Dual-Synchronous Buck Controllers for Point-of-

Load, Tracking, and DDR Memory Power Supplies

2

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ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

V+ to GND ..............................................................-0.3V to +25V

AVL, VL to GND........................................................-0.3V to +6V

PGND to GND .......................................................-0.3V to +0.3V

FB_, EN_, POK_ to GND...........................................-0.3V to +6V

REFIN, VTTR, FREQ, SS_, COMP_ to GND....-0.3V to (AVL + 0.3V)

BST_, ILIM_ to GND ...............................................-0.3V to +30V

DH1 to LX1 ...............................................-0.3V to (BST1 + 0.3V)

DH2 to LX2 ...............................................-0.3V to (BST2 + 0.3V)

LX_ to BST_ ..............................................................-6V to +0.3V

LX_ to GND................................................................-2V to +25V

DL_ to PGND ................................................-0.3V to (VL + 0.3V)

28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) ..........................……+300°C

ELECTRICAL CHARACTERISTICS

otherwise noted.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

V+ Operating Range

VL regulator drops out below 5.5V (Note 1)

4.5

23.0

V

V+/ VL Operating Range

VL is externally generated (Note 1)

4.5

5.5

V

V+ Operating Supply Current

IL(VL) = 0, FB_ forced 50mV above threshold

3.5

7

mA

V+ Standby Supply Current

IL(VL) = 0, BST_ = VL, EN = LX_ = FB_ = 0V

350

700

µA

VL REGULATOR

Output Voltage

4.75

5

5.25

V

VL Undervoltage-Lockout Trip

Level

Rising edge, hysteresis = 550mV (typ) (trip level is

typically 85% of VL)

4.18

4.3

4.42

V

Output Current

This is for gate current of DL_ /DH_ drivers, C(VL) =

1µF/10mA ceramic capacitor

70

mA

Thermal Shutdown

Rising temperature, typical hysteresis = 10°C

+160

°C

CURRENT-LIMIT THRESHOLD (all current limits are tested at V+ = VL = 4.5V and 5.5V)

ILIM Sink Current

ILIM_ = LX - 200mV, 1.8V < LX < 23V, BST = LX +5V

180

200

220

µA

SOFT-START

Soft-Start Source Current

SS_ = 100mV

-7

-5

-3

µA

Soft-Start Sink Current

SS_ = 0.8 or REFIN

3

5

7

µA

Soft-Start Full-Scale Voltage

0.8 or

REFIN

V

FREQUENCY

Low End of Range

160

200

240

kHz

Intermediate Range

800

1000

1200

kHz

High End of Range

1120

1400

1680

kHz

95

80

Maximum Duty Cycle

72

%