MAX1613EEE-T Maxim Integrated, MAX1613EEE-T Datasheet

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MAX1613EEE-T

Manufacturer Part Number
MAX1613EEE-T
Description
Battery Management
Manufacturer
Maxim Integrated
Series
MAX1612, MAX1613r
Datasheet
The MAX1612/MAX1613 manage the bridge battery
(sometimes called a hot-swap or auxiliary battery) in
portable systems such as notebook computers. They
feature a step-up DC-DC converter that boosts 2-cell or
3-cell bridge-battery voltages up to the same level as
the main battery. This voltage boosting technique
reduces the number of cells otherwise required for a 6-
cell plus diode-OR bridging scheme, reducing overall
size and cost. Another key feature is a trickle-charge
timer that minimizes battery damage caused by con-
stant charging and eliminates trickle-charge current
drain on the main battery once the bridge battery is
topped off.
These devices contain a highly flexible collection of
independent circuit blocks that can be wired together
in an autonomous stand-alone configuration or used in
conjunction with a microcontroller. In addition to the
boost converter and charge timer, there is a micropow-
er linear regulator (useful for RTC/CMOS backup as
well as for powering a microcontroller) and a high-pre-
cision low-battery detection comparator.
The two devices differ only in the preset linear-regulator
output voltage: +5.0V for the MAX1612 and +3.3V for
the MAX1613. Both devices come in a space-saving
16-pin QSOP package.
19-4785; Rev 0; 11/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAIN BATTERY
ADAPTER
Notebook Computers
Portable Equipment
Backup Battery Applications
AUXILIARY
WALL
BATTERY
BRIDGE
OR
BBATT
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
LRI
APPLICATION
MAX1612
MAX1613
CIRCUIT
General Description
DC-DC
OUTPUT
Bridge-Battery Backup Controllers
Applications
CONVERTER
MAX1630
DC-DC
V+
+3.3V
+5V
V
CPU
MAX1612EEE
MAX1613EEE
Reduce Battery Size and Cost
Four Key Circuit Blocks
Low 18µA Quiescent Current
Selectable Charging/Discharging Rates
Preset Linear-Regulator Voltage
4V to 28V Main Input Voltage Range
Internal Switch Boost Converter
Small 16-Pin QSOP Package
TOP VIEW
PART
Adjustable Boost DC-DC Converter
NiCd/NiMH Trickle Charger
Always-On Linear Regulator (+28V Input)
Low-Battery Detector
5V (MAX1612)
3.3V (MAX1613)
BBATT
DCMD
CCMD
BBON
FULL
ISET
LBO
LX
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
1
2
6
3
4
5
7
8
for Notebooks
Ordering Information
MAX1612
MAX1613
QSOP
Pin Configuration
16
15
14
13
12
11
10
9
16 QSOP
16 QSOP
PIN-PACKAGE
LRI
LRO
PGND
CD
CC
GND
LBI
FB
Features
1

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MAX1613EEE-T Summary of contents

Page 1

... Always-On Linear Regulator (+28V Input) Low-Battery Detector Low 18µA Quiescent Current Selectable Charging/Discharging Rates Preset Linear-Regulator Voltage 5V (MAX1612) 3.3V (MAX1613 28V Main Input Voltage Range Internal Switch Boost Converter Small 16-Pin QSOP Package PART MAX1612EEE MAX1613EEE Applications TOP VIEW V+ MAX1630 +3.3V +5V DC-DC CONVERTER V CPU for Notebooks ...

Page 2

... LBO, FULL Output Voltage Low LBI Comparator Response Time _______________________________________________________________________________________ Continuous Power Dissipation (T QSOP (derate 8.30mW/°C above +70°C) .................... 667mW Operating Temperature Range MAX1612/MAX1613EEE ...................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C + 0.3V) Lead Temperature (soldering, 10sec) ............................ +300°C LRO = 3V BBATT ...

Page 3

Bridge-Battery Backup Controllers ELECTRICAL CHARACTERISTICS (continued) = 20V, CCMD = DCMD = BBON = LRO LRI ISET T = +25°C.) (Note 1) A PARAMETER SYMBOL DC-DC CONVERTER FB Trip Point FB Input Current LX Switch Current ...

Page 4

Bridge-Battery Backup Controllers for Notebooks (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. OUTPUT CURRENT (BBATT = 2.4V OUT OUT OUT 60 50 ...

Page 5

Bridge-Battery Backup Controllers PIN NAME Bridge-Battery Charge-Current Input. Connect a current-setting resistor from this input to a voltage 1 ISET higher than the bridge battery. Maximum current rating is 10mA. Pulling ISET below 0.4V resets the internal counter. 2 BBATT ...

Page 6

Bridge-Battery Backup Controllers for Notebooks V MAIN +3.3/+5V LRO LINEAR REGULATOR TO EXTERNAL LOADS 2.0V REFERENCE GND CC CHARGE OSCILLATOR DISCHARGE OSCILLATOR C CD Figure 1. Functional Diagram _______________Detailed Description The MAX1612/MAX1613 manage the bridge battery (auxiliary ...

Page 7

Bridge-Battery Backup Controllers 1M MICROCONTROLLER 250k I/O 2N7002 BBON Noise Sensitivity Figure 2. Reducing specifications vary, the counter frequency can be adjusted to accommodate these variances by adjusting C . Similarly, the discharging oscillator frequency can CC be adjusted with ...

Page 8

Bridge-Battery Backup Controllers for Notebooks BRIDGE 100 F BATTERY ALWAYS-ON OUTPUT +5V/3. 470k 470k 160k Figure 3. Stand-Alone Application The counter block can be used to estimate the charge remaining in the battery. For example, if the maximum ...

Page 9

Bridge-Battery Backup Controllers BRIDGE BATTERY V 470k 470k CC MICROCONTROLLER I/O I/O I/O 250k I/O I/O I/O 2N7002* *OPTIONAL, TO RESET COUNTER Figure 4. Microcontroller-Based Application Low-Battery Comparator (LBI, The MAX1612/MAX1613 feature a low-battery com- parator with a factory-preset 1.8V ...

Page 10

Bridge-Battery Backup Controllers for Notebooks where I is the peak current, I PEAK OUT rent the bridge-battery voltage, V BBATT ward drop across D1 the output voltage, I OUT average current provided by the bridge battery, ...

Page 11

Bridge-Battery Backup Controllers Table 5. Surface-Mount Inductor Information MANUFACTURER INDUCTANCE AND PART (µH) Sumida CD43-8R2 8.2 Sumida CD43-150 15 Sumida CD54-100 10 Sumida CD54-150 15 Sumida CD54-220 22 where V is the DC-DC converter’s output voltage OUT and V is ...

Page 12

Bridge-Battery Backup Controllers for Notebooks Chip Information TRANSISTOR COUNT: 3543 12 ______________________________________________________________________________________ Package Information ...

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