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MAX1659ESA+T

P1-P3P4-P6P7-P9P10-P12
MAX1658/MAX1659
350mA, 16.5V Input,
Low-Dropout Linear Regulators
4 _______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(V
IN
= 5V (MAX1658), V
IN
= 6V (MAX1659); SHDN = IN; SET = GND; C
IN
= 0.1µF; C
OUT
= 10µF tantalum; T
A
= +25°C; unless
otherwise noted.)
0.990
0.994
0.992
0.996
0.998
1.000
0
100
200 300 400
NORMALIZED OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1658/59 TOC05
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE V
NOMINAL
/V
OUT
(V)
3.3V OUTPUT
5V OUTPUT
0
20
40
60
80
0 3 6 9 1512 18
MAX1658
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX1658/59 TOC06
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
I
L
= 100mA
I
L
= 0mA
V
OUT
= 3.3V
0
500
1000
1500
2000
0 3 6 9 12 15
DROPOUT VOLTAGE
vs. OUTPUT VOLTAGE
MAX1658/59 TOC07
OUTPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
I
L
= 350mA
B
A
MAX1659
LINE-TRANSIENT RESPONSE
MAX1658/59TOC10
A: INPUT VOLTAGE (1V/div), V
IN
= 7V (HIGH), V
IN
= 6V (LOW)
B: OUTPUT VOLTAGE (100mV/div)
100µs/div
V
OUT
= 5.0V
0
200
400
600
100
300
500
700
800
0 100 200 300 400
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1658/59 TOC08
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
V
OUT
= 5.0V
V
OUT
= 3.3V
0
40
80
100
20
60
120
140
0 100 200 300 40050 150 250 350
QUIESCENT CURRENT
vs. LOAD CURRENT
MAX1658/59 TOC09
LOAD CURRENT (mA)
QUIESCENT CURRENT (µA)
B
A
V
OUT
= 5V
MAX1659
LOAD-TRANSIENT RESPONSE
MAX1658/59TOC12
A: OUTPUT VOLTAGE (100mV/div)
B: I
OUT
= 300mA (HIGH), I
OUT
= 40mA (LOW)
200µs/div
B
A
V
OUT
= 3.3V
MAX1658
LOAD-TRANSIENT RESPONSE
MAX1658/59TOC13
A: OUTPUT VOLTAGE (100mV/div)
B: I
OUT
= 300mA (HIGH), I
OUT
= 40mA (LOW)
200µs/div
MAX1658/MAX1659
350mA, 16.5V Input,
Low-Dropout Linear Regulators
_______________________________________________________________________________________ 5
____________________________Typical Operating Characteristics (continued)
(V
IN
= 5V (MAX1658), V
IN
= 6V (MAX1659); SHDN = IN; SET = GND; C
IN
= 0.1µF; C
OUT
= 10µF tantalum; T
A
= +25°C; unless
otherwise noted.)
B
A
0V
3.3V
100µs/div
MAX1658 OVERSHOOT AND
TIME EXITING SHUTDOWN
MAX1658/59TOC14
A: OUTPUT VOLTAGE (1V/div)
B: SHDN PIN VOLTAGE (2V/div)
B
A
0V
5V
100µs/div
MAX1659 OVERSHOOT AND
TIME EXITING SHUTDOWN
MAX1658/59TOC15
A: OUTPUT VOLTAGE (2V/div)
B: SHDN PIN VOLTAGE (2V/div)
10ms/div
10Hz TO 100kHz NOISE, V
OUT
= 5V (1mV/div), I
OUT
= 165mA
OUTPUT NOISE
______________________________________________________________Pin Description
GroundGND8
Regulated Output Voltage. Fixed or adjustable from 1.25V to 16V. Sources up to 350mA. For stable opera-
tion, bypass with a 10µF, low-ESR (<0.2Ω) capacitor from OUT to GND. For improved load-transient
response, use a larger low-ESR capacitor.
OUT4, 5
Unregulated Input Supply Voltage, 2.7V to 16.5V input range. The IN pins also serve as heatsinks. Connect
to a copper plane to achieve maximum thermal dissipation.
IN3, 6, 7
PIN
Shutdown Input. When SHDN is low, the device turns off and typically draws 0.1µA of supply current.SHDN
2
Output Voltage Input. Connecting SET to ground selects the factory-preset 3.3V (MAX1658) or 5V
(MAX1659) output voltage. For an adjustable output voltage, connect SET to a resistive voltage divider from
OUT to GND.
SET1
FUNCTIONNAME
10
4
10
3
10
2
10
10 50k
OUTPUT NOISE DENSITY
vs. FREQUENCY
MAX1658 TOC02
FREQUENCY (Hz)
OUTPUT NOISE DENSITY (nV
RMS
/√Hz)
V
OUT
= 5V
I
OUT
= 165mA
MAX1658/MAX1659
350mA, 16.5V Input,
Low-Dropout Linear Regulators
6 _______________________________________________________________________________________
MAX1658
MAX1659
P
P
OUT
SET
IN
SHDN
MOSFET
DRIVER
WITH
CURRENT
LIMIT
R2
R1
65mV
GND
DUAL-MODE
COMPARATOR
1.21V
REFERENCE
THERMAL
SENSOR
ERROR
AMPLIFIER
Figure 1. Functional Diagram
_______________Detailed Description
The MAX1658/MAX1659 are micropower, low-dropout
linear regulators featuring Dual Mode™ operation,
which allows them to deliver an adjustable (1.25V to
16.5V) or preset (3.3V for the MAX1658, 5V for
MAX1659) output. They supply up to 350mA while
requiring only 120µA of supply current (typically 30µA
with no load). The devices include thermal shutdown
circuitry, output current limiting, a P-channel pass tran-
sistor, a Dual Mode comparator, and a feedback volt-
age divider. Figure 1 shows the functional diagram.
The 1.21V reference is connected to the amplifier’s
inverting input. The error amplifier compares this refer-
ence with the selected feedback voltage and amplifies
the difference. The error signal applies the drive to the
P-channel pass transistor. If the feedback voltage is
lower than the reference voltage, the transistor’s gate is
pulled lower, increasing output current.
The output voltage is fed back through an internal
resistor network or an external user-selected network.
The Dual Mode comparator examines the voltage at the
SET pin and selects either the internal or external feed-
back path. If SET is below 65mV, internal feedback sets
the MAX1658’s output voltage to 3.3V and the
MAX1659’s to 5V. Otherwise, external feedback is used
for an adjustable output between 1.25V and 16.5V.
Additional features include internal current limiting,
reverse battery protection, thermal-overload protection,
and a 1µA shutdown mode.
P1-P3P4-P6P7-P9P10-P12

MAX1659ESA+T

Mfr. #:
Buy MAX1659ESA+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators 350mA 16.5V
Lifecycle:
New from this manufacturer.
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