Cherry Semiconductor CS5165H Datasheet

Features

■ V

2

™

Control Topology

■ Dual N Channel Design

■ 100ns Controller Transient

Response

■ Excess of 1Mhz Operation

■ 5 Bit DAC with 1% Tolerance

■ Power Good Output With

Internal Delay

■ Enable Input Provides

Micropower Shutdown Mode

■ Complete Pentium

®

II System

Requires 18 Components

■ 5V and 12V Operation Using

Either Dual or Single Supplies

■ Adaptive Voltage Positioning

■ Remote Sense Capability

■ Current Sharing Capability

■ V

CC

Monitor

■ Hiccup Mode Short Circuit

Protection

■ Overvoltage Protection (OVP)

■ Programmable Soft Start

■ 150ns PWM Blanking

■ 65ns FET Non-Overlap

■ 40ns Gate Rise and Fall Times

(3.3nF load)

Package Options

CS5165H

Fast, Precise 5-Bit Synchronous Buck Controller

for the Next Generation Low Voltage Pentium® II Processors

CS5165H

Description

The CS5165H synchronous 5-bit NFET
buck controller is optimized to manage
the power of the next generation
Pentium

®

II processors. It’s V

2

™

control
architecture delivers the fastest transient
response (100ns), and best overall voltage
regulation in the industry today. It’s fea­ture rich design gives end users the maxi­mum flexibility to implement the best
price/performance solutions for their end
products.

The CS5165H has been carefully crafted
to maximize performance and protect the
processor during operation. It has a 5-bit
DAC on board that holds a ±1% tolerance
over temperature. Its on board pro­grammable soft start insures a control
start up, and the FET nonoverlap circuit­ry ensures that both FETs do not conduct
simultaneously.

The on board oscillator can be pro­grammed up to 1MHz to give the design­er maximum flexibility in choosing exter­nal components and setting systems
costs.

The CS5165H protects the processor dur­ing potentially catastrophic events like
overvoltage (OVP) and short circuit. The
OVP feature is part of the V

2

™

architec­ture and does not require any additional
components. During short circuit, the
controller pulses the MOSFETs in a “hic­cup” mode (3% duty cycle) until the fault
is removed. With this method, the
MOSFETs do not overheat or self
destruct.

The CS5165H is designed for use in both
single processor desktop and multipro­cessor workstation and server applica­tions. The IC can be powered from either
single or dual 5V, 12V power supplies.
The CS5165H’s current sharing capability
allows the designer to build multiple par­allel and redundant power solutions for
multiprocessor systems.

The CS5165H contains other control and
protection features such as Power Good,
ENABLE, and adaptive voltage position­ing. It is available in a 16 lead SOIC wide
body package.

Application Diagram

16 Lead SO WIDE

1

V

ID0

V

ID1

V

ID2

V

ID3

ENABLE

C

OFF

SS

V

ID4

V

FB

COMP

LGnd

PWRGD

GATE(L)

PGnd

GATE(H)

V

CC

V2is a trademark of Switch Power, Inc.

Pentium is a registered trademark of Intel Corporation.

5V to 2.8V @ 14.2A for 300MHz Pentium

®

II

Rev. 12/24/98

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

A Company

®

12V

1µF

V

SS

0.1µF

0.1 µF
330pF

COMP

C

OFF

V

V
V

V

V

ID4

ID3
ID2

ID1

ID0

CS5165H

CC

GATE(H)
GATE(L)

PGnd
LGnd

V

FB

PWRGD

ENABLE

5V

1200µF/10V x 3

IRL3103

IRL3103

3.3K

1000pF

1.2µH

PCB

trace 6mΩ

1200µF
10V x 5

V

V

PWRGD
ENABLE

V

ID0

V

ID1

V

ID2

V

ID3

V

ID4

CC

SS

Pentium® II
System

1

Absolute Maximum Ratings

Pin Symbol Pin Name

V

MAX

V

MIN

I

SOURCE

I

SINK

2

PACKAGE PIN # PIN SYMBOL FUNCTION

Package Pin Description

CS5165H

1,2,3,4,6 V

ID0-VID4

Voltage ID DAC inputs. These pins are internally pulled up to 5V if left open.
V

ID4

selects the DAC range. When V

ID4

is high (logic one), the Error Amp ref-

erence range is 2.14V to 3.54V with 100mV increments. When V

ID4

is low (logic

zero), the Error amp reference voltage is 1.34V to 2.09V with 50mV increments.

5 SS Soft Start Pin. A capacitor from this pin to LGnd sets the Soft Start and fault

timing.

7 C

OFF

Off-Time Capacitor Pin. A capacitor from this pin to LGnd sets both the nor­mal and extended off time.

8 ENABLE Output Enable Input. This pin is internally pulled up to 1.8V. A logic Low

( < 0.8V) on this pin disables operation and places the CS5165H into a low
current sleep mode.

9 V

CC

Input Power Supply Pin.
10 GATE(H) High Side Switch FET driver pin.
11 PGnd High Current ground for the GATE(H) and GATE(L) pins.
12 GATE(L) Low Side Synchronous FET driver pin.
13 PWRGD Power Good Output. Open collector output drives low when VFBis out of

regulation. Active when ENABLE input is low
14 LGnd Reference ground. All control circuits are referenced to this pin.
15 COMP Error Amp output. PWM Comparator reference input. A capacitor to LGnd

provides Error Amp compensation.
16 V

FB

Error Amp, PWM Comparator, and Low VFBComparator feedback input.

V

CC

IC Power Input 20V -0.3V N/A 1.5A Peak

200mA DC

SS Soft Start Capacitor 6V -0.3V 200µA 10µA

COMP Compensation Capacitor 6V -0.3V 10mA 1mA

V

FB

Voltage Feedback Input 6V -0.3V 10µA 10µA

C

OFF

Off-Time Capacitor 6V -0.3V 1mA 50mA

V

ID0-4

Voltage ID DAC Inputs 6V -0.3V 1mA 10µA

GATE(H) High-Side FET Driver 20V -0.3V 1.5A Peak; 1.5A Peak;

200mA DC 200mA DC

GATE(L) Low-Side FET Driver 20V -0.3V 1.5A Peak; 1.5A Peak;

200mA DC 200mA DC

ENABLE Enable Input 6V -0.3V 100µA 1mA

PWRGD Power-Good Output 6V -0.3V 10µA 30mA

PGnd Power Ground 0V 0V 1.5A Peak N/A

200mA DC

LGnd Logic Ground 0V 0V 100mA N/A

Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 150°C

Lead Temperature Soldering:

Reflow (SMD styles only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 Sec max. above 183°C, 230°C Peak

Storage Temperature Range, T

S

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C

ESD Susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV

■ V

CC

Supply Current

Operating 1V < VFB< V

DAC

(max on-time) 12 20 mA

No Loads on Gate(H) and Gate(L)

Sleep Mode ENABLE = 0V, 8V< V

CC

<14V 300 600 µA

■ V

CC

Monitor

Start Threshold GATE(H) Switching 3.75 3.95 4.15 V
Stop Threshold GATE(H) not switching 3.65 3.87 4.05 V

Hysteresis Start - Stop 80 mV

■ Error Amplifier

V

FB

Bias Current VFB= 0V 0.1 1.0 µA
COMP Source Current COMP = 1.2V to 3.6V; VFB= 2.7V 15 30 60 µA
COMP CLAMP Voltage VFB= 2.7V, Adjust COMP voltage for 0.85 1.0 1.15 V

Comp current = 50µA
COMP Clamp Current COMP = 0V 0.4 1.0 1.6 mA
COMP Sink Current V

COMP

=1.2V; V

FB

= 3V; VSS> 2.5V 180 400 800 µA
Open Loop Gain Note 1 50 60 dB
Unity Gain Bandwidth Note 1 0.5 2 MHz
PSRR @ 1kHZ Note 1 60 85 dB

■ GATE(H) and GATE(L)

High Voltage at 100mA Measure V

CC

-GATE 1.2 2.0 V
Low Voltage at 100mA Measure GATE 1.0 1.5 V
Rise Time 1.6V < GATE < (V

CC

- 2.5V),

8V < V

CC

< 14V 40 80 ns

Fall Time (V

CC

- 2.5V) > GATE > 1.6V,

8V < V

CC

< 14V 40 80 ns

GATE(H) to GATE(L) Delay GATE(H) < 2V, GATE(L) > 2V,

8V < V

CC

< 14V 30 65 100 ns

GATE(L) to GATE(H) Delay GATE(L) < 2V, GATE(H) > 2V,

8V < V

CC

< 14V 30 65 100 ns

GATE pull-down Resistance to PGnd (note 1) 20 50 115 kΩ

■ Fault Protection

SS Charge Time VFB= 0V 1.6 3.3 5.0 ms
SS Pulse Period VFB= 0V 25 100 200 ms
SS Duty Cycle (Charge Time/Period) × 100 1.0 3.3 6.0 %
SS Comp Clamp Voltage V

FB

= 2.7V, VSS= 0V 0.50 0.95 1.10 V

VFBLow Comparator Increase VFBtill no SS 0.9 1.0 1.1 V

pulsing and normal Off-time.

■ PWM Comparator

Transient Response VFB= 1.2 to 5V 500ns after 100 150 ns

GATE(H) (after Blanking time) to
GATE(H) = (VCC- 1V) to 1V,

8V < V

CC

< 14V

CS5165H

3

Electrical Characteristics: 0˚C < TA< 70˚C; 0˚C < TJ < 125˚C; 8V < VCC< 20V; 2.8V DAC Code (V

ID4=VID2=VID1=VID0

=1, V

ID3

= 0),

C

GATE(H)

= C

GATE(L)

= 3.3nF, C

OFF

= 330pF, CSS= 0.1µF; Unless otherwise stated.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS5165H

4

Electrical Characteristics: 0˚C < TA< 70˚C; 0˚C < TJ < 125˚C; 8V < VCC< 20V; 2.8V DAC Code (V

ID4=VID2=VID1=VID0

=1, V

ID3

= 0),

C

GATE(H)

= C

GATE(L)

= 3.3nF, C

OFF

= 330pF, CSS= 0.1µF; Unless otherwise stated.

■ Voltage Identification DAC

Accuracy (all codes except 11111) Measure V

FB

= COMP (C

OFF

= 0V) -1 +1 %

V

ID4VID3VID2VID1VID0

25˚C ≤ TJ≤ 125˚C; VCC= 12V

1 0 0 0 0 3.505 3.540 3.575 V
1 0 0 0 1 3.406 3.440 3.474 V
1 0 0 1 0 3.307 3.340 3.373 V
1 0 0 1 1 3.208 3.240 3.272 V
1 0 1 0 0 3.109 3.140 3.171 V
1 0 1 0 1 3.010 3.040 3.070 V
1 0 1 1 0 2.911 2.940 2.969 V
1 0 1 1 1 2.812 2.840 2.868 V
1 1 0 0 0 2.713 2.740 2.767 V
1 1 0 0 1 2.614 2.640 2.666 V
1 1 0 1 0 2.515 2.540 2.565 V
1 1 0 1 1 2.416 2.440 2.464 V
1 1 1 0 0 2.317 2.340 2.363 V
1 1 1 0 1 2.218 2.240 2.262 V
1 1 1 1 0 2.119 2.140 2.161 V
0 0 0 0 0 2.069 2.090 2.111 V
0 0 0 0 1 2.020 2.040 2.060 V
0 0 0 1 0 1.970 1.990 2.010 V
0 0 0 1 1 1.921 1.940 1.959 V
0 0 1 0 0 1.871 1.890 1.909 V
0 0 1 0 1 1.822 1.840 1.858 V
0 0 1 1 0 1.772 1.790 1.808 V
0 0 1 1 1 1.723 1.740 1.757 V
0 1 0 0 0 1.673 1.690 1.707 V
0 1 0 0 1 1.624 1.640 1.656 V

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

■ PWM Comparator: continued

Minimum Pulse Width Drive VFB1.2 to 5V upon 50 150 250 ns
(Blanking Time) GATE(H) rising edge (> VCC-1V),

measure GATE(H ) pulse width,
8V < V

CC

< 14V

■ C

OFF

Normal Off-Time VFB= 2.7V 1.0 1.6 2.3 µs
Extended Off-Time VSS= VFB= 0V 5.0 8.0 12.0 µs

■ Time-Out Timer

Time-Out Time VFB= 2.7V, Measure

GATE(H ) Pulse Width 10 30 50 µs

Fault Duty Cycle VFB= 0V 30 50 70 %

■ Enable Input

ENABLE Threshold GATE(H) Switching 0.8 1.15 1.30 V
Shutdown delay (Note 1) ENABLE-to-GATE(H) < 2V 3 µs
Pull-up Current ENABLE = 0V 3 7 15 µA
Pull-up Voltage No load on ENABLE pin 1.30 1.8 3 V
Input Resistance ENABLE = 5V,

R = (5V-V

PULLUP

)/I

ENABLE

10 20 50 kΩ

CS5165H

5

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

THRESHOLD ACCURACY

LOWER THRESHOLD UPPER THRESHOLD

MIN TYP MAX MIN TYP MAX UNIT

% of Nominal DAC Output -12 -8.5 -5 5 8.5 12 %

■ DAC CODE

V

ID4VID3VID2VID1VID0

1 0 0 0 0 3.115 3.239 3.363 3.717 3.841 3.965 V
1 0 0 0 1 3.027 3.148 3.268 3.612 3.732 3.853 V
1 0 0 1 0 2.939 3.056 3.173 3.507 3.624 3.741 V
1 0 0 1 1 2.851 2.965 3.078 3.402 3.515 3.629 V
1 0 1 0 0 2.763 2.873 2.983 3.297 3.407 3.517 V
1 0 1 0 1 2.675 2.782 2.888 3.192 3.298 3.405 V
1 0 1 1 0 2.587 2.690 2.793 3.087 3.190 3.293 V
1 0 1 1 1 2.499 2.599 2.698 2.982 3.081 3.181 V
1 1 0 0 0 2.411 2.507 2.603 2.877 2.973 3.069 V
1 1 0 0 1 2.323 2.416 2.508 2.772 2.864 2.957 V
1 1 0 1 0 2.235 2.324 2.413 2.667 2.756 2.845 V
1 1 0 1 1 2.147 2.233 2.318 2.562 2.647 2.733 V
1 1 1 0 0 2.059 2.141 2.223 2.457 2.539 2.621 V
1 1 1 0 1 1.971 2.050 2.128 2.352 2.430 2.509 V
1 1 1 1 0 1.883 1.958 2.033 2.250 2.322 2.397 V
0 0 0 0 0 1.839 1.912 1.986 2.195 2.268 2.341 V
0 0 0 0 1 1.795 1.867 1.938 2.142 2.213 2.285 V
0 0 0 1 0 1.751 1.821 1.810 2.090 2.159 2.229 V
0 0 0 1 1 1.707 1.775 1.843 2.037 2.105 2.173 V
0 0 1 0 0 1.663 1.729 1.796 1.985 2.051 2.117 V

0 0 1 0 1 1.619 1.684 1.748 1.932 1.996 2.061 V
0 0 1 1 0 1.575 1.638 1.701 1.880 1.942 2.005 V
0 0 1 1 1 1.531 1.592 1.653 1.827 1.888 1.949 V

V

ID4VID3VID2VID1VID0

0 1 0 1 0 1.574 1.590 1.606 V
0 1 0 1 1 1.525 1.540 1.555 V
0 1 1 0 0 1.475 1.490 1.505 V
0 1 1 0 1 1.426 1.440 1.455 V
0 1 1 1 0 1.376 1.390 1.405 V
0 1 1 1 1 1.327 1.340 1.353 V
1 1 1 1 1 1.223 1.247 1.273 V

Input Threshold V

ID4

, V

ID3

, V

ID2

, V

ID1

, V

ID0

1.000 1.250 2.400 V

Input Pull-up Resistance V

ID4

, V

ID3

, V

ID2

, V

ID1

, V

ID0

25 50 100 kΩ

Input Pull-up Voltage 4.85 5.00 5.15 V

■ Power Good Output

Low to High Delay V

FB

= (0.8 × V

DAC

) to V

DAC

30 65 110 µs

High to Low Delay V

FB

= V

DAC

to (0.8 × V

DAC

) 30 75 120 µs

Output Low Voltage V

FB

= 2.4V, I

PWRGD

= 500µA 0.2 0.3 V

Sink Current Limit V

FB

= 2.4V, PWRGD = 1V 0.5 4.0 15.0 mA

Electrical Characteristics: 0˚C < TA< 70˚C; 0˚C < TJ < 125˚C; 8V < VCC< 20V; 2.8V DAC Code (V

ID4=VID2=VID1=VID0

=1, V

ID3

= 0),

C

GATE(H)

= C

GATE(L)

= 3.3nF, C

OFF

= 330pF, CSS= 0.1µF; Unless otherwise stated.

Block Diagram

6

CS5165H

THRESHOLD ACCURACY

LOWER THRESHOLD UPPER THRESHOLD

MIN TYP MAX MIN TYP MAX UNITS

% of Nominal DAC Output -12 -8.5 -5 5 8.5 12 %

■ DAC CODE

V

ID4VID3VID2VID1VID0

0 1 0 0 0 1.487 1.546 1.606 1.775 1.834 1.893 V
0 1 0 0 1 1.443 1.501 1.558 1.722 1.779 1.837 V
0 1 0 1 0 1.399 1.455 1.511 1.670 1.725 1.781 V
0 1 0 1 1 1.355 1.409 1.463 1.617 1.671 1.724 V
0 1 1 0 0 1.311 1.363 1.416 1.565 1.617 1.669 V
0 1 1 0 1 1.267 1.318 1.368 1.512 1.562 1.613 V
0 1 1 1 0 1.223 1.272 1.321 1.460 1.508 1.557 V
0 1 1 1 1 1.179 1.226 1.273 1.407 1.454 1.501 V
1 1 1 1 1 1.097 1.141 1.185 1.309 1.353 1.397 V

Note 1: Guaranteed by design, not 100% tested in production.

Electrical Characteristics: 0˚C < TA< 70˚C; 0˚C < TJ < 125˚C; 8V < VCC< 20V; 2.8V DAC Code (V

ID4=VID2=VID1=VID0

=1, V

ID3

= 0),

C

GATE(H)

= C

GATE(L)

= 3.3nF, C

OFF

= 330pF, CSS= 0.1µF; Unless otherwise stated.

5V

VFB Low
Comparator

Monitor

V

CC

2.5V

PWM Comp

Blanking

0.7V

Normal

Off-Time

Extended

Off-Time

Timeout

-

+

SS High
Comparator

+

-

Maximum

On-Time

Timeout

­+

SS Low
Comparator

Time Out

Timer

(30µs)

3.95V

3.87V

R

S

FAULT

Latch

Off-Time

Timeout

FAULT

Q

FAULT

Q

Q

R

S

Q

PWM
Latch

Edge Triggered

V

GATE(H) = ON

GATE(H) = OFF

C

OFF

One Shot

R

S

Q

PGnd

CC

ENABLE

SS

COMP

V

V

V
V
V

PWRGD

V

FB

LGnd

ID0

ID1

ID2
ID3
ID4

-8.5%

20k

1.25V

5 BIT

DAC

V

CC

+8.5%

-+-

65µs
Delay

7µA

-

+

Enable
Comparator

Error Amplifier

+

-

+

Circuit Bias

1V

60µA

2µA

-

+

PWM
Comparator

-

+

V

CC

V

GATE(H)

V

GATE(L)

PGnd

C

OFF