LTC1517CS5-3.3 [Linear]
Micropower, Regulated 3.3V Charge Pump in a 5-Pin SOT-23 Package; 微功耗， 3.3V稳压电荷泵采用5引脚SOT- 23封装
| 型号： | LTC1517CS5-3.3 |
| 厂家： | 
Linear |
| 描述： | Micropower, Regulated 3.3V Charge Pump in a 5-Pin SOT-23 Package |
| 文件： | 总8页 (文件大小：215K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1517-3.3
Micropower, Regulated
3.3V Charge Pump in a
5-Pin SOT-23 Package
U
FEATURES
DESCRIPTION
The LTC®1517-3.3 is a micropower charge pump DC/DC
converter that produces a regulated 3.3V output. The input
voltage range is 2V to 4.4V, allowing a single cell lithium
battery to produce a regulated 3.3V output over the entire life
of the battery. Extremely low operating current (typically 6µA
with no load) and low external parts count (one 0.1µF flying
■
Ultralow Power: ICC = 6µA Typ
■
Short-Circuit/Thermal Protected
3.3V ±4% Regulated Output
VIN Range: 2V to 4.4V
■
■
■
Output Current: 8mA (VIN
≥
2V)
2.5V)
15mA (VIN
≥
■
■
■
■
No Inductors
capacitor and two small bypass capacitors at VIN and VOUT
)
Ultrasmall Application Circuit (0.045in2)
700kHz Switching Frequency
make the part ideally suited for small, light load battery-
powered applications. The total printed circuit board area of
the application circuit shown below is only 0.045in2.
Available in 5-Pin SOT-23
The part operates as a Burst ModeTM switched-capacitor
voltage doubler to produce a regulated output. The part has
thermal shutdown capability and can survive a continuous
short circuit from VOUT to GND. The device is available in a
5-pin SOT-23 package.
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APPLICATIONS
■
Cellular Telephones
■
Battery-Operated Equipment
■
Local Power Supplies
■
Handheld Instruments
PCMCIA Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
■
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TYPICAL APPLICATION
Typical Output Voltage
vs Output Current
3.40
0.1µF
T
= 25°C
A
C1 = 0.1µF
C
= 6.8µF
OUT
5
–
4
+
3.35
3.30
3.25
3.20
C1
C1
LTC1517-3.3
V
GND
2
V
IN
OUT
3
V
IN
= 2.5V
V
I
I
= 3.3V ± 4%
V
= 2V
IN
1
OUT
OUT
OUT
V
IN
2V TO 4.4V
= 8mA (V ≥ 2V)
IN
= 15mA (V ≥ 2.5V)
IN
3.3µF
6.8µF
1517-3.3 TA01
20
30
0
40
10
OUTPUT CURRENT (mA)
1517 G05
1
LTC1517-3.3
W W U W
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ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
ORDER PART
VIN to GND...................................................–0.3V to 6V
VOUT to GND ................................................–0.3V to 6V
NUMBER
TOP VIEW
–
1
2
3
V
C1
5
IN
V
OUT Short-Circuit Duration............................. Indefinite
LTC1517CS5-3.3
GND
Operating Temperature Range:
+
V
4
C1
Commercial (Note 2) .............................. 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
OUT
S5 PACKAGE
5-LEAD PLASTIC SOT-23
S5 PART MARKING
LTEF
TJMAX = 125°C, θJA = 256°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
VIN = 2V to 4.4V, C1 = 0.1µF, CIN = 3.3µF, COUT = 6.8µF, TMIN to TMAX, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
Operating Input Voltage
Output Voltage
●
2.0
4.4
V
IN
2V ≤ V ≤ 4.4V, I ≤ 8mA
OUT
●
●
3.17
3.17
3.3
3.3
3.43
3.43
V
V
OUT
IN
2.5V ≤ V ≤ 4.4V, I
≤ 15mA
IN
OUT
I
Input Supply Current
2V ≤ V ≤ 4.4V, I = 0
OUT
●
6
50
700
1
15
µA
CC
IN
V
OUT
Ripple
V
IN
= 2.5V, I
= 15mA, C
= 6.8µF
mV
P-P
OUT
OUT
f
t
I
Oscillator Frequency
Turn-On Time
kHz
ms
mA
OSC
ON
V
OUT
V
V
= 2.5V
= 3V
IN
Output Short-Circuit Current
60
SC
IN
The
● denotes specifications that apply over the full operating
Note 2: Commercial grade parts are designed to operate over the
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
temperature range of –40°C to 85°C but are neither tested nor guaranteed
beyond 0°C to 70°C.
of the device may be impaired.
2
LTC1517-3.3
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TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs Input Voltage
Efficiency vs Input Voltage
Output Ripple vs Input Voltage
3.40
3.35
3.30
3.25
3.20
100
80
60
40
20
200
150
100
50
I
= 8mA
OUT
I
= 8mA
I
= 8mA
OUT
OUT
OUT
C
= 6.8µF
T
= 25°C
A
C1 = 0.1µF
C
T
= 3.3µF
= 25°C
IN
A
C
OUT
= 3.3µF
T
= 70°C
= 0°C
A
T
A
T
A
= 25°C
C
= 6.8µF
= 10µF
4.0
OUT
C
OUT
0
2.0
2.5
3.0
3.5
4.0
4.5
2.0
2.5
3.0
3.5
4.0
4.5
2.0
2.5
3.0
3.5
4.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1517 G01
1517 G02
1517 G03
No Load Input Current vs
Input Voltage
Typical Efficiency vs
Output Current
Load Transient Response
10
8
100
80
60
40
20
0
I
= 0mA
T
= 25°C
OUT
A
C1 = 0.1µF
V
= 2V
IOUT
0mA to 10mA
5mA/DIV
IN
C
= 6.8µF
OUT
V
= 2.5V
IN
T
= 70°C
A
T
VOUT
AC COUPLED
50mV/DIV
6
T
= 25°C
A
= 0°C
A
4
V
IN = 2.5V
500µs/DIV
C
OUT = 6.8µF
1517 G06
2
2.0
2.5
3.0
3.5
4.0
4.5
0.001
0.01
0.1
1
10
100
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1517 G04
1517 TA02
Typical Output Current
vs Temperature
VOUT Short-Circuit Current
vs Input Voltage
200
50
40
30
20
10
0
T = 25°C
A
C1 = 0.1µF
V
= 3.3V
OUT
C1 = 0.1µF
160
120
80
V
V
= 2.7V
= 2.5V
IN
IN
V
IN
= 2V
40
0
2.0
2.5
3.0
3.5
4.0
4.5
–50
0
25
50
75
100
–25
TEMPERATURE (°C)
INPUT VOLTAGE (V)
1517 G10
1517 G09
3
LTC1517-3.3
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TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency vs
Oscillator Frequency vs
Temperature
Input Voltage
900
800
700
600
500
400
900
V
IN
= 2.5V
T
= 25°C
A
800
700
600
500
–50
0
25
50
75
100
–25
2.0
2.5
3.0
3.5
4.0
4.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
1517 G08
1517 G07
U
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PIN FUNCTIONS
C1+ (Pin 4): Charge Pump Flying Capacitor Positive
Terminal.
C1– (Pin 5): Charge Pump Flying Capacitor Negative
Terminal.
VIN (Pin 1): Charge Pump Input Voltage. May be between
2V and 4.4V. VIN should be bypassed with a ≥3.3µF low
ESR capacitor as close as possible to the pin for best
performance.
GND (Pin 2): Ground. Should be tied to a ground plane for
best performance.
VOUT (Pin 3): Regulated Output Voltage. VOUT should be
bypassed with a ≥3.3µF low ESR capacitor as close as
possible to the pin for best performance.
W
W
SI PLIFIED BLOCK DIAGRA
C1
0.1µF
–
+
C1
C1
V
IN
V
CHARGE PUMP
OUT
C
IN
2.05M
C
OUT
+
–
700kHz
OSC
1.25M
THERMAL
SHDN
1.25V
REF
1517-3.3 BD
4
LTC1517-3.3
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APPLICATIONS INFORMATION
Operation
Output Ripple
Normal LTC1517-3.3 operation produces voltage ripple
on the VOUT pin. Output voltage ripple is required for the
parts to regulate. Low frequency ripple exists due to the
hysteresis in the sense comparator and propagation de-
lays in the charge pump enable/disable circuits. High
frequency ripple is also present mainly from the ESR
(equivalent series resistance) in the output capacitor.
Typical output ripple with VIN = 2.5V under maximum load
is75mVpeak-to-peakwithalowESR3.3µFoutputcapaci-
tor (minimum recommended COUT). For applications
requiring VIN to exceed 3.3V or for applications requiring
less than 75mV of peak-to-peak ripple, a 6.8µF to 10µF
COUT capacitor is recommended. Slight further decreases
in output ripple can be achieved by using COUT capacitors
larger than 10µF.
TheLTC1517-3.3usesaswitched-capacitorchargepump
to boost VIN to a 3.3V ±4% regulated output. The part
achieves regulation by sensing the output voltage through
an internal resistor divider and enabling the charge pump
when the divided output droops below the comparator’s
lower trip point (set by VREF). When the charge pump is
enabled, a 2-phase nonoverlapping clock controls the
internal charge pump switches. Flying capacitor C1 is
charged to VIN on phase one of the clock. On phase two of
the clock, C1 is stacked in series with VIN and connected
to VOUT through an internal switch. This sequence of
charging and discharging the flying capacitor occurs at a
freerunningfrequencyof700kHz(typ)andcontinuesuntil
the divided output voltage reaches the upper trip point of
the comparator. Once the output is back in regulation, the
charge pump is disabled. This method of bursting the
charge pump on and off enables the LTC1517-3.3 to
achieve high efficiency at extremely low output loads.
Short-Circuit/Thermal Protection
Duringshort-circuitconditions,theLTC1517-3.3willdraw
between 20mA and 150mA from VIN, causing a rise in
junctiontemperature. On-chipthermalshutdowncircuitry
disables the charge pump once the junction temperature
exceeds approximately 160°C. The charge pump is
reenabledoncethejunctiontemperaturedropstoapproxi-
mately 145°C. The LTC1517-3.3 will cycle in and out of
thermal shutdown indefinitely without latchup or damage
until the VOUT short is removed.
Capacitor Selection
For best performance, it is recommended that low ESR
capacitors be used for both CIN and COUT to reduce noise
and ripple. The CIN and COUT capacitors should be either
ceramic or tantalum and should be 3.3µF or greater.
Ceramic capacitors will provide the smallest size for a
given capacitance. If the input source impedance is very
low (< 0.5Ω), CIN may not be needed. Ceramic capacitors
are recommended for the flying capacitor C1 with values
of 0.1µF or 0.22µF. Smaller value flying capacitors may be
used in low IOUT applications.
5
LTC1517-3.3
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TYPICAL APPLICATIONS
Low Noise Boosted 3.3V Supply
0.1µF
5
–
4
+
C1
C1
50mV/DIV
AC COUPLED
A
LTC1517-3.3
V
GND
2
V
OUT
3
IN
A
1
V
IN
V
OUT
2.7V TO 4.4V
B
2mV/DIV
AC COUPLED
3.3µF
470Ω
470Ω
3.3µF
3.3µF
Q1
B
V
I
= 3.3V
= 8mA
OUT
OUT
Q2
1µF
V
= 2.7V
= 5mA
10µs/DIV
V
= 2mV
P-P
Q1, Q2: 2N3904
IN
RIPPLE
1517 TA04a
1517 TA04b
I
OUT
Generating 3.3V and a Negative Supply
0.1µF
5
–
4
+
C1
C1
LTC1517-3.3
V
GND
2
V
OUT
3
IN
1
V
I
I
= 3.3V ±4%
OUT
OUT
OUT
V
IN
= 5mA (2V ≤ V ≤ 4.4V)
IN
2V TO 4.4V
= 10mA (2.5V ≤ V ≤ 4.4V)
IN
3.3µF
3.3µF
470Ω
21.5k
Q1
**
Q2
10k
0.1µF
–V
–I
= –0.8V TO –3V
= 0mA to 5mA
OUT
OUT
1517 TA05
3.3µF
*
*CENTRAL SEMICONDUCTOR CMPSH-35 DUAL SCHOTTKY
**OPTIONAL CIRCUITRY FOR MAINTAINING –V WITH LOW
OUT
V
LOADS
OUT
Q1, Q2: 2N3904
6
LTC1517-3.3
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PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S5 Package
5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
2.80 – 3.00
(0.110 – 0.118)
(NOTE 3)
0.95
(0.037)
REF
1.90
(0.074)
REF
2.60 – 3.00
(0.102 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
0.00 – 0.15
(0.00 – 0.006)
0.90 – 1.45
(0.035 – 0.057)
0.10 – 0.60
(0.004 – 0.024)
REF
0.35 – 0.50
(0.014 – 0.020)
FIVE PLACES (NOTE 2)
0.90 – 1.30
(0.035 – 0.051)
S5 SOT-23 0797
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1517-3.3
TYPICAL APPLICATION
U
Low Power Battery Backup Supply with Autoswitchover and No Reverse Current
V
= 3.3V,
OUT
OUT
OUT
MAIN
SUPPLY
5V
3
1
I
= 300mA
LT1521-3.3
2
(I
= 8mA IN
BACKUP MODE)
1µF
1.5µF
BAT54
0.1µF
TRICKLE CHARGE
AND LTC1517-3.3
DD
75k
I
5
4
SILICONIX
Si2301DS
1
3
3
LTC1517-3.3
2
2-CELL
3.3µF
3.3µF
NiCd
7
1.1M
3.9V
TRIP
+
–
8
LOGIC LOW = BACKUP MODE
4
5
470k
1517-3.3 TA03
LTC1540
6
2
1
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1514-X
Step-Up/Step-Down Switched-Capacitor DC/DC Converter with
Low Battery Comparator
3.3V or 5V Output up to 50mA
LTC1515
LTC1516
LTC1517-5
LTC1522
Step-Up/Step-Down Switched-Capacitor DC/DC Converter with POR
Micropower Regulated 5V Charge Pump DC/DC Converter
Micropower Regulated 5V Charge Pump in a 5-Pin SOT-23 Package
Micropower Regulated 5V Charge Pump DC/DC Converter
Fixed or Adjustable Output up to 50mA
20mA for V ≥ 2V, 50mA for V ≥ 3V
IN
IN
I
up to 20mA
OUT
Same as LTC1517-5 with Shutdown
15173f LT/TP 0998 4K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1998
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