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19-2010; Rev 0; 4/01
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
General Description
The MAX1813 step-down controller is intended for core
CPU DC-DC converters in notebook computers. The
controller features a dynamically adjustable output (5-
bit DAC), ultra-fast transient response, high DC accura-
cy, and high efficiency necessary for leading-edge
CPU core power supplies. Maxim’s proprietary Quick-
PWM™ quick-response, constant-on-time PWM control
scheme handles wide input/output voltage ratios with
ease and provides 100ns “instant-on” response to load
transients while maintaining a relatively constant switch-
ing frequency.
The MAX1813 is designed specifically for CPU core
applications requiring a voltage-positioned supply. The
voltage-positioning input (VPCS), combined with a
high-DC-accuracy control loop, is used to implement a
power supply that modifies its output set point in
response to the load current. This arrangement
decreases full-load power dissipation and reduces the
required number of output capacitors.
The output voltage can be dynamically adjusted
through the 5-bit digital-to-analog converter (DAC)
inputs over a 0.600V to 2V range. The MAX1813
includes an internal multiplexer that selects between
three different DAC code settings. The first two inputs
are controlled by five digital input pins (D0–D4). The
third input is used for the suspend mode and controlled
by two 4-level input pins (S0, S1). Output voltage transi-
tions are accomplished with a proprietary precision
slew-rate control that minimizes surge currents to and
from the battery while guaranteeing “just-in-time” arrival
at the new DAC setting.
The MAX1813’s 28V input range enables single-stage
buck conversion from high-voltage batteries for the
maximum possible efficiency. Alternatively, the con-
troller’s high-frequency capability combined with two-
stage conversion (stepping down the +5V system
supply instead of the battery) allows the smallest possi-
ble physical size.
The MAX1813 is available in a 28-pin QSOP package.
Applications
Notebook Computers
(Intel IMVP–II/Coppermine)
Docking Stations
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
Typical Operating Circuit appears at end of data sheet.
Features
o High-Efficiency Voltage Positioning
o Quick-PWM Architecture
o ±1% VOUT Accuracy Over Line
o Adjustable Output Slew Rate
o 0.600V to 2V Adjustable Output Range (5-Bit DAC)
o 2V to 28V Battery Input Range
o 200/300/600/1000kHz Switching Frequency
o Output Undervoltage and Overvoltage Protection
o Drives Large Synchronous-Rectifier MOSFETs
o ±20% Accurate Current-Limit
o 10µA Shutdown Supply Current
o 2V ±1% Reference Output
o Power-Good (PGOOD) Indicator
o Small 28-Pin QSOP Package
PART
MAX1813EEI
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
Pin Configuration
TOP VIEW
V+ 1
VPCS 2
SKP/SDN 3
TIME 4
FB 5
CC 6
S0 7
S1 8
VCC 9
TON 10
REF 11
ILIM 12
PGOOD 13
GND 14
MAX1813
QSOP
28 DH
27 LX
26 BST
25 D0
24 D1
23 D2
22 D3
21 D4
20 CODE
19 ZMODE
18 SUS
17 VDD
16 DL
15 PGND
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Coppermine and IMVP-ΙΙ are trademarks of Intel Corp.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
VCC, VDD to GND .....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
D0D4, CODE, ZMODE, SUS, PGOOD to GND ......-0.3V to +6V
SKP/SDN to GND (Note 1) .....................................-0.3V to +16V
ILIM, FB, CC, REF,
TON, TIME, S0, S1 to GND......................-0.3V to (VCC + 0.3V)
VPCS to GND ............................................................-2V to +30V
DL to PGND................................................-0.3V to (VDD + 0.3V)
BST to PGND..........................................................-0.3V to +36V
DH to LX ....................................................-0.3V to (VBST + 0.3V)
LX to BST..................................................................-6V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)..........860mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: SKP/SDN may be forced to 12V, temporarily exceeding the absolute maximum rating, for the purpose of debugging proto-
type breadboards, using the no-fault test mode.
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, VCC = VDD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = VCC, VOUT set to 1.5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
SYMBOL
CONDITIONS
Battery voltage, V+
VCC, VDD
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.925V to 2.0V
MIN TYP MAX UNITS
2 28
V
4.5 5.5
-1 +1
DC Output Voltage Accuracy
(Notes 2, 3)
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.700V to 0.900V
-1.5
+1.5
%
VPCS Input Bias Current
VPCS Transconductance
VPCS Linear Input Range
FB Input Resistance
TIME Frequency Accuracy
ILIM Input Leakage Current
On-Time (Note 4)
Minimum Off-Time (Note 4)
BIAS AND REFERENCE
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.600V to 0.675V
IVPS
VVPCS = 0 or 28V
Gm VVPCS = 0 to -100mV
RFB
IILIM
tON
tOFF(MIN)
38kHz nominal, RTIME = 470k
150kHz nominal, RTIME = 120k
380kHz nominal, RTIME = 47k
VILIM = 0 or 5.0V
V+ = 5.0V, VFB = 1.2V TON = GND
TON = REF
V+ = 12V, VFB = 1.2V
TON = open
TON = VCC
TON = REF, open, or VCC
TON = GND
-1.83
-1
18
115
-12
-8
-12
250
165
320
465
+1.83
20
±100
180
0.01
270
190
355
515
400
300
+1
22
265
+12
+8
+12
100
290
215
390
563
500
375
µA
µS
mV
k
%
nA
ns
ns
Quiescent Supply Current (VCC)
ICC
Measured at VCC, FB forced above the
regulation point
1.4 2.5 mA
2 _______________________________________________________________________________________

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Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, VCC = VDD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = VCC, VOUT set to 1.5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
Quiescent Supply Current (VDD)
Quiescent Supply Current (V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
Shutdown Supply Current (V+)
Reference Voltage
REF Fault Lockout Voltage
FAULT PROTECTION
Output Overvoltage Fault Preset
Threshold
Output Overvoltage Fault
Propagation Delay
Output Undervoltage Fault
Threshold
Output Undervoltage Fault
Propagation Delay
Output Undervoltage Fault-
Blanking Time
Current-Limit Threshold (Positive,
Default)
Current-Limit Threshold
(Positive, Adjustable)
IDD
I+
VREF
VOVP
tOVP
VITH
VITH
Negative Current-Limit Threshold
Zero-Crossing Current-Limit
Threshold
Thermal Shutdown Threshold
VCC Undervoltage Lockout
Threshold
PGOOD Lower Trip Threshold
PGOOD Upper Trip Threshold
PGOOD Propagation Delay
PGOOD Output Low Voltage
PGOOD Leakage Current
CONDITIONS
Measured at VDD, FB forced above the
regulation point
Measured at V+
SKP/SDN = GND
SKP/ SDN = GND
SKP/SDN = GND, VCC = VDD = 0 or 5V
VCC = 4.5V to 5.5V, -40µA IREF +40µA
Falling edge, 1% hysteresis
Measured at FB
CODE = GND
CODE = VCC
FB forced to 2% above trip threshold
With respect to unloaded output voltage
FB forced to 2% below trip threshold
From SKP/SDN signal going high, clock
speed set by RTIME
VGND - VVPCS, ILIM = VCC
VGND - VVPCS
VILIM = 0.5V
VILIM = 2V (REF)
VGND - VVPCS, with respect to VITH, ILIM =
VCC
VGND - VVPCS
Rising temperature, hysteresis = 15°C
Rising edge, hysteresis = 20mV, switching
disabled below this level
Measured at FB with respect to unloaded
output voltage, falling edge
Measured at FB with respect to unloaded
output voltage, rising edge
Falling edge, FB forced 2% below or
above PGOOD trip threshold
ISINK = 1mA
High state, forced to 5.5V
MIN
1.98
1.5
2.20
1.95
60
40
40
143
-72
4.05
-15
8
TYP
<1
25
2
<1
<1
2
1.6
MAX
5
40
5
5
5
2.02
1.7
UNITS
µA
µA
µA
µA
µA
V
V
2.25
2.00
1.5
2.30
2.05
V
µs
70 80 %
10 µs
256 clks
50 60
50 60
200 265
-56 -40
mV
mV
mV
5
160
4.45
mV
°C
V
-12.5 -10.5
%
10 12
%
1.5 µs
0.4 V
1 µA
_______________________________________________________________________________________ 3

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Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, VCC = VDD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = VCC, VOUT set to 1.5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
GATE DRIVERS
DH Gate Driver On-Resistance
DL Gate Driver On-Resistance
SYMBOL
CONDITIONS
RON(DH)
RON(DL)
VBST - VLX forced to 5V
High state (pull up)
Low state (pull down)
MIN TYP MAX UNITS
1.2 3.5
1.3 3.5
0.4 1.0
DH Gate Driver Source/Sink
Current
DL Gate Driver Sink Current
DL Gate Driver Source Current
Dead Time
LOGIC AND I/O
IDH DH forced to 2.5V, VBST - VLX forced to 5V
IDL DL forced to 5V
IDL DL forced to 2.5V
DL rising
DH rising
2.0
4.0
1.3
35
26
A
A
A
ns
Logic Input High Voltage
VIH
D0D4, CODE, SUS, ZMODE; VCC = 4.5V
to 5.5V
2.4
V
Logic Input Low Voltage
DAC Z-Mode Programming
Resistor, Low
DAC Z-Mode Programming
Resistor, High
D0D4, CODE Pull Up/Down
Logic Input Current
4-Level Logic Input High (VCC)
VIL
D0D4, CODE, SUS, ZMODE; VCC = 4.5V
to 5.5V
0.8 V
D0D4, 0 to 0.4V or 2.6V to 5.5V applied to
the resistor, ZMODE = CODE = GND or
ZMODE = CODE = VCC
D0D4, 0 to 0.4V or 2.6V to 5.5V applied to
the resistor, ZMODE = CODE = GND or
ZMODE = CODE = VCC
95
1.05 k
k
Entering impedance
mode
Pull up
Pull down
40
k
8
D0D4, CODE = VCC
SUS, ZMODE = GND or VCC
-1 +1
µA
-1 +1
TON (200kHz operation), S0, S1
VCC -
0.4
V
4-Level Logic Input Upper-
Middle (Float)
TON (300kHz operation), S0, S1
2.8 3.85 V
4-Level Logic Input Lower-
Middle (REF)
4-Level Logic Low (GND)
SKP/SDN High Input Level
(Skip Mode)
TON (600kHz operation), S0, S1
1.65 2.35 V
TON (1000kHz operation), S0, S1
0.5 V
2.8 6.0 V
SKP/SDN Float Input Level
(Forced-PWM Mode)
1.4 2.2 V
SKP/SDN Low Input Level
(Shutdown Mode)
0.5 V
4 _______________________________________________________________________________________

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Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, VCC = VDD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = VCC, VOUT set to 1.5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
SKP/SDN NO FAULT Input Level
CONDITIONS
MIN TYP MAX UNITS
12 15 V
SKP/SDN, 4-Level Logic Input
Current
SKP/SDN, TON, S0, S1 = GND or VCC
-3
3 µA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = +15V, VCC = VDD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = VCC, VOUT set to 1.5V,
TA = -40°C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER
PWM CONTROLLER
Input Voltage Range
SYMBOL
CONDITIONS
Battery voltage, V+
VCC, VDD
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.925V to 2.0V
MIN
2
4.5
-1
MAX UNITS
28
V
5.5
+1
DC Output Voltage Accuracy
(Notes 2, 3)
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.700V to 0.900V
-1.5
+1.5
%
VPCS Input Bias Current
VPCS Transconductance
FB Input Resistance
TIME Frequency Accuracy
ILIM Input Leakage Current
On-Time (Note 4)
Minimum Off-Time (Note 4)
BIAS AND REFERENCE
IVPS
Gm
RFB
IILIM
tON
tOFF(MIN)
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.600V to 0.675V
VVPCS = 0 or 28V
VVPS = 0 to -40mV
VVPS = 0 to -100mV
380kHz nominal, RTIME = 47k
150kHz nominal, RTIME = 120k
38kHz nominal, RTIME = 470k
VILIM = 0 or 5.0V
V+ = 5.0V, VFB = 1.2V TON = GND
TON = REF
V+ = 12V, VFB = 1.2V
TON = open
TON = VCC
TON = REF, open, or VCC
TON = GND
-1.83
-1
18
16.5
115
-12
-8
-12
250
165
320
465
+1.83
+1
22
22
265
+12
+8
+12
100
290
215
390
563
500
375
µA
µS
k
%
nA
ns
ns
Quiescent Supply Current (VCC)
ICC
Measured at VCC, FB forced above the
regulation point
2.5 mA
Quiescent Supply Current (VDD)
IDD
Measured at VDD, FB forced above the
regulation point
5 µA
Quiescent Supply Current (V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
I+ Measured at V+
SKP/SDN = GND
SKP/SDN = GND
40 µA
5 µA
5 µA
_______________________________________________________________________________________ 5