MAX16910 Datasheet, PDF(11/13 Page) Maxim Integrated Products – 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator

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MAX16910 Datasheet, PDF (11/13 Pages) Maxim Integrated Products – 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator

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200mA, Automotive, Ultra-Low

Quiescent Current, Linear Regulator

ENABLE

ENABLE is an active-high, logic-level enable input that

turns the device on or off. Drive ENABLE high to turn

the device on. An internal 0.65Î¼A pulldown current

keeps the MAX16910 in shutdown mode when driven

by a three-state driver in high-impedance mode, or an

open-drain driver. When in shutdown, the MAX16910

consumes only 1.6Î¼A. ENABLE withstands voltages up

to 45V, allowing it to be driven by high-input level volt-

ages or connected to IN for always-on operation.

Thermal Protection

The MAX16910 features thermal protection. When the

junction temperature exceeds +180Â°C, an internal ther-

mal sensor turns off the pass transistor, and allows the

device to cool. The thermal sensor turns on the pass

transistor again after the junction temperature cools by

25Â°C. This results in a cycled output during continuous

thermal-overload conditions. Thermal protection protects

the MAX16910 in the event of fault conditions. For con-

tinuous operation, do not exceed the absolute maximum

junction temperature rating of +150Â°C.

Output Short-Circuit Current Limit

The MAX16910 features a 330mA current limit. The out-

put can be shorted to GND continuously without dam-

age to the device. During a short circuit, the power dis-

sipated across the pass transistor can quickly heat the

device. When the die temperature reaches +180Â°C, the

MAX16910 turns off the pass transistor and automatically

restarts after the die temperature has cooled by 25Â°C.

RESET Output

The MAX16910 features an active-low, open-drain reset

output. Once the monitored output voltage exceeds the

reset threshold voltage, RESET remains low for the reset

timeout period and then goes high. RESET changes from

high to low whenever the monitored output voltage drops

below the reset threshold voltage. RESET also asserts

low when ENABLE is low and during thermal shutdown.

Timeout

The MAX16910 features a reset timeout period adjustable

input. The internal capacitance produces a 60Âµs default

delay when TIMEOUT is left unconnected. Connect a

capacitor from TIMEOUT to GND to set a higher timeout

period than default. Use the following formula to deter-

mine the reset timeout capacitor:

CTIMEOUT = 0.8 x ITO x TTIMEOUT

where CTIMEOUT is in nF, ITO is in Î¼A, and TTIMEOUT is

in ms.

For example, if ITO is 1Î¼A, CTIMEOUT needs to be 8nF to

get a 10ms delay.

___________Applications Information

Output-Capacitor Selection and

Regulator Stability

For stable operation over the full temperature range,

with fixed 3.3V and 5.0V output voltages, use a low-ESR

4.7Î¼F capacitor. For resistor-programmed output voltag-

es, a 10Î¼F low-ESR ceramic capacitor is recommended

for stable operation. Use larger output-capacitor values

such as 22Î¼F to reduce noise, improve load-transient

response and power-supply rejection. Some ceramic

dielectrics exhibit large capacitance and ESR variations

with temperature. To improve power-supply rejection

and transient response, use a capacitor larger than the

minimum 1Î¼F capacitor between IN and GND.

Available Output-Current Calculation

The MAX16910 provides up to 200mA of continuous

output current. The input voltage range extends to

30V. Package power dissipation limits the amount of

output current available for a given input/output voltage

and ambient temperature. Figure 1 shows the maxi-

mum allowable power dissipation for these devices to

keep the junction temperature below +150Â°C. Figure 1

assumes that the exposed metal pad of the MAX16910 is

soldered to a 1in2 of multilayer copper board. Use Figure

1 to determine the allowable package dissipation for a

given ambient temperature. Alternately, use the following

formulas to calculate the allowable power dissipation PD.

For the TDFN-EP package:

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1.951W

for TA â¤ +70Â°C

0.0244 W

Â°C

(

70Â°C)

for

+ 70Â°C

â¤

ï£¼

ï£´

TA < +125Â°Cï£¾ï£½ï£´

For the SO-EP package:

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1.861W

for TA â¤ +70Â°C

0.0233 W

Â°C

(TA

70Â°C)

for

+ 70Â°C

â¤

ï£¼

ï£´

TA < +125Â°Cï£½ï£´ï£¾

______________________________________________________________________________________ââ 11

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