B3800M Bay Linear, Inc., B3800M Datasheet

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B3800M

Manufacturer Part Number
B3800M
Description
5.5mA 1MHz switching regulator controller step up low voltage (BIPOLAR)
Manufacturer
Bay Linear, Inc.
Datasheet
1.B3800M.pdf (10 pages)
Pin Connection
Description
The Bay Linear B3800 series is monolithic control circuit
containing the primary functions required for DC-to-DC
converters. This device is design for low voltage applications
incorporating a soft start function and sort circuit detection
function. The device has a low minimum operating voltage of
1.8V and is ideal for the power supply of battery-operated
electronic equipments.
This series was specially designed to be incorporated in Step-
Down and voltage-inverting applications with a minimum
number of external components.
The B3800 is offer in 8-pin DIP or Surface mount package.
Bay Linear, Inc
Bay Linear
Inspire the Linear Power
BR/CTL
BR/CTL
-IN
-IN
SCP
SCP
Vcc
Vcc
8-Pin Surface Mount
8-
8-Pin Surface Mount
8-
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
Top View
Top View
Step Up Low Voltage (BIPOLAR)
Switching Regulator Controller
8
8
8
8
7
7
7
7
6
6
6
6
5
5
5
5
FB
FB
OSC
OSC
GND
GND
OUT
OUT
Features
Applications
Ordering Information
B3800M
•
•
•
•
•
•
•
•
•
•
•
•
•
8-pin
SO-8
Wide operation from…………... 1.8 to 15V
Low Standby Current……………….. 1 µA
Low Current Consumption……… 5.5mA
high Speed Operation ……………. 1MHz
Incorporates soft start circuit
Incorporates a stand-by function
Incorporate a times-latch short circuit
detection circuit (SCP)
Totem-pole type output with adjustable
on/off current (for NPN transistor)
The error amplifier gain is set inside the
IC, so peripheral components are
minimized.
Direct Replacement for MB3800
Digital Camera
MP3
Low Battery Operating Applications
B3800P
P-DIP
8-pin
Temp. Range
www.baylinear.com
-40°C to 85°C
Operating
B3800

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B3800M Summary of contents

Page 1

... The error amplifier gain is set inside the IC, so peripheral components are minimized. • Direct Replacement for MB3800 Applications • Digital Camera • MP3 • Low Battery Operating Applications Ordering Information SO-8 8-pin B3800M FB FB OSC OSC GND GND OUT OUT B3800 P-DIP Operating 8-pin Temp. Range B3800P -40° ...

Page 2

PIN Description Pin No. Symbol I SCP - BR/CTL OUT 6 GND - 7 OSC - Absolute Maximum Rating Parameter Supply Voltage Output source ...

Page 3

Electrical Characteristics Parameter Circuit to Prevent Reset Voltage Malfunction at low input Threshold voltage voltage (U.V.L.O.) Changing current Soft Start Voltage at soft start completion Short Circuit detection Charging current (OSC) Threshold voltage Oscillation freq. Sawtooth wave oscillator Frequency input ...

Page 4

TIMMING DIAGRAM BLOCK DIAGRAM Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B3800 www.baylinear.com ...

Page 5

Typical Characteristics Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B3800 www.baylinear.com ...

Page 6

Typical Characteristics (continued) Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B3800 www.baylinear.com ...

Page 7

Typical Characteristics (continued) Bay Linear B3800 Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B3800 www.baylinear.com ...

Page 8

Application Descriptions Power Supply Control Function Stand- by mode (supply current less) can be set by connecting the BR/ CTL pin (pin 4) to VCC or by making the pin open circuit. Switching Regulator Function Reference voltage ...

Page 9

HOW TO SET THE TIME CONSTANT FOR SOFT START AND SHORT CIRCUIT DETECTION Soft Start At power on, the capacitor CPE connected to the SCP pin starts charging. The PWM comparator compares the soft start setting voltage as a proportion ...

Page 10

SOIC Pin 1 1.27 (0.50) BSC 5.0 (0.197) 4.8 (0.188) 0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering ...

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