ltc1757a-2 Linear Technology Corporation, ltc1757a-2 Datasheet - Page 16

• Manufacturer Part Number: ltc1757a-2
• Description: Single/dual Band Rf Power Controllers
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIO
LTC1757A-1/LTC1757A-2
RELATED PARTS
16
PART NUMBER
LTC1261
LTC1550/LTC1551
LTC1555L-1.8
LTC1682
LTC1731
LTC3200/LTC3200-5
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
Li-Ion
V
Using the LTC1757A-1 in a Dual Band Cellular Telephone Transmitter Without Current Limiting
IN
68
DESCRIPTION
Regulated Inductorless Voltage Inverter
Low Noise Inductorless Voltage Inverter
SIM Card Power Supply and
Level Translator
Doubler Charge Pump with Low Noise
Linear Regulator
Li-Ion Linear Battery Charger
Low Noise, Regulated Charge Pump
SHDN
68
V
IN
Li-Ion
33pF
33pF
1
2
3
4
SHDN
V
RF
SHDN
GND
IN
LTC1757A-1
U
1
2
3
4
DAC
V
RF
SHDN
GND
TXEN
PCTL
IN
V
V
LTC1757A-1
PCA
Single Band Cellular Telephone Transmitter
CC
DAC
8
7
6
5
TXEN
PCTL
V
V
PCA
TXEN
CC
8
7
6
5
TXEN
COMMENTS
Regulated –5V from 3V, REG Pin Indicates Regulation, Up to 15mA, Micropower
Regulated Output, <1mV
Buck/Boost Charge Pump Generates 1.8V, 3V or 5V; 30 A Quiescent Current;
2.6V V
1.8V V
Ideal for backlighting
Small, Thin 8-Pin MSOP, Trickle Charge, EOC Indicator, 1% Accuracy
2MHz Constant Frequency, I
SOT-23 and MSOP Packages
RF POWER MODULE WITH MUX
IN
IN
RF
IN
V
PWRCTRL
BANDSELECT
CC
6V
4.4V; Low Noise 60 V
900MHz
RF1 IN
RF PA
1800MHz
1800MHz
RF2 IN
RFOUT1
900MHz
RFOUT2
P-P
OUT
Ripple, 900kHz
= 100mA, 2.7V V
RMS
DIRECTIONAL
DIRECTIONAL
COUPLER
(100kHz BW);
COUPLER
1757af LT/TP 1000 4K • PRINTED IN THE USA
LINEAR TECHNOLOGY CORPORATION 2000
1757A TA02
IN
50
50
DIPLEXER
4.5V,
1757A TA03