500-mA - Adjustable Boost Converter for Single or Dual Cell
DESCRIPTION
SiP12503 is a boost converter IC with adjustable output
voltage for single or dual cell NiMH or Alkaline battery pack.
Featuring with an internal low resistance power MOSFET, it
is capable of starting up with a low battery voltage of 0.85 V.
It only needs six external components (an inductor, a diode,-
two capacitors and two resistors) to construct a step-up
converter. For best efficiency performance, it is designed to
operate in PWM mode with 300 kHZ switching frequency
under normal load and in PFM mode under light load. The
voltage-mode control loop is internally compensated,
simplifying converter design and reducing external parts
count. It accepts input voltages from 0.85 V to 5.0 V, and
adjustable output voltages from 2 V to 5 V. It also features
low shutdown current of under 1 µA, over voltage protection,
thermal shutdown protection, and antiring control to minimize
EMI.
SiP12503 is available in a lead (Pb)-free 6 pin, PowerPAK
MLP33 package and is specified to operate over the
industrial temperature range of - 40 °C to 85 °C.
FEATURES
• Voltage mode control with internal frequency
compensation
• 0.85 V to 5.0 V input voltage range
• Adjustable output voltage range from 2.0 V to 5.0 V
• Low startup voltage: 0.65 V
• PWM control with 300 kHz fixed switching frequency
• PFM control for light load
• Powered from the output voltage supply
• Integrated UVLO and soft-start
• Logic controlled shutdown (< 1 µA)
• 85 % typical efficiency
• Internal power MOS switch: 0.2
Ω
at 3.3 V output
• Antiringing switch to minimize EMI
• Shutdown input
• Thermal shutdown
• Minimum external components
• PowerPAK
®
MLP33-6 package (DFN-6, 3 x 3)
• Over voltage protection
APPLICATIONS
•
•
•
•
•
•
Portable applications
Battery-powered equipment
Handheld devices
Digital cameras
Wireless handsets
LCD and OLED bias
TYPICAL APPLICATION CIRCUIT
V
IN
10 µH
10 µF
2
V
IN
XSHD
1
XSHD
LX
6
MBR0520
V
OUT
47 µF
SiP12503
3
V
OUT
GND
5
FB
450 KΩ
4
100 KΩ
Document Number: 73579
S09-1454-Rev. B, 03-Aug-09
www.vishay.com
1
SiP12503
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
(all voltages referenced to GND = 0 V)
Parameter
Input Voltage, V
IN
LX Voltage
Output Voltage, V
OUT
XSHD Voltage
FB Voltage
Maximum Junction Temperature
Storage Temperature
Operating Junction Temperature
Power Dissipation
a
Thermal Resistance
b
PowerPAK MLP33-6 (T
A
= 70 °C)
a
PowerPAK MLP33-6
Limit
- 0.3 to 6
- 0.3 to V
OUT
+ 0.5
- 0.3 to 6
- 0.3 to V
IN
+ 0.5
- 0.3 to 6
150
- 55 to 150
125
1100
50
mW
°C/W
°C
V
Unit
Notes:
a. Derate 20 mW/°C above 70 °C.
b. Device mounted with all leads soldered or welded to PC board.
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.
RECOMMENDED OPERATING RANGE
(all voltages referenced to GND = 0 V)
Parameter
Input Voltage, V
IN
Output Voltage, V
OUT
XSHD Voltage
LX Voltage
FB Voltage
Operating Temperature Range
Limit
0.85 to 5.0
2.0 to 5
0 to V
IN
0 to V
OUT
+ 0.5
0 to 5 V
OUT
- 40 to 85
°C
V
Unit
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
Minimum Start-Up Voltage
Minimum Operating Voltage
d
UVLO
UVLO Hysteresis
Symbol
V
START
V
HOLD
V
UVLO
V
UVLOHYST
V
IN
= 1.2 V, V
OUT
= V
nom
e
,
Limits
Temp.
Full
a
T
A
= 25 °C
Min.
b
Typ.
c
0.65
0.55
Max.
b
0.85
Unit
I
LOAD
= 1 mA
XSHD = V
IN
Rising V
OUT
Full
Full
- 1.5
- 25 to
85 °C
Full
1.8
0.100
2
+ 1.5
+ 3.0
+ 3.5
V
FB Voltage Accuracy
V
FB
- 3.0
- 3.5
1
80
225
87
300
%
Feedback Input Current
Maximum PWM Duty Cycle
PWM Switching Frequency
I
FB
MAXDTY
f
OSC
V
FB
= 0.6 V
Full
Full
nA
%
375
kHz
www.vishay.com
2
Document Number: 73579
S09-1454-Rev. B, 03-Aug-09
SiP12503
Vishay Siliconix
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
Supply Current 1
Supply Current 2
Supply Current 3
Stand-By Current
NMOS Switch Leakage
NMOS Switch On Resistance
PWM to PFM Current Threshold
PFM to PWM Current Threshold
XSHD Input High Level
XSHD Input Low Level
Softstart Time
Over Voltage Threshold
Over Voltage Hysteresis
Thermal Shutdown
Thermal Shutdown Hysteresis
I
STB
I
LEAK
R
DS(on)
I
WTOF
I
FTOF
0.8 V
≤
V
IN
≤
0.9 V
V
XSHDH
V
XSHDL
t
START
V
OV
V
OVHYST
T
SHD
T
HYST
V
iN
= 1.8 V
0.9 V< V
IN
≤
2 V
2 V < V
IN
≤
5 V
Full
Full
Full
Full
1.6
110
10
160
20
0.55
0.8
1.2
0.2
ms
%
°C
V
OUT
Symbol
V
IN
= 1.2 V, V
OUT
= V
nom
T
A
= 25 °C
V
OUT
= V
nom
X 0.95
V
OUT
= V
nom
+ 0.5 V, V
LX
> V
IN
V
OUT
= V
nom
+ 0.5 V, V
LX
< V
IN
XSHD = 0 V, not including switch leakage
LX = 5 V
V
OUT
= 3.3 V
Full
1
Full
0.2
3
22
e
,
Limits
Temp.
a
Min.
b
Typ.
c
330
134
44
1
2
10
Ω
mA
µA
Max.
b
450
Unit
Notes:
a. Full = - 40 °C to 85 °C.
b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum (- 40 °C to 85 °C).
c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
d. Minimum operating voltage is determined by the battery’s capability to provide energy as it is deeply discharged.
e. Vnom equals programmed output voltage.
Document Number: 73579
S09-1454-Rev. B, 03-Aug-09
www.vishay.com
3
SiP12503
Vishay Siliconix
PIN CONFIGURATION AND TRUTH TABLE
PowerPAK MLP33-6
XSHD
1
6
LX
V
IN
2
5
GND
V
OUT
3
4
FB
Top View
ORDERING INFORMATION
Part Number
SiP12503DMP-T1-E3
Temperature Range
- 40 °C to 85 °C
Marking
2503
PIN DESCRIPTION
Pin Number
1
2
3
4
5
6
Name
XSDH
V
IN
V
OUT
FB
GND
LX
Input voltage
Output of the boost converter and power source for the IC-battery
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