Linear Technology LTC1754-3.3, LTC1754-5 Datasheet
FEATURES
SUPPLY VOLTAGE (V)
2.5
4.85
OUTPUT VOLTAGE (V)
4.90
4.95
5.00
5.05
5.15
3.0
3.5 4.0 4.5
1574 TA03
5.0 5.5
5.10
TA = –40°C
T
A
= 85°C
I
OUT
= 25mA
C
OUT
= 10µF
C
FLY
= 1µF
TA = 25°C
■
Ultralow Power: IIN = 13µA
■
Regulated Output Voltage: 3.3V ±4%, 5V ±4%
■
5V Output Current: 50mA (VIN ≥ 3.0V)
■
3.3V Output Current: 40mA (VIN ≥ 2.5V)
■
No Inductors Needed
■
Very Low Shutdown Current: <1µA
■
Shutdown Disconnects Load from V
■
Internal Oscillator: 600kHz
■
Short-Circuit and Overtemperature Protected
■
Ultrasmall Application Circuit: (0.052 Inch2)
■
6-Pin SOT-23 Package
IN
U
APPLICATIO S
LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
U
DESCRIPTIO
The LTC®1754 is a micropower charge pump DC/DC
converter that produces a regulated output. The input
voltage range is 2V to 4.4V for 3.3V output and 2.7V to
5.5V for 5V output. Extremely low operating current and a
low external parts count (one flying capacitor and two
small bypass capacitors at VIN and V
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch2.
The LTC1754 operates as a Burst ModeTM switched capacitor voltage doubler to produce a regulated output. It has
thermal shutdown capability and can survive a continuous
short circuit from V
to GND.
OUT
) make the LTC1754
OUT
■
SIM Interface Supplies for GSM Cellular Telephones
■
White LED Power Supplies
■
Li-Ion Battery Backup Supplies
■
Handheld Computers
■
Smart Card Readers
■
PCMCIA Local 5V Supplies
TYPICAL APPLICATIO
V
OUT
Regulated 3.3V Output from 2V to 4.4V Input
Regulated 5V Output from 2.7V to 5.5V Input
10µF
ON/OFF
1
2
3
= 0mA TO 20mA, VIN > 2.0V
I
OUT
= 0mA TO 40mA, VIN > 2.5V
I
OUT
= 0mA TO 25mA, VIN > 2.7V
I
OUT
= 0mA TO 50mA, VIN > 3.0V
I
OUT
V
OUT
LTC1754-X
GND
SHDN
V
= 3.3V ±4%
OUT
V
= 5V ±4%
OUT
+
C
V
IN
–
C
The LTC1754 is available in a 6-pin SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
U
LTC1754-3.3
6
1µF
5
4
10µF
1754 TA01
V
IN
Output Voltage vs Supply Voltage
3.40
I
= 20mA
OUT
C
= 10µf
OUT
= 1µF
C
FLY
3.35
= 85°C
T
A
3.30
OUTPUT VOLTAGE (V)
3.25
3.20
2.0
T
= 25°C
A
TA = –40°C
2.5
3.0
SUPPLY VOLTAGE (V)
3.5
4.0
4.5
1754 TA02
Output Voltage vs Supply Voltage
LTC1754-5
1
LTC1754-3.3/LTC1754-5
WWWU
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
VIN to GND .................................................. – 0.3V to 6V
V
to GND ............................................... – 0.3V to 6V
OUT
SHDN to GND.............................................. – 0.3V to 6V
I
(Note 4) ......................................................... 75mA
OUT
V
Short-Circuit Duration ............................ Indefinite
OUT
Operating Temperature Range (Note 3) ... – 40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
V
OUT
GND 2
SHDN 3
TOP VIEW
1
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
= 150°C, θJA = 230°C/ W
JMAX
6 C
5 V
4 C
+
IN
–
Lead Temperature (Soldering, 10 sec)................... 300°C
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC1754-3.3
V
IN
V
OUT
I
CC
V
R
η Efficiency VIN = 2.0V, I
f
OSC
t
ON
I
SC
LTC1754-5
V
IN
V
OUT
I
CC
V
R
η Efficiency VIN = 3V, I
f
OSC
t
ON
I
SC
LTC1754-3.3/LTC1754-5
I
SHDN
V
IH
V
IL
I
IH
I
IL
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: 0.6µF is the minimum required C
current capability. Depending on the choice of capacitor material, a
somewhat higher value of capacitor may be required to attain 0.6µF over
temperature.
Input Supply Voltage ● 2.0 4.4 V
Output Voltage 2.0V ≤ VIN ≤ 4.4V, I
Operating Supply Current 2.0V ≤ VIN ≤ 4.4V, I
Output Ripple VIN = 2.5V, I
Switching Frequency Oscillator Free Running 600 kHz
V
Turn-On Time VIN = 2.0V, I
OUT
Output Short-Circuit Current VIN = 2.5V, V
Input Supply Voltage ● 2.7 5.5 V
Output Voltage 2.7V ≤ VIN ≤ 5.5V, I
Operating Supply Current 2.7V ≤ VIN ≤ 5.5V, I
Output Ripple VIN = 3V, I
Switching Frequency Oscillator Free Running 700 kHz
V
Turn-On Time VIN = 3V, I
OUT
Output Short-Circuit Current VIN = 3V, V
Shutdown Supply Current VIN ≤ 3.6V, I
SHDN Input Threshold (High) ● 1.4 V
SHDN Input Threshold (Low) ● 0.3 V
SHDN Input Current (High) SHDN = V
SHDN Input Current (Low) SHDN = 0V ● –1 1 µA
capacitance for rated output
FLY
2.5V ≤ V
3.0V ≤ VIN ≤ 5.5V, I
3.6V < V
The ● denotes specifications which apply over the full operating
= 1µF (Note 2), CIN = 10µF, C
FLY
≤ 20mA ● 3.17 3.30 3.43 V
≤ 4.4V, I
IN
OUT
OUT
OUT
, I
IN
IN
OUT
≤ 40mA ● 3.17 3.30 3.43 V
OUT
= 0mA, SHDN = V
OUT
= 40mA 23 mV
OUT
= 20mA 82 %
OUT
= 0mA 0.8 ms
OUT
= 0V, SHDN = 2.5V 118 mA
OUT
≤ 25mA ● 4.8 5.0 5.2 V
OUT
≤ 50mA ● 4.8 5.0 5.2 V
OUT
= 0mA, SHDN = V
OUT
= 50mA 65 mV
= 50mA 82.7 %
= 0mA 0.4 ms
= 0V, SHDN = 3V 150 mA
OUT
= 0mA, V
OUT
= 0mA, V
OUT
Note 3: The LTC1754ES6-X is 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 4: Based on long term current density limitations.
= 0V ● 0.01 1 µA
SHDN
= 0V ● 2.5 µA
SHDN
IN
IN
= 10µF.
OUT
● 11 30 µA
● 13 30 µA
● –1 1 µA
ORDER PART
NUMBER
LTC1754ES6-3.3
LTC1754ES6-5
S6 PART MARKING
LTGK
LTLW
P-P
P-P
2
UW
TYPICAL PERFOR A CE CHARACTERISTICS
No Load Supply Current
vs Supply VoltageOutput Voltage vs Output Current Supply Current vs V
3.40
TA = 25°C
= 10µF
C
OUT
= 1µF
C
FLY
3.35
3.30
OUTPUT VOLTAGE (V)
3.25
VIN = 2.5V
VIN = 2V
20
I
= 0µA
OUT
= 1µF
C
FLY
= V
V
SHDN
IN
15
10
SUPPLY CURRENT (µA)
TA = 85°C
TA = 25°C
TA = –40°C
LTC1754-3.3/LTC1754-5
LTC1754-3.3, TA = 25°C unless otherwise noted.
SHDN
20
TA = 25°C
= 0µA
I
OUT
15
VIN = 2.5V
10
V
= 2V
IN
SUPPLY CURRENT (µA)
5
V
= 4.5V
IN
3.20
0
I
OUT
0mA to 20mA
10mA/DIV
V
OUT
AC COUPLED
20mV/DIV
20
OUTPUT CURRENT (mA)
60
40
V
OUT
80
Short-Circuit Current
vs Supply Voltage
180
TA = 25°C
= 1µF
C
FLY
160
140
120
100
SHORT-CIRCUIT CURRENT (mA)
80
OUT
V
60
2.0
2.5 3.0 3.5 4.0
SUPPLY VOLTAGE (V)
Load Transient Response
1754 G01
100
5
2.0
1735 G04
V
OUT
AC COUPLED
20mV/DIV
2.5 3.0 3.5 4.0
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
4.5
Output Ripple
4.5
1754 G02
0
Efficiency vs Load Current
100
TA = 25°C
90
V
= 2V
IN
= 1µF
C
FLY
80
70
60
50
40
30
20
10
0
0.01 0.1 1 10 100
0.001
LOAD CURRENT (mA)
SHDN
1V/DIV
V
OUT
1V/DIV
1
2
V
CONTROL VOLTAGE (V)
SHDN
1754 G05
Start-Up Time
3
4
5
1754 G03
= 2V 50µs/DIV 1754 G07
V
IN
C
= 10µF
OUT
= 2V 5µs/DIV 1754 G08
V
IN
C
= 10µF
OUT
= 20mA
I
OUT
= 2V 200µs/DIV 1754 G9
V
IN
C
= 10µF
OUT
3
LTC1754-3.3/LTC1754-5
UW
TYPICAL PERFOR A CE CHARACTERISTICS
No Load Supply Current
vs Supply VoltageOutput Voltage vs Output Current Supply Current vs V
5.15
TA = 25°C
= 10µF
C
OUT
5.10
5.05
5.00
4.95
OUTPUT VOLTAGE (V)
4.90
= 1µF
C
FLY
VIN = 3V
VIN = 2.7V
20
I
= 0µA
OUT
C
= 1µF
FLY
V
= V
SHDN
IN
15
10
SUPPLY CURRENT (µA)
TA = 85°C
TA = 25°C
TA = –40°C
LTC1754-5, TA = 25°C unless otherwise noted.
SHDN
25
TA = 25°C
I
= 0µA
OUT
20
VIN = 3.3V
15
VIN = 2.7V
10
SUPPLY CURRENT (µA)
5
V
= 5.5V
IN
4.85
0
I
OUT
0mA to 50mA
25mA/DIV
V
OUT
AC COUPLED
50mV/DIV
20 40 60 80
OUTPUT CURRENT (mA)
V
Short-Circuit Current
OUT
vs Supply Voltage
220
TA = 25°C
C
= 1µF
FLY
200
180
160
140
SHORT-CIRCUIT CURRENT (mA)
120
OUT
V
100
2.5
3.0
SUPPLY VOLTAGE (V)
3.5
1574-5 G02
100
4.0 4.5
5
2.5
5.0 5.5
1754 G13
V
OUT
AC COUPLED
20mV/DIV
3.5
3.0
SUPPLY VOLTAGE (V)
4.0 4.5
5.0 5.5
1754 G11
0
2
1
V
CONTROL VOLTAGE (V)
SHDN
Efficiency vs Load Current
100
VIN = 3V
90
T
= 25°C
A
C
= 1µF
FLY
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
0.01 0.1 1 10 100
0.001
LOAD CURRENT (mA)
1754-5 G05
Output RippleLoad Transient Response Start-Up Time
SHDN
5V/DIV
V
OUT
1V/DIV
4
5
3
6
1574 G12
4
V
= 3V 50µs/DIV 1754 G16
IN
C
= 10µF
OUT
= 3V 5µs/DIV 1754 G17
V
IN
C
= 10µF
OUT
= 50mA
I
OUT
V
= 3V 100µs/DIV 1754 G18
IN
C
= 10µF
OUT
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