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PDF ISL8022 Data sheet ( Hoja de datos )
| Número de pieza | ISL8022 | |
| Descripción | Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
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Dual 2A/1.7A Low Quiescent Current 2.25MHz High
Efficiency Synchronous Buck Regulator
ISL8022
The ISL8022 is a high efficiency, dual synchronous step-down
DC/DC regulator that can deliver up to 2A/1.7A continuous
output current per channel. The channels are 180° out-of-phase
for input RMS current and EMI reduction. The supply voltage
range of 2.8V to 5.5V allows for the use of a single Li+ cell, three
NiMH cells or a regulated 5V input. The current mode control
architecture enables very low duty cycle operation at high
frequency with fast transient response and excellent loop
stability. The ISL8022 operates at 2.25MHz switching frequency
allowing for the use of small, low cost inductors and capacitors.
Each channel is optimized for generating an output voltage as
low as 0.6V.
The ISL8022 has a user configurable mode of operation-forced
PWM mode and PFM/PWM mode. The forced PWM mode
operation reduces noise and RF interference while the PFM
mode operation provides high efficiency by reducing switching
losses at light loads. In PFM mode of operation, both channels
draw a total quiescent current of only 40µA, hence enabling high
light load efficiency in order to maximize battery life.
The ISL8022 offers a 1ms Power-Good (PG) to monitor both
outputs at power-up. When shutdown, ISL8022 discharges the
outputs capacitor. Other features include internal digital
soft-start, enable for power sequence, overcurrent protection,
and thermal shutdown. The ISL8022 is offered in a 4mmx3mm
12 Ld DFN package with 1mm maximum height. The complete
converter occupies less than 1.8cm2 area.
Features
• Dual 2A/1.7A high efficiency synchronous buck regulator with
up to 97% efficiency, low iq (40µA)
• 180° out-of-phase
• Start-up with pre-biased output
• Selectable forced PWM mode and PFM mode
• External synchronization up to 8MHz
• Negative current detection and protection
• 100% maximum duty cycle for lowest dropout
• Internal current mode compensation
• Peak current limiting, hiccup mode short circuit protection and
over-temperature 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 powered devices
• Bar code readers
Related Literature
• AN1554 “ISL8022EVAL1Z Dual 2A/1.7A Low Quiescent
Current 2.25MHz High Efficiency Synchronous Buck Regulator”
• AN1587 “ISL8022EVAL2Z Dual 2A/1.7A Low Quiescent
Current 2.25MHz High Efficiency Synchronous Buck Regulator”
March 14, 2013
FN7650.3
100
90
80 2.5VOUT1PFM
2.5VOUT1PWM
70
3.3VOUT2PFM
60
50 3.3VOUT2 PWM
2.25MHz 5VIN AT +25°C
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
OUTPUT LOAD (A)
2.0
FIGURE 1. CHARACTERISTIC CURVE
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 LLC 2010, 2011, 2013. 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  
ISL8022
Absolute Maximum Ratings (Reference to GND)
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . -0.3V to 6V (DC) or 7V (20ms)
EN1, EN2, PG, SYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to VIN + 0.3V
LX1, LX2. . . . . . . . . . . . . . . . . . . . . . . -1.5V (100ns)/-0.3V (DC) to 6.5V (DC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . or 7V (20ms)
FB1, FB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250V
Charged Device Model (Tested per JESD22-C101E). . . . . . . . . . . . . . . 2k
Latch Up (Tested per JESD-78B; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
4x3 DFN Package (Notes 4, 5) . . . . . . . .
41
3
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-55°C to +150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8V to 5.5V
Load Current Range Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 2A
Load Current Range Channel 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 1.7A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
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. θJA 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. θJC, “case temperature” location is at 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: TA = -40°C to +85°C, VIN = 2.8V to 5.5V, EN1 = EN2 = VIN, SYNC = 0V, L = 1.2µH, C1 = 2 x 10µF, C2 = C4 = 22µF, IOUT1 = 0A to 2A,
IOUT2 = 0A to 1.7A. (Typical values are at TA = +25°C, VIN = 3.6V). Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6)
UNITS
INPUT SUPPLY
VIN Undervoltage Lock-out Threshold
VUVLO
Rising
Falling
2.5 2.8
2.0 2.4
V
V
Quiescent Supply Current
IVIN SYNC = VIN, EN1 = EN2 = VIN, no switches
switching
40 55
µA
SYNC = GND, EN1 = EN2 = VIN, FS = 2.25MHz,
no load at the output
0.86
1
mA
ShutDown Supply Current
OUTPUT REGULATION
ISD VIN = 5.5V, EN1 = EN2 = GND
6.5 12
µA
FB1, FB2 Regulation Voltage
FB1, FB2 Bias Current
Output Voltage Accuracy
VFB_
IFB_
VFB = 0.55V
SYNC = VIN, Io = 0A to 2A
SYNC = GND, Io = 0A to 2A
0.590
0.6
0.1
±1.5
±1
0.610
V
µA
%
%
Line Regulation
Soft-Start Ramp Time Cycle
VIN = VO + 0.5V to 5.5V (minimal 2.8V)
0.2 %/V
1.3 ms
OVERCURRENT PROTECTION
Dynamic Current limit ON-time
tOCON
17 Clock
pulses
Dynamic Current Limit OFF-time
Peak Overcurrent Limit
Peak SKIP Limit
tOCOFF
Ipk1
Ipk2
Iskip1
Iskip2
4 SS cycle
2.7 3.2 3.6
A
2.3 2.8 3.2
A
520 610 730
mA
520 610 730
mA
5 FN7650.3
March 14, 2013
5 Page 
ISL8022
Typical Operating Performance (Unless otherwise noted) operating conditions are:
TA = +25°C, VVIN = 2.8V to 5.5V, EN = VIN, L1 = L2 = 1.2µH, C1 = 10µF, C2 = C4 = 22µF, IOUT1 = 0A to 2A, IOUT2 = 0A to 1.7A. (Continued)
EN1 2V/DIV
VOUT1 1V/DIV
IL1 0.5A/DIV
PG 5V/DIV
TB = 500µs/DIV
FIGURE 26. SOFT-START AT NO LOAD CHANNEL 1 (PFM)
EN2 2V/DIV
VOUT2 1V/DIV
IL2 0.5A/DIV
PG 5V/DIV
TB = 500µs/DIV
FIGURE 27. SOFT-START AT NO LOAD CHANNEL 2 (PFM)
EN1 2V/DIV
VOUT1 1V/DIV
IL1 1A/DIV
PG 5V/DIV
TB = 500µs/DIV
FIGURE 28. SOFT-START AT FULL LOAD CHANNEL 1
EN1 2V/DIV
VOUT1 1V/DIV
IL1 0.2A/DIV
PG 5V/DIV
TB = 200µs/DIV
FIGURE 30. SOFT-DISCHARGE SHUTDOWN CHANNEL 1
EN2 2V/DIV
VOUT2 1V/DIV
IL2 1A/DIV
PG 5V/DIV
TB = 500µs/DIV
FIGURE 29. SOFT-START AT FULL LOAD CHANNEL 2
EN2 2V/DIV
VOUT2 1V/DIV
IL2 0.2A/DIV
PG 5V/DIV
TB = 200µs/DIV
FIGURE 31. SOFT-DISCHARGE SHUTDOWN CHANNEL 2
11 FN7650.3
March 14, 2013
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL8022.PDF ] | |
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