ON Semiconductor CS5151H Technical data

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CS5151H

CPU 4-Bit Nonsynchronous Buck Controller

The CS5151H is a 4–bit nonsynchronous N–Channel buck controller. It is designed to provide unprecedented transient response for today’s demanding high–density, high–speed logic. The regulator operates using a proprietary control method, which allows a 100 ns response time to load transients. The CS5151H is designed to operate over a 4.25–20 V range (V 12 V as the main supply for conversion.

The CS5151H is specifically designed to power Pentium processors with MMX Technology and other high performance core logic. It includes the following features: on board, 4–bit DAC, short circuit protection, 1.0% output tolerance, V programmable Soft Start capability. The CS5151H is upwards compatible with the 5–bit CS5156H, allowing the mother board designer the capability of using either the CS5151H or the CS5156H with no change in layout. The CS5151H is available in 16 pin surface mount package.

Features

• N–Channel Design

• Excess of 1.0 MHz Operation

• 100 ns Transient Response

• 4–Bit DAC

• Upward Compatible with 5–Bit CS5155H/CS5156H

• 30 ns Gate Rise/Fall Times

• 1.0% DAC Accuracy

• 5.0 V & 12 V Operation

• Remote Sense

• Programmable Soft Start

• Lossless Short Circuit Protection

• V

Monitor

• Adaptive Voltage Positioning

• V

 Control Topology

• Current Sharing

• Overvoltage Protection

) using 12 V to power the IC and 5.0 V or

monitor, and

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SOIC–16

D SUFFIX

CASE 751B

A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week

PIN CONNECTIONS

ID0 ID1 ID2

ID3

OFF

FFB

ORDERING INFORMATION

Device Package Shipping

CS5151HGD16 SO–16 CS5151HGDR16

SO–16

MARKING DIAGRAM

CS5151H AWLYWW

COMPV LGNDV V

CC1

NCSS PGNDNC

GATE

CC2

48 Units/Rail

2500 Tape & Reel

 Semiconductor Components Industries, LLC, 2001

January , 2001 – Rev. 3

1 Publication Order Number:

CS5151H/D

CS5151H

12 V

5.0 V

0.1 µF 1200 µF/16 V × 3

AIEI

2.1 V to 3.5 V @ 13 A

ID0

ID1

ID2

ID3

330 pF

CC1

CC2

CS5151H

GATE

MBR735

IRL3103

2.0 µH

1,2

ID0

ID1

ID2

ID3

OFF

PGND

0.1 µF

0.33 µF

COMP

LGND

3.3 k

FFB

1200 µF/16 V × 5

AIEI

100 pF

Figure 1. Application Diagram, Switching Power Supply for Core Logic – Pentium Processor with

MMX Technology

ABSOLUTE MAXIMUM RATINGS*

Rating Value Unit

Operating Junction Temperature, T

0 to 150 °C Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1.) 230 peak °C Storage Temperature Range, T

–65 to +150 °C

ESD Susceptibility (Human Body Model) 2.0 kV

1. 60 second maximum above 183°C. *The maximum package power dissipation must be observed.

ABSOLUTE MAXIMUM RATINGS

Pin Name Max Operating Voltage Max Current

CC1

CC2

SS 6.0 V/–0.3 V –100 µA

COMP 6.0 V/–0.3 V 200 µA

OFF

FFB

– V

ID0

ID3

GATE

LGND 0 V 25 mA

PGND 0 V 100 mA DC/1.5 A peak

16 V/–0.3 V 25 mA DC/1.5 A peak 20 V/–0.3 V 20 mA DC/1.5 A peak

6.0 V/–0.3 V –0.2 µA

6.0 V/–0.3 V –50 µA 20 V/–0.3 V 100 mA DC/1.5 A peak

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CS5151H

ELECTRICAL CHARACTERISTICS (0°C < T

DAC Code: V

Characteristic

ID2

= V

ID1

= V

ID0

= 1; V

ID3

= 0

;

GATE

< +70°C; 0°C < TJ < +125°C; 8.0 V < V

= 1.0 nF; C

= 330 pF; CSS = 0.1 µF, unless otherwise specified.)

OFF

< 14 V; 5.0 V < V

CC1

Test Conditions Min Typ Max Unit

CC2

< 20 V;

Error Amplifier

Bias Current VFB = 0 V – 0.3 1.0 µA

Open Loop Gain 1.25 V < V

< 4.0 V; Note 2. 50 60 – dB

COMP

Unity Gain Bandwidth Note 2. 500 3000 – kHz COMP SINK Current V COMP SOURCE Current V COMP CLAMP Current V

= 1.5 V; VFB = 3.0 V; VSS > 2.0 V 0.4 2.5 8.0 mA

COMP

= 1.2 V; VFB = 2.7 V; VSS = 5.0 V 30 50 80 µA

COMP

= 0 V; VFB = 2.7 V 0.4 1.0 1.6 mA

COMP

COMP High Voltage VFB = 2.7 V; VSS = 5.0 V 4.0 4.3 5.0 V COMP Low Voltage VFB = 3.0 V – 160 600 mV PSRR 8.0 V < V

Monitor

CC1

< 14 V @ 1.0 kHz; Note 2. 60 85 – dB

CC1

Start Threshold Output switching 3.75 3.90 4.05 V Stop Threshold Output not switching 3.70 3.85 4.00 V Hysteresis Start–Stop – 50 – mV

DAC

Input Threshold V Input Pull Up Resistance V

ID0,

, V

ID1

ID2

ID3

, V

ID1

ID2

ID3

1.00 1.25 2.40 V 25 50 100 kΩ

Pull Up Voltage – 4.85 5.00 5.15 V Accuracy (all codes except 1111) Measure VFB = V V

ID3

ID2

ID1

ID0

, 25°C ≤ TJ ≤ 125°C – – 1.0 %

COMP

1 1 1 1 – 1.2191 1.2440 1.2689 V 1 1 1 0 – 2.1186 2.1400 2.1614 V 1 1 0 1 – 2.2176 2.2400 2.2624 V 1 1 0 0 – 2.3166 2.3400 2.3634 V 1 0 1 1 – 2.4156 2.4400 2.4644 V 1 0 1 0 – 2.5146 2.5400 2.5654 V 1 0 0 1 – 2.6136 2.6400 2.6664 V 1 0 0 0 – 2.7126 2.7400 2.7674 V 0 1 1 1 – 2.8116 2.8400 2.8684 V 0 1 1 0 – 2.9106 2.9400 2.9694 V 0 1 0 1 – 3.0096 3.0400 3.0704 V 0 1 0 0 – 3.1086 3.1400 3.1714 V 0 0 1 1 – 3.2076 3.2400 3.2724 V 0 0 1 0 – 3.3066 3.3400 3.3734 V 0 0 0 1 – 3.4056 3.4400 3.4744 V 0 0 0 0 – 3.5046 3.5400 3.5754 V

2. Guaranteed by design, not 100% tested in production.

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CS5151H

ELECTRICAL CHARACTERISTICS (continued) (0°C < T

5.0

V < V

< 20 V; DAC Code: V

CC2

ID2

= V

ID1

= V

ID0

=1; V

ID3

< +70°C; 0°C < TJ < +125°C; 8.0 V < V

GATE(L)

and CV

GATE(H)

= 1.0 nF; C

< 14 V;

CC1

= 330 pF; CSS = 0.1 µF, unless

OFF

otherwise specified.)

Characteristic

GATE

Out SOURCE Sat at 100 mA Measure V Out SINK Sat at 100 mA Measure V Out Rise Time 1.0 V < V Out Fall Time 9.0 V > V

Test Conditions Min Typ Max Unit

CC2

GATE

– V

GATE

– V

PGND

< 9.0 V; V > 1.0 V; V

CC1

= V

= 12 V – 30 50 ns

CC2

= V

= 12 V – 30 50 ns

CC2

– 1.2 2.0 V – 1.0 1.5 V

Shoot–Through Current Note 3. – – 50 mA V

Resistance Resistor to LGND. Note 3. 20 50 100 kΩ

GATE

Schottky LGND to V

GATE

@ 10 mA – 600 800 mV

GATE

Soft Start (SS)

Charge Time – 1.6 3.3 5.0 ms Pulse Period – 25 100 200 ms Duty Cycle (Charge Time /Pulse Period) × 100 1.0 3.3 6.0 % COMP Clamp Voltage VFB = 0 V; VSS = 0 0.50 0.95 1.10 V V

SS Fault Disable V

FFB

= Low 0.9 1.0 1.1 V

GATE

High Threshold – – 2.5 3.0 V

PWM Comparator

Transient Response

Bias Current V

FFB

= 0 to 5.0 V to V

FFB

= V

CC2

= 12 V

CC1

= 0 V – 0.3 – µA

FFB

= 9.0 V to 1.0 V;

GATE

– 100 125 ns

Supply Current

CC1

CC2

Operating I Operating I

OFF

CC1

CC2

Normal Charge Time V Extension Charge Time VSS = V Discharge Current C

No Switching – 8.5 13.5 mA No Switching – 1.6 3.0 mA VFB = COMP = V VFB = COMP = V

= 1.5 V; VSS = 5.0 V 1.0 1.6 2.2 µs

FFB

to 5.0 V; VFB > 1.0 V 5.0 – – mA

OFF

FFB

= 0 5.0 8.0 11.0 µs

– 8.0 13 mA – 2.0 5.0 mA

Time Out Timer

Time Out Time

Fault Mode Duty Cycle V

VFB = V

Record V

FFB

; V

COMP

= 2.0 V;

FFB

Pulse High Duration

GATE

10 30 65 µs

= 0V 35 50 70 %

3. Guaranteed by design, not 100% tested in production.

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CS5151H

PACKAGE PIN DESCRIPTION

PACKAGE PIN #

16 Lead SO Narrow

1, 2, 3, 4 V

5 SS Soft Start Pin. A capacitor from this pin to LGND in conjunc-

6, 12 NC No Connection.

7 C

PIN SYMBOL FUNCTION

ID0–VID3

OFF

Voltage ID DAC input pins. These pins are internally pulled up to 5.0 V providing logic ones if left open. The DAC range is 2.14 V to 3.54 V with 100 mV increments. V select the desired DAC output voltage. Leaving all 4 DAC

ID0

– V

ID3

input pins open results in a DAC output voltage of 1.244 V, allowing for adjustable output voltage, using a traditional resistor divider .

tion with internal 60 µA current source provides Soft Start function for the controller. This pin disables fault detect function during Soft Start. When a fault is detected, the Soft Start capacitor is slowly discharged by internal 2.0 µA current source setting the time out before trying to restart the IC. Charge/discharge current ratio of 30 sets the duty cycle for the IC when the regulator output is shorted.

A capacitor from this pin to ground sets the time duration for the on board one shot, which is used for the constant off time architecture.

8 V

FFB

Fast feedback connection to the PWM comparator. This pin is connected to the regulator output. The inner feedback loop terminates on time.

9 V

10 V

CC2

GATE

Boosted power for the gate driver. MOSFET driver pin capable of 1.5 A peak switching current.

11 PGND High current ground for the IC. The MOSFET driver is refer-

enced to this pin. Input capacitor ground and the anode of the Schottky diode should be tied to this pin.

13 V

CC1

Input power for the IC.

14 LGND Signal ground for the IC. All control circuits are referenced to

this pin.

15 COMP Error amplifier compensation pin. A capacitor to ground

should be provided externally to compensate the amplifier.

16 V

Error amplifier DC feedback input. This is the master voltage feedback which sets the output voltage. This pin can be connected directly to the output or a remote sense trace.

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