2A, 6V, 1.5MHz, 25μA I_Q, ACOT® Synchronous Step-Down Converter

RT5785A/RT5785B

The RT5785A/B is a high-performance, Advanced Constant On-Time (ACOT^TM) monolithic synchronous step-down DC-DC converter that can deliver up to 2A output current from a 2.5V to 6V input supply. The proprietary ACOT control architecture features quick transient response and provides stable operation with small ceramic output capacitors and without complicated external compensation. The switching ripple voltage is easily smoothed_out by small package filtering elements due to a constant switching frequency of 1.5MHz and the maximum duty cycle of 100% allows the device to operate at low dropout use. With internal low on-resistance power switches and extremely low quiescent current, the RT5785A/B displays excellent efficiency and good behavior across a range of applications. Cycle-by-cycle current limit provides protection against shorted outputs, input under-voltage lock-out, output under-voltage protection, and thermal shutdown provide safe and smooth operation in all operating conditions. The RT5785A/B is available in the TSOT-23-8 (FC) package.

Applications

Mobile Phones and Handheld Devices
STB, Cable Modem, and xDSL Platforms
WLAN ASIC Power / Storage (SSD and HDD)
General Purpose for POL LV Buck Converter

Key Spec.

	RT5785A	RT5785B
Status	Active	Active
Vin (min) (V)	2.5	2.5
Vin (max) (V)	6	6
Number of Outputs	1	1
Vout (min) (V)	0.6	0.6
Vout (max) (V)	6	6
Output Adj. Method	Resistor	Resistor
Iout (max) (A)	2	2
Current Limit (typ) (A)	2.5	2.5
Freq (typ) (kHz)	1500	1500
Ext Sync	No	No
Ron_HS (typ) (mOhm)	100	100
Ron_LS (typ) (mOhm)	60	60
Iq (typ) (mA)	0.025	0.6
Features	100% Duty Cycle;ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP	100% Duty Cycle;ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type	TSOT-28(FC)	TSOT-28(FC)