ACT4503YH-T Просмотр технического описания (PDF) - Unspecified

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ACT4503YH-T

High Power DC-DC Converter Products

Unspecified 

Input Voltage

4.5-5.5V

ACT2802 5V/2.1A Smart Power Bank

Output Voltage

5.0V

Charge Current

2A

Boost Output

2.5A

Efficiency

92%@2.1A@VBAT=4.1V

Topology

Buck/Boost

L=46.4mm

W=21.2mm

Design Features

 Dedicated Single Chip Solution for Mobile Power

 Programmable up to 5V/3.0A Input Current

 Programmable up to 5V/2.1A Output Current

 Programmable up to 3.0A Switching Charge Current

 Pogrammable 4.1V to 4.35V Battery Voltage

 Prioritized Power Path from Input to Output

 1.1MHz/0.55MHz Switching Frequencies

 4LEDs Battery Level and Status Indication

 <10µA Low Battery Leakage Current

 No Load Shutdown and Push Button Turn-on

 Battery Impedance Compensation

 Battery Over Current, Over Voltage, Over Temperature and

Short Circuit Protections

 Charge Current Foldback at 110°C Die Temperature

 IC Over Temperature Protection

Operation and Application

ACT2802 is a space-saving and high-performance low-

profile single-chip solution for backup battery pack and

standalone battery charger. ACT2802 integrates all the

functions that backup battery packs need, including

switching charger, Boost converter and LED indication.

ACT2802 operates at 1.1MHz for switching charger and

0.55MHz for Boost converter allowing tiny external in-

ductor and capacitors. ACT2802 provides a direct power

path from input to output with programmable current

limit while providing power to switching charger. Out-

put has higher priority than battery charger if the pro-

grammed input current limit is reached.

ACT2802 charges battery with full cycle of precondition-

ing, fast charge with constant current and constant volt-

age until end of charge. The battery charger is thermally

regulated at 110°C with charge current foldback.

ACT2802 Boost converter steps battery voltage up to

5V. Boost converter features high efficiency, constant

current regulation, short circuit protection and over

voltage protection.

ACT2802 provides 3.5mA constant currents to drive 4

LEDs to indicate battery level and charging status. Bat-

tery impedance is compensated at battery level indica-

tion.

Schematic

Boost Output V/I Profile

R12

R13

Input USB

+

D-

D+

-

R11

C12 C11

R10

D2

C3

PB

R1

HZ

PB

AGND

nPG

ILIM

VIN

R18

C8

+

D-

Q3

D+

-

R20

U2

Output USB

R15

R17

C4

R16

R14

ACT2802

C2

LED1

R5

BTV

R4

ICST

R3

IOST

CSN

CSP C6

C16

D1

L1

R9 R21

C7

R2A

R2

C5

C9

BAT

7

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