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19-0532; Rev 0; 5/06
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator
General Description
The MAX16803 current regulator operates from a 6.5V to 40V input-voltage range and delivers up to a total of 350mA to one or more strings of high-brightness LEDs (HB LEDs). The output current of the MAX16803 is adjusted by using an external current-sense resistor in series with the LEDs. A dimming input allows widerange "pulsed" PWM operation. Wave-shaping circuitry reduces EMI. The differential current-sense input increases noise immunity. The MAX16803 is well suited for applications requiring high-voltage input and is able to withstand automotive load-dump events up to 40V. An on-board pass element minimizes external components while providing 3.5% output-current accuracy. Additional features include a 5V regulated output and short-circuit and thermal protection. The MAX16803 is available in a thermally enhanced, 5mm x 5mm, 16-pin TQFN package and is specified over the automotive -40C to +125C temperature range.
Features
+6.5V to +40V Operating Range Adjustable LED Current (35mA to 350mA) 3.5% LED Current Accuracy High-Voltage DIM Pin for Dimming Interface Integrated Pass Element with Low-Dropout Voltage (0.5V typ) +5V Regulated Output with 4mA Source Capability Parallel Operation for LED Current > 350mA Differential LED Current Sense Low Shutdown Supply Current (12A typ) Low 204mV Current-Sense Reference Reduces Power Losses Wave-Shaped Edges Reduce Radiated EMI During PWM Dimming Thermal Shutdown Output Short-Circuit Protection Available in Small, Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN Package -40C to +125C Operating Temperature Range
MAX16803
Applications
Automotive Interior: Map, Courtesy, and Cluster Lighting Automotive Exterior: Rear Combination Lights (RCLs) Emergency Vehicle Warning Lights Navigation and Marine Indicators General Lighting Signage, Gasoline Canopies, Beacons
Ordering Information
PART MAX16803ATE+ TEMP RANGE PINPACKAGE PKG CODE T1655-3
-40C to +125C 16 TQFN-EP*
+Denotes lead-free package. *EP = Exposed pad.
Pin Configuration
GND CS+ V5 CS-
Simplified Diagram
TOP VIEW
12
11
10
9
+6.5V TO +40V IN 0.1F N.C. N.C. N.C. N.C. OUT +5V REG V5 0.1F LEDs
DIM 13 N.C. 14 EN 15 OUT 16
8 7
EN
MAX16803
CS+
MAX16803 +
1 OUT 2 IN 3 IN 4 N.C.
6 5
PWM DIMMING DIM GND CS-
RSENSE
TQFN ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
ABSOLUTE MAXIMUM RATINGS
IN, OUT, DIM, and EN to GND ...............................-0.3V to +45V CS+, CS-, V5 to GND ...............................................-0.3V to +6V OUT Short Circuited to GND Duration (at VIN = +16V) ........................................................60 minutes Maximum Current Into Any Pin (except IN and OUT).........20mA Continuous Power Dissipation (TA = +70C) 16-Pin TQFN (derate 33.3mW/C above +70C) ......2666.7mW Operating Junction Temperature Range ...........-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VEN = +12V, CV5 = 0.1F to GND, IV5 = 0, VCS- = 0V, VDIM = +4V, connect RSENSE = 0.58 between CS+ and CS- (Note 1). TJ = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Ground Current Shutdown Supply Current Guaranteed Output Current Output Current Accuracy SYMBOL VIN IG ISHDN IOUT (Note 2) ILOAD = 350mA EN 0.6V RSENSE = 0.55 35mA < IOUT < 350mA IOUT = 350mA (current pulsed), 12V < VIN < 40V IOUT = 350mA (current pulsed), 6.5V < VIN < 12V Current rising, DIM rising to 4V Current falling, DIM falling to 0.6V VOUT = 0V, VIN = 12V IEN VIH VIL tON VRSNS EN rising edge to 90% of OUT VSENSE = VCS+ - VCSVCS+ = 220mV VCS+ = 220mV VIH VIL tON tOFF After DIM rising to 4V (Note 5) After DIM falling to 0.6V (Note 5) -84 1 4 0.6 52 38 196 -0.3 80 203 210 +4.1 +14 2.8 0.6 400 350 3.5 0.5 0.5 17 17 600 800 100 1.2 V 1.5 mA/s mA nA V V s mV V A A A V V s s CONDITIONS MIN 6.5 1.4 12 TYP MAX 40.0 3 40 UNITS V mA A mA %
Dropout Voltage (Note 3)
VDO
Output Current Slew Rate Short-Circuit Current LOGIC INPUT EN Input Current EN Input Voltage High EN Input Voltage Low Turn-On Time CURRENT SENSE (Note 4) Regulated RSENSE Voltage CS- Voltage Range Input Current (CS+) Input Current (CS-) DIM Input Current DIM Input Voltage High DIM Input Voltage Low Turn-On Time Turn-Off Time
2
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VEN = +12V, CV5 = 0.1F to GND, IV5 = 0, VCS- = 0V, VDIM = +4V, connect RSENSE = 0.58 between CS+ and CS- (Note 1). TJ = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER THERMAL OVERLOAD Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis +5V REGULATOR Output Voltage Regulation V5 Short-Circuit Current V5 (Note 6) V5 = 0V (Note 7) 5.0 5.27 16 5.5 V mA +155 23 C C SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX16803
Note 1: All devices 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design. Note 2: Resistors were added from OUT to CS+ to aid with the power dissipation during testing. Note 3: Dropout is measured as follows: Connect RO = 27 from OUT to CS+. Connect RSENSE = 0.58 from CS+ to CS-. Set VIN = +12V (record VOUT as VOUT1). Reduce VIN until VOUT = 0.97 x VOUT1 (record as VIN2 and VOUT2). VDO = VIN2 - VOUT2. Note 4: IV5 = 0mA. Note 5: tON time includes the delay and the rise time needed for IOUT to reach 90% of its final value. tOFF time is the time needed for IOUT to drop below 10%. See the Typical Operating Characteristics. tON and tOFF are tested with 13 from OUT to CST. Note 6: Current regulation varies with V5 load (see the Typical Operating Characteristics). Note 7: Thermal shutdown does not function if the output of the 5V reference is shorted to ground.
Typical Operating Characteristics
(VIN = VEN = +12V, TA = +25C, unless otherwise noted.)
OUTPUT CURRENT vs. TEMPERATURE
MAX16803 toc01
(VCS+ - VCS-) vs. OUTPUT CURRENT
MAX16803 toc02
OUTPUT CURRENT vs. INPUT VOLTAGE
350 OUTPUT CURRENT (mA) 300 250 200 150 100 50 0
MAX16803 toc03
450 400 OUTPUT CURRENT (mA) 350 300 250 200 150 100 50 0 ILOAD = 35mA ILOAD = 100mA ILOAD = 200mA ILOAD = 350mA
0.210 0.209 0.208 (VCS+ - VCS-) (V) 0.207 0.206 0.205 0.204 0.203 0.202 0.201 0.200 VIN = 12V
400
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
20 50 80 110 140 170 200 230 260 290 320 350 OUTPUT CURRENT (mA)
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
Typical Operating Characteristics (continued)
(VIN = VEN = +12V, TA = +25C, unless otherwise noted.)
DROPOUT VOLTAGE vs. TEMPERATURE
MAX16803 toc04
SHUTDOWN CURRENT vs. TEMPERATURE
MAX16803 toc05
+5V REGULATOR OUTPUT vs. TEMPERATURE
MAX16803 toc06
1.0 0.9 0.8 DROPOUT VOLTAGE (V) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 ILOAD = 350mA
35 30 SHUTDOWN CURRENT (A) 25 20 15 10 5 0 VIN = 6.5V VIN = 20V VIN = 12V VIN = 40V
5.5
5V REGULATOR OUTPUT (V)
5.4 ILOAD = 1mA 5.3 NO LOAD
5.2
5.1
ILOAD = 5mA
5.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
(VCS+ - VCS-) vs. IV5
0.209 0.208 0.207 (VCS+ - VCS-) (V) 0.206 0.205 0.204 0.203 0.202 0.201 0.200 0.199 0.198 0 1 2 3 4 IV5 (mA) 5 6 7 8
MAX16803 toc07
+5V REGULATOR OUTPUT vs. VIN
NO LOAD 5V REGULATOR OUTPUT (V) 5.25
MAX16803 toc08
200Hz DIMMED OPERATION
MAX16803 toc09
0.210
5.30
VDIM 2V/div 0V
ILOAD = 410mA
5.20
5.15 LOAD = 5mA 5.10 5 10 15 20
LOAD = 1mA
ILOAD = 350mA VIN = VEN = 12V DIM PULSED AT 200Hz (1% DUTY CYCLE)
ILOAD 200mA/div 0A
25
30
35
40
20s/div
VIN (V)
200Hz DIMMED OPERATION (EXPANDED)
MAX16803 toc10
200Hz DIMMED OPERATION (EXPANDED)
MAX16803 toc11
ILOAD = 350mA VIN = VEN = 12V DIM PULSED AT 200Hz (50% DUTY CYCLE)
VDIM 2V/div 0V ILOAD 200mA/div 0A
ILOAD = 350mA VIN = VEN = 12V DIM PULSED AT 200Hz (50% DUTY CYCLE)
VDIM 2V/div 0V ILOAD 200mA/div 0A
20s/div
20s/div
4
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High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
Typical Operating Characteristics (continued)
(VIN = VEN = +12V, TA = +25C, unless otherwise noted.)
VSNSE vs. VCSMAX16803 toc12
IDIM vs. VDIM
MAX16803 toc13
205
300 250 200
204
VSNSE (mV)
IDIM (A) VIN = 12V ILOAD = 350mA 2.0 2.5 3.0 3.5 VCS- (V) 4.0 4.5 5.0
203
150 100
202
201
50 0 0 2 4 6 8 VDIM (V) 10 12 14 16
200
Pin Description
PIN 1, 16 2, 3 4-8, 14 9 10 11 12 13 15 -- NAME OUT IN N.C. CS+ CSV5 GND DIM EN EP FUNCTION Current-Regulated Output. Connect pin 1 to pin 16. Positive Input Supply. Bypass IN with a 0.1F (min) capacitor to GND. Connect pin 2 to pin 3. Not Internally Connected Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS+ and CS- to program the output current level. Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS- and CS+ to program the output current level. +5V Regulated Output. Connect a 0.1F capacitor from V5 to GND. Ground Pulsed Dimming Input. Drive DIM low to disable the output. Drive DIM high to enable the output. Must not be left unconnected. Enable Input. Drive EN high to enable the output. Exposed Pad. Connect to the ground plane for effective power dissipation. Do not use as the only ground connection.
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5
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
Functional Diagram
IN V5 DIM
REGULATOR IN EN
ENABLE
REFERENCE GENERATOR
I_REG
OUT DIFFERENTIAL SENSE AMPLIFIER THERMAL SHUTDOWN CS+ CS-
MAX16803
Detailed Description
The MAX16803 is a high-current regulator capable of providing up to a total of 350mA of current to one or more strings of HB LEDs. A wide operating input voltage range of +6.5V to +40V makes the MAX16803 ideal for automotive applications. A +5V regulated output provides up to 4mA of current to power external circuitry. In addition, the MAX16803 features thermal and output short-circuit protection. The wide operating voltage range helps protect the MAX16803 against large transients such as those found in load-dump situations up to 40V. The MAX16803 uses a feedback loop to control the output current. The differential voltage across the sense resistor is compared to a fixed reference voltage, and the error is amplified to serve as the drive to the internal power series pass device (see the Functional Diagram). The regulation point is factory-set at (VCS+ VCS-) = 203mV 3.5%. The regulated current is user defined by the value of RSENSE. The MAX16803 is a current controller internally optimized for driving the impedance range expected from one or more HB LEDs.
+5V Regulator
The MAX16803 includes a fixed +5V output regulator that delivers up to 4mA of load current throughout the +6.5V to +40V input voltage range. Connect a 0.1F compensation capacitor from V5 to ground. Shorting V5 to ground disables the thermal shutdown. When EN is low, V5 is off. V5 stays on during PWM dimming.
Thermal Protection
The MAX16803 enters a thermal-shutdown mode in the event of overheating. This typically occurs in overload or output short-circuit conditions. If the junction temperature exceeds TJ = +155C (typ), the internal thermal-protection circuitry turns off the series pass device. The MAX16803 recovers from thermal-shutdown mode once the junction temperature drops by 23C (typ). The part therefore protects itself by thermally cycling in the event of a short-circuit or overload condition.
Applications Information
Programming the LED Current
The MAX16803 uses a sense resistor across CS+ and CS- to set the LED current. The differential sense amplifier connected across RSENSE provides ground-loop immunity and low-frequency noise rejection. The LED current is given by ILED = VSENSE / RSENSE
6
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator
Input-Voltage Considerations
For proper operation, the minimum input voltage must always be: VIN(MIN) VRSENSE(MAX) + VFT(MAX) + VDO(MAX) where VFT(MAX) is the total forward voltage of all series connected LEDs. The minimum operating voltage of the device is +6.5V. The device operates below +6.5V; however, output current may not meet the full regulation specification (see the Typical Operating Characteristics).
Paralleling Multiple MAX16803s to Drive One High-Power LED
For applications that require more than 350mA of LED current, two or more MAX16803s can be paralleled (see Figure 3). VCS_ should not exceed 4.1V.
MAX16803
R1 IN OUT
Low-Frequency PWM Dimming at the Output
The MAX16803 provides pulsed or chopped current dimming input (DIM). The other method is to connect DIM to V5 and EN to IN and pulse EN. Both methods generate a regulated-amplitude PWM current (variable duty cycle) that can provide control over the LED brightness (see Figures 1 and 2).
VDIM
EN C1
V5 C2
MAX16803
V5 DIM CS+ CSGND
16 OUT 1 VIN C1 3 4 IN N.C. N.C. 5 2 OUT IN
15 EN
14 N.C.
13 DIM GND 12 D1 V5 11 ILED
MAX16803
C2 CS- 10 CS+ 9 RSENSE
V5 R2 IN OUT
N.C. 6
N.C. 7
N.C. 8
EN C3
V5 C4
Figure 1. Dimming with EN Connected to VIN at a Constant Voltage and DIM Pulsed
MAX16803
V5 DIM CS+ CSLEDs
16 OUT 1 VIN C1 3 4 IN N.C. N.C. 5 2 OUT IN
15 EN
14 N.C.
13 DIM GND 12 D1 V5 11 C2 CS- 10 CS+ 9 RSENSE ILED
GND
MAX16803
Figure 3. Paralleling MAX16803s
N.C. 6
N.C. 7
N.C. 8
Figure 2. Dimming with DIM Connected to V5, EN Connected to VIN _______________________________________________________________________________________ 7
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
Two Brightness Levels for TAIL/STOP Lights
Figure 4 shows PWM dimming operation for the MAX16803 with an ICM7555 timer. The ICM7555 provides adjustable duty cycle using two external resistors and a capacitor. In TAIL operation, the output of the ICM7555 feeds into DIM and lights up the LEDs. The LED's brightness depends on the duty cycle of the ICM7555. When VSTOP is present, DIM is pulled up to VSTOP. The PWM dimming operation is disabled and the LEDs light up to full brightness. See the ICM7555 data sheet for formulas to calculate the dimming frequency and the duty cycle.
D1 STOP D2 TAIL R1 C1 D3 IN DIS R3 TH TRG C3 OUT D4 DIM CS+ RSENSE EN IN OUT
LED Current Thermal Foldback
With a minimum number of external components, the MAX16803 provides LED current thermal foldback using a negative temperature coefficient (NTC) thermistor. Figure 5 shows a thermistor connected to V5 and the CS+ of the MAX16803. As the temperature increases, the voltage drop across R2 increases causing the LED current to decrease. ILED = [VSENSE - [R2 / (R2 + RT)] x V5] / R1
R2
MAX16803
V5
+5V REG C2
LEDs
ICM7555
GND GND
CS-
Figure 4. PWM Dimming Operation with ICM7555 Timer
VIN
IN EN
OUT V5 C2 LEDs
MAX16803
PWM DIMMING C1 DIM CS+
RT R2
R1 GND CS-
Figure 5. LED Current Thermal Foldback with an NTC Thermistor 8 _______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator
Other Applications
The application circuit in Figure 6 implements a twolevel brightness current for TAIL/STOP lights. In TAIL operation, Q1 is off and the R1 sets the output current. In STOP operation, Q1 turns on and the output current is set by a parallel combination of R1 and R2. Figure 7 shows an application circuit with the MAX16803 using a single BJT to provide high output current. For proper operation: VIN(MIN) > VCESAT(MAX) + VFT(MAX) + VRSENSE where VCESAT(MAX) is the maximum saturation voltage of the external BJT.
MAX16803
STOP
TAIL
IN
OUT
EN V5 C1 DIM
V5
MAX16803
CS+
C2
LEDs
R2 R1 Q1 GND CS-
Figure 6. Two Brightness Level with Current Level Switch for Tail/Stop Lights
LEDs
VIN
IN EN
OUT V5 C2
Q1
MAX16803
PWM DIMMING C1 DIM CS+ RSENSE GND CS-
Figure 7. Increased LED Current (Amper Range) with a Single BJT
_______________________________________________________________________________________
9
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
Multichannel HB LED Driver
Figure 8 shows an array of MAX16803s with independent DIM control. The MAX5094C, a current-mode PWM controller, provides the input power to each LED driver preregulated voltage to multiple MAX16803 drivers.
L1 VIN
D1
CREF REF C2 R3 CCOMP COMP RCOMP C6 FB GND DIM CS+ R5 VCC C3 IN OUT IN OUT IN OUT
U2
EN
MAX5094C
OUT Q1 C4
LEDs V5 C7 C10 DIM EN
U4 MAX16803
V5 C11
LEDs EN C8 CS+ R7 DIM
U3 MAX16803
V5 C9
LEDs
MAX16803
CS+ R6
CT/RT CT
CS R2
R4
GND
CS-
GND
CS-
GND
CS-
Figure 8. Multichannel HB LED Driver for LCD Backlight
Typical Operating Circuit
PROCESS: BiCMOS
VDIM
Chip Information
16 OUT 1 VIN C1 3 4 IN N.C. N.C. 5 2 OUT IN
15 EN
14 N.C.
13 DIM GND 12 D1 V5 11 C2 CS- 10 CS+ 9 RSENSE
MAX16803
N.C. 6
N.C. 7
N.C. 8
10
______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
MAX16803
D2 D D/2 MARKING k L
C L
b D2/2
0.10 M C A B
AAAAA
E/2 E2/2 E (NE-1) X e
C L
E2
PIN # 1 I.D.
DETAIL A
e (ND-1) X e
e/2
PIN # 1 I.D. 0.35x45 DETAIL B
e
L1
L
C L
C L
L
L
e 0.10 C A 0.08 C
e
C
A1 A3
PACKAGE OUTLINE, 16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
-DRAWING NOT TO SCALE-
21-0140
I
1 2
______________________________________________________________________________________
QFN THIN.EPS
11
High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator MAX16803
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
COMMON DIMENSIONS
PKG. 16L 5x5 20L 5x5 28L 5x5 32L 5x5 40L 5x5 SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.
EXPOSED PAD VARIATIONS PKG. CODES T1655-2 T1655-3 T1655N-1 T2055-3
D2
3.10 3.10 3.10 3.10 3.10 3.25 3.25 2.70 2.70 3.25 2.70 3.25 3.25 3.10 3.10 3.10 3.10 3.30 3.20 3.20 3.20 3.20 3.20 3.35 3.35 2.80 2.80 3.35 2.80 3.35 3.35 3.20 3.20 3.20 3.20 3.40 3.00 3.00 3.00 3.00 3.00 3.15 3.15 2.60 2.60 3.15 2.60 3.15 3.15 3 3.00 3 3.00 3.00 3.00 3.20
E2
exceptions
L
MIN. NOM. MAX. MIN. NOM. MAX. 0.15
DOWN BONDS ALLOWED
A A1 A3 b D E e k L
0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0.20 REF. 0.20 REF. 0.20 REF. 0.20 REF. 0.20 REF. 0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 0.65 BSC. 0.50 BSC. 0.40 BSC. 0.80 BSC. 0.50 BSC.
- 0.25 - 0.25 0.25 - 0.25 - 0.25 0.35 0.45 0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60 L1 - 0.30 0.40 0.50 40 N 16 20 28 32 ND 4 10 5 7 8 4 10 5 7 8 NE WHHB ----WHHC WHHD-1 WHHD-2 JEDEC
NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. 5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm FROM TERMINAL TIP.
3.00 3.00 3.00 3.00 3.00 T2055-4 T2055-5 3.15 T2855-3 3.15 T2855-4 2.60 T2855-5 2.60 3.15 T2855-6 T2855-7 2.60 T2855-8 3.15 T2855N-1 3.15 T3255-3 3.00 T3255-4 3.00 T3255-5 3.00 T3255N-1 3.00 T4055-1 3.20
3.10 3.10 3.10 3.10 3.10 3.25 3.25 2.70 2.70 3.25 2.70 3.25 3.25 3.10 3.10 3.10 3.10 3.30
3.20 3.20 3.20 3.20 3.20 3.35 3.35 2.80 2.80 3.35 2.80 3.35 3.35 3.20 3.20 3.20 3.20 3.40
** ** ** ** ** 0.40 ** ** ** ** ** 0.40 ** ** ** ** ** **
YES NO NO YES NO YES YES YES NO NO YES YES NO YES NO YES NO YES
** SEE COMMON DIMENSIONS TABLE
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. 7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. 8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-3 AND T2855-6. 10. WARPAGE SHALL NOT EXCEED 0.10 mm. 11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. 12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. 13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", 0.05.
PACKAGE OUTLINE, 16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
-DRAWING NOT TO SCALE-
21-0140
I
2 2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Heaney

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