200mA Step-Up Converters in 6-Pin

SOT23 and TDFN

6

_______________________________________________________________________________________

SHUTDOWN RESPONSE

Ω)

MAX8569 toc13

2V

3.3V

2V/div

100

µs/div

Typical Operating Characteristics (continued)

SWITCHING WAVEFORMS

Ω)

MAX8569 toc14

100mV/div

2V/div

500mA/div

(AC-COUPLED)

10

µs/div

Pin Description

PIN

MAX8569A

MAX8569B

NAME

FUNCTION

11

SHDN

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

44

LX

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

—

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.