MAX8569A 查看數據表（PDF） - Maxim Integrated

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MAX8569A

200mA Step-Up Converters in 6-Pin SOT23 and TDFN

Maxim Integrated 

200mA Step-Up Converters in 6-Pin

SOT23 and TDFN

Typical Operating Characteristics (continued)

(Circuit of Figure 2, VOUT = 3.3V, VBATT = +2V, TA = +25°C, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

SHUTDOWN RESPONSE

(RLOAD = 33Ω)

MAX8569 toc13

SWITCHING WAVEFORMS

(RLOAD = 33Ω)

MAX8569 toc14

VOUT

(AC-COUPLED)

3.3V

100mV/div

VOUT

2V

VLX

2V/div

VSHDN

100µs/div

2V/div

IL

500mA/div

10µs/div

PIN

MAX8569A MAX8569B

1

1

2

2

3

3

4

4

5

5

6

—

—

6

—

—

NAME

SHDN

BATT

GND

LX

OUT

FB

RST

EP

Pin Description

FUNCTION

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.

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

with a 10µF or larger ceramic capacitor.

Ground

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

LX is connected to 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.

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

GND to set the output voltage. VFB regulates to 1.228V.

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.

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

increased thermal performance.

6 _______________________________________________________________________________________

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