L5994 [STMICROELECTRONICS]

ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER; 可调节三重输出电源控制器


型号：	L5994
厂家：	ST
描述：	ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER 可调节三重输出电源控制器输出元件控制器
文件：	总8页 (文件大小：73K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

L5994

ADJUSTABLE TRIPLE OUTPUT

POWER SUPPLY CONTROLLER

PRODUCT PREVIEW

DUAL PWM BUCK CONTROLLERS

ADJUSTABLE

1.9V to 5V (Section 1)

1.66V to 3.5V (Section 2)

12V/120mALINEAR REGULATOR

DUAL SYNCH RECTIFIERS DRIVERS

96% EFFICIENCY ACHIEVABLE

TQFP32

50 A (@ 12V) STAND BY CONSUMPTION

ORDERING NUMBER: L5994

5.0V TO 25V SUPPLY VOLTAGE

EXCELLENTLOAD TRANSIENT RESPONSE

DISABLE PULSE SKIPPING FUNCTION

OUTPUT UNDERVOLTAGE SHUTDOWN

POWER MANAGEMENT:

- UNDER AND OVERVOLTAGEOUTPUT

DETECTION

- POWER GOOD SIGNAL

- SEPARATED DISABLE

THERMAL SHUTDOWN

Notebook computer and/or battery powered

equipment. The device produces regulated 1.8V,

2.5V (both adjustable)and 12V supplies for use in

portable and PCMCIA applications.

The internal architecture allows to operate with

minimum external components count. A very high

switching frequency (200/300 KHz or externally

synchronizable) optimizes their physical dimen-

sions.

PACKAGE: TQFP32

Synchronous rectification and pulse skipping

mode for the buck sections optimise the overall

efficiency over a wide load current range.

The two high performance PWM controllers for

1.8V and 2.5V lines are monitored for overvol-

tage, undervoltage and overcurrent conditions.

On detection of a fault, a POWER GOOD signal

is generated and a specific shutdown procedure

takes place to prevent physical damage and data

corruption.

APPLICATION

NOTEBOOK AND SUBNOTEBOOK COM-

PUTERS

PEN TOP AND PORTABLE EQUIPMENT

COMMUNICATING COMPUTERS

DESCRIPTION

The L5994 is a sophisticated dual PWM step-

down controller and power monitor intended for

A disable function allows to manage the output

power sections separately, optimising the quies-

cent consumptionof the IC in stand-by conditions.

SYSTEM BLOCK DIAGRAM

2.5V

POWER

SECTION

25V

1.8V

L5994

µP

SYNC

12V LDO

MEMORY

PERIPHERALS

5.1V LDO

POWER

MANAGEMENT

3.39V REF

& SYSTEM

SUPERVISOR

POWER GOOD

D98IN862

1/8

September 1999

This is preliminary information on a new product now in development. Details are subject to change without notice.

L5994

ABSOLUTE MAXIMUM RATINGS

Symbol

V_IN

V_I

I_IN

I_OUT

T_J

Parameter

Power Supply Voltage on V_IN

Value

0 to 25

Unit

Maximum Pin Voltage to Pins 1, 24, 25, 32

Input Current Except V13IN and V_IN

Output Current Digital Output

-0.5 to (V_IN+5)

-1 to +1

-15 to +15

-55 to 150

°C

Junction Temperature

THERMAL DATA

Symbol

Parameter

Thermal Resistance Junction -Ambient

Value

Unit

R_{TH J-amb}

°C/W

PIN CONNECTION (Topview)

32 31 30 29 28 27 26 25

H1STRAP

VIN

H2STRAP

PWROK2

REG12

V13IN

SREG5

V5SW

V1SNS

I1SNS

V2SNS

I2SNS

COMP1

SOFT1

COMP2

SOFT2

10 11 12 13 14 15 16

D98IN863A

BLOCK DIAGRAM

SOFT1

SOFT2

SLOPE

ERROR SUMMING

SOFT

ERROR SUMMING

SLOPE

I1SNS

V1SNS

COMP1

I2SNS

∑

V2SNS

COMP2

I1SNS

V1SNS V2SNS

I2SNS

OVER CURRENT

COMPARATOR

OVER CURRENT

COMPARATOR

VREF

H1STRAP

H1GATE

H1SRC

H2STRAP

H2GATE

H2SRC

Hside

ZERO CROSSING

COMPARATOR

ZERO CROSSING

COMPARATOR

Hside

CONTROL

LOGIC

CONTROL

LOGIC

REG5

Lside

PREG5

Lside

PULSE SKIPPING

COMPARATOR

PULSE SKIPPING

COMPARATOR

R1GATE

PREG5

R2GATE

PGND

13V UV Comp

V13IN

LINEAR

REGULATOR

W5SW

VIN

13V

OVERVOLT

COMPARATOR

UNDERVOLT

COMPARATOR

V5SW

4.7V

REG12

OSC

VREF

SREG5

VREF

SWITCH

COMPARATOR

REG12

LDO

POWER MANAGEMENT

SYSTEM SUPERVISOR

VREF BUFFER

OSCILLATOR

SYNCHRONIZATION

VREF

SGND

RUN2

D98IN864

RUN1 PWROK1 NOSKIP CRST PWROK2

2/8

L5994

PIN FUNCTIONS

Name

H1STRAP

V_IN

Description

Section 1 section bootstrap capacitor connection

Device supply voltage. From 5.0 to 25V

SREG5

V1SW

Signal 5V. It should be connected to PREG5 pin.

Alternative device supply voltage.

V1SNS

I1SNS

This pin connects to the (-) input of the section 1 internal current sense comparator

This pin connects to the (+) input of the section 1 internal current sense comparator

Feedback input for the section 1.

COMP1

SOFT1

Soft-start input of the section 1. The soft-start time is programmed by an external capacitor

connected between this pin and SGND. Approximately, 1ms/nF @ full load.

CRST

Input used for start-up and shut-down timing. A capacitor defines a time of 2ms/nF.

PWROK1

Power-good diagnostic signal. This output is driven high when section 1 is enabled and

running properly, after a delay defined by the CRST capacitor.

RUN1

VREF

Control input to enable/disable the section 1. A high level (>2.4V) enables this section, a low

level (<0.8V) shuts it down

Internal +2.5V high accuracy voltage generator. It can source 5mA to external load. Bypass to

ground with a 4.7µF capacitor to reduce noise.

SGND

NOSKIP

OSC

Signal ground. Reference for internal logic circuitry. It must be routed separately from high

current returns.

Pulse skipping mode control. A high level (>2.4V) disables pulse skipping at low load current,

a low level (<0.8V) enables it.

Oscillator frequency control: connect to 2.5V to select 300KHz operation, to ground or to 5V

for 200KHz operation. A proper external signal can synchronize the oscillator

RUN2

SOFT2

Control input to enable/disable the section 2. A high level (>2.4V) enables this section, a low

level (>0.8V) shuts it down.

Soft-start input for the section 2. The soft-start time is programmed by an external capacitor

connected between this pin and GND. Approximately, 1ms/nF @full load.

COMP2

I2SNS

V2SNS

V13IN

Feedback input for the section 2.

This pin connects to the (+) input of the section 2 internal current sense comparator

This pin connects to the (-) input of the section 2 internal current sense comparator

12V regulator input supply voltage, included between 13 and 20V. This voltage can be

supplied by a flyback winding.

REG12

12V regulator output voltage. It can source up to 150mA to an external load

PWROK2

Power good diagnostic signal. This output is driven high when section 2 is enabled and

running properly, after a delay defined by CRST capacitor

H2STRAP

H2GATE

H2SRC

Section 2 bootstrap capacitor connection

Gate- driver output for the section 2 high-side N-MOS

Section 2 high-side N-MOS source connection

R2GATE

PGND

Gate- driver output for the section 2 low- side N-MOS (synchronous rectifier).

Current return for drivers

PREG5

+5V regulator supply. Used mainly for bootstrap capacitors. It should be bypassed to ground.

Gate-driver output for the section 1 low-side N-MOS (synchronous rectifier).

Section 1 high-side N-MOS source connection

R1GATE

H1SRC

H1GATE

Gate-driver output for the section 1 high-side N-MOS

3/8

L5994

ELECTRICAL CHARACTERISTICS IN

OSC

(V = 12V; T = 25°C; V

= GND; unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

DC CHARACTERISTICS

V_IN

Input Supply Voltage

5.0

I₂

Operating Quiescent Current

R1GATE = R2GATE = OPEN

H1GATE = H2GATE = OPEN

RUN2 = RUN1 = SREG5

(DRIVERS OFF)

1.35

I₂

Stand-By Current

RUN2= RUN1 = GND

_IN= 12V

100

120

µA

V^IN= 20V

SECTION 1 PWM CONTROLLER

V_1OUT(*)

V1SNS Feedback Voltage

V_IN= 5.0 to 20V;

1.843

1.9

1.957

_I1SNS- V_V1SNS= 0 to 40mV

V₆- V₅

Over-Current Threshold Voltage VSOFT1 = 4V

Pulse Skipping Mode

Thereshold Voltage

V_IN> 6.8V

V_IN< 5.8V

6.5

V₅

Over Voltage Threshold ON

V1SNS

1.99

2.052

2.11

1.80

Under Voltage Threshold ON

V1SNS

1.695

1.748

SECTION 2 PWM CONTROLLER

V_2OUT(*)

V2SNS Feedback Voltage

V_IN= 5.0 to 20V;

1.610

1.66

1.709

_I2SNS- V_V2SNS= 0 to 40mV

V₁₉- V₂₀

Over Current Threshold Voltage VSOFT2 = 4V

Pulse Skipping Mode Threshold V_IN= 5.0 to 20V;

Voltage

V₂₀

Over Voltage Threshold ON

V2SNS

1.738

1.48

1.792

1.527

1.845

1.572

Under Voltage Threshold ON

V2SNS

PWM CONTROLLERS CHARACTERISTICS (BOTH SECTIONS)

F_OSC

Switching Frequency Accuracy

OSC = SREG5/2

255

170

2.4

300

200

345

230

2.6

kHz

OSC = 0 or SREG5

V₁₅

Voltage Range for 300kHz

Operation

T_OFF

T_OV

Dead Time

300

375

450

Overvoltage Propagation Time

V1SNS to PWROK or

V2SNS to PWROK

1.25

µs

T_UV

Undervoltage Propagation Time V1SNS to PWROK or

V2SNS to PWROK

1.5

4.8

V₅, V₂₀

I₈, I₁₇

Output UVLO Threshold

Soft Start Charge Current

Soft Start Clamp Voltage

Respect output voltage

3.2

V₈, V₁₇

(*) Guaranteed by design, not tested in production

4/8

L5994

ELECTRICAL CHARACTERISTICS

(Continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

HIGH AND LOW SIDE GATE DRIVER (BOTH SECTIONS)

I₂₅, I_27,

I₃₂, I₃₀

Source Output Peak Current

Sink Output Peak Current

C_LOAD= 1nF

0.2

0.5

Ω

R_H

R_L

R_DSONResistance (or Impedance) Driver OUT HIGH

R_DSONresistance (or Impedance) Driver OUT LOW

V_OH

Output High Voltage

Output Low Voltage

Cross-Conduction Delay

HSTRAP = PREG5

_SOURCE= 10mA; HSRC = GND

HSTRAP = PREG5

_SINK= 10mA HSRC = GND

4.40

5.3

5.61

V_OL

T_CC

0.5

130

12V LINEAR REGULATOR SECTION

V₂₁

V₂₂

I₂₂

Input Voltage Range

Output Voltage

11.54

120

I₂₂= 0 to 120mA

V_REG12= 12V

V_REG12= 0V

12.0

12.48

Current Limiting

Short Circuit Current

Input Voltage Clamp

150

V_CP

I_CLAMP= 100µA

”One Shot” Activation Threshold V_13INFalling

”One Shot” Pulse

12.88

13.7

5.3

14.52

1.5

µs

INTERNAL REGULATOR (VPREG5) AND REFERENCE VOLTAGE

V₂₉

VREG5 Output Voltage

V_IN= 5.0 to 20V

_LOAD= 0 to 5mA

5.0

5.61

4.7

I₂₉

Total Current Capability

VPREG5 = 5.3V

_REG5= 6V

Switch-Over Threshold Voltage

Reference Voltage

4.3

4.53

2.5

V₁₂

V^IN= 5.0 to 20V

_LOAD= 1 to 5mA

2.5

I₁₂

Source Current at Reference

Voltage

POWER GOOD AND ENABLE FUNCTION

V₁₆, V₁₁

T₁₀

RUN2, RUN1, Enable Voltage

RUN2, RUN1, Disable Voltage

Power Good Delay

HIGH LEVEL

LOW LEVEL

2.4

0.8

240

CCRST = 100nF

C_CRST= 100nF,

160

200

T₂₇, T₃₀

Shutdown Delay Time before

Low Side Activation

(Except Over-Voltage Fault)

CRST Timing Rate

ms/nF

Power Good High Level

Power Good LowLevel

I_PWROK= 40 A

4.1

I_PWROK= 320µA

0.4

SYNCHRONIZATION

Synchronisation Pulse Width

400

Synchronisation Input Voltage

(Falling Edge Transition)

5/8

L5994

APPLICATION CIRCUIT

9DIN8A6

6/8

L5994

inch

DIM.

OUTLINE AND

MECHANICAL DATA

MIN. TYP. MAX. MIN. TYP. MAX.

1.60

0.063

0.006

0.05

1.35

0.30

0.09

0.15 0.002

1.40

0.37

1.45 0.053 0.055 0.057

0.45 0.012 0.015 0.018

0.20 0.004

0.008

9.00

7.00

5.60

0.80

9.00

7.00

5.60

0.60

1.00

0.354

0.276

0.220

0.031

0.354

0.276

0.220

0.45

0.75 0.018 0.024 0.030

0.039

TQFP32

0°(min.), 7°(max.)

0.10mm

.004

Seating Plane

TQFP32

7/8

L5994

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences

of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is

granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are

subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products

are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics

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http://www.st.com

8/8

L5994 [STMICROELECTRONICS]

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