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MAX1551, MAX1555
SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers
First Dual-Input, USB/AC-Adapter, Li+ Chargers in a SOT23 Package Require No External FETs or Diodes
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Status
Active: In Production.
Description
The MAX1551 and MAX1555 charge a single-cell lithium-ion (Li+) battery from both USB and AC adapter sources. They operate with no external FETs or diodes, and accept operating input voltages up to 7V.
On-chip thermal limiting simplifies PC board layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage. When the MAX1551 and MAX1555 thermal limits are reached, the chargers do not shut down, but progressively reduce charging current.
The MAX1551 includes an active-low POK output to indicate when input power is present. If either charging source is active, active-low POK goes low. The MAX1555 instead features a active-low CHG output to indicate charging status.
With USB connected, but without DC power, charge current is set to 100mA (max). This allows charging from both powered and unpowered USB hubs with no port communication required. When DC power is connected, charging current is set at 280mA (typ). No input-blocking diodes are required to prevent battery drain.
The MAX1551 and MAX1555 are available in 5-pin thin SOT23 packages and operate over a -40°C to +85°C range.
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Data Sheet
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Key Features
- Charge from USB or AC Adapter
- Automatic Switchover when AC Adapter is Plugged In
- On-Chip Thermal Limiting Simplifies Board Design
- Charge Status Indicator
- 5-Pin Thin SOT23 Package
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Applications/Uses
- Cell Phones
- Digital Cameras
- PDAs
- Wireless Appliances
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Key Specifications:
| Battery Chargers |
| Part Number |
Cell Chemistry |
Lithium Ion Cells |
Protected VIN
(V) |
Charging VIN
(V) |
Charge Rate Set by |
Max. ICHG
(A) |
Charge Termination |
Charge Regulation |
EV Kit |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max |
max |
≥ |
max w/pins |
See Notes |
| MAX1551 |
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1 |
7 |
7 |
Preset |
0.28 |
External Control |
Linear |
No |
-40 to +85 |
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8.3 |
$0.85 @1k |
| MAX1555 |
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$0.85 @1k |
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See All Battery Chargers (68)
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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
Application Notes
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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| MAX1551EZK+
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Active |
TSOT;5 pin;8.3 mm²
Outline Drawing:21-0113 (PDF)
Land Pattern: 90-0241 (PDF)
Use pkgcode/variation: Z5+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1551EZK+T
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Active |
TSOT;5 pin;8.3 mm²
Outline Drawing:21-0113 (PDF)
Land Pattern: 90-0241 (PDF)
Use pkgcode/variation: Z5+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1551EZK-T
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Active |
TSOT;5 pin;8.3 mm²
Outline Drawing:21-0113 (PDF)
Land Pattern: 90-0241 (PDF)
Use pkgcode/variation: Z5-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1555EZK+
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Active |
TSOT;5 pin;8.3 mm²
Outline Drawing:21-0113 (PDF)
Land Pattern: 90-0241 (PDF)
Use pkgcode/variation: Z5+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1555EZK+T
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Active |
TSOT;5 pin;8.3 mm²
Outline Drawing:21-0113 (PDF)
Land Pattern: 90-0241 (PDF)
Use pkgcode/variation: Z5+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1555EZK-T
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Active |
TSOT;5 pin;8.3 mm²
Outline Drawing:21-0113 (PDF)
Land Pattern: 90-0241 (PDF)
Use pkgcode/variation: Z5-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
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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Similar Products by Function
| MAX1925, MAX1926 |
Switch-Mode 1-Cell Li+ Chargers |
| MAX1874 |
Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation |
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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2902
Rev 0;
2003-07-31
This page last modified: 2010-05-14
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