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LTC1550LCMS8-2.5#TRPBF

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1
LTC1550L/LTC1551L
Low Noise, Switched
Capacitor Regulated
Voltage Inverters
The LTC
®
1550L/LTC1551L are switched capacitor charge
pump voltage inverters which include internal linear post-
regulators to minimize output ripple. The LTC1550L fixed
output voltage versions include –4.1V, –2.5V and –2V with
ripple voltages typically below 1mV
P-P
. The LTC1550L is
also available in an adjustable output voltage version. The
LTC1550L/LTC1551L are ideal for use as bias voltage
generators for GaAs transmitter FETs in portable RF and
cellular telephone applications.
The LTC1550L/LTC1551L operate from single 2.7V to
5.5V supplies and draw typical quiescent currents of
3.5mA with a 5V supply. Each device includes a TTL
compatible Shutdown pin which drops supply current to
0.2µA typically. The LTC1550L Shutdown pin is active low
(SHDN), while the LTC1551L Shutdown pin is active high
(SHDN). Only four external components are required: an
input bypass capacitor, two 0.1µF charge pump capacitors
and a filter capacitor at the linear regulator output. The
adjustable LTC1550L/LTC1551L require two additional re-
sistors to set the output voltage. The LTC1550L/LTC1551L
will supply up to 20mA (depending on V
CC
to V
OUT
range),
while maintaining guaranteed output regulation of ±2.5%.
Both fixed voltage and adjustable LTC1550L/LTC1551L
are available in 8-lead MSOP and SO plastic packages: the
adjustable LTC1550L is also available in a 16-pin SSOP
with the REG pin.
, LTC and LT are registered trademarks of Linear Technology Corporation.
5µs/DIV 1550L/51L TA01a
■
Regulated Negative Voltage from a Single
Positive Supply
■
Low Output Ripple: Less Than 1mV
P-P
Typ
■
High Charge Pump Frequency: 900kHz
■
Small Charge Pump Capacitors: 0.1µF
■
Requires Only Four External Capacitors
■
Fixed –4.1V, –2.5V, –2V or Adjustable Output
■
Shutdown Mode Drops Supply Current to <1µA
■
High Output Current: Up to 20mA (Depending on
V
CC
to V
OUT
Range)
■
Output Regulation: 2.5% Over Line, Load and
Temperature
■
Available in 8-Lead MSOP, 8-Lead Narrow SO and
16-Lead Narrow SSOP
■
GaAs FET Bias Generators
■
Negative Supply Generators
■
Battery-Powered Systems
■
Single Supply Applications
V
OUT
AC COUPLED
2mV/DIV
V
OUT
Output Noise and Ripple
Figure 1. –2V Generator with 1mV
P-P
Noise
1
2
3.6V
8
7
REG
CP
OUT
SHDN
V
CC
C1
+
V
OUT
LTC1550L-2
GND
C1
–
C
OUT
10µF
1550L/51L TA01
V
OUT
= –2V
I
LOAD
= 5mA
C
CP
0.1µF
R1
10k
POWER VALID
C1
0.1µF
2.2µF
C
IN
3
4
6
5
C
L
0.1µF
+
+
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
2
LTC1550L/LTC1551L
ABSOLUTE MAXIMUM RATINGS
W
WW
U
(Note 1)
Supply Voltage ...................................................... 5.5V
Output Voltage............................. 0.3V to (V
CC
– 10.5V)
Total Voltage, V
CC
to CP
OUT
..........................................
10.8V
Input Voltage (SHDN Pin) ........... –0.3V to (V
CC
+ 0.3V)
Input Voltage (REG Pin) ............................. – 0.3V to 6V
Output Short-Circuit Duration.............................. 30 sec
Commercial Temperature Range .................0°C to 70°C
Extended Commercial Operating
Temperature Range (Note 3) .............. –40°C to 85°C
Industrial Temperature Range ................ –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART NUMBER
LTC1550LCGN
LTC1550LIGN
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
C1
+
NC
V
OUT
C1
–
PGND
AGND
NC
V
CC
SHDN
REG
NC
ADJ
CP
OUT
NC
NC
T
JMAX
= 150°C, θ
JA
= 150°C/W
GN PART MARKING
T
JMAX
= 150°C, θ
JA
= 200°C/W
*SHDN FOR LTC1550L, SHDN FOR LTC1551L
*FOR ADJUSTABLE VERSION
ORDER PART NUMBER
MS8 PART MARKING
LTC1550LCMS8
LTC1550LCMS8-2
LTC1550LCMS8-2.5
LTC1550LCMS8-4.1
LTC1551LCMS8
LTC1551LCMS8-4.1
LTFQ
LTFT
LTEG
LTGR
LTFV
LTEH
T
JMAX
= 150°C, θ
JA
= 135°C/W
*SHDN FOR LTC1550L, SHDN FOR LTC1551L
*FOR ADJUSTABLE VERSION
1
2
3
4
8
7
6
5
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
REG (ADJ*)
CP
OUT
GND
C1
–
SHDN*
V
CC
C1
+
V
OUT
1
2
3
4
8
7
6
5
TOP VIEW
REG (ADJ*)
CP
OUT
GND
C1
–
SHDN*
V
CC
C1
+
V
OUT
S8 PACKAGE
8-LEAD PLASTIC SO
ORDER PART NUMBER
LTC1550LCS8
LTC1550LCS8-2
LTC1550LCS8-2.5
LTC1550LCS8-4.1
LTC1551LCS8
LTC1551LCS8-4.1
Consult factory for Military grade parts and additional voltage options.
1550L
1550LI
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage
(Adjustable, Fixed –2V)
● 2.7 5.25 V
(Fixed –2.5V)
● 3.05 5.25 V
(Fixed –4.1V) ● 4.5 5.25 V
V
REF
Reference Voltage V
CC
= 5V, ADJ = GND, V
REF
= –V
OUT
1.225 V
∆V
REF
Reference Voltage I
OUT
= 0mA, 2.7V ≤ V
CC
≤ 5.25V 2.5 mV/V
∆(V
CC
– V
OUT)
Line Regulation
I
S
Supply Current V
CC
= 5V, V
SHDN
= V
CC
(LTC1550L) or GND (LTC1551L) ● 3.65 7 mA
V
CC
= 5V, V
SHDN
= GND (LTC1550L) or V
CC
(LTC1551L) ● 0.2 10 µA
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 2.7V to 5.25V, C1 = C
CP
= 0.1µF, C
OUT
= 10µF, T
A
= 25°C unless otherwise specified. (Note 3)
ELECTRICAL CHARACTERISTICS
3
LTC1550L/LTC1551L
f
OSC
Internal Oscillator Frequency 900 kHz
V
OL
REG Output Low Voltage I
REG
= 1mA, V
CC
= 5V ● 0.1 0.8 V
I
REG
REG Sink Current V
REG
= 0.8V, V
CC
= 5V ● 410 mA
V
IH
SHDN Input High Voltage V
CC
= 5V ● 2V
V
IL
SHDN Input Low Voltage V
CC
= 5V ● 0.8 V
I
IN
SHDN Input Current V
SHDN
= V
CC
(All LTC1550L Versions) ● 0.1 1 µA
V
SHDN
= V
CC
(All LTC1551L Versions) ● 520 µA
t
ON
Turn-On Time V
CC
= 5V, I
OUT
= 10mA, –1.5V ≤ V
OUT
≤ 4.1V ● 15ms
(LTC1550L/LTC1551L)
V
CC
= 5V, I
OUT
= 5mA, V
OUT
= –4.5V ● 15ms
(LTC1550L/LTC1551L)
V
CC
= 5V, I
OUT
= 10mA, V
OUT
= –2V ● 15ms
(LTC1550L-2)
V
CC
= 5V, I
OUT
= 10mA, V
OUT
= –2.5V ● 15ms
(LTC1550L-2.5)
V
CC
= 5V, I
OUT
= 10mA, V
OUT
= –4.1V ● 15ms
(LTC1550L-4.1/LTC1551L-4.1)
V
OUT
Output Regulation 2.7V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –1.537 –1.5 –1.463 V
(LTC1550L/LTC1551L) 2.8V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –1.537 –1.5 –1.463 V
3.5V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 20mA ● –1.537 –1.5 –1.463 V
V
OUT
Output Regulation 2.7V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –2.05 –2.0 –1.95 V
(LTC1550L/LTC1550L-2/ 3.1V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –2.05 –2.0 –1.95 V
LTC1551L) 3.75V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 20mA ● –2.05 –2.0 –1.95 V
V
OUT
Output Regulation 3.05V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –2.562 –2.5 –2.438 V
(LTC1550L/LTC1550L-2.5/ 3.45V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –2.562 –2.5 –2.438 V
LTC1551L) 4.1V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 20mA ● –2.562 –2.5 –2.438 V
V
OUT
Output Regulation 3.45V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –3.075 –3.0 –2.925 V
(LTC1550L/LTC1551L) 3.85V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –3.075 –3.0 –2.925 V
4.5V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 20mA ● –3.075 –3.0 –2.925 V
V
OUT
Output Regulation 3.9V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –3.587 –3.5 –3.413 V
(LTC1550L/LTC1551L) 4.2V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –3.587 –3.5 –3.413 V
4.85V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 20mA ● –3.587 –3.5 –3.413 V
V
OUT
Output Regulation 4.5V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –4.203 –4.1 –3.998 V
(LTC1550L/LTC1550L-4.1) 4.75V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –4.203 –4.1 –3.998 V
(LTC1551L/LTC1551L-4.1)
V
OUT
Output Regulation 4.8V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 5mA ● –4.613 –4.5 –4.388 V
(LTC1550L/LTC1551L)) 5.1V ≤ V
CC
≤ 5.25V, 0 ≤ I
OUT
≤ 10mA ● –4.613 –4.5 –4.388 V
I
SC
Output Short-Circuit Current V
OUT
= 0V, V
CC
= 5.25V ● 80 200 mA
V
RIPPLE
Output Ripple Voltage 1mV
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 2.7V to 5.25V, C1 = C
CP
= 0.1µF, C
OUT
= 10µF, T
A
= 25°C unless otherwise specified. (Note 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified. All typicals are given at T
A
= 25°C.
Note 3: The LTC1550LC/LTC1551LC are guaranteed to meet specified
performance from 0°C to 70°C and are designed, characterized and
expected to meet these extended temperature limits, but are not tested at
–40°C and 85°C. The LTC1550LI is guaranteed to meet the extended
temperature limits.
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LTC1550LCMS8-2.5#TRPBF

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Buy LTC1550LCMS8-2.5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators L N, Switched Cap Reg V Inv
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