Rainbow-electronics MAX8569B Manuel d'utilisateur télécharger pdf (Page 6)

MAX8569A/MAX8569B

200mA Step-Up Converters in 6-Pin

SOT23 and TDFN

6 _______________________________________________________________________________________

SHUTDOWN RESPONSE

LOAD

= 33Ω)

MAX8569 toc13

3.3V

2V/div

OUT

SHDN

100µs/div

Typical Operating Characteristics (continued)

(Circuit of Figure 2, V

OUT

= 3.3V, V

BATT

= +2V, T

= +25°C, circuit of Figure 1, T

= +25°C, unless otherwise noted.)

SWITCHING WAVEFORMS

LOAD

= 33Ω)

MAX8569 toc14

100mV/div

2V/div

500mA/div

OUT

(AC-COUPLED)

10µs/div

Pin Description

MAX8569A

MAX8569B

NAME

FUNCTION

11SHDN

Shutdown Input. Drive SHDN low to place the MAX8569 in shutdown mode. SHDN can be

used for a low-battery cutoff (1.228V threshold). See the Low-Battery Cutoff section for

details. Drive SHDN high for normal operation.

2 2 BATT

Battery Voltage Connection. Connect BATT to a 1.5V to 5.5V supply. Bypass BATT to GND

with a 10µF or larger ceramic capacitor.

3 3 GND Ground

44LX

Inductor Connection. Connect the switched side of the inductor to LX. During shutdown,

LX is connected to OUT.

5 5 OUT

Output Voltage. Bypass OUT to GND with a 10µF or larger ceramic capacitor. During

shutdown, OUT is connected to LX. OUT is also the bootstrapped supply input for the IC.

6 — FB

Feedback Input. Connect FB to the center tap of an external resistor-divider from OUT to

GND to set the output voltage. V

regulates to 1.228V.

— 6 RST

Reset Output. RST is an open-drain output that goes high impedance when the output

voltage rises above 90% of the nominal regulation voltage. RST pulls low when the output

is below 90% of the nominal regulation voltage. RST is high impedance during shutdown.

——EP

Exposed Paddle (TDFN Package Only). Connect to the PC board ground plane for

increased thermal performance.

1 2 3 4 5 6 7 8 9 10 11

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Rainbow-electronics MAX8569B Manuel d'utilisateur Page 6

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