SEMTECH SC189CULTRT

SC189
2.5MHz, 1.5A Synchronous
Step Down Regulator
POWER MANAGEMENT
Features
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Description
VIN Range: 2.9 – 5.5V
VOUT Options: 1.0 - 3.3V
Up to 1.5A Output Current
Ultra-Small Footprint, <1mm Height Solution
2.5MHz Switching Frequency
Efficiency Up to 93%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
<1µA Shutdown Current
Internal Soft Start
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Adjustable Output Voltage
Available in SOT23-5 package and 2mm x 2mm x
0.6mm thermally enhanced MLPD-UT6 package
-40 to +85°C Temperature Range
Fully WEEE and RoHS Compliant
The SC189 is a high efficiency, synchronous step-down
regulator providing up to 1.5A output current in either
an ultra-small 2mm x 2mm, low profile package or a low
cost SOT23-5 package. The device requires only three
external filter components for a complete step down
regulator solution. The input voltage range is 2.9 to 5.5V
with either factory programmed outputs from 1.0 to 3.3V
or adjustable output via an external resistor divider.
The converter operates at fixed 2.5MHz switching
frequency allowing small L/C filtering components.
The voltage mode architecture is compatible with chip
inductors and capacitors for minimum PCB footprint and
lowest overall system cost. Total footprint of 25mm2 can
be achieved - making the SC189 the ideal solution for
high density systems. Solution height of <1mm is also
possible.
Up to 93% efficiency is achieved with low RDS(ON) internal
switches. PWM constant frequency operation ensures
low output ripple across the load range. 100% duty-cycle
provides 360mV dropout voltage at 1.5A which extends
the minimum input voltage for 2.5V and 3.3V outputs.
Excellent transient response is achieved with no external
compensation components.
The SC189 provides input under-voltage, output overvoltage, output short circuit and over-temperature
protection to safeguard the device and system under fault
conditions. The regulator provides integrated soft-start to
minimize inrush currents. Standby quiescient current is
less than 1µA.
Applications
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Bluetooth Radios
DSC and PMPs
GPS Devices
xDSL Systems
POL Regulators
Portable HDD
Wireless LAN
The SC189 is available in SOT23-5 and a thermally
enhanced 2mm x 2mm x 0.6mm MLPD-UT6 package
rated from -40 to +85°C.
Typical Application Circuit
Total PCB Area ~25mm2
SC189C
VIN
2.9V to 5.5V
CIN
10µF
VIN
LX
EN
VOUT
L
1µH
L
Chip
VOUT
1.20V/1.5A
COUT
22µF
COUT
0805
GND
SC189
CIN
0603
Actual Size
June 01, 2009
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SC189
Pin Configuration
NC
1
EN
2
VIN
3
Ordering Information
TOP VIEW
T
6
VOUT
5
GND
4
LX
2mm x 2mm x 0.6mm MLPD-UT6
θJA = 60°C/W(1)
VIN
1
GND
2
EN
3
5
LX
Device
Package & Description
SC189xULTRT(2)(3)(4)
2mm x 2mm x 0.6mm MLPD-UT6
SC189xSKTRT2)(3)(4)
SOT23-5
SC189xEVB(5)
Evaluation Board for MLPD-UT6
- Standard Size
(i.e., Wire Wound Inductor)
SC189xEVB-1(5)
Evaluation Board for MLPD-UT6
- Small Size
(i.e., Chip Inductor)
SC189xEVB-2(5)
Evaluation Board for SOT23-5
- Standard Size
(i.e., Wire Wound Inductor)
SC189xEVB-3(5)
Evaluation Board for SOT23-5
- Small Size
(i.e., Chip Inductor)
TOP VIEW
4
VOUT
Notes:
(1) Measured in free convection, mounted on 10mm x 10mm, 2 layer
FR4 PCB shown in figure 7 ( for MLPD-UT6 package) and figure 8 (
for SOT23-5 package) with copper of 1oz for each layer.
(2) Available in tape and reel only. A reel contains 3,000 devices.
(3) Available in lead-free package only. Device is WEEE and RoHS
compliant.
(4) “x” is the code of the output voltage. See Table 1 for the code. For
example, the device number for VOUT= 1.20V is SC189CULTRT.
(5) “x” is the code of the output voltage. See Table 1 for the code.
For example, the EVB for MLPD-UT6 package with VOUT= 1.20V is
SC189CEVB (Standard Size) or SC189CEVB-1 (Small Size).
SOT23-5
θJA = 90°C/W(1)
Marking Information
FLx
Table 1: Available Output Voltages
Marking for 2mm x 2mm MLPD-UT 6 Lead Package:
x = Code of the output voltage (Example: C for VOUT=1.20V)
oyw = Pin 1 and Datecode (Reference Package Marking Design
Guidelines, Appendix A)
Top Mark
Bottom Mark
189 x
Marking for SOT23, 5 Lead Package:
x = Code of the output voltage (Example: C for VOUT=1.20V)
yyww = Datecode (Example: 0852)
© 2009 Semtech Corp.
Code
for MLPD-UT6
Code
for SOT23-5
VOUT(1)
A
A
1.00
B
B
1.10
C
C
1.20
E
Not Available
1.28
F
Not Available
1.30
H
H
1.50
L
L
1.80
N
Not Available
2.00
T
Y
2.50
Not Available
V
2.70
Z
Z
3.30
Notes:
(1) Contact factory for unavaliable output voltage options.
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SC189
Recommended Operating Conditions
Absolute Maximum Ratings
VIN Supply Voltage ……………………………… -0.3 to 6.0V
VIN Supply Voltage ……………………………… 2.9 to 5.5V
LX Voltage
Maximum Output Current(3) …………………………… 1.5A
………….. -1 to VIN+1V, -3V (20ns Max), 6V Max
VOUT Voltage
Temperature Range …………………………… -40 to +85˚C
……………………………… -0.3 to VIN+0.3V
EN Voltage …………………………………. -0.3 to VIN+0.3V
Thermal Information
Peak IR Reflow temperature …………………………. 260°C
ESD Protection Level
(2)
………………………………….
Thermal Resistance, Junction to Ambient(1)
3kV
MLPD-UT6 Package ……………………………… 60°C/W
SOT23-5 Package
……………………………… 90°C/W
Maximum Junction Temperature …………………… +150°C
Storage Temperature Range ………………… -65 to +150 °C
Exceeding the absolute maximum ratings may result in permanent damage to the device and/or device malfunction. Operation outside of the
parameters specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Measured in free convection, mounted on 10mm x 10mm, 2 layer FR4 PCB shown in figure 7 ( for MLPD-UT6 package) and figure 8 ( for SOT235 package) with copper of 1oz for each layer.
(2) Tested according to JEDEC standard JESD22-A114-B.
(3) For SOT23-5 package, the limit of the maximum power dissiption shown in figure 2 may reduce the maximum output current.
Electrical Characteristics
Unless specified: VIN = 5.0V, CIN=10µF, COUT=10µF; L=2.2µH; -40°C<TA<+85 °C; TJ(MAX)=125°C; Unless otherwise noted typical values are TA=+25 °C.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Rising VIN
2.60
2.70
2.80
V
Under-Voltage Lockout
UVLO
Output Voltage Tolerance(1)
ΔVOUT
VIN=3.6V to 5.0V; No Load
-2.5
ILIMIT
Peak inductor current
2.0
IQ
EN= VIN, No Load
7.5
ISHDN
EN= GND
1
ILX= 100mA, for MLPD-UT6
0.13
ILX= -100mA, for SOT23-5
0.15
ILX= -100mA, for MLPD-UT6
0.10
ILX= -100mA, for SOT23-5
0.125
VIN=5.5V; LX=0V; EN=GND
1
Current Limit
VIN Supply Current
VIN Shutdown Current
High Side Switch Resistance
Low Side Switch Resistance
LX Leakage Current
RDSON_P
RDSON_N
ILK(LX)
Hysteresis
VIN=5.5V; LX=5.0V; EN=GND
250
-10
mV
+2.5
%
A
mA
10
µA
Ω
10
-1
µA
Line Regulation
ΔVLINE-REG
VIN= 3.6 – 5.0V; IOUT=0A
±1.0
%
Load Regulation(2)
ΔVLOAD-REG
VIN= 5.0V; IOUT=10mA – 1.5A
±1.0
%
Oscillator Frequency
FOSC
Soft-Start Time(2)
TSS
EN Input High Current
© 2009 Semtech Corp.
2.0
2.5
3.0
100
IEN_HI
EN=VIN
-2.0
MHz
µs
2.0
µA
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SC189
Electrical Characteristics (continued)
Unless specified: VIN = 5.0V, CIN=10µF, COUT=10µF; L=2.2µH; -40°C<TA<+85 °C; TJ(MAX)=125°C; Unless otherwise noted typical values are TA=+25 °C.
Parameter
Symbol
Conditions
Min
EN Input Low Current
IEN_LO
EN=GND
-2.0
EN Input High Threshold
VEN_HI
EN Input Low Threshold
VEN_LO
VOUT Over Voltage Protection(2)
VOVP
Thermal Shutdown Temperature (2)
TSD
TSD_HYS
Thermal Shutdown Hysteresis (2)
Typ
Max
Units
2.0
µA
1.2
V
0.4
V
115
%
Junction Temperature
+160
°C
Junction Temperature
10
°C
Notes:
(1) The “Output Voltage Tolerance” includes output voltage accuracy, voltage drift over temperature and the line regulation.
(2) Guaranteed by design.
© 2009 Semtech Corp.
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SC189
Typical Characteristics
Circuit Conditions: CIN= 10uF/6.3V; COUT= 10uF/6.3V for L=2.2uH; COUT= 22uF/6.3V for L=1uH.
Unless otherwise noted, L= 2.2uH (TOKO: 1071AS-2R2M) and SC189 in MLPD-UT6 package.
Efficiency
Efficiency vs. Load
Current (VOUT=3.3V)
100%
100%
95%
95%
VIN= 4.0V
VIN= 5.0V
90%
90%
85%
85%
Efficiency (%)
Efficiency (%)
Efficiency vs. Load
Current (VOUT=1.5V)
Efficiency
80%
75%
VIN= 3.3V
75%
70%
70%
VOUT= 1.50V
TA=25°C
65%
VIN= 5.0V
80%
VOUT= 3.30V
TA=25°C
65%
60%
60%
0.0
0.3
0.6
0.9
1.2
0.0
1.5
0.3
0.6
0.9
1.2
1.5
Output Current (A)
Output Current (A)
Efficiency vs. Load Current
(VIN=5.0V, VOUT=3.3V)
Efficiency
Efficiency
Efficiency vs. Load Current
(VIN=5.0V, VOUT=1.0V)
100%
100%
L=1071AS-2R2N (50m_typ)
L=1071AS-2R2N (50m_typ)
95%
95%
L=1071AS-1R0N (33m_typ)
90%
L=MDT2520-CR1R0M (60m_typ)
85%
Efficiency (%)
Efficiency (%)
90%
80%
75%
70%
L=1071AS-1R0N (33m_typ)
80%
L=MDT2520-CR1R0M (60m_typ)
75%
70%
VIN= 5.0V
VOUT= 1.0V
TA=25°C L=LQM2HPN1R0MG0 (55m_typ)
65%
85%
VIN= 5.0V
VOUT= 3.3V
TA=25°C
65%
60%
0.0
0.3
0.6
0.9
1.2
1.5
0.0
0.3
Output Current (A)
0.6
0.9
1.2
1.5
Output Current (A)
Total Loss vs. LoadLosses
Current (VOUT=3.3V)
Total Loss vs. LoadLosses
Current (VOUT=1.5V)
800
800
VOUT= 3.30V
TA=25°C
VOUT= 1.50V
TA=25°C
VIN= 3.3V
600
Loss (mW)
600
Loss (mW)
L=LQM2HP1R0MG0 (55m_typ)
60%
400
VIN= 5.0V
400
200
200
VIN= 5.0V
VIN= 4.0V
0
0
0.0
0.3
0.6
0.9
1.2
0.0
1.5
© 2009 Semtech Corp.
0.3
0.6
0.9
1.2
1.5
Output Current (A)
Output Current (A)
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SC189
Typical Characteristics (continued)
Circuit Conditions: CIN= 10uF/6.3V; COUT= 10uF/6.3V for L=2.2uH; COUT= 22uF/6.3V for L=1uH.
Unless otherwise noted, L= 2.2uH (TOKO: 1071AS-2R2M) and SC189 in MLPD-UT6 package.
Efficiency
Efficiency vs. Load Current
(VOUT=1.5V, SOT23-5)
Efficiency
Efficiency vs. Load Current
(VOUT=3.3V, SOT23-5)
100%
100%
VIN= 4.0V
95%
VIN= 5.0V
90%
90%
85%
85%
Efficiency (%)
Efficiency (%)
95%
80%
75%
VIN= 3.3V
75%
70%
70%
VOUT= 1.50V
TA=25°C
65%
VIN= 5.0V
80%
VOUT= 3.30V
TA=25°C
65%
60%
60%
0.0
0.3
0.6
0.9
1.2
0.0
1.5
0.3
0.6
0.9
1.2
1.5
Output Current (A)
Output Current (A)
Efficiency
Efficiency vs. Load
Current (SOT23-5)
Efficiency
Efficiency vs. Load
Current (SOT23-5)
100%
100%
VIN= 5.0V
VOUT= 1.0V
TA=25°C
95%
90%
L=1071AS-2R2N (50m_typ)
L=1071AS-2R2 (50m_typ)
95%
90%
Efficiency (%)
Efficiency (%)
L=1071AS-1R0 (33m_typ)
85%
80%
75%
85%
L=1071AS-1R0N (33m_typ)
80%
L=MDT2520-CR1R0M (60m_typ)
75%
70%
70%
VIN= 5.0V
VOUT= 3.3V
TA=25°C
L=LQM2HPN1R0MG0 (55m_typ)
65%
65%
L=MDT2520-CR1R0 (60m_typ)
60%
60%
0.0
0.3
0.6
0.9
Output Current (A)
1.2
0.0
1.5
0.3
0.6
0.9
Output Current (A)
1.2
1.5
Total Loss vs. Load Current
(VOUT=3.3V, SOT23-5)
Losses
Losses
Total Loss vs. Load Current
(VOUT=1.5V, SOT23-5)
800
800
VOUT= 3.30V
TA=25°C
VOUT= 1.50V
TA=25°C
VIN= 3.3V
600
Loss (mW)
600
Loss (mW)
L=LQM2HP1R0MG0 (55m_typ)
400
VIN= 5.0V
400
200
200
VIN= 5.0V
VIN= 4.0V
0
0
0.0
0.3
0.6
0.9
1.2
0.0
1.5
© 2009 Semtech Corp.
0.3
0.6
0.9
1.2
1.5
Output Current (A)
Output Current (A)
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SC189
Typical Characteristics (continued)
Circuit Conditions: CIN= 10uF/6.3V; COUT= 10uF/6.3V for L=2.2uH; COUT= 22uF/6.3V for L=1uH.
Unless otherwise noted, L= 2.2uH (TOKO: 1071AS-2R2M) and SC189 in MLPD-UT6 package.
RDSON
(P & N) Variation
Over Temperature
RDS(ON)
Variation
vs. Temperature
(P & N) Variation over Line
RDS(ON)RDSON
Variation
vs. Input Voltage
30%
20%
25%
15%
P-Channel
20%
10%
15%
5%
Variation
Variation
VIN= 5.0V
ILX= ±100mA
10%
5%
N-Channel
0%
-5%
0%
-10%
ILX= ±100mA
TA= 25°C
-5%
N-Channel
P-Channel
-15%
-10%
-20%
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
Input Voltage (V)
5%
60
85
1.0%
4%
0.8%
VOUT= 3.3V
3%
0.6%
2%
0.4%
1%
0.2%
Variation
Variation
35
Frequency
Variation
SwitchingSwitching
Frequency
vs. Temperature
Switching
Frequency vs.
Variation
over
Line
Switching
Frequency
Input
Voltage
0%
-1%
-2%
-0.2%
-0.6%
IOUT= 0A
TA= 25°C
-4%
0.0%
-0.4%
VOUT= 1.5V
-3%
VIN= 5.0V
IOUT= 0A
-0.8%
-5%
-1.0%
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
Input Voltage (V)
10
35
60
85
Ambient Temperature (°C)
Line Regulationvs.
over
Temperature
Line Regulation
Temperature
Line Regulation
ove Line
Line
Regulation
1.0%
1.0%
0.8%
0.8%
0.6%
0.6%
VOUT= 1.5V
0.4%
0.4%
0.2%
Regulation
Regulation
10
Ambient Temperature (°C)
0.0%
-0.2%
0.2%
0.0%
-0.2%
-0.4%
-0.4%
VOUT= 3.3V
-0.6%
-0.6%
IOUT= 0A
TA= 25°C
-0.8%
VOUT= 1.5V
IOUT= 0A
-0.8%
-1.0%
-1.0%
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
Input Voltage (V)
© 2009 Semtech Corp.
-15
10
35
60
85
Ambient Temperature (°C)
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SC189
Typical Characteristics (continued)
Circuit Conditions: CIN= 10uF/6.3V; COUT= 10uF/6.3V for L=2.2uH; COUT= 22uF/6.3V for L=1uH.
Unless otherwise noted, L= 2.2uH (TOKO: 1071AS-2R2M) and SC189 in MLPD-UT6 package.
Load Regulation
Load Regulation
(VOUT=3.3V)
Load Regulation
Load Regulation
(VOUT=1.5V)
1.0%
1.0%
VOUT= 1.50V
TA=25°C
0.8%
0.6%
0.6%
0.4%
0.4%
VIN= 3.3V
Load Regulation
Load Regulation
VOUT= 3.30V
TA=25°C
0.8%
0.2%
0.0%
-0.2%
VIN= 4.0V
0.2%
0.0%
-0.2%
-0.4%
-0.4%
VIN= 5.0V
-0.6%
-0.6%
VIN= 5.0V
-0.8%
-0.8%
-1.0%
-1.0%
0.0
0.3
0.6
0.9
1.2
0.0
1.5
0.3
0.6
5%
0.8%
4%
0.6%
3%
0.4%
2%
0.2%
1%
Variation
Variation
1.0%
0.0%
-0.2%
1.5
60
85
0%
-1%
-0.4%
-2%
-0.6%
-3%
-4%
IOUT= 0A
-1.0%
IOUT= 0A
-5%
-40
-15
10
35
60
85
-40
-15
Ambient Temperature (°C)
10
35
Ambient Temperature (°C)
Dropout
Voltage in 100% Duty Cycle Operation
Dropout Voltage of 100% Duty Cycle Operation (MLP)
Dropout
Voltage in 100% Duty Cycle Operation
Dropout Voltage of 100% Duty Cycle Operation (SOT23-5)
500
500
Package: MLPD-UT6
TA= 25°C
450
Package: SOT23-5
TA= 25°C
450
400
400
L= MDT2520-CR1R0M
(DCR= 80m_max)
350
Dropout Voltage (mV)
Dropout Voltage (mV)
1.2
HysteresisVariation
Variation
UVLOUVLO
Hysteresis
Rising Threshold Variation
UVLOUVLO
Rising
Threshold Variation
-0.8%
0.9
Output Current (A)
Output Current (A)
300
250
200
150
100
300
250
200
150
100
L= 1071AS-1R0
(DCR=40m_max)
50
L= MDT2520-CR1R0M
(DCR= 80m_max)
350
L= 1071AS-2R2
(DCR=60m_max)
50
0
0
0.0
0.3
0.6
0.9
1.2
0.0
1.5
Output Current (A)
© 2009 Semtech Corp.
0.3
0.6
0.9
1.2
1.5
Output Current (A)
www.semtech.com
SC189
Typical Waveforms
Circuit Conditions: VOUT=1.5V (SC189HULTRT); L= 2.2uH (TOKO: 1071AS-2R2M); CIN= COUT= 10uF/6.3V (Murata: GRM21BR60J106K).
Output
Voltage
Ripple
(V=1.5V)
OUT=1.5V)
Output
Voltage
Ripple
(VOUT
Output
Voltage
Ripple
(V=1.5V)
OUT=1.5V)
Output
Voltage
Ripple
(VOUT
VOUT
10mV/div
ILX
VOUT
500mA/div
10mV/div
ILX
500mA/div
VLX
VLX
2V/div
2V/div
VIN=5.0V
IOUT=0A
VIN=5.0V
IOUT=1.5A
500ns/div
Output
Voltage
Ripple
(V=1.5V)
OUT=1.5V)
Output
Voltage
Ripple
(VOUT
500ns/div
Output
Voltage
Ripple
(V=1.5V)
OUT=1.5V)
Output
Voltage
Ripple
(VOUT
VOUT
10mV/div
VOUT
10mV/div
ILX
ILX
500mA/div
500mA/div
VLX
VLX
2V/div
2V/div
VIN=3.3V
IOUT=0A
VIN=3.3V
IOUT=1.5A
500ns/div
(VOUT
TransientTransient
ResponseResponse
(VOUT=1.5V;
0A=1.5V)
to 0.5A)
500ns/div
Transient Response
OUT=1.5V)
Transient Response
(VOUT=1.5V;(V0.5A
to 1.0A)
VOUT
VOUT
100mV/div
100mV/div
IOUT
IOUT
500mA/div
500mA/div
VIN=5.0V
IOUT=0A to 0.5A
© 2009 Semtech Corp.
VIN=5.0V
IOUT=0.5A to 1A
50µs/div
50µs/div
www.semtech.com
SC189
Typical Waveforms (continued)
Circuit Conditions: VOUT=1.5V (SC189HULTRT); L= 2.2uH (TOKO: 1071AS-2R2); CIN= COUT= 10uF/6.3V (Murata: GRM21BR60J106K).
Up (VOUT=1.5V)
Start UpStart
(Enable)(V
=1.5V)
OUT
Up (VOUT=1.5V)
Start UpStart
(Enable)(V
=1.5V)
OUT
VIN
VIN
2V/div
2V/div
VEN
VEN
2V/div
2V/div
VOUT
VOUT
1V/div
1V/div
VIN=5.0V
ROUT=1k
VIN=5.0V
ROUT=1
100µs/div
Start
Up (Vup
=1.5V),
OUTV
Start Up
(Power
) (VOUTEN=VIN
=1.5V)
IN
100µs/div
Start
Up (Vup
=1.5V),
OUTV
Start Up
(Power
) (VOUTEN=VIN
=1.5V)
IN
VIN
VIN
2V/div
2V/div
VOUT
VOUT
500mV/div
500mV/div
VIN=5.0V
ROUT=1k
VIN=5.0V
ROUT=1
200µs/div
Start
UpUp
intointo
Pre-Biased
OUT=1.5V) Enable
Start
Pre-Bias Output
Output(V(Enable)
200µs/div
ShutdownShutdown-Disable
(Disable) (VOUT=1.5V)
VIN
2V/div
VIN
2V/div
VEN
2V/div
VEN
2V/div
VOUT
VOUT
500mV/div
500mV/div
VIN=5.0V
ROUT=1k
© 2009 Semtech Corp.
VIN=5.0V
ROUT=1.5
200µs/div
10
50µs/div
www.semtech.com
SC189
Typical Waveforms (continued)
Circuit Conditions: VOUT=3.3V (SC189ZULTRT); L= 2.2uH (TOKO: 1071AS-2R2); CIN= COUT= 10uF/6.3V (Murata: GRM21BR60J106K).
Output
Voltage
Ripple
(V=3.3V)
OUT=3.3V)
Output
Voltage
Ripple
(VOUT
Output
Voltage
Ripple
(V=3.3V)
OUT=3.3V)
Output
Voltage
Ripple
(VOUT
VOUT
10mV/div
VOUT
ILX
10mV/div
500mA/div
ILX
500mA/div
VLX
VLX
2V/div
2V/div
VIN=5.0V
IOUT=0A
VIN=5.0V
IOUT=1.5A
500ns/div
(VOUT
TransientTransient
ResponseResponse
(VOUT=3.3V;
0A=3.3V)
to 0.5A)
500ns/div
Transient Response
OUT=3.3V)
Transient Response
(VOUT=3.3V;(V0.5A
to 1.0A)
VOUT
VOUT
100mV/div
100mV/div
IOUT
IOUT
500mA/div
500mA/div
VIN=5.0V
IOUT=0A to 0.5A
VIN=5.0V
IOUT=0.5A to 1A
50µs/div
Up (VOUT=3.3V)
Start UpStart
(Enable)(V
=3.3V)
OUT
50µs/div
Up (VOUT=3.3V)
Start UpStart
(Enable)(V
=3.3V)
OUT
VIN
VIN
5V/div
5V/div
VEN
VEN
2V/div
2V/div
VOUT
VOUT
1V/div
1V/div
VIN=5.0V
ROUT=1k
© 2009 Semtech Corp.
VIN=5.0V
ROUT=2.2
200µs/div
11
200µs/div
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SC189
Typical Waveforms (continued)
Circuit Conditions: VOUT=3.3V (SC189ZULTRT); L= 2.2uH (TOKO: 1071AS-2R2); CIN= COUT= 10uF/6.3V (Murata: GRM21BR60J106K).
Start
Up (Vup
=3.3V),
OUTV
Start Up
(Power
) (VOUTEN=VIN
=3.3V)
IN
Start
Up (Vup
=3.3V),
OUTV
Start Up
(Power
) (VOUTEN=VIN
=3.3V)
IN
VIN
VIN
2V/div
2V/div
VOUT
VOUT
1V/div
1V/div
VIN=5.0V
ROUT=1k
VIN=5.0V
ROUT=2.2
200µs/div
Start
Up Up
intointo
Pre-Biased
OUT=3.3V)(Enable)
Start
Pre-BiasOutput
Output(V(Enable)
VIN
200µs/div
Start
Pre-Biased
Output (Power
(VOUT=3.3V)(Power
Up)
StartUp
Upinto
into
Pre-Bias Output
Up V )
IN
VIN
2V/div
2V/div
VEN
2V/div
VOUT
VOUT
1V/div
1V/div
VIN=5.0V
ROUT=1k
VIN=5.0V
ROUT=1k
200µs/div
Shutdown-Disable
(VOUT
=3.3V)
Shutdown
(Disable) (VOUT
=3.3V)
200µs/div
Shutdown-Disable
(VOUT
=3.3V)
Shutdown
(Disable) (VOUT
=3.3V)
VIN
VIN
5V/div
5V/div
VEN
VEN
2V/div
2V/div
VOUT
VOUT
2V/div
2V/div
VIN=5.0V
ROUT=33
© 2009 Semtech Corp.
VIN=5.0V
ROUT=3.3
500µs/div
12
100µs/div
www.semtech.com
SC189
Typical Waveforms (continued)
Circuit Conditions: VOUT=1.0V (SC189AULTRT); L= 1uH (Murata: LQM2HPN1R0NG0L); CIN= 10uF/6.3V; COUT= 22uF/6.3V (Murata: GRM21BR60J226M).
Output
Voltage
Ripple
(V=1.0V)
OUT=1.0V)
Output
Voltage
Ripple
(VOUT
Output
Voltage
Ripple
(V=1.0V)
OUT=1.0V)
Output
Voltage
Ripple
(VOUT
VOUT
VOUT
10mV/div
10mV/div
ILX
ILX
500mA/div
Offset: 0A
1A/div
VLX
VLX
2V/div
2V/div
VIN=3.3V
IOUT=0A
VIN=3.3V
IOUT=1.5A
500ns/div
Output
Voltage
Ripple
(V=1.0V)
OUT=1.0V)
Output
Voltage
Ripple
(VOUT
500ns/div
Output
Voltage
Ripple
(V=1.0V)
OUT=1.0V)
Output
Voltage
Ripple
(VOUT
VOUT
VOUT
10mV/div
10mV/div
ILX
ILX
500mA/div
1A/div
VLX
VLX
2V/div
2V/div
VIN=5.0V
IOUT=0A
VIN=5.0V
IOUT=1.5A
500ns/div
Transient
Response
(V=1.0V)
OUT=1.0V)
Transient
Response
(VOUT
500ns/div
Transient
Response
(V=1.0V)
OUT=1.0V)
Transient
Response
(VOUT
VOUT
VOUT
20mV/div
20mV/div
IOUT
IOUT
500mA/div
500mA/div
VIN=5.0V
IOUT=0A to 0.5A
© 2009 Semtech Corp.
VIN=5.0V
IOUT=0.5A to 1A
50µs/div
13
50µs/div
www.semtech.com
SC189
Pin Descriptions
Pin #
(MPLD-UT6)
Pin #
(SOT23-5)
Pin Name
Pin Function
1
Not Available
NC
No connection.
2
3
EN
Enable pin. When connected to logic high or tied to VIN pin, the SC189 is on. When connected to logic low, the device enters shutdown and consumes less than 1µA of current.
The enable pin has a 1 MΩ internal pulldown resistor. This resistor is switched in circuit
whenever the EN pin is below the enable input high threshold, or when the part is in undervoltage lockout.
3
1
VIN
Input power supplies. Powers the internal circuitry and is connected to the source of highside P channel MOSFET.
4
5
LX
Switching node - connect an inductor between this pin and the output capacitor.
5
2
GND
Ground connection.
6
4
VOUT
Output voltage sense pin.
T
Not Available
Thermal Pad
© 2009 Semtech Corp.
Thermal pad for heatsinking purposes. This pad is not connected internally. Connect it to
GND plane.
14
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SC189
Block Diagram
VIN
+
Current Amp
Internal
Oscillator
VOVP
VOUT
Voltage
Select
Plimit
Comp
Plimit
Amp
Ramp
Generator
+
+
+
-
Control
Logic
OVP
Error Amp
LX
+
PWM
Comp
500mV
Ref
GND
EN
© 2009 Semtech Corp.
15
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SC189
Applications Information
Detailed Description
shown above. For programming the output voltage from
other standard voltage, the RFB1, RFB2 and CFF need to be
adjusted to meet the equation shown above.
The SC189 is a synchronous step-down pulse width
modulated (PWM) voltage mode DC-DC regulator
operating at 2.5MHz fixed-frequency. The switching
frequency is chosen to minimize the size of the external
inductor and capacitors while maintaining high
efficiency.
Maximum Power Dissiption of SOT23-5 Package
The maximum power dissiption for junction temperature of less than 125°C on SOT23-5 package is shown
in figure 2. The curve is drawn based on the ΘJA of
90°C/W which is measured in free convection, mounted
on 10mm x 10mm, 2 layer FR4 PCB shown in figure 8
with copper of 1oz for each layer. The maximum power
dissiption may limit the maximum output current over
temperature. The figure 3 and figure 4 show the typical maximum output current for TJ ≤ 125°C over temperature of VIN=5.0V and VIN=3.3V, respectively. If using
inductor with higher loss (i.e., chip inductor), due to
the higher board temperature, the ΘJA will be a little bit
higher.
Operation
During normal operation, the internal highside PMOS device is activated on each rising edge of the internal oscillator.
The voltage
feedback loop uses an internal feedback resistor divider.
The period is set by the on board oscillator when in PWM
mode at average to high loads. The device has an internal
low-side synchronous NMOS device and does not require a
Schottky diode on the LX pin. The device operates as a buck
converter in PWM mode with a fixed frequency of 2.5MHz.
Output Voltage Selection
Protection Features
The SC189 is designed for fixed output voltage. There
are some options for preset output voltage shown in
Table 1. If the voltage desired is not shown in the Table
1, it can be programmed via an external resistor divider. There will be typical 1uA current flowing into the
VOUT pin. The typical schematic of adjustable output
voltage option from the part with standard 1.0V, the
SC189A, is shown in Figure 1. The CFF is needed for maintain the performance of the transient response. The
proper value of CFF can be calculated by the equation
C FF [nF ] = 10 ×
The SC189 provides the following protection features:
Thermal Shutdown
Current Limit
Over-Voltage Protection
Soft-Start Operation
•
•
•
•
Thermal Shutdown
The device has a thermal shutdown feature to protect
the SC189 if the junction temperature exceeds 160°C.
During thermal shutdown, the on-chip power devices
are disabled with the LX output floating. When the die
temperature drops by 10°C, the part will initiate a soft
start recovery to normal operation.
(VOUT − 0.5)2
VOSTD
×(
)
RFB1[kΩ] ⋅ (VOUT − VOSTD ) VOSTD − 0.5
,where the VOSTD is the standard voltage shown in Table 1.
To simplify the design, it is recommended to program the
Current Limit
desired
output
voltage from
1.0V (Std
as shown
in
Schematic
of Adjustable
VOUT standard
from SC189A
VOUT=1.0V)
The internal PMOS power device in the switching stage is
Figure 1 with a proper CFF calculated from the equation
protected by current limit feature. If the output is loaded
L
above the PMOS current limit for 32 consecutive cycles,
V
V
LX
VIN
the SC189 enters foldback current limit mode and the
C
C
R
GND
output current is limited to the current limit holding
C
R
current (ICL_HOLD) of a few hundred milliampere. Under
Enable
EN
VOUT
R
these conditions the output voltage will be the product
RFB1 = (VOUT − 1) × RFB 2
SC189A
of I CL_HOLD and the load resistance. The current limit
holding current (ICL_HOLD) will be decreased when output
Figure 1 — Typical schematic for adjustable output
voltage is increased. The load presented must fall below
voltage option from standard 1.0V of SC189A
OUT
IN
IN
OUT
EN
FB1
FF
FB2
10k
Note: (1) REN is optional.
(2) R =10k and C
© 2009 Semtech
Corp.
FB2
=10nF for standard design.
FF
16
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SC189
Applications Information (continued)
Maximum Power Dissiption for T J  125°C
SOT23-5 Package
the current limit holding current for the SC189 to exit
foldback current limit mode. Figure 5 shows the typical
current limit holding current decreasing rate over different output voltage. The SC189 is capable of sustaining an
indefinite short circuit without damage and will resume
normal operation when the fault is removed. The foldback
current limit mode will be disabled during the soft-start.
1500
Power Dissiption (mW)
1200
900
600
300
JA= 90°C/W
Over-Voltage Protection
0
-40
-25
-10
5
20
35
50
65
80
Ambient Temperature (°C)
95
110 125
In the event of a 15% over-voltage on the output, the
PWM drive is disabled with LX pin floating.
Figure 2 — Maximum power dissiption of SOT23-5
package
over temperature
Maximum Output Current for T  125°C
J
Soft-Start
2.0
1.8
The soft-start mode is activated after VIN reaches its
UVLO and EN signal is set high to enable the part. An over
temperature shutdown event will also activate the soft
start sequence. Soft-start mode controls the maximum
current during startup thus limiting in-rush current. The
PMOS current limit is stepped through four soft start
levels of approximately 20%, 25%, 40%, & 100%. Each
step is maintained for 20μs following internal reference
start up of 20μs giving the total nominal startup period
of 100μs. During startup, the chip operates in controlling
the inductor current swings between 0A and current
limit. If VOUT reaches 90% of the target within the first 2
current levels, the chip continues in hysteretic mode till
the end of the soft-start time period before switching to
PWM mode. If VOUT does not reach 90% by the end of the
second current limit level, soft start will continue to level 3
or level 4 till the output voltage reaches 96% and will then
transition into PWM mode. After the full soft start time
period, the SC189 will switch into PWM mode operation
regardless of the VOUT level.
VOUT=1.2V
Output Current (A)
1.6
1.4
1.2
VOUT=2.5V
1.0
0.8
VOUT= 3.3V
0.6
0.4
VIN= 5.0V
JA= 90°C/W
0.2
0.0
-40
-25
-10
5
20
35
50
65
80
Ambient Temperature (°C)
95
110 125
Figure 3 — Typical maximum output current over
temperature
of SOT23-5 package, VIN= 5.0V
Maximum Output Current for T  125°C
J
2.0
1.8
VOUT=1.2V
Output Current (A)
1.6
1.4
1.2
1.0
0.8
VOUT=2.5V
0.6
0.4
VIN= 3.3V
JA= 90°C/W
0.2
0.0
-40
-25
-10
5
20
35
50
65
80
Ambient Temperature (°C)
95
110 125
Figure 4 — Typical maximum output current over
temperature of SOT23-5 package, VIN= 3.3V
The SC189 is capable of starting up into a pre-biased
output. When the output is precharged by another supply
rail, the SC189 will not discharge the output during the
soft start interval.
Current Limit Holding Current over Vout
150
Current Limit holding Current (mA)
TA= 25°C
120
VIN= 5.0V
Shut Down
90
When the EN pin voltage goes low, the SC189 will run in
shutdown mode, drawing less than 1μA from the input
power supply. The internal switches and bandgap voltage
will be immediately turned off.
60
30
VIN= 3.6V
0
1.0
1.5
2.0
2.5
3.0
3.5
Inductor Selection
Output Voltage (V)
Figure 5 — Current limit holding current decreasing
rate vs. output voltage
© 2009 Semtech Corp.
The SC189 converter has internal loop compensation. The
17
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SC189
Applications Information (continued)
Vout Code (Vout)
A(1.0V),B(1.1V),C(1.2V),E(1.28V),F(1.3V),H(1.5V)
Output Capacitor
Inductor
Description
Vender
Part Number
2.2uH, 60m(max)
Wire Wound
2.8x3.0x1.5(mm)
TOKO
1071AS-2R2N
1.0uH, 40m(max)
Wire Wound
2.8x3.0x1.5(mm)
TOKO
1071AS-1R0N
1.0uH, 80m(max)
Multilayer Chip
2.5x2.0x1.0(mm)
1.0uH, 69m(max)
Multilayer Chip
2.5x2.0x1.0(mm)
TOKO
Murata
Description
MDT2520-CR1R0M
LQM2HPN1R0MG0
Vender
Part Number
Qty.
10uF,6.3V
X5R,0805
Murata
GRM21BR60J106K
1
22uF,6.3V
X5R,0805
Murata
GRM21BR60J226M
1
22uF,6.3V
X5R,0805
Murata
GRM21BR60J226M
1
10uF,6.3V
X5R,0805
Murata
GRM219R60J106K
1
22uF,6.3V
X5R,0805
Murata
GRM21BR60J226M
1
10uF,4.0V
X5R,0603
Murata
GRM188R60G106M
2
Table 2a – Recommended L and output capacitors for Vout=1.0V to 1.5V
Vout Code (Vout)
L(1.8V),N(2.0V),T(Y)(2.5V),V(2.7V),Z(3.3V)
Inductor
Output Capacitor
Description
Vender
Part Number
2.2uH, 60m(max)
Wire Wound
2.8x3.0x1.5(mm)
TOKO
1071AS-2R2N
1.0uH, 40m(max)
Wire Wound
2.8x3.0x1.5(mm)
TOKO
1071AS-1R0N
1.0uH, 80m(max)
Multilayer Chip
2.5x2.0x1.0(mm)
TOKO
Description
MDT2520-CR1R0M
Vender
Part Number
Qty.
10uF,6.3V
X5R,0805
Murata
GRM21BR60J106K
1
22uF,6.3V
X5R,0805
Murata
GRM21BR60J226M
1
22uF,6.3V
X5R,0805
Murata
GRM21BR60J226M
1
10uF,4.0V
X5R,0603
Murata
GRM188R60G106M
2
Table 2b – Recommended L and output capacitors for Vout=1.8V to 3.3V
© 2009 Semtech Corp.
18
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SC189
Applications Information (continued)
compensation is designed to work with a output filter
corner frequency of less than 100kHz over any operating
condition, tolerance and bias effect. The corner frequency
of output filter can be defined by the equation
fC
minimum gap possible to limit the distance that magnetic
fields can radiate from the inductor. However shielded
inductors typically have a higher DCR and are thus less
efficient than a similar sized non-shielded inductor.
1
2S L ˜ COUT
The SC189 is compatible with small shielded chip inductors
for low cost, low profile applications. The inductance roll
off characteristic of chip inductor is worse resulting in
high ripple current and increased output voltage ripple
at heavy load operation. SC189 has OCP peak inductor
current threshold of 2.0A minimum, to support 1.5A DC
load current, the inductor ripple current at 1.5A DC load
current needs to be less than 1A.
Values outside this range may lead to instability,
malfunction, or out-of-specification performance.
When choosing an inductor, it is important to consider
the change in inductance with DC bias current. The
inductor saturation current is specified as the current at
which the inductance drops a specific percentage from
the nominal value. This is approximately 30%. Except for
short-circuit or other fault conditions, the peak current
must always be less than the saturation current specified
by the manufacturer. The peak current is the maximum
load current plus one half of the inductor ripple current at
the maximum input voltage. Load and/or line transients
can cause the peak current to exceed his level for short
durations. Maintaining the peak current below the
inductor saturation specification keeps the inductor ripple
current and the output voltage ripple at acceptable levels.
Manufacturers often provide graphs of actual inductance
and saturation characteristics versus applied inductor
current. The saturation characteristics of the inductor can
vary significantly with core temperature. Core and ambient
temperatures should be considered when examining the
core saturation characteristics.
Final inductor selection depends on various design
considerations such as efficiency, EMI, size, and cost. Table
2a and 2b list the manufacturers of recommended inductor
and output capacitors. Chip inductors provide smaller
footprint and height with lower efficiency and increased
output voltage ripple. Transient load performance is
equivalent to wire wound inductors. Figure 6 shows the
typical efficiency curves for different inductors.
Efficiency
100%
L=1071AS-2R2N (50m_typ)
95%
Efficiency (%)
90%
L=1071AS-1R0N (33m_typ)
80%
L=MDT2520-CR1R0M (60m_typ)
75%
70%
VIN= 5.0V
VOUT= 3.3V
TA=25°C
65%
L=LQM2HP1R0MG0 (55m_typ)
60%
0.0
When the inductance has been determined, the DC
resistance (DCR) must be examined. The efficiency that
can be achieved is dependent on the DCR of the inductor.
The lower values give higher efficiency. The RMS DC
current rating of the inductor is associated with losses in
the copper windings and the resulting temperature rise of
the inductor. This is usually specified as the current which
produces a 40˚C temperature rise. Most copper windings
are rated to accommodate this temperature rise above
maximum ambient.
0.3
0.6
0.9
Output Current (A)
1.2
1.5
Figure 6 — Typical efficiency curves
(VIN=5.0V, VOUT=3.3V)
COUT Selection
The internal voltage loop compensation in the SC189 limits
the minimum output capacitor value to 10μF if using the
inductor of 2.2μH. This is due to its influence on the the
loop crossover frequency, phase margin, and gain margin.
Increasing the output capacitor above this minimum
value will reduce the crossover frequency and provide
greater phase margin. A total output capacintance should
not exceed 30uF to avoid any start-up problems. For most
typical applications, it is recommended to use output
capacitance of 10uF to 22uF. When choosing output
Magnetic fields associated with the output inductor can
interfere with nearby circuitry. This can be minimized by
the use of low noise shielded inductors which use the
© 2009 Semtech Corp.
85%
19
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SC189
Applications Information (continued)
The input capacitor RMS ripple current varies with the
input and output voltage. The maximum input capacitor
RMS current is found from the equation
capacitor’s capacitance, verify the voltage derating effect
from the capacitor vendors data sheet.
Capacitors with X7R or X5R ceramic dielectric are
recommended for their low ESR and superior temperature
and voltage characteristics. Y5V capacitors should not
be used as their temperature coefficients make them
unsuitable for this application.
I CIN ( RMS ) =
The output capacitor RMS current ripple may be calculated from the equation
1  VOUT ⋅ (VIN ( MAX ) − VOUT )


=
L ⋅ f OSC ⋅ VIN
2 3 

Table 3 lists the manufacturers of recommended output
capacitor options.
CIN Selection
Type
Rated
Voltage
(VDC)
Value
at
3.3V
(μF)
Dimensions
LxWxH
(mm)
10±10%
X5R
10
4.42
2.0x1.25x1.25
(EIA:0805)
Murata
GRM21BR71A106K
10±10%
X7R
10
4.88
2.0x1.25x1.25
(EIA:0805)
Murata
GRM21BR60J106K
10±10%
X5R
6.3
4.05
2.0x1.25x1.25
(EIA:0805)
Murata
GRM21BR70J106K
10±10%
X7R
6.3
4.91
2.0x1.25x1.25
(EIA:0805)
Murata
GRM21BR60J226M
22±20%
X5R
6.3
6.57
2.0x1.25x1.25
(EIA:0805)
Manufacturer
Part Nunber
Value
(μF)
Murata
GRM21BR61A106K
Table 3 – Recommended Capacitors
The SC189 source input current is a DC supply current
with a triangular ripple imposed on it. To prevent large
input voltage ripple, a low ESR ceramic capacitor is
required. A minimum value of 4.7μF should be used. It is
important to consider the DC voltage coefficient characteristics when determining the actual required value. To
estimate the required input capacitor, determine the
acceptable input ripple voltage and calculate the
minimum value required for CIN from the equation
C IN



The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the PMOS switch.
Low ESR/ESL X5R ceramic capacitors are recommended
for this function. To minimise stray inductance ,the
capacitor should be placed as closely as possible to the
VIN and GND pins of the SC189.
3 ⋅ ∆I LOAD
VDROOP ⋅ f OSC
I COUT ( RMS )
 VOUT
1 −
VIN

The input voltage ripple and RMS current ripple are at
maximum when the input voltage is twice the output
voltage or 50% duty cycle.
The output voltage droop due to a load transient is
determined by the capacitance of the ceramic output
capacitor. The ceramic capacitor supplies the load current
initially until the loop responds. Within a few switching
cycles the loop will respond and the inductor current will
increase to match the required load. The output voltage
droop during the period prior to the loop responding
can be related to the choice of output capacitor by the
relationship.
COUT =
VOUT
VIN
 VOUT 
1 −

VIN 

=

 ∆V

− ESR  ⋅ f OSC
 I OUT

VOUT
VIN
© 2009 Semtech Corp.
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SC189
Applications Information (continued)
PCB Layout Considerations
The layout diagram in figure 7 and figure 8 shows a
recommended PCB for MLPD-UT6 2x2 and SOT23-5
package, respectively. Fundamental layout rules must
be followed since the layout is critical for achieving the
performance specified in the Electrical Characteristics
table. Poor layout can degrade the performance of the DCDC converter and can contribute to EMI problems, ground
bounce, and resistive voltage losses. Poor regulation and
instability can result.
L
CIN
COUT
VOUT
U1
GND
VIN
GND
EN
(a) Top layer for MLPD-UT6 2x2 package
The following guidelines are recommended when
developing a PCB layout:
1. The input capacitor, CIN should be placed as close to the
VIN and GND pins as possible. This capacitor provides
a low impedance loop for the pulsed currents present
at the buck converter’s input. Use short wide traces
to connect as closely to the IC as possible. This will
minimize EMI and input voltage ripple by localizing
the high frequency current pulses.
2. Keep the LX pin traces as short as possible to minimize
pickup of high frequency switching edges to other
parts of the circuit. COUT and L should be connected as
close as possible between the LX and GND pins, with
a direct return to the GND pin from COUT.
3. Route the output voltage feedback/sense path away
from inductor and LX node to minimize noise and
magnetic interference.
4. Use a ground plane referenced to the SC189 GND pin.
Use several vias to connect to the component side
ground to further reduce noise and interference on
sensitive circuit nodes.
5. If possible, minimize the resistance from the VOUT and
GND pins to the load. This will reduce the voltage drop
on the ground plane and improve the load regulation.
And it will also improve the overall efficiency by
reducing the copper losses on the output and ground
planes.
GND
GND
(b) Bottom layer for MLPD 2x2 package
Figure 7 — Recommended PCB Top & Bottom Layer
Layout for MLPD-UT6 2x2 Package
L
VOUT
CIN
COUT
U1
GND
VIN
(a) Top layer for SOT23-5 package
GND
EN
(b) Bottom layer for SOT23-5 package
Figure 8 — Recommended PCB Top & Bottom Layer
Layout for SOT23-5 Package
© 2009 Semtech Corp.
21
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SC189
Outline Drawing – 2x2 MLPD-UT6
A
DIMENSIONS
INCHES
MILLIMETERS
DIM
MIN NOM MAX MIN NOM MAX
B
D
A
A1
A2
b
D
D1
E
E1
e
L
N
aaa
bbb
E
PIN 1
INDICATOR
(LASER MARK)
A2
A
SEATING
PLANE
aaa C
C
A1
.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
.018
.000
0.60
0.05
(0.1524)
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
0.45
0.00
D1
2
1
LxN
E1
N
bxN
bbb
e
C A B
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
Land Pattern – 2x2 MLPD-UT6
H
R
DIM
(C)
G
K
C
G
H
K
P
R
X
Y
Z
Z
Y
P
X
DIMENSIONS
INCHES
MILLIMETERS
(.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:
© 2009 Semtech Corp.
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.
22
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SC189
Outline Drawing – SOT23-5
Land Pattern – SOT23-5
X
DIMENSIONS
DIM
(C)
G
C
G
P
X
Y
Z
Z
Y
P
MILLIMETERS
(2.50)
1.40
0.95
0.60
1.10
3.60
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.
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
© 2009 Semtech Corp.
23
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