參數(shù)資料
型號(hào)： MAX6470UT15BD3
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit
中文描述： FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, PDSO6
封裝： MO-178AB, SOT-23, 6 PIN
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 556K
代理商： MAX6470UT15BD3
M
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
_______________________________________________________________________________________
9
Detailed Description
The MAX6469
–
MAX6484 are ultra-low, quiescent cur-
rent, low-dropout linear regulators with an integrated
microprocessor reset circuit. These devices guarantee
300mA (min) drive capabilities and are available with
preset output voltages in 100mV increments between
+1.5V and +3.3V. The internal reset circuit monitors the
regulator output voltage and asserts the reset output
when the regulator output is below the microprocessor
supply tolerance.
Regulator
The regulator core operates with +2.5V to +5.5V input
voltage range. The output voltage is offered in 100mV
increments between +1.5V and +3.3V (contact factory
for other output voltage options). The MAX6469
–
MAX6472/MAX6477
–
MAX6480 offer an adjustable out-
put voltage implemented with an external resistor-
divider network between OUT, SET, and GND (Figure
1). SET must be connected to either GND for fixed
V
OUT
or to an external divider for adjustable V
OUT
. The
MAX6469
–
MAX6472/MAX6477
–
MAX6480 automatically
determine the feedback path depending on the con-
nection of SET. The
Typical Operating Circuit
shows a
typical connection for the MAX6469. OUT is an internal-
ly regulated low-dropout (LDO) linear regulator that
powers a microprocessor.
Reset Circuit
The reset supervisor circuit is fully integrated in the
MAX6469
–
MAX6484 and uses the same reference volt-
age as the regulator. Two supply tolerance reset
thresholds, -7.5% and -12.5%, are provided for each
type of device.
-7.5% Reset:
Reset does not assert until the regulator
output voltage is at least -5% out of tolerance and
always asserts before the regulator output voltage is
-10% out of tolerance.
-12.5% Reset:
Reset does not assert until the regulator
output voltage is at least -10% out of tolerance and
always asserts before the regulator output voltage is
-15% out of tolerance.
RESET
Output
A μP
’
s reset input starts the μP in a known state. The
MAX6469
–
MAX6484 μP supervisory circuits assert
RESET
during power-up, power-down, and brownout
conditions.
RESET
asserts when the input voltage is
below the undervoltage lockout threshold.
RESET
asserts when V
OUT
is below the reset threshold and
remains asserted for at least the minimum selected reset
timeout period (t
RP
, Table 3) after V
IN
rises above the
undervoltage lockout threshold and V
OUT
rises above
the reset threshold.
RESET
asserts when
MR
is pulled
low (MAX6471
–
MAX6474/MAX6479
–
MAX6482).
RESET
asserts when
SHDN
is pulled low (MAX6469/
MAX6470/MAX6473
–
MAX6478/MAX6481
–
MAX6484).
Shutdown
(MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–
MAX6484 only)
SHDN
allows the regulator to shut down, thereby reduc-
ing the total I
IN
consumption of the device.
SHDN
pro-
vides a digitally controlled active-low shutdown. In
shutdown mode, the pass transistor, control circuit, and
reference turn off to reduce the supply current to below
0.1μA. Connect
SHDN
to IN for normal operation.
Manual Reset Input
(MAX6471–MAX6474/MAX6479–MAX6482 only)
Many μP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on
MR
asserts reset while the regulator output voltage is still
within tolerance.
Reset remains asserted while
MR
is low and for the
reset timeout period (t
RP
) after
MR
returns high. The
MR
input has an internal pullup of 40k
(typ) to OUT.
MR
can be driven with TTL/CMOS logic levels or with
open-drain/collector outputs. Connect a normally open
switch from
MR
to GND to create a manual reset func-
tion; external debounce circuitry is not required. If
MR
is driven from long cables or the device is used in a
noisy environment, connect a 0.1μF capacitor from
MR
to GND to provide additional noise immunity.
Feedback Input
(MAX6475/MAX6476/MAX6483/MAX6484 only)
The feedback input (FB) connects to an internal resistor-
divider network (
Functional Diagram
). FB is not internally
connected to V
OUT
, and as a result can be used to
MAX6469–MAX6472
MAX6477–MAX6480
R1
R2
C
OUT
MANUAL
RESET
GND
IN
OUT
SET
2.5V TO 5.5V
(MR)
( ) ARE FOR MAX6471/MAX6472/MAX6479/MAX6480 ONLY
Figure 1. Adjustable Output Voltage Configuration
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6470UT15BD3-T 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX6470UT15BD4 制造商:Maxim Integrated Products 功能描述:300MA LDO LINEAR REGULATORS WITH IN - Rail/Tube
MAX6470UT15BD4-T 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX6470UT16AD1 制造商:Maxim Integrated Products 功能描述:300MA LDO LINEAR REGULATORS WITH IN - Rail/Tube
MAX6470UT16AD1-T 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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