LTC1550CGN Linear Technology, LTC1550CGN Datasheet

IC VOLT INV REGLTD SW-CAP 16SSOP

LTC1550CGN

Manufacturer Part Number
LTC1550CGN
Description
IC VOLT INV REGLTD SW-CAP 16SSOP
Manufacturer
Linear Technology
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet

Specifications of LTC1550CGN

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
Adjustable
Current - Output
20mA
Frequency - Switching
900kHz
Voltage - Input
4.5 ~ 6.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
16-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

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Company
Part Number
Manufacturer
Quantity
Price
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464
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FEATURES
APPLICATIONS
TYPICAL
+
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
CC
Regulated Negative Voltage from a Single
Positive Supply
Low Output Ripple: Less Than 1mV
High Charge Pump Frequency: 900kHz Typ
Small Charge Pump Capacitors: 0.1 F
Requires Only Four External Capacitors
Fixed – 4.1V or Adjustable Output
Shutdown Mode Drops Supply Current to < 1 A
High Output Current: Up to 10mA, V
Output Regulation: 5%
Available in SO-8 and 16-Lead SSOP
GaAs FET Bias Generators
Negative Supply Generators
Battery-Powered Systems
Single Supply Applications
4.7 F
C
IN
1
2
3
4
– 4.1V Generator with 1mV
SHDN
V
C1
V
CC
OUT
APPLICATION
+
LTC1551
0.1 F
C1
U
SENSE
CP
GND
OUT
C1
6
5
8
7
+
FERRITE BEAD
U
C
10 F
OUT
P-P
Noise
CC
P-P
= 5V
Typ
C
0.1 F
C
0.1 F
L
CP
V
I
LOAD
OUT
= –4.1V
= 5mA
1550/51 F01
DESCRIPTION
The LTC
pump voltage inverters which include internal linear post-
regulators to minimize output ripple. Output voltages are
fixed at – 4.1V, with ripple voltages typically below 1mV
The LTC1550 is also available in an adjustable output
voltage version. The LTC1550/LTC1551 are ideal for use
as bias voltage generators for GaAs transmitter FETs in
portable RF and cellular telephone applications.
The LTC1550/LTC1551 operate from single 4.5V to 6.5V
supplies and draw typical quiescent currents of 4.25mA
with a 5V supply. Each device includes a TTL compatible
Shutdown pin which drops supply current to 0.2 A typi-
cally. The LTC1550 Shutdown pin is active low (SHDN),
while the LTC1551 Shutdown pin is active high (SHDN).
Only four external components are required: an input bypass
capacitor, two 0.1 F charge pump capacitors and a filter
capacitor at the linear regulator output. The adjustable LTC1550
requires two additional resistors to set the output voltage. The
LTC1550/LTC1551 will supply up to 10mA output current
with a 5V supply, while maintaining guaranteed output
regulation of 5%.
The fixed voltage LTC1550/LTC1551 are available in S0-8
plastic packages. The adjustable LTC1550 is available in a
16-pin SSOP.
AC COUPLED
2mV/DIV
®
V
OUT
1550/LTC1551 are switched capacitor charge
Capacitor Regulated
Low Noise, Switched
V
OUT
U
Output Noise and Ripple
Voltage Inverters
LTC1550/LTC1551
10 s/DIV
1550/51 TA02
1
P-P
.

Related parts for LTC1550CGN

LTC1550CGN Summary of contents

Page 1

... High Output Current 10mA, V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP U APPLICATIONS GaAs FET Bias Generators Negative Supply Generators Battery-Powered Systems Single Supply Applications , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATION – 4.1V Generator with 1mV SHDN SENSE ...

Page 2

... V 6.5V 20mA CC OUT 2.7V V 6.5V 5mA CC OUT 3.1V V 6.5V 10mA CC OUT 3.75V V 6.5V 20mA CC OUT ORDER PART NUMBER SHDN 14 LTC1550CGN REG 13 SENSE LTC1550IGN 12 ADJ 11 CP OUT PART MARKING 9 NC 1550 = 150 MIN TYP MAX 2.7 6.5 4.5 6.5 1.24 4.25 7 (LTC1551) 0 ...

Page 3

... Output Regulation OUT (LTC1550CGN/LTC1550IGN) V Output Regulation OUT (LTC1550CGN/LTC1550IGN) V Output Regulation OUT (LTC1550CGN/LTC1550IGN) V Output Regulation OUT (LTC1550CGN/LTC1550IGN) V Output Regulation OUT (LTC1550CS8-4.1/LTC1551CS8-4.1) I Output Short-Circuit Current SC V Output Ripple Voltage RIPPLE The denotes specifications which apply over the specified temperature range. 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 ...

Page 4

LTC1550/LTC1551 W U TYPICAL PERFORMANCE CHARACTERISTICS Maximum Output Current vs Supply Voltage 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 SUPPLY VOLTAGE (V) ...

Page 5

... CC CC 4.5V and 6.5V for the fixed voltage LTC1550CS8-4.1/ LTC1551CS8-4.1. The adjustable voltage LTC1550CGN/ LTC1550IGN operates with a VCC range of 2.7V to 6.5V. Output voltage and output load current conditions depend on the VCC supply voltage. Consult the Electrical Charac- teristics table and Typical Performance Characteristics for guaranteed test points ...

Page 6

... The LTC1550CS8/LTC1551CS8 provide a regulated, low ripple – 4.1V output 10mA load current from a single 5V supply. The LTC1550CGN provides a regulated, low ripple adjustable output. Output load current for the adjustable version depends on the input/output voltage combination. ...

Page 7

... W U Adjustable Hook- OUT The LTC1550CGN is available in an adjustable output version in a 16-pin SSOP package. The output voltage is set with a resistor divider from GND to SENSE/V (Figure 1). Note that the internal reference and the internal feedback amplifier are set positive-output regula- tor referenced to the SENSE pin, not a negative regulator referenced to ground ...

Page 8

LTC1550/LTC1551 U U APPLICATIONS INFORMATION output capacitors provide lower output ripple. To keep ripple below 1mV , greater, with a 0.1 F ceramic P-P capacitor in parallel, is required. At least 4 required at the ...

Page 9

U U APPLICATIONS INFORMATION noise – 4.1V generator which uses a ferrite bead output filter to achieve better than 1mV ripple. The corresponding spectrum and spot noise plots for this circuit are shown in the Typical Performance Characteristics section. Output ...

Page 10

LTC1550/LTC1551 PACKAGE DESCRIPTION 0.0075 – 0.0098 (0.191 – 0.249) 0.016 – 0.050 (0.406 – 1.270) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... CP OUT C CP LTC1550 0 GND 5 – C1 FERRITE BEAD C OUT 0.1 F COMMENTS 100mA Switched-Capacitor Converter Selectable Fixed Output Voltages Synchronizable Up to 2MHz System Clock – 4. GaAs 0.1 F TRANSMITTER 1550/51 TA03 15501fa LT/TP 0897 REV A 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996 ...

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