19-2734; Rev 1; 9/03
IT
TION K
VALUA
E
BLE
AVAILA
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
General Description
Features
♦
Dual-Phase, Quick-PWM Controllers
♦
±0.75% V
OUT
Accuracy Over Line, Load, and
Temperature (1.3V)
♦
Active Voltage Positioning with Adjustable Gain
and Offset
♦
5-Bit On-Board DAC
Mobile: 0.60V to 1.75V Output Range
Desktop: 1.10V to 1.85V Output Range
♦
Selectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency
♦
4V to 28V Battery Input Voltage Range
♦
Adjustable Slew-Rate Control
♦
Drive Large Synchronous Rectifier MOSFETs
♦
Output Overvoltage Protection (MAX1545 Only)
♦
Undervoltage and Thermal-Fault Protection
♦
Power Sequencing and Timing
♦
Selectable Suspend Voltage (0.675V to 1.45V)
♦
Soft-Shutdown
♦
Selectable Single- or Dual-Phase Pulse Skipping
MAX1519/MAX1545
Applications
Desktop and Mobile P4 Computers
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Low-Voltage, Digitally Programmable Power
Supplies
TIME
TON
SUS
S0
S1
SHDN
OFS
REF
ILIM
V
CC
1
2
3
4
5
6
7
8
9
10
40
39
38
37
36
35
34
33
32
CMP
V+
BSTS
LXS
DHS
DLS
CSN
CMN
CSP
TOP VIEW
31
PGND
The MAX1519/MAX1545 are dual-phase, Quick-PWM™,
step-down controllers for desktop and mobile Pentium
®
4
(P4) CPU core supplies. Dual-phase operation reduces
input ripple current requirements and output voltage rip-
ple while easing component selection and layout difficul-
ties. The Quick-PWM control scheme provides
instantaneous response to fast load-current steps. The
MAX1519/MAX1545 include active voltage positioning
with adjustable gain and offset, reducing power dissipa-
tion and bulk output capacitance requirements.
The MAX1519/MAX1545 are intended for two different
notebook CPU core applications: stepping down the bat-
tery directly or stepping down the 5V system supply to
create the core voltage. The single-stage conversion
method allows these devices to directly step down high-
voltage batteries for the highest possible efficiency.
Alternatively, two-stage conversion (stepping down the
5V system supply instead of the battery) at a higher
switching frequency provides the minimum possible
physical size.
The MAX1519/MAX1545 comply with Intel’s P4 specifi-
cations. The switching regulator features soft-start,
power-up sequencing, and soft-shutdown. The
MAX1519/MAX1545 also feature independent four-level
logic inputs for setting the suspend voltage (S0–S1).
The MAX1519/MAX1545 include output undervoltage
protection (UVP), thermal protection, and voltage regula-
tor power-OK (VROK) output. When any of these protec-
tion features detect a fault, the controller shuts down.
Additionally, the MAX1519/MAX1545 include overvoltage
protection.
The MAX1519/MAX1545 are available in low-profile, 40-
pin, 6mm x 6mm thin QFN packages. For other CPU
platforms, refer to the pin-to-pin compatible MAX1544
and MAX1532/MAX1546/MAX1547 data sheets.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
40 Thin QFN 6mm
✕
6mm
40 Thin QFN 6mm
✕
6mm
MAX1519ETL
-40°C to +100°C
MAX1545ETL
-40°C to +100°C
Pin Configuration
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
20
MAX1519
MAX1545
V
DD
DLM
DHM
LXM
BSTM
VROK
D0
D1
D2
D3
CCV
GNDS
CCI
FB
SKIP
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Pentium is a registered trademark of Intel Corp.
THIN QFN
________________________________________________________________
Maxim Integrated Products
OAIN-
OAIN+
CODE
D4
GND
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
MAX1519/MAX1545
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
V
CC
to GND ..............................................................-0.3V to +6V
V
DD
to PGND............................................................-0.3V to +6V
SKIP,
SUS, D0–D4 to GND.......................................-0.3V to +6V
ILIM, FB, OFS, CCV, CCI, REF, OAIN+,
OAIN- to GND.........................................-0.3V to (V
CC
+ 0.3V)
CMP, CSP, CMN, CSN, GNDS to GND ......-0.3V to (V
CC
+ 0.3V)
TON, TIME, VROK, S0–S1, CODE to GND.-0.3V to (V
CC
+ 0.3V)
SHDN
to GND (Note 1)...........................................-0.3V to +18V
DLM, DLS to PGND ....................................-0.3V to (V
DD
+ 0.3V)
BSTM, BSTS to GND ..............................................-0.3V to +36V
DHM to LXM ...........................................-0.3V to (V
BSTM
+ 0.3V)
LXM to BSTM............................................................-6V to +0.3V
DHS to LXS..............................................-0.3V to (V
BSTS
+ 0.3V)
LXS to BSTS .............................................................-6V to +0.3V
GND to PGND .......................................................-0.3V to +0.3V
REF Short-Circuit Duration .........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
40-Pin 6mm
✕
6mm Thin QFN
(derate 23.2mW/°C above +70°C) ...............................1.860W
Operating Temperature Range .........................-40°C to +100°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
SHDN
may be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables
fault protection and overlapping operation.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
TON
= V
SKIP
= V
S0
= V
S1
= V
CODE
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS = SUS = GNDS = D0–D4 = GND;
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
DC Output Voltage Accuracy
(Note 2)
Line Regulation Error
Input Bias Current
OFS Input Range
ΔV
OUT
/ΔV
OFS;
ΔV
OFS
= V
OFS,
V
OFS
= 0 to 1V
ΔV
OUT
/ΔV
OFS;
ΔV
OFS
= V
OFS
- V
REF,
V
OFS
= 1V to 2V
ΔV
OUT
/ΔV
GNDS
1000kHz nominal, R
TIME
= 15kΩ
TIME Frequency Accuracy
f
TIME
500kHz nominal, R
TIME
= 30kΩ
250kHz nominal, R
TIME
= 60kΩ
Shutdown, R
TIME
= 30kΩ
I
FB
, I
GNDS
I
OFS
Battery voltage, V+
V
CC
, V
DD
V+ = 4.5V to 28V,
includes load
regulation error
DAC codes
≥
1V
DAC codes from
0.60V to 1V
4
4.5
-10
-15
5
-2
-0.1
0
-0.129
-0.129
-20
A
GNDS
0.97
900
460
225
0.99
1000
500
250
125
-0.125
-0.125
+2
+0.1
2
-0.117
V/V
-0.117
+200
1.01
1100
540
275
kHz
mV
V/V
28
5.5
+10
+15
mV
mV
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
= 4.5V to 5.5V, V+ = 4.5V to 28V
FB, GNDS
OFS
OFS Gain
A
OFS
GNDS Input Range
GNDS Gain
2
_______________________________________________________________________________________
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
TON
= V
SKIP
= V
S0
= V
S1
= V
CODE
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS = SUS = GNDS = D0–D4 = GND;
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TON = GND
(550kHz)
TON = REF
(300kHz)
TON = open
(200kHz)
TON = V
CC
(100kHz)
Minimum Off-Time (Note 3)
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)
I
CC
Measured at V
CC
, FB forced above the
regulation point, OAIN- = FB,
V
OAIN+
= 1.3V
Measured at V
DD
, FB forced above the
regulation point
Measured at V+
Measured at V
CC
,
SHDN
= GND
Measured at V
DD
,
SHDN
= GND
Measured at V+,
SHDN
= GND,
V
CC
= V
DD
= 0 or 5V
V
REF
ΔV
REF
V
CC
= 4.5V to 5.5V, I
REF
= 0
I
REF
= -10µA to +100µA
SKIP
= V
CC
, measured at FB with respect
to unloaded output voltage
SKIP
= REF or GND
t
OVP
V
UVP
t
UVP
FB forced 2% above trip threshold
Measured at FB with respect to unloaded
output voltage
FB forced 2% below trip threshold
Lower threshold
(undervoltage)
Upper threshold
(overvoltage)
SKIP
= V
CC
-12
67
1.990
-10
1.70
3.20
mA
t
OFF(MIN)
TON = GND
TON = V
CC
, open, or REF
MIN
155
320
475
920
TYP
180
355
525
1000
300
400
MAX
205
390
ns
575
1140
375
480
ns
UNITS
MAX1519/MAX1545
On-Time (Note 3)
t
ON
V+ = 12V,
V
FB
= V
CCI
= 1.2V
Quiescent Supply Current (V
DD
)
Quiescent Battery Supply Current
(V+)
Shutdown Supply Current (V
CC
)
Shutdown Supply Current (V
DD
)
Shutdown Battery Supply Current
(V+)
Reference Voltage
Reference Load Regulation
FAULT PROTECTION
Output Overvoltage Protection
Threshold (MAX1545 Only)
Output Overvoltage Propagation
Delay (MAX1545 Only)
Output Undervoltage Protection
Threshold
Output Undervoltage Propagation
Delay
I
DD
I
V+
<1
25
4
<1
<1
2.000
5
40
10
5
5
2.010
+10
µA
µA
µA
µA
µA
V
mV
V
OVP
13
16
2.00
10
70
10
-10
19
%
V
µs
73
%
µs
VROK Threshold
Measured at FB
with respect to
unloaded output
voltage
-8
%
+8
+10
+12
_______________________________________________________________________________________
3
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
MAX1519/MAX1545
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
TON
= V
SKIP
= V
S0
= V
S1
= V
CODE
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS = SUS = GNDS = D0–D4 = GND;
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.)
PARAMETER
Output Undervoltage Fault and
VROK Transition Blanking Time
(Note 4)
SYMBOL
t
BLANK
CONDITIONS
Measured from the time when FB reaches
the voltage set by the DAC code; clock
speed set by R
TIME
Measured from the time when FB first
reaches the voltage set by the DAC code
after startup
t
VROK
FB forced 2% outside the VROK trip
threshold
I
SINK
= 3mA
High state, VROK forced to 5.5V
V
UVLO(VCC)
T
SHDN
Rising edge, hysteresis = 90mV, PWM
disabled below this level
Hysteresis = 10°C
4.0
4.25
160
MIN
TYP
24
MAX
UNITS
Clks
VROK Startup Delay
3
5
7
ms
VROK Delay
VROK Output Low Voltage
VROK Leakage Current
V
CC
Undervoltage Lockout
Threshold
Thermal-Shutdown Threshold
CURRENT LIMIT AND BALANCE
Current-Limit Threshold Voltage
(Positive, Default)
Current-Limit Threshold Voltage
(Positive, Adjustable)
Current-Limit Threshold Voltage
(Negative)
Current-Limit Threshold Voltage
(Zero Crossing)
CMP, CMN, CSP, CSN Input
Ranges
CMP, CMN, CSP, CSN Input
Current
Secondary Driver-Disable
Threshold
ILIM Input Current
Current-Limit Default Switchover
Threshold
Current-Balance Offset
Current-Balance
Transconductance
10
0.4
1
4.4
µs
V
µA
V
°C
V
LIMIT
V
LIMIT
V
LIMIT(NEG)
V
ZERO
CMP - CMN, CSP - CSN; ILIM = V
CC
CMP - CMN,
CSP - CSN
V
ILIM
= 0.2V
V
ILIM
= 1.5V
28
8
73
-41
30
10
75
-36
1.5
32
12
77
-31
mV
mV
mV
mV
CMP - CMN, CSP - CSN; ILIM = V
CC
,
SKIP
= V
CC
CMP - CMN, CSP - CSN;
SKIP
= GND
0
V
CSP
= V
CSN
= 0 to 5V
V
CSP
I
ILIM
V
ILIM
(V
CMP
- V
CMN
) - (V
CSP
- V
CSN
); I
CCI
= 0,
-20mV < (V
CMP
- V
CMN
) < 20mV,
1.0V < V
CCI
< 2.0V
V
ILIM
= 0 to 5V
3
-2
3
V
CC
- 1
0.1
V
CC
- 1
2
+2
V
CC
-
0.4
200
V
CC
-
0.4
+2
V
µA
V
nA
V
V
OS(IBAL)
-2
mV
G
m(IBAL)
400
µS
4
_______________________________________________________________________________________
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
TON
= V
SKIP
= V
S0
= V
S1
= V
CODE
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS = SUS = GNDS = D0–D4 = GND;
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.)
PARAMETER
GATE DRIVERS
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
DH_ Gate-Driver Source/Sink
Current
DL_ Gate-Driver Sink Current
DL_ Gate-Driver Source Current
Dead Time
VOLTAGE-POSITIONING AMPLIFIER
Input Offset Voltage
Input Bias Current
Op Amp Disable Threshold
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing
Input Capacitance
Gain-Bandwidth Product
Slew Rate
Capacitive-Load Stability
LOGIC AND I/O
SHDN
Input High Voltage
SHDN
Input Low Voltage
SHDN
No-Fault Threshold
Three-Level Input Logic Levels
Logic Input Current
D0–D4 Logic Input High Voltage
D0–D4 Logic Input Low Voltage
V
IH
V
IL
V
SHDN
High
SUS,
SKIP
SHDN,
SUS,
SKIP
REF
Low
-1
1.6
0.8
12
2.7
1.2
2.3
0.8
+1
µA
V
V
V
0.8
0.4
15
V
V
V
No sustained oscillations
V
OS
I
BIAS
V
OAIN-
V
CM
CMRR
PSRR
A
OA
Guaranteed by CMRR test
V
OAIN+
= V
OAIN-
= 0 to 2.5V
V
CC
= 4.5V to 5.5V
R
L
= 1kΩ to V
CC
/2
|V
OAIN+
- V
OAIN-
|
≥
10mV,
R
L
= 1kΩ to V
CC
/2
V
CC
- V
FBH
V
FBL
OAIN+, OAIN-
3
0
70
75
80
115
100
112
77
47
11
3
0.3
400
300
200
-1
0.1
V
CC
- 1
+1
200
V
CC
-
0.4
2.5
mV
nA
V
V
dB
dB
dB
mV
pF
MHz
V/µs
pF
R
ON(DH)
R
ON(DL)
I
DH
I
DL(SINK)
BST_ - LX_ forced to 5V
High state (pullup)
Low start (pulldown)
DH_ forced to 2.5V,
BST_ - LX_ forced to 5V
DL_ forced to 5V
DL_ rising
DH_ rising
1.0
1.0
0.4
1.6
4
1.6
35
26
4.5
4.5
2
Ω
Ω
A
A
A
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1519/MAX1545
I
DL(SOURCE)
DL_ forced to 2.5V
t
DEAD
_______________________________________________________________________________________
5
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