FAN53526UC168X datasheet(11/22 Pages) ONSEMI

Part #	FAN53526UC168X

Description	3.0 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator

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Manufacturer	ONSEMI [ON Semiconductor]

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FAN53526

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11

TYPICAL CHARACTERISTICS (continued)

(Unless otherwise specified, Auto PFM/PWM Mode, VIN = 3.6 V, VOUT = 1.15625V, VSEL = EN = VIN, TA = 25°C; circuit and components

according to Figure 1 and Table 2. Efficiency test conditions; ILOAD: 1 mA to 3 A, L = 330 nH, DFE201612E−R33N (Toko). CIN = 4.7 mF,

0603, C1608X5R1A475K (TDK), COUT x 2 = 2X47 mF, 0603, GRM188R60J476ME (Murata).)

IOUT (9500mA/div)

0mA

500mA

VOUT (10mV/div)

0.6V offset

618mV

+ 16mV

− 16mV

582mV

Figure 17. Load Transient, 3.8 VIN, 0.6 VOUT, 0−500

mA, 100 ns Edge, 47 mF COUT

Operating Description

The FAN53526 is a step−down switching voltage

regulator that delivers a programmable output voltage from

an input voltage supply of 2.5 V to 5.5 V. Using a proprietary

architecture with synchronous rectification, the FAN53526

is capable of delivering 3.0 A at over 80% efficiency. The

regulator operates at a nominal frequency of 2.4 MHz at full

load, which reduces the value of the external components to

330 nH or 470 nH for the output inductor and 44

μF for the

output capacitor. High efficiency is maintained at light load

with single−pulse PFM.

An I2C−compatible interface allows transfers up to

3.4 Mbps. This communication interface can be used to:

• Dynamically re−program the output voltage in 6.25 mV

increments;

• Reprogram the mode to enable or disable PFM;

• Control voltage transition slew rate; or

• Enable / disable the regulator.

Control Scheme

The FAN53526 uses a proprietary non−linear,

fixed−frequency PWM modulator to deliver a fast load

transient response, while maintaining a constant switching

frequency over a wide range of operating conditions. The

regulator performance is independent of the output

capacitor ESR, allowing for the use of ceramic output

capacitors. Although this type of operation normally results

in a switching frequency that varies with input voltage and

load current, an internal frequency loop holds the switching

frequency constant over a large range of input voltages and

load currents.

For very light loads, the FAN53526 operates in

Discontinuous Current Mode (DCM) single−pulse PFM,

which produces low output ripple compared with other PFM

architectures. Transition between PWM and PFM is

relatively seamless, providing a smooth transition between

DCM and CCM Modes.

PFM can be disabled by programming the MODE bits in

the CONTROL register in combination with the state of the

VSEL pin

. See table in the Control Register, 02h.

Enable and Soft−Start

When the EN pin is LOW; the IC is shut down, all internal

circuits are off, and the part draws very little current. In this

state, I2C can be written to or read from as long as input

voltage is above the UVLO. The registers keep the content

when the EN pin is LOW. The registers are reset to default

values during a Power On Reset (POR). When the

OUTPUT_DISCHARGE bit in the Control register is

enabled (logic HIGH) and the EN pin is LOW or the

BUCK_ENx bit is LOW, an 11 W load is connected from

VOUT to GND to discharge the output capacitors.

Raising EN while the BUCK_ENx bit is HIGH activates

the part and begins the soft−start cycle. During soft−start, the

modulator’s internal reference is ramped slowly to minimize

surge currents on the input and prevent overshoot of the

output voltage. Synchronous rectification is inhibited,

allowing the IC to start into a pre−charged capacitive load.

If large values of output capacitance are used, the

regulator may fail to start. The maximum COUT capacitance

for starting with a heavy constant−current load is

approximately:

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