sc1633cs Semtech Corporation, sc1633cs Datasheet

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sc1633cs

Manufacturer Part Number
sc1633cs
Description
Voltage Step-up Dc-dc Converter
Manufacturer
Semtech Corporation
Datasheet
January 29, 1998
DESCRIPTION
The SC1633 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 83% can be easily achieved at 70mA 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 47µH to 150µH inductance 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
ORDERING INFORMATION
SC1633CS
SC1633-3CS
SC1633-5CS
Note:
(1) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Operating
Temperature Range
Storage
Temperature Range
FEATURES
TYPICAL APPLICATION CIRCUIT
652 MITCHELL ROAD NEWBURY PARK CA 91320
DEVICE
Pocket organizers
Electronic dictionaries
Cameras
Pagers
Bar code scanners
LCD displays
Battery backup supplies
Portable instruments
High efficiency 87%
Power-saving shutdown mode (7µA typical)
Internal 0.8A switch
120kHz switching rate
Adjustable switch current limit
On-chip low battery detector
(1)
VOLTAGE
Symbol
3.3V
3.0V
5.0V
T
V
T
STG
IN
A
Maximum
-65 to 125
0 to 70
7.0
PACKAGE
SC1633
SO-8
Units
°C
°C
V

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sc1633cs Summary of contents

Page 1

... Pocket organizers Electronic dictionaries Cameras Pagers Bar code scanners LCD displays Battery backup supplies Portable instruments ORDERING INFORMATION (1) DEVICE SC1633CS SC1633-3CS SC1633-5CS Note: (1) Add suffix ‘TR’ for tape and reel. ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Operating Temperature Range Storage ...

Page 2

January 29, 1998 ELECTRICAL CHARACTERISTICS Unless otherwise specified 25° Parameter Input Voltage Output Voltage SC1633 SC1633-3 SC1633-5 Switch Off Current No Load Current SC1633/SC1633-3 SC1633-5 Shutdown Mode Current Shutdown Recovery Time Efficiency SC1633/SC1633-3 SC1633-5 Line Regulation ...

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 SC1633 ...

Page 4

January 29, 1998 TYPICAL PERFORMANCE CHARACTERISTICS (cont.) APPLICATION EXAMPLES © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER Figure 1. 3V Output Step-Up Converter 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1633 ...

Page 5

January 29, 1998 APPLICATION EXAMPLES (cont.) Figure 3. 1-Cell Input 3V Output Step-Up Converter Figure 4. 4-Cell Input Step-Up/Step-Down Converter © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER Figure 2. 5V Output Step-Up Converter 652 MITCHELL ROAD NEWBURY PARK ...

Page 6

January 29, 1998 APPLICATION EXAMPLES (cont.) Figure 5. 3-Cell Input 3V Output Step-Down Converter Figure 6. Boost-Drive 5V Output Step-Down Converter © 1997 SEMTECH CORP. LOW VOLTAGE STEP-UP DC-DC CONVERTER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1633 ...

Page 7

January 29, 1998 DEVICE OUTLINE - SO-8 PIN DESCRIPTIONS PIN 1: I /SD (1) Connected to V LIM resistor to set the switch peak current. It serves to protect the IC and induc- tor, as well as to improve efficiency ...

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