LTC1517CS5-5 [Linear]
Micropower, Regulated 5V Charge Pump in a 5-Pin SOT-23 Package; 微功耗， 5V稳压电荷泵，一个5引脚SOT- 23封装
| 型号： | LTC1517CS5-5 |
| 厂家： | 
Linear |
| 描述： | Micropower, Regulated 5V Charge Pump in a 5-Pin SOT-23 Package |
| 文件： | 总8页 (文件大小：214K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1517-5
Micropower, Regulated
5V Charge Pump in a
5-Pin SOT-23 Package
U
FEATURES
DESCRIPTION
The LTC®1517-5 is a micropower charge pump DC/DC
converter that produces a regulated 5V output. The input
voltage range is 2.7V to 5V. Extremely low operating current
(typically6µAwithnoload)andlowexternalpartscount(one
0.1µFflyingcapacitorandtwosmallbypasscapacitorsatVIN
and VOUT) 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.
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.
■
Ultralow Power: ICC = 6µA Typ
■
Short-Circuit/Thermal Protected
5V ±4% Regulated Output
VIN Range: 2.7V to 5V
■
■
■
Output Current: 10mA (VIN
20mA (VIN
≥
≥
2.7V)
3V)
■
■
■
■
No Inductors
Ultrasmall Application Circuit (0.045in2)
800kHz Switching Frequency
Available in 5-Pin SOT-23
U
APPLICATIONS
■
Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
■
Battery-Operated Equipment
■
Local Power Supplies
■
Handheld Instruments
■
PCMCIA Supplies
U
TYPICAL APPLICATION
Typical Output Voltage vs Output Current
5.2
0.1µF
T
= 25°C
A
C1 = 0.1µF
C
= 6.8µF
OUT
5
–
4
+
5.1
5.0
4.9
4.8
C1
C1
LTC1517-5
V
IN
GND
2
V
OUT
3
V
I
I
= 5V ± 4%
1
OUT
OUT
OUT
V
IN
= 10mA (V ≥ 2.7V)
IN
2.7V TO 5V
= 20mA (V ≥ 3V)
IN
3.3µF
6.8µF
V
= 2.7V
V
V
= 3V
= 3.3V
IN
IN
IN
1517 TA01
40
60
0
80
20
OUTPUT CURRENT (mA)
1517 TA02
1
LTC1517-5
W W
U W
U
W U
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
ORDER PART
VIN to GND...................................................–0.3V to 6V
VOUT to GND ................................................–0.3V to 6V
TOP VIEW
NUMBER
–
1
2
3
V
C1
5
IN
V
OUT Short-Circuit Duration............................. Indefinite
LTC1517CS5-5
GND
Operating Temperature Range:
+
V
4
C1
OUT
Commercial (Note 2) .............................. 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
S5 PART MARKING
LTCJ
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 256°C/ W
Consult factory for Industrial and Military grade parts and for -3 and -3.3
version availability.
ELECTRICAL CHARACTERISTICS
VIN = 2.7V to 5V, 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
●
2.7
5
V
IN
2.7V ≤ V ≤ 5V, I ≤ 10mA
OUT
●
●
4.8
4.8
5.0
5.0
5.2
5.2
V
V
OUT
IN
3V ≤ V ≤ 5V, I
≤ 20mA
IN
OUT
I
Input Supply Current
2.7V ≤ V ≤ 5V, I = 0
OUT
●
6
75
800
1
15
µA
CC
IN
V
OUT
Ripple
V
IN
= 3V, I
= 20mA, C
= 6.8µF
mV
P-P
OUT
OUT
f
t
Oscillator Frequency
Turn-On Time
kHz
ms
OSC
ON
V
OUT
V
IN
= 3V
The
● denotes specifications that apply over the full operating
Note 2: Commercial grade parts are designed to operate over the
temperature range of –40°C to 85°C but are neither tested nor guaranteed
temperature range.
beyond 0°C to 70°C.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
2
LTC1517-5
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs Input Voltage
Efficiency vs Input Voltage
Output Ripple vs Input Voltage
250
200
150
100
50
5.15
5.10
5.05
5.00
4.95
4.90
90
80
70
60
50
40
I
= 10mA
I
= 10mA
OUT
I
= 10mA
OUT
OUT
OUT
A
C1 = 0.1µF
= 25°C
C
= 10µF
T
= 25°C
T
A
C
= 3.3µF
OUT
T
= 70°C
= 25°C
A
C
= 6.8µF
OUT
T
= 0°C
A
C
= 10µF
= 22µF
T
OUT
A
C
OUT
0
2.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1517-5 G03
1517-5 G01
1517-5 G02
No Load Input Current
vs Input Voltage
Load Transient Response
Efficiency vs Output Current
90
80
70
60
50
9
8
7
6
5
4
V
= 3V
I
= 0mA
IN
OUT
SHDN = 0V
= 25°C
T
A
IOUT
0mA to 10mA
10mA/DIV
T
= 70°C
A
T
= 25°C
A
VOUT
AC COUPLED
50mV/DIV
T
= 0°C
A
V
IN = 3V
500µs/DIV
1517-5 G06
COUT = 6.8µF
2.5
3.0
3.5
4.0
4.5
5.0
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
1517-5 G04
1517-5 G05
3
LTC1517-5
U
U
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PIN FUNCTIONS
VIN (Pin 1): Charge Pump Input Voltage. May be between
2.7V and 5V. VIN should be bypassed with a ≥3.3µF low
ESR capacitor as close as possible to the pin 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.
C1+ (Pin 4): Charge Pump Flying Capacitor Positive
Terminal.
GND (Pin 2): Ground. Should be tied to a ground plane for
best performance.
C1– (Pin 5): Charge Pump Flying Capacitor Negative
Terminal.
W
W
SI PLIFIED BLOCK DIAGRA
C1
0.1µF
–
+
C1
C1
V
IN
V
CHARGE PUMP
OUT
C
IN
3.75M
C
OUT
+
–
800kHz
OSC
1.25M
THERMAL
SHDN
1.25V
REF
LTC1517-5
1517 BD
4
LTC1517-5
U
W U U
APPLICATIONS INFORMATION
Operation
Output Ripple
The LTC1517-5 uses a switched-capacitor charge pump
to boost VIN to a 5V ±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
freerunningfrequencyof800kHz(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
chargepumponandoffenablestheLTC1517-5toachieve
high efficiency at extremely low output loads.
Normal LTC1517-5 operation produces voltage ripple on
the VOUT pin. Output voltage ripple is required for the part
to regulate. Low frequency ripple exists due to the hyster-
esisinthesensecomparatorandpropagationdelaysinthe
chargepumpenable/disablecircuits.Highfrequencyripple
is also present mainly from the ESR (equivalent series
resistance) in the output capacitor. Typical output ripple
withVIN =3Vundermaximumloadis100mVpeak-to-peak
withalowESR(<0.5Ω)3.3µFoutputcapacitor(minimum
recommended COUT). For applications requiring VIN to
exceed 3.3V or for applications requiring < 100mV 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.
Short-Circuit/Thermal Protection
During short-circuit conditions, the LTC1517-5 will draw
between 50mA and 200mA 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 LTC1517-5 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 and
lowest ESR 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 ca-
pacitor C1 with values of 0.1µF or 0.22µF. Smaller value
flying capacitors may be used in low IOUT applications.
5
LTC1517-5
U
TYPICAL APPLICATIONS
Low Noise Boosted 5V Supply
0.1µF
5
–
4
+
C1
C1
50mV/DIV
AC COUPLED
A
LTC1517-5
V
GND
2
V
OUT
3
IN
A
1
V
IN
3.3V TO 5V
VOUT
2mV/DIV
AC COUPLED
1µF
470Ω
470Ω
1µF
B
Q1
V
I
I
= 5V
B
3.3µF
OUT
OUT
OUT
= 1mA (V ≥ 3.3V)
IN
Q2
= 10mA (V ≥ 3.6V)
1µF
1µF
IN
V
< 2mV
Q1, Q2: 2N3904
RIPPLE
P-P
1517-5 TA04b
1517 TA04a
VIN = 3.3V
IOUT = 1mA
50µs/DIV
Generating 5V and a Negative Supply
0.1µF
5
–
4
+
C1
C1
LTC1517-5
V
GND
2
V
OUT
3
IN
V
= 5V ±4%
1
OUT
V
IN
I
I
= 10mA (2.7V ≤ V ≤ 5V)
OUT
OUT
IN
2.7V TO 5V
= 20mA (3V ≤ V ≤ 5V)
IN
3.3µF
3.3µF
470Ω
8.2k
Q1
**
Q2
3.3k
0.1µF
–V
–I
= –1.4V TO –3.5V
= 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
LTC1517-5
U
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
LTC1517-5
U
TYPICAL APPLICATION
3.3V to 1.9V, 6A Power Supply
V
IN
3.3V
C1
Y5V CERAMIC
3.3µF
C6 TO C9*
+
5
4
1
330µF
C3
0.22µF
6.3V
R2
24k
2
3
C10
C11
1µF
LTC1517-5
× 4
0.1µF
L1
C2
Y5V CERAMIC
10µF
2.4µH, 8A
SUMIDA
Q1
Si4410
CDRH127-2R4
V
1.9V
6A
OUT
5V
D2
MBRS120
Q2
R3
1k
R5
4.99K
1%
C4
C16
0.018µF
Si4410
C17 TO C21 *
330µF
+
0.1µF
6.3V
LTC1430CS
D1
BAT54
R6
10K
1%
1
16
× 5
G1
PV
G2
2
3
4
5
6
7
8
15
14
13
12
11
10
9
PV
CC2
CC1
PGND
GND
SENSE
FB
SENSE
SHDN
V
CC
C5
1µF
I
FB
–
+
I
MAX
R4
FREQSET
COMP
SS
5.2k
ON OFF
C15
10µF
+
C14
0.012µF
C12
0.1µF
C13
390pF
R1
100Ω
10V
1517 TA03
*AVX TPS TANTALUM
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
3.3V or 5V Output Up to 50mA
LTC1514-X
Step-Up/Step-Down Switched-Capacitor DC/DC Converter with
Low Battery Comparator
LTC1515 Series
LTC1516
Step-Up/Step-Down Switched-Capacitor DC/DC Converter with Reset
Micropower Regulated 5V Charge Pump DC/DC Converter
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
LTC1522
Same as LTC1517-5 with Shutdown, Available in MSOP
15175f LT/TP 0298 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1997
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
8
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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