MCP73831T Single-Cell Li-Ion, Li-Polymer Charge Management Controllers

The MCP73831 devices are extremely sophisticated linear charge management controllers for use in situations with limited space and a tight budget. The MCP73831 devices are offered in a 5-Lead SOT-23 configuration. In addition to its tiny physical size, the MCP73831 is well suited for portable applications because of the low requirement for external components. The MCP73831 complies with all the requirements governing the USB power bus for applications charging from a USB port. The charge algorithm used by the MCP73831 is constant-current/constant voltage with configurable preconditioning and charge termination. To meet evolving battery charging needs, the constant voltage regulation is fixed with four options: 4.20V, 4.35V, 4.40V, or 4.50V. One external resistor is used to set the constant current value. The MCP73831 limits the charge current based on die temperature during high power or high ambient conditions. This thermal regulation optimizes the charge cycle time while maintaining device reliability.

 

MCP73831 Pinout Configuration

Pin Number	Pin Name	Description
1	STAT	Charge Status Output
2	VSS	Battery Management 0V Reference
3	VBAT	Battery Charge Control Output
4	VDD	Battery Management Input Supply
5	PROG	Current Regulation Set and Charge Control Enable

 

MCP73831T  Features

• Linear Charge Management Controller:
  • Integrated Pass Transistor
  • Integrated Current Sense
  • Reverse Discharge Protection
• High Accuracy Pre-set Voltage Regulation
• Four Voltage Regulation Options:
  • 4.20V, 4.35V, 4.40V, 4.50V
• Programmable Charge Current: 15 mA to 500 mA
• Selectable Preconditioning:
  • 10%, 20%, 40%, or Disable
• Selectable End-of-Charge Control:
  • 5%, 7.5%, 10%, or 20%
• Charge Status Output- Tri-State Output
• Automatic Power-Down
• Thermal Regulation
• Temperature Range: -40°C to +85°C
• Packaging: 5-Lead, SOT-23

Absolute Maximum Ratings

• VDD:  7.0V
• All Inputs and Outputs w.r.t. VSS: -0.3 to (VDD+0.3)V
• Maximum Junction Temperature, TJ: Internally Limited
• Storage temperature: -65°C to +150°C
• ESD protection on all pins:
  • Human Body Model (1.5kΩ in Series with 100pF): ≥ 4kV
  • Machine Model (200pF, No Series Resistance): 400V

 

Other Single Cell Chargers

TP5000, TP5100 module, TP4056

 

Note: Complete technical details can be found in the MCP73831 datasheet at this page’s end.

 

How To Use MCP73831?

The schematics below show the typical application diagram of an MCP73831. As mentioned earlier, it only requires a very minimal number of components that include the current programming resistor, status led, and filter capacitors.

Charge current can be set by placing a programming resistor in between the PROG VSS pins. The program resistor and the charge current are calculated using the following equation:

where R_PROG = kOhms and I_REG = mA

Functional Block Diagram

 

Applications

• Lithium-Ion/Lithium-Polymer Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• USB Chargers

 

DC Characteristics

Parameters	Sym	Min	Тур	Max	Units	Conditions
Supply Input
Supply Voltage	VDD	3.75		6	V
Supply Current	Iss		510	1500	μA	Charging
	53	200	μA	Charge Complete, No Battery
	25	50	μA	PROG Floating
	1	5	μA	VDD ≤ (VBAT-50 mV)
-	0.1	2	μA	VDD < VSTOP
UVLO Start Threshold	VSTART	3.3	3.45	3.6		VDD Low-to-High
UVLO Stop Threshold	VSTOP	3.2	3.38	3.5	V	VDD High-to-Low
UVLO Hysteresis	VHYS		70		mV
Voltage Regulation (Constant-Voltage Mode)
Regulated Output Voltage	VREG	4.168	4.2	4.232	V	MCP7383X-2
4.317	4.35	4.383	V	MCP7383X-3
4.367	4.4	4.433	V	MCP7383X-4
4.466	4.5	4.534	V	MCP7383X-5
				VDD = [VREG(typical) +1V] OUT = 10 MA TA = -5°C to +55°C
Line Regulation	(▲VBAT/ VBAT/▲VDD)		0.09	0.3	%/V	VDD = [VREG(typical) +1V] to 6V, lOUT = 10 mA
Load Regulation	▲VBAT/VBATI		0.05	0.3	%	OUT = 10 mA to 50 mA VDD = [VREG(typical) +1V]
Supply Ripple Attenuation	PSRR		52		dB	lOUT 10 mA, 10Hz to 1 kHz
	47		dB	OUT 10 mA, 10Hz to 10 kHz
	22		dB	OUT 10 mA, 10Hz to 1 MHz
Current Regulation (Fast Charge Constant-Current Mode)
Fast Charge Current Regulation	IREG	90	100	110	mA	PROG 10 KS2
450	505	550	mA	PROG= 2.0 KQ, Note 1
12.5	14.5	16.5	mA	PROG= 67 KQ
				TA = -5°C to +55°C

 

2D-Model and Dimensions