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PDF ISL85412 Data sheet ( Hoja de datos )
| Número de pieza | ISL85412 | |
| Descripción | 150mA Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
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DATASHEET
Wide VIN 150mA Synchronous Buck Regulator
ISL85412
Features
The ISL85412 is a 150mA synchronous buck regulator with an
input range of 3.5V to 40V. It provides an easy to use, high
efficiency low BOM count solution for a variety of applications.
The ISL85412 integrates both high-side and low-side NMOS
FETs and features a PFM mode for improved efficiency at light
loads. This feature can be disabled if forced PWM mode is
desired. The part switches at a default frequency of 700kHz.
By integrating both NMOS devices and providing internal
configuration, minimal external components are required,
reducing BOM count and complexity of design.
With the wide VIN range and reduced BOM, the part provides
an easy to implement design solution for a variety of
applications while giving superior performance. It will provide a
very robust design for high voltage industrial applications as
well as an efficient solution for battery powered applications.
The part is available in a small Pb-free 3mmx3mm TDFN
plastic package with an operation junction temperature range
of -40°C to +125°C.
Related Literature
• AN1929, “ISL85413EVAL1Z, ISL85412EVAL1Z Evaluation
Boards”
• Wide input voltage range of 3.5V to 40V
• Synchronous operation for high efficiency
• No compensation required
• Integrated high-side and low-side NMOS devices
• Selectable PFM or forced PWM mode at light loads
• Internal switching frequency 700kHz
• Continuous output current up to 150mA
• Internal soft-start
• Minimal external components required
• Power-good and enable functions available
Applications
• Industrial control
• Medical devices
• Portable instrumentation
• Distributed power supplies
• Cloud infrastructure
• AN1931, “ISL85413DEMO1Z, ISL85412DEMO1Z Wide VIN
Synchronous Buck Regulator - Short Form”
MODE
VIN
GND
VOUT
GND
+3.5 ... +40V
C1
20µF
MAX 150mA
C8
VOUT
C6
0.1µF
U1 ISL85412
1 MODE
FB
2 BOOT
VCC
3 VIN
PG
R1
8
7 R2
C5
6 1µF
C4
4 PHASE
fSW = 700kHz
EN 5
L1 Device must be
connected to GND
plane with vias.
FIGURE 1. TYPICAL APPLICATION
100
90
80
70
PG
1.5VOUT
3.3VOUT
EN
60
50
1.2VOUT
1.0VOUT
1.8VOUT
2.5VOUT
5.0VOUT
40
0.00
0.03
0.06
0.09
0.12
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, VIN = 12V
0.15
March 13, 2015
FN8378.1
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 2014, 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  
ISL85412
Absolute Maximum Ratings
VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +43V
PHASE to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN + 0.3V (DC)
PHASE to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to 44V (20ns)
EN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +43V
BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +5.5V
COMP, FS, PG, MODE, SS, VCC to GND. . . . . . . . . . . . . . . . . . -0.3V to +5.9V
FB to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +2.95V
Junction Temperature Range at 0A . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
ESD Rating
Human Body Model (Tested per JESD22-A114) . . . . . . . . . . . . . . . .2.5kV
Charged Device Model (Tested per JESD22-C101E). . . . . . . . . . . . . . 1kV
Machine Model (Tested per JESD22-A115). . . . . . . . . . . . . . . . . . . . 200V
Latch-up (Tested per JESD-78A; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance
JA (°C/W) JC (°C/W)
TDFN Package (Note 4, 5) . . . . . . . . . . . . . .
47
4
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Operating Junction Temperature Range . . . . . . . . . . . . . .-40°C to +125°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5V to 40V
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 for details.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications TJ = -40°C to +125°C, VIN = 3.5V to 40V, unless otherwise noted. Typical values are at TA = +25°C. Boldface
limits apply across the junction temperature range.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
(Note 8)
MAX
TYP (Note 8 UNITS
SUPPLY VOLTAGE
VIN Voltage Range
VIN Quiescent Supply Current
VIN Shutdown Supply Current
VCC Voltage
POWER-ON RESET
VIN
IQ VFB = 0.7V, MODE = 0V
ISD EN = 0V, VIN = 40V (Note 6)
VCC VIN = 40V
VIN = 12V; IOUT = 0A to 10mA
3.5
4.5
4.35
40 V
50 µA
1.8 2.5 µA
5.1 5.5 V
5
5.45
V
VCC POR Threshold
Rising Edge
Falling Edge
2.76
3.3
3.46
V
3V
OSCILLATOR
Nominal Switching Frequency
Minimum Off-Time
Minimum On-Time
ERROR AMPLIFIER
fSW fSW = VCC
tOFF VIN = 3.5V
tON (Note 9)
600 700 784 kHz
130 ns
90 ns
Error Amplifier Transconductance Gain
gm
50 µA/V
FB Leakage Current
Current Sense Amplifier Gain
FB Voltage
POWER-GOOD
VFB = 0.6V
RT
TA = -40°C to +125°C
0.84
0.589
1
0.93
0.599
100
1.02
0.606
nA
V/A
V
Lower PG Threshold - VFB Rising
91 94 %
Lower PG Threshold - VFB Falling
81.5
85
%
Upper PG Threshold - VFB Rising
118 121 %
Upper PG Threshold - VFB Falling
107 111
%
PG Propagation Delay
Percentage of the soft-start time
10 %
PG Low Voltage
ISINK = 3mA, EN = VCC, VFB = 0V
0.05 0.3 V
Submit Document Feedback
5
FN8378.1
March 13, 2015
5 Page 
ISL85412
Typical Performance Curves VIN = 12V, VOUT = 3.3V, fSW = 700kHz, TA = +25°C, CIN = 20µF,
COUT = 22µF. (Continued)
PHASE 10V/DIV
PHASE 10V/DIV
VOUT 2V/DIV
VEN 10V/DIV
VOUT 2V/DIV
VEN 10V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 25. START-UP AT 150mA, PFM
PG 5V/DIV
5ms/DIV
FIGURE 26. SHUTDOWN AT 150mA, PFM
VIN 10V/DIV
VOUT 1V/DIV
IL 100mA/DIV
PG 5V/DIV
1ms/DIV
FIGURE 27. START-UP VIN AT 150mA LOAD, PFM
VIN 10V/DIV
VOUT 2V/DIV
IL 100mA/DIV
PG 5V/DIV
1ms/DIV
FIGURE 28. START-UP VIN AT 150mA LOAD, PWM
VIN 10V/DIV
VOUT 2V/DIV
IL 100mA/DIV
PG 5V/DIV
5ms/DIV
FIGURE 29. SHUTDOWN VIN AT 150mA LOAD, PFM
VIN 10V/DIV
VOUT 2V/DIV
IL 100mA/DIV
PG 5V/DIV
5ms/DIV
FIGURE 30. SHUTDOWN VIN AT 150mA LOAD, PWM
Submit Document Feedback 11
FN8378.1
March 13, 2015
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL85412.PDF ] | |
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