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ISL6425
Data Sheet February 8, 2005 FN9176.1
Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-top Box Designs
The ISL6425 is a highly integrated solution for supplying power and control signals from advanced satellite set-top box (STB) modules to the low noise block (LNB). This device is comprised of a current-mode boost PWM and a low-noise linear regulator, along with the circuitry required for I2C device interfacing and for providing DiSEqC standard control signals to the LNB. A regulated output voltage is available at the output terminal (VOUT) to support the operation of the antenna port in advanced satellite STB applications. The regulated output may be set to either 13V or 18V by use of the voltage select command (VSEL) through the I2C bus. Additionally, to compensate for the voltage drop in the coaxial cable, the voltage may be increased by 1V with the line length compensation (LLC) feature. An enable command sent on the I2C bus provides standby mode control for the PWM and linear combination, disabling the output to conserve power. A current-mode boost converter provides the linear regulator with an input voltage that is set to the required output voltage, plus 1.2V (typ.) to insure minimum power dissipation. This maintains a constant voltage drop across the linear pass element, while permitting an adequate voltage range for tone injection. The device is capable of providing 750mA (typ.).
Features
* Switch-Mode Power Converter for Lowest Dissipation - Boost PWM with >92% Efficiency - Selectable 13V or 18V Outputs - Digital Cable Length Compensation (1V) * External Pin to Select 13V/18V Options * DSQIN and SEL18V pins are 2.5V logic compatible * I2C Compatible Interface for Remote Device Control - Registered Slave Address 0001 00XX - Fully Functional 3.3V, 5V Operation up to 400kHz * Built-In Tone Oscillator Factory Trimmed to 22kHz - Facilitates DiSEqC (EUTELSAT) Encoding * Internal Over-Temperature Protection and Diagnostics * Internal Overload and Overtemp Flags (Visible on I2C) * LNB Short-Circuit Protection and Diagnostics * QFN Package - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline - Near Chip-Scale Package Footprint * Pb-free available (RoHS Compliant)
Applications
* LNB Power Supply and Control for Satellite Set-Top Box
Ordering Information
PART NUMBER ISL6425ER ISL6425ER-T ISL6425ERZ (Note) ISL6425ERZ-T (Note) TEMP. RANGE (C) -20 to 85 PACKAGE PKG. DWG. #
References
* Tech Brief 389 (TB389) - "PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages"; Available on the Intersil website, www.intersil.com
32 Ld 5x5 QFN L32.5x5 L32.5x5
32 Ld 5x5 QFN Tape and Reel -20 to 85
32 Ld 5x5 QFN L32.5x5 (Pb-free) L32.5x5
32 Ld 5x5 QFN Tape and Reel (Pb-free)
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are 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.
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 trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2004-2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6425 Pinout
ISL6425 (32 LEAD 5x5 QFN) TOP VIEW
CPVOUT 26 CPSWIN 25 24 CPSWOUT 23 NC 22 NC 21 NC 20 AGND 19 VOUT 18 DSQIN 17 TCAP 9 CS 10 FB 11 COMP 12 VSW 13 NC 14 SDA 15 ADDR 16 SCL
32 PGND NC SGND SEL18V NC BYPASS PGND GATE 1 2 3 4 5 6 7 8
31
30
29
28
2
VCC 27
NC
NC
NC
NC
NC
FN9176.1 February 8, 2005
Typical Application Schematic
VIN C17 47nF
C16 1uF 32 31 30 29 28 27 26 25
0
C18 1n
0
2 L2 33uH
C6 56uF
0 0 0
Q2 FDS6612A R6 18 R5 100 C8 1uF
0
1 2 3 4 5 6 7 8
NC NC NC NC NC VCC CPVOUT CPSWIN
CS FB COMP VSW NC SDA ADDR SCL
9 10 11 12 13 14 15 16
3
PGND NC SGND SEL18V NC BYP PGND GATE 1 5 6 7 8 4 3 2 1 R2 0.1 C2 100pF C9 1.5n C10 C14 10uF C15 10uF
U1 ISL6425ER
CPSWOUT NC NC NC AGND VOUT DSQIN TCAP
24 23 22 21 20 19 18 17
0
D3 STPS2L40U C20 0.22uF C22 0.1uF
VLNB1
0
0
0
ISL6425
DSQIN1 R10 R8 68K 33p R11 1k 1k SCL SDA
0
D2 STPS2L40U C4 56uF C13 10uF 1
0
L3 4.7uH 2
0
D5 STPS2L40U R13 100k
SEL18V1
0
0
0
0 0
FN9176.1 February 8, 2005
Block Diagram
7 OLF COUNTER OVERCURRENT PROTECTION LOGIC SCHEME 1 PWM LOGIC Q S CLK OLF E PAD PGND ISEL EN ENT CS AMP ILIM OTF + LLC SDA ADDR SDA ADDR SCL 15 16 17 DCL OC SEL18V
10
GATE
12
FB VREF
14
VSW
20
VOUT
28
VCC SGND
ON CHIP LINEAR UVLO POR SOFT-START BYPASS INT 5V EN TCAP SOFT-START AGND CHARGE PUMP CPSWOUT CPVOUT 27
6
9
-
+
4
11 CS
I2C INTERFACE
VSEL CLK
SCL DCL
SLOPE COMPENSATION BAND GAP REF VOLTAGE BGV REF VOLTAGE ADJ TONE INJ CKT
OSC. 220kHz
13
COMP
/ 10 AND WAVE SHAPING
22kHz TONE
ISL6425
ENT DSQIN 19
+ OTF THERMAL SHUTDOWN
CPSWIN
26
FN9176.1 February 8, 2005
21
18
25
ISL6425
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 18.0V Logic Input Voltage Range (SDA, SCL, ENT, DSQIN, SEL18V) . . . . . . . . . . . . . . -0.5V to 7V Output Current . . . . . . . . . . . . . . . . . . . . Externally/Internally Limited
Thermal Information
Thermal Resistance JA (C/W) JC (C/W) QFN Package (Notes 1, 2) . . . . . . . . 32 4 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150C Maximum Storage Temperature Range . . . . . . . . . . . -40C to 150C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300C NOTE: The device junction temperature should be kept below 150C. Thermal shut-down circuitry turns off the device if junction temperature exceeds +150C typically.
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 in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 2. For JC, the "case temperature" location is the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications
VCC = 12V, TA = -20C to +85C, unless otherwise noted. Typical values are at TA = 25C. EN = H, LLC = L, ENT = L, DCL = L, DSQIN = L, IOUT = 12mA, unless otherwise noted. See software description section for I2C access to the system. SYMBOL TEST CONDITIONS MIN 8 EN = L IIN EN = LLC = VSEL = ENT = H, No Load TYP 12 1.5 4.0 MAX 14 3.0 8.0 UNITS V mA mA
PARAMETER Operating Supply Voltage Range Standby Supply Current Supply Current UNDERVOLTAGE LOCKOUT Start Threshold Stop Threshold Start to Stop Hysteresis SOFT-START COMP Rise Time (Note 2) OUTPUT VOLTAGE Output Voltage (Note 3)
7.5 7.0 350
400
7.95 7.55 500
V V mV
(Note 4)
-
1024
-
Cycles
VOUT VOUT VOUT VOOU
VSEL = L, LLC = L VSEL = L, LLC = H VSEL = H, LLC = L VSEL = H, LLC = H VIN = 8V to 14V; VOUT = 13V VIN = 8V to 14V; VOUT = 18V
12.74 13.72 17.64 18.62 425 775 -
13.0 14.0 18.0 19.0 4.0 4.0 50 900 20
13.26 14.28 18.36 19.38 40.0 60.0 80 550 950 -
V V V V mV mV mV mA mA ms ms
Line Regulation
DVOUT
Load Regulation Dynamic Output Current Limiting
DVOUT IMAX
IO = 12mA to 450mA DCL = L, ISEL = L DCL = L, ISEL = H
Dynamic Overload Protection Off Time Dynamic Overload Protection On Time 22kHz TONE Tone Frequency Tone Amplitude Tone Duty Cycle Tone Rise or Fall Time
TOFF TON
DCL = L, Output Shorted (Note 4)
ftone Vtone dctone Tr, Tf
ENT = H ENT = H ENT = H (Note 5) ENT = H
20.0 550 40 5
22.0 680 50 8
24.0 900 60 14
kHz mV % s
5
FN9176.1 February 8, 2005
ISL6425
Electrical Specifications
VCC = 12V, TA = -20C to +85C, unless otherwise noted. Typical values are at TA = 25C. EN = H, LLC = L, ENT = L, DCL = L, DSQIN = L, IOUT = 12mA, unless otherwise noted. See software description section for I2C access to the system. (Continued) SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
PARAMETER LINEAR REGULATOR Drop-Out Voltage DSQIN, SEL18V INPUT PINs (Note 6) Asserted Low Asserted HIGH Input Current CURRENT SENSE Input Bias Current Overcurrent Threshold ERROR AMPLIFIER Open Loop Voltage Gain Gain Bandwidth Product PWM Maximum Duty Cycle Minimum Pulse Width OSCILLATOR Oscillator Frequency THERMAL PROTECTION Thermal Shutdown Temperature Shutdown Threshold Temperature Shutdown Hysteresis NOTES: 3. Internal Digital Soft-start
Iout = 450mA (Note 4)
-
1.2
-
V
1.7 -
1
0.8 -
V V A
IBIAS Static current mode, DCL = H
325
700 400
500
nA mV
AOL
GBP
(Note 4) (Note 4)
70 10
88 -
-
dB MHz
90 (Note 4) -
93 20
-
% ns
fo
Fixed at (10)(ftone)
200
220
240
kHz
(Note 4) (Note 4)
-
150 20
-
4. Voltage programming signals VSEL and LLC are implemented via the I2C bus. IO = 450mA. 5. Guaranteed by Design. 6. Unused DSQIN pin should be connected to GND. SEL18V pins is internally connected to GND by a 200K resistor.
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FN9176.1 February 8, 2005
ISL6425 Functional Pin Description
SYMBOL SDA SCL VSW PGND CS SGND AGND TCAP BYPASS DSQIN VCC GATE VOUT ADDR COMP FB Bidirectional data from/to I2C bus. Clock from I2C bus. Input of the linear post-regulator. Dedicated ground for the output gate driver of the PWM. Current sense input; connect Rsc at this pin for desired overcurrent value for the PWM. Small signal ground for the IC. Analog ground for the IC. Capacitor for setting rise and fall time of the output of the LNB. Use a capacitor value of 1F or higher. Bypass capacitor for internal 5V. When HIGH this pin enables the internal 22kHz modulation for the LNB, Use this pin for tone enable function for the LNB. Main power supply to the chip. This is the device output of the PWM. This high current driver output is capable of driving the gate of a power FET. This output is actively held low when Vcc is below the UVLO threshold. Output voltage for the LNB. Address pin to select two different addresses per voltage level at this pin. Error amp output used for compensation. Feedback pin for the PWM. FUNCTION
CPVOUT, CPSWIN, CPSWOUT Charge pump connections. SEL18V When connected HIGH, this pin will change the output of the PWM to 18V.
Functional Description
The ISL6425 single output voltage regulator makes an ideal choice for advanced satellite set-top box and personal video recorder applications. Both supply and control voltage outputs for a low noise block (LNB) are available simultaneously in any output configuration. The device utilizes a built-in DC/DC step-converter that, from a single supply source ranging from 8V to 14V, generates the voltage that enables the linear post-regulator to work with a minimum of dissipated power. An undervoltage lockout circuit disables the circuit when VCC drops below a fixed threshold (7.5V typ).
modulating the dc output with a 0.3V, 22kHz, symmetrical waveform. The presence of this signal usually gives the LNB information about the band to be received. Burst coding of the 22kHz tone can be accomplished due to the fast response of the DSQIN input and rapid tone response. This allows implementation of the DiSEqC (EUTELSAT) protocols. When the ENT bit is set HIGH, a continuous 22kHz tone is generated regardless of the DSQIN pin logic status. The ENT bit must be set LOW when the DSQIN pin is used for DiSEqC encoding.
DiSEqC Encoding
The internal oscillator is factory-trimmed to provide a tone of 22kHz in accordance with DISeqC standards. No further adjustment is required. The 22kHz oscillator can be controlled either by the I2C interface (ENT bit) or by a dedicated pin (DSQIN) that allows immediate DiSEqC data encoding for the LNB. All the functions of this IC are controlled via the I2C bus by writing to the system registers (SR). The same registers can be read back, and two bits will report the diagnostic status. The internal oscillator operates the converters at ten times the tone frequency. The device offers full I2C compatible functionality, 3.3V or 5V, and up to 400kHz operation. If the Tone Enable (ENT) bit is set LOW through I2C, then the DSQIN terminal activates the internal tone signal, 7
Linear Regulator
The output linear regulator will sink and source current. This feature allows full modulation capability into capacitive loads as high as 0.25F. In order to minimize the power dissipation, the output voltage of the internal step-up converter is adjusted to allow the linear regulator to work at minimum dropout. When the device is put in the shutdown mode (EN = LOW), the PWM power block is disabled. When the regulator block is active (EN = HIGH), the output can be logic controlled to be 13V or 18V (typical) by means of the VSEL bit (Voltage Select) for remote controlling of non-DiSEqC LNBs. Additionally, it is possible to increment by 1V (typical) the selected voltage value to compensate for the excess voltage drop along the coaxial cable (LLC bit HIGH).
FN9176.1 February 8, 2005
ISL6425
Output Timing
The programmed output voltage rise and fall times can be set by an external capacitor. The output rise and fall times will be approximately 3400 times the TCAP value. For the recommended range of 0.47F to 2.2F, the rise and fall time would be 1.6ms to 7.6ms. Using a 0.47F capacitor insures the PWM stays below its overcurrent threshold when charging a 120F VSW filter cap during the worst case 13V to 19V transition. A typical value of 1.0F is recommended. This feature affects the programmed voltage rise and fall times. independent 13V/18V output voltage selection. When using this pin, the I2C bits should be initialized to 13V status.
TABLE 1. I2C BITS 13V 13V SEL18V Low High O/P VOLTAGE 13V 18V
I2C Bus Interface for ISL6425
(Refer to Philips I2C Specification, Rev. 2.1) Data transmission from main microprocessor to the ISL6425 and vice versa takes place through the 2 wire I2C bus interfaces, consisting of the two lines SDA and SCL. Both SDA and SCL are bidirectional lines, connected to a positive supply voltage via a pull up resistor. (Pull up resistors to positive supply voltage must be externally connected). When the bus is free, both lines are HIGH. The output stage of ISL6425 will have an open drain/open collector in order to perform the wired-AND function. Data on the I2C bus can be transferred up to 100kbits/s in the standard-mode or up to 400kbits/s in the fast-mode. The level of logic "0" and logic "1" is dependent of associated value of Vdd as per electrical specification table. One clock pulse is generated for each data bit transferred.
Current Limiting (Only one ISEL option needed)
The current limiting block can operate either statically (simple current clamp) or dynamically. The lower threshold is between 425mA and 550mA (ISEL = L), while the higher threshold is between 775mA and 950mA (ISEL = H). When the DCL (Dynamic Current Limiting) bit is set to LOW, the overcurrent protection circuit works dynamically. That is, as soon as an overload is detected, the output is shutdown for a time tOFF, typically 900ms. Simultaneously the overload flag (OLF) bit of the system register is set to HIGH. After this time has elapsed, the output is resumed for a time Ton = 20ms. During Ton, the device output will be current limited to between 575mA and 950mA. At the end of Ton, if the overload is still detected, the protection circuit will cycle again through Toff and Ton. At the end of a full Ton during which no overload is detected, normal operation is resumed and the OLF bit is reset to LOW. Typical Ton+Toff time is 920ms as determined by an internal timer. This dynamic operation can greatly reduce the power dissipation in a short circuit condition, still ensuring excellent power-on start-up in most conditions. However, there could be some cases in which a highly capacitive load on the output may cause a difficult start-up, when the dynamic protection is chosen. This can be solved by initiating a power start-up in static mode (DCL = HIGH) and then switching to the dynamic mode (DCL = LOW) after a chosen amount of time. When in static mode, the OLF bit goes HIGH when the current limit threshold at the CS pin reaches 0.45V typ and returns LOW when the overload condition is cleared. The OLF bit will be LOW at the end of initial power-on soft-start.
Data Validity
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the data line can only change when the clock signal on the SCL line is LOW. (Refer to Figure 1.)
SDA
SCL DATA LINE CHANGE STABLE OF DATA DATA VALID ALLOWED
FIGURE 1. DATA VALIDITY
START and STOP Conditions
As shown in the Figure 2, START condition is a HIGH to LOW transition of the SDA line, while SCL is HIGH. The STOP condition is a LOW to HIGH transition on the SDA line, while SCL is HIGH. A STOP condition must be sent before each START condition.
Thermal Resistance
This IC is protected against overheating. When the junction temperature exceeds 150C (typical), the step-up converter and the linear regulator are shut off and the overtemp flag (OTF) bit of the SR is set HIGH. Normal operation is resumed and the OTF bit is reset LOW, when the junction is cooled down to 130C (typical).
External Output Voltage Selection
The output voltage can be selected by the I2C bus. Additionally, the QFN package offers a pin (SEL18V) for
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FN9176.1 February 8, 2005
ISL6425
Transmission Without Acknowledge
SDA
SCL S START CONDITION P STOP CONDITION
Avoiding detection of the acknowledgement, the microprocessor can use a simpler transmission; it waits one clock without checking the slave acknowledging, and sends the new data. This approach, though, is less protected from error and decreases the noise immunity.
FIGURE 2. START AND STOP WAVEFORMS
ISL6425 Software Description
Interface Protocol
The interface protocol is comprised of the following, as shown below in Table 2: * A start condition (S) * A chip address byte (MSB on left; the LSB bit determines read (1) or write (0) transmission) (the assigned I2C slave address for the ISL6425 is 0001 00XX) * A sequence of data (1 byte + Acknowledge) * A stop condition (P)
TABLE 2. INTERFACE PROTOCOL S 0 0 0 1 0 0 0 R/W ACK Data (8 bits) ACK P
Byte Format
Every byte put on the SDA line must be 8 bits long. The number of bytes that can be transmitted per transfer is unrestricted. Each byte has to be followed by an acknowledge bit. Data is transferred with the most significant bit first (MSB).
Acknowledge
The master (microprocessor) puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (Figure 3). The peripheral that acknowledges has to pull down (LOW) the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during this clock pulse. (Of course, set-up and hold times must also be taken into account.) The peripheral which has been addressed has to generate an acknowledge after the reception of each byte, otherwise the SDA line remains at the HIGH level during the ninth clock pulse time. In this case, the master transmitter can generate the STOP information in order to abort the transfer. The ISL6425 will not generate the acknowledge if the POWER OK signal from the UVLO is LOW.
SCL 1 SDA MSB START ACKNOWLEDGE FROM SLAVE 2 8 9
Transmitted Data (I2C bus WRITE mode)
When the R/W bit in the chip is set to 0, the main microprocessor can write on the system register (SR1) of the ISL6425 via I2C bus. These will be written by the microprocessor as shown below.
FIGURE 3. ACKNOWLEDGE ON THE I2C BUS
TABLE 3. SYSTEM REGISTER 1 (SR1) R, W SR1 R, W DCL R, W X R, W ENT1 R, W LLC1 R, W VSEL1 R, W EN1 R OLF1
TABLE 4. SYSTEM REGISTER 2 (SR2) R, W SR2 System Register Format * R, W = Read and Write bit * R = Read-only bit All bits reset to 0 at Power-On R, W X R, W X R, W X R, W X R, W EN2 R OTF R X
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FN9176.1 February 8, 2005
ISL6425
TABLE 5. SYSTEM REGISTER (SR1 AND SR2) CONFIGURATION SR1 0 0 0 0 0 0 0 0 0 0 0 0 DCL X X X X X X X X X 1 0 X ISEL1 X X X X X X X 0 1 X X X ENT1 X X X X X 0 1 X X X X X LLC1 0 0 0 1 1 X X X X X X X VSEL1 0 0 1 0 1 X X X X X X X EN1 X 1 1 1 1 1 1 1 1 1 1 0 OLF1 X X X X X X X X X X X X SR1 is selected Vout1 = 13V, Vboost1 = 13V + Vdrop Vout1 = 18V, Vboost1 = 18V + Vdrop Vout1 = 14V, Vboost1 = 14V + Vdrop Vout1 = 19V, Vboost1 = 19V + Vdrop 22kHz tone is controlled by the DSQIN pin 22kHz tone is ON, the DSQIN input is disabled Iout1 = 425mA max. Iout1 = 775mA max. Dynamic current limit NOT selected Dynamic current limit selected PWM and Linear for channel 1 disabled FUNCTION
SR2 1
X
X
X
X
EN2 0
OTF X
X
FUNCTION SR2 is selected; to read OTF flag.
NOTE: OTF is a "Read Only" bit and X indicates a "Don't Care" condition for the function specified.
Received Data (I2C Bus Read Mode)
The ISL6425 can provide to the master a copy of the System Register information via the I2C bus in read mode. The read mode is Master activated by sending the chip address with R/W bit set to 1. At the following Master generated clock bits, the ISL6425 issues a byte on the SDA data bus line (MSB transmitted first). At the ninth clock bit the MCU master can: * Acknowledge the reception, starting in this way the transmission of another byte from the ISL6425. * Not acknowledge, stopping the read mode communication. While the whole register is read back by the microprocessor, only the two read-only bits, OLF and OTF, convey diagnostic information about the ISL6425.
TABLE 6. READING SYSTEM REGISTERS DCL ISEL ENT LLC VSEL EN OTF OLF These bits are read as they were after the last write operation. 0 1 0 1 FUNCTION Tj 130C, Normal operation Tj > 150C, Power blocks disabled Iout < Imax, Normal operation Iout > Imax, Overload protection triggered
Power-On I2C Interface Reset
The I2C interface built into the ISL6425 is automatically reset at power-on. The I2C interface block will receive a Power OK logic signal from the UVLO circuit. This signal will go HIGH when chip power is OK. As long as this signal is LOW, the interface will not respond to any I2C commands and the system register SR is initialized to all zeros, thus keeping the power blocks disabled.
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FN9176.1 February 8, 2005
ISL6425
Once Vcc rises above the UVLO level, the POWER OK signal given to the I2C interface block will be HIGH, the I2C interface becomes operative and the SR can be configured by the main microprocessor. About 400mV of hysteresis is provided in the UVLO threshold to avoid false triggering of the Power-On reset circuit. (I2C comes up with EN = 0, EN goes HIGH at the same time as (or later than) all other I2C data for the PWM becomes valid).
I2C Electrical Characteristics
TABLE 8. I2C SPECIFICATIONS PARAMETER TEST CONDITION MIN TYP 0.7 x VDD 0.3 x VDD 10A 0 100kHz 400kHz MAX
Input Logic High, SDA, SCL VIH Input Logic Low, SDA, SCL VIL Input Logic Current, IIL SCL Clock Frequency SDA, SCL; 0.4V < Vin < 4.5V
ADDRESS Pin
Connecting this pin to GND forces the chip I2C interface address to 0001000; applying a voltage >2.7V forces the address to 0001001, as shown below.
TABLE 7. ADDRESS PIN CHARACTERISTICS VADDR Vaddr-1 "0001000" Vaddr-2 "0001001" MIN 0V 2.7V TYP MAX 2.0V 5.0V
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FN9176.1 February 8, 2005
ISL6425 Quad Flat No-Lead Plastic Package (QFN) Micro Lead Frame Plastic Package (MLFP)
L32.5x5
32 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VHHD-2 ISSUE C MILLIMETERS SYMBOL A A1 A2 A3 b D D1 D2 E E1 E2 e k L L1 N Nd Ne P 8 0.25 0.30 2.95 2.95 0.18 MIN 0.80 NOMINAL 0.90 0.20 REF 0.23 5.00 BSC 4.75 BSC 3.10 5.00 BSC 4.75 BSC 3.10 0.50 BSC 0.40 32 8 8 0.60 12 0.50 0.15 3.25 3.25 0.30 MAX 1.00 0.05 1.00 NOTES 9 9 5,8 9 7,8 9 7,8 8 10 2 3 3 9 9 Rev. 1 10/02 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. Depending on the method of lead termination at the edge of the package, a maximum 0.15mm pull back (L1) maybe present. L minus L1 to be equal to or greater than 0.3mm.
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 12
FN9176.1 February 8, 2005

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