Rainbow Electronics MAX8569B - Manual

General Description
The MAX8569A/MAX8569B low-quiescent-current
boost regulators provide up to 200mA at output volt-
ages up to 5.5V from a 1.5V to 5.5V input source. The
built-in synchronous rectifier allows for over 90% effi-
ciency while achieving small size and low cost by elimi-
nating the need for an external Schottky diode.
The MAX8569A provides an adjustable output while the
MAX8569B is fixed at 3.0V or 3.3V. The MAX8569B fea-
tures a power-on reset output (RST) to signal that the
output has reached regulation. All devices connect the
battery input to the output during shutdown, allowing
the input battery to be used as a backup or real-time
clock supply when the converter is off.
Applications
Features
♦ Over 200mA Available Output Current
♦ 1.5V to 5.5V Input Voltage Range
♦ BATT Connected to OUT in Shutdown for Backup
Power
♦ Up to 95% Efficiency
♦ 7µA Typical Quiescent Current
♦ <1µA Shutdown Supply Current
♦ Internal Synchronous Rectifier
♦ 750mA Switch Current Limit
♦ RST Output (MAX8569B)
♦ Adjustable Output Voltage (MAX8569A)
♦ Fixed 3.0V or 3.3V Output Voltage (MAX8569B)
MAX8569A/MAX8569B
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
________________________________________________________________ Maxim Integrated Products 1
MAX8569A
(MAX8569B)
TOP VIEW
6
FB (RST)
5
OUT
4
LX
SHDN BATT GND
1 2 3
TDFN ( ) ARE FOR THE MAX8569B
1 6
5
MAX8569A
(MAX8569B)
TOP VIEW
SOT23
2
3 4
FB (RST)
OUT
LX
SHDN
BATT
GND
+
+ DENOTES LEAD-FREE PACKAGING
Pin Configurations
Ordering Information
19-3671; Rev 0; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX8569AEUT-T* -40°C to +85°C
6 SOT23-6
(U6FH-6)
MAX8569AETT+ -40°C to +85°C
6 TDFN 3mm x 3mm
(T633-1)
MAX8569BEUT-T* -40°C to +85°C
6 SOT23-6
(U6FH-6)
MAX8569BETT+ -40°C to +85°C
6 TDFN 3mm x 3mm
(T633-1)
MAX8569BETT30+ -40°C to +85°C
6 TDFN 3mm x 3mm
(T633-1)
Selector Guide appears at end of data sheet.
MAX8569B
RST
OUT
2V
INPUT
3.3V, 200mA
OUTPUT
POWER-ON
RESET
LX
OFF
ON
SHDN
BATT
GND
Typical Operating Circuit
Medical Diagnostic
Equipment
Digital Cameras
PDAs and Smartphones
Cordless Phones
Battery Backup
PC Cards
Local 3.3V or 5V Supply
* Future product—contact factory for availability.
+Denotes lead-free packaging.