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High Performance 2A and 3A Linear Regulators
ISL80102, ISL80103
The ISL80102 and ISL80103 are low voltage, high-current, single output LDOs specified for 2A and 3A output current, respectively. These LDOs operate from input voltages of 2.2V to 6V and are capable of providing output voltages of 0.8V to 5V on the adjustable VOUT versions. Fixed output voltage options are available in 1.5V, 1.8V, 2.5V, 3.3V and 5V. Other custom voltage options available upon request. For applications that demand in-rush current less than the current limit, an external capacitor on the soft start pin provides adjustment. The ENABLE feature allows the part to be placed into a low quiescent current shutdown mode. A sub-micron BiCMOS process is utilized for this product family to deliver the best in class analog performance and overall value. These CMOS LDOs will consume significantly lower quiescent current as a function of load over bipolar LDOs, which translates into higher efficiency and the ability to consider packages with smaller footprints. Quiescent current is modestly compromised to enable a leading class fast load transient response, and hence a lower total AC regulation band for an LDO in this category.
ISL80102, ISL80103
Features
* Stable with all Capacitor Types (Note 11) * 2A and 3A Output Current Ratings * 2.2V to 6V Input Voltage Range * 1.8% VOUT Accuracy Guaranteed Over Line, Load and TJ = -40C to +125C * Very Low 120mV Dropout Voltage at 3A (ISL80103) * Fixed and Adjustable VOUT Versions * Very Fast Transient Response * Excellent 62dB PSRR * 100VRMS Output Noise * Power-Good Output * Adjustable In-Rush Current Limiting * Short Circuit and Over-Temperature Protection * Available in a 10 Ld DFN (now), 5Ld TO220 and 5Ld TO263 (soon)
Applications*(see page 14)
* Servers * Telecommunications and Networking * Medical Equipment * Instrumentation Systems * Routers and Switchers
Typical Application
ISL80102, ISL80103 2.5V 10% VIN CIN 10F 1.8V 1.8% 9 10 VIN VIN VOUT VOUT 1 2 COUT 10F VOUT
RPG ON OFF 7 6 *CSS ENABLE SS GND 5 *CSS is optional, (see Note 12) on page 5. SENSE 3 100k
4 PG
PGOOD
March 22, 2010 FN6660.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2009, 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL80102, ISL80103
Block Diagram
VIN R5 10A 10A M5 M4 M3 M1 POWER PMOS IL LEVEL SHIFT + EN 500mV R4 IL/10,000
VOUT
R8 R7 R9
+ EN EN + -
M6
R1 R2
SENSE
ADJ PG M2 *R3 GND
EN ENABLE SS M8 EN M7 V TO I
500mV + + 485mV -
+
*R3 is open for ADJ versions.
Ordering Information
PART NUMBER (Notes 1, 2, 4) ISL80102IRAJZ ISL80102IR15Z ISL80102IR18Z ISL80102IR25Z ISL80102IR33Z ISL80102IR50Z ISL80103IRAJZ ISL80103IR15Z ISL80103IR18Z ISL80103IR25Z ISL80103IR33Z ISL80103IR50Z NOTES: 1. Add "-T" or "-TK" suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. The 1.5V, 3.3V and 5V fixed output voltages will be released in the future. Please contact Intersil Marketing for more details. 4. For Moisture Sensitivity Level (MSL), please see device information page for ISL80102, ISL80103. For more information on MSL please see tech brief TB363. PART MARKING DZJA DZMA DZNA DZPA DZRA DZSA DZAA DZDA DZEA DZFA DZGA DZHA VOUT VOLTAGE ADJ 1.5V (Note 3) 1.8V 2.5V 3.3V (Note 3) 5.0V (Note 3) ADJ 1.5V (Note 3) 1.8V 2.5V 3.3V (Note 3) 5.0V (Note 3) TEMP. RANGE (C) -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 PACKAGE (Pb-Free) 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN 10 Ld 3x3 DFN PKG DWG. # L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3 L10.3x3
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Pin Configuration
ISL80102, ISL80103 (10 LD 3X3 DFN) TOP VIEW
VOUT VOUT SENSE/ADJ PG GND 1 2 3 4 5 10 VIN 9 VIN 8 DNC 7 ENABLE 6 SS
Pin Descriptions
PIN NUMBER 1, 2 3 4 5 6 7 8 9, 10 PIN NAME VOUT SENSE/ADJ PG GND SS ENABLE DNC VIN EPAD Output voltage pin. Remote voltage sense for internally fixed VOUT options. ADJ pin for externally set VOUT. VOUT in regulation signal. Logic low defines when VOUT is not in regulation. Must be grounded if not used. GND pin. External cap adjusts in-rush current. VIN independent chip enable. TTL and CMOS compatible. Do not connect this pin to ground or supply. Leave floating. Input supply pin. EPAD at ground potential. Soldering it directly to GND plane is optional. DESCRIPTION
Typical Application
ISL80102, ISL80103 2.5V 10% VIN CIN 10F R1 10k 7 6 PG ENABLE **CPB SS GND 5 *CSS is optional, (see Note 12) on page 5. **CPB is optional. See "Functional Description" on page 12 for more information. ADJ 3 1500pF R3 2.61k 4 PGOOD 1.8V 9 10 VIN VIN VOUT VOUT 1 2 COUT 10F RPG 100k VOUT
EN OPEN DRAIN COMPATIBLE
*CSS
R4 1.0k
FIGURE 1. TYPICAL APPLICATION DIAGRAM
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Absolute Maximum Ratings (Note 7)
VIN relative to GND . . . . . . . . . . . . . . . . . . -0.3V to +6.5V VOUT relative to GND . . . . . . . . . . . . . . . . . -0.3V to +6.5V PG, ENABLE, SENSE/ADJ, SS Relative to GND. . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
Thermal Information
Thermal Resistance (Typical) JA (C/W) JC (C/W) 10 Ld 3x3 DFN Package (Notes 5, 6) 48 4 Maximum Junction Temperature (Plastic Package). . . +150C Storage Temperature Range . . . . . . . . . . . -65C to +150C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
(Note 10) Junction Temperature Range (TJ) . . VIN relative to GND . . . . . . . . . . . . VOUT range . . . . . . . . . . . . . . . . . . PG, ENABLE, SENSE/ADJ, SS relative PG sink current . . . . . . . . . . . . . . . . . . . . -40C to +125C . . . . . . . . . 2.2V to 6V . . . . . . . . 800mV to 5V to GND . . . . . 0V to 6V . . . . . . . . . . . . . 10mA
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: 5. 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. 6. For JC, the "case temp" location is the center of the exposed metal pad on the package underside. 7. ABS max voltage rating is defined as the voltage applied for a lifetime average duty cycle above 6V of 1%.
Electrical Specifications
Unless otherwise noted, all parameters are established over the following specified conditions: VIN = VOUT + 0.4V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, ILOAD = 0A Applications must follow thermal guidelines of the package to determine worst case junction temperature. Please refer to "Functional Description" on page 12 and Tech Brief TB379. Boldface limits apply over the operating temperature range, -40C to +125C. Pulse load techniques used by ATE to ensure TJ = TA defines established limits. SYMBOL TEST CONDITIONS MIN MAX (Note 8) TYP (Note 8) UNITS
PARAMETER DC CHARACTERISTICS DC Output Voltage Accuracy
VOUT
VOUT Options: 1.8V. VIN =2.2V; ILOAD = 0A VOUT Options: 1.8V. 2.2V < VIN < 3.6V; 0A < ILOAD < 3A VOUT Options: 2.5V VIN =VOUT + 0.4V; ILOAD = 0A VOUT Options: 2.5V VOUT + 0.4V < VIN < 6V; 0A < ILOAD < 3A -1.8 491 -1.8
0.5 1.8 0.5 -1.8 500 0.1 0.1 -0.8 -0.6 0.01 7.5 8.5 0.4 3.3 120 81 16 185 125 1 9 12 509 0.4 0.8
% % % % mV % % % % A mA mA A A mV mV
Feedback Pin (ADJ Version) DC Input Line Regulation
VFB VOUT/VIN
2.2V < VIN < 6V, 0A < ILOAD < 3A VOUT + 0.4V < VIN < 3.6V, VOUT = 1.8V VOUT + 0.4V < VIN < 6V, VOUT = 2.5V
DC Output Load Regulation
VOUT/IOUT 0A < ILOAD < 3A, All voltage options 0A < ILOAD < 2A, All voltage options VADJ = 0.5V IQ ISHDN VDO ILOAD = 0A, 2.2V < VIN < 6V ILOAD = 3A, 2.2V < VIN < 6V ENABLE Pin = 0.2V, VIN = 5V ENABLE Pin = 0.2V, VIN = 6V ILOAD = 3A, VOUT = 2.5V, 10 LD 3x3 DFN ILOAD = 2A, VOUT = 2.5V, 10 LD 3x3 DFN
Feedback Input Current Ground Pin Current
Ground Pin Current in Shutdown Dropout Voltage (Note 9)
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Electrical Specifications
Unless otherwise noted, all parameters are established over the following specified conditions: VIN = VOUT + 0.4V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, ILOAD = 0A Applications must follow thermal guidelines of the package to determine worst case junction temperature. Please refer to "Functional Description" on page 12 and Tech Brief TB379. Boldface limits apply over the operating temperature range, -40C to +125C. Pulse load techniques used by ATE to ensure TJ = TA defines established limits. SYMBOL ISC TEST CONDITIONS VOUT = 0V, VOUT + 0.4V < VIN < 6V VOUT = 0V, VOUT + 0.4V < VIN < 6V TSD TSDn VOUT + 0.4V < VIN < 6V VOUT + 0.4V < VIN < 6V MIN MAX (Note 8) TYP (Note 8) UNITS 5.0 2.8 160 15 A A C C
PARAMETER Output Short Circuit Current (3A Version) Output Short Circuit Current (2A Version) Thermal Shutdown Temperature Thermal Shutdown Hysteresis (Rising Threshold) AC CHARACTERISTICS Input Supply Ripple Rejection Output Noise Voltage
PSRR
f = 1kHz, ILOAD = 1A; VIN = 2.2V f = 120Hz, ILOAD = 1A; VIN = 2.2V ILOAD = 10mA, BW = 300Hz < f < 300kHz
55 62 100
dB
VRMS 0.95 V mV s 1 A
ENABLE PIN CHARACTERISTICS Turn-on Threshold Hysteresis (Rising Threshold) Enable Pin Turn-on Delay Enable Pin Leakage Current SOFT-START CHARACTERISTICS Reset Pull-Down resistance Soft Start Charge Current PG PIN CHARACTERISTICS VOUT PG Flag Threshold VOUT PG Flag Hysteresis PG Flag Low Voltage PG Flag Leakage Current NOTES: 8. Parameters with MIN and/or MAX limits are 100% tested at +25C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 9. Dropout is defined by the difference in supply VIN and VOUT when the supply produces a 2% drop in VOUT from its nominal value. 10. Electromigration specification defined as lifetime average junction temperature of +110C where max rated DC current = lifetime average current. 11. Minimum cap of 10F X5R/X7R on VIN and VOUT required for stability. 12. If the current limit for in-rush current is acceptable in application, do not use this feature. Used only when large bulk capacitance required on VOUT for application. ISINK = 500A VIN = 6V, PG = 6V 75 84 4 47 0.05 100 1 92 %VOUT % mV A RPD ICHG -7 323 -4.5 -2 A VEN(HIGH) VEN(HYS) tEN 2.2V < VIN < 6V 2.2V < VIN < 6V COUT = 10F, ILOAD = 1A VIN = 6V, EN = 3V 0.3 0.8 135 150
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Typical Operating Performance
Unless otherwise noted: VIN = 2.2V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, IL = 0A.
1.8 1.2 0.6 0 -0.6 -1.2 -1.8 -50 2.0 1.8 OUTPUT VOLTAGE (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C) 150 0 0 1 3 2 4 SUPPLY VOLTAGE (V) 5 6 +25C -40C +125C
VOUT (%)
FIGURE 2. VOUT vs TEMPERATURE
FIGURE 3. OUTPUT VOLTAGE vs SUPPLY VOLTAGE
1.8 1.2 VOUT (%) 0.6 0.0 -0.6 -1.2 -1.8 GROUND CURRENT (mA) 2.5 3.0
9 8 7 6 5 4 3 2 1 0 2 3 4 INPUT VOLTAGE (V) 5 6
+25C
-40C +125C
0 0.5 1.0 1.5 2.0 OUTPUT CURRENT (A)
FIGURE 4. VOUT vs OUTPUT CURRENT
FIGURE 5. GROUND CURRENT vs SUPPLY VOLTAGE
9.1 GROUND CURRENT (mA) 8.9 CURRENT (mA) 8.7 8.5 8.3 8.1 7.9 7.7 7.5 0 0.5 1.0 1.5 2.0 OUTPUT CURRENT (A) 2.5 3.0
12.0 11.5 11.0
-40C
-40C
10.5 10.0 9.5 9.0 8.5 8.0 7.5 0.8 1.4
+25C +125C
+125C +25C
2.0 2.6 3.2 3.8 OUTPUT VOLTAGE (V) 4.4 5.0
FIGURE 6. GROUND CURRENT vs OUTPUT CURRENT
FIGURE 7. GROUND CURRENT vs OUTPUT VOLTAGE
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Typical Operating Performance
Unless otherwise noted: VIN = 2.2V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, IL = 0A. (Continued)
5.0 4.5 GROUND CURRENT (A) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -25 -10 5 VIN = 5V 20 35 50 65 80 95 110 125 TEMPERATURE (C) GROUND CURRENT (A) 12 11 10 9 8 7 6 5 4 3 2 1 0 -40 -25 -10
VIN = 6V 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
FIGURE 8. SHUTDOWN CURRENT vs TEMPERATURE
FIGURE 9. SHUTDOWN CURRENT vs TEMPERATURE
150 140 130 120 110 2A 100 90 3A 80 70 60 50 40 30 20 1A 10 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
0
0.5
1.0 1.5 2.0 OUTPUT CURRENT (A)
2.5
3.0
FIGURE 10. DROPOUT VOLTAGE vs TEMPERATURE
FIGURE 11. DROPOUT VOLTAGE vs OUTPUT CURRENT
0.90 0.85 0.80 0.75 VOLTAGE (V) 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -40 -25 -10 5 20 35 50 65 80 95 110 125 JUNCTION TEMPERATURE (C) VOUT (1V/DIV) SS (1V/DIV) VIN (1V/DIV)
PG (1V/DIV) TIME (10ms/DIV)
FIGURE 12. ENABLE THRESHOLD VOLTAGE vs TEMPERATURE
FIGURE 13. POWER-UP (VIN = 2.2V)
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Typical Operating Performance
Unless otherwise noted: VIN = 2.2V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, IL = 0A. (Continued)
EN (1V/DIV) VIN (1V/DIV) SS (1V/DIV) SS (1V/DIV)
VOUT (1V/DIV)
VOUT (1V/DIV)
PG (1V/DIV) TIME (10ms/DIV)
PG (1V/DIV) TIME (50s/DIV)
FIGURE 14. POWER-DOWN (VIN = 2.2V)
FIGURE 15. ENABLE START-UP
300 EN (1V/DIV) START-UP TIME (s) 250 200 150 100 50 0 2.0
SS (1V/DIV)
VOUT (1V/DIV)
PG (1V/DIV) TIME (5ms/DIV)
2.5
3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V)
5.5
6.0
FIGURE 16. ENABLE SHUTDOWN
FIGURE 17. START-UP TIME vs SUPPLY VOLTAGE
300 250 200 150 100 50 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 JUNCTION TEMPERATURE (C)
7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -25 -10
START-UP TIME (s)
CURRENT LIMIT (A)
ISL80103
ISL80102
5
20 35 50 65 80 95 110 125
JUNCTION TEMPERATURE (C)
FIGURE 18. START-UP TIME vs TEMPERATURE
FIGURE 19. CURRENT LIMIT vs TEMPERATURE
8
FN6660.1 March 22, 2010
ISL80102, ISL80103
Typical Operating Performance
Unless otherwise noted: VIN = 2.2V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, IL = 0A. (Continued)
6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 2.0
CURRENT LIMIT (A)
ISL80103
VOUT (1V/DIV)
ISL80102
2.5
3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V)
5.5
6.0
IOUT (1A/DIV) TIME (10ms/DIV)
FIGURE 20. CURRENT LIMIT vs SUPPLY VOLTAGE
FIGURE 21. CURRENT LIMIT RESPONSE (ISL80102)
VOUT (1V/DIV)
VOUT (1V/DIV)
IOUT (1A/DIV) TIME (100ms/DIV)
IOUT (2A/DIV)
FIGURE 22. THERMAL CYCLING (ISL80102)
FIGURE 23. CURRENT LIMIT RESPONSE (ISL80103)
TIME (20ms/DIV)
EN (1V/DIV)
VOUT (1V/DIV)
IOUT (2A/DIV)
IOUT (2A/DIV)
VOUT (1V/DIV)
TIME (50ms/DIV)
TIME (1ms/DIV)
FIGURE 24. THERMAL CYCLING (ISL80103)
FIGURE 25. IN-RUSH CURRENT WITH NO SOFT-START CAPACITOR, COUT = 1000F
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Typical Operating Performance
Unless otherwise noted: VIN = 2.2V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, IL = 0A. (Continued)
EN (1V/DIV) EN (1V/DIV)
IOUT (2A/DIV)
IOUT (2A/DIV)
VOUT (1V/DIV)
VOUT (1V/DIV)
TIME (1ms/DIV)
TIME (1ms/DIV)
FIGURE 26. IN-RUSH WITH 22nF SOFT-START CAPACITOR, COUT = 1000F
FIGURE 27. IN-RUSH WITH 47nF SOFT-START CAPACITOR, COUT = 1000F
VOUT (50mV/DIV)
VOUT (50mV/DIV)
IOUT (2A/DIV)
IOUT (2A/DIV)
di/dt = 30A/s di/dt = 30A/s TIME (200s/DIV) TIME (200s/DIV)
FIGURE 28. LOAD TRANSIENT 0A TO 3A, COUT = 10F CERAMIC
FIGURE 29. LOAD TRANSIENT 0A TO 3A, COUT = 10F CERAMIC + 100F OSCON
VOUT (50mV/DIV)
VOUT (50mV/DIV)
IOUT (2A/DIV)
IOUT (2A/DIV)
di/dt = 30A/s
di/dt = 30A/s
TIME (200s/DIV)
TIME (200s/DIV)
FIGURE 30. LOAD TRANSIENT 1A TO 3A, COUT = 10F CERAMIC
FIGURE 31. LOAD TRANSIENT 1A TO 3A, COUT = 10F CERAMIC + 100F OSCON
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Typical Operating Performance
Unless otherwise noted: VIN = 2.2V, VOUT = 1.8V, CIN = COUT = 10F, TJ = +25C, IL = 0A. (Continued)
VOUT (20mV/DIV) VOUT (20mV/DIV)
IOUT (2A/DIV)
di/dt = 3A/sec IOUT (2A/DIV)
di/dt = 3A/s TIME (50s/DIV)
di/dt = 3A/s TIME (50s/DIV)
FIGURE 32. LOAD TRANSIENT 0A TO 3A, COUT = 10F CERAMIC, No CPB (ADJ VERSION)
FIGURE 33. LOAD TRANSIENT 0A TO 3A, COUT = 10F CERAMIC, CPB = 1500pF (ADJ VERSION)
3.2V 80 2.2V VIN (1V/DIV) 70 60 50 dB 40 30 VOUT (10mV/DIV) 20 10 0 10 TIME (200s/DIV) 100 1k 10k FREQUENCY (Hz) 100k 1M 100mA 1A
FIGURE 34. LINE TRANSIENT
80 70 NOISE V/Hz 60 50 dB 40 30 20 10 0 IL = 100mA 10 100 1k 10k 10F 47F 1M 100F 1 10
FIGURE 35. PSRR vs LOAD
0.1
100k
0.01 10
100
FREQUENCY (Hz)
1k 10k FREQUENCY (Hz)
100k
1M
FIGURE 36. PSRR vs COUT
FIGURE 37. SPECTRAL NOISE DENSITY vs FREQUENCY
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FN6660.1 March 22, 2010
ISL80102, ISL80103
Functional Description
Input Voltage Requirements
Despite other output voltages offered, this family of LDOs is optimized for a true 2.5V to 1.8V conversion where the input supply can have a tolerance of as much as 10% for conditions noted in the "Electrical Specifications" table on page 4. Minimum guaranteed input voltage is 2.2V, however, due to the nature of an LDO, VIN must be some margin higher than the output voltage plus dropout at the maximum rated current of the application if active filtering (PSRR) is expected from VIN to VOUT. The dropout spec of this family of LDOs has been generously specified in order to allow applications to design for a level of efficiency that can accommodate the smaller outline package for those applications that cannot accommodate the profile of the TO220/263.
capacitances on VOUT where high levels of charging current can be seen for a significant period of time. The in-rush currents can cause VIN to drop below minimum which could cause VOUT to shutdown. Figure 38 shows the relationship between in-rush current and CSS with a COUT of 1000F.
5.0 IN-RUSH CURRENT LIMIT (A) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 20 40 60 CSS (nF) 80 100
Enable Operation
The Enable turn-on threshold is typically 770mV with a hysteresis of 135mV. An internal pull-up or pull-down resistor is available upon request. As a result, this pin must not be left floating. This pin must be tied to VIN if it is not used. A 1k to 10k pull-up resistor will be required for applications that use open collector or open drain outputs to control the Enable pin. The Enable pin may be connected directly to VIN for applications that are always on.
FIGURE 38. IN-RUSH CURRENT vs SOFT-START CAPACITANCE
Output Voltage Selection
An external resistor divider is used to scale the output voltage relative to the internal reference voltage. This voltage is then fed back to the error amplifier. The output voltage can be programmed to any level between 0.8V and 5V. An external resistor divider, R3 and R4, is used to set the output voltage as shown in Equation 1. The recommended value for R4 is 500 to 1k. R3 is then chosen according to Equation 2:
R3 V OUT = 0.5V x ------ + 1 R4 V OUT R 3 = R 4 x --------------- - 1 0.5V (EQ. 1)
Power-Good Operation
Applications not using this feature must connect this pin to ground. The PGOOD flag is an open-drain NMOS that can sink up to 10mA during a fault condition. The PGOOD pin requires an external pull-up resistor which is typically connected to the VOUT pin. The PGOOD pin should not be pulled up to a voltage source greater than VIN. The PGOOD fault can be caused by the output voltage going below 84% of the nominal output voltage, or the current limit fault, or low input voltage. The PGOOD does not function during thermal shutdown. The PGOOD functions in shutdown.
(EQ. 2)
External Capacitor Requirements
External capacitors are required for proper operation. Careful attention must be paid to the layout guidelines and selection of capacitor type and value to ensure optimal performance. OUTPUT CAPACITOR The ISL80102, ISL80103 applies state-of-the-art internal compensation to keep selection of the output capacitor simple for the customer. Stable operation over full temperature, VIN range, VOUT range and load extremes are guaranteed for all capacitor types and values assuming a 10F X5R/X7R is used for local bypass on VOUT. This minimum capacitor must be connected to VOUT and Ground pins of the LDO with PCB traces no longer than 0.5cm. Lower cost Y5V and Z5U type ceramic capacitors are acceptable if the size of the capacitor is larger to compensate for the significantly lower tolerance over X5R/X7R types. Additional capacitors of any value in Ceramic, POSCAP or Alum/Tantalum Electrolytic types may be placed in parallel to improve PSRR at higher
FN6660.1 March 22, 2010
Soft-Start Operation (Optional)
If the current limit for in-rush current is acceptable in the application, do not use this feature. The soft-start circuit controls the rate at which the output voltage comes up to regulation at power-up or LDO enable. A constant current charges an external soft-start capacitor. The external capacitor always gets discharged to ground pin potential at the beginning of start-up or enabling. The discharge rate is the RC time constant of RPD and CSS. See Figures 25 through 28 in the "Typical Operating Performance Curves" beginning on page 10. RPD is the ON-resistance of the pull down MOSFET, M8. RPD is 300 typically. The soft-start feature effectively reduces the in-rush current at power-up or LDO enable until VOUT reaches regulation. The in-rush current can be an issue for applications that require large, external bulk 12
ISL80102, ISL80103
frequencies and/or load transient AC output voltage tolerances. INPUT CAPACITOR The minimum input capacitor required for proper operation is 10F having a ceramic dielectric. This minimum capacitor must be connected to VIN and ground pins of the LDO with PCB traces no longer than 0.5cm. (Note 10)" on page 4. The power dissipation can be calculated by using Equation 3:
P D = ( V IN - V OUT ) x I OUT + V IN x I GND (EQ. 3)
The maximum allowable junction temperature, TJ(MAX) and the maximum expected ambient temperature, TA(MAX) will determine the maximum allowable power dissipation as shown in Equation 4:
P D ( MAX ) = ( T J ( MAX ) - T A ) JA (EQ. 4)
Phase Boost Capacitor (Optional)
The ISL80102 and ISL80103 are designed to be stable with 10F or larger ceramic capacitor. Applications using the ADJ versions, may see improved performance with the addition of a small ceramic capacitor CPB as shown in Figure 1 on page 3. The conditions where CPB may be beneficial are: (1) VOUT > 1.5V, (2) COUT = 10F, and (3) tight AC voltage regulation band. CPB introduces phase lead with the product of R3 and CPB that results in increasing the bandwidth of the LDO. Typical R3 x CPB should be 4s. CPB not recommended for VOUT < 1.5V.
Where JA is the junction-to-ambient thermal resistance. For safe operation, please make sure that power dissipation calculated in Equation 3, PD be less than the maximum allowable power dissipation PD(MAX). The DFN package uses the copper area on the PCB as a heat-sink. The EPAD of this package must be soldered to the copper plane (GND plane) for heat sinking. Figure 39 shows a curve for the JA of the DFN package for different copper area sizes.
46 44 JA, C/W 42 40 38 36 34
2 4 6 8 10 12 14 16 18 20 22 2 EPAD-MOUNT COPPER LAND AREA ON PCB, mm 24
Current Limit Protection
The ISL80102, ISL80103 family of LDOs incorporates protection against overcurrent due to short, overload condition applied to the output and the in-rush current that occurs at start-up. The LDO performs as a constant current source when the output current exceeds the current limit threshold noted in the "Electrical Specifications" table on page 4. If the short or overload condition is removed from VOUT, then the output returns to normal voltage mode regulation. In the event of an overload condition, the LDO might begin to cycle on and off due to the die temperature exceeding the thermal fault condition. The TO220/263 package will tolerate higher levels of power dissipation on the die which may never thermal cycle if the heatsink of this larger package can keep the die temperature below the specified typical thermal shutdown temperature.
FIGURE 39. 3mmx3mm-10 PIN DFN ON 4-LAYER PCB WITH THERMAL VIAS JA vs EPAD-MOUNT COPPER LAND AREA ON PCB
Thermal Fault Protection
In the event the die temperature exceeds typically +160C, then the output of the LDO will shut down until the die temperature can cool down to typically +145C. The level of power combined with the thermal impedance of the package (+48C/W for DFN) will determine if the junction temperature exceeds the thermal shutdown temperature.
Power Dissipation and Thermals
The junction temperature must not exceed the range specified in the "Recommended Operating Conditions
For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 13
FN6660.1 March 22, 2010
ISL80102, ISL80103
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest Rev. DATE 3/4/10 REVISION FN6660.1 CHANGE Corrected Features on page 1 as follows: -Changed bullet "* 185mV Dropout @ 3A, 125mV Dropout @ 2A" to "* Very Low 120mV Dropout at 3A" -Changed bullet "* 65dB Typical PSRR" to "* 62dB Typical PSRR" -Deleted 0.5% Initial VOUT Accuracy Modified Figure 1 and placed as Typical Application on Page 1. Moved Pinout to page 3 In "Block Diagram" on page 2, corrected resistor associated with M5 from R4 to R5 Updated Block Diagram on page 2 as follows" - Added M8 from SS to ground. Updated Figure 1 on page 3 as follows: -Corrected Pin 6 from SS to IRSET -Removed Note 12 callout "Minimum cap on VIN and VOUT required for stability." Added Note "*CSS is optional. See Note 12 on Page 5." and "** CPB is optional. See "Functional Description" on page 12 for more information." Added "The 1.5V, 3.3V and 5V fixed output voltages will be released in the future." to Note 3 on page 2. In "Thermal Information" on page 4, updated Theta JA from 45 to 48 per ASYD In "Soft-Start Operation (Optional)" on page 12: -Changed "The external capacitor always gets discharged to 0V at start-up of after coming out of a chip disable." to "The external capacitor always gets discharged to ground pin potential at start-up or enabling." -Changed "The soft-start function effectively limits the amount of in-rush current below the programmed current limit during start-up or an enable sequence to avoid an overcurrent fault condition." to "The soft-start feature effectively reduces the in-rush current at power-up or LDO enable until VOUT reaches regulation." -Added "See Figures 25 through 27 in the "Typical Operating Performance Curves" beginning on page 9." -Added "RPD is the on resistance of the pull down MOSFET, M8. RPD is 300Ohms typically." Added "Phase Boost Capacitor (CPB)" section on page 13. In "Typical Operating Performance" on page 11, revised figure "PSRR vs VIN" which had 3 curves with "Spectral Noise Density vs Frequency" which has one curve. Added "FIGURE 32. LOAD TRANSIENT 0A TO 3A, COUT = 10F CERAMIC, NO CPB (ADJ VERSION)" and "FIGURE 33. LOAD TRANSIENT 1A TO 3A, COUT = 10F CERAMIC, CPB = 1500pF (ADJ VERSION)" 09/30/09 FN6660.0 Initial Release.
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a complete list of Intersil product families. *For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on intersil.com: ISL80102, ISL80103 To report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff FITs are available from our website at http://rel.intersil.com/reports/search.php
ISL80102, ISL80103
Package Outline Drawing
L10.3x3
10 LEAD DUAL FLAT PACKAGE (DFN) Rev 6, 09/09
3.00 A B 1 6 PIN 1 INDEX AREA 2 2.00 8x 0.50 3.00 6 PIN #1 INDEX AREA
10 x 0.23
4
(4X)
0.10
1.60
TOP VIEW
10x 0.35 4 (4X) 0.10 M C A B
BOTTOM VIEW
0.415 0.23
PACKAGE OUTLINE (10x 0.23) 1.00 MAX
(10 x 0.55)
0.35
0.200
SEE DETAIL "X" 0.10 C C BASE PLANE 0.20 SIDE VIEW SEATING PLANE 0.08 C
(8x 0.50) C 1.60 0.05 TYPICAL RECOMMENDED LAND PATTERN DETAIL "X" NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. Unless otherwise specified, tolerance : Decimal 0.05 Lead width applies to the metallized terminal and is measured between 0.18mm and 0.30mm from the terminal tip. 5. 6. Tiebar shown (if present) is a non-functional feature. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be either a mold or mark feature. 0.20 REF 5
2.00
2. 3. 4.
15
FN6660.1 March 22, 2010

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