DC1007C Datasheet DC1007C | P1-P3

dc1007cf

DEMO MANUAL DC1007C

DESCRIPTION

LTC4088

High Efficiency Battery

Charger/Power Manager

Demonstration Circuit 1007 is a high efficiency USB power

manager with PowerPath™ control and Li-Ion/Polymer

battery charger featuring the LT C

4088. It includes a syn-

chronous switching input regulator, a full featured battery

charger and an ideal diode. Designed specifically for USB

applications, the LTC4088’s switching regulator automati

cally limits its input current to either 100mA, 500mA or

1A for wall-powered applications via logic control. There

are also 2.5mA and 500µA suspend modes to prevent the

battery from running down when the product is connected

to a suspended USB bus.

The switching input stage provides power to VOUT where

power sharing between the application circuit and the

battery charger is managed. Unlike linear PowerPath

controllers, the LTC4088’s switching input stage can use

nearly all of the 0.5W or 2.5W available from the USB port

with minimal power dissipation. This feature allows the

LTC4088 to provide more power to the application and

L, LT, LTC, LTM, Linear Technology, the Linear logo and PowerPath are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

PERFORMANCE SUMMARY

battery and eases thermal issues in space constrained

applications.

An ideal diode ensures that the system power is available

from the battery when the input current limit is reached or

if the USB or wall supply is removed. The optional external

P-channel MOSFET supplements the internal ideal diode

by reducing R

and increasing efficiency.

A CHRG LED indicates four possible states of the battery

charger. Charging is indicated when the LED is steady-ON.

Not charging is indicated by a steady-OFF. A NTC fault is

indicated by a slow blinking rate (1.5Hz) and a bad battery

is indicated by a fast blinking rate (6.1Hz).

The LTC4088 is available in the low profile 14-Lead

4mm × 3mm × 0.75mm DFN surface mount package.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1007C

Specifications are at T

= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

BUS

Input Voltage Range 4.35 5.5 V

OUT

Mode and Load Dependent 3.5 4.7 V

LDO3V3

3.3V Load and VOUT Dependent 3.3 V

BAT

Output Float Voltage (Constant Voltage Mode) 4.2 V

BAT

Output Charge Current (Constant Current Mode) R

PROG

Equals 2kΩ 0.5 A

dc1007cf

DEMO MANUAL DC1007C

QUICK START PROCEDURE

Demonstration circuit 1007 is best evaluated using a Li-

Ion/Polymer battery. When using a battery simulator for

evaluation, oscillations must be verified with a real battery

at the same conditions because it is difficult to match the

impedance of a real battery, which is required for battery

charger stability.

Refer to Figure 1 for the proper measurement and equip

ment setup and follow the procedure below.

1. If using an external supply, connect a 0V to 6V, 1.5A

supply with voltage adjusted to 0V between the VBUS

and GND terminals. Connect a voltmeter across the

VBUS and GND terminals. If using the USB input op

tion, have cable ready to plug in when all loads and

jumpers are set. Do not use the USB input and an

external supply at the same time.

2. Set JP1, NTC jumper to INT to use the demo board

resistor. To use an external NTC resistor, connect an

NTC resistor between J2 - J3 and the GND terminal.

Then set the NTC jumper to EXT.

3. Use Table 1 to set JP2, JP3, and JP4 (D0, D1, and D2

respectively) to select the desired input current limit

and charger status.

Table 1. Controlled Input Current Limit

D0 D1 D2 CHARGER I

LIM

0 0 0 ON 100mA (1×)

0 0 1 OFF 100mA (1×)

0 1 0 ON 500mA (5×)

0 1 1 OFF 500mA (5×)

1 0 0 ON 1A (10×)

1 0 1 OFF 1A (10×)

1 1 0 OFF 500µA (SUSP)

1 1 1 OFF 2.5mA (SUSP)

4. Connect a 0mA to 25mA adjustable load in series

with an ammeter between the 3.3V and GND termi

nals. Connect a voltmeter between the 3.3V and GND

terminals.

5. Connect a 0A to 2A adjustable load in series with an

ammeter between the VOUT terminal and the GND

terminal. Connect a voltmeter between the VOUT and

GND terminals.

6. Connect a partially charged (~3.6V) lithium-ion bat

tery with the positive lead to the BAT terminal and the

negative lead to a GND terminal. Connect the positive

lead of a voltmeter to the BAT terminal and the nega

tive lead to the GND terminal. Connect the positive

terminal of a voltmeter to PROG and the negative

terminal to GND to measure the current ﬂowing into

the battery. The voltage on PROG will read 1V when

the maximum charge current is reached. The voltage

on CLPROG will read 1.188V when the input current

is reached. Observe VOUT and the 3.3V output.

BAT

PROG

•103

VBUS

BUSQ

CLPROG

• h

CLPROG

( )

See the data sheet for the proper values of I

BUSQ

and

CLPROG

in the 1×, 5× and 10× modes.

7. If using the USB input, plug in the USB cable and ob

serve the charge current, VOUT, and the 3.3V output.

If using an external power supply, slowly increase the

supply and observe that the LTC4088 starts to use

the VBUS input power as the VBUS reaches 4.35V.

dc1007cf

DEMO MANUAL DC1007C

QUICK START PROCEDURE

8. Discharge the battery to 2.5V. If charger mode is on,

observe it is charging in trickle charge mode and

the charge current is 50mA. As the battery voltage

increases above 2.85V observe that the charger goes

into full constant current mode. Observe that VOUT

stays above 3.6V when the input current limit is not

exceeded. Remove the NTC jumper on JP2. Observe

the CHRG LED slow blinking rate. Also observe the

35KHz pulse with varying duty cycle between 4.7%

and 95.3% on the CHRG terminal with an oscilloscope.

Reinstall the NTC jumper.

9. Increase the VOUT load and observe when the input

current starts to limit (V

CLPROG

= 1.188V). When input

current limit is reached, VOUT drops from 300mV

above the BAT voltage to 15mV below the BAT volt-

age and the additional load transitions to the battery

through the ideal diode. Due to the high efﬁciency of

the switching regulator, the charge and load current

may be signiﬁcantly above the input current depending

on the voltage on the BAT pin.

10. Repeat step 9 with different current limit modes.

11. Set the VBUS input supply to 5V. Observe the battery

current as the battery voltage increases above 4.1V.

The charge current starts to

decrease as the battery

voltage increases towards 4.2V.

See the latest LTC4088 data sheet for more information

on how this part performs.

P1-P3 P4-P6 P7-P8

DC1007C

Mfr. #:

Buy DC1007C

Manufacturer:

Analog Devices / Linear Technology

Description:

Power Management IC Development Tools LTC4088EDE Demo Board

Lifecycle:

New from this manufacturer.

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