LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
500mA Output Current
Low Noise Dual Mode
Step-Up Charge Pumps
DESCRIPTIO
The LTC
®
3203/LTC3203-1/LTC3203B/LTC3203B-1 are low
noise, high efficiency charge pump DC/DC converters
capable of driving loads up to 500mA from a 2.7V to 5.5V
input. Low external parts count (two flying capacitors and
bypass capacitors at V
IN
and V
OUT
) make the LTC3203
family ideally suited for small, battery-powered applica-
tions.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. High switching frequency enables
the use of small external capacitors. The LTC3203/
LTC3203-1 feature Burst Mode operation at light load to
achieve high efficiency whereas the LTC3203B/
LTC3203B-1 operate at constant frequency to achieve
lowest noise operation.
The LTC3203-1/LTC3203B-1 have a user selectable fixed
output voltage of 4.5V or 5V to power LEDs or logic
circuits. The FB pin of the LTC3203/LTC3203B can be used
to program the desired output voltage. The parts are short-
circuit and overtemperature protected and are available in
a low profile (3mm
×
3mm) DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6411531.
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
■
Selectable Dual Mode Operation: 1:1.5 or 1:2
High Output Current: Up to 500mA
Low Noise Constant Frequency (1MHz/0.9MHz)
Operation*
V
IN
Range: 2.7V to 5.5V
Adjustable Output Voltage (LTC3203/LTC3203B)
User Selectable Fixed Output Voltages: 4.5V or 5V
(LTC3203-1 and LTC3203B-1)
Burst Mode
®
Operation with
I
Q
~ 120µA (LTC3203/LTC3203-1)
Constant Freqency Operation at All Loads
(LTC3203B/LTC3203B-1)
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit/Thermal Protection
Shutdown Disconnects Load from Input
Shutdown Current: < 1µA
Available in a 10-pin (3mm
×
3mm) DFN Package
APPLICATIO S
■
■
■
■
High Current LED Backlight Supply for
Cellphones/PDAs
Cellphone Camera Light Supply
General Purpose 3.3V or Li-Ion to 5V Supply
USB ON THE GO(OTG) Devices
TYPICAL APPLICATIO
ON/OFF
Efficiency vs V
IN
at 300mA Load Current
100
OUTPUT PROGRAMMING
90
80
V
OUT
500mA
10µF
2.2µF
EFFICIENCY (%)
70
60
50
40
30
3203 F02
SHDN V
SEL
LTC3203-1
V
IN
2.2µF
2.2µF
R1*
V
IN
C1+
C1–
MODE
100k
I
OUT(MAX)
V
SEL
V
OUT
300mA
300mA
500mA
500mA
LOW 4.5V
HIGH 5V
LOW 4.5V
HIGH 5V
V
OUT
C2+
C2–
GND
*R1
316k
357k
357k
402k
20
10
0
2.5
3
3.5
4
V
IN
(V)
4.5
5
5.5
3203 G05
U
U
U
V
OUT
= 5V
V
OUT
= 4.5V
32031fa
1
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C2
+
V
OUT
C1
+
SHDN
V
SEL
/FB*
1
2
3
4
5
11
V
IN
, V
OUT
to GND ......................................... –0.3V to 6V
MODE, V
SEL
/FB, SHDN ..................... –0.3V to V
IN
+0.3V
V
OUT
Short Circuit Duration ............................. Indefinite
I
OUT
(Note 2)....................................................... 500mA
Operating Temperature Range (Note 3) ... –40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
10 C1
–
9 GND
8 C2
–
7 V
IN
6 MODE
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,θ
JA
= 44°C/W,θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
*V
SEL
ON LTC3203-1/LTC3203B-1. FB ON LTC3203/LTC3203B
ORDER PART NUMBER
LTC3203EDD
LTC3203EDD-1
LTC3203BEDD-1
LTC3203BEDD
DD PART MARKING
LBQK
LCFH
LCGY
LCGX
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
●
denotes specifications which apply over the full specified temperature
range, otherwise specifications are at 25°C. V
IN
= 3.6V, C1 = C2 = 2.2
µ
F unless otherwise specified.
SYMBOL
V
IN
I
SHDN
R
OL
f
OSC
V
MODEH
V
MODEL
V
SHDNH
V
SHDNL
I
MODEH
I
MODEL
I
SHDNH
I
SHDNL
PARAMETER
Input Voltage Range
Shutdown Current
Open Loop Output
Impedance
CLK Frequency
MODE Input High Voltage
MODE Input Low Voltage
SHDN Input High Voltage
SHDN Input Low Voltage
MODE Input High Current
MODE Input Low Current
SHDN Input High Current
SHDN Input Low Current
SHDN = 0V, V
OUT
= 0V
2x Mode (Note 4), V
IN
= 2.7V, V
OUT
= 4.5V
1.5x Mode (Note 4), V
IN
= 3.6V, V
OUT
= 4.5V
Oscillator Free Running, 2x Mode
Oscillator Free Running, 1.5x Mode
●
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
LTC3203/LTC3203-1/LTC3203B/LTC3203B-1
CONDITIONS
●
●
MIN
2.7
TYP
MAX
5.5
1
UNITS
V
µA
Ω
Ω
MHz
MHz
2.0
1.5
1.0
0.9
0.874
0.788
1.3
0.91
0.82
3.0
2.6
0.946
0.852
0.4
–1
–1
–1
–1
1
1
1
1
32031fa
2
U
V
V
V
V
µA
µA
µA
µA
W
U
U
W W
W
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
The
●
denotes specifications which apply over the full specified temperature
range, otherwise specifications are at 25°C. V
IN
= 3.6V, C1 = C2 = 2.2
µ
F unless otherwise specified.
SYMBOL
V
OUT
PARAMETER
4.5V Output Voltage Range
(V
SEL
= 0V) (Note 5)
5V Output Voltage Range
(V
SEL
= V
IN
) (Note 5)
∆V
OUT
/∆I
OUT
I
CC
V
OUT
Load Regulation
No Load Operating Current
(LTC3203-1)
No Load Operating Current
(LTC3203B-1)
V
VSELH
V
VSELL
I
VSELH
I
VSELL
LTC3203/LTC3203B
V
FB
I
FB
∆V
FB
/∆I
OUT
I
CC
Feedback Servo Voltage
FB Input Current
Load Regulation
(Refer to FB Pin)
No Load Operating Current
(LTC3203)
No Load Operating Current
(LTC3203B)
I
OUT
= 0mA, 2.7V
≤
V
IN
≤
5.5V
V
FB
= 0.95V
I
OUT
= 100mA to 500mA, 2x Mode, V
IN
= 3.6V
I
OUT
= 100mA to 500mA, 1.5x Mode, V
IN
= 4V
I
OUT
= 0mA, 2x Mode, 5V V
OUT
Setting
I
OUT
= 0mA, 1.5x Mode, 5V V
OUT
Setting
I
OUT
= 0mA, 2x Mode, 5V V
OUT
Setting
I
OUT
= 0mA, 1.5x Mode, 5V V
OUT
Setting
●
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
IN
> 3.1V, I
OUT
< 500mA
V
IN
> 2.9V, I
OUT
< 350mA
V
IN
> 2.7V, I
OUT
< 250mA
V
IN
> 3.1V, I
OUT
< 500mA
V
IN
> 3.1V, I
OUT
< 400mA
V
IN
> 2.7V, I
OUT
< 150mA
V
IN
= 3.6V, I
OUT
= 100mA to 500mA, 2x Mode,
V
IN
= 4V, I
OUT
= 100mA to 500mA, 1.5x Mode
I
OUT
= 0mA, 2x Mode
I
OUT
= 0mA, 1.5x Mode
I
OUT
= 0mA, 2x Mode
I
OUT
= 0mA, 1.5x Mode
●
●
●
●
MIN
4.32
4.32
4.32
4.8
4.8
4.8
TYP
4.5
4.5
4.5
5
5
5
0.37
0.27
120
100
9
7
MAX
4.68
4.68
4.68
5.2
5.2
5.2
UNITS
V
V
V
V
V
V
mV/mA
mV/mA
LTC3203-1/LTC3203B-1
●
●
●
●
300
300
µA
µA
mA
mA
V
V
SEL
Input High Voltage
V
SEL
Input Low Voltage
V
SEL
Input High Current
V
SEL
Input Low Current
1.3
0.4
–1
–1
0.88
–50
0.08
0.06
120
100
9
7
300
300
0.91
1
1
0.94
50
V
µA
µA
V
nA
mV/mA
mV/mA
µA
µA
mA
mA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Based on long-term current density limitations.
Note 3:
The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 are guaranteed
to meet performance specifications from 0°C to 85°C. Specifications over
the –40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 4:
Output not in regulation (based on wafer sort):
R
OL
≡
(2
•
V
IN
– V
OUT
)/I
OUT
, 2x Mode
R
OL
≡
(1.5
•
V
IN
– V
OUT
)/I
OUT
, 1.5x Mode
Note 5:
Proper conversion mode, 1.5x or 2x, has to be chosen based on
R
OL
to ensure output regulation.
32031fa
3
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
T
A
= 25
°
C, V
IN
= 3.6V, C1 = C2 = 2.2
µ
F unless otherwise specified
V
OUT
vs Load Current
(4.5V Output Setting)
4.65
4.60
4.55
V
IN
= 3.6V
V
OUT
(V)
V
OUT
(V)
4.50
4.45
4.40
4.35
4.30
4.25
0
1.5x MODE
2x MODE
50 100 150 200 250 300 350 400 450 500
I
LOAD
(mA)
3203 G01
TYPICAL PERFOR A CE CHARACTERISTICS
V
OUT
vs Load Current
(5V Output Setting)
5.5
5.3
5.1
4.9
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 2.7V
V
OUT
(V)
4.8
4.6
V
IN
= 3V
V
IN
= 2.7V
V
IN
= 3.3V
V
OUT
vs Supply Voltage
(5V Output Setting)
5.4
5.2
5.0
I
LOAD
= 500mA
I
LOAD
= 0mA
2.0
2.5
V
OUT
(V)
I
LOAD
= 250mA
4.6
4.4
R
OL
(Ω)
4.8
4.2
4.0
2.5
3
Oscillator Frequency
vs Supply Voltage
1.4
1.2
2x MODE
FREQUENCY (MHz)
1.0
1.5x MODE
0.8
0.6
0.4
0.2
0
2.5
I
SC
(mA)
3
4
U W
3.5
V
OUT
vs Supply Voltage
(4.5V Output Setting)
I
LOAD
= 0mA
V
IN
= 3V
4.4
4.2
I
LOAD
= 500mA
I
LOAD
= 250mA
4.7
4.5
4.3
4.1
3.9
3.7
3.5
0
4.0
3.8
3.6
3.4
1.5x MODE
2x MODE
50 100 150 200 250 300 350 400 450 500
I
LOAD
(mA)
3203 G02
3.2
3.0
2.5
3
3.5
4
V
IN
(V)
4.5
1.5x MODE
2x MODE
5
5.5
3203 G03
Open-Loop Output Resistance
vs Temperature
2x MODE
V
IN
= 2.7V
V
OUT
= 4.5V
1.5
1.5x MODE
V
IN
= 3.6V
V
OUT
= 4.5V
1.0
0.5
1.5x MODE
2x MODE
4
V
IN
(V)
4.5
5
5.5
3203 G04
0
–40
–15
35
10
TEMPERATURE (°C)
60
85
3203 G06
Short-Circuit Current
vs Supply Voltage
1400
1200
1000
1.5x MODE
800
600
2x MODE
400
200
0
2.5
3.5
4
V
IN
(V)
4.5
5
5.5
3203 G07
3
3.5
4
V
IN
(V)
4.5
5
5.5
3203 G08
32031fa
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
TYPICAL PERFOR A CE CHARACTERISTICS
No-Load Input Current vs Supply
Voltage (LTC3203/LTC3203-1)
160
140
120
100
2x MODE
1.5x MODE
I
LOAD
(mA)
I
IN
(µA)
300
250
200
150
1.5x MODE
80
60
40
20
0
2.5
3
3.5
4
V
IN
(V)
4.5
5
5.5
3203 G10
EXTRA I
IN
(mA)
Input and Output Ripple
(1.5x Mode)
V
IN
20mV/DIV
AC-COUPLED
V
IN
20mV/DIV
AC-COUPLED
V
OUT
20mV/DIV
AC-COUPLED
V
IN
= 4V
C
IN
= 2.2µF
C
OUT
= 10µF
I
OUT
= 300mA
1.5x MODE
500ns/DIV
Load Transient (2x Mode)
0.94
V
OUT
100mV/DIV
AC-COUPLED
V
FB
(V)
I
OUT
500mA
100mA
0.91
T
A
= 85°C
0.90
V
FB
(V)
V
IN
= 3.6V
C
IN
= 2.2µF
C
OUT
= 10µF
2x MODE
20µs/DIV
U W
Burst Mode Current Threshold
vs Supply Voltage
(LTC3203/LTC3203-1)
500
450
400
350
10
100
Extra Input Current vs Load
Current (LTC3203/LTC3203-1)
2x MODE
I
IN
– 2 • I
LOAD
1
1.5x MODE
I
IN
– 1.5 • I
LOAD
0.1
100
50
0
2.5
3
3.5
4
V
IN
(V)
4.5
5
5.5
3203 G11
2x MODE
0.01
0.01
0.1
1
10
I
LOAD
(mA)
100
1000
3209 G12
Input and Output Ripple
(2x Mode)
V
OUT
100mV/DIV
AC-COUPLED
Load Transient (1.5x Mode)
V
OUT
20mV/DIV
AC-COUPLED
I
OUT
500mA
100mA
3203 G13
V
IN
= 3.6V
C
IN
= 2.2µF
C
OUT
= 10µF
I
OUT
= 300mA
2x MODE
500ns/DIV
3203 G14
V
IN
= 4V
C
IN
= 2.2µF
C
OUT
= 10µF
1.5x MODE
20µs/DIV
3203 G15
V
FB
Set Point vs Supply Voltage
(LTC3203/LTC3203B)
0.96
0.94
0.92
T
A
= –40°C
T
A
= 25°C
0.90
0.88
V
FB
vs Load Current
(LTC3203/LTC3202B)
0.93
0.92
V
IN
= 4V
1.5x MODE
V
IN
= 3.6V
2x MODE
0.86
0.84
0.82
2.5
3
3.5
4
V
IN
(V)
4.5
5
5.5
3203 G17
3203 G16
0.89
0.88
0 50 100 150 200 250 300 350 400 450 500
I
LOAD
(mA)
3203 G18
32031fa
5
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