Datasheet UM3510 Rev01

UM3510
1A, 2.25MHz, Synchronous Step-Down DC-DC Converter
UM3510S SOT23-6
UM3510DA DFN6 2.0×2.0
General Description
The UM3510 is a high efficiency pulse-width-modulated (PWM) synchronous step-down DC-DC
converter with an input voltage range of 2.5V to 6.0V. It provides up to 1000mA output current
from a single Li-ion cell. The UM3510 operates at 2.25MHz fixed switching frequency and enters
Power Save Mode to maintain high efficiency at light load condition.
For low noise applications, the device can be forced into fixed frequency PWM mode by pulling
the MODE pin high.
The UM3510 enters shutdown mode and consumes less than 1μA when EN pin is pulled low.
Other features include lower internal reference voltage with 2% accuracy, over temperature
protection and over current protection.
The UM3510 is available in SOT23-6 and 2mm×2mm 6-pin DFN packages.
Applications
Features










Cellular and Smart Phones
Microprocessors and DSP Core
Supplies
Wireless and DSL Modems
PDAs, GPS
WLAN
Portable Instruments
High Efficiency: Up to 95%
2.25MHz Constant Switching Frequency
1000mA Output Current
Integrated Main Switch and Synchronous
Rectifier. No Schottky Diode Required.
2.5V to 6.0V Input Voltage Range
Low Quiescent Current: 56µA
Thermal Fault Protection
<1µA Shutdown Current




Typical Application Circuit
L1
2.2µH
VIN 2.5V to 6V
VIN
SW
R1
360kΩ
EN
CIN
10µF
VOUT 1.8V,
1000mA
C1
22pF
UM3510
GND
MODE
FB
R2
180kΩ
Top View
6
FB 1
6
EN
MODE 2
5
VIN
SW 3
4
GND
5
UCB
1
2
4
M
Pin Configurations
COUT
10µF
3
M: Month Code
UM3510S
SOT23-6
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UM3510
SW
Top View
1
MODE
2
FB
3
Exposed
Thermal
Pad
6
GND
5
VIN
4
EN
AAH
M
Pin Configurations
M: Month Code
UM3510DA
DFN6 2.0×2.0
(Top View)
Ordering Information
Part Number
Packaging Type
Marking Code
Shipping Qty
UM3510S
SOT23-6
UCB
UM3510DA
DFN6 2.0×2.0
AAH
3000pcs/7Inch
Tape & Reel
Pin Description
Pin Number
Symbol
Function
1
SW
2
MODE
3
FB
4
EN
5
VIN
Input voltage.
6
GND
Ground.
Power switch output. It is the switch node connection to the inductor.
This pin connects to the drains of the internal P-CH and N-CH
MOSFET switches.
MODE pin=high forces the device to operate in fixed-frequency
PWM mode. Mode pin=low enables the Power Save Mode with
automatic transition from PFM mode to fixed-frequency PWM
mode.
Feedback input pin. Connect FB to the center point of the external
resistor divider.
Regulator enable control input. Pulling this pin to high enables the
device. Pulling this pin to low forces the device into shutdown
mode. This pin must be terminated.
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UM3510
Absolute Maximum Ratings (Note 1)
Symbol
Value
Unit
-0.3 to +7.0
V
EN, FB Voltages
-0.3 to VIN+0.3
V
VSW
SW Voltage
-0.3 to VIN+0.3
V
ISW
Peak SW Sink and Source Current
2.0
A
TO
Operating Temperature
-40 to +85
°C
Storage Temperature Range
-65 to +150
°C
VIN
VEN,VFB
TSTG
Parameter
Input Voltage
Note 1: Stresses greater than those listed under Maximum Ratings may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections of this specification
is not implied. Exposure to absolute maximum rating conditions for extended periods
may affect reliability.
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UM3510
Electrical Characteristics
(VIN=VEN=3.6V, TA=+25ºC, unless otherwise noted)
Symbol
Parameter
Test Conditions
SUPPLY
VIN
Input Voltage Range
Under Voltage Lockout
UVLO
Falling Edge
Threshold
Under Voltage Lockout
UVLO_HYS
Hysteresis
Input DC Supply
ILOAD=0mA
Current (MODE=GND)
IQ
Input DC Supply
ILOAD=0mA
Current (MODE=VIN)
Input Supply Current
ISD
VFB=0V, VIN=6.0V
(Shutdown Mode)
OUTPUT
Regulated Feedback
VFB
TA=+25ºC
Voltage
IFB
FB Input Bias Current
VFB=0.65V
2.5V≤VIN≤6.0V,
Output Voltage Line
IOUT=10mA,
Regulation
MODE=VIN/GND
Output Voltage Load
0.1A≤IOUT≤1A
Regulation
Maximum Output
IO(MAX)
Current
tSS
Soft Start Time
VEN=0V, VIN=6V,
ISWL
SW Leakage
VSW=0V or 6V
POWER SWITCH
RDS(ON) of P-CH
VIN=3.6V,
MOSFET
ISW=100mA
RDS(ON)
RDS(ON) of N-CH
VIN=3.6,
MOSFET
ISW=-100mA
IP
Peak Inductor Current
VIN=2.5V to 6.0V
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
OSILLATOR
f
Oscillator Frequency
ENABLE, MODE
VIH
High-Level Threshold
VIL
Low-Level Threshold
II
Input Leakage Current
Min
Typ
Max
Unit
2.5
6.0
V
1.8
2.3
V
200
56
mV
80
5.6
0.588
mA
0.1
1.0
μA
0.600
0.612
V
30
nA
0.20
%/V
0.10
0.5
%/A
1000
mA
μs
400
1.6
1.95
μA
±0.01
±1
μA
0.25
0.30
Ω
0.18
0.23
Ω
1.8
2.0
A
150
ºC
20
ºC
2.25
2.55
MHz
0.4
1
V
V
μA
1.2
0.1
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UM3510
Typical Operating Characteristics
Efficiencyvs.
vs.Load
Load Current
Current
Efficiency
Vout=1.8V,
ForcedPWM
PWM Mode
Mode
VOUT
=1.8V, Forced
100
100
90
90
80
80
70
70
Ef f iciency (%)
Ef f iciency (%)
Efficiencyvs.
vs. Load
Load Current
Efficiency
Current
Power Save
Save Mode
VVout=1.8V,
Mode
OUT=1.8V, Power
60
50
40
VIN=2.5V
VIN=2.5V
VIN=3.6V
VIN=3.6V
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
30
20
10
60
50
40
VIN=2.5V
VIN=2.5V
VIN=3.6V
VIN=3.6V
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
30
20
10
0
0
1
10
100
Output Current (mA)
1
1000
100
100
90
90
80
80
70
70
60
50
40
30
VVIN=3.6V
IN=3.6V
VVIN=4.2V
IN=4.2V
VVIN=6.0V
IN=6.0V
20
10
60
50
40
30
VIN=3.6V
VIN=3.6V
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
20
10
0
0
1
10
100
Output Current (mA)
1000
1
Output Voltage
Voltage vs.
Output
vs. Load
LoadCurrent
Current
V
Vout=1.8V,Mode=L
OUT=1.8V, MODE=L
1.840
1.840
1.835
1.835
1.830
1.825
1.820
VIN=2.5V
VIN=2.5V
VIN=3.6V
VIN=3.6V
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
1.815
10
100
Output Current (mA)
1.830
1.825
1.820
VIN=2.5V
VIN=2.5V
VIN=3.6V
VIN=3.6V
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
1.815
1.810
1.810
1
10
100
Output Current (mA)
1000
OutputVoltage
Voltage vs. Load
Output
LoadCurrent
Current
VOUT=1.8V, MODE=H
Vout=1.8V,Mode=H
Output Voltage (V)
Output Voltage (V)
1000
Efficiency
vs.
Efficiency
vs.Load
LoadCurrent
Current
VOUT
=3.3V, Forced
Vout=3.3V,
ForcedPWM
PWMMode
Mode
Ef f iciency (%)
Ef f iciency (%)
Efficiency vs.
vs. Load
Load Current
Efficiency
Current
Power Save Mode
VVout=3.3V,
Mode
OUT=3.3V, Power
10
100
Output Current (mA)
1000
1
10
100
Output Current (mA)
1000
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UM3510
Typical Operating Characteristics (Continued)
Output
Load Current
Current
OutputVoltage
Voltage vs.
vs. Load
VOUT=3.3V, MODE=H
Vout=3.3V,
Mode=H
3.340
3.340
3.330
3.330
Output Voltage (V)
Output Voltage (V)
Output Voltage
Output
Voltagevs.
vs.Load
LoadCurrent
Current
VVout=3.3V,
OUT=3.3V, MODE=L
Mode=L
3.320
3.310
3.300
3.290
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
3.280
3.320
3.310
3.300
3.290
VIN=4.2V
VIN=4.2V
VIN=6.0V
VIN=6.0V
3.280
3.270
3.270
1
10
100
Output Current (mA)
1000
1
1000
OutputVoltage
Voltage vs.
Output
vs. Temperature
Temperature
VIN=3.6V, MODE=H,
LOAD=10mA
Vin=3.6V,
Mode=H, IIload=10mA
1.825
1.820
1.820
Output Voltage (V)
1.825
1.815
1.810
1.805
1.800
1.815
1.810
1.805
1.800
1.795
1.795
-40
-15
10
35
Temperature (°C)
60
85
-40
Supply Current
Currentvs.
vs.Supply
Supply
Voltage
Voltage
PowerSave
SaveMODE,
Mode,Mode=L
MODE=L
Power
-15
10
35
Temperature (°C)
60
85
Supply
SupplyVoltage
Voltage
SupplyCurrent
Current vs. Supply
ForcedPWM
PWM Mode,
MODE, MODE=H
Mode=H
Forced
80
10
70
8
Supply Current (mA)
Supply Current (μA)
Output Voltage (V)
OutputVoltage
Voltagevs.
vs.Temperature
Temperature
Output
VIN=3.6V,Mode=L,
MODE=L,Iload=10mA
ILOAD=10mA
Vin=3.6V,
10
100
Output Current (mA)
60
50
40
6
4
2
30
0
20
2.5
3
3.5
4
4.5
5
Supply Voltage (V)
5.5
6
2.5
3
3.5
4
4.5
5
5.5
6
Supply Voltage (V)
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UM3510
Typical Operating Characteristics (Continued)
Frequency vs.
Supply Voltage
Frequency
vs. Supply
Voltage
VVout=1.8V,
ILOAD=200mA
OUT=1.8V, Iload=200mA
70
2600
65
2500
Frequency (kHz)
Supply Current (μA)
SupplyCurrent
Currentvs.
vs. Temperature
Temperature
Supply
MODE=L
VVIN=6V,
IN=6V, MODE=L
60
55
50
45
2400
2300
2200
2100
2000
1900
40
-50
-25
0
25
50
Temperature (°C)
75
100
2.5
125
3.5
4
4.5
5
5.5
6
Supply Voltage (V)
vs.Input
InputVoltage
Voltage
H-Side Rds(on)
RDS(ON) vs.
L-Side
RDS(ON) vs.
L-Side Rds(on)
vs.Input
InputVoltage
Voltage
0.35
0.40
0.30
0.35
0.30
RDS(ON) (Ω)
0.25
RDS(ON) (Ω)
3
0.20
0.15
0.10
0.25
0.20
0.15
0.10
0.05
0.05
0.00
0.00
2.5
3.0
3.5
4.0
Input Voltage (V)
4.5
5.0
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
5.0
5.5
6.0
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UM3510
Typical Operating Characteristics (Continued)
Load Transient Response
Load Transient Response
VIN=2.5V, VOUT=1.8V, MODE=L
VIN=2.5V, VOUT=1.8V, MODE=H
VOUT
VOUT
200mV/div
200mV/div
ILOAD=850mA
ILOAD
ILOAD=50mA
500mA/div
ILOAD=850mA
ILOAD=50mA
ILOAD
100μs/div
500mA/div
Line Transient Response
ILOAD=50mA
100μs/div
Line Transient Response
VIN=3.5V to 4.5V, VOUT=1.8V, ILOAD=50mA,
MODE=L
VIN
ILOAD=50mA
VIN=3.5V to 4.5V, VOUT=1.8V, ILOAD=50mA,
MODE=H
VIN
2.0V/div
2.0V/div
VOUT
VOUT
100μs/div
20mV/div
20mV/div
PFM Mode Operation
PWM Mode Operation
VIN=3.6V, VOUT=1.8V, ILOAD=10mA, MODE=L
VOUT
100μs/div
VIN=3.6V, VOUT=1.8V, ILOAD=10mA, MODE=H
VOUT
20mV/div
20mV/div
VSW
VSW
2.0V/div
50μs/div
2.0V/div
1.0μs/div
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UM3510
Application Information
Output Voltage Setting
The output voltage can be caculated according to the formula below with an internal reference
volatge VREF typical 0.6V:
R1
VOUT = VREF × 1 +
R2
To minimize the current through the feedback divider network, the recommended value of R2 is
about 180kΩ. The sum of R1 and R2 should not exceed about 1MΩ to keep the network robust
against noise. An external feed forward capacitor C1 is required for optimum load transient
response. The value of C1 should be in the range between 10pF and 33pF.
Route the FB line away from noise sources, such as the inductor or the SW line.
Inductor Selection
A 1µH to 10µH inductor with DC current rating at least 25% higher than the maximum load
current is recommended for most applications. For best efficiency, the inductor DC resistance
shall be <200mΩ.
For most designs, the inductance value can be derived from the following equation:
VOUT × VIN − VOUT
L=
VIN × ∆IL × fOSC
Where ∆IL is the inductor ripple current. Choose inductor ripple current approximately 30% of the
maximum load current, 1000mA.
The maximum inductor peak current is:
∆IL
IL MAX = ILOAD +
2
The following table is a list of recommended inductors.
3
Dimension [mm ]
4.5×4×3.2
3×3×1.5
3×3×1.5
List of Recommended Inductors
Inductor Type
Supplier
744773022
Würth Elektronik
LQH3NPN2R2NM0
MURATA
LPS3015
Coilcraft
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the
device. The input capacitor impedance at the switching frequency shall be less than the input
source impedance to prevent high frequency switching current passing to the input. Ceramic
capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and
small temperature coefficients. For most applications, a 10µF capacitor is sufficient. The input
capacitor can be increased without any limit for better input voltage filtering.
Output Capacitor Selection
The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The
output capacitor impedance shall be low at the switching frequency. Ceramic capacitor with X5R
or X7R dielectrics are recommended. The output ripple ∆VOUT is approximately:
VOUT × VIN − VOUT
1
∆VOUT ≤
× ESR +
VIN × fOSC × L
8 × fOSC × COUT
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UM3510
Layout Guidance
When laying out the PC board, the following suggestions should be taken to ensure proper
operation of the UM3510.
1. The power traces, including the GND trace, the SW trace and the VIN trace should be kept
short, direct and wide to allow large current flow.
2. Connect the input capacitor CIN to the VIN pin as closely as possible to get good power filter
effect.
3. Keep the switching node, SW, away from the sensitive FB node.
4. Do not trace signal line under inductor.
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UM3510
Package Information
UM3510S: SOT23-6
Outline Drawing
D
5
4
1
2
3
L
L1
E
E1
6
Symbol
θ
b
e
c
e1
0.20
Top View
A
A2
A1
End View
Side View
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
θ
DIMENSIONS
MILLIMETERS
Min
Max
1.05
1.25
0.00
0.10
1.05
1.15
0.30
0.50
0.10
0.20
2.82
3.02
1.50
1.70
2.65
2.95
0.95REF
1.80
2.00
0.60REF
0.30
0.60
0°
8°
INCHES
Min
Max
0.041 0.049
0.000 0.004
0.041 0.045
0.012 0.020
0.004 0.008
0.111 0.119
0.059 0.067
0.104 0.116
0.037REF
0.071 0.079
0.023REF
0.012 0.024
0°
8°
Land Pattern
2.4
0.9
0.7
0.95
0.95
NOTES:
1. Compound dimension: 2.92×1.60;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
UCB
M
Tape and Reel Orientation
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UM3510
UM3510DA DFN6 2.0×2.0
Outline Drawing
Symbol
D2
E
E2
L
D
A
0.57
-
0.80
0.022
-
0.031
A1
0.00
-
0.05
0.000
-
0.002
A3
Pin #1 ID
b
PIN 1 DOT
BY MARKING
DIMENSIONS
INCHES
MILLIMETERS
Typ
Max
Min Typ Max Min
Top View
0.20REF
0.008REF
b
0.25
0.30
0.35
0.010
0.012
0.014
D
1.95
2.00
2.075
0.077
0.079
0.082
D2
1.05
-
1.75
0.041
-
0.069
E
1.95
2.00
2.075
0.077
0.079
0.082
E2
0.45
-
1.06
0.018
-
0.042
e
A1
A
A3
Bottom View
Side View
e
L
0.65BSC
0.25
-
0.026BSC
0.45
0.010
-
0.018
0.25
Land Pattern
2.00
0.96
0.57
2.00
2.50
1.65
0.65
0.35
NOTES:
1. Compound dimension: 2.00×2.00;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
AAH
M
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UM3510
GREEN COMPLIANCE
Union Semiconductor is committed to environmental excellence in all aspects of its
operations including meeting or exceeding regulatory requirements with respect to the use
of hazardous substances. Numerous successful programs have been implemented to
reduce the use of hazardous substances and/or emissions.
All Union components are compliant with the RoHS directive, which helps to support
customers in their compliance with environmental directives. For more green compliance
information, please visit:
http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be
accurate. Nonetheless, this document is subject to change without notice. Union assumes
no responsibility for any inaccuracies that may be contained in this document, and makes
no commitment to update or to keep current the contained information, or to notify a
person or organization of any update. Union reserves the right to make changes, at any
time, in order to improve reliability, function or design and to attempt to supply the best
product possible.
Union Semiconductor, Inc
Add: Unit 606, No.570 Shengxia Road, Shanghai 201210
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
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