19-4590; Rev 1; 7/09
KIT
ATION
EVALU
BLE
AVAILA
1-Phase Quick-PWM GPU Controller
General Description
The MAX17409 is a 1-phase Quick-PWM™ step-down
VID power-supply controller for high-performance graph-
ics processors. The Quick-PWM control provides instan-
taneous response to fast-load current steps. Active
voltage positioning reduces power dissipation and bulk
output capacitance requirements and allows ideal posi-
tioning compensation for tantalum, polymer, or ceramic
bulk output capacitors.
The MAX17409 is intended for two different notebook
processor core applications: either bucking down the bat-
tery directly to create the core voltage, or bucking down
the +5V system supply. The single-stage conversion
method allows this device to directly step down high-volt-
age batteries for the highest possible efficiency.
Alternatively, 2-stage conversion (stepping down the +5V
system supply instead of the battery) at higher switching
frequency provides the minimum possible physical size.
A slew-rate controller allows controlled transitions
between VID codes. A thermistor-based temperature
sensor provides programmable thermal protection.
The MAX17409 is available in a 28-pin, 4mm x 4mm
TQFN package.
Features
o
1-Phase Quick-PWM Controller
o
±6mV V
OUT
Accuracy Over Line, Load, and
Temperature
o
o
o
o
o
o
o
o
o
6-Bit Graphics DAC (12.5mV LSB)
Active Voltage Positioning with Adjustable Gain
Accurate Droop and Current Limit
Remote Output and Ground Sense
Buffered 2V Reference Output for Offsets
Power-Good Window Comparator
Temperature Comparator
Drives Large Synchronous Rectifier FETs
2V to 26V Power Input Range
MAX17409
o
Adjustable Switching Frequency (600kHz max)
o
Output Overvoltage and Undervoltage Protection
o
Soft-Startup and Soft-Shutdown
o
Internal Boost Diodes
Applications
Graphics Core (GPU) Power Supplies
Voltage-Positioned Step-Down Converters
2-to-4 Li+ Cells Battery to Processor Core
Supply Converters
Notebooks/Desktops/Servers
PART
MAX17409GTI+
Ordering Information
TEMP RANGE
-40°C to +105°C
PIN-PACKAGE
28 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
DL
G5
16
G4
15
14
13
12
G3
G2
G1
G0
SHDN
PWRGD
TON
11
10
9
8
1
IMON
2
GNDS/OFSP
3
FB
4
CSN
5
CSP
6
SKIP
7
THRM
LX
TOP VIEW
21
DH 22
GND 23
VRHOT 24
REF 25
ILIM 26
V
CC
27
CCV 28
20
19
18
17
MAX17409
PAD
GND
THIN QFN
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PGND
BST
V
DD
1-Phase Quick-PWM GPU Controller
MAX17409
ABSOLUTE MAXIMUM RATINGS
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
G0–G5 to GND .........................................................-0.3V to +6V
CSP, CSN to GND ....................................................-0.3V to +6V
ILIM, THRM,
VRHOT,
PWRGD to GND ....................-0.3V to +6V
SKIP to GND.............................................................-0.3V to +6V
CCV, FB, IMON, REF to GND .....................-0.3V to (V
CC
+ 0.3V)
SHDN
to GND (Note 1)...........................................-0.3V to +30V
TON to GND ...........................................................-0.3V to +30V
GNDS/OFSP, PGND to GND (Note 2) ...................-0.3V to +0.3V
Internal Driver (Note 2)
DL to PGND .............................................-0.3V to (V
DD
+ 0.3V)
BST to GND .........................................................-0.3V to +36V
Note 1:
SHDN
might be forced to 12V for the purpose of debugging
ables fault protection.
Note 2:
Measurements valid using a 20MHz bandwidth limit.
LX to BST...............................................................-6V to +0.3V
BST to V
DD
..........................................................-0.3V to +30V
DH to LX .................................................-0.3V to (V
BST
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
28-Pin 4mm x 4mm TQFN
(derate 21.3mW/°C above +70°C) ............................1702mW
Operating Temperature Range .........................-40°C to +105°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
prototype breadboards using the no-fault test mode, which dis-
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
IN
= 12V, V
DD
= V
CC
= 5V,
SHDN
= ILIM = V
CC
, SKIP = GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.05V;
G5–G0 set for 1.05V (G0–G5 = 100110);
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
PWM CONTROLLER
Input Voltage Range
DC Output-Voltage Accuracy
Line Regulation Error
GNDS Input Range
GNDS/OFSP Gain
GNDS/OFSP Input Bias Current
REF Voltage
Dynamic VID Slew-Rate Accuracy
Soft-Start/Soft-Shutdown
Slew-Rate Accuracy
R
TON
= 96.75k
On-Time (Note 5)
Minimum Off-Time
TON Shutdown Input Current
t
ON
t
OFF(MIN)
V
IN
= 12V, V
FB
= 1.2V
R
TON
= 200k
R
TON
= 303.25k
Measured at DH (Note 5)
SHDN
= GND, V
IN
= 26V, V
CC
= V
DD
= 0 or 5V
A
GNDS
I
GNDS
V
REF
V
CC
= 4.5V to 5.5V, I
REF
= 100µA
I
REF
= 0 to 1mA
V
OUT
/ V
GNDS
, -200mV
V
GNDS
+200mV
V
CC
, V
DD
Measured at FB with respect to GNDS;
includes load-regulation error (Note 4)
V
CC
= 4.5V to 5.5V, V
IN
= 4.5V to 26V
-200
0.97
-2
1.98
1.97
11.0
1.248
142
300
425
2.000
2.000
12.5
1.56
167
333
500
300
0.01
1.00
4.5
-6
0.1
+200
1.03
+2
2.02
2.02
14.0
1.872
192
366
575
375
0.1
ns
µA
ns
5.5
+6
V
mV
%
mV
V/V
µA
V
mV/µs
mV/µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
1-Phase Quick-PWM GPU Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
SHDN
= ILIM = V
CC
, SKIP = GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.05V;
G5–G0 set for 1.05V (G0–G5 = 100110);
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
BIAS CURRENTS
Quiescent Supply Current (V
CC
)
Quiescent Supply Current (V
DD
)
Shutdown Supply Current (V
CC
)
Shutdown Supply Current (V
DD
)
FAULT PROTECTION
Skip mode after output reaches the
regulation voltage or PWM mode;
measured at FB with respect to unloaded
output voltage
V
OVP
Soft-start, soft-shutdown, skip mode, and
output have not reached the regulation
voltage; measured at FB
Minimum OVP threshold; measured at FB
Output Overvoltage Propagation
Delay
Output Undervoltage Protection
Threshold
Output Undervoltage
Propagation Delay
PWRGD Startup Delay
t
OVP
V
UVP
t
UVP
FB forced 25mV above trip threshold
Measured at FB with respect to unloaded
output voltage
FB forced 25mV below trip threshold
Measured at startup from the time when
SHDN
goes high
Measured at FB
with respect to
unloaded output
voltage, 15mV
hysteresis (typ)
t
BLANK
Lower threshold, falling
edge (undervoltage)
Upper threshold, rising
edge (overvoltage)
3
-350
-450
I
CC
I
DD
Measured at V
CC
, SKIP = 5V, FB forced
above the regulation point
Measured at V
DD
, SKIP = 0V, FB forced
above the regulation point, T
A
= +25°C
Measured at V
CC
,
SHDN
= GND, T
A
= +25°C
Measured at V
DD
,
SHDN
= GND, T
A
= +25°C
1.5
0.02
0.01
0.01
3
1
1
1
mA
µA
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX17409
250
300
350
mV
Output Overvoltage Protection
Threshold
1.45
1.50
0.8
10
-400
10
5
-300
1.55
V
µs
-350
mV
µs
8
-250
mV
ms
PWRGD Threshold
+150
+200
+250
PWRGD Transition Blanking
Time
PWRGD Delay
PWRGD Output Low Voltage
PWRGD Leakage Current
V
CC
Undervoltage-Lockout
Threshold
CSN Discharge Resistance
in UVLO
Measured from the time when FB reaches
the target voltage (Note 4) based on the
slew rate
FB forced 25mV outside the PWRGD trip
thresholds
I
SINK
= 3mA
High state, PWRGD forced to 5V
Rising edge, 50mV typical hysteresis,
controller disabled below this level
V
CC
= V
DD
= 4.0V
20
10
0.4
1
4.05
4.25
8
4.48
µs
µs
V
µA
V
V
UVLO(VCC)
_______________________________________________________________________________________
3
1-Phase Quick-PWM GPU Controller
MAX17409
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
SHDN
= ILIM = V
CC
, SKIP = GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.05V;
G5–G0 set for 1.05V (G0–G5 = 100110);
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
Measured at THRM with respect to V
CC
;
falling edge; typical hysteresis = 100mV
t
VRHOT
R
VRHOT
I
VRHOT
I
THRM
T
SHDN
THRM forced 25mV below the
VRHOT
trip
threshold; falling edge
Low state
High state,
VRHOT
forced to 5V, T
A
= +25°C
V
THRM
= 0 to 5V, T
A
= +25°C
Typical hysteresis = 15°C
V
REF
- V
ILIM
= 100mV
V
REF
- V
ILIM
= 500mV
7
45
20
-4
1
0
T
A
= +25°C
T
A
= +25°C
(V
CSP
- V
CSN
) at I
FB
= 0
I
FB
/ (V
CSP
- V
CSN
);
FB = CSN = 0.45V to 2.0V,
and (V
CSP
- V
CSN
) = -15.0mV to +15.0mV
BST - LX forced
to 5V
High state (pullup)
Low state (pulldown)
DH forced to 2.5V, BST - LX forced to 5V
DL forced to 2.5V
I
BST
= 10mA, V
DD
= 5V
High state (pullup)
Low state (pulldown)
-0.2
-100
-0.75
592
600
1.9
+0.2
+100
+0.75
608
-100
160
10
50
22.5
13
55
25
+4
MIN
TYP
MAX
UNITS
THERMAL COMPARATOR AND PROTECTION
VRHOT
Trip Threshold
VRHOT
Delay
VRHOT
Output On-Resistance
VRHOT
Leakage Current
THRM Input Leakage
Thermal-Shutdown Threshold
Current-Limit Threshold Voltage
(Positive Adjustable)
Current-Limit Threshold Voltage
(Positive Default)
Current-Limit Threshold Voltage
(Negative) Accuracy
Current-Limit Threshold Voltage
(Zero Crossing)
CSP, CSN Common-Mode
Input Range
CSP, CSN Input Current
ILIM Input Current
Droop Amplifier (GMD) Offset
Droop Amplifier (GMD)
Transconductance
GATE DRIVERS
DH Gate-Driver On-Resistance
DL Gate-Driver On-Resistance
DH Gate-Driver Source Current
DH Gate-Driver Sink Current
DL Gate-Driver Source Current
DL Gate-Driver Sink Current
Internal BST Switch
On-Resistance
R
ON(DH)
R
ON(DL)
0.9
0.7
0.7
0.25
2.2
2.7
2.7
8
10
20
2.5
2.0
2.0
0.7
A
A
A
A
29.2
30
10
2
8
1
+100
µA
nA
°C
30.8
%
µs
VALLEY CURRENT LIMIT AND DROOP
V
LIMIT
V
CSP
- V
CSN
mV
mV
mV
mV
V
µA
nA
mV
µS
ILIM = V
CC
, V
CSP
- V
CSN
V
LIMIT(NEG)
V
CSP
- V
CSN
, nominally -125% of V
LIMIT
V
ZERO
V
PGND
- V
LX
I
DH(SOURCE)
DH forced to 2.5V, BST - LX forced to 5V
I
DH(SINK)
I
DL(SINK)
R
BST
I
DL(SOURCE)
DL forced to 2.5V
4
_______________________________________________________________________________________
1-Phase Quick-PWM GPU Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
SHDN
= ILIM = V
CC
, SKIP = GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.05V;
G5–G0 set for 1.05V (G0–G5 = 100110);
T
A
= 0°C to +85°C,
unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
CURRENT MONITOR
Current-Monitor Transconductance
Current-Monitor Offset Referred
to V(CSP,CSN)
IMON Clamp Voltage
LOGIC AND I/O
Logic-Input High Voltage
Logic-Input Low Voltage
Low-Voltage Logic-Input
High Voltage
Low-Voltage Logic-Input
Low Voltage
Logic-Input Current
V
IH
V
IL
V
IHLV
V
ILLV
SHDN,
SKIP
SHDN,
SKIP
G0–G5
G0–G5
T
A
= +25°C,
SHDN,
SKIP, G0–G5 = 0 or 5V
-1
0.67
0.33
+1
2.3
1.0
V
V
V
V
µA
V
IMON
G
m(IMON)
I
IMON
/ (V
CSP
- V
CSN
), V
CSN
= 0.5V to 1.0V
I
IMON
= 0
I
IMON
= -1.0mA
4.9
-1.0
1.05
1.10
5.0
51
+1.0
1.15
mS
mV
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX17409
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
SHDN
= ILIM = V
CC
, SKIP = GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.05V;
G5–G0 set for 1.05V (G0–G5 = 100110);
T
A
= -40°C to +105°C,
unless otherwise specified.) (Note 3)
PARAMETER
PWM CONTROLLER
Input Voltage Range
DC Output-Voltage Accuracy
GNDS Input Range
GNDS/OFSP Gain
REF Voltage
Dynamic VID Slew-Rate Accuracy
Soft-Start/Soft-Shutdown
Slew-Rate Accuracy
R
TON
= 96.75k
On-Time (Note 5)
Minimum Off-Time
BIAS CURRENTS
Quiescent Supply Current (V
CC
)
I
CC
Measured at V
CC
, SKIP = 5V, FB forced
above the regulation point
3
mA
t
ON
t
OFF(MIN)
V
IN
= 12V, V
FB
= 1.2V
R
TON
= 200k
R
TON
= 303.25k
Measured at DH (Note 5)
A
GNDS
V
REF
V
CC
, V
DD
Measured at FB with respect to GNDS,
includes load regulation error (Note 4)
For positive offset and remote-sense errors
V
OUT
/ V
GNDS
, -200mV
V
GNDS
+200mV
V
CC
= 4.5V to 5.5V, I
REF
= 100µA
I
REF
= 0 to 1mA
4.5
-10
-200
0.95
1.97
1.95
10
1.248
142
300
425
5.5
+10
+200
1.05
2.03
2.03
15
1.872
192
366
575
400
ns
ns
V
mV
mV
V/V
V
mV/µs
mV/µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
5
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