LTC4095EDC 查看數據表（PDF） - Linear Technology

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LTC4095EDC

Standalone USB Li-Ion/Polymer Battery Charger in 2mm × 2mm DFN

Linear Technology 

LTC4095

SIMPLIFIED BLOCK DIAGRAM

2.25MHz CLOCK

COUNTER

4.105V

BAT

2.9V

+

RECHRG

–

–

TRICKLE

+

NTC

6

NTC

3 CHRG

M1

RECHARGE

CONTROL

LOGIC

TRICKLE

CHARGE

TEMP FAULT

TERMINATE

CHARGE

C/10

CHRGR BAD

ON

BAT

TEMP

FAULT

BLINK

LOGIC

5

8

HPWR

IN

TREF TDIE

THERMAL

AMP

CHARGE

CURRENT

CONTROL

100mV

IN

IBAT

800

IBAT

CONSTANT CURRENT/

CONSTANT VOLTAGE

ENABLE

DUVLO

UVLO

BAT

1

BAT

IN

4V

PROG

GND

7

2

SUSP

4

4095 F01

Figure 1. LTC4095 Block Diagram

OPERATION

Introduction

The LTC4095 is a linear battery charger designed to

charge single-cell lithium-ion batteries. The charger uses

a constant-current/constant-voltage charge algorithm

with a charge current programmable up to 950mA. Ad-

ditional features include automatic recharge, an internal

termination timer, low-battery trickle charge conditioning,

bad-battery detection, and a thermistor sensor input for

out of temperature charge pausing.

Futhermore, the LTC4095 is capable of operating from a

USB power source. In this application, charge current can

be programmed to a maximum of 100mA or 500mA per

USB power specifications.

Input Current vs Charge Current

The LTC4095 regulates the total current delivered to the

BAT pin; this is the charge current. To calculate the total

input current (i.e., the total current drawn from the IN pin),

it is necessary to sum the battery charge current, charger

quiescent current and PROG pin current.

Undervoltage Lockout (UVLO)

The undervoltage lockout circuit monitors the input volt-

age (IN) and disables the battery charger until IN rises

above VUVLO (typically 4V). 200mV of hysteresis prevents

oscillations around the trip point. In addition, a differential

undervoltage lockout circuit disables the battery charger

when IN falls to within VDUVLO (typically 40mV) of the

BAT voltage.

Suspend Mode

The LTC4095 can also be disabled by pulling the SUSP

pin above 1.2V. In suspend mode, the battery drain cur-

rent is reduced to 1.3µA and the input current is reduced

to 8.5µA.

4095fa

7

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