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ISL6550A, ISL6550C
FN9036.4
SAM (Supervisor And Monitor)
The ISL6550 is a precision, flexible, VID-code-controlled reference and voltage monitor for high-end microprocessor and memory power supplies. It monitors various input signals, and supervises the system (typically a DC/DC converter) with its output signals. See the Block Diagram for reference. The ISL6550 includes a 5-bit DAC (Digital-to-Analog Converter), which is programmed by the five VID inputs. The voltage range of the BDAC (Buffered DAC output) is determined by the DACHI and DACLO voltage levels, which are externally adjustable through the R1, R2, R3 resistor divider network. VREF5 is a precision-trimmed 5V reference, and is used to set the voltage at the top of the resistor divider. Programmable window comparators monitor Overvoltage (OV) and Undervoltage (UV) levels. The OVUVSEN input, usually coming from the associated power converter device is monitored and compared with BDAC; an error band is established via the R4 and R5 resistor setting on the OVUVTH pin. An optional external capacitor on the UVDLY pin gives a programmable delay on the UV. A high gain operational amplifier is available at pins VOPP, VOPM, and VOPOUT; it can be used as a gain stage to permit monitoring voltages that are different from the BDAC levels. The PEN (Power supply ENable) input, driven from an opencollector source, enables (when logic high) the external converter output, via the PGOOD or START outputs (both open-drain). They both basically indicate that the power supply is enabled (PEN = high) and there are no fault conditions. There are two logic options available, which determine the START and PGOOD states; see the block diagram or the Logic Options Table for more detail. The two logic options are identified with a suffix letter A or C in the ordering information.
Features
* 12V supply operation * 5V reference output * 5-bit digital-to-analog converter * Programmable DAC Range, within 0.8-5.0V * Programmable undervoltage and overvoltage thresholds, and latched fault detection * Optional delayed undervoltage (programmable with external capacitor) * Undervoltage lockout (power-on-reset) * Status Indicators (START, PGOOD) * Uncommitted operational amplifier * Compatible with ISL6551 full bridge controller * 20 Lead SOIC and 20 lead QFN (5x5) packages * QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
Applications
* Power Supplies for High End Microprocessors and Servers * Can be paired with the ISL6551 FBC for a complete fullbridge 48V-input converter, or used independently
Ordering Information
PART NUMBER ISL6550AIB ISL6550CIB ISL6550AIR ISL6550CIR TEMP. RANGE (C) -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE PKG. DWG. #
20 Lead SOIC M20.3 20 Lead SOIC M20.3 20 Lead QFN 20 Lead QFN L20.5x5 L20.5x5
NOTE: The same part numbers with a "-T" suffix are available as Tape and Reel.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2001, 2003-2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
ISL6550A, ISL6550C Pinouts
20 PIN WIDE BODY (SOIC) TOP VIEW
VCC VOPP VOPM VOPOUT VREF5 GND BDAC OVUVTH DACHI 1 2 3 4 5 6 7 8 9 20 UVDLY 19 OVUVSEN 18 PGOOD 17 START 16 PEN 15 VID0 14 VID1 13 VID2 12 VID3 11 VID4 PGOOD 5 6 OVUVSEN 7 UVDLY 8 VCC 9 VOPP 10 VOPM 11 VOPOUT VID0 PEN START 2 3 4 14 BDAC 13 GND 12 VREF5 VID1 1
20 PIN 5X5 (QFN) TOP VIEW
DACLO 17 DACHI 16 15 OVUVTH VID2 VID3 19 VID4 18
20
DACLO 10
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C Block Diagram
VREF5 5 OPAMP VOPM 3 VOPP 2 VOPOUT 4 PEN 16 + 5V VCC 1 BUFFERED 5V REF LOGIC BLOCK SEE OPTIONS A, C BELOW PEN: H = ENABLE; L = DISABLE RST 17 START ST
10A TO 5V
OVUVSEN 19 OV THRESHOLD PROGRAM
UVLOCKOUT (POR)
POR: H = VDD TOO LOW; L = VDD OK
OV: H = OVERVOLTAGE; L = OK UV
RPG 18 PGOOD PG
OVUVTH
8
UV: H = UNDERVOLTAGE; L = OK UVD: H = UV DELAY TIMED OUT; L = NO TIME-OUT
R1
UV/OV HYST: SEE NOTE BELOW DACHI 9 VID4 11 VID3 12 VID2 13 VID1 14 UVDELAY
(EACH VID PIN) 10A TO 5V
20 UVDLY (OPT) C1 DAC _BUFFER 7 BDAC
5-BIT DAC
R2
VID0 15 DACLO 10
R4 6 GND
R3
NOTE: Pin numbers shown are for the 20 lead SOIC package. Please check PINOUT diagrams for QFN pin numbers.
R5
A
NOTE: UV/OV Hysteresis = 10% POR OV UV UVD PEN R
PEN POR Q
C
ST NOTE: UV/OV Hysteresis = 10% POR PEN R
PEN POR Q
ST
S
Q Q: H = FAULT; L = NO FAULT UV UVD PEN PEN POR Q UV
OV
S
Q Q: H = FAULT; L = NO FAULT
FAULT LATCH
FAULT LATCH POR OV UV
PG NOTE: S input dominates Q
PG
NOTE: S input dominates Q
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C Pin Descriptions
NOTE: Pin numbers refer to the 20 lead SOIC package. Please check PINOUT diagrams for QFN pin numbers.
VCC (Positive Supply Voltage) Pin 1 - This power pin supplies power to the IC; nominally 12V. It should be bypassed directly to the GND pin with a 0.1F low ESR/ESL capacitor. GND (Signal Ground) Pin 6 - This power pin is the reference ground connection for the IC, and any circuitry that provides input/output to/from it. VID0-VID4 (DAC Digital Input Code Control) Pins 15-11 These are the DAC digital input control code lines. VID0 represents the least significant bit (LSB) and VID4 represents the most significant bit (MSB). Table 1 shows all of the codes, and their results. Note that setting all input codes low produces the maximum voltage at BDAC. The minimum voltage results when all codes are set high. Logic zero is considered system ground. A floated input or an input held higher than 2.0V is considered a logic one level. An internal 10A current source pulls open VID pins to a logic high (nominal 1.6V). The pins are also TTL and LVTTL compatible. PEN (Power Supply Enable) Pin 18 - This digital input pin enables the external converter through the START or PGOOD pins. A logic high (or float) enables the output voltage, and a logic low disables it. This pin has a 10A pullup current source, so it can interface with an open-collector or open-drain driver. When disabled, the START output is low and the PGOOD output is low. OVUVTH (Overvoltage/Undervoltage THreshold) Pin 8 This analog input pin is used to program the window thresholds for the OV and UV comparators. The OV-UV window is centered around the BDAC voltage and can be programmed from 5% to 40% about the BDAC voltage. This pin's voltage sets the undervoltage threshold. Internal circuitry sets the overvoltage threshold such that the two thresholds are centered about BDAC, the DAC output voltage. For example, if BDAC is 2.5V, and OVUVTH is 2.0V (0.5V below BDAC), then the internal OV threshold is 3.0V (0.5V above BDAC). OVUVSEN (Overvoltage/Undervoltage SENse) Pin 19 This analog input pin is the sense voltage for Undervoltage and Overvoltage purposes. A resistor divider from the BDAC output sets the UV level, on the OVTH/UVTH pin; the IC will internally mirror a similar voltage for OV, and then compare them both to the OVUVSEN input. DACHI (HIgh Limit of BDAC Voltage Range) Pin 9 - This analog input pin sets the high level of the BDAC, and is programmed through the external 3-resistor divider (R1, R2, R3) shown in the block diagram.
DACLO (LOw Limit of BDAC Voltage Range) Pin 10 This analog input pin sets the low level of the BDAC, and is programmed through the external 3-resistor divider shown in the block diagram.
NOTE: A total resistance of around 50K is optimal for R1, R2, and R3. Adjust the ratios of these resistors to get the desired DACHI and DACLO voltage levels.
UVDLY (Under Voltage Delay) Pin 20 - This is an analog input/output pin. When the Undervoltage threshold is exceeded, a potential fault is detected. A capacitor tied to the UVDLY pin is charged by an internal 10A source. The ramp time of the capacitor to the threshold voltage (5V nominal) determines the delay. (no capacitor gives essentially no delay). VOPP (Positive Opamp Input) Pin 2 - This analog input pin is the positive input of the Opamp. VOPM (Minus Opamp Input) Pin 3 - This analog input pin is the minus input of the Opamp. VOPOUT (Opamp Output) Pin 4 - This analog output pin is the output of the Opamp. BDAC (Buffered Digital-to-Analog Converter) Pin 7 - This analog output pin is the output of the 5-bit DAC. Setting all input codes low produces the maximum voltage at BDAC. The minimum voltage results when all codes are set high. See Table 1 for codes. VREF5 (5V Reference Voltage) Pin 5 - This is an analog output pin, which provides a precision reference voltage for setting DACHI and DACLO voltage levels. START Pin 17 - This is an open-drain pull-down digital output pin; it is pulled low when one or more of the monitored conditions is not valid; the output goes high impedance (to be pulled high externally through a pull-up resistor or equivalent) if all conditions are met. See Logic Options Table for the various conditions. PGOOD (Power Good) Pin 18 - This is an open-drain pulldown digital output pin; it is pulled low when one or more of the monitored conditions is not valid; the output goes high impedance (to be pulled high externally through a pull-up resistor or equivalent)) if all conditions are met. See Logic Options Table for the various conditions.
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+15V Input, Output or I/O Voltage . . . . . . . . . . . GND -0.3V to VCC +0.3V ESD Rating Human Body Model (Per MIL-STD-883 Method 3015.7) . . . . .3kV Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .200V
Thermal Information
Thermal Resistance JA (C/W) JC (C/W) SOIC Package (Typical, Note 1) . . . . . 65 N/A QFN Package (Typical, Note 2) . . . . . . 35 5 Maximum Junction Temperature (Plastic Package) . . 150 Maximum Storage Temperature Range . . . . . . . . . . . . -65 to 150 Maximum Lead Temperature (Soldering 10s) . . . . . . . 300 (SOIC - Lead Tips Only) For Recommended soldering conditions see Tech Brief TB389.
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +12V 10% Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to 85C Junction Temperature Range. . . . . . . . . . . . . . . . . . .-40C to 125C
.
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES: 1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 2. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. JC, the "case temp" is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications
PARAMETER SUPPLY CURRENT Input Current UNDERVOLTAGE LOCKOUT VCC UVLO Turn-on Threshold VCC UVLO Turn-off Threshold VCC UVLO Threshold Hysteresis DAC REFERENCE
TA = 25C, and VDD = 12V, unless otherwise specified SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
IIN
VCC = 12V
-
5
6
mA
9.2 8.2 -
9.4 8.4 1.0
9.9 8.9 -
-
DAC Output Error (See Notes 3, 4)
Step Size = 25mV Vdaclo = 0.8V to 4.225V Ibdac = 0.1mA to -1mA Step Size = 50mV Vdaclo = 0.8V to 3.45V Ibdac = 0.1mA to -1mA Step Size = 100mV Vdaclo = 0.8V to 1.9V Ibdac = 0.1mA to -1mA
-2
-
+2
mV
DAC Output Error (See Notes 3, 4)
-2
-
+4
mV
DAC Output Error (See Notes 3, 4)
-2
-
+6
mV
VREF5 Voltage VID0-VID4 Input LPUL (Vih) VID0-VID4 Input MPDL (Vil) VID0-VID4 Input Pull-Up Current VID0-VID4 Input Leakage Current Output Settling Time UVDLY Source Current Sink Current Threshold Vvidx = 0V Vvidx = 5V 1LSB Error Band
4.95 2.0 -15 -
-10 -
5.05 0.8 1 20
V V V mA A s
-
-10 10 5
-
A mA V
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C
Electrical Specifications
PARAMETER VOLTAGE AMPLIFIER Input Offset Voltage Input Bias Current Input Offset Current Open Loop Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Maximum Output Current Source Maximum Output Current Sink Slew Rate Phase Margin Input Common Mode Voltage Gain-Bandwidth Product MONITOR CIRCUITRY Input Common Mode Range Propagation Delay PGOOD, START Outputs PGOOD Voltage Low START Voltage Low Transistor Breakdown Voltage Transistor Leakage PEN Input LPUL (Vih) Input MPDL (Vil) Input Pull-Up Current Input Leakage Current OV/UV UV and OV Threshold Hysteresis NOTES: 3. The total resistance of R1 + R2 + R3 of 50k is preferred to minimize error due to DACHI and DACLO input currents. Choose the values within this limitation such that the voltages at DACHI and DACLO are those desired for the high and low limits of the programming range. For example, Choosing R1 and R2 to be 15K and R3 to be 20K will produce a DAC range of 2.0V to 3.5V. 4. DAC Output Error as defined here assumes that the voltages applied to DACHI and DACLO are exact. The limits include errors introduced by source impedance up to 12.5K and DACHI and DACLO. The error in Vdachi and Vdaclo (i.e. VREF5 error + external resistor divider error) must be included to arrive at the total BDAC output error. % of (Vbdac-Vovuvth); logic options A, C 10 % PEN = 0V PEN = 5V 2 -15 -10 0.8 1 V V A A IPGOOD = 5.0mA ISTART = 5.0mA All Conditions All Conditions 15 0.27 0.21 0.4 0.4 5 V V V A OV, UV Comparators OV, UV Comparators 0 6 1.0 V S All All Conditions All Conditions All Conditions All Conditions Vin ranges from 0V to 6V 1mA Load 2mA source or 0.2mA sink All All All 100pF load Condition 85 80 90 1 -2 0.2 4 0 7.4 20 -7 3 45 3.0 200 50 5 6 mV nA nA dB dB dB V mA mA v/s deg V MHz TA = 25C, and VDD = 12V, unless otherwise specified (Continued) SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C
TABLE 1. DIGITAL-TO-ANALOG (DAC) PROGRAMMING CODE VID4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 VID3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 VID0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Vdaclo Vdaclo + 1*Vstep Vdaclo + 2*Vstep Vdaclo + 3*Vstep Vdaclo + 4*Vstep Vdaclo + 5*Vstep Vdaclo + 6*Vstep Vdaclo + 7*Vstep Vdaclo + 8*Vstep Vdaclo + 9*Vstep Vdaclo + 10*Vstep Vdaclo + 11*Vstep Vdaclo + 12*Vstep Vdaclo + 13*Vstep Vdaclo + 14*Vstep Vdaclo + 15*Vstep Vdaclo + 16*Vstep Vdaclo + 17*Vstep Vdaclo + 18*Vstep Vdaclo + 19*Vstep Vdaclo + 20*Vstep Vdaclo + 21*Vstep Vdaclo + 22*Vstep Vdaclo + 23*Vstep Vdaclo + 24*Vstep Vdaclo + 25*Vstep Vdaclo + 26*Vstep Vdaclo + 27*Vstep Vdaclo + 28*Vstep Vdaclo + 29*Vstep Vdaclo + 30*Vstep Vdaclo + 31*Vstep = Vdachi DACOUT Vstep = (Vdachi-Vdaclo)/31
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C Logic Options
OPTION DEFINITIONS START Pin: PEN input is high AND VCC is above the UVLO threshold AND OV condition does not exist AND UVDLY condition does not exist. Fault Latch is not set. PGOOD Pin: VCC is above the UVLO threshold AND UV condition does not exist AND OV condition does not exist AND PEN input is high AND Fault latch is not set. Fault Latch Set by: OV condition OR UVDLY condition (UV has persisted past the UVDLY time-out) Fault Latch Reset by: OV condition does not exist AND UVDLY condition does not exist AND VCC below UVLO threshold OR PEN input low OVUV Detection: UV detect threshold = Vovuvth (voltage at OVUVTH pin) OV detect threshold = Vbdac + (Vbdac - Vovuvth) UV and OV threshold hysteresis = 10% of (Vbdac - Vovuvth) UV and OV threshold hysteresis = 40% of (Vbdac - Vovuvth) X X X X X X X X X X X X X X X X A X C X
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C Applications Information
Here are some step-by-step guidelines to help set up a circuit. Use the block diagram for reference. 1. Use a 12V (10%) Power Supply; connect to VCC and GND. Connect a 0.1F bypass capacitor across the pins. 2. Determine the minimum and maximum DAC values required. VREF5 is a precision 5V buffered output; connect R1, R2, R3 as a divider, to select the upper and lower range for the DAC. A total of 50k for the 3 resistors is recommended. The maximum for DACHI is 5.0V; the minimum for DACLO is 0.8V. The difference between DACHI and DACLO, divided by 31, determines the step size of the DAC. DACLO = (5V) * (R3)/(R1 + R2 + R3) DACHI = (5V) * (R3 + R2)/(R1 + R2 + R3) STEP = (DACHI - DACLO) / 31 For example, if R1 is 24K, R2 is 16K, and R3 is 10K, then DACLO = 1.0V, DACHI = 2.6V, and STEP = 0.05V 3. Within the above range, select the VID code for the desired BDAC output voltage. (This is typically used as a reference for a DC/DC converter system). Connect the VID bits accordingly (GND is a logic low; open/floating or 2V and above is a logic high). 4. Now that BDAC is set up as the desired reference voltage, the next step is to decide how far from this voltage the system voltage (typically the DC/DC converter output) is allowed to go, before shutting down the system. Select R4 and R5 to create the Undervoltage threshold. R4 + R5 should total around 50k, so as not to load the BDAC. OVUVTH = BDAC * (R5) / (R4 + R5). The threshold is a percentage of whatever the BDAC voltage is. If we define delta = (BDAC - OVUVTH), then the SAM will take that voltage, and mirror it up, to create an internal Overvoltage trip point of BDAC + delta, which is the same voltage above the BDAC that the UV trip point is below BDAC (the trip points are symmetrical by design). For example, if BDAC is 2.5V, R5 is 40K, and R4 is 10K, then OVUVTH = 2.0V. Since the UV threshold is 0.5V below BDAC, the internal OV threshold will be 0.5V above BDAC, or 3.0V. So, if during normal operation, the converter output voltage is pulled past either trip point, the START and PGOOD signals will change state, and can be used to shut down the converter. Note that there is also hysteresis for both trip points; it varies with each logic option; see Logic Options Table. If an opamp is needed to help condition or filter the input signal at OVUVSEN, the spare one can be used. It can also be used to change the gain, if the voltage to be compared is not equal to the BDAC voltage. And if the opamp is not needed here, it can still be used for any other purpose. There is an optional Undervoltage Delay circuit. This allows the system to ignore an excursion below the UV trip point for a short time period (for example, during a power-up sequence). When the UV trip point is exceeded, an external capacitor (C1 to GND) on the UVDLY pin gets charged through an internal 20A current source. If the OVUVSEN input is still below the trip point when the UVDLY pin reaches a nominal 5V, it will make the internal UVD signal a logic high, and the START or PGOOD will react accordingly. The delay time dt uses the formula I = C * dv/dt. In this case, dt = C1 * 5V/20A. Or solve for C1 = (20A) * (dt)/5V. Practical values for C range from 100pF (for 25s) up to 0.1F (for 25ms). 5. There is an UVLO (Undervoltage Lock-Out); also called POR (Power-On-Reset), so as not to be confused with the Undervoltage detection. This block monitors the VDD voltage; it releases around 9.4V as the power supply turns on, and has about 1.0V of hysteresis. This block only affects the START and PGOOD outputs. 6. The Logic block takes the various input and internal conditions (PEN, UV, OV, UVDLY, POR), and combines them logically to create the START and PGOOD outputs. These pins require some kind of external pull-up resistor (or equivalent); the pull-ups can be to the 12V supply, or any lower voltage compatible with the external logic. The value of the resistors depend on the pull-up voltage, the current desired, the logic voltage levels, rise or fall time considerations, etc.; A typical value would be 5k. The FAULT latch is set by a combination of input conditions; it is reset by POR or PEN (see Logic Options). The advantage of the latch is that a momentary fault can be saved, and the user must do something (power down or toggle PEN) to recover. But some users might call that same scenario a disadvantage. So there are two different logic options to choose from. Which one is best? Which logic signals should you use? It depends upon what's available in the system. The PEN input is useful, for example, because it can reset the FAULT latch of the C version; the A version requires the user to power down to reset. But does the system have a signal available to do that function? So part of the choice among the logic options is whether the system is smart enough to diagnose and correct a problem, or does it just shut everything down, and wait for help.
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C Small Outline Plastic Packages (SOIC)
N INDEX AREA H E -B1 2 3 SEATING PLANE -AD -CA h x 45o 0.25(0.010) M BM
M20.3 (JEDEC MS-013-AC ISSUE C) 20 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE
INCHES SYMBOL A A1 B MIN 0.0926 0.0040 0.014 0.0091 0.4961 0.2914 MAX 0.1043 0.0118 0.019 0.0125 0.5118 0.2992 MILLIMETERS MIN 2.35 0.10 0.35 0.23 12.60 7.40 MAX 2.65 0.30 0.49 0.32 13.00 7.60 NOTES 9 3 4 5 6 7 8o Rev. 1 1/02
L
C D E e H h
C
0.050 BSC 0.394 0.010 0.016 20 0o 8o 0.419 0.029 0.050
1.27 BSC 10.00 0.25 0.40 20 0o 10.65 0.75 1.27
e
B 0.25(0.010) M C AM BS

A1 0.10(0.004)
L N
NOTES: 1. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension "E" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. "L" is the length of terminal for soldering to a substrate. 7. "N" is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. The lead width "B", as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch) 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact.
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FN9036.4 January 18, 2005
ISL6550A, ISL6550C Quad Flat No-Lead Plastic Package (QFN) Micro Lead Frame Plastic Package (MLFP)
L20.5x5
20 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE MILLIMETERS SYMBOL A A1 A2 A3 b D D1 D2 E E1 E2 e k L N Nd Ne P 0.20 0.35 2.95 2.95 0.23 MIN 0.80 NOMINAL 0.90 0.02 0.65 0.20 REF 0.30 5.00 BSC 4.75 BSC 3.10 5.00 BSC 4.75 BSC 3.10 0.65 BSC 0.60 20 5 5 0.60 12 0.75 3.25 3.25 0.38 MAX 1.00 0.05 1.00 NOTES 9 9 5, 8 9 7, 8 9 7, 8 8 2 3 3 9 9 Rev. 4 11/04 NOTES: 1. Dimensioning and tolerancing conform to ASME Y14.5-1994. 2. N is the number of terminals. 3. Nd and Ne refer to the number of terminals on each D and E. 4. All dimensions are in millimeters. Angles are in degrees. 5. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. 7. Dimensions D2 and E2 are for the exposed pads which provide improved electrical and thermal performance. 8. Nominal dimensions are provided to assist with PCB Land Pattern Design efforts, see Intersil Technical Brief TB389. 9. Features and dimensions A2, A3, D1, E1, P & are present when Anvil singulation method is used and not present for saw singulation. 10. Compliant to JEDEC MO-220VHHC Issue I except for the "b" dimension.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed 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 11
FN9036.4 January 18, 2005

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