Datasheet > RT9535B

RT9535B

更新时间： 2024-01-21 11:55:44

品牌	Logo	应用领域
立锜 - RICHTEK		电池
页数	文件大小	规格书
18页	1432K
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技术参数
数据手册

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RT9535B 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	28	Battery Charge Voltage (max) (V)：	22
Battery Charge Current (max) (A)：	2	Input Source：	AC Adapter;USB
Features：	Adjustable Current Limit;Adjustable Soft-Start;Enable Input;OCP;UVP	Package Type：	WQFN4x4-24

RT9535B 数据手册

RT9535B

Operation

The RT9535B is a current mode PWM step-down

switching charger controller. The battery DC charge

current is programmed by a resistor R4 at the ISET pin

and the ratio of sense resistor RS2 over RS1 in the

typical application circuit. Amplifier CA converts the

charge current through RS1 to a much lower sampled

CL Amplifier

The amplifier CL monitors and limits the input current,

normally from the AC adapter, to a preset level (100mV

/ RS4). At input current limit, CL will supply the

programming current at ISET pin, thus reducing battery

charging current.

current I_CHG(I_CHG= I_BATTx RS1 / RS2) fed into the

ISET pin. Amplifier EA compares the output of CA with

2.5V reference voltage and drives the PWM loop to

force them to be equal. Note that ICHG has both AC

and DC components. High DC accuracy is achieved

with averaging filter R3 and C3 at ISET pin. I_CHGis

mirrored to go through R4 and generates a ramp signal

that is fed to the PWM control comparator, forming the

current mode inner loop. An internal LDO generates a

5V to power topside FET gate driver. For batteries like

lithium that require both constant current and constant

voltage charging, the 0.5% 2.5V reference and the

voltage amplifier VA reduce the charge current when

battery voltage reaches the normal charge voltage level.

For NiMH and NiCd, VA can be used for over voltage

protection.

Charge STATUS

When the charger is in voltage mode and the charge

current level is reduced to 17%, STATUS pin will turn to

logic high. This charge completion signal can be used

to start a timer for charge termination. A 0.1F

capacitor from STATUS to ground is needed to filter the

sampled charging current ripple.

ACDRV Driver

The ACDRV pin drives an external P-MOSFET to avoid

reverse current from battery to input supply. When

input supply is removed, the RT9535B goes into a low

current, 10A maximum, sleep mode as VIN drops

below the battery voltage.

is a registered trademark of Richtek Technology Corporation.

DS9535B-04 February 2016

www.richtek.com

1 2 3 456 7 8...18

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