C
OFF
V
ID4
V
ID3
V
ID2
V
CC
V
FB
PWRGD
COMP
IRL3103
IRL3103
1
F
12V
5V
1.2
H
GATE(H)
GATE(L)
PGnd
1200
F/10V x 3
330pF
V
ID1
SS
ENABLE
LGnd
PCB
trace 6m
0.1
F
0.1
F
V
ID0
1200
F
10V x 5
PWRGD
ENABLE
V
ID4
V
ID3
V
ID2
V
ID1
V
ID0
Pentium II
System
1000pF
3.3K
CS5165
V
SS
V
CC
Features
s
V
2
TM Control Topology
s
Dual N Channel Design
s
100ns Controller Transient
Response
s
Excess of 1Mhz Operation
s
5 Bit DAC with 1% Tolerance
s
Power Good Output With
Internal Delay
s
Enable Input Provides
Micropower Shutdown Mode
s
Complete Pentium
II System
Requires 18 Components
s
5V and 12V Operation
s
Adaptive Voltage Positioning
s
Remote Sense Capability
s
Current Sharing Capability
s
V
CC
Monitor
s
Hiccup Mode Short Circuit
Protection
s
Overvoltage Protection (OVP)
s
Programmable Soft Start
s
150ns PWM Blanking
s
65ns FET Non-Overlap
s
40ns Gate Rise and Fall Times
(3.3nF load)
Package Options
CS5165
Fast, Precise 5-Bit Synchronous Buck Controller
for the Next Generation Low Voltage Pentium
II Processors
CS5165
Description
The CS5165 synchronous 5-bit NFET
buck controller is optimized to manage
the power of the next generation
Pentium
II processors. It's V
2
TM control
architecture delivers the fastest transient
response (100ns), and best overall voltage
regulation in the industry today. It's fea-
ture rich design gives end users the maxi-
mum flexibility to implement the best
price/performance solutions for their end
products.
The CS5165 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 pro-
grammable soft start insures a control
start up, and the FET nonoverlap circuit-
ry ensures that both FETs do not conduct
simultaneously.
The on board oscillator can be pro-
grammed up to 1MHz to give the design-
er maximum flexibility in choosing exter-
nal components and setting systems costs.
The CS5165 protects the processor during
potentially catastrophic events like over-
voltage (OVP) and short circuit. The OVP
feature is part of the V
2
TM architecture and
does not require any additional compo-
nents. 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 CS5165 is designed for use in both
single processor desktop and multipro-
cessor workstation and server applica-
tions. The CS5165's current sharing capa-
bility allows the designer to build multi-
ple parallel and redundant power solu-
tions for multiprocessor systems.
The CS5165 contains other control and
protection features such as Power Good,
ENABLE, and adaptive voltage position-
ing. It is available in a 16 lead SOIC wide
body package.
Application Diagram
1
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
V
2
is 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. 6/28/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A Company
Absolute Maximum Ratings
Pin Symbol
Pin Name
V
MAX
V
MIN
I
SOURCE
I
SINK
2
PACKAGE PIN #
PIN SYMBOL
FUNCTION
Package Pin Description
CS5165
V
CC
IC Power Input
16V
-0.3V
N/A
1.5A Peak
200mA DC
SS
Soft Start Capacitor
6V
-0.3V
200A
10A
COMP
Compensation Capacitor
6V
-0.3V
10mA
1mA
V
FB
Voltage Feedback Input
6V
-0.3V
10A
10A
C
OFF
Off-Time Capacitor
6V
-0.3V
1mA
50mA
V
ID0-4
Voltage ID DAC Inputs
6V
-0.3V
1mA
10A
GATE(H)
High-Side FET Driver
16V
-0.3V
1.5A Peak;
1.5A Peak;
200mA DC
200mA DC
GATE(L)
Low-Side FET Driver
16V
-0.3V
1.5A Peak;
1.5A Peak;
200mA DC
200mA DC
ENABLE
Enable Input
6V
-0.3V
100A
1mA
PWRGD
Power-Good Output
6V
-0.3V
10A
30mA
PGnd
Power Ground
0V
0V
1.5A Peak
N/A
200mA DC
LGnd
Logic Ground
0V
0V
100mA
N/A
Operating Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 150C
Lead Temperature Soldering:
Reflow (SMD styles only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 sec max. above 183C, 230C Peak
Storage Temperature Range, T
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C
ESD Susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
1,2,3,4,6 V
ID0
-V
ID4
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 nor-
mal 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 CS5165 into a low cur-
rent 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 V
FB
is 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 V
FB
Comparator feedback input.
CS5165
3
Electrical Characteristics: 0C < T
A
< 70C; 0C < T
J
< 125C; 8V < V
CC
< 14V;
2.8V DAC Code (V
ID4
=V
ID2
=V
ID1
=V
ID0
=1, V
ID3
= 0), C
GATE(H)
= C
GATE(L)
= 3.3nF, C
OFF
= 330pF, C
SS
= 0.1F; Unless otherwise stated.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
V
CC
Supply Current
Operating
1V < V
FB
< V
DAC
(max on-time)
12
20
mA
No Loads on Gate(H) and Gate(L)
Sleep Mode
ENABLE = 0V
300
600
A
s
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
s
Error Amplifier
V
FB
Bias Current
V
FB
= 0V
0.1
1.0
A
COMP Source Current
COMP = 1.2V to 3.6V; V
FB
= 2.7V
15
30
60
A
COMP CLAMP Voltage
V
FB
= 2.7V, Adjust COMP voltage for
0.85
1.0
1.15
V
Comp current = 50A
COMP Clamp Current
COMP = 0V
0.4
1.0
1.6
mA
COMP Sink Current
V
COMP
=1.2V; V
FB
= 3V; V
SS
> 2.5V
180
400
800
A
Open Loop Gain
Note 1
50
60
dB
Unity Gain Bandwidth
Note 1
0.5
2
MHz
PSRR @ 1kHZ
Note 1
60
85
dB
s
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)
40
80
ns
Fall Time
(V
CC
- 2.5V) > GATE > 1.6V
40
80
ns
GATE(H) to GATE(L) Delay
GATE(H) < 2V, GATE(L) > 2V
30
65
100
ns
GATE(L) to GATE(H) Delay
GATE(L) < 2V, GATE(H) > 2V
30
65
100
ns
GATE pull-down
Resistance to PGnd (note 1)
20
50
115
k
s
Fault Protection
SS Charge Time
V
FB
= 0V
1.6
3.3
5.0
ms
SS Pulse Period
V
FB
= 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, V
SS
= 0V
0.50
0.95
1.10
V
V
FB
Low Comparator
Increase V
FB
till no SS
0.9
1.0
1.1
V
pulsing and normal Off-time.
s
PWM Comparator
Transient Response
V
FB
= 1.2 to 5V 500ns after
100
150
ns
GATE(H) (after Blanking time) to
GATE(H) = (V
CC
- 1V) to 1V
CS5165
4
Electrical Characteristics: 0C < T
A
< 70C; 0C < T
J
< 125C; 8V < V
CC
< 14V;
2.8V DAC Code (V
ID4
=V
ID2
=V
ID1
=V
ID0
=1, V
ID3
= 0), C
GATE(H)
= C
GATE(L)
= 3.3nF, C
OFF
= 330pF, C
SS
= 0.1F; Unless otherwise stated.
s
Voltage Identification DAC
Accuracy
(all codes except 11111)
Measure V
FB
= COMP (C
OFF
= 0V)
-1
+1
%
V
ID4
V
ID3
V
ID2
V
ID1
V
ID0
25C T
J
125C; V
CC
= 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
s
PWM Comparator: continued
Minimum Pulse Width
Drive V
FB
1.2 to 5V upon
50
150
250
ns
(Blanking Time)
GATE(H) rising edge (> V
CC
-1V),
measure GATE(H ) pulse width
s
C
OFF
Normal Off-Time
V
FB
= 2.7V
1.0
1.6
2.3
s
Extended Off-Time
V
SS
= V
FB
= 0V
5.0
8.0
12.0
s
s
Time-Out Timer
Time-Out Time
V
FB
= 2.7V, Measure
GATE(H ) Pulse Width
10
30
50
s
Fault Duty Cycle
V
FB
= 0V
30
50
70
%
s
Enable Input
ENABLE Threshold
GATE(H) Switching
0.8
1.15
1.30
V
Shutdown delay (Note 1)
ENABLE-to-GATE(H) < 2V
3
s
Pull-up Current
ENABLE = 0V
3
7
15
A
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
k
CS5165
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
%
s
DAC CODE
V
ID4
V
ID3
V
ID2
V
ID1
V
ID0
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
ID4
V
ID3
V
ID2
V
ID1
V
ID0
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
k
Input Pull-up Voltage
4.85
5.00
5.15
V
s
Power Good Output
Low to High Delay
V
FB
=
(
0.8 V
DAC
)
to V
DAC
30
65
110
s
High to Low Delay
V
FB
= V
DAC
to
(
0.8 V
DAC
)
30
75
120
s
Output Low Voltage
V
FB
= 2.4V, I
PWRGD
= 500A
0.2
0.3
V
Sink Current Limit
V
FB
= 2.4V, PWRGD = 1V
0.5
4.0
15.0
mA
Electrical Characteristics: 0C < T
A
< 70C; 0C < T
J
< 125C; 8V < V
CC
< 14V;
2.8V DAC Code (V
ID4
=V
ID2
=V
ID1
=V
ID0
=1, V
ID3
= 0), C
GATE(H)
= C
GATE(L)
= 3.3nF, C
OFF
= 330pF, C
SS
= 0.1F; Unless otherwise stated.
PDF 
ZIP