LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
Low Noise Regulated
Charge Pump in 2
×
2 DFN
U
LTC3204B-5
50
75
100
125
OUTPUT CURRENT (mA)
150
3204 TA01b
FEATURES
■
■
DESCRIPTIO
■
■
■
■
■
■
■
■
■
Fixed 3.3V or 5V Outputs
V
IN
Range:
1.8V to 4.5V (LTC3204-3.3/LTC3204B-3.3)
2.7V to 5.5V (LTC3204-5/LTC3204B-5)
Output Current:
Up to 150mA (LTC3204-5/LTC3204B-5)
Up to 50mA (LTC3204-3.3/LTC3204B-3.3)
Automatic Burst Mode
®
Operation with I
Q
= 48µA
(LTC3204-3.3/LTC3204-5)
Constant Frequency Operation at All Loads
(LTC3204B-3.3/LTC3204B-5)
Low Noise Constant Frequency (1.2MHz) Operation*
Built-In Soft-Start Reduces Inrush Current
Shutdown Disconnects Load from Input
Shutdown Current <1µA
Short-Circuit/Thermal Protection
Available in Low Profile 6-Lead DFN Package
2 AA Cell to 3.3V
Li-Ion to 5V
USB On-The-Go Devices
White LED Drivers
Handheld Devices
The LTC
®
3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5
are low noise, constant frequency (1.2MHz) switched ca-
pacitor voltage doublers. The LTC3204-3.3/LTC3204B-3.3
can produce a regulated output voltage of 3.3V
from a minimum input voltage of 1.8V (2 alkaline cells)
whereas the LTC3204-5/LTC3204B-5 can produce 5V from
a minimum of 2.7V (Li-Ion battery) input.
LTC3204-3.3/LTC3204-5 feature automatic Burst Mode
®
operation at light loads to maintain low supply current
whereas LTC3204B-3.3/LTC3204B-5 feature constant
frequency operation at any load. Built-in soft-start circuitry
prevents excessive inrush current during start-up. Thermal
shutdown and current-limit circuitry allow the parts to
survive a continuous short-circuit from V
OUT
to GND.
High switching frequency minimizes overall solution
footprint by allowing the use of tiny ceramic capaci-
tors. In shutdown, the load is disconnected from the
input and the quiescent current is reduced to <1µA. The
LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are
available in a low profile (0.75mm) 6-lead 2mm × 2mm
DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6411531.
APPLICATIO S
■
■
■
■
■
2.2µF
25
2.7V TO 5.5V
2.2µF
1, 7
6
2
OUTPUT RIPPLE (mVp-p)
V
IN
5
C
–
4
C
+
3
V
OUT
20
15
10
5
0
LTC3204-5/
LTC3204B-5
GND
SHDN
OFF ON
U
TYPICAL APPLICATIO
U
Output Ripple vs Load Current
30
OUTPUT CAPACITANCE = 2.2µF
V
IN
= 3.6V
5V
2.2µF
LTC3204-5
3204 TA01a
0
25
3204fa
1
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
(Note 1)
V
IN
to GND ................................................... –0.3V to 6V
V
OUT
to GND ............................................. –0.3V to 5.5V
S
H
D
N to GND............................................... –0.3V to 6V
V
OUT
Short-Circuit Duration ............................. Indefinite
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range.................. –65°C to 125°C
Maximum Junction Temperature .......................... 125°C
TOP VIEW
GND 1
V
IN
2
V
OUT
3
7
6 SHDN
5 C
–
4 C
+
DC PACKAGE
6-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 80°C/W
EXPOSED PAD IS GND (PIN 7)
MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LTC3204EDC-3.3
LTC3204EDC-5
LTC3204BEDC-3.3
LTC3204BEDC-5
DC PART
MARKING
LBJV
LBNK
LBVF
LBVG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT
PARAMETER
Input Voltage Range
Output Voltage Range
CONDITIONS
The
●
denotes the specifications which apply over the full operating
temperature range. Specifications are at T
A
= 25°C, V
IN
= 2.4V (LTC3204-3.3/LTC3204B-3.3) or 3.6V (LTC3204-5/LTC3204B-5),
S
H
D
N = V
IN
, C
FLY
= 2.2µF, C
IN
= 2.2µF, C
OUT
= 2.2µF unless otherwise noted.
MIN
●
●
●
●
TYP
MAX
4.5
5.5
UNITS
V
V
V
V
µA
µA
mA
mA
µA
mA
mA
mV
P-P
%
MHz
V
V
µA
µA
Ω
Ω
mA
ms
I
IN
No Load Input Current
I
S
H
D
N
I
BURST
V
R
η
f
OSC
V
IH
V
IL
I
IH
I
IL
R
OL
I
LIM
T
SS
Shutdown Current
Burst Mode Threshold
Output Ripple
Efficiency
Switching Frequency
S
H
D
N Input Threshold
S
H
D
N Input Threshold
S
H
D
N Input Current
S
H
D
N Input Current
Effective Open-Loop Output
Resistance (Note 3)
Output Current Limit
Soft-Start Time
(LTC3204-3.3/LTC3204B-3.3)
(LTC3204-5/LTC3204B-5)
1.8V < V
IN
< 4.5V, I
OUT
< 40mA
1.9V < V
IN
< 4.5V, I
OUT
< 50mA (LTC3204-3.3/LTC3204B-3.3)
2.7V < V
IN
< 5.5V, I
OUT
< 65mA
3.1V < V
IN
< 5.5V, I
OUT
< 150mA (LTC3204-5/LTC3204B-5)
I
OUT
= 0 (LTC3204-3.3)
I
OUT
= 0 (LTC3204-5)
I
OUT
= 0 (LTC3204B-3.3)
I
OUT
= 0 (LTC3204B-5)
S
H
D
N = 0V, V
OUT
= 0V
(LTC3204-3.3)
(LTC3204-5)
I
OUT
= 100mA
V
IN
= 3V, I
OUT
= 100mA (LTC3204-5/LTC3204B-5)
1.8
2.7
3.168
4.8
3.3
5
48
60
1.25
3.6
15
20
20
82
1.2
3.432
5.2
1
●
●
●
●
0.6
1.3
–1
–1
1.8
0.4
1
1
S
H
D
N = 0V
V
IN
= 1.8V, V
OUT
= 3V (LTC3204-3.3/LTC3204B-3.3)
V
IN
= 2.7V, V
OUT
= 4.5V (LTC3204-5/LTC3204B-5)
V
OUT
= OV
From the Rising Edge of
S
H
D
N to 90% of V
OUT
●
7
6
300
0.75
Note 1:
Absolute Maximum Ratings are those beyond which the life of a
device may be impaired.
Note 2:
The LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are
guaranteed to meet performance specifications from 0°C to 70°C.
Specifications over the –40°C to 85°C operating temperature range are
assured by design, characterization and correlation with statistical process
controls.
Note 3:
R
OL
≡
(2V
IN
– V
OUT
)/I
OUT
3204fa
2
U
W
U
U
W W
W
ABSOLUTE
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
TYPICAL PERFOR A CE CHARACTERISTICS
(T
A
= 25°C, C
FLY
= C
IN
= C
OUT
= 2.2µF unless otherwise specified)
Oscillator Frequency vs
Supply Voltage
1.50
1.25
FREQUENCY (MHz)
1.00
0.75
0.50
0.25
0
FREQUENCY (MHz)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
–50
0.5
1.5
V
IN
= 2.4V
V
IN
= 1.8V
V
IN
= 4.5V
THRESHOLD VOLTAGE (V)
0.8
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
S
H
D
N LO-to-HI Threshold vs
Temperature
0.9
SHDN THRESHOLD LO-TO-HI (V)
SHDN THRESHOLD HI-TO-LO (V)
0.8
0.8
V
IN
= 3.2V
0.7
V
IN
= 2.4V
0.7
SHORT-CIRCUIT CURRENT (mA)
0.6
V
IN
= 1.8V
0.5
–50
0
50
TEMPERATURE (°C)
100
U W
4.0
3204 G01
3204 G04
Oscillator Frequency vs
Temperature
0.9
S
H
D
N Threshold Voltage vs
Supply Voltage
LOW-TO-HIGH THRESHOLD
0.7
HIGH-TO-LOW THRESHOLD
0.6
4.5
–20
10
40
70
TEMPERATURE (°C)
100
130
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
3204 G02
3204 G03
S
H
D
N HI-to-LO Threshold vs
Temperature
350
V
IN
= 3.2V
V
IN
= 2.4V
0.6
300
250
200
150
100
50
Short-Circuit Current vs Supply
DEVICE CYCLES
IN AND OUT OF
THERMAL SHUTDOWN
0.5
V
IN
= 1.8V
150
0.4
–50
0
50
TEMPERATURE (°C)
100
150
3204 G05
0
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
3204 G06
3204fa
3
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
TYPICAL PERFOR A CE CHARACTERISTICS
(T
A
= 25°C, C
FLY
= C
IN
= C
OUT
= 2.2µF unless otherwise specified)
Load Regulation
3.35
3.30
OUTPUT VOLTAGE (V)
3.25
V
IN
= 3.2V
3.20
3.15
3.10
3.05
V
IN
= 1.8V
LOAD CURRENT (mA)
400
350
300
250
200
150
100
50
500
3204 G07
V
IN
= 2.4V
0
100
200
300
400
LOAD CURRENT (mA)
No-Load Input Current vs
Supply Voltage
64
62
NO-LOAD INPUT CURRENT (µA)
60
58
56
54
52
50
48
46
44
1.8
2
2.2 2.4 2.6
2.8
SUPPLY VOLTAGE (V)
3
3.2
3204 G10
EXCESS INPUT CURRENT (mA)
LTC3204B-3.3
EFFICIENCY (%)
LTC3204-3.3
V
OUT
Soft-Start Response
V
OUT
2V/DIV
S
H
D
N
2V/DIV
V
IN
= 2.4V
I
LOAD
= 50mA
500µs/DIV
3204
3204 G13
G13
4
U W
(LTC3204-3.3/LTC3204B-3.3 ONLY)
Output Load Capability at 4%
Below Regulation
V
OUT
= 3.168V
T
A
= 25°C
T
A
= 90°C
T
A
= –45°C
8
9
Effective Open-Loop Output
Resistance vs Temperature
V
IN
= 1.8V
V
OUT
= 3V
7
6
0
1.5
2.5
3.0
2.0
SUPPLY VOLTAGE (V)
3.5
3204 G08
5
–50
50
0
TEMPERATURE (°C)
100
3204 G09
Extra Input Current vs Load Current
(I
IN
-2I
LOAD
)
2.0
1.8
NO-LOAD INPUT CURRENT (mA)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.01
0.01
0.1
1
10
100
LOAD CURRENT (mA)
1000
3204 G11
Efficiency vs Supply Voltage
100
90
80
70
60
50
40
30
20
10
0
1.8
2.0
2.2 2.4 2.6
2.8
SUPPLY VOLTAGE (V)
3.0
3.2
I
OUT
= 30mA
THEORETICAL MAX
10
V
IN
= 2.4V
LTC3204B-3.3
(NON-BURST MODE
OPERATION)
1
LTC3204-3.3
(BURST MODE
OPERATION)
I
OUT
= 1mA
0.1
3204 G12
Output Ripple
Load Transient Response
V
OUT
20mV/DIV
(AC COUPLED)
V
OUT
20mV/DIV
(AC COUPLED)
I
OUT
V
IN
= 2.4V
I
LOAD
= 50mA
500ns/DIV
3204
3204 G14
G14
50mA
30mA
10µs/DIV
V
IN
= 2.4V
I
OUT
= 30mA TO 50mA STEP
3204
3204 G15
G15
3204fa
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
TYPICAL PERFOR A CE CHARACTERISTICS
(T
A
= 25°C, C
FLY
= C
IN
= C
OUT
= 2.2µF unless otherwise specified)
Load Regulation
5.20
5.10
OUTPUT VOLTAGE (V)
OUTPUT LOAD (mA)
5.00
4.90
4.80
4.70
4.60
4.50
0
100
400
300
LOAD CURRENT (mA)
200
500
3204 G16
V
IN
= 3.6V
V
IN
= 2.7V
No-Load Input Current vs
Supply Voltage
70
68
NO-LOAD INPUT CURRENT (µA)
LTC3204-5
EXCESS INPUT CURRENT (mA)
66
64
62
60
58
56
54
52
50
2.7
3
3.6
3.9
3.3
SUPPLY VOLTAGE (V)
4.2
LTC3204B-5
EFFICIENCY (%)
V
OUT
Soft-Start
V
OUT
2V/DIV
SH
D
N
5V/DIV
V
IN
= 3.6V
I
OUT
= 100mA
500µs/DIV
3204 G22
U W
V
IN
= 4.2V
3204 G19
(LTC3204-5/LTC3204B-5 ONLY)
Output Load Capability at 4%
Below Regulation
500
450
400
350
300
250
200
150
100
50
0
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
3204 G17
Effective Open-Loop Output
Resistance vs Temperature
8
V
IN
= 2.7V
V
OUT
= 4.5V
V
OUT
= 4.8V
T
A
= 90°C
T
A
= 25°C
7
T
A
= –45°C
6
5
4
–50
0
50
100
3204 G18
TEMPERATURE (°C)
Extra Input Current vs Load Current
(I
IN
-2I
LOAD
)
4.0
3.6
NO-LOAD INPUT CURRENT (mA)
Efficiency vs Supply Voltage
100
90
80
70
60
50
40
30
20
10
I
OUT
= 100mA
I
OUT
= 10mA
I
OUT
= 1mA
THEORETICAL MAX
10
V
IN
= 3.6V
LTC3204B-5
(N0N-BURST MODE
OPERATION)
LTC3204-5
(BURST-MODE
OPERATION)
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
4.5
1
0.1
0.01
0.01
0.1
1
10
100
LOAD CURRENT (mA)
1000
3204 G20
0
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
3204 G21
Output Ripple
Load Transient Response
V
OUT
20mV/DIV
(AC COUPLED)
V
OUT
50mV/DIV
(AC COUPLED)
100mA
60mA
V
IN
= 3.6V
I
OUT
= 100mA
500ns/DIV
3204 G23
I
OUT
10µs/DIV
V
IN
= 3.6V
I
OUT
= 60mA TO 100mA STEP
3204 G24
3204fa
5
