MAX8902AATA+T-MAX8902BATA+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX8902AATA+T-MAX8902BATA+T
Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package
MAX8902A/MAX8902BLow-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
EVALUATION KIT AVAILABLE
General Description
The MAX8902A/MAX8902B low-noise linear regulators
deliver up to 500mA of output current with only
16µVRMSof output noise in a 100kHz bandwidth. These
regulators maintain their output voltage over a wide
input range, requiring only 100mV of input-to-output
headroom at full load.
These LDOs maintain a low 80µA typical supply cur-
rent, independent of the load current and dropout volt-
age. The regulator control circuitry includes a
programmable soft-start circuit and short circuit,
reverse current, and thermal-overload protection. Other
features include an enable input and a power-OK out-
put (MAX8902B only).
The MAX8902A output voltage can be set to 1.5V, 1.8V,
2.0V, 2.5V, 3.0V, 3.1V, 3.3V, 4.6V, or 4.7V using the
SELA and SELB inputs. The MAX8902B output voltage
can be set between 0.6V and 5.3V with an external
resistor voltage-divider.
Applications
Notebook Computers
MP3 and Portable Media Players
Wireless Headphones
GPS Portable Navigation Devices
Smartphones
Features1.7V to 5.5V Input Voltage Range0.6V to 5.3V Output Voltage Range16µVRMSOutput Noise, 10Hz to 100kHz80µA Operating Supply Current92dB PSRR at 5kHzGuaranteed 500mA Output Current±1.5% Output Accuracy Over Load, Line, and
Temperature100mV (max) Dropout at 500mA Load< 1µA Shutdown Supply Current700mA Short-Circuit ProtectionThermal-Overload ProtectionOutput-to-Input Reverse Current Protection2mm x 2mm x 0.8mm TDFN Package
Ordering Information
OUT
BYP
OFF
OUTPUT
4.6V
SELBSELA
OUTS
GNDEP
10µF
INPUT
4.7V TO 5.5V
0.01µF10µFMAX8902A
Typical Operating Circuits
PARTFEATURESTOP
MARK
MAX8902AATA+Pin-selectable output
voltageABG
MAX8902AATA/V+Pin-selectable output
voltageBRP
MAX8902BATA+Adjustable output voltageABH
MAX8902BATA/V+Adjustable output voltageADL
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Note: All devices are in an 8-pin, 2mm x 2mm TDFN package
with an exposed paddle and operate over the -40°C to +125°C
automotive temperature range.
OUT
BYPON
OFF
OUTPUT ADJUSTABLE
0.6V TO 5.3V
POK
GNDEP
10µF
INPUT
1.7V TO 5.5V
0.01µF10µFMAX8902B
LOGIC
SUPPLY
100kΩ
TO µC
MAX8902A/MAX8902BLow-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
BYP, EN, IN, OUT, SELA, SELB, POKto GND, GS to GND, FB,
OUTS to GND.....................................................-0.3V to +6.0V
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
TDFN (derate 11.9mW/°C above +70°C)...................953.5mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature Range............................-40°C to +150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
Electrical Characteristics
(VIN= VEN= 5V, OUTS = OUT, circuit of Figure 2 (MAX8902A) and Figure 3 (MAX8902B), TA= -40°C to +125°C, unless otherwise
noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Input Voltage Range 1.7 5.5 V
Input Undervoltage Lockout VIN rising, 100mV typical hysteresis 1.5 1.6 1.7 V
OUT
Output Voltage Range VIN VOUT + 0.1V 0.6 5.3 V
Output Voltage Accuracy
VIN = 1.7V to 5.5V for VOUT 1.4V,
VIN = (VOUT + 0.3V) to 5.5V for VOUT > 1.4V,
IOUT = 0.1mA to 500mA
-1.5 +1.5 %
Load Regulation IOUT = 0.1mA to 500mA 0.02 %
Line Regulation
VIN = 1.7V to 5.5V for VOUT 1.4V,
VIN = (VOUT + 0.3V) to 5.5V for VOUT > 1.4V,
IOUT = 200mA
0.04 %
VIN 3.6V, TA +85°C 50 100
VIN 3.6V, TA +125°C 120 Dropout Voltage
(Note 2) IOUT = 500mA
VIN = 1.7V 150
mV
Current Limit VOUT = 95% of regulation, VIN = VOUT + 0.5V 600 700 800 mA
Output Noise IOUT = 100mA, f = 10Hz to 100kHz, CBYP = 0.01μF 16 μVRMS
f = 5kHz 92
f = 10kHz 85 Power-Supply Rejection Ratio IOUT = 10mA
f = 100kHz 62
dB
OUTS (MAX8902A only)
OUTS Input Bias Current In regulation 0.5 7.0 μA
FB (MAX8902B only)
FB Threshold Accuracy VIN = 1.7V to 5.5V, IOUT = 0.1mA to 500mA 0.591 0.600 0.609 V
TA = +25°C -0.1 0.02 +0.1 FB Input Bias Current VFB = 0.6V TA = -40°C 0.03 μA
BYP
BYP Capacitor Range Regulator remains stable 1 100 nF
BYP Startup Current From BYP to GND during startup 50 μA
MAX8902A/MAX8902BLow-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
Electrical Characteristics (continued)
(VIN= VEN= 5V, OUTS = OUT, circuit of Figure 2 (MAX8902A) and Figure 3 (MAX8902B), TA= -40°C to +125°C, unless otherwise
noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
GND
TA < +85°C 80 120 GND Supply Current IOUT = 0mA TA < +125°C 160 μA
TA = +25°C 0.001 +1 GND Shutdown Current VIN = 5.5V, EN = 0V TA = +85°C 0.01 μA
SELA/SELB (MAX8902A only)
When shorted to GND or VIN 500 Select Input Resistance
When open 1 M
Select Input Capacitance When open 10 pF
EN rising 0.8 1.2
EN falling, TA < +85°C 0.4 0.7 Enable Input Threshold VIN = 1.7V to 5.5V
EN falling, TA < +125°C 0.38 0.7
TA = +25°C -1 0.001 +1 Enable Input Bias Current VEN = 0V to 5.5V TA = +85°C 0.01 μA
POK (MAX8902B only)
OUT rising 88 91 94 % POK Threshold OUT voltage when POK
switches OUT falling 88 %
POK Voltage, Low IPOK = 1mA 10 100 mV
TA = +25°C -1 0.001 +1 POK Leakage Current POK = 5.5V, VEN = 0V TA = +85°C 0.01 μA
THERMAL SHUTDOWN
TJ rising 165 Thermal Shutdown Threshold TJ falling 150 °C
OUTPUT TRANSIENT
Load Transient IOUT = 50mA to 500mA to 50mA, tRISE = tFALL= 1μs 25 mV/P-P
Line Transient VIN = 4V to 5V to 4V, tRISE = tFALL = 5μs, IOUT = 500mA 3 mV/P-P
IN-to-OUT Reverse Voltage
Turnoff Threshold IN falling below OUT 10 mV
Note 1:All devices are production tested at TA= +25°C. Specifications over the operating temperature range are guaranteed by
design and characterization.
Note 2:The dropout voltage is defined VIN- VOUT, when VOUTis 5% lower than the value of VOUTwhen VIN= VOUT+ 0.5V.
Typical Operating Characteristics
(MAX8902A, VIN= 3.6V, VOUT= 2.5V, TA= +25°C, unless otherwise noted.)
QUIESCENT CURRENT
EN = HIGH, NO LOAD
MAX8902A/02B toc01
INPUT VOLTAGE (V)
INPUT CURRENT (
LOAD REGULATION
MAX8902A/02B toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.6V INPUT
LINE REGULATION
MAX8902A/02B toc03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
200mA LOAD
40ms/div
LOAD TRANSIENT RESPONSE
50mA TO 500mA TO 50mA
VOUT100mV/div
200mA/div
MAX8902A/02B toc04
IOUT
tRISE = tFALL = 1µs
10µs/div
LINE TRANSIENT RESPONSE
VIN2V/div
2mV/div
MAX8902A/02B toc05
VOUT
2.5V OUTPUT
5Ω LOAD
100µs/div
STARTUP WAVEFORM
VEN
500mV/div
2V/div
200mA/div
MAX8902A/02B toc06
IIN
VOUT
5Ω LOAD
CBYP = 0.01µF100200300400500
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8902A/02B toc07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
3.6V INPUT, 4.6V OUTPUT PRESET
THE SLOPE OF THE LINE INDICATES
A 129mΩ ON-RESISTANCE IN
DROPOUT
PSRR vs. FREQUENCY
MAX8902A/02B toc08
10k1k10010100k
FREQUENCY (Hz)
PSRR (dB)
MAX8902A LDO OUTPUT-NOISE SPECTRAL
DENSITY vs. FREQUENCY
MAX8902A/02B toc09
FREQUENCY (Hz)
100k10k1k100
100E+0
1E+3
10E+3
10E+01M
NOISE DENSITY (nV
Hz)
MAX8902A/MAX8902BLow-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
Detailed Description
The MAX8902A/MAX8902B low-noise, low-dropout lin-
ear regulators deliver up to 500mA of output current
with only 16µVRMSof output noise in a 100kHz band-
width. These regulators maintain their output voltage
over a wide input range, requiring only 100mV of input-
to-output headroom at full load.
The MAX8902 maintains a low 80µA typical supply cur-
rent, independent of the load current and dropout volt-
age. The regulator control circuitry includes a
programmable soft-start circuit and short circuit,
reverse current, and thermal-overload protection. Other
features include an enable input and a power-OK
(POK) output (MAX8902B only). A simplified functional
diagram is shown in Figure 1.
The MAX8902A output voltage can be set to 1.5V, 1.8V,
2.0V, 2.5V, 3.0V, 3.1V, 3.3V, 4.6V, or 4.7V using the
SELA and SELB inputs. The MAX8902B output voltage
can be set between 0.6V and 5.3V with an external
resistor voltage-divider.
Enable (EN)
The MAX8902A/MAX8902B include an enable input,
EN. Pull EN low to shut down the output, or drive EN
high to enable the output. If shutdown is not needed,
connect EN to IN.
MAX8902A/MAX8902BLow-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
Pin Description
NAMEPINMAX8902AMAX8902BFUNCTION
1 IN IN Regulator Power Input. Connect IN to a supply from 1.7V to 5.5V. Bypass IN with a 10μF
ceramic capacitor to GND.
2 GND GND Ground
3 EN EN Enable Input. A logic-low drives the output low through a 3k resistor and reduces the supply
current to less than 1μA. Drive logic-high or connect to IN for normal operation.
SELA —
Output Voltage Select Input. Connect SELA to GND, IN, or leave unconnected. The states of
SELA and SELB are sampled when the regulator turns on and the output voltage is set as
shown in Table 2. 4GS Internally Used. Connect GS to GND.
SELB —
Output Voltage Select Input. Connect SELB to GND, IN, or leave unconnected. The states of
SELA and SELB are sampled when the regulator turns on and the output voltage is set as
shown in Table 2. POK
Power-OK Output. Open-drain output that goes low when the output is above 91% of the
nominal regulation voltage. POK is high impedance in shutdown or when the output is below
the regulation voltage.
OUTS — Output Sense Input. Connect OUTS to the load at a point where accurate regulation is
required, or connect OUTS directly to OUT. 6
— FB Feedback Input. Connect FB to the center of a resistor voltage-divider connected between
OUT and GND to set the output voltage. VFB regulates to 0.6V.
7 BYP BYP
Bypass Input. Connect a 0.01μF ceramic capacitor from BYP to OUT to achieve 16μVRMS
output noise. Adjust the value of this capacitor to control the output slew rate during startup.
Slew Rate = (5V / ms) x (0.01μF / CBYP)
8 OUT OUT Regulator Output. Sources up to 500mA at the output regulation voltage. Bypass with a 10μF
(< 0.03 ESR) capacitor to GND. EP EP Exposed Paddle. Connect the exposed paddle to a ground plane to provide heat sinking.
MAX8902A/MAX8902BLow-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
Bypass (BYP)
The capacitor connected from BYP to OUT filters the
noise of the reference, feedback resistors, and regula-
tor input stage and provides a high-speed feedback
path for improved transient response. A 0.01µF capaci-
tor rolls off input noise at approximately 32Hz.
The slew rate of the output voltage during startup is
also determined by the BYP capacitor. A 0.01µF
capacitor sets the slew rate to 5V / ms. This startup rate
results in a 50mA slew current drawn from the input at
startup to charge the 10µF output capacitance.
VOLTAGE
SELECT
SELA
SELB
990kΩ
OUTS
BYP
OUT
GND
REF
0.6V
BYP
MAX8902A ONLY
CONTROLEN
THERMAL
PROTECTION
POKCURRENT
LIMIT
REVERSE
CURRENT
PROTECTION
MAX8902B ONLY
0.54V
MAX8902A
MAX8902B
Figure 1. Simplified Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8902AATA+T \|MAX8902AATAT	MAXIM	N/a	1981	avai	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package
MAX8902BATA+T	N/A	N/a	2500	avai	Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN Package