Dual 800mA, 1.25MHz Synchronous Step-Down Converter


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The RT8035 is a high-efficiency Pulse-Width-Modulated (PWM) dual step-down DC/DC converter. Capable of delivering up to 800mA output current over a wide input voltage range from 2.5V to 5.5V, the RT8035 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs, PC WLAN card and hand-held devices.
Three operating modes are available including : PWM mode, Low-Dropout Mode and shut-down mode. The Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8035 enters Low-Dropout mode when normdal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. The RT8035 enters shut-down mode and consumes less than 0.1μA when the EN pin is pulled low.
The switching ripple is easily smoothed-out by small package filtering elements due to the fixed operating frequency of 1.25MHz. The RT8035 is available in the WDFN-10L 3x3 package.


  • Portable Instruments
  • Microprocessors and DSP Core Supplies
  • Cellular Phones
  • Wireless and DSL Modems
  • PC Cards
Key Spec.
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Number of Outputs 2
Vout (min) (V) 0.6
Vout (max) (V) 5.5
Output Adj. Method Resistor
Iout (max) (A) 0.8
Current Limit (typ) (A) 1.5
Freq (typ) (kHz) 1250
Freq (min) (kHz) 1000
Freq (max) (kHz) 1500
Ext Sync No
Ron_HS (typ) (mOhm) 250
Ron_LS (typ) (mOhm) 260
Iq (typ) (mA) 0.07
Features 100% Duty Cycle;Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;Stable with Ceramic Capacitor
Package Type WDFN3x3-10
  • 2.5V to 5.5V Input Range
  • 800mA Output Current
  • 1.25MHz Fixed-Frequency PWM Operation
  • 95% Efficiency
  • No Schottky Diode Required
  • 0.6V Reference Allows Low Output Voltage
  • Low Dropout Operation : 100% Duty Cycle
  • Small 10-Lead WDFN Package
  • RoHS Compliant and Halogen Free
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Dual 800mA, 1.25MHz Synchronous Step-Down Converter2009/06/05
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Dual 800mA, 1.25MHz Synchronous Step-Down Converter 2015/05/19
Technical Documents
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Richtek Selection Guide [Oct., 2020]2020/12/30
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How to estimate control loop bandwidth from the transient response time?2017/03/30 1378
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8035GQWWDFN3x3-101500 Not available Buy from Distributor