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RT5800

更新时间： 2024-01-08 21:07:59
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立锜 - RICHTEK /
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RT5800 技术参数

Status：ActiveVin (min) (V)：3
Vin (max) (V)：6Number of Outputs：3
Vout (min) (V)：0.3Vout (max) (V)：1.85
Preset Vout (V)：Output Adj. Method：Digital
Iout (max) (A)：5.5Current Limit (typ) (A)：7
Freq (typ) (kHz)：2100Freq (min) (kHz)：1850
Freq (max) (kHz)：2500Ext Sync：No
Ron_HS (typ) (mOhm)：25Ron_LS (typ) (mOhm)：15
Iq (typ) (mA)：0.07Features：ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OTP;OVP;SCP;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type：WQFN4.5x5-30(FC)

RT5800 数据手册

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RT5800  
Operation  
let DVS0 be used and pull VSELA low to let DVS1 be  
used. Conversely, when setting 0x52[2]=1, pull VSELA  
high to let DVS1 be used and pull VSELA low to let  
DVS0 be used.  
The RT5800 is a power management IC that integrates  
four high efficiency Buck converters, and is factory  
configured as a 2/1/1 phase converter. Each of the four  
converters provides up to 5A output current over an  
input supply voltage range of 3.3V to 6V.  
The RT5800 also supports DVS speed configuration,  
whether the slew rate of voltage changing in the same  
DVSx or between DVS0 and DVS1. Take Buck1 as  
two-phase configuration for an example, when output  
voltage is set from low to high or high to low, register  
0x54[6:4] defines slew rate of DVS up while 0x54[2:0]  
is used to define slew rate of DVS down. In order to  
have better performance during voltage changing  
operation, the master/slave enters PWM operation and  
keeps 200s after the voltage achieves target even  
when IC is set to Auto mode. Figure 1 and Figure 2  
show the DVS up and down operation.  
The RT5800 utilizes the proprietary Advanced Constant  
On-Time (ACOTTM) control architecture. The ultrafast  
ACOTTM control enables the use of small ceramic  
capacitors (MLCC) to save the PCB size.  
During normal operation, the internal high-side power  
switch (HSFET) is turned on for a fixed interval  
determined by a one-shot timer at the beginning of each  
clock cycle. When the HSFET is turned off, the internal  
low-side power switch (LSFET) is turned on. The output  
voltage is sensed remotely at VOUTx and RTNx for high  
accuracy and is compared to an internal reference  
voltage. Hence, the error signal is obtained and  
internally compensated. The compensated error signal  
is then compared to an internal ramp signal. When the  
minimum off-time one-shot (100ns, max.) has timed out  
and the inductor current is below the current limit  
threshold, the one-shot is triggered again if the internal  
ramp signal falls below the compensated error signal.  
The ACOTTM control architecture features ultrafast  
transient response. When a load is suddenly increased,  
the output voltage drops quickly. and triggers a new  
on-time to rise inductor current again.  
95%  
Target Voltage  
VOUT  
Intial Voltage  
5%  
Master  
Switch  
Slave  
Switch  
DVS Up Slew Rate  
Register Setting  
Command  
200μs  
Figure 1. DVS Up Operation  
95%  
Intial Voltage  
Dynamic Voltage Scaling (DVS)  
VOUT  
Target Voltage  
5%  
The RT5800 provides wide output voltage range with  
8-bits resolution and each Buck converter has two  
independently programmable voltage setting. They are  
called DVS0 and DVS1. Take Buck1 as two-phase  
configuration for an example, register 0x48[8:0] can set  
voltage of DVS0 while 0x4A[8:0] is used to set voltage  
of DVS1. There are two methods to select the DVS. For  
the first method, it can be changed by software from  
register 0x52[1:0]. Control DVS0 by setting  
0x52[1:0]=00 and DVS1 by setting 0x52[1:0]=01. For  
the second method, selecting the DVS can be from  
external hardware pin when setting 0x52[1:0]=10.  
VSELA pin can be this role and its polarity is defined by  
0x52[2]. When setting 0x52[2]=0, pull VSELA high to  
Master  
Switch  
Slave  
Switch  
DVS Down Slew Rate  
Register Setting  
Command  
200μs  
Figure 2. DVS Down Operation  
Copyright © 2019 Richtek Technology Corporation. All rights reserved.  
is a registered trademark of Richtek Technology Corporation.  
DS5800-00 November 2019  
www.richtek.com  
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