LTC1700EMS

Series: -
Boost: Yes
Inverting: No
Doubler: No
Divider: No
Cuk: No
Isolated: No
Buck: No
PWM Type: Current Mode
Number of Outputs: 1
Operating Temperature: -40°C ~ 85°C
Packaging: Tube
Flyback: No
Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Manufacturer: Linear Technology
Duty Cycle: 92%
Frequency - Max: 680kHz
Voltage - Supply: 0.9 V ~ 6 V


Features:

High Efficiency: Up to 95%
No Current Sense Resistor Required
Constant Frequency 530kHz Operation Allows
  Small Size, Surface Mount Inductors
OPTI-LOOP^TM Compensation Minimizes C_OUT
Selectable Burst Mode^TM Operation
Minimum Start-Up Voltage as low as 0.9V
Synchronizable Between 400kHz and 750kHz
Micropower Shutdown: 10µA
Current Mode Operation for Excellent Line and Load
  Transient Response
Soft-Start Reduces Supply Current Transients
1.5% Output Voltage Accuracy
Uses Low Value, Small Size, Surface Mount Inductors
Available in 10-Lead MSOP Package

Application

Cellular Telephones
Wireless Modems
RF Communications
2.5V to 3.3V, 2.5V to 5V Converters
Battery-Powered Equipment
Telecom/Network Systems


Pinout




Specifications

Output Supply Voltage (V_OUT)......................0.3V to 6V
RUN/SS, VFB Voltages...............................0.3V to 2.4V
SYNC/MODE, ITH Voltages............................0.3V to 6V
SWITCH Voltage (SW)...............................0.3V to 6.5V
TG, BG Peak Output Current (<10µs).........................1A
Operating Temperature Range (Note 2)..40°C to 85°C
Junction Temperature (Note 3).............................125°C
Storage Temperature Range.................65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C


Description

The LTC_^®1700 is a current mode synchronous step-up DC/DC controller that drives external N-channel and P-channel power MOSFETs using a constant frequency PWM architecture. Current limiting is provided by sensing the voltage drop across the main MOSFET, eliminating the need of a sense resistor. This No R_SENSE^TM technique helps the LTC1700 maintain high efficiency at heavy loads while Burst Mode operation ensures high efficiency at light loads, thus providing high efficiencies over a wide range of loadcurrents.

The LTC1700 operates at a minimum input voltage as low as0.9V. The device boasts a ±1.5% output voltage accuracy andconsumes only 200µA of quiescent current. In shutdown, itonly draws 10µA.

To prevent inductor current runaway, the duty cycle is limited to 90%. Overvoltage protection is also provided which shuts both the external MOSFETs off when tripped. High constant operating frequency of 530kHz allows the use of small inductors and output capacitors. The LTC1700 can also be synchronized between 400kHz to 750kHz. Burst Mode operation is inhibited when the device is externally clocked or when the SYNC/MODE pin is pulled low to reduce noise and RF interference.

Parameters:

Technical/Catalog Information	LTC1700EMS
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Up (Boost)
Number of Outputs	1
Voltage - Input	0.9 ~ 6 V
Voltage - Output	-
Current - Output	1A
Power - Output	-
Package / Case	10-MSOP, Micro10?, 10-uMAX, 10-uSOP
Packaging	Bulk
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	-40°C ~ 85°C
Frequency - Switching	530kHz
Drawing Number	161; 05-08-1661; MS, MS10; 10
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1700EMS LTC1700EMS