LTC3221/
LTC3221-3.3/LTC3221-5
Micropower,
Regulated Charge Pump
in 2
×
2 DFN
FEATURES
■
■
■
DESCRIPTIO
■
■
■
■
■
■
■
■
Ultralow Power: 8µA Quiescent Current
Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
V
IN
Range:
1.8V to 4.4V (LTC3221-3.3)
2.7V to 5.5V (LTC3221-5)
Output Current: Up to 60mA
No Inductors Needed
Very Low Shutdown Current: <1µA
Shutdown Disconnects Load from V
IN
Burst Mode Control
Short-Circuit Protected
Solution Profile < 1mm
Tiny 2mm
×
2mm 6-Pin DFN Package
The LTC
®
3221 family are micropower charge pump DC/DC
converters that produce a regulated output at up to 60mA.
The input voltage range is 1.8V to 5.5V. Extremely low
operating current (8µA typical at no load) and low external
parts count (one flying capacitor and two small bypass
capacitors at V
IN
and V
OUT
) make them ideally suited for
small, battery-powered applications.
The LTC3221 family includes fixed 5V and 3.3V output
versions plus an adjustable version. All parts operate
as Burst Mode
®
switched capacitor voltage doublers
to achieve ultralow quiescent current. The chips use a
controlled current to supply the output and will survive
a continuous short-circuit from V
OUT
to GND. The FB pin
of the adjustable LTC3221 can be used to program the
desired output voltage.
The LTC3221 family is available in a low profile (0.75mm)
2mm
×
2mm 6-pin 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.
APPLICATIO S
■
■
■
■
■
■
Low Power 2 AA Cell to 3.3V Supply
Memory Backup Supplies
Tire Pressure Sensors
General Purpose Low Power Li-Ion to 5V Supply
RF Transmitters
Glucose Meters
TYPICAL APPLICATIO
1µF
2
C
–
5
V
IN
4,7
3
GND
SHDN
1
C
+
V
OUT
No-Load Input Current
vs Supply Voltage
16
NO-LOAD INPUT CURRENT (µA)
14
12
10
8
6
4
2
0
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
V
IN
2.2µF
6
V
OUT
4.7µF
LTC3221-X
OFF ON
3221 TA01
REGULATED 3.3V OUTPUT FROM 1.8V TO 4.4V INPUT
V
OUT
= 3.3V
±4%
I
OUT
= OmA TO 25mA; V
IN
>1.8V
I
OUT
= OmA TO 60mA; V
IN
>2V
REGULATED 5V OUTPUT FROM 2.7V TO 5.5V INPUT
V
OUT
= 5V
±4%
I
OUT
= OmA TO 25mA; V
IN
>2.7V
I
OUT
= OmA TO 60mA; V
IN
>3V
U
3221 TA01b
U
U
3221f
1
LTC3221/
LTC3221-3.3/LTC3221-5
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C
+
1
C
–
2
SHDN/FB* 3
7
6 V
OUT
5 V
IN
4 GND
⎯
V
IN
, S
⎯
H
⎯
D
⎯
N, FB ............................................. – 0.3V to 6V
V
OUT
to GND............................................. – 0.3V to 5.5V
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
T
JMAX
= 125°C,
θ
JA
= 80°C/W
EXPOSED PAD IS GND (PIN 7) MUST BE SOLDERED TO PCB
*
⎯
S
⎯
H
⎯
D
⎯
N ON LTC3221-3.3;LTC3221-5 FB ON LTC3221
ORDER PART NUMBER
LTC3221EDC
LTC3221EDC-3.3
LTC3221EDC-5
DC PART MARKING
LCCP
LBQP
LCCN
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.
ELECTRICAL CHARACTERISTICS
SYMBOL
LTC3221-3.3
V
IN
V
OUT
I
CC
V
R
η
I
SC
LTC3221-5
V
IN
V
OUT
I
CC
V
R
η
I
SC
LTC3221
V
IN
V
FB
R
OL
I
CC
I
FB
Input Supply Voltage
Feedback Voltage
Open-Loop Impedance
Operating Supply Current
FB Input Current
Input Supply Voltage
Output Voltage
Operating Supply Current
Output Ripple
Efficiency
Output Short-Circuit Current
PARAMETER
Input Supply Voltage
Output Voltage
Operating Supply Current
Output Ripple
Efficiency
Output Short-Circuit Current
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.5V (LTC3221-3.3/LTC3221) or 3V (LTC3221-5),
⎯
S
⎯
H
⎯
D
⎯
N = V
IN
,
C
FLY
= 1µF, C
IN
= 2.2µF, C
OUT
= 2.2µF, unless otherwise specified.
CONDITIONS
●
MIN
1.8
3.168
TYP
MAX
4.4
UNITS
V
V
µA
mV
P-P
%
1.8V ≤ V
IN
≤ 4.4V, I
OUT
≤ 25mA
2V ≤ V
IN
< 4.4V, I
OUT
≤ 60mA
I
OUT
= 0mA
V
IN
= 2V, I
OUT
= 60mA, C
OUT
= 4.7µF (Note 3)
V
IN
= 2V, I
OUT
= 60mA (Note 3)
V
OUT
= 0V
●
●
3.3
8
35
82
3.432
15
●
120
2.7
4.8
5
8
45
82
240
5.5
5.2
15
●
2.7V ≤ V
IN
≤ 5.5V, I
OUT
< 25mA
3V ≤ V
IN
≤ 5.5V, I
OUT
< 60mA
I
OUT
= 0mA
V
IN
= 3V, I
OUT
= 60mA, C
OUT
= 4.7µF (Note 3)
V
IN
= 3V, I
OUT
= 60mA (Note 3)
V
OUT
= 0V
●
●
mV
P-P
%
240
5.5
mA
V
V
Ω
µA
nA
3221f
●
120
1.8
1.181
1.23
10
5
–100
●
●
1.279
20
12
100
V
IN
= 1.8V, V
OUT
= 3V (Note 4)
I
OUT
= 0mA
FB = 1.33V, V
IN
= 2V
●
●
●
2
U
mA
V
V
µA
W
U
U
W W
W
LTC3221/
LTC3221-3.3/LTC3221-5
The
the specifications which
ELECTRICAL CHARACTERISTICS
25°C. V
●
denotes(LTC3221-3.3/LTC3221) orapply over the full
⎯
Soperating ,
temperature range, otherwise specifications are at T =
= 2.5V
3V (LTC3221-5),
⎯
H
⎯
D
⎯
N = V
A
IN
IN
C
FLY
= 1µF, C
IN
= 2.2µF, C
OUT
= 2.2µF, unless otherwise specified.
SYMBOL
PARAMETER
LTC3221-3.3/LTC3221-5
Shutdown Supply Current
I
⎯
S
⎯
H
⎯
D
⎯
N
⎯
S
⎯
H
⎯
D
⎯
N Input Threshold (High)
V
IH
⎯
S
⎯
H
⎯
D
⎯
N Input Threshold (Low)
V
IL
⎯
S
⎯
H
⎯
D
⎯
N Input Current (High)
I
IH
⎯
S
⎯
H
⎯
D
⎯
N Input Current (Low)
I
IL
LTC3221/LTC3221-3.3/LTC3221-5
Switching Frequency
f
OSC
UVLO Threshold
V
UVLO
CONDITIONS
V
OUT
= 0V,
⎯
S
⎯
H
⎯
D
⎯
N = 0V
●
●
●
MIN
TYP
MAX
1
UNITS
µA
V
V
µA
µA
kHz
V
1.3
–1
–1
600
1
0.4
1
1
⎯
S
⎯
H
⎯
D
⎯
N = V
IN
⎯
S
⎯
H
⎯
D
⎯
N = 0V
V
OUT
= 2.5V
●
●
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LTC3221EDC-X is guaranteed to meet performance
specifications from 0°C to 70°C. Specificaiton over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statisitical process controls.
Note 3:
Guaranteed by design, not subject to test.
Note 4:
R
OL
= (2V
IN
– V
OUT
)/I
OUT
.
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency vs
Supply Voltage
800
750
700
FREQUENCY (kHz)
FREQUENCY (kHz)
650
600
550
500
450
400
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
800
750
700
650
600
V
IN
= 2.5V
550
500
450
400
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0.4
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
V
IN
= 1.8V
V
IN
= 4.5V
THRESHOLD VOLTAGE (V)
0.8
LOW-TO-HIGH THRESHOLD
⎯
S
⎯
H
⎯
D
⎯
N LO-to-HI Threshold vs
Temperature
0.9
SHDN HI-TO-LO THRESHOLD (V)
SHDN LO-TO-HI THRESHOLD (V)
0.9
SHORT-CIRCUIT CURRENT (mA)
0.8
V
IN
= 3.2V
V
IN
= 2.5V
0.6
V
IN
= 1.8V
0.5
0.7
0.4
–50
–25
0
25
50
75
TEMPERATURE (°C)
U W
100
Oscillator Frequency vs
Temperature
0.9
⎯
S
⎯
H
⎯
D
⎯
N Threshold Voltage vs
Supply Voltage
0.7
HIGH-TO-LOW THRESHOLD
0.6
0.5
3221 G01
3221 G02
3221 G03
⎯
S
⎯
H
⎯
D
⎯
N HI-to-LO Threshold vs
Temperature
150
V
IN
= 3.2V
Short-Circuit Current vs
Supply Voltage
T
A
= –45°C
130
0.8
0.7
V
IN
= 2.5V
110
T
A
= 25°C
90
T
A
= 90°C
0.6
V
IN
= 1.8V
0.5
70
125
0.4
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
50
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
3221 G04
3221 G05
3221 G06
3221f
3
LTC3221/
LTC3221-3.3/LTC3221-5
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
3.36
3.34
3.32
OUTPUT VOLTAGE (V)
3.30
3.28
3.26
3.24
3.22
3.20
3.18
3.16
0
20
40
60
80
LOAD CURRENT (mA)
100
120
3221 G07
120
110
V
IN
= 3.2V
LOAD CURRENT (mA)
100
90
80
70
60
50
EFFECTIVE OPEN-LOOP OUTPUT RESISTANCE (Ω)
V
IN
= 2.5V
V
IN
= 1.8V
No-Load Input Current vs
Supply Voltage
16
14
NO-LOAD INPUT CURRENT (µA)
EXCESS INPUT CURRENT (mA)
12
10
8
6
4
2
0
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
4.0
4.5
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
1
10
EFFICIENCY (%)
Output Ripple vs Load Current
70
60
OUTPUT RIPPLE (mV
P-P
)
C
OUT
= 2.2µF
50
40
30
20
10
0
0
20
40
60
80
LOAD CURRENT (mA)
100
3221 G13
C
OUT
= 4.7µF
4
U W
3221 G10
(LTC3221-3.3 only)
Output Load Capability at 4%
Below Regulation
V
OUT
= 3.168V
T
A
= –45°C
15
Effective Open-Loop Output
Resistance vs Temperature
V
IN
= 1.8V
14
V
OUT
= 3V
13
12
11
10
9
8
7
6
5
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
3221 G09
T
A
= 90°C
T
A
= 25°C
40
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
3.5
3221 G08
Extra Input Current vs Load
Current (I
IN
-2 I
LOAD
)
V
IN
= 2.5V
100
90
80
70
60
50
40
30
0.01
20
10
0.001
0.01
0
0.1
1
10
LOAD CURRENT (mA)
100
3221 G11
Efficiency vs Supply Voltage
THEORETICAL MAX
I
OUT
= 30mA
I
OUT
= 1mA
0.1
1.8
2.0
2.2 2.4 2.6
2.8
SUPPLY VOLTAGE (V)
3.0
3.2
3221 G12
Output Ripple
V
OUT
20mV/DIV
(AC-COUPLED)
Load Transient Response
V
OUT
20mV/DIV
(AC-COUPLED)
60mA
I
OUT
0mA
1µs/DIV
V
IN
= 2V
I
LOAD
= 60mA
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G14
5µs/DIV
V
IN
= 2V
I
LOAD
= 0mA TO 60mA STEP
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G15
3221f
LTC3221/
LTC3221-3.3/LTC3221-5
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
5.10
5.05
OUTPUT VOLTAGE (V)
5.00
V
IN
= 3.6V
4.95
V
IN
= 2.7V
4.90
4.85
4.80
V
IN
= 4.2V
LOAD CURRENT (mA)
100
90
80
70
60
50
40
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
3221 G17
3221 G16
120
110
EFFECTIVE OPEN-LOOP OUTPUT RESISTANCE (Ω)
0
20
40
60
80
LOAD CURRENT (mA)
No-Load Input Current vs
Supply Voltage
16
14
NO-LOAD INPUT CURRENT (µA)
EXCESS INPUT CURRENT (mA)
12
10
8
6
4
2
0
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
T
A
= 25°C
T
A
= –45°C
T
A
= 90°C
1
10
EFFICIENCY (%)
Output Ripple vs Load Current
90
80
OUTPUT RIPPLE (mV
P-P
)
70
60
50
40
C
OUT
= 4.7µF
30
20
10
0
0
20
60
80
40
LOAD CURRENT (mA)
100
3221 G13
V
IN
= 3V
C
OUT
= 2.2µF
V
OUT
50mV/DIV
(AC-COUPLED)
U W
100
(LTC3221-5 only)
Output Load Capability at 4%
Below Regulation
V
OUT
= 4.8V
15
T
A
= –45°C
Effective Open-Loop Output
Resistance vs Temperature
V
IN
= 2.7V
14
V
OUT
= 4.5V
13
12
11
10
9
8
7
6
5
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
3221 G18
T
A
= 90°C
T
A
= 25°C
120
Extra Input Current vs Load
Current (I
IN
-2 I
LOAD
)
V
IN
= 3V
100
90
80
70
60
50
40
30
0.01
20
10
0.001
0.01
0
0.1
1
10
LOAD CURRENT (mA)
100
3221 G20
Efficiency vs Supply Voltage
THEORETICAL MAX
I
OUT
= 1mA
I
OUT
= 30mA
0.1
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
4.2
4.5
3221 G19
3221 G21
Output Ripple
V
OUT
50mV/DIV
(AC-COUPLED)
Load Transient Response
60mA
I
OUT
0mA
1µs/DIV
V
IN
= 3V
I
LOAD
= 60mA
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G23
5µs/DIV
V
IN
= 3V
I
LOAD
= 0mA TO 60mA STEP
C
OUT
= 4.7µF, 6.3V, SIZE 0603
3221 G24
3221f
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
