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MAX1538
Power-Source Selector for Dual-Battery Systems
Selector Provides Power-Source Control for Dual-Battery Systems, Minimizes System Cost
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Status
Active: In Production.
Description
The MAX1538 selector provides power-source control for dual-battery systems. The device selects between an AC adapter and dual batteries based on the presence of the three power sources and the state of charge of each battery. The MAX1538 includes analog comparators to detect AC/airline-adapter presence and determine battery undervoltage. Fast analog circuitry allows the device to switch between power sources to implement a break-before-make time, which allows hot swapping of battery packs. The MAX1538 independently performs power-source monitoring and selection, freeing the system power-management µP for other tasks. This simplifies the development of µP power-management firmware and allows the µP to enter standby, reducing system power consumption.
The MAX1538 supports “relearn mode,” which allows the system to measure and fully utilize battery capacity. In this state, the part allows the selected battery to be discharged even when an AC adapter is present. The MAX1538 can also be used to power the system in an aircraft. On detecting an airline adapter, the MAX1538 automatically disables charging or discharging of battery packs and only allows the system to be powered from the adapter.
The MAX1538 is available in a space-saving 28-pin thin QFN package with a maximum footprint of 5mm x 5mm.
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Data Sheet
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An evaluation kit is available: MAX1538EVKIT
Key Features
- Automatically Detects and Responds to:
- Low-Battery Voltage Condition
- Battery Insertion and Removal
- AC-Adapter Presence
- Airline-Adapter Presence
- Step-Down and Step-Up Charger Compatibility
- Fast Break-Before-Make Selection
- Allows Hot Swapping of Power Sources
- No External Schottky Diodes Needed
- 50µA Maximum Battery Quiescent Current
- Implements Battery Capacity Relearning
- Allows Usage of Aircraft Supply
- Direct Drive of P-Channel MOSFETs
- Simplifies Power-Management µP Firmware
- 4.75V to 28V AC-Adapter Input Voltage Range
- Small 28-Pin Thin QFN Package (5mm x 5mm)
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Applications/Uses
- Dual-Battery Portable Equipment
- Internet Tablets
- Notebook and Subnotebook Computers
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Key Specifications:
| Battery Protectors, Selectors and Monitors |
| Part Number |
Functions |
Battery Type |
Parameters Measured |
VSUPPLY
(V) |
VSUPPLY
(V) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| min |
max |
max w/pins |
See Notes |
| MAX1538 |
Selector |
| 2-4 Cell Li-Ion | | 5-10 Cell NiMH |
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Voltage |
4.75 |
28 |
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26 |
-40 to +85 |
$3.13 @1k |
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See All Battery Protectors, Selectors and Monitors (29)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1538ETI
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0025 (PDF)
Use pkgcode/variation: T2855-5*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1538ETI+
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0025 (PDF)
Use pkgcode/variation: T2855+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1538ETI+T
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0025 (PDF)
Use pkgcode/variation: T2855+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1538ETI-T
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Active |
QFN;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-3157
Rev 0;
2004-02-18
This page last modified: 2007-08-28
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