SC4541 Datasheet

SC4541
POWER MANAGEMENT
Features
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High Frequency LED Driver with
Integrated Schottky and Simple Interconnect
Description
The SC4541 is a fully integrated, high voltage boost (stepup) and buck (step-down) LED driver. The input voltage
range is 2.9V to 22V with output voltage up to 25V. The
device is capable of driving up to 7 white LEDs. The high
side sense enables a single-wire LED connection by taking
advantage of the available system ground. This reduces
connector cost and complexity.
VIN Range — 2.9V to 22V
VOUT Range — Up to 25V
IOUT Range:
„„ Up to 100mA (Boost)
„„ Up to 200mA (Buck)
Drives Up to 7 Series WLEDs (Boost)
Drives Up to 5 Series WLEDs (Buck)
Integrated Schottky Rectifier
Single-Wire LED Connect
Current Mode Control
„„ Frequency — 2.0MHz
„„ No External Compensation
Direct PWM Dimming
„„ 100:1 Range at 500Hz
Open-LED Protection — 27V
Low Shutdown Current < 1µA
Package Options:
„„ Low Profile MLPD-UT, 6-pin 2x2 x0.6(mm)
„„ SOT23, 6-pin 2.9x2.8 x1.45(mm)
Lead-free, Halogen-Free and WeEE/RoHS Compliant
The device includes a current mode PWM controller,
260mA power switch, and high performance Schottky
rectifier. The LED driver eliminates external compensation
components for minimum solution size.
The wide input voltage range and low standby current are
ideal for portable devices. The high input voltage allows
direct connection to multi-cell battery packs which
increases operating efficiency and extends battery life.
Output current is programmed with an external sense
resistor up to 100mA (Boost) or 200mA (Buck). The device
provides ±5% constant current accuracy across the entire
operating temperature range.
A logic level PWM dimming signal may be applied directly
to the enable (EN) pin - for direct PWM dimming with a
wide dimming range. Output OVP (over voltage protection) protects the SC4541 from open circuit faults in the LED
string or connector. External OVP programming resistors
are not required.
Applications
Keypad Illumination
„„ DSC and DSLR Display Backlight
„„ Cellular Handsets
„„ Automotive Lighting
„„
The SC4541 is available in low profile MLPD-UT and
SOT23,6-pin packages. The device is rated across the
temperature range -40°C to +85°C.
Typical Application Circuit
Boost Topology IOUT up to 100mA
VIN 2.9V to 22V
L1
10μF
C1
1μF
IN
SW
OUT
SC4541
EN
PWM
Dimming
Version 1.3
GND
VOUT Up to 25V
C2
1μF
RS
10Ω
FB
© 2011 Semtech Corporation
7 WLED @
20mA
1
SC4541
Pin Configuration, SOT23-6
Pin Configuration, MLPD-UT6
IN
1
6
EN
5
FB
4
OUT
OUT
FB
EN
6
5
4
TOP VIEW
GND
2
SW
3
T
MLPD-UT: 2 x 2(mm) 6 Lead
θJA = 75º C/W
Marking Information, MLPD-UT6
FR7 = Code for SC4541
EW = Datecode
Top View
1
2
3
SW
GND
IN
SOT23, 6 Lead
θJA = 150º C/W
Marking Information, SOT23-6
LK5A = Code for SC4541
Eyww = Datecode
Ordering Information
Device
Package
SC4541SKTRT(1,2)
SOT23-6
SC4541ULTRT(1,2)
2 x 2 x 0.6(mm) MLPD-UT6
SC4541EVB-1
Evaluation Board, SOT23-6
SC4541EVB-2
Evaluation Board, MLPD-UT6
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Available in lead-free package only. Device is WEEE/RoHS compliant
and halogen-free.
2
SC4541
Absolute Maximum Ratings
Recommended Operating Conditions
Supply IN Voltage(V) . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 26
Supply IN Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 to 22
SW Voltage, OUT Voltage(V) . . . . . . . . . . . . . . . . . -0.3 to 28
Maximum Output Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . 25
FB, Enable Voltage(V) . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN+0.3
Ambient Temperature Range (°C) . . . . . . . . . . . . . -40 to +85
ESD Protection Level (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
(1)
Thermal Information
Thermal Resistance, Junction to Ambient(2)
MLPD-UT6(°C/W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
SOT23-6(°C/W). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +125
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . . +300
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114-B.
(2) Calculated from package in still air, mounted to 3 x 4.5(in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
VIN =5V, CIN=1uF, COUT=1uF, L=10uH, TA= -40°C to 85°C, unless specified otherwise.
Parameter
Symbol
Conditions
Min
Typ
Input Voltage
VIN
Supply Current
IIN(Q)
VIN=22V, VOUT=18V, VFB=17V, EN=3V
Shutdown Supply Current
IIN(SHDN)
EN=0V
EN Logic High Voltage
VEN(H)
EN Logic Low Voltage
VEN(L)
0.4
V
EN Logic Bias Current
IEN(L), IEN(H)
1
µA
2.4
MHz
2.9
1.5
Max
Units
22
V
3
mA
1
µA
2
V
Boost Converter Characteristics
Switching Frequency
fSW
1.6
Maximum Duty Cycle
DMAX
84
Switch Current limit
ILIMIT
260
Switch Leakage Current
ISW
Switch Saturation Voltage
OUT Over-Voltage Protection
Schottky Forward Drop
2.0
%
350
450
mA
VSW = 18V
0.1
5
µA
VSAT
ISW = 0.2A
200
VOUT(OVP)
TA=25°C
VF(D)
IOUT = 100mA, TA=25°C
25.5
mV
28.0
0.7
V
V
3
SC4541
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
ILEAK(D)
VOUT = 20V
Min
Typ
Max
Units
4
µA
208
mV
212
mV
Boost Converter Characteristics (continued)
Schottky Leakage Current
Current Sink Characteristics
LED Current Sense Voltage (VOUT-VFB)
OUT Pin Bias Current
FB Pin Bias Current
VOUT, VFB Common Mode Voltage
VSENSE
VOUT=18V, TA=25°C
192
VOUT=18V, TA=-40°C to 85°C
188
200
IOUTB(BIAS)
VOUT=18V
55
µA
IFB(BIAS)
VFB=18V
12
µA
VCM
2.9
V
4
SC4541
Typical Characteristics
EN Threshold
EN Threshold Voltage (V)
2.0
VIN = 10V
1.6
Switching
Frequency(SS302R2)
1.2
0.8
0.4
0.0
-40
25
85
Temperature (oC)
Switching Frequency
2.2
500
VIN = 5V
VIN = 12V
VIN = 22V
Switch Current Limit (mA)
Switching Frequency (MHz)
2.4
Switch Current Limit
2.0
1.8
1.6
-40
400
300
200
100
0
25
Temperature (oC)
85
-40
Switch Leakage Current
85
Output Over Voltage Protection
VSW = 10V
30.0
Over Voltage Protection (V)
Switch Leakage Current (μA)
2.0
25
Temperature (oC)
1.6
1.2
0.8
0.4
0.0
25.0
20.0
15.0
10.0
-40
25
Temperature (oC)
85
-40
25
Temperature (oC)
85
5
SC4541
Typical Characteristics (continued)
Schottky Leakage Current
Schottky Forward Drop
1.0
Schottky Leakage Current (μ A)
Schottky Forward Drop (V)
1.0
0.8
FB (SS302R2)
0.6
0.4
0.2
0.0
-40
25
Temperature (oC)
85
VSCHT = 20V
0.8
0.6
0.4
0.2
0.0
-40
25
Temperature (oC)
85
LED Current Sense Voltage (mV)
LED Current Sense Voltage(FB)
210
VIN = 5V
VIN = 12V
VIN = 22V
205
VOUT = 18V
200
195
190
-40
25
Temperature (oC)
85
6
SC4541
Typical Characteristics (continued)
Shut
Start up By Vin
Conditions: 5VIN, 20mA ,6 LEDs in series, CIN/COUT=1µF, L=10µH
DownR1=10Ω
Test condition: 5Vin,Shut
LEDs=6S1P,
Ω, SC4541(1120)
Start-up
— by
VINΩ, SC4541(1120)
Test condition: 5Vin,
LEDs=6S1P,
R1=10Ω
VIN
VIN
(2.5V/div)
VOUT
VIN
(2.5V/div)
VIN
VOUT
(5V/div)
VOUT
(5V/div)
IL
(0.2A/div)
IL
IL
(0.2A/div)
SW
VSW
(10V/div)
VOUT
IL
VSW
(10V/div)
SW
Time (2mS/div)
Start up By PWM
Mail Pow
Main
Switching
Test condition:
5Vin,Power
LEDs=6S1P,
R1=10Ω, SC4541(1120)
Start-up
— by PWM
Test condition:
5Vin, LEDs=6S1P,
R1=10Ω
Ω,
SC4541(1120),
PWM
300Hz
PWM Dimming,
0.1%Dimming
Duty Cycle300Hz, 0.1% duty.
VOUT
VOUT
(5V/div)
IL
(0.3A/div)
Time (5mS/div)
VIN
(1V/div)
VOUT
(50mV/div)
VIN
VOUT
IL
IL
IL
(0.2A/div)
VSW
(10V/div)
SW
PWM
(3V/div)
EN
VSW
(5V/div)
VIN Fluctuation — Rising
Test condition: 5Vin to 12Vin, LEDs=6S1P,
R1=10Ω
Ω, SC4541(1120)
SW
Time (0.5μS/div)
Time (0.1S/div)
VIN Fluctuation - Rising
VIN Fluctuation — Falling
VIN Fluc
12VIN toTest
5VIN condition: 5Vin to 12Vin, LEDs=6S1P,
5VIN to 12VIN
R1=10Ω
Ω, SC4541(1120)
VIN
VIN
(5V/div)
VIN
(5V/div)
VIN
VOUT
(1V/div)
VOUT
VSW
(10V/div)
SW
Time (2μS/div)
VOUT
(1V/div)
VOUT
VSW
(10V/div)
SW
Time (20μS/div)
7
SC4541
Typical Characteristics (continued)
PWM
Conditions: 5VIN, 20mA ,6 LEDs in series, CIN/COUT=1µF, L=10µH
Over Voltage Protection
Over Voltage Protection
PWM
Dimming
(0.1% duty
cycle)
Test condition:
5Vin, LEDs=6S1P,
R1=10Ω
Ω,
Dimming
300HzSC4541(1120),
PWM Dimming,PWM
0.1% Duty
Cycle 300Hz, 0.1% duty.
Test condition: 5Vin, LEDs=6S1P, R1=10Ω
Ω, SC4541(1120)
VIN
(3V/div)
VIN
VOUT
VOUT
(5V/div)
IL
(0.4A/div)
VOUT
VOUT
(5V/div)
IL
(0.3A/div)
IL
VSW
(10V/div)
SW
IL
VSW
(10V/div)
Time (0.1mS/div)
Test
condition:
5Vin, LEDs=6S1P,
R1=10Ω
Ω,
PWM
Dimming
(50% duty
cycle)
SC4541(1120)
,
PWM
Dimming
300Hz,
50%
duty.
300Hz PWM Dimming, 50% Duty Cycle
SW
VEN
(3V/div)
PWM Dimming
EN
Time (0.5mS/div)
VOUT
VOUT
(5V/div)
IL
(0.3A/div)
IL
VSW
(10V/div)
SW
VEN
(3V/div)
Time (2mS/div)
EN
8
SC4541
Pin Descriptions
Pin #
MLPD-WL6
Pin #
SOT23-6
Pin Name
1
3
IN
2
2
GND
3
1
SW
Collector of the internal power transistor — connect this pin to the boost inductor.
4
6
OUT
Output voltage pin — this pin is the output of the internal Schottky diode. Connect this pin to a
ceramic output (1µF typical) capacitor and current sense resistor.
5
5
FB
LED current feedback pin — connect this pin to anode of the topmost LED in the string and
the current sense resistor to set the total current in the LED string(s). LED current is set by :
200/RSENSE (mA), where RSENSE is in Ohms.
6
4
EN
Enable and PWM control pin for LED string — pulling this pin logic high enables the device.
T
N/A
Thermal Pad
Pad for heat sinking purposes — connect to the external ground plane using multiple vias
when using MLPD-UT6 package. Not electrically connected internally. The SOT23-6 does not
have a thermal pad.
Pin Function
Input supply pin — add a ceramic capacitor between this pin and ground.
Ground pin — connect to external ground plane.
Block Diagram
SW
3
VIN
EN
1
6
Bandgap
Reference
1.25V
-
4
OUT
2
GND
5
FB
PWM
Q1
R Q
+
S
Error Amplifier
200mV
Slope
Comp
+
-
Osc
2MHz
+
Rc
RSENSE
-
Cc
EN
OVP
+
- 1.25V
A=1
+
-
9
SC4541
Applications Information
Operation
The SC4541 is a fixed frequency step-up current-mode
switching regulator with an integrated Schottky diode
and power transistor (see the Block Diagram for more
information).
When EN is low, the device is in shutdown mode and
draws less than 1μA of current. The internal circuitry is
enabled and turns on when EN is logic high. The voltage
drop across OUT and FB is reflected to ground and fed to
the negative input of the error amplifier and a 200mV
reference signal is fed to the positive input of the error
amplifier. The output of the error amplifier is one input to
the PWM comparator. The device is designed to be stable
without additional external compensation components.
the efficiency. The internal oscillator sets a high switching
frequency of 2.0MHz which further reduces the total solution size by minimizing external L/C filter size.
Over-Voltage Protection (OVP)
An integrated over-voltage protection circuit prevents the
OUT voltage from exceeding the maximum switch voltage
rating (28V). When EN is high, a resistor divider from OUT
to GND is switched in to monitor OUT for over-voltage
protection. If OUT rises higher than the OVP threshold,
typically 27V, the OVP comparator will trip and reset the
latch to turn Q1 off. When OUT drops back below the OVP
threshold, Q1 will turn back on in the next oscillator cycle.
This sequence will repeat for as long as the over-voltage
condition persists.
Switch current is sensed with an integrated sense resistor
and is summed with the slope-compensating ramp which is
then fed as the modulating ramp input to the PWM comparator. The latch is reset and Q1 is turned off when the
modulating ramp intersects the error amplifier output. The
latch will also be reset if the current in Q1 exceeds the
current limit threshold, typically 350mA. The latch is set and
Q1 turns on at the beginning of every oscillator clock cycle.
Enable and PWM Dimming
The SC4541 has a built-in Schottky diode. When input
voltage is applied an inrush current flows through the
inductor and the Schottky diode and charges up the
output capacitor connected to OUT. The Schottky diode
inside the SC4541 can sustain a maximum current of 1A.
The inductance value affects the converter’s steady state
operation, transient response, and its loop stability.
Attention must be given to inductor parameters; including inductance, DC resistance, and saturation current. The
inductance and operating conditions determine the
inductor ripple current. The converter can operate in continuous conduction mode (CCM) or discontinuous conduction mode (DCM). The inductor DC current or input
current can be calculated using the following equation.
Programming the LED Current
The circuit will maintain the necessary output voltage to
ensure 200mV across OUT and FB pins. Refer to the Typical
Application Circuit on page 1. The LED current is programmed by connecting a resistor (RSENSE) between the
OUT pin and FB pin. The LED current, in mA, is set by using
the following relationship.
ILED = 200/RSENSE
where RSENSE value is in Ohms.
ILED value is in mA.
The feedback voltage has a direct effect on the converter
efficiency. Because the voltage drop across the feedback
resistor does not contribute to the output power (LED
brightness), the lower the feedback voltage, the higher
The EN pin could be toggled for direct PWM dimming. In
a typical application, a microcontroller sets a register
which varies the pulse width on a GPIO which is tied to EN
pin. Direct PWM dimming can be used to control LED
brightness when a PWM signal (up to 1kHz) with wide
duty ratio is applied.
Inductor Selection
IIN
VOUT u IOUT
VIN u K
IIN - Input current;
IOUT – Output current;
VOUT – Boost output voltage;
VIN – Input voltage;
η – Efficiency of the boost converter.
10
SC4541
Applications Information ( continued)
The converter has higher efficiency under CCM and the
inductor peak current is calculated by the following
equation.
IL _ PEAK
IIN VIN u D
2 u FS u L
Assuming CCM, the duty ratio is calculated using the following equation.
D
VOUT VIN VD
VOUT VD
A 1µF ceramic input and output capacitor should be adequate for most applications. Larger capacitance reduces
voltage ripple, overshoot and undershoot during load
transient as well as improving loop stability margin.
Recommended ceramic capacitor manufacturers are
listed in Table 1.
Table 2 — Recommended Ceramic Capacitor
Manufacturers
Vendor
VD is the forward voltage drop of the internal Schottky
rectifier.
Phone
Website
Kemet
408-986-0424
www.kemet.com
Murata
814-237-1431
www.murata.com
Taiyo Yuden
408-573-4150
www.t-yuden.com
The inductor ripple current is further shown by the following equation.
IL _ RIPPLE
VIN u D
FS u L
The recommended inductance shown in Table 1 is based
on operation with regulated 5V input, dual Li-ion or three
Li-ion battery packs. Increased inductance is required for
higher input and output voltage configurations.
Table 1 — Inductance Requirements, Driving 6 bWLED
Input Type
Input Voltage
Range
L1 Inductance
4.5 to 5.5V
10µH
Dual Lithium Ion Battery Pack
5.4 to 8.4V
22µH
Three Lithium Ion Battery Pack
8.1 to 12.6V
33µH
Regulated 5V
Output Capacitor Selection
Ceramic capacitors are placed near IN and OUT pins to
ground in order to minimize ripple voltage. The minimum
capacitance needed for a given ripple can be estimated
using the following equation.
COUT
VOUT VIN u IOUT
VOUT u FS u VRIPPLE
VRIPPLE = Peak to peak output voltage ripple
IOUT = Output current
VOUT = Boost output voltage
VIN = Input voltage
FS = Switching frequency
11
SC4541
Applications Information ( continued)
PCB Layout Considerations
Poor layout can degrade the performance of the DC-DC
converter and can be a contributory factor in EMI problems, ground bounce, thermal issues, and resistive
voltage losses. Poor regulation and instability can result.
A typical application schematic is shown in Figure 1. A
typical PCB layout is shown in Figure 4.
VIN (5V)
The following design rules are recommended:
Place the inductor and filter capacitors as close
to the device as possible and use short, wide
traces between the power components.
Use a ground plane to further reduce noise
interference on sensitive circuit nodes.
••
••
R5
10KΩ
PWM(300Hz, 3.3V)
U1
IN
C3
SC4541
1μF
16V
L1
EN
GND
10μH
VOUT
OUT
SW
C2
1μF
35V
R1
10Ω
FB
EDP
LED1
LED2
LED3
LED4
L1: MURATA LQH3NPN100NM0 (10μH/ 550mA/ 3x3x1.4(mm)
LED5
C2: MURATA GRM188R7YA105K(1μF/ X7R/ 35V/ 0603)
C3: MURATA GRM188R71C105K(1μF/ X7R/ 16V/ 0603)
LED6
Efficiency Boost_Vout
LED1 to 6: Everlight 12-21C/T3D-CP1Q2B12Y/2C
Efficiency
Boost_Iout
Figure 1 — Typical Application Schematic, Boost Topology
82%
85%
5Vin, 10uH(A915AY-100M)
80%
80%
70%
E ffic ie nc y (% )
E ffic ie n c y (% )
75%
3S1P
4S1P
5S1P
65%
60%
6S1P
7S1P
8S1P
55%
50%
10uH(A915AY-100M)
78%
76%
74%
5Vin
72%
3.6Vin
70%
0
3
5
8
10
13
Iout(mA)
15
18
20
8
10
12
14
16
Vout(V)
18
20
22
24
26
12
SC4541
Efficiency
Schematic (Buck)
Applications Information ( continued)
12Vin, 2LED, Buck topology
VIN
R5
12V
10K
85
U1
IN
EN
80
6
OPT
2
SC4541
GND
3
SW
FB
5
C2
12V
1uF
7
10uH
VIN2
4
R1
1
EDP
L1
OUT
Efficiency(% )
1
C3
C5
75
70
65
1uF * 3pcs
LED10
LED9
LED17
LED16
60
0
20
40
60
80
100
120
140
160
180
200
Output Current(mA)
(1) L1: Murata LQH3NPN100MM0L
(2) C2,C5: Murata GRM188R7YA105K
Efficiency (Buck, High
Figure 2 — Typical Application Schematic, Buck Topology
Schematic (Buck, High Efficiency Option)
< High Efficiency Option >
< High Efficiency Option >
12Vin, 2LED, Buck topology
VIN
R5
3.3V
10K
90
85
U1
IN
1uF
GND
EN
SC4541
10uH
EDP
L1
SW
VIN2
OUT
R1
1
FB
C2
1uF
12V
Efficiency(% )
C3
80
75
70
C5
1uF * 3pcs
LED10
LED9
LED17
LED16
65
60
0
20
40
60
80
100
120
140
160
180
200
Output Current(mA)
(1) L1: Murata LQH3NPN100MM0L
(2) C2, C3,C5: Murata GRM188R7YA105K
Figure 3 — Typical Application Schematic, High Efficiency of Buck Topology
13
SC4541
Efficiency 5Vin, LEDs
5Vin, LEDs 6S1P
Applications Information ( continued)
R5
5Vin 6S1P LED
10K
75
U1
C3
5V
IN
EN
70
1uF
SC4541
GND
EDP
L1
SW
10uH
OUT
R1
10
C2
1uF
FB
Efficieny(%)
VIN
C5
LED27
LED26
LED25
60
55
50
45
1uF
LED28
65
LED24
LED23
0
5
10
ILED(mA)
15
20
LEDs: EVERLIGHT EHP-109/UB31H-PU5/TR
Efficiency(LEDs
L1: Murata LQH3NPN100NG0L
C1, C2, C5: Murata GRM21BR71H105K
Figure 4 — Typical Application Schematic, Floating Buck-Boost Topology
LEDs 1S2P, 200mA
R5
10K
C3
6V to 22V
IN
1uF
GND
EN
SC4541
SW
C2
1uF
61
59
57
C5
4.7uF
LED9
R1
10
FB
7
22uH
EDP
L1
63
OUT
Efficieny(%)
VIN
1S2P LED, 200mA
65
U1
55
3
LED10
6
9
12
15
18
21
24
Vin(V)
LEDs: EVERLIGHT EHP-109/UB31H-PU5/TR
L1: Cooper SD52-220-R
C1, C2: Murata GRM21BR71H105K
C5: Murata GRM31CR71H475K
Figure 5 — Typical Application Schematic, Floating Buck-Boost Topology
14
SC4541
Applications Information ( continued)
(Bottom layer)
(TOP layer)
Figure 4 — Typical PCB Layout
15
SC4541
Outline Drawing — 2x2 MLPD-UT6
A
D
B
DIM
E
PIN 1
INDICATOR
(LASER MARK)
A2
A
SEATING
PLANE
aaa C
C
A1
A
A1
A2
b
D
D1
E
E1
e
L
N
aaa
bbb
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
.024
.002
(.006)
.007 .010 .012
.075 .079 .083
.061 .067 .071
.075 .079 .083
.026 .031 .035
.020 BSC
.010 .014 .018
6
.003
.004
.020
.000
0.60
0.05
(0.152)
0.18 0.25 0.30
1.90 2.00 2.10
1.55 1.70 1.80
1.90 2.00 2.10
0.65 0.80 0.90
0.50 BSC
0.25 0.35 0.45
6
0.08
0.10
0.50
0.00
D1
2
1
LxN
E1
N
bxN
e
bbb
C A B
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
16
SC4541
Land Pattern — 2x2 MLPD-UT6
H
R
DIM
(C)
G
K
Y
P
X
Z
C
G
H
K
P
R
X
Y
Z
DIMENSIONS
MILLIMETERS
INCHES
(.077)
.047
.067
.031
.020
.006
.012
.030
.106
(1.95)
1.20
1.70
0.80
0.50
0.15
0.30
0.75
2.70
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2.
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
3.
THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD
SHALL BE CONNECTED TO A SYSTEM GROUND PLANE.
FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR
FUNCTIONAL PERFORMANCE OF THE DEVICE.
17
SC4541
Outline Drawing — SOT23-6
DIMENSIONS
A
DIM
e1
A
A1
A2
D
b
c
D
E1
E
e
e1
L
L1
N
01
aaa
bbb
ccc
N
2X E/2
E1
1
E
2
ccc C
2X N/2 TIPS
e
B
D
aaa C
SEATING
PLANE
A2 A
C
A1
bxN
bbb
MILLIMETERS
MIN NOM MAX
1.45
0.90
0.00
0.15
0.90 1.15 1.30
0.25
0.50
0.08
0.22
2.80 2.90 3.10
1.50 1.60 1.75
2.80 BSC
0.95 BSC
1.90 BSC
0.30 0.45 0.60
(0.60)
0°
6
0.10
0.20
0.20
10°
H
c
GAUGE
PLANE
C A-B D
0.25
01
L
SEE DETAIL
(L1)
A
DETAIL A
SIDE VIEW
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
Land Pattern — SOT23-6
DIMENSIONS
X
DIM
(C)
G
Y
Z
C
G
P
X
Y
Z
MILLIMETERS
(2.50)
1.40
0.95
0.60
1.10
3.60
P
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
18
SC4541
© 2011 Semtech Corporation
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information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable
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thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes
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beyond the specified maximum ratings or operation outside the specified range.
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
19