LTC1515IS8-3/5#TRPBF [Linear]
LTC1515 - Step-Up/Step-Down Switched Capacitor DC/DC Converters with RESET; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;
| 型号： | LTC1515IS8-3/5#TRPBF |
| 厂家： | 
Linear |
| 描述： | LTC1515 - Step-Up/Step-Down Switched Capacitor DC/DC Converters with RESET; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 光电二极管 |
| 文件： | 总8页 (文件大小：211K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1515 Series
Step-Up/Step-Down
Switched Capacitor DC/DC
Converters with Reset
U
DESCRIPTION
FEATURES
■
Adjustable/Selectable 3V, 3.3V or 5V
The LTC®1515, LTC1515-3/5 and LTC1515-3.3/5 are
micropower switched capacitor DC/DC converters that
produce a regulated output voltage by either stepping up
or stepping down the input voltage. Output voltage is
adjustable using an external resistor divider (LTC1515) or
programmable to either 3V/5V (LTC1515-3/5) or 3.3V/5V
(LTC1515-3.3/5) using a logic pin.
Output Voltages
■
2V to 10V Input Voltage Range
■
Up to 50mA Output Current
■
Only Three External Capacitors Required
■
Soft Start Limits Inrush Current at Turn-On
■
Low Operating Current: 60µA
■
Very Low Shutdown Current: < 1µA
A unique architecture allows the parts to accommodate a
wide input voltage range (2V to 10V) while maintaining
±4% regulation. Additional circuitry prevents excessive
inrush current and output voltage ripple when large VIN to
VOUT differentials are present.
■
Shutdown Disconnects Load from VIN
■
VOUT Programmable to 3V/5V or 3.3V/5V
■
Short-Circuit and Overtemperature Protected
■
650kHz Switching Frequency
■
Open-Drain Power-On Reset Output
■
Daisy-Chained Control Outputs
An internal power-on reset circuit forces the POR pin low
on initial power-up. The POR output remains low until
200ms (typ) after VOUT is in regulation.
Available in SO-8 Package
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APPLICATIONS
Thepartsareshort-circuitandovertemperatureprotected.
Battery life is maximized by very low operating currents
(ICC = 60µA typ, ICC < 1µA in shutdown). All three parts are
available in an SO-8 package.
■
SIM Interface in GSM Cellular Telephones
■
Smart Card Readers
■
Local Power Supplies
Portable Equipment
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
LTC1515-X 5V Output vs Input Voltage
Programmable 3.3V/5V Power Supply with Power-On Reset
5.2
100k
I
= 10mA
OUT
5/3 = 3V
1
2
3
4
8
7
6
5
V
= 3.3V OR 5V
= 50mA
OUT
OUT
5.1
5.0
4.9
4.8
SHDN
POR
LTC1515-3.3/5
5/3
V
OUT
ON OFF
RESET
I
V
IN
+
+
+
V
IN
10µF
10µF
4-CELL
NiCd
5V 3.3V
C1
0.22µF
–
GND
C1
LTC1515 • TA01
2
3
4
5
6
7
8
9
10
INPUT VOLTAGE (V)
LT1515 • TA02
1
LTC1515 Series
W W U W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN to GND................................................ –0.3V to 12V
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ............................................ –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
V
OUT to GND ............................................. –0.3V to 12V
SHDN, 5/3, FB to GND.............................. – 0.3V to 12V
VOUT Short-Circuit Duration............................. Indefinite
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/O
PACKAGE RDER I FOR ATIO
ORDER PART NUMBER
ORDER PART
TOP VIEW
TOP VIEW
NUMBER
LTC1515CS8-3/5
SHDN
POR
5/3
1
2
3
4
8
7
6
5
V
V
OUT
SHDN
POR
FB
1
2
3
4
8
7
6
5
V
V
OUT
LTC1515CS8-3.3/5
LTC1515IS8-3/5
LTC1515IS8-3.3/5
LTC1515CS8
LTC1515IS8
IN
+
IN
+
C1
C1
C1
C1
–
–
GND
GND
S8 PART MARKING
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PACKAGE
8-LEAD PLASTIC SO
151535
515335
1515
1515I
515I35
15I335
TJMAX = 125°C, θJA = 110°C/W
TJMAX = 125°C, θJA = 110°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VIN = 2V to 10V, SHDN = 3V, C1 = 0.22µF, CIN = COUT = 10µF unless otherwise noted (Note 2).
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
V
Operating Voltage
V
V
V
= 5V
= 3V/3.3V
= ADJ
●
●
●
2.7
2.0
2.0
10
8
10
V
V
V
IN
OUT
OUT
OUT
V
V
V
= 3V (LTC1515-3/5)
2V ≤ V ≤ 8V, I
≤ 15mA
≤ 50mA
●
●
2.88
2.88
3.0
3.0
3.12
3.12
V
V
OUT
OUT
OUT
IN
OUT
OUT
3V ≤ V ≤ 8V, I
IN
= 3.3V (LTC1515-3.3/5)
2V ≤ V ≤ 8V, I
≤ 15mA
≤ 50mA
●
●
3.17
3.17
3.3
3.3
3.43
3.43
V
V
IN
OUT
OUT
3V ≤ V ≤ 8V, I
IN
= 5V (LTC1515-3/5, LTC1515-3.3/5)
2.7V ≤ V ≤ 10V, I
≤ 15mA
≤ 50mA
●
●
4.8
4.8
5.0
5.0
5.2
5.2
V
V
IN
OUT
OUT
3.3V ≤ V ≤ 10V, I
IN
V
V
Feedback Voltage
LTC1515, V Ramping Negative
●
1.190
1.232
1
1.275
V
%
Ω
FB
FB
FB
Feedback Hysteresis
LTC1515
Effective Output Resistance
LTC1515, V = 3V, Step-Up Mode
IN
●
30
V
Operating Current
V
V
≤ 5V, I
> 5V, I
= 0, SHDN = 3V
= 0, SHDN = 3V
●
●
60
75
100
135
µA
µA
IN
IN
IN
OUT
OUT
V
Shutdown Current
SHDN = 0V, V ≤ 5V
●
1
25
µA
µA
IN
IN
SHDN = 0V, V > 5V
IN
Output Ripple
Full Load (Note 2)
Full Load
100
650
mV
P-P
Switching Frequency
5/3, SHDN Input Threshold
●
500
0.4
800
1.6
kHz
V
V
●
●
1.0
1.0
V
V
IL
IH
5/3, SHDN Input Current
5/3, SHDN = V
●
●
–1
–1
1
1
µA
µA
IN
5/3, SHDN = 0V
FB Input Current
FB = 1.232V
●
●
–50
50
nA
V
POR Output Low Voltage
I
= 100µA, V = 3V
0.05
0.4
SINK
IN
2
LTC1515 Series
ELECTRICAL CHARACTERISTICS
VIN = 2V to 10V, SHDN = 3V, C1 = 0.22µF, CIN = COUT = 10µF unless otherwise noted (Note 2).
PARAMETER
CONDITIONS
MIN
–1
TYP
MAX
1
UNITS
µA
POR Leakage Current
V
V
= 5V
●
●
POR
OUT
POR Trip Point (With Respect to V
POR Trip Point Hysteresis
)
Ramping Negative
–10
–7.5
1
–5
%
OUT
%
I
t
Short-Circuit Current
V
= 0V
●
12
4
40
mA
ms
ms
OUT
ON
OUT
Soft Start Turn-On Time
After V Above POR Threshold
POR Delay
●
140
200
280
OUT
Note 2: For V ≥ 8V, C
= 22µF.
The denotes specifications which apply over the full operating
●
IN
OUT
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC1515-X
3.3V Efficiency vs Output Current
LTC1515-X 3.3V Output Voltage
Ripple vs Input Voltage
LTC1515-X
5V Efficiency vs Output Current
100
80
60
40
20
0
100
80
60
40
20
0
250
200
150
100
50
V
T
= 3.3V
V
I
A
= 3.3V
OUT
OUT
= 25°C
OUT
A
V
= 6V
V
= 2.7V
IN
= 25°C
= 10mA
IN
V
= 2V
IN
T
V
= 4.4V
= 2.7V
IN
V
= 3.3V
IN
V
IN
V
IN
= 8V
C
= 10µF
OUT
V
= 6V
IN
C
= 22µF
OUT
C
= 47µF
OUT
V
A
= 5V
OUT
T
= 25°C
0
0.01
0.1
1
10
100
0.01
0.1
1
10
100
0
2
4
6
8
10
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
1515 G01
1515 G02
1515 G03
LTC1515-X 3.3V Output Voltage
vs Input Voltage
LTC1515-X Operating Current
vs Input Voltage
LTC1515-X 5V Output Voltage
Ripple vs Input Voltage
3.45
3.40
3.35
3.30
3.25
3.20
120
100
80
250
200
150
100
50
V
I
= 5V
OUT
OUT
V
I
A
= 5V
V
I
= 3.3V
= 10mA
= 10µF
OUT
OUT
OUT
OUT
C
OUT
= 0mA
= 10mA
T
= 25°C
T
A
= 25°C
C
= 10µF
OUT
25°C
85°C
C
= 22µF
OUT
60
–40°C
C
= 47µF
OUT
40
20
0
0
2
4
6
8
10
0
2
4
6
8
10
0
2
4
6
8
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1515 G05
1515 G06
1515 G04
3
LTC1515 Series
TYPICAL PERFORMANCE CHARACTERISTICS
U W
LTC1515-X
3.3V Efficiency vs Input Voltage
LTC1515-X
5V Efficiency vs Input Voltage
LTC1515-X
3V Efficiency vs Input Voltage
100
80
100
80
100
80
60
40
20
V
I
A
= 3V
V
I
= 3.3V
V
I
= 5V
OUT
OUT
TA = 25°C
OUT
= 10mA
OUT
OUT
= 10mA
= 10mA
OUT
T
= 25°C
TA = 25°C
60
60
40
40
20
20
0
2
4
6
8
10
0
2
4
6
8
10
2
4
6
8
10
12
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1515 G09
1515 G07
1515 G08
LTC1515-X Shutdown Supply
Current vs Input Voltage
LTC1515-X Step-Down Mode
5V Load Transient Response
LTC1515-X Step-Up Mode
5V Load Transient Response
25
20
15
10
5
SHDN = 0V
VOUT
AC COUPLED
100mV/DIV
VOUT
AC COUPLED
100mV/DIV
50mA
0mA 50mA/DIV
IOUT
IOUT
50mA/DIV
85°C
25°C
–40°C
VIN = 8V, VOUT = 5V, COUT = 10µF, TA = 25°C
VIN = 3.3V, VOUT = 5V, COUT = 10µF, TA = 25°C
1515 G10
1515 G11
0
0
2
4
6
8
10
INPUT VOLTAGE (V)
1515 G12
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PIN FUNCTIONS
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN
pin puts the part into shutdown mode. A logic high (VSHDN
≥ 1.6V) enables the part. At high VIN voltages, the SHDN
pin may still be controlled with 3V logic without causing a
large rise in VIN quiescent current. The SHDN pin may not
float; connect to VIN if unused.
low will force VOUT to 3V (LTC1515-3/5) or 3.3V (LTC1515-
3.3/5). AswiththeSHDNpin, the5/3pinmaybedrivenwith
3V logic over the entire VIN range. The 5/3 pin may not float.
FB (LTC1515) (Pin 3): Feedback Input. The voltage on this
pin is compared to the internal reference voltage (1.232V)
to keep the output in regulation. An external resistor divider
is required between VOUT and FB to adjust the output
voltage. Total divider resistance should not exceed 2M.
POR(Pin2):Open-DrainPower-OnResetOutput.Thispin
will pull low upon initial power-up, during shutdown or
until VOUT has been within 6.5% of its regulated value for
more than 200ms typ.
GND (Pin 4): Ground. Should be tied to a ground plane for
best performance.
C1– (Pin 5): Charge Pump Flying Capacitor, Negative
Terminal.
5/3 (LTC1515-X) (Pin 3): Output Voltage Select. A logic
high on the 5/3 pin will force VOUT to regulate to 5V. A logic
4
LTC1515 Series
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U
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PIN FUNCTIONS
C1+ (Pin 6): Charge Pump Flying Capacitor, Positive
Terminal.
V
OUT (Pin 8): Regulated Output Voltage. Pin selectable to
either 3V/5V, 3.3V/5V or adjustable using an external
resistordivider(LTC1515). VOUT shouldbebypassedwith
a ≥ 10µF low ESR capacitor as close as possible to the pin
for best performance.
VIN (Pin 7): Charge Pump Input Voltage. May be between
2V and 10V. VIN should be bypassed with a ≥ 10µF low
ESR capacitor as close as possible to the pin for best
performance.
W
W
SI PLIFIED BLOCK DIGRAM
–
+
C1
C1
V
IN
STEP-UP/STEP-DOWN
CHARGE PUMP
V
OUT
(LTC1515-X)
(LTC1515-X)
SHDN
–
+
EN
EN
650kHz
OSCILLATOR
FB
POR
–
+
(LTC1515)
RESET
COUNTER
V
OS
5/3
(LTC1515-X)
1.232V
REF
V
LTC1515 • BD
GND
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APPLICATIONS INFORMATION
Regulator Operation
Each part’s charge pump has a unique architecture that
allows the input voltage to be either stepped up or stepped
down to produce a regulated output. Internal circuitry
sensestheVIN toVOUT differentialvoltageandcontrolsthe
charge pump operating mode. In addition, the effective
output impedance of the charge pump is internally
adjusted to prevent large inrush currents and allow for a
wide input voltage range. When the input voltage is lower
than the output voltage, the charge pump operates as a
step-up voltage doubler. When the input voltage is greater
thantheoutput, thechargepumpoperatesasastep-down
gated switch.
The regulator section of the LTC1515, LTC1515-3/5 and
LTC1515-3.3/5 consists of a charge pump, reference,
comparator and some logic. The divided down output
voltage is compared to the internal reference voltage.
When the divided output drops below the reference volt-
age, the charge pump is enabled, which boosts the output
back into regulation. Hysteresis in the comparator forces
theregulatortoburstonandoffandcausesapproximately
100mV of peak-to-peak ripple to appear at the output. By
enabling the charge pump only when needed, the parts
achieve high efficiencies with low output load currents.
5
LTC1515 Series
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W U U
APPLICATIONS INFORMATION
Output Voltage Selection
R
OUT
The LTC1515-X versions have internal resistor networks
which set the output voltage. The 5/3 pin controls an
internal switch that shorts out a portion of the resistor
network to change the output voltage. A logic high on this
pin produces a 5V output and a low produces either a 3V
output or a 3.3V output.
+
+
I
OUT
2V
IN
V
OUT
C
OUT
–
–
LT1515 • F02
Figure 2. Step-Up Mode Equivalent Circuit
40
The output voltage of the LTC1515 is selected using an
external resistor divider (see Figure 1). The output voltage
is determined using the following formula:
30
I
= 20mA
OUT
I
= 50mA
V
OUT = (1.232V)[1 + (R1/R2)]
The total resistance of R1 and R2 should not exceed 2M,
otherwise excess ripple may appear at VOUT
OUT
20
10
0
.
1
2
3
8
7
6
SHDN
POR
V
OUT
3
4
1
5
2
R1
R2
INPUT VOLTAGE (V)
V
IN
+
LT1515 • F03
LTC1515
FB
C1
Figure 3. Step-Up Mode ROUT vs Input Voltage
4
5
–
GND
C1
down mode, ROUT is internally adjusted to ensure that the
maximum output current rating can be met.
LTC1515 • F01
Figure 1. LTC1515 Output Voltage Selection
Capacitor Selection
Maximum VOUT and IOUT Calculations for the LTC1515
For best performance, low ESR capacitors are recom-
mended for both CIN and COUT to reduce noise and ripple.
The CIN and COUT capacitors should be either ceramic or
tantalumandshouldbe10µForgreater.Iftheinputsource
impedance is very low (< 0.5Ω) CIN may not be needed.
Increasing the size of COUT to 22µF or greater will reduce
output voltage ripple—particularly with high VIN voltages
(8V or greater). A ceramic capacitor is recommended for
the flying capacitor C1 with a value of 0.1µF or 0.22µF.
Smaller values may be used in low output current
applications.
The maximum output voltage and current available with
the LTC1515 can be calculated based on the effective
output resistance of the charge pump and the open circuit
output voltage. In step-up mode, the open circuit output
voltageisapproximately2VIN (seeFigure2). Instep-down
mode, the open circuit output voltage equals VIN. The
relationshipbetweenROUT andVIN instep-upmodeisshown
in Figure 3.
The following formulas can be used to find the maximum
outputvoltagethatmaybeprogrammedusingtheLTC1515
for a given minimum input voltage and output current
load.
Output Ripple
NormalLTC1515seriesoperationproducesvoltageripple
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
Step-UpMode:MaxVOUT =(2)(MinVIN)–(IOUT)(ROUT
)
Step-Down Mode: Max VOUT = (Min VIN) – (IOUT)(ROUT
)
When VIN – (IOUT)(ROUT) is less than the programmed
VOUT, the part will automatically switch from step-down
mode to step-up mode. In both step-up mode and step-
6
LTC1515 Series
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APPLICATIONS INFORMATION
ingoutofshutdownmode.WheneverlargeVIN(orboosted
VIN) to VOUT voltage differentials are present, most charge
pumps will pull large current spikes from the input supply.
Only the effective charge pump output impedance limits
the current while the charge pump is enabled. This may
disrupt input supply regulation, especially if the input
supply is a low power DC/DC converter or linear regulator.
The LTC1515 family minimizes inrush currents both at
start-up and under high VIN to VOUT operation.
(equivalent series resistance) in the output capacitor.
Typical output ripple (VIN < 8V) under maximum load is
100mV peak-to-peak with a low ESR, 10µF output capaci-
tor. For applications requiring VIN to exceed 8V, a 22µF or
larger COUT capacitor is recommended to maintain maxi-
mum ripple in the 100mV range.
The magnitude of the ripple voltage depends on several
factors. High input voltages increase the output ripple
since more charge is delivered to COUT per charging cycle.
A large C1 flying capacitor (> 0.22µF) also increases ripple
in step-up mode for the same reason. Large output
current load and/or a small output capacitor (<10µF)
results in higher ripple due to higher output voltage dV/dt.
HighESRcapacitors(ESR>0.5Ω)ontheoutputpincause
high frequency voltage spikes on VOUT with every clock
cycle.
Internal soft start circuitry controls the rate at which VOUT
may be charged from 0V to its final regulated value. The
typical start-up time from VOUT = 0V to 5V is 4ms. This
corresponds to an effective VOUT charging current of only
12.5mA for a 10µF output capacitor (27.5mA for 22µF,
etc.). Note that any output current load present during
start-up will add directly to the charging currents men-
tioned above. The soft start circuitry limits start-up cur-
rent both at initial power-up and when coming out of
shutdown.
There are several ways to reduce the output voltage ripple.
A large COUT capacitor (22µF or greater) will reduce both
the low and high frequency ripple due to the lower COUT
charging and discharging dV/dt and the lower ESR typi-
cally found with higher value (larger case size) capacitors.
A low ESR (<0.5Ω) ceramic output capacitor will mini-
mize the high frequency ripple, but will not reduce the low
frequency ripple unless a high capacitance value is cho-
sen. A reasonable compromise is to use a 10µF to 22µF
tantalum capacitor in parallel with a 1µF to 3.3µF ceramic
capacitor on VOUT to reduce both the low and high
frequency ripple. An RC or LC filter may also be used to
reduce high frequency voltage spikes (see Figure 4).
As the VIN (or boosted VIN) to VOUT voltage differential
grows, theeffectiveoutputimpedanceofthechargepump
is automatically increased by internal voltage sensing
circuitry. This feature minimizes the current spikes pulled
from VIN whenever the charge pump is enabled and helps
to reduce both input and output ripple.
Power-On Reset
The POR pin is an open-drain output that pulls low when
the output voltage is out of regulation. When the VOUT
rises to within 6.5% of regulation, an internal timer is
started which releases POR after 200ms (typ). In shut-
down, the POR output is pulled low. In normal operation,
an external pull-up resistor is generally used between the
LTC1515/
LTC1515-X
8
V
OUT
V
OUT
+
+
1µF
CERAMIC
15µF
TANTALUM
POR pin and VOUT
.
LTC1515/
LTC1515-X
Protection Features
2Ω
8
V
OUT
V
OUT
10µF
TANTALUM
+
10µF
TANTALUM
All of the parts contain thermal shutdown and short-
circuit protection features. The parts will shut down when
the junction temperature reaches approximately 150°C
and will resume operation once the junction temperature
has dropped back to approximately 140°C. The parts will
limit output current to 12mA (typ) when a short circuit
condition (VOUT < 100mV) exists. The parts can survive an
indefinite short to GND.
LT1515 • F04
Figure 4. Output Ripple Reduction Techniques
Inrush Currents
A common problem with switched capacitor regulators is
inrush current—particularly during power-up and com-
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
LTC1515 Series
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TYPICAL APPLICATIONS
Low Power, Low Noise Step-Up/Step-Down 5V Supply with Reset
1.4M
402k
470k
5.5V
1
2
3
8
7
6
SHDN
POR
V
OUT
ON OFF
RESET
V
IN
V
IN
= 3V TO 10V
+
+
LTC1515
+
2Ω
FB
C1
10µF
22µF
0.22µF
5
4
–
GND
C1
+
8
10µF
IN
LT1121-5
OUT
GND
V
I
= 5V
OUT
OUT
1
= 20mA
+
V
< 1mV
RIPPLE
P-P
Programmable 3V/5V GSM SIM Card Power Supply
10µF
3
LTC1515 • TA03
1
2
8
7
V
= 3V OR 5V
= 15mA
OUT
OUT
SHDN
POR
V
OUT
ON OFF
5V 3V
I
V
NC
IN
+
+
LTC1515-3/5
3
4
6
5
Li-Ion
+
–
10µF
10µF
5/3
C1
0.1µF
GND
C1
LTC1515 • TA04
Positive and Negative Supply
V
I
I
= 5V
1
8
OUT
OUT
OUT
SHDN
V
OUT
ON OFF
V
= 15mA, 2.7V ≤ V ≤ 4.4V
IN
2
7
= 50mA, 3.3V ≤ V ≤ 4.4V
IN
POR
LTC1515-3/5
5/3
V
NC
IN
+
+
3
4
6
5
V
= 2.7V TO 4.4V
+
–
IN
10µF
10µF
470Ω
IN
C1
8.2k
0.22µF
0.22µF
GND
C1
Q2
2.4k
Q1
**
* CENTRAL SEMICONDUCTOR
CMPSH-35 DUAL SCHOTTKY
** OPTIONAL CIRCUITRY FOR MAINTAINING
–V WITH LOW V LOADS
*
V
= –1V TO –3.5V
= 5mA
OUT
OUT
OUT OUT
I
Q1, Q2: 2N3904
10µF
LTC1515 • TA05
+
U
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
PACKAGE DESCRIPTION
8-Lead Plastic Small Outline (Narrow 0.150)
0.189 – 0.197*
(4.801 – 5.004)
(LTC DWG # 05-08-1610)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0996
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
RELATED PARTS
PART NUMBER
LTC1514 Series
LTC1516
DESCRIPTION
COMMENTS
Step-Up/Step-Down Switched Capacitor DC/DC Converters
Micropower, Regulated 5V Charge Pump DC/DC Converter
Micropower, Regulated 5V Charge Pump DC/DC Converter
Micropower, Regulated 5V Charge Pump DC/DC Converter
V
IN
2V to 10V, 3.3V and 5V Versions, I
to 50mA
= 50mA (V ≥ 3V)
OUT IN
OUT
I
= 20mA (V ≥ 2V), I
OUT
IN
LTC1517-5
LTC1522
LTC1522 Without Shutdown and Packaged in SOT-23
Available in 8-Pin MSOP, 6µA Quiescent Current, I
= 20mA
OUT
LTC1555/LTC1556 SIM Power Supply and Level Translators
Step-Up/Step-Down SIM Power Supply and Level Translators
5V to –5V Conversion with Low Voltage Loss
LTC660
100mA CMOS Voltage Converter
1515f 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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