LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
FEATURES
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DESCRIPTIO
Ultralow Power: I
IN
= 13
µ
A
Regulated Output Voltage: 3.3V
±
4%, 5V
±
4%
5V Output Current: 50mA (V
IN
≥
3.0V)
3.3V Output Current: 40mA (V
IN
≥
2.5V)
No Inductors Needed
Very Low Shutdown Current: <1µA
Shutdown Disconnects Load from V
IN
Internal Oscillator: 600kHz
Short-Circuit and Overtemperature Protected
Ultrasmall Application Circuit: (0.052 Inch
2
)
6-Pin SOT-23 Package
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 V
IN
and V
OUT
) make the LTC1754
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch
2
.
The LTC1754 operates as a Burst Mode
TM
switched capaci-
tor voltage doubler to produce a regulated output. It has
thermal shutdown capability and can survive a continuous
short circuit from V
OUT
to GND.
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.
APPLICATIO S
s
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s
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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
10µF
1
2
3
V
OUT
GND
C
+
V
IN
–
6
5
4
1µF
V
IN
10µF
OUTPUT VOLTAGE (V)
LTC1754-3.3
Output Voltage vs Supply Voltage
3.40
I
OUT
= 20mA
C
OUT
= 10µf
C
FLY
= 1µF
5.15
5.10
LTC1754-X
1754 TA01
OUTPUT VOLTAGE (V)
ON/OFF
SHDN C
3.35
T
A
= 85°C
3.30
T
A
= 25°C
T
A
= –40°C
3.25
Regulated 3.3V Output from 2V to 4.4V Input
V
OUT
= 3.3V
±
4%
I
OUT
= 0mA TO 20mA, V
IN
> 2.0V
I
OUT
= 0mA TO 40mA, V
IN
> 2.5V
Regulated 5V Output from 2.7V to 5.5V Input
V
OUT
= 5V
±
4%
I
OUT
= 0mA TO 25mA, V
IN
> 2.7V
I
OUT
= 0mA TO 50mA, V
IN
> 3.0V
3.20
2.0
2.5
3.5
4.0
3.0
SUPPLY VOLTAGE (V)
4.5
1754 TA02
U
LTC1754-5
Output Voltage vs Supply Voltage
I
OUT
= 25mA
C
OUT
= 10µF
C
FLY
= 1µF
5.05
5.00
4.95
4.90
4.85
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
1574 TA03
U
U
1
LTC1754-3.3/LTC1754-5
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
OUT
1
GND 2
SHDN 3
6 C
+
5 V
IN
4 C
–
V
IN
to GND .................................................. – 0.3V to 6V
V
OUT
to GND ............................................... – 0.3V to 6V
SHDN to GND .............................................. – 0.3V to 6V
I
OUT
(Note 4) ......................................................... 75mA
V
OUT
Short-Circuit Duration ............................ Indefinite
Operating Temperature Range (Note 3) ... – 40°C to 85°C
Storage Temperature Range .................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
ORDER PART
NUMBER
LTC1754ES6-3.3
LTC1754ES6-5
S6 PART MARKING
LTGK
LTLW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 230°C/ W
Consult factory for Industrial and Military grade parts.
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. C
FLY
= 1µF (Note 2), C
IN
= 10µF, C
OUT
= 10µF.
SYMBOL
PARAMETER
LTC1754-3.3
V
IN
Input Supply Voltage
V
OUT
Output Voltage
I
CC
V
R
η
f
OSC
t
ON
I
SC
LTC1754-5
V
IN
V
OUT
Operating Supply Current
Output Ripple
Efficiency
Switching Frequency
V
OUT
Turn-On Time
Output Short-Circuit Current
Input Supply Voltage
Output Voltage
CONDITIONS
q
ELECTRICAL CHARACTERISTICS
MIN
2.0
3.17
3.17
TYP
MAX
4.4
3.43
3.43
30
UNITS
V
V
V
µA
mV
P-P
%
kHz
ms
mA
2.0V
≤
V
IN
≤
4.4V, I
OUT
≤
20mA
2.5V
≤
V
IN
≤
4.4V, I
OUT
≤
40mA
2.0V
≤
V
IN
≤
4.4V, I
OUT
= 0mA, SHDN = V
IN
V
IN
= 2.5V, I
OUT
= 40mA
V
IN
= 2.0V, I
OUT
= 20mA
Oscillator Free Running
V
IN
= 2.0V, I
OUT
= 0mA
V
IN
= 2.5V, V
OUT
= 0V, SHDN = 2.5V
q
q
q
3.30
3.30
11
23
82
600
0.8
118
q
I
CC
Operating Supply Current
V
R
Output Ripple
η
Efficiency
f
OSC
Switching Frequency
t
ON
V
OUT
Turn-On Time
I
SC
Output Short-Circuit Current
LTC1754-3.3/LTC1754-5
I
SHDN
Shutdown Supply Current
V
IH
V
IL
I
IH
I
IL
SHDN Input Threshold (High)
SHDN Input Threshold (Low)
SHDN Input Current (High)
SHDN Input Current (Low)
2.7V
≤
V
IN
≤
5.5V, I
OUT
≤
25mA
3.0V
≤
V
IN
≤
5.5V, I
OUT
≤
50mA
2.7V
≤
V
IN
≤
5.5V, I
OUT
= 0mA, SHDN = V
IN
V
IN
= 3V, I
OUT
= 50mA
V
IN
= 3V, I
OUT
= 50mA
Oscillator Free Running
V
IN
= 3V, I
OUT
= 0mA
V
IN
= 3V, V
OUT
= 0V, SHDN = 3V
V
IN
≤
3.6V, I
OUT
= 0mA, V
SHDN
= 0V
3.6V < V
IN
, I
OUT
= 0mA, V
SHDN
= 0V
q
q
q
2.7
4.8
4.8
5.0
5.0
13
65
82.7
700
0.4
150
0.01
5.5
5.2
5.2
30
mV
P-P
%
kHz
ms
mA
1
2.5
0.3
1
1
µA
µA
V
V
µA
µA
q
q
q
q
1.4
–1
–1
SHDN = V
IN
SHDN = 0V
q
q
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
FLY
capacitance for rated output
current capability. Depending on the choice of capacitor material, a
somewhat higher value of capacitor may be required to attain 0.6µF over
temperature.
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.
2
U
V
V
V
µA
W
U
U
W W
W
LTC1754-3.3/LTC1754-5
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Output Current
3.40
T
A
= 25°C
C
OUT
= 10µF
C
FLY
= 1µF
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
3.35
V
IN
= 2.5V
3.30
V
IN
= 2V
3.25
3.20
0
20
60
80
40
OUTPUT CURRENT (mA)
V
OUT
Short-Circuit Current
vs Supply Voltage
180
V
OUT
SHORT-CIRCUIT CURRENT (mA)
T
A
= 25°C
C
FLY
= 1µF
160
EFFICIENCY (%)
140
120
100
80
60
2.0
2.5
3.0
3.5
4.0
SUPPLY VOLTAGE (V)
4.5
1735 G04
Load Transient Response
I
OUT
0mA to 20mA
10mA/DIV
V
OUT
AC COUPLED
20mV/DIV
V
OUT
AC COUPLED
20mV/DIV
V
IN
= 2V
C
OUT
= 10µF
50µs/DIV
U W
1754 G01
LTC1754-3.3, T
A
= 25°C unless otherwise noted.
No Load Supply Current
vs Supply Voltage
20
I
OUT
= 0µA
C
FLY
= 1µF
V
SHDN
= V
IN
20
Supply Current vs V
SHDN
T
A
= 25°C
I
OUT
= 0µA
15
V
IN
= 2.5V
10
V
IN
= 2V
V
IN
= 4.5V
15
T
A
= 85°C
10
T
A
= 25°C
5
T
A
= – 40°C
5
100
0
2.0
2.5
3.0
3.5
4.0
SUPPLY VOLTAGE (V)
4.5
1754 G02
1
4
V
SHDN
CONTROL VOLTAGE (V)
2
3
5
1754 G03
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
100
1754 G05
T
A
= 25°C
V
IN
= 2V
C
FLY
= 1µF
Output Ripple
Start-Up Time
SHDN
1V/DIV
V
OUT
1V/DIV
1754 G07
V
IN
= 2V
C
OUT
= 10µF
I
OUT
= 20mA
5µs/DIV
1754 G08
V
IN
= 2V
C
OUT
= 10µF
200µs/DIV
1754 G9
3
LTC1754-3.3/LTC1754-5
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Output Current
5.15
5.10
OUTPUT VOLTAGE (V)
5.05
5.00
V
IN
= 2.7V
4.95
4.90
4.85
0
20
40
60
80
OUTPUT CURRENT (mA)
100
1574-5 G02
T
A
= 25°C
C
OUT
= 10µF
C
FLY
= 1µF
SUPPLY CURRENT (µA)
V
IN
= 3V
SUPPLY CURRENT (µA)
V
OUT
Short-Circuit Current
vs Supply Voltage
220
V
OUT
SHORT-CIRCUIT CURRENT (mA)
200
180
160
140
120
T
A
= 25°C
C
FLY
= 1µF
EFFICIENCY (%)
100
2.5
3.0
Load Transient Response
I
OUT
0mA to 50mA
25mA/DIV
V
OUT
AC COUPLED
20mV/DIV
V
OUT
AC COUPLED
50mV/DIV
V
IN
= 3V
C
OUT
= 10µF
50µs/DIV
4
U W
LTC1754-5, T
A
= 25°C unless otherwise noted.
No Load Supply Current
vs Supply Voltage
20
I
OUT
= 0µA
C
FLY
= 1µF
V
SHDN
= V
IN
15
25
Supply Current vs V
SHDN
T
A
= 25°C
I
OUT
= 0µA
V
IN
= 3.3V
15
V
IN
= 2.7V
10
V
IN
= 5.5V
T
A
= 85°C
20
T
A
= 25°C
10
T
A
= –40°C
5
5
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
1754 G11
0
1
2
4
5
3
V
SHDN
CONTROL VOLTAGE (V)
6
1574 G12
Efficiency vs Load Current
100
V
IN
= 3V
90 T
A
= 25°C
C
FLY
= 1µF
80
70
60
50
40
30
20
10
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
1754 G13
0
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
100
1754-5 G05
Output Ripple
SHDN
5V/DIV
Start-Up Time
V
OUT
1V/DIV
1754 G16
V
IN
= 3V
C
OUT
= 10µF
I
OUT
= 50mA
5µs/DIV
1754 G17
V
IN
= 3V
C
OUT
= 10µF
100µs/DIV
1754 G18
LTC1754-3.3/LTC1754-5
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1754-3.3. LTC1754-5, T
A
= 25°C unless otherwise noted.
Oscillator Frequency
vs Supply Voltage
850
OSCILLATOR FREQUENCY (kHz)
Efficiency vs Supply Voltage
100
90
80
T
A
= 25°C
C
FLY
= 1µF
800
750
700
650
600
550
500
THRESHOLD VOLTAGE (V)
EFFICIENCY (%)
70
60
50
40
30
2.0
LTC1754-3.3
I
OUT
= 20mA
LTC1754-5
I
OUT
= 25mA
2.5
4.5
3.0 3.5 4.0
SUPPLY VOLTAGE (V)
PI FU CTIO S
V
OUT
(Pin 1):
Regulated Output Voltage. For best perfor-
mance, V
OUT
should be bypassed with a 6.8µF (min) low
ESR capacitor as close as possible to the pin.
GND (Pin 2):
Ground. Should be tied to a ground plane for
best performance.
SHDN (Pin 3):
Active Low Shutdown Input. A low on
SHDN disables the LTC1754. SHDN must not be allowed
to float.
C
–
(Pin 4):
Flying Capacitor Negative Terminal.
V
IN
(Pin 5):
Input Supply Voltage. V
IN
should be bypassed
with a 6.8µF (min) low ESR capacitor.
C
+
(Pin 6):
Flying Capacitor Positive Terminal.
SI PLIFIED BLOCK DIAGRA
V
OUT
C
OUT
10µF
+
COMP1
CONTROL
2
C
–
1
–
V
REF
SHDN
*CHARGE PUMP SHOWN IN PHASE 1, THE CHARGING PHASE.
PHASE 1 IS ALSO THE SHUTDOWN PHASE
W
U W
5.0
1754 G19
V
SHDN
Threshold Voltage
vs Supply Voltage
0.95
0.90
T
A
= –40°C
0.85
T
A
= 25°C
0.80
T
A
= 85°C
0.75
0.70
0.65
2.0
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
5.5
450
2.0
2.5
3.0
3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0
5.5
2.5
3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0
5.5
1754 G20
1754 G21
U
U
W
U
*
2
1
C
+
C
FLY
1µF
V
IN
C
IN
10µF
1754 BD
5
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