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TPS40090QPWRQ1

Automotive 4.5V to 15V Multiphase Synchronous Buck Controller

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

TPS40090QPWRQ1
Datasheet:

TPS40090QPWRQ1 Datasheet (PDF)
Vin (min) (V):

4.5
Vin (max) (V):

15
Vout (min) (V):

0.7
Vout (max) (V):

3.3
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TPS40090QPWRQ1 General Description

The TPS40090 is a two-, three-, or four-phase programmable synchronous buck controller that is optimized for low-voltage, high-current applications powered by a 5-V to 15-V distributed supply. A multi-phase converter offers several advantages over a single power stage including lower current ripple on the input and output capacitors, faster transient response to load steps, improved power handling capabilities, and higher system efficiency.

Each phase can be operated at a switching frequency up to 1-MHz, resulting in an effective ripple frequency of up to 4-MHz at the input and the output in a four-phase application. A two-phase design operates 180° out of phase, a three-phase design operates 120° out of phase, and a four-phase design operates 90° out of phase, as shown in Figure 1.

The number of phases is programmed by connecting the deactivated phase PWM output to the output of the internal 5-V LDO. In two-phase operation the even phase outputs should be deactivated.

The TPS40090 uses fixed frequency, peak current mode control with forced phase current balancing. When compared to voltage mode control, current mode results in a simplified feedback network and reduced input line sensitivity. Phase current is sensed by using either current sense resistors installed in series with output inductors or, for improved efficiency, by using the DCR (direct current resistance) of the filter inductors. The latter method involves generation of a current proportional signal with an R-C circuit (shown in Figure 11).

The R-C values are selected by matching the time constants of the R-C circuit and the inductor; R-C = L/DCR. With either current sense method, the current signal is amplified and superimposed on the amplified voltage error signal to provide current mode PWM control.

An output voltage droop can be programmed to improve the transient window and reduce size of the output filter. Other features include a single voltage operation, a true differential sense amplifier, a programmable current limit, soft-start, and a power good indicator.

Key Features

Qualified for Automotive Applications
Two-, Three-, or Four-Phase Operation
5-V to 15-V Operating Range
Programmable Switching Frequency Up to 1-MHz/Phase
Current Mode Control With Forced Current Sharing⁽¹⁾
1% Internal 0.7-V Reference
Resistive Divider Set Output Voltage
True Remote Sensing Differential Amplifier
Resistive or DCR Current Sensing
Current Sense Fault Protection
Programmable Load Line
Compatible with UCC37222 Predictive Gate Drive™ Technology Drivers
24-Pin Space-Saving TSSOP Package
Binary Outputs
APPLICATIONS
- Internet Servers
- Network Equipment
- Telecommunications Equipment
- DC Power Distributed Systems

⁽¹⁾ Patent pending
Predictive Gate Drive is a trademark of Texas Instruments.

Specifications

Vin (min) (V)	4.5	Vin (max) (V)	15
Vout (min) (V)	0.7	Vout (max) (V)	3.3
Iout (max) (A)	120	Iq (typ) (mA)	4
Switching frequency (min) (kHz)	100	Switching frequency (max) (kHz)	1000
Features	Adjustable current limit, Enable, Frequency synchronization, Phase Interleaving, Power good, Synchronous Rectification	Operating temperature range (°C)	-40 to 125
Regulated outputs (#)	1	Number of phases	4
Rating	Automotive	Control mode	current mode
Type	Controller	feature-topology	Step Down
feature-number-of-outputs	5	feature-output-voltage-v	-0.3 to 6
feature-minimum-output-current-a		feature-maximum-output-current-a	120
feature-minimum-input-voltage-v	4.5	feature-maximum-switching-frequency-khz	1000
feature-maximum-input-voltage-v	15	feature-operating-supply-voltage-v	4.5 to 15
feature-maximum-supply-current-ma		feature-maximum-power-dissipation-mw
feature-minimum-switching-frequency-khz		feature-synchronous-rectifier
feature-synchronous-clock		feature-packaging	Tape and Reel
feature-rad-hard		feature-pin-count	24
feature-cecc-qualified	No	feature-esd-protection
feature-military	No	feature-aec-qualified	Yes
feature-aec-qualified-number	AEC-Q100	feature-auto-motive	Yes
feature-p-pap	Yes	feature-eccn-code	EAR99
feature-svhc	Yes	feature-svhc-exceeds-threshold	No