Datasheet > RT6211B

RT6211B

更新时间： 2024-02-04 19:18:25

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
16页	989K
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RT6211B 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	18	Number of Outputs：	1
Vout (min) (V)：	0.8	Vout (max) (V)：	6.5
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	1.5	Current Limit (typ) (A)：	2.5
Freq (typ) (kHz)：	520	Freq (min) (kHz)：
Freq (max) (kHz)：		Ext Sync：	No
Ron_HS (typ) (mOhm)：	230	Ron_LS (typ) (mOhm)：	130
Iq (typ) (mA)：	0.8	Features：	ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;SCP;Stable with Ceramic Capacitor;UVP
Package Type：	SOT-26

RT6211B 数据手册

RT6211A/B

operation. For continuous operation, provide adequate

cooling so that the junction temperature does not

exceed 150C.

Shut-Down, Start-Up and Enable (EN)

The enable input (EN) has a logic-low level. When V_EN

is below this level the IC enters shutdown mode and

supply current drops to less than 6A. When V_EN

exceeds its logic-high level the IC is fully operational.

Output Under-Voltage Protection and Hiccup Mode

The RT6211A/B includes output under-voltage

protection (UVP) against over-load or short-circuited

condition by constantly monitoring the feedback

voltage V_FB. If V_FBdrops below the under-voltage

protection trip threshold (typically 50% of the internal

feedback reference voltage), the UV comparator will go

high to turn off both the internal high-side and low-side

MOSFET switches.

External Bootstrap Capacitor

Connect a 0.1F low ESR ceramic capacitor between

BOOT and LX. This bootstrap capacitor provides the

gate driver supply voltage for the high side N-channel

MOSFET switch.

Soft-Start (SS)

The RT6211A/B provides an internal soft-start feature

for inrush control. At power up, the internal capacitor is

charged by an internal current source I_SSto generate a

soft-start ramp voltage as a reference voltage to the

PWM comparator. The device will initiate switching and

the output voltage will smoothly ramp up to its targeted

regulation voltage only after this ramp voltage is

greater than the feedback voltage V_FBto ensure the

converters have a smooth start-up. The output voltage

starts to rise in 70s from EN rising, and the soft-start

ramp-up time (V_FBfrom 0V to 0.8V) is 0.85ms.

If the output under-voltage condition continues for a

period of time, the RT6211A/B will enter output

under-voltage protection with hiccup mode. During

hiccup mode, the IC will shut down for t_{HICCUP_OFF}

(3.6ms), and then attempt to recover automatically for

t_{HICCUP_ON}(1.2ms). Upon completion of the soft-start

sequence, if the fault condition is removed, the

converter will resume normal operation; otherwise,

such cycle for auto-recovery will be repeated until the

fault condition is cleared. Hiccup mode allows the

circuit to operate safely with low input current and

power dissipation, and then resume normal operation

as soon as the over-load or short-circuit condition is

removed.

= 12V

VIN

850μs

70μs

VOUT

Resume normal

operation

HICCUP_ON

Abnormal case

detected (UV)

1.2ms

Fault condition

HICCUP_OFF

VOUT

removed

3.6ms

Over-Temperature Protection

0.85ms

The RT6211A/B includes an over-temperature

protection (OTP) circuitry to prevent overheating due to

excessive power dissipation. The OTP will shut down

switching operation when the junction temperature

exceeds 150C. Once the junction temperature cools

down by approximately 20C the IC will resume normal

is a registered trademark of Richtek Technology Corporation.

DS6211A/B-07 September 2018

www.richtek.com

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