LTC1928ES6-5 Linear Technology, LTC1928ES6-5 Datasheet

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LTC1928ES6-5

Manufacturer Part Number
LTC1928ES6-5
Description
Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT
Manufacturer
Linear Technology
Datasheet

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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

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LTC1928ES6-5 Summary of contents

Page 1

... 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. , LTC and LT are registered trademarks of Linear Technology Corporation ThinSOT is a trademark of Linear Technology Corporation ...

Page 2

... Burst Mode is a trademark of Linear Technology Corporation. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1928ES6-5 is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...

Page 3

ELECTRICAL CHARACTERISTICS Note 4: Operating conditions are limited by maximum junction temperature. The regulated output specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range may ...

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 ...

Page 5

PIN FUNCTIONS V (Pin 1): Input Voltage, 2.7V to 4.4V bypassed with low ESR capacitor as close to the pin as possible for best performance. A minimum capaci- tance value of 0.1 ...

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 ...

Page 7

... 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

... Low Noise PWM Operation 60 V Noise 80mA, MSOP RMS OUT 50mA, Shutdown Q OUT Noise, 300mV Dropout Q RMS Low Noise, 5V Output or Adjustable 1928f LT/TP 0601 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2000 .25 – .50 (.010 – .020) (6PLCS, NOTE 2) S6 SOT-23 0401 ...

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