SC1631-5CS SEMTECH [Semtech Corporation], SC1631-5CS Datasheet

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SC1631-5CS

Manufacturer Part Number
SC1631-5CS
Description
LOW VOLTAGE STEP-UP DC-DC CONVERTER
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
January 29, 1998
DESCRIPTION
The SC1631 is a high efficiency step up DC-DC
converter. Only four external components are required
to deliver a fixed voltage of 3V, 3.3V, or 5V. Efficiency
beyond 87% can be easily achieved at 100mA load
with 2.2V to 3V input voltages.
A logic-controlled shutdown mode is provided for
power saving. Switch current limit can be programmed
with a resistor. The low battery detector can be
configured as a linear regulator or a burst mode
controller providing extremely low supply current
operation.
A switching rate of 120kHz reduces the inductor size -
inductors of 25µH to 50µH are recommended for most
applications.
BLOCK DIAGRAM
PIN CONFIGURATION
© 1997 SEMTECH CORP.
LOW VOLTAGE STEP-UP
DC-DC CONVERTER
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
APPLICATIONS
FEATURES
ORDERING INFORMATION
Note:
(1) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Operating
Temperature Range
Storage Temperature
Range
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1631-3CS
SC1631-5CS
SC1631CS
DEVICE
Palmtop and notebook computers
Pocket organizers
Cameras
Pagers
Battery backup supplies
Portable instruments
High efficiency 90%
Power-saving shutdown mode (7µA typical)
Internal 2A switch
120kHz switching rate
Adjustable switch current limit
On-chip low battery detector
(1)
OUTPUT VOLTAGE
Symbol Maximum
T
V
T
3.3V
3.0V
5.0V
STG
IN
A
-65 to 125
0 to 70
7.0
PACKAGE
SC1631
SO-8
Units
°C
°C
V

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SC1631-5CS Summary of contents

Page 1

... Pocket organizers Cameras Pagers Battery backup supplies Portable instruments ORDERING INFORMATION (1) DEVICE SC1631CS SC1631-3CS SC1631-5CS Note: (1) Add suffix ‘TR’ for tape and reel. ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Operating Temperature Range Storage Temperature Range 652 MITCHELL ROAD NEWBURY PARK CA 91320 ...

Page 2

... Shutdown Mode Current Recovery Time from Shutdown Efficiency SC1631/SC1631-3 SC1631-5 Line Regulation SC1631 SC1631-3 SC1631-5 Load Regulation SC1631/SC1631-3 SC1631-5 Oscillator Frequency LBI Pin Trip Point LBO “On Resistance” SW “On Resistance” SC1631/SC1631-3 SC1631-5 SW Off Leakage Input Pin Bias Current Output Pin Leakage © ...

Page 3

... January 29, 1998 TYPICAL PERFORMANCE CHARACTERISTICS © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1631 ...

Page 4

... January 29, 1998 TYPICAL PERFORMANCE CHARACTERISTICS (cont.) TYPICAL APPLICATION CIRCUIT © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1631 ...

Page 5

... January 29, 1998 APPLICATION EXAMPLES Figure 3. 1-Cell Input 3V Output Step-Up Converter © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER Figure 1. 3V Output Step-Up Converter Figure 2. 5V Output Step-Up Converter 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1631 ...

Page 6

... January 29, 1998 APPLICATION EXAMPLES (cont.) Figure 4. 1-Cell Input 5V Output Step-Up Converter Figure 5. 4-Cell Input Step-Up/Step-Down Converter Figure 6. Low Supply Current Burst Mode Step-Up Converter © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1631 ...

Page 7

... It serves to protect the IC and inductor, as well as to improve efficiency and output ripple. However, the supply ca- pability of the SC1631 is limited by the current limit resistor (see typical per- formance characteristics). The I pin should be shorted to V switch peak current is not required. ...

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