011
FN6616.2


3Pages


ISL8012 電子部品, 半導体
ISL8012
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. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7) UNITS
LX Minimum On-Time
MODE = low (forced PWM mode)
80 100 ns
Soft-Start-Up Time
PG
VIN = 3.6V
1.1 ms
Output Low Voltage
Sinking 1mA, VFB = 0.7V
0.3 V
Delay Time
1 ms
PG Pin Leakage Current
Minimum Supply Voltage for Valid PG Signal
PG = VIN = 3.6V
0.01 0.1
1.2
µA
V
Internal PGOOD Low Rising Threshold
Percentage of nominal regulation voltage
89 92 95
%
Internal PGOOD Low Falling Threshold
Percentage of nominal regulation voltage
85 88 91
%
Internal PGOOD High Rising Threshold
Percentage of nominal regulation voltage
107 110 113
%
Internal PGOOD High Falling Threshold
Percentage of nominal regulation voltage
104 107 110
%
Internal PGOOD Delay Time
30 µs
EN, MODE, RSI
Logic Input Low
0.4 V
Logic Input High
1.4 V
Logic Input Leakage Current
Pulled up to 5.5V
0.1 1
µA
NOTES:
6. Limits established by characterization and are not production tested.
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.
6 December 1, 2011
FN6616.2

6 Page



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