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JIATAIMU - System Power PWM Controller

Numéro de référence JTMT8823
Description System Power PWM Controller
Fabricant JIATAIMU 
Logo JIATAIMU 





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JTMT8823 fiche technique
JTMT8823
System Power PWM Controller with Economy Standby Mode
Features
Simplified Application Circuit
 Wide Input voltage Range from 5.5V to 25V
VIN
 Provide 5 Independent Outputs with ±1.0% Accu- 5.5V~25V
EN1
EN2
racy Over-Temperature
VLDO5
- PWM1 Controller with Adjustable (2V to 5.5V) Out- VOUT1
put
- PWM2 Controller with Adjustable (2V to 5.5V) Out-
put
Q1
L1
Q2
LDO5 LDO3
PWM1 PWM2
Charge Pump
- 100mA Low Dropout Regulator (LDO5) with Fixed
5V Output
C1 D2
D3 C3
Q3
L2
VLDO3
VOUT2
Q4
D4 VCP
- 100mA Low Dropout Regulator (LDO3) with Fixed
3.3V Output
D1 C2
- 250kHz Clock Signal for 15V Charge Pump (Used General Description
C4
PWM1 as Its Power Supply)
The JTMT8823 integrates dual step-down, constant-on-
 Excellent Line/Load Regulations about±1.5% over time, synchronous PWM controllers (that drives dual N-
temperature range at PWM Channels
channel MOSFETs for each channel) and two low drop-
 Low Consumption in Standby Mode
out regulators as well as various protections into a chip.
 2Cells Input Battery Support
The PWM controllers step down high voltage of a battery
 Built in POR Control Scheme Implemented
to generate low-voltage for NB applications. The output
 Constant On-Time Control Scheme
of PWM1 and PWM2 can be adjusted from 2V to 5.5V by
 Built in Soft Start for PWM Outputs and Soft Stop setting a resistive voltage-divider from VOUTx to GND.
for PWM Outputs and LDO Outputs
The linear regulators provide 5V and 3.3V output for
 Integrated Bootstrap Forward P-CH MOSFET
standby power supply. The linear regulators provide up
 High Efficiency over Light to Full Load Range
to 100mA output current. When the PWMx output voltage
(PWMs)
is higher than LDOx bypass threshold, the related LDOx
 Built in Power Good Indicators (PWMs)
regulator is shut off and its output is connected to VOUTx
 60% Under-Voltage and 115% Over-Voltage Protec- by internal switchover MOSFET. It can save power
tions (PWM)
dissipation. The charge pump circuit with 250kHz clock
 Adjustable Current-Limit Protection (PWMs)
driver uses VOUT1 as its power supply to generate ap-
- Using Sense Low-Side MOSFET’s RDS(ON)
 Over-Temperature Protection
proximately 15V DC voltage.
The JTMT8823 provides excellent transient response
 3mmx3mm Thin QFN-20 (TQFN3x3-20) package and accurate DC output voltage in either PFM or PWM
 Lead Free and Green Device Available (RoHS
Mode. In Pulse-Frequency Mode (PFM), the JTMT8823
Compliant)
provides very high efficiency over light to heavy loads
with loading-modulated switching frequencies. The
Forced-PWM Mode works nearly at constant frequency
for low-noise requirements. The unique ultrasonic
mode maintains the switching frequency above 25kHz,
which eliminates noise in audio application.
JIATAIMU reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright JIATAIMU Electronics Corp.
Rev. P.1 - Nov., 2013
1
www.jtmic.com

PagesPages 25
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