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Спецификация 8405 изготовлена «Allegro MicroSystems» и имеет функцию, называемую «LOW-DROPOUT REGULATORS . HIGH EFFICIENCY». |
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Детали детали
Номер произв | 8405 |
Описание | LOW-DROPOUT REGULATORS . HIGH EFFICIENCY |
Производители | Allegro MicroSystems |
логотип |
8 Pages
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8405
PRELIMINARY INFORMATION
(subject to change without notice)
June 25, 1999
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular tele-
phones, the A8405SLH voltage regulators offer the reduced dropout
voltage and quiescent current essential for maximum battery life.
54
Applicable also to palmtop computers and personal data assistants,
these devices deliver a regulated output at up to 200 mA (transient),
which is internally limited, providing short-circuit protection. Regu-
lated output voltages of 2.7, 2.8, 3.0, 3.2, 3.3, 3.6, 3.8, 4.0, and 5.0 V
VR
UCT1 2
3
ROD NLYDwg.PS-021-6
P O*BYPASS (fixed regulators) or
D EADJUST (A8405SLH-ADJ only).
TINUEERENCABSOLUTE MAXIMUM RATINGS
N FInput Voltage, VI . . . . . . . . . . . . . . . 7 V
O EPeak Output Current,
C RIOM . . . . . . . . . . . . . . . . . . 200 mA*
Enable Input Voltage, VE . . . . . . . . . . VI
IS ROperating Temperature Range,
TA . . . . . . . . . . . . . -20°C to +85°C
D OJunction Temperature, TJ . . . . +150°C
FStorage Temperature Range,
TS . . . . . . . . . . . . -40°C to +150°C
* Output current rating is limited by input
—voltage, duty cycle, and ambient temperature.
are currently provided. Other voltages, down to 2.0 volts, are available
on special order.
A PMOS pass element provides a typical dropout voltage of only
100 mV at 100 mA of load current. The low dropout voltage permits
deeper battery discharge before output regulation is lost. Quiescent
current does not increase significantly as the dropout voltage is ap-
proached, an ideal feature in standby/resume power systems where data
integrity is crucial. Regulator accuracy and excellent temperature
characteristics are provided by a bandgap reference. The A8405SLH
includes an ENABLE input to give the designer complete control over
power up, standby, or power down.
These devices are supplied in a thermally enhanced 5-lead small-
outline plastic package similar to the SOT-23, and fitting the SC-74A
footprint. All devices are rated for operation over a temperature range
of -20°C to +85°C.
FEATURES AND BENEFITS
I High Efficiency Provides Extended Battery Life
I 100 mV Typical Dropout Voltage at IO = 100 mA
I 80 µA Typical Quiescent Current
I Low Output Noise
I 200 mA Current-Limited Output
I Improved PSRR and Transient Performance
APPLICATIONS
I Cordless/Cellular/GSM/PHS Telephones
I Personal Data Assistants
I Personal Communicators
I Palmtop Computers
I GPS
I Pagers
Under any set of conditions, do not exceed a
junction temperature of +150°C. See follow-
Always order by complete part number, e.g., A8405SLH-xx , where “xx”
ing pages.
is the required output voltage in tenths or “ADJ” for adjustable.
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8405
LOW-DROPOUT
REGULATORS
FUNCTIONAL BLOCK DIAGRAM
IN 1
ENABLE 3
BIAS
2 GND
DRIVE
ERROR
AMP
5 OUT
5 OUT
ADJUST
4 (SUFFIX
"-ADJ" ONLY)
4 BYPASS
(FIXED REG'S)
BANDGAP
REF.
Dwg. FS-012-7
A8405SLH Maximum Allowable Average Output Current* with device mounted on 2.24" x 2.24"
(56.9 mm x 56.9 mm) solder-coated copper-clad board in still air.
TA
25°C
Allowable Total Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%†
VI - VO
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0* 4.5*
200 200 200 200 200 189 162 142 126
50°C
200
200
200
200
182
152
130
114
101
70°C
200
200
200
182
145
121
104
91
81
85°C
200
200
197
148
118
98
84
74
66
* Absolute maximum peak output current rating is 200 mA; absolute maximum input voltage is 7 V.
† IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 220 x 1.00)
Output current rating can be increased (to 200 mA maximum) by additional heat sinking or reducing the duty cycle.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1999, 2000 Allegro MicroSystems, Inc.
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8405
LOW-DROPOUT
REGULATORS
ELECTRICAL CHARACTERISTICS at TA = +25°C, VE ≥ 2.0 V, CBYPASS = TBD (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min. Typ. Max. Units
Output Voltage
(reference specified VO(nom))
VO
VI ≥ VO(nom) + 1 V, 1 mA ≤ IO ≤ 150 mA*
VI ≥ VO(nom) + 1 V, 1 mA ≤ IO ≤ 150 mA*,
over operating temperature range
— ±0.5 —
— — ±2.0
%
%
VI = VO(nom), IO = 50 mA
— — -0.25 V
Output Volt. Temp. Coeff.
aVO VI = 6 V, IO = 10 mA, TJ ≤ 125°C
— TBD — mV/°C
Output Short-Circuit Current IOM
200 — —
mA
Line Regulation
∆VO(∆VI)
at VI = VO(nom) + 1 V, IO = 3 mA
and VI = 7 V, IO = 3 mA
— 1.0 2.0
mV
Load Regulation
∆VO(∆IO)
at VI = VO(nom) + 1 V, IO = 1 mA
and VI = VO(nom) + 1 V , IO = 150 mA*
— 2.0 —
mV
at VI = 7 V, IO = 1 mA
and VI = 7 V, IO = 150 mA*
— 2.0 —
mV
Dropout Voltage
VImin - VO IO = 100 mA
— 100 —
mV
Ground Terminal Current
IGND
VI = VO(nom) + 1 V, IO = 1 mA
— 80 100 µA
VI = VO(nom) + 1 V, IO = 150 mA*
— 80 100 µA
VI = 7 V, IO = 1 mA
— 80 100 µA
VI = 7 V, IO = 150 mA*
— 80 100 µA
IQ VI ≤ 7 V, VE ≤ 0.8 V, IO = 0 mA
— — 1.0
µA
ENABLE Input Voltage
VEH VI ≥ VO(nom) + 1 V, Output ON
2.0 — —
V
VEL VI ≥ VO(nom) + 1 V, Output OFF
— — 0.4
V
ENABLE Input Current
IE VE = VI = 7 V
— — ±1.0 µA
Internal Reference Voltage
VREF
— 1.26 —
V
ADJUST Input Current
IADJ A8405SLH-ADJ only
— 0.10 —
µA
Rejection Ratio
PSRR
VI = VO(nom) + 1.5 V, Vi = 100 mV,
IO = 30 mA, f = 60 Hz
— 70 —
dB
Output Noise
en
10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF —
0.2 — µV/√Hz
Thermal Shutdown
TJ
— 170 —
°C
Typical values are at TA = +25°C and are given for circuit design information only.
* Pulse test (≤20 ms). See previous page for duty cycle limitations.
www.allegromicro.com
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