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MAX1737
Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller
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Status
Active: In Production.
Description
The MAX1737 is a switch-mode lithium-ion (Li+) battery
charger that charges one to four cells. It provides a
regulated charging current and a regulated voltage
with only a ±0.8% total voltage error at the battery terminals.
The external N-channel switch and synchronous
rectifier provide high efficiency over a wide input voltage
range. A built-in safety timer automatically terminates
charging once the adjustable time limit has been
reached.
The MAX1737 regulates the voltage set point and charging
current using two loops that work together to transition
smoothly between voltage and current regulation. An
additional control loop monitors the total current drawn
from the input source to prevent overload of the input
supply, allowing the use of a low-cost wall adapter.
The per-cell battery voltage regulation limit is set
between +4.0V and +4.4V and can be set from one to
four by pin strapping. Battery temperature is monitored
by an external thermistor to prevent charging if the battery
temperature is outside the acceptable range.
The MAX1737 is available in a space-saving 28-pin
QSOP package. Use the evaluation kit (MAX1737EVKIT)
to help reduce design time.
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Data Sheet
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An evaluation kit is available: MAX1737EVKIT
Key Features
- Stand-Alone Charger for Up to Four Li+ Cells
- ±0.8% Accurate Battery Regulation Voltage
- Low Dropout: 98% Duty Cycle
- Safely Precharges Near-Dead Cells
- Continuous Voltage and Temperature Monitoring
- < 1µA Shutdown Battery Current
- Input Voltage Up to +28V
- Safety Timer Prevents Overcharging
- Input Current Limiting
- Space-Saving 28-Pin QSOP
- 300kHz PWM Oscillator Reduces Noise
- 90% Conversion Efficiency
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Applications/Uses
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Li+ Battery Packs
- Notebook Computers
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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 |
| MAX1737 |
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28 |
28 |
Resistor |
4 |
Timer |
Switchmode |
Yes |
-40 to +85 |
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61.9 |
$2.86 @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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| MAX1737EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1737EEI+
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1737EEI+T
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1737EEI-T
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Active |
QSOP;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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Similar Products by Function
| MAX745 |
Switch-Mode Lithium-Ion Battery-Charger |
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Didn't Find What You Need?
Information Index
Document Ref.: 19-1793
Rev 4;
2007-09-14
This page last modified: 2009-09-25
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