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參數(shù)資料
| 型號(hào)： | B5213 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 100mA. 礐ap. Low Dropout Voltage Regulator Smallest SC70 |
| 中文描述： | 100mA的。礐鴨。低壓差線性穩(wěn)壓器最小的SC70封裝 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 289K |
| 代理商： | B5213 |
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
B5213
APPLICATION HINTS
The B5213 is a low dropout, linear regulator
designed primarily for battery- powered applications.
The B5213 can be used with low cost ceramic
capacitors, typical value of 0.47 μF.
As illustrated in the simplified schematics, the B5213
consists of a 1.25V reference, error amplifier, P-
channel pass transistor and internal feedback voltage
diode. The 1.25V reference is connected to the input
of the error amp. The error amp compares this
reference with the feedback voltage. If the feedback
voltage is lower than the reference, the pass transistor
gate is pulled lower allowing more current to pass
and increasing the output voltage. If the feedback
voltage is too high, the pass transistor gate is pulled
up allowing less current to pass to the output. The
output voltage is feedback through the resistor
divider. Additional blocks include short circuit
current protection and thermal protection.
The B5213 features an 80mA P- channel MOSFET
transistor. This provides several advantages over
similar designs using PNP pass transistors including
longer battery life.
The P- channel MOSFET requires no base drive,
which reduces quiescent current considerably. PNP
based regulators waste considerable amounts of
current in dropout when the pass transistor saturates.
They also have high base drive currents under large
loads. The B5213 does not suffer from these
problems and consumes only the specified quiescent
current under light and heavy loads.
External Capacitors
Like any low- dropout regulators, the B5213 requires
external capacitors for regulator stability. The B5213
is specially designed for portable applications
requiring minimum board space and the smallest
components.
A 0.1μF capacitor should be placed from V
IN
to
GND if there is more than 10 inches of wire between
the input and AC filter or when a battery is used as
the input. This capacitor must be
Located a distance of not more than 1cm from the
input pin and returned to a clean analog ground.
The B5213 is designed to work with small ceramic
output capacitors. Ceramic capacitors ranging between
0.47 μF to 4.7 μF are the smallest and least expensive.
No- Load Stability
The B5213 will remain stable and in regulation with
no- load (other than the internal voltage divider). This
is especially important in CMOS RAM keep- alive
applications.
Enable Input
The B5213 is shut off by pulling the VEN pin below
0.6V; all internal circuitry is powered off and the
quiescent current is typically 1 μA. Pulling the V
EN
high above 2V re- enables the device and allows
operation. If the shut down feature is not used, the V
EN
pin should be tied to V
IN
to keep the regulator output
on all the time.
Thermal Behavior
The B5213 regulator has internal thermal shutdown to
protect the device from over heating. Under all
operating
conditions,
the
temperature of the B5213 must be below 125
°
C.
Maximum power dissipation can be calculated based
on the output current and the voltage drop across the
part. The maximum power dissipation is
P
D( MAX)
= ( T
J( MAX)
- T
A
)/
φ
JA
φ
JA
is the junction- to- ambient thermal resistance, 478
°
C/ W for the B5213 in the SC70 package. T
A
is the
maximum ambient temperature T
J(
maximum junction temperature of the die, 125
°
C
When operating the B5213 at room temperature, the
maximum power dissipation is 209mW.
The actual power dissipated by the regulator is
PD = ( V
IN
- V
OUT
) I
L
+ V
IN
I
GND
The figure below shows the voltage and currents,
which are present in the circuit.
maximum
junction
MAX)
is the
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