Bay Linear
Inspire the Linear Power
Switching Regulator Controller
Step Up Low Voltage (BIPOLAR)
B3800
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.
Features
•
•
•
•
•
•
•
•
•
•
•
•
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
Applications
•
Pin Connection
Ordering Information
SO-8
8-pin
B3800M
P-DIP
8-pin
B3800P
Operating
Temp. Range
-40°C to 85°C
8-
8-Pin Surface Mount
-IN
SCP
Vcc
BR/CTL
1
2
3
4
8
7
6
5
FB
OSC
GND
OUT
Top View
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3800
PIN Description
Pin No.
Symbol
I/O
Description
Error amplifier inverting
Soft start and SCP setting capacitor connection pin
Power supply pin
Output current setting and control pin
Totem-pole type output pin
Ground pin
Capacitor and resistor connection pin setting the oscillation frequency
Error amplifier output pin
1
2
3
4
5
6
7
8
-IN
SCP
V
CC
BR/CTL
V
OUT
GND
OSC
FB
I
-
-
I
O
-
-
O
Absolute Maximum Rating
Parameter
Supply Voltage
Output source current
Output sink current
Allowable dissipation
Symbol
Value
Unit
V
CC
16
V
+
I
O
-50
mA
-
I
O
50
mA
570
mW
SOP-8, T
a
≤+25°C
430
mW
SOP-8, T
a
≤+25°C
580
mW
SSOP-8, T
a
≤+25°C
Operating temperature
T
op
-30 to +85
°C
Storage temperature
Tstg
-55 to +125
°C
WARNING:
Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in
excess of absolute maximum ratings. Do not exceed these ratings.
Recommended Operating Condition
Parameter
Symbol
Min
Values
Typ.
Max.
Unit
Power Supply Voltage
V
CC
1.8
-
15
V
Error amplifier input voltage
V
I
-.0.2
-
1.0
V
BR/CTL pin input voltage
V
BR
-0.2
-
V
CC
V
+
Output source current
I
O
-40
-
-
mA
Output sink current
I
O-
-
-
40
mA
SCP pin capacitance
C
PE
-
0.1
-
µF
Phase compensation capacitance
C
P
-
0.1
-
µF
Output current setting resistance
R
B
150
390
5000
Ω
Timing resistance
1.0
3.0
10.0
R
T
kΩ
Timing Capacitance
C
T
100
270
10000
pF
Oscillation frequency
f
OSC
10
500
1000
kHz
Operation temperature
T
OP
-30
+30
+85
°C
WARNING:
Recommended operating conditions are normal operating ranges for the semiconductor device. All the device’s
electrical characteristics are warranted when operated within these ranges. Always use semiconductor devices within the
recommended operating conditions. Operation outside these ranges may adversely affect reliability and could result in device
failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users
considering application outside the listed conditions are advised to contact Bay Linear.
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3800
Electrical Characteristics
Parameter
Circuit to Prevent
Malfunction at low input
voltage (U.V.L.O.)
Soft Start
Short Circuit detection
(OSC)
Sawtooth wave oscillator
(OSC)
Reset Voltage
Threshold voltage
Changing current
Voltage at soft start
completion
Charging current
Threshold voltage
Oscillation freq.
Frequency input
stability
Frequency variation
with temperature
Input threshold
voltage
V
T
input stability
V
T
variation with
temperature
Input bias current
Voltage gain
Frequency bandwidth
Maximum output
voltage range
Output source current
Output sink current
Maximum duty cycle
Symbol
V
R
V
TH
I
CS
V
TS
I
cpc
V
PC
f
ocs
f
dv
f
dt
V
T
V
Tdv
V
TDT
I
B
A
V
BW
V
OM+
V
OM-
I
OM+
I
OM_
t
DUTY
V
OH1
V
OH2
V
OL1
V
OL2
I
O+
I
O-
R
O
V
BR
I
OFF
I
ON
I
BR
I
CCB
I
CC
Conditions
-
Min.
-
1.1
-1.5
Value
Typ.
-
1.3
-1.0
0.8
-1.0
0.8
500
2
5
500
5
1
-0.2
100
6
0.87
0.05
-40
40
75
1.2
1.0
0.1
0.1
-30
60
30
0.3
-
-
-
-
5.5
Max.
0.9
1.5
-0.7
0.9
-0.7
0.9
600
10
-
520
20
-
1.0
145
-
-
0.2
-24
-
85
-
-
0.2
0.2
-20
-
40
0.4
0
-45
-0.1
1
9.3
Unit
V
V
µA
V
µA
V
kH
z
%
%
mV
mV
%
µA
V/
V
M
Hz
V
µA
µA
%
V
V
V
V
mA
mA
kΩ
V
µA
µA
mA
mA
mA
V
SCP
=0V
V
SCP
=0V
-
0.7
-1.5
0.7
400
-
-
480
-
-
-1.0
-
70
-
-
0.78
-
-
24
65
1.0
0.8
-
-
-
30
20
0.2
-20
-
-1.8
-
-
R
T
=3.0kΩ, C
T
=270pF
V
CC
=2V to 15V
T
a
=-30°C to +85°C
V
FB
=450mV
V
CC
= 2V to 15V
T
a
= -30°C to +85°C
V
IN
=0V
Error amplifier
A
V
=0dB
V
FB
=0.45V
R
T
=3.0kΩ, C
T
=270pF
V
FB
=0.8V
R
B
=390Ω, I
O
= -15mA
R
B
=750Ω, I
O
= -10mA,
V
CC
=1.8V
R
B
=390Ω, I
O
=15mA
R
B
=750Ω, I
O
=10mA,
V
CC
=1.8V
R
B
=390Ω, V
CC
=0.9V
R
B
=390Ω, V
CC
=0.3V
-
R
B
=390Ω,
-
BR/CTL pin open or
V
cc
R
B
=390Ω,
Idle period adjustable
section
Output voltage
Output section
Output source current
Output sink current
Pull down resistance
Pin Voltage
Input off condition
Input on condition
Pin current range
Stand-by current
Entire device
Average supply
current
Output current setting
section/ Control section
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3800
TIMMING DIAGRAM
BLOCK DIAGRAM
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3800
Typical Characteristics
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
京公网安备 11010802033920号
EEWORLD
