MAX1963ETT300-T Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1963ETT300-T Datasheet PDF : 12 Pages
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Low-Input-Voltage, 300mA LDO Regulators
with RESET in SOT and TDFN
The MAX1963/MAX1976 deliver up to 300mA and oper-
ate with an input voltage up to +3.6V. However, when
using the 6-pin SOT23 version, high output currents
can only be sustained when the input-output differential
voltage is less than 2V, as shown in Figure 2.
The maximum allowed power dissipation for the 6-pin
TDFN is 1.951W at TA = +70°C. Figure 3 shows that the
maximum input-output differential voltage is not limited
by the TDFN package power rating.
Applications Information
Capacitor Selection and
Regulator Stability
Capacitors are required at the MAX1963/MAX1976
input and output for stable operation over the full tem-
perature range and with load currents up to 300mA.
Connect a 1µF ceramic capacitor between IN and GND
and a 4.7µF low-ESR ceramic capacitor between OUT
and GND. The input capacitor (CIN) lowers the source
impedance of the input supply. Use larger output
capacitors to reduce noise and improve load-transient
response, stability, and power-supply rejection.
The output capacitor’s equivalent series resistance
(ESR) affects stability and output noise. Use output
capacitors with an ESR of 30mΩ or less to ensure sta-
bility and optimize transient response. Surface-mount
ceramic capacitors have very low ESR and are com-
monly available in values up to 10µF. Connect CIN and
COUT as close to the MAX1963/MAX1976 as possible
to minimize the impact of PC board trace inductance.
Noise, PSRR, and Transient Response
The MAX1963/MAX1976 are designed to operate with
low dropout voltages and low quiescent currents in bat-
tery-powered systems while still maintaining good
noise, transient response, and AC rejection. See the
Typical Operating Characteristics for a plot of Power-
Supply Rejection Ratio (PSRR) versus Frequency.
When operating from noisy sources, improved supply-
noise rejection and transient response can be achieved
by increasing the values of the input and output bypass
capacitors and through passive filtering techniques.
The MAX1963/MAX1976 load-transient response (see
the Typical Operating Characteristics) shows two com-
ponents of the output response: a near-zero DC shift
from the output impedance due to the load-current
change, and the transient response. A typical transient
response for a step change in the load current from 20mA
to 200mA is 20mV. Increasing the output capacitor’s value
and decreasing the ESR attenuates the overshoot.
Input-Output (Dropout) Voltage
A regulator’s minimum input-output voltage difference
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Because the
MAX1963/MAX1976 use a P-channel MOSFET pass tran-
sistor, the dropout voltage is a function of drain-to-source
on-resistance (RDS(ON) = 0.33Ω) multiplied by the load
current (see the Typical Operating Characteristics).
VDROPOUT = VIN - VOUT = 0.33Ω ✕ IOUT
The MAX1963/MAX1976 ground current reduces to 70µA
in dropout.
Selector Guide
VOUT
(V)
SUFFIX
MAX1963
TOP MARK
SOT TDFN
MAX1976
TOP MARK
SOT TDFN
0.75
075 AABA AFQ AAAQ AGA
0.85
085
—
—
AABP AHD
0.90
090 AABB AFR AABK AGB
1.00
100 AABC AFS AABL AGC
1.10
110 AABD AFT AABM AGD
1.20
120
AABE
AFU
AAAK AGE
1.30
130
AABF
AFV
AABN AGF
1.50
150 AABG AFW AAAL AGG
1.60
160
—
—
AABO AHC
1.80
180 AABH AFX AAAM AGH
2.50
250
AABI
AFY AAAN AGI
2.85
285
—
—
AAAO AGJ
3.00
300
AABJ
AFZ
AAAP AGK
(Note: Standard voltage options, shown in bold, are available.
Contact the factory for other output voltages between 1.5V and
4.5V. Minimum order quantity is 15,000 units.)
Chip Information
TRANSISTOR COUNT: 2556
PROCESS: BiCMOS
8 _______________________________________________________________________________________
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