Rainbow Electronics MAX16024 - Manual

General Description
The MAX16023/MAX16024 low-power battery-backup cir-
cuits with a regulated output are capable of delivering up
to 100mA output current. The MAX16023/MAX16024
include a low-dropout regulator, a microprocessor (µP)
reset circuit, and a battery switchover circuit. Additional
available features include a manual reset, a power-fail
comparator, and a battery-on indicator. These devices
reduce the number of external components to minimize
board space and improve reliability.
The MAX16023/MAX16024 are ideally suited for provid-
ing power for backing up critical memory such as static
random-access memory (SRAM) or real-time clocks
(RTCs). The regulated output is powered by V
CC when it
is present and switches over to the backup power dur-
ing brownout. The MAX16023/MAX16024 accept an
input voltage from 1.53V to 5.5V and provide fixed stan-
dard output voltages of 1.2V, 1.8V, 2.5V, 3.0V, and 3.3V.
The MAX16024 offers the ability to externally set the out-
put voltage using a resistive divider. All outputs are
available with push-pull or open-drain configurations.
The MAX16023 offers a power-fail comparator for monitor-
ing an additional voltage or for providing an early power-
fail warning. Another feature includes a manual-reset input
(MAX16023/MAX16024). The MAX16024 also features
a battery-on indicator and chip-enable gating function.
The MAX16023/MAX16024 are offered in 8- and 10-pin
TDFN packages and are fully specified from -40°C to
+85°C temperature range.
Applications
Main/Backup Power for RTCs/SRAM
Industrial Controls
GPS Systems
Set-Top Boxes
Point-of-Sale Equipment
Portable/Battery Equipment
Features
♦ System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V
Power-Supply Voltages
♦ 100mA Low-Dropout Regulator
♦ Factory-Trimmed and Adjustable Output Voltages
♦ 1.53V to 5.5V Operating Voltage Range
♦ Low-Power Consumption: 4µA (typ)
♦ Power-Fail Comparators for Monitoring Voltages
Down to 0.6V
♦ Battery-On Indicator
♦ Battery Freshness Seal
♦ On-Board Gating of CE Signals, 1.5ns
Propagation Delay (MAX16024)
♦ Debounced Manual-Reset Input
♦ 145ms (min) Reset Timeout Period
♦ Tiny 8-Pin and 10-Pin TDFN Packages
♦ UL
® Certified to Conform to IEC60950-1
MAX16023/MAX16024
Battery-Backup Circuits with
Regulated Output Voltage
________________________________________________________________ Maxim Integrated Products 1
19-4249; Rev 0; 8/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX16023_TA_ _ _+T -40°C to +85°C 8 TDFN-EP*
MAX16024_TB_ _ _+T -40°C to +85°C 10 TDFN-EP*
The first placeholder “_” designates reset output options. A letter
“L” in this placeholder indicates a push-pull output and letter “P”
indicates an open-drain output. The next placeholder “_” desig-
nates the reset threshold (Table 1). The last two placeholders
“_ _” designate output voltage (Table 2). For the MAX16024 with
adjustable output voltage version, there are no last two place-
holders.
+
Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*
EP = Exposed pad.
Pin Configurations
8 7 6 5
1 2 3 4
PFO GND
*EP *EP
*EP = EXPOSED PAD
RESET OUT
PFI MR
BATT
V CC
MAX16023
TDFN
10 9 8 7
1 2 3 4
GND OUT RESET CEOUT
BATT CEIN
V CC MR
6
5
BATT ON
SET
MAX16024
TDFN
+ +
UL is a registered trademark of Underwriters Laboratories, Inc.