AAT3237IGU-1.8-T1 datasheet(10/13 Pages) ANALOGICTECH

Part #	AAT3237IGU-1.8-T1

Description	300mA MicroPower??LDO with PowerOK

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Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

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10 / 13 page

AAT3237

300mA MicroPower™ LDO with PowerOK

10

3237.2006.01.1.4

POK Output

The AAT3237 features an integrated Power-OK

comparator which can be used as an error flag. The

POK open-drain output goes low when OUT is 6%

below its nominal regulation voltage.

Connect a

pull-up resistor from POK to OUT.

Enable Function

The AAT3237 features an LDO regulator enable/

disable function. This pin (EN) is active high and is

compatible with CMOS logic. To assure the LDO

regulator will switch on, the EN turn-on control level

must be greater than 2.0V. The LDO regulator will

go into the disable shutdown mode when the volt-

age on the EN pin falls below 0.6V. If the enable

function is not needed in a specific application, it

may be tied to V

IN to keep the LDO regulator in a

continuously on state.

When the LDO regulator is in shutdown mode, an

internal 1.5k

Ω resistor is connected between V

OUT

and GND. This is intended to discharge C

OUT when

the LDO regulator is disabled. The internal 1.5k

Ω

has no adverse effect on device turn-on time.

Short-Circuit Protection

The AAT3237 contains an internal short-circuit pro-

tection circuit that will trigger when the output load

current exceeds the internal threshold limit. Under

short-circuit conditions, the output of the LDO reg-

ulator will be current limited until the short-circuit

condition is removed from the output or LDO regu-

lator package power dissipation exceeds the

device thermal limit.

Thermal Protection

The AAT3237 has an internal thermal protection cir-

cuit which will turn on when the device die tempera-

ture exceeds 145°C. The internal thermal protection

circuit will actively turn off the LDO regulator output

pass device to prevent the possibility of over-temper-

ature damage. The LDO regulator output will remain

in a shutdown state until the internal die temperature

falls back below the 145°C trip point.

The combination and interaction between the short-

circuit and thermal protection systems allows the

LDO regulator to withstand indefinite short-circuit

conditions without sustaining permanent damage.

No-Load Stability

The AAT3237 is designed to maintain output volt-

age regulation and stability under operational no-

load conditions. This is an important characteristic

for applications where the output current may drop

to zero.

Reverse Output-to-Input Voltage

Conditions and Protection

Under normal operating conditions, a parasitic

diode exists between the output and input of the

LDO regulator. The input voltage should always

remain greater than the output load voltage, main-

taining a reverse bias on the internal parasitic

diode.

Conditions where V

OUT might exceed VIN

should be avoided since this would forward bias

the internal parasitic diode and allow excessive

current flow into the V

OUT pin, possibly damaging

the LDO regulator.

In applications where there is a possibility of V

OUT

exceeding V

IN for brief amounts of time during nor-

mal operation, the use of a larger value C

IN capaci-

tor is highly recommended. A larger value of C

IN

with respect to C

OUT will effect a slower CIN decay

rate during shutdown, thus preventing V

OUT from

exceeding V

IN.

In applications where there is a

greater danger of V

OUT exceeding VIN for extended

periods of time, it is recommended to place a

Schottky diode across V

IN to VOUT (connecting the

cathode to V

IN and anode to VOUT).

The Schottky

diode forward voltage should be less than 0.45V.

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