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PDF ISL78233 Data sheet ( Hoja de datos )
| Número de pieza | ISL78233 | |
| Descripción | 3A and 4A Compact Synchronous Buck Regulators | |
| Fabricantes | Intersil | |
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DATASHEET
3A and 4A Compact Synchronous Buck Regulators
ISL78233, ISL78234
The ISL78233, ISL78234 are highly efficient, monolithic,
synchronous step-down DC/DC converters that can deliver 3A
(ISL78233), or 4A (ISL78234) of continuous output current from
a 2.7V to 5.5V input supply. The devices use current mode control
architecture to deliver a very low duty cycle operation at high
frequency with fast transient response and excellent loop stability.
The ISL78233, ISL78234 integrate a very low ON-resistance
P-Channel (35mΩ) high-side FET and N-Channel (11mΩ)
low-side FET to maximize efficiency and minimize external
component count. The 100% duty-cycle operation allows less
than 200mV dropout voltage at 4A output current. The
operation frequency of the Pulse Width Modulator (PWM) is
adjustable from 500kHz to 4MHz. The default switching
frequency of 2MHz is set by connecting the FS pin high.
The ISL78233, ISL78234 can be configured for discontinuous
or forced continuous operation at light load. Forced continuous
operation reduces noise and RF interference, while
discontinuous mode provides higher efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal hiccup mode current
limiting during short circuit and overcurrent conditions. Other
protection, such as overvoltage and over-temperature are also
integrated into the device. A power-good output voltage
monitor indicates when the output is in regulation.
The ISL78233, ISL78234 offers a 1ms Power-good (PG) timer at
power-up. When in shutdown, the ISL78233, ISL78234
discharges the output capacitor through an internal soft-stop
switch. Other features include internal fixed or adjustable
soft-start and internal/external compensation.
The ISL78233, ISL78234 is available in a 3mm x 3mm 16 Ld
Thin Quad Flat Pb-free (TQFN) package with an exposed pad for
improved thermal performance and 1mm maximum height.
The complete converter occupies less than 0.22 in2 area.
The ISL78233, ISL78234 are rated to operate across the
temperature range of -40°C to +125°C.
Features
• 2.7V to 5.5V input voltage range
• Very low ON-resistance FET’s - P-Channel 35mΩ and
N-Channel 11mΩ typical values
• High efficiency synchronous buck regulator with up to 95%
efficiency
• -1.2%/1% reference accuracy over-temperature/load/line
• Complete BOM with as few as 3 external parts
• Internal soft-start - 1ms or adjustable
• Soft-stop output discharge during disable
• Adjustable frequency from 500kHz to 4MHz - default at
2MHz
• External synchronization up to 4MHz
• Over-temperature, overcurrent, overvoltage and negative
overcurrent protection
• Shared common device pinout allows simplified output
power upgrades over time
• Tiny 3mm x 3mm TQFN package
• AEC-Q100 qualified
Applications
• DC/DC POL modules
• μC/µP, FPGA and DSP power
• Video processor/SOC power
• Li-ion battery powered devices
• Automotive infotainment power
Related Literature
• UG015, “ISL7823xEVAL1Z Evaluation Board User Guide”
April 23, 2015
FN8359.5
100
3.3VOUT
90
80
70 2.5VOUT
1.2VOUT
60
1.5VOUT
1.8VOUT
50
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 1. EFFICIENCY vs LOAD (2MHz 5VIN PFM, TA = +25°C)
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 2013-2015. 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  
ISL78233, ISL78234
Absolute Maximum Ratings (Reference to GND)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.8V (DC) or 7V (20ms)
EN, FS, PG, SYNC, VFB . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN + 0.3V
PHASE . . . . . . . . . . . . -1.5V (100ns)/-0.3V (DC) to 6.5V (DC) or 7V (20ms)
COMP, SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Rating
Human Body Model (Tested per AEC-Q100-002) . . . . . . . . . . . . . . . . 5kV
Machine Model (Tested per AEC-Q100-003) . . . . . . . . . . . . . . . . . . 300V
Charge Device Model (Tested per AEC-Q100-011) . . . . . . . . . . . . . . . 2kV
Latch-up (Tested per AEC-Q100-004, Class II, Level A) . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance
JA (°C/W) JC (°C/W)
16 LD TQFN Package (Notes 4, 5) . . . . . . .
43
3.5
Operating Junction Temperature Range . . . . . . . . . . . . . .-55°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 4A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°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. 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. JC, “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 and
the typical specification are measured at the following conditions: TA = -40°C to +125°C, VIN = 3.6V, EN = VIN, unless otherwise noted. Typical values are
at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +125°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6) UNITS
INPUT SUPPLY
VIN Undervoltage Lockout Threshold
VUVLO
Rising, no load
Falling, no load
2.5 2.7
2.2 2.45
V
V
Quiescent Supply Current
IVIN SYNC = GND, no load at the output
SYNC = GND, no load at the output and no
switches switching
45 µA
45 60 µA
Shutdown Supply Current
OUTPUT REGULATION
SYNC = VIN, FS = 2MHz, no load at the output
ISD SYNC = GND, VIN = 5.5V, EN = low
19 25 mA
3.8 10
µA
Reference Voltage
VFB Bias Current
Line Regulation
Soft-start Ramp Time Cycle
VREF
IVFB
VFB = 0.75V
VIN = VO + 0.5V to 5.5V (minimal 2.7V)
SS = SGND
0.593
0.600
0.1
0.2
1
0.606
V
µA
%/V
ms
Soft-start Charging Current
OVERCURRENT PROTECTION
ISS VSS = 0.1V
1.7 2.1 2.5
µA
Current Limit Blanking Time
tOCON
17 Clock
pulses
Overcurrent and Auto Restart Period
Positive Peak Current Limit
Peak Skip Limit
Zero Cross Threshold
tOCOFF
IPLIMIT
ISKIP
ISL78234, TA = +25°C
ISL78234, TA = -40°C to +125°C
ISL78233, TA = +25°C
ISL78233, TA = -40°C to +125°C
ISL78234, TA = +25°C
ISL78234, TA = -40°C to +125°C
ISL78233, TA = +25°C
ISL78233, TA = -40°C to +125°C
8 SS cycle
5.4 6.7 8.1
A
5.2 9 A
3.9 4.9
6
A
3.7 6.6 A
0.9 1.1 1.35
A
0.84
1.5 A
0.7 0.9 1.2
A
0.6 1.3 A
-275
375 mA
Submit Document Feedback
5
FN8359.5
April 23, 2015
5 Page 
ISL78233, ISL78234
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VVIN = 5V,
EN = VIN, SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A. (Continued)
VOUT RIPPLE 100mV/DIV
ILOAD 2A/DIV
200µs/DIV
FIGURE 27. LOAD TRANSIENTS (PWM)
ILOAD 2A/DIV
VOUT RIPPLE 100mV/DIV
200µs/DIV
FIGURE 28. LOAD TRANSIENTS (PFM)
VOUT 1V/DIV
PHASE 5V/DIV
IL 2A/DIV
PG 5V/DIV
4µs/DIV
FIGURE 29. OUTPUT SHORT CIRCUIT
VOUT 1V/DIV
IL 5A/DIV
PG 5V/DIV
40µs/DIV
FIGURE 30. OVERCURRENT PROTECTION
PHASE 5V/DIV
VOUT 2V/DIV
IL 5A/DIV
PG 5V/DIV
20µs/DIV
FIGURE 31. OVERVOLTAGE PROTECTION
Submit Document Feedback 11
VOUT 1V/DIV
PG 2V/DIV
20ms/DIV
FIGURE 32. OVER-TEMPERATURE PROTECTION
FN8359.5
April 23, 2015
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL78233.PDF ] | |
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