BAYLI B38C45M, B38C44M, B38C43M, B38C42M Datasheet
Bay Linear
Inspire the Linear Power
BiCMOS Current Mode PWM Controller
Description
The Bay Linear B38C42/43/44/45 are fixed frequency and
high performance current-mode PWM controller in BiCMOS.
They are pin compatible with all bipolar 384X’s controllers are
similar to the MIC38C4X family. These devices are designed
for DC-to-DC converter applications and feature a trimmed
oscillator discharge current and bandgap reference.
The benefit of the BiCMOS process provides significant
performance improvement compared to Bipolar 384X devices.
At 15V
0.17 mA with an operating current reduced to 4mA (typ.) from
14mA. Also, quicker output rise and fall times drive larger
MOSFET ‘s and rail-to-rail output capability improves
efficiency, especially lower supply voltages.
Major differences between members of these series are the
UVLO thresholds. Typical UVLO thresholds of 14.5V (on)
and 9V (off) for the B38C42 and B38C44 devices make them
ideally suited to off-line applications. The corresponding
typical thresholds for the B38C43 and B3845 devcies are 8.4V
(on) and 7.6V (off).
The B39C4X devices are available in 8 pin DIP and SOIC.
Pin Connection
the start-up current is reduced to 50µA (typ.) from
IN
8-SOIC and 8-PDip
COMP
COMP
FB
ISENSE
ISENSE
RT/CT
RT/CT
1
1
2
2
3
3
4
4
8
8
7
7
6
6
5
5
REF
REF
VDD
OUTPUT
OUTPUT
GND
GND
Top
B38C42/43/44/45
Advance Information
Features
• Low-Power BiCMOS Process
• Ultra Low Start-Up Current of 50µA (typ.)
• Very Lower Operating Current (4mA)
• Current Mode Operation ≥ 500KHz
• CMOS outputs with Rail to Rail outputs
• Under Voltage Lockout with Hysteresis
• 5V Trimmed Bandgap Reference
• Trimmed Oscillator Discharged Current
• Low Cross-Conduction Currents
• Available in 8 pin SOIC and 8PDip
• Similar to MIC38C42/43/44/45
• Pin to Pin compatible with UC3842X Family
Applications
• Switched and Current Mode Power Supplies
• Off-line Power Supply
• Step-Up (Buck), Step-Down (Boost) Regulator
• Flyback, Isolated Regulators
• Synchronous FET converters
• Forward Converters
Ordering Information
Devices Package Temp.
B38C42M SO-8
B38C42P 8-DIP
B38C43M SO-8
B38C43P 8-DIP
B38C44M SO-8
B38C44P 8-DIP
B38C45M SO-8
B38C45P 8-DIP
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
B38C4X
Absolute Maximum Rating
Parameter Symbol Value Unit
Supply Voltage V
Switch Supply Voltage V
Output Current I
DD
D
OUT
Zener Current VDD 30 mA
Current Sense Voltage V
Feedback Voltage V
Power Dissipation P
ISENSE
FB
D
Storage Temperature Range T -65 to 150
Lead Temperature (Soldering 10 Sec.) T
L
20 V
20 V
1A A
-0.3 to 5.5 V
-0.3 to 5.5 V
1 W
°C
300
°C
Electrical Characteristics
VDD = 15V (Note 4), RT = 11k, CT = 3.3nF, TA= -40°C to +85°C, unless otherwise specified
Parameter Symbol Conditions MIN TYP MAX UNIT
REFERENCE SECTION
Reference Voltage V
Line Regulation REG
Load Regulation REG
Short Circuit Output Current I
REF
(LINE)
(LOAD)
SC
OSCILLATOR SECTION
Oscillator Frequency f
Frequency Change with Voltage
Oscillator Amplitude V
∆f/∆V
OSC
ERROR AMPLIFIER SECTION
Input Bias Current I
Input Voltage V
Open Loop Voltage Gain G
BIAS
I(E>A)
VO
Power Supply Rejection Ratio PSRR
Output Sink Current I
Output Source Current I
High Output Voltage V
Low Output Voltage V
SINK
SOURCE
OH
OL
OUTPUT SECTION
Low Output Voltage V
High Output Voltage V
Rise Time t
Fall Time t
OL
OH
R
F
TJ = 25 °C. I
12V≤VDD≤18V, IO = 5µA
1mA≤I
REF
= 1mA
REF
≤20mA
T= 25 °C
T= 25 °C
12V≤VCC≤25V
CC
- 1.6 2.3 V
-1 -0.1 1
V1 =2.5V 2.42 2.50 2.58 V
2V≤VO≤4V
CC
≤25V
12V≤V
V2 =2.7V, V1 =1.1V 2 6 - mA
V2=2.3, V1=5V -0.5 -1.0 - mA
V2=2.3, RL= 15Ω to GND
V2=2.7, RL= 15Ω to pin 8
I
= 20mA
SINK
I
= 200mA
SINK
S
= 20mA
ource
S
= 200mA
ource
TJ = 25 °C, CL=1nF (note3)
TJ = 25 °C, CL=1nF (note3)
4.90 5.00 5.10 V
- 2 20
mV
- 1 25
-30 -80 -180 mA
47 52 57 KHz
- 0.05 1 %
P-P
µA
65 90 - dB
60 70 - dB
5 6 - V
- 0.8 1.1 V
-
13
12
0.08
1.4
13.5
13.0
0.4
2.2
-
-
V
V
- 40 70 ns
- 30 50 ns
Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
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