LTC1928-5 LINER [Linear Technology], LTC1928-5 Datasheet

no-image

LTC1928-5

Manufacturer Part Number
LTC1928-5
Description
Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
TYPICAL
APPLICATIO S
2.7V TO 4.4V
Low Output Noise: 90 V
Fixed Output Voltage: 5V
Input Voltage Range: 2.7V to 4.4V
No Inductors Required
Uses Small Ceramic Capacitors
Output Current Up to 30mA
550kHz Switching Frequency
Low Operating Current: 190 A
Low Shutdown Current: 4 A
Internal Thermal Shutdown and Current Limiting
Low Profile (1mm) ThinSOT
VCO Power Supplies for Cellular Phones
2-Way Pagers
Wireless PCMCIA Cards
Portable Medical Instruments
Low Power Data Acquisition
Remote Transmitters
White LED Drivers
GaAs Switches
V
IN
Figure 1. Low Noise 5V Power Supply
4.7 F
APPLICATION
0.47 F
U
1
5
6
V
CP
CN/SHDN
IN
LTC1928-5
RMS
TM
(100kHz BW)
V
GND
CPO
OUT
U
Package
3
4
2
4.7 F
5V
19285 F01
4.7 F
V
OUT
Doubler Charge Pump with
Low Noise Linear Regulator
DESCRIPTIO
The LTC
low noise, low dropout (LDO) linear regulator. The part is
designed to provide a low noise boosted supply voltage for
powering noise sensitive devices such as high frequency
VCOs in wireless applications.
An internal charge pump converts a 2.7V to 4.4V input to
a boosted output, while the internal LDO regulator con-
verts the boosted voltage to a low noise regulated output.
The regulator is capable of supplying up to 30mA of output
current. Shutdown reduces the supply current to < 8 A,
removes the load from V
discharges V
The LTC1928-5 LDO regulator is stable with only 2 F on
the output. Small ceramic capacitors can be used, reduc-
ing PC board area.
The LTC1928-5 is short-circuit and overtemperature pro-
tected. The part is available in a 6-pin low profile
(1mm)ThinSOT package.
ThinSOT is a trademark of Linear Technology Corporation.
200 V/DIV
, LTC and LT are registered trademarks of Linear Technology Corporation
V
OUT
®
1928-5 is a doubler charge pump with an internal
C
I
V
V
T
OUT
CPO
IN
OUT
A
Output Noise (BW = 10Hz to 2.5MHz)
= 25 C
OUT
= 3V
= 10mA
= C
= 5V
OUT
to ground through a 200 switch.
= 4.7 F 100 s/DIV
U
IN
by disabling the regulator and
in ThinSOT
LTC1928-5
19285 TA01
1

Related parts for LTC1928-5

LTC1928-5 Summary of contents

Page 1

... The regulator is capable of supplying up to 30mA of output current. Shutdown reduces the supply current to < removes the load from V discharges V The LTC1928-5 LDO regulator is stable with only the output. Small ceramic capacitors can be used, reduc- ing PC board area. The LTC1928-5 is short-circuit and overtemperature pro- tected ...

Page 2

... LTC1928 ABSOLUTE AXI U RATI GS (Note Ground ..............................................– 0. Voltage ...........................................– 0.3V to 5.25V OUT CPO to Ground ........................................................ 10V CN/SHDN to Ground ..................... – 0. Short-Circuit Duration ............................. Indefinite OUT I OUT ......................................................................................... Operating Temperature Range (Note 2) ...– Maximum Junction Temperature ......................... 125 C Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec) ...

Page 3

... G02 Enable to Shutdown Timing (Figure LOAD OUT C = 4.7 F OUT 0 1ms/DIV 19285 G05 LTC1928-5 . There may until the shutdown state IN SOURCE V Transient Response OUT – OUT C = 4.7 F –10 ...

Page 4

... LTC1928 TYPICAL PERFOR A CE CHARACTERISTICS Operating Current (No Load) 260 240 220 200 180 160 140 120 100 2.5 3.0 3.5 4.0 4.5 V (V) IN 19285 G07 W BLOCK DIAGRA 4.7 F POR/ SHDN CONTROL 4 Efficiency vs Supply Voltage 100 15mA OUT ...

Page 5

... The V voltage is internally set to 5V APPLICATIONS INFORMATION Operation The LTC1928-5 uses a switched-capacitor charge pump to generate a CPO voltage of approximately 2V powers an internal low dropout linear regulator that sup- plies a regulated output Internal comparators are OUT used to sense CPO and V ...

Page 6

... LTC1928 APPLICATIONS INFORMATION DROPOUT CPO CPO + V DROPOUT + 2V C – IN CPO Figure 2. Equivalent Circuit External CPO Loading The CPO output can drive an external load (for example, an LDO). The current required by this additional load will reduce the available current from V OUT requires 1mA, the available current 1mA ...

Page 7

... C 4.7 F Figure 4. LTC1928-5, External Load on CPO, No Shutdown State 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 8

... LTC1754-5 Micropower 5V Charge Pump in ThinSOT LT1761 Series 100mA ThinSOT, Low Noise LDO Regulators LTC3200 Constant Frequency Doubler Charge Pump Linear Technology Corporation 8 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com W U LTC1928 RIPPLE OUT ...

Related keywords