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PDF ISL95210 Data sheet ( Hoja de datos )
| Número de pieza | ISL95210 | |
| Descripción | 10A Buck Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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High Efficiency 5V, 10A Buck Regulator
ISL95210
The ISL95210 is a high-efficiency step-down regulator that can
deliver 10A of output current from a 5V input. The small
4mmx6mm QFN package and only four external components
provide a very small total solution size. Low resistance internal
MOSFETs deliver excellent efficiency and permit full power
operation in a +90°C ambient without airflow.
The regulator operates from an input voltage of 2.97V to 5.5V,
and provides a 0.6% accurate output voltage over the full
operating temperature range. Intersil's patented R4™ control
architecture provides exceptional transient response with no
external compensation components. The output voltage may be
programmed by an internal DAC or by an external resistor divider
(see “Output Voltage Programming” on page 11 for more
details).
Several digital control signals provide flexibility for users that
want additional features. Switching frequency, switching mode,
output voltage margining and daisy-chained power-good
functions are all programmed by these pins. The ISL95210 also
includes comprehensive internal protection for overvoltage,
undervoltage, overcurrent and over-temperature conditions.
Related Literature
• See AN1485, “ISL95210 10A Integrated FET Regulator
Evaluation Board Setup Procedure”
Features
• 10A Continuous Output Current
• 2.97V to 5.5V Input Voltage Range
• Up to 95% Efficiency
• Full Power Operation in +90°C Ambient without Airflow
• R4™ Control Architecture Delivers Excellent Transient
Response Without Compensation
• Pin Selectable Output Voltage Programming
• ±0.6% Output Voltage Accuracy Over Full Operating
Temperature Range
• Programmable Enhanced Light-Load Efficiency Operation
• Output Voltage Margining and Power-good Monitor
• Small 6mmx4mm QFN Package
Applications
• Point-of-Load Power Supplies
• Notebook Computer Power
• General Purpose Power Rail Generation
VIN = 5V
CIN
10µF
VCC
CONTROL
SIGNALS
VIN
PVCC
PGOOD
ISL95210
PHASE
EN
PG_IN
FSET
VSEL1
MPCT
MSEL
VSEL0
FCCM
VOUT
VCC
AGND
PGND
T-PAD
POWER GOOD
LOUT
420nH
VOUT = 1.2V
+
COUT
220µF
1µF
FSW= 800kHz
LOUT = MPC0740LR42C (NEC/TOKIN)
COUT = 2TPLF220M5 (SANYO)
FIGURE 1. 10A DC/DC CONVERTER USING ONLY 4 EXTERNAL
COMPONENTS
100
95
90
85
80
75
70
65
60
VIN = 5V
55 VOUT = 1.2V
FSW = 800kHz
50
0 1 2 3 4 5 6 7 8 9 10
IOUT (A)
FIGURE 2. EFFICIENCY OF CIRCUIT SHOWN IN FIGURE 1
(INCLUDES INDUCTOR LOSSES)
December 15, 2011
FN6938.4
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. 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  
ISL95210
Absolute Maximum Ratings
All pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V (DC)
PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to +10V (< 10ns)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 8V (< 10ns)
Recommended Operating Conditions
VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±10%
PVCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±10%
VIN Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.97V to +5.5V
Junction Temperature (ISL95210HRZ) . . . . . . . . . . . . . . .-10°C to +125°C
Junction Temperature (ISL95210IRZ) . . . . . . . . . . . . . . . .-40°C to +125°C
Thermal Information
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
32 Ld QFN Package (Notes 4, 5) . . . . . . . .
40
4
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Specified. Boldface limits apply over the operating
temperature range (-10°C to +100°C for ISL95210HRZ; -40°C to +100°C for ISL95210IRZ).
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7) UNITS
BIAS SUPPLIES
Shutdown Supply Current [PVCC]
EN = low, VIN = PVCC = high
0.4 10
µA
Switching Supply Current [PVCC]
EN = high, VCC = high, FSET = GND(400kHz), FCCM = high
7.2 mA
EN = high, VCC = high, FSET = FLOAT (533kHz), FCCM = high 8.9 mA
EN = high, VCC = high, FSET = high (800kHz), FCCM = high
12.2
mA
Standby Supply Current [PVCC]
EN = high, VCC = high, FCCM = low, IOUT = 0A
1.9 2.7
mA
VCC POR (Power-On Reset) Threshold
VCC rising
4.25
4.50
V
VCC falling
4.00
4.25
V
PWM MODULATOR
Oscillator Frequency Accuracy, FSW (ISL95210HRZ) FSET = GND (400kHz)/FLOAT (533kHz)/VCC (800kHz),
TA = +25°C
FSET = GND (400kHz)/FLOAT (533kHz)/VCC (800kHz),
-10°C to +100°C
-5
-10
5%
10 %
Oscillator Frequency Accuracy, FSW (ISL95210IRZ) FSET = GND (400kHz)/FLOAT (533kHz)/VCC (800kHz),
-40°C to +100°C
-15
15 %
CONTROL THRESHOLDS
EN Rising Threshold
2.0 V
EN Falling Threshold
1.0 V
FCCM, MPCT, MSEL, FSET, VSEL_
Input Low Threshold
1.20 1.50 1.80
V
FCCM, MPCT, MSEL, FSET, VSEL_
Input Floating Voltage
Input impedance > 1MΩ
1.85 2.00 2.15
V
FCCM, MPCT, MSEL, FSET, VSEL_
Input High Threshold
2.2 2.50 2.8
V
5 FN6938.4
December 15, 2011
5 Page 
ISL95210
Theory of Operation
The following sections will provide a detailed description of the
inner workings of the ISL95210 10A integrated FET regulator.
Start -Up
The ISL95210 will not respond to any logic inputs until VCC and
PVCC are above the power-on reset (POR) level as described in
the “Electrical Specifications” table on page 5. Once the POR
condition is achieved, the ISL95210 will then acknowledge the
states of its logic inputs. If the EN pin is pulled above the rising
threshold, the regulator is commanded on and the soft-start
sequence is initiated.
During soft-start, the programmed output voltage set point is
determined by the logic states of VSEL0, VSEL1, MPCT and MSEL.
The output then ramps digitally to the regulation voltage in
2.5mV/µs steps. Once the output voltage achieves regulation,
the power-good monitor output (PGOOD) is toggled high to the
voltage provided on the PG_IN pin. Figure 25 illustrates the ideal
soft-start behavior.
PPGGO_ODOUT
EENN
DADCACVVoOlLtTaAgGeE
VVOOUUTT
22.55mmVV
11µuss
ttSSSS
FIGURE 25. IDEALIZED SOFT-START WAVEFORM
Using the values in Tables 1 and 2, the soft-start interval can be
easily calculated by Equation 1.
tSS=
--V----D----A----C---
0.0025
(EQ. 1)
The units of Equation 1 are in microseconds. For example:
- VDAC = 1.200V
- tSS = 1.200V / 0.0025 = 480µs
The fixed soft-start slew rate of 2.5mV/µs allows for easy
calculation of the in-rush current.
IINRUSH= (2500 ⋅ COUT)
(EQ. 2)
Consequently, the in-rush is manageable for all practical values
of output capacitance. For example:
- COUT = 330µF
- Inrush Current = 2500*330µF = 0.825A
Output Voltage Programming
The highly integrated nature of the ISL95210 simplifies design
and reduces component count. The VSEL0 and VSEL1 pins are
3-state logic inputs to an integrated DAC that controls the output
voltage set point as prescribed in Table 1.
TABLE 1. DAC CONTROLLED OUTPUT VOLTAGE SETTINGS
VSEL1
VSEL0
VOUT (V)
00
0.600
0 FLOAT
0.750
01
0.900
FLOAT
0
1.000
FLOAT
FLOAT
1.050
FLOAT
1
1.100
10
1.200
1 FLOAT
1.500
11
1.800
NOTE: 1 = Input High, 0 = Input Low, FLOAT = Input unconnected or high-Z
(see “Electrical Specifications” table for details).
This allows the user to program the output voltage without the
use of a resistor divider network. However, if the user wishes to
program values of VOUT away from the DAC values, a resistor
divider can be used. However, because the input impedance of
the VOUT pin is relatively low, the top resistor in the divider stack
(R1 in Figure 31) must be kept small to minimize regulation error
as the internal resistance changes over-temperature and process
tolerances. A 100Ω resistor is recommended. The bottom
resistor in the divider stack (R2 in Figure 31) can be derived from
Equation 3:
R2=
--------------------------------------R-----1-----⋅---V----D----A----C----------------------------------------
VOUT
+
⎛
⎝
2--2---0⋅---R5----k-1--⎠⎞
–
⎛
⎝
2----0---52----0k---5--+--k--R-----1-⎠⎞
⋅
VDAC
(EQ. 3)
For example:
- Desired VOUT = 1.35V
- VDAC = 1.32V (1.2V +10% margin)
- R1 = 100Ω
- R2 = 4.351kΩ (select nearest standard value)
NOTE: The resistor divider should not be used to program VOUT
more than 5% away from any preset DAC value. If this limit is
exceeded, the modulator will be severely imbalanced and may
result in loop instability and regulator shutdown.
The use of a resistor network also limits the soft discharge
feature of the ISL95210. More detail on this operation can be
found in the “Soft-Discharge” on page 15.
In addition to digitally controlled output voltage programming,
the ISL95210 includes the ability to margin the output voltage up
and down from the set point for use in end-of-line manufacturing
reliability tests. The MPCT pin controls the amount of margining
desired by the user and the MSEL pin determines when
margining is engaged. In all margining conditions, the output
voltage is slewed to the new value at the soft-start rate of
11 FN6938.4
December 15, 2011
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL95210.PDF ] | |
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