MAX688CSA datasheet(3/12 Pages) MAXIM

Part #	MAX688CSA

Description	High-Accuracy, Low-Dropout Linear Regulators

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Accuracy, Low-Dropout

Linear Regulators

_______________________________________________________________________________________

3

Note 1: Minimum VIN for regulated VOUT depends on the characteristics of the external PNP transistor, and on the load. The refer-

ence and comparators are functional down to the minimum voltage specified, but the output may not be in regulation.

Note 2: Dropout voltage is defined as VIN - VOUT when VOUT is 50mV below its value at VIN = VNOM + 1V.

Note 3: The start-up time specification is the time taken from ON or SHDN rising to BASE sinking current. VOUT rise time is longer

and is a function of load capacitance, C2, and load resistance, RL.

Note 4: Minimum load capacitance is a function of RL. Minimum C2 = 10µF for loads up to 100mA and 1µF/10mA for higher loads.

ESR of C2 should be no larger than 1/100 of RL. Guaranteed by design.

Note 5: The nominal output voltage, VNOM, is defined under the default conditions of testing: VIN = 3.8V, IBASE = 1mA, TA = TMIN to TMAX.

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 3.8V, SHDN = VIN (MAX688/MAX689), RB = 0Ω, C1 = 2.2µF, C2 = 10µF, C3 = 10nF, TA = TMIN to TMAX, unless otherwise

noted. Typical values are at TA = +25°C.)

Falling VOUT, comparators monitor VOUT

Glitch immunity

Rising SHDN, standby

→on

Shutdown

Standby

Falling VOUT, comparators monitor VOUT

On, SHDN falling

Output turns on

CONDITIONS

µs

100

PFO, SHDN Transient Rejection

mV

70

SHDN Hysteresis

0.2

VSSD

1.0

1.2

VSSY

V

1.25

VSON

SHDN Threshold Voltages

mV

110

170

VNOM -

VPFT

PFO Threshold Voltage Below

VNOM (Note 5)

mV

7

PFO Hysteresis

V

2.96

VSD

Shutdown Threshold Voltage

V

1.0

VIH

ON Threshold Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

ISOURCE = 50µA, part on, VIN = 2.7V

V

VOUT - 0.3

VOH

PFO Output Voltage High

ISINK = 1.2mA, VIN = 2.7V

V

0.06

0.3

VOL

PFO Output Voltage Low

Output remains off

0.2

VIL

nA

0.2

100

ON Input Leakage Current

Falling VOUT, com-

parators monitor VOUT

V

3.07

3.13

3.19

VPFT

PFO Threshold Voltage

MAX688

MAX689

2.77

2.85

2.89

V SHDN = 1.23V

nA

-25

25

SHDN Input Current

10Hz

≤ f ≤ 10kHz, ILOAD = 200mA

V PFO = 11V, V SHDN > 1.25V

ISINK = 1.2mA, VIN = 2.7V

µA

1

66

en

Output Noise Voltage

PFO Off Leakage Current

V

0.06

0.3

VOL

PFO Output Voltage Low

10Hz

≤ f ≤ 1MHz, ILOAD = 200mA

µVRMS

105

Falling VOUT, comparators monitor VOUT

mV

20

70

VPFT - VSD

Shutdown Threshold Voltage

Below VPFT

mV

7

PFO Hysteresis

MAX688/MAX689: SHDN, PFO

MAX687: ON, PFO, SHDN

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