(PDF) ISL8033 Datasheet PDF | Intersil





ISL8033 Datasheet PDF

Part Number ISL8033
Description Dual 3A Low Quiescent Current High Efficiency Synchronous Buck Regulator
Manufacture Intersil
Total Page 18 Pages
PDF Download Download ISL8033 Datasheet PDF

Features: Datasheet pdf Dual 3A Low Quiescent Current High Effic iency Synchronous Buck Regulator ISL803 3, ISL8033A ISL8033 is a dual integrate d power controller rated for 3A per cha nnel with a 1MHz step-down regulator th at is ideal for any low power low-volta ge applications. The ISL8033A offers 2. 5MHz operation for smaller more compact ed design. The channels are 180° out-o f-phase for input RMS current and EMI r eduction. It is optimized for generatin g low output voltages down to 0.8V each . The supply voltage range is from 2.85 V to 6V, allowing for the use of a sing le Li+ cell, three NiMH cells or a regu lated 5V input. It has a guaranteed min imum output current of 3A each when ISE T is connected to VDD. The output curre nt of each output is selectable by sett ing ISET pin. The ISL8033, ISL8033A inc ludes a pair of low ON-resistance P-Cha nnel and N-Channel internal MOSFETs to maximize efficiency and minimize extern al component count. 100% dutycycle oper ation allows less than 250mV dropout voltage at 3A. The ISL8033,.

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ISL8033 datasheet
Dual 3A Low Quiescent Current High Efficiency
Synchronous Buck Regulator
ISL8033, ISL8033A
ISL8033 is a dual integrated power controller rated for 3A per
channel with a 1MHz step-down regulator that is ideal for any low
power low-voltage applications. The ISL8033A offers 2.5MHz
operation for smaller more compacted design. The channels are
180° out-of-phase for input RMS current and EMI reduction. It is
optimized for generating low output voltages down to 0.8V each.
The supply voltage range is from 2.85V to 6V, allowing for the use
of a single Li+ cell, three NiMH cells or a regulated 5V input. It
has a guaranteed minimum output current of 3A each when ISET
is connected to VDD. The output current of each output is
selectable by setting ISET pin.
The ISL8033, ISL8033A includes a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. 100% duty-
cycle operation allows less than 250mV dropout voltage at 3A.
The ISL8033, ISL8033A offers an independent 1ms Power-Good
(PG) timer at power-up. When shutdown, ISL8033, ISL8033A
discharges the output capacitor. Other features include internal
digital soft-start, enable for power sequence, controllable soft-
stop output discharge during disabled, start-up with pre-biased
output, 100% maximum duty cycle for lowest dropout, 100%
duty cycle operation for smooth transition, less than 8µA logic
controlled shutdown current, independent enable, overcurrent
protection, and thermal shutdown.
The ISL8033, ISL8033A is offered in a 24 Ld 4mmx4mm QFN
package with 1mm maximum height. The complete converter
occupies less than 5.46cm2 area.
Features
• Dual 3A High Efficiency Synchronous Buck Regulator with up
to 95% Efficiency
• 2% Output Accuracy Over-Temperature/Load/Line
• Internal Digital Soft-Start - 1.5ms
• External Synchronization up to 6MHz (ISL8033)
• Internal Current Mode Compensation
• Peak Current Limiting and Hiccup Mode Short Circuit
Protection
• Adjustable Peak Overload Current
• Negative Current Protection
• Pb-Free (RoHS Compliant)
Applications
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
• Test and Measurement Systems
• Li-ion Battery Power Devices
• Bar Code Readers
Related Literature
• See AN1606, ISL8033EVAL1Z Application Note
• See AN1611, ISL8033EVAL2Z Application Note
100
90
80
70 3.3VOUT
60
50
400.0
VIN = 5V
0.5 1.0 1.5 2.0
IOUT (A)
FIGURE 1. EFFICIENCY vs LOAD
2.5
3.0
March 24, 2011
FN6854.2
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. 2010, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
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Free Datasheet http://www.datasheet4u.com/

ISL8033 datasheet
ISL8033, ISL8033A
Typical Application Circuit
INPUT 2.85V TO 6V
C1
2x22µF
VIN1, 2
LX1
VDD
ISET
EN1
ISL8033
PGND
FB1
L1
1.5µH
C2
2x22µF
R2
124k
PG1
SYNC
EN2
PG2
SGND
LX2
PGND
FB2
R3
100k
L2
1.5µH
C4
2x22µF
R5
124k
SGND
R6
100k
OUTPUT1
1.8V/3A
C3
12pF
OUTPUT2
1.8V/3A
C5
12pF
FIGURE 2. TYPICAL APPLICATION DIAGRAM - DUAL INDEPENDENT OUTPUTS
VOUT
C1
C2 (or C4)
C3 (or C5)
L1 (or L2)
R2 (or R5)
R3 (or R6)
0.8V
2x22µF
2x22µF
12pF
1.0µH~2.2µH
0
100k
TABLE 1. ISL8033 COMPONENT VALUE SELECTION
1.2V 1.5V 1.8V
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
12pF
12pF
12pF
1.0µH~2.2µH
1.0µH~2.2µH
1.0µH~3.3µH
50k
87.5k
124k
100k
100k
100k
2.5V
2x22µF
2x22µF
12pF
1.0µH~3.3µH
212.5k
100k
3.3V
2x22µF
2x22µF
12pF
1.0µH~4.7µH
312.5k
100k
TABLE 2. ISL8033A COMPONENT VALUE SELECTION
VOUT
C1
0.8V
2x22µF
1.2V
2x22µF
1.5V
2x22µF
1.8V
2x22µF
2.5V
2x22µF
3.3V
2x22µF
C2 (or C4)
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
C3 (or C5)
12pF
12pF
12pF
12pF
12pF
12pF
L1 (or L2)
0.47~1.5µH
0.47~1.5µH
0.47~1.5µH
0.47~1.5µH
1.0~2.2µH
1.0~3.3µH
R2 (or R5)
0
50k
87.5k
124k
212.5k
312.5k
R3 (or R6)
100k
100k
100k
100k
100k
100k
NOTE: The minimum output capacitor value is given for different output voltage to make sure the whole converter system is stable. Output capacitance
should increase to support faster load transient requirement.
PART NUMBER
ISL8033
ISL8033A
TABLE 3. SUMMARY OF DIFFERENCES
SWITCHING FREQUENCY
Internally fixed switching frequency FSW = 1MHz
Internally fixed switching frequency FSW = 2.5MHz
2 FN6854.2
March 24, 2011
Free Datasheet http://www.datasheet4u.com/




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