19-3200; Rev 3; 9/10
KIT
ATION
EVALU
E
BL
AVAILA
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
MAX17007A/MAX17007B/MAX17008
General Description
Features
o
Dual Quick-PWM with Fast Transient Response
o
Automatic Dynamic REFIN1 Detection and
PGOOD1/Fault Blanking
o
Fixed and Adjustable Output Voltages
±0.7% Output Accuracy Over Line and Load
OUT1: 0 to 2V Dynamic Output or Preset 1.05V
OUT2: 0.7V to 2V Range or Preset 1.5V
o
Resistor-Programmable Switching Frequency
o
Integrated BST Switches
o
Differential Current-Sense Inputs
Low-Cost DCR Sensing or Accurate Current-
Sense Resistors
Internally Coupled Current-Sense Compensation
o
Combinable Mode Supports High-Current
Dynamic Output Voltages
o
Selectable Forced-PWM, Pulse Skip, or Ultrasonic
Mode Operation
o
26V Maximum Input Voltage Rating
o
Independent Enable Inputs
o
Independent Power-Good Outputs
o
Overvoltage Protection (MAX17007A/MAX17007B
Only)
o
Undervoltage/Thermal Protection
o
Voltage Soft-Start and Soft-Shutdown
The MAX17007A/MAX17007B/MAX17008 are dual Quick-
PWM™ step-down controllers intended for general power
generation in battery-powered systems. The two
switched-mode power supplies (SMPSs) can also be
combined to operate in a two-phase single-output mode.
Constant on-time Quick-PWM operation provides fast
response to load transients and handles wide input/out-
put (I/O) voltage ratios with ease, while maintaining a rela-
tively constant switching frequency. The switching
frequency can be individually adjusted between 200kHz
and 600kHz with external resistors. Differential output cur-
rent sensing allows output sense-resistor sensing for an
accurate current limit, or lossless inductor direct-current
resistance (DCR) current sensing for lower power dissipa-
tion while maintaining 0.7% output accuracy. Overvoltage
(MAX17007A/MAX17007B only), undervoltage protection,
and accurate user-selectable current limits (15mV, 30mV,
45mV, and 60mV) ensure robust operations.
The SMPS outputs can operate in skip mode or in ultra-
sonic mode for improved light-load efficiency. The ultra-
sonic mode eliminates audible noises by maintaining a
minimum switching frequency of 25kHz in pulse-
skipping mode.
The output voltage of SMPS1 can be dynamically
adjusted by changing the voltage at the REFIN1 pin.
The device includes a 0.5% accurate reference output
that can be used to set the REFIN1 voltage. An external
5V bias supply is required to power the internal circuitry
and its gate drivers.
Independent on/off controls with well-defined logic thresh-
olds and independent open-drain power-good outputs
provide flexible system configurations. To prevent current
surges at startup, the internal voltage target is slowly
ramped up from zero to the final target with a slew rate of
1.3mV/µs for SMPS1 at CSL1 and 0.65mV/µs for SMPS2
at FB2. To prevent the output from ringing off below
ground in shutdown, the internal voltage target is ramped
down from its previous value to zero with the same
respective slew rates. Integrated bootstrap switches
eliminate the need for external bootstrap diodes.
The MAX17007A/MAX17007B/MAX17008 are available
in a space-saving, 28-pin, 4mm x 4mm, TQFN package
with an exposed backside pad. The MAX17007B
improves crosstalk performance over the MAX17007A.
Ordering Information
PART
MAX17007AGTI+
MAX17007BGTI+
TEMP RANGE
-40°C to +105°C
-40°C to +105°C
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
MAX17008GTI+
-40°C to +105°C
28 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
PGND
BST2
TOP VIEW
21
LX2 22
DH2 23
PGOOD2 24
EN2 25
CSH2 26
CSL2 27
FB2 28
+
1
REF
2
ILIM1
3
(CCI) ILIM2
4
V
CC
5
SKIP
6
TON1
7
TON2
20
19
18
17
16
15
14 LX1
13 DH1
12 PGOOD1
BST1
11 EN1
10 CSH1
9 CSL1
8 REFIN1
GND
DL2
DL1
V
DD
MAX17007A
MAX17007B
MAX17008
Applications
Notebook Computers
Low-Power I/O Supplies
GPU Core Supplies
2 to 4 Li+ Cells Battery-
Powered Devices
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
THIN QFN
(4mm x 4mm)
________________________________________________________________
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.
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
MAX17007A/MAX17007B/MAX17008
ABSOLUTE MAXIMUM RATINGS
BST1, BST2 to GND ...............................................-0.3V to +34V
BST1, BST2 to V
DD
.................................................-0.3V to +28V
TON1, TON2 to GND..............................................-0.3V to +28V
V
DD
to GND ..............................................................-0.3V to +6V
V
DD
to V
CC
............................................................-0.3V to +0.3V
LX1 to BST1..............................................................-6V to +0.3V
LX2 to BST2..............................................................-6V to +0.3V
DH1 to LX1 ..............................................-0.3V to (V
BST1
+ 0.3V)
DH2 to LX2 ..............................................-0.3V to (V
BST2
+ 0.3V)
ILIM1, ILIM2, REF to GND ..........................-0.3V to (V
CC
+ 0.3V)
CSH1, CSH2, CSL1, CSL2, FB2, REFIN1 to GND....-0.3V to +6V
EN1, EN2,
SKIP,
PGOOD1, PGOOD2 to GND.........-0.3V to +6V
DL1 to GND ................................................-0.3V to (V
DD
+ 0.3V)
DL2 to PGND..............................................-0.3V to (V
DD
+ 0.3V)
PGND to GND ......................................................-0.3V to + 0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TQFN T2844-1
(derate 20.8mW/°C above +70°C) ............................1667mW
Extended Operating Temperature Range .........-40°C to +105°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature ....................................................+260°C
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
(V
IN
= 12V, V
DD
= V
CC
= V
EN1
= V
EN2
= 5V, V
REFIN1
= 2V,
SKIP
= GND,
T
A
= 0 to +85°C,
unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
Quiescent Supply Current
(V
DD
, V
CC
)
Shutdown Supply Current
(V
DD
, V
CC
)
V
IN
I
DD
+ I
CC
I
SHDN
Output forced above regulation voltage,
V
EN1
= V
EN2
= 5V
EN1 = EN2 = GND, T
A
= +25°C
V
IN
= 12V,
V
CSL1
= V
CSL2
=
V
CCI
= 1.2V,
separate or
combined mode
(Note 1)
EN1 = EN2 = GND, V
TON1
= V
TON2
= 26V,
V
DD
= 0 or 5V, T
A
= +25°C
(Note 2)
Adjustable mode
Preset mode
Combined mode
1.7
3.8
3.8
I
REFIN1
,
I
FB2
V
CSL1
SMPS1 Voltage Accuracy
V
CSL1
-
V
REFIN1
REFIN1 = 0.5V to 2V;
V
FB2
= 0.7V, T
A
= +25°C
Measured at CSL1, REFIN1 = V
CC
,
V
IN
= 2V to 26V,
SKIP
= V
CC
(Note 2)
REFIN1 = 500mV,
SKIP
= V
CC
T
A
= +25°C
T
A
= 0°C to +85°C
-0.1
1.043
-12
-20
-20
1.05
V
CC
-
1V
V
CC
-
1V
0
0.7
2.3
V
CC
-
0.4
V
CC
-
0.4
+0.1
1.057
+12
+20
+20
mV
R
TON1
= R
TON2
=
97.5k (600kHz)
R
TON1
= R
TON2
=
200k (300kHz)
R
TON1
= R
TON2
=
302.5k (200kHz)
142
(-15%)
305
(-10%)
425
(-15%)
4.5
1.7
0.1
174
336
500
250
0.01
26
2.5
5
194
(+15%)
368
(+10%)
575
(+15%)
400
1
V
REF
ns
µA
V
V
V
V
V
µA
V
ns
V
mA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Time (Note 1)
t
ON1
, t
ON2
Minimum Off-Time
TON1, TON2, Shutdown Supply
Current
REFIN1 Voltage Range
FB2 Regulation Voltage
FB2 Input Voltage Range
FB2 Combined-Mode Threshold
REFIN1 Dual Mode™
Switchover Threshold
REFIN1, FB2 Bias Current
t
OFF(MIN)
I
TON1
,
I
TON2
V
REFIN1
V
FB2
REFIN1 = 2V,
SKIP
= V
CC
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
_______________________________________________________________________________________
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
DD
= V
CC
= V
EN1
= V
EN2
= 5V, V
REFIN1
= 2V,
SKIP
= GND,
T
A
= 0 to +85°C,
unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
SMPS2 Voltage Accuracy
Load Regulation Error
Line Regulation Error
CSL1 Soft-Start/-Stop Slew Rate
FB2 Soft-Start/-Stop Slew Rate
Dynamic REFIN1 Slew Rate
INTERNAL REFERENCE
Reference Voltage
Reference Lockout Voltage
Reference Load Regulation
FAULT DETECTION
SMPS1 Overvoltage Trip
Threshold and PGOOD1 Upper
Threshold
(MAX17007A Only)
SMPS2 Adjustable Mode
Overvoltage Trip Threshold and
PGOOD2 Upper Threshold
(MAX17007A Only)
Output Overvoltage Fault
Propagation Delay
(MAX17007A Only)
SMPS1 Undervoltage Protection
Trip Threshold and Lower
PGOOD1 Threshold
SMPS2 Undervoltage Protection
Trip Threshold and Lower
PGOOD2 Threshold
Output Undervoltage Fault
Propagation Delay
PGOOD_ Propagation Delay
PGOOD_ Output Low Voltage
PGOOD_ Leakage Current
Dynamic REFIN1 Transition
Fault-Blanking Threshold
Thermal-Shutdown Threshold
V
CC
Undervoltage Lockout
Threshold
T
SHDN
V
UVLO(VCC)
I
PGOOD
With respect to the internal target voltage
(error comparator threshold); rising edge;
hysteresis = 50mV
Dynamic transition
Minimum OVP threshold
V
OVP2
,
V
PG2_H
With respect to the internal target voltage
0.7V (error comparator threshold);
hysteresis = 50mV
CSL1/FB2 forced 25mV above trip threshold
With respect to the internal target voltage
(error comparator threshold); falling edge;
hysteresis = 50mV
With respect to the internal target voltage
0.7V (error comparator threshold);
falling edge; hysteresis = 50mV
CSL1/FB2 forced 25mV below trip threshold
UVP falling edge, 25mV overdrive
t
PGOOD
OVP rising edge, 25mV overdrive
Startup delay from regulation
I
SINK
= 3mA
CSL1 = REFIN1, FB2 = 0.7V (PGOOD_ high
impedance), PGOOD_ forced to 5V, T
A
= +25°C
Fault blanking initiated; REFIN1 deviation
from the internal target voltage (error
comparator threshold); hysteresis = 10mV
Hysteresis = 15°C (Note 3)
Rising edge, PWM disabled below this level,
hysteresis = 100mV
3.95
±50
160
4.20
4.45
90
120
260
300
V
REF
+ 0.30
0.7
150
180
340
mV
V
V
mV
V
REF
V
REF(UVLO)
V
DD
= 4.5V to 5.5V
Rising edge, hysteresis = 230mV
I
REF
= -10µA to +100µA
1.980
1.990
2.000
1.8
2.015
2.010
V
V
mV
SR
SS1
SR
SS2
SR
DYN
SYMBOL
V
CSL2
CONDITIONS
Measured at CSL2, FB2 = REF,
V
IN
= 2V to 26V,
SKIP
= V
CC
I
LOAD
= 0 to full load,
SKIP
= V
CC
(Note 3)
V
DD
= 4.5V to 5.5V, V
IN
= 4.5V to 26V (Note 3)
Rising/falling edge on EN1
Rising/falling edge on EN2
Rising edge on REFIN1
MIN
1.489
TYP
1.5
0.1
0.25
1.25
0.63
11.4
MAX
1.511
UNITS
V
%
%
mV/µs
mV/µs
mV/µs
MAX17007A/MAX17007B/MAX17008
V
OVP1
,
V
PG1_H
t
OVP
V
UVP1
,
V
PG1_L
V
UVP2
,
V
PG2_L
t
UVP
5
µs
-240
-200
-160
mV
-130
90
-100
205
5
5
205
-70
360
mV
µs
µs
360
0.4
1
V
µA
mV
°C
V
_______________________________________________________________________________________
3
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
MAX17007A/MAX17007B/MAX17008
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
DD
= V
CC
= V
EN1
= V
EN2
= 5V, V
REFIN1
= 2V,
SKIP
= GND,
T
A
= 0 to +85°C,
unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
CURRENT LIMIT
Current-Sense Input Range
Current-Sense Input (CSH_)
Leakage Current
Current-Sense Input (CSL_)
Leakage Current
CSH1, CSH2
CSL1, CSL2
CSH_ = GND or V
CC
, T
A
= +25°C
CSL_= CSL_ = 2V, T
A
= +25°C
T
A
= +25°C
V
CSH_
- V
CSL_
ILIM1 = ILIM2 = REF T
A
= 0°C to +85°C
Current-Limit Threshold (Fixed)
V
CSLIMIT
V
CSH_
- V
CSL_
, ILIM1 = ILIM2 = V
CC
V
CSH_
- V
CSL_
, ILIM1 = ILIM2 = OPEN
V
CSH_
- V
CSL_,
ILIM1 = ILIM2 = GND
Current-Limit Threshold
(Negative)
Current-Limit Threshold
(Zero Crossing)
Ultrasonic Frequency
Ultrasonic Current-Limit
Threshold
Current-Balance Amplifier (GMI)
Offset
Current-Balance Amplifier (GMI)
Transconductance
GATE DRIVERS
DH1, DH2 Gate-Driver
On-Resistance
DL1, DL2 Gate-Driver
On-Resistance
DH1, DH2 Gate-Driver
Source/Sink Current
DL1, DL2 Gate-Driver
Source Current
DL1, DL2 Gate-Driver
Sink Current
Driver Propagation Delay
R
ON(DH)
R
ON(DL)
I
DH
BST_ - LX_ forced
to 5V
High state (pullup)
Low state (pulldown)
DH_ forced to 2.5V, BST_ - LX_ forced to
5V
Low state (pulldown)
High state (pullup)
1.7
1.7
1.3
0.6
1.2
1
2.4
10
15
25
30
40
45
4.0
4.0
3.0
2.5
A
A
A
ns
V
NEG
V
ZX
V
CSH_
- V
CSL_
,
SKIP
= V
CC
V
CSH_
- V
CSL_
,
SKIP
= GND or OPEN;
ILIM1 = ILIM2 = REF
SKIP
= open (3.3V); V
CSL1
= V
REFIN1
+ 50mV;
V
CSL2
= V
FB2
+ 50mV
SKIP
= open (3.3V)
V
CSL1
= V
REF1
+ 50mV
V
CSL2
= V
FB2
+ 50mV
20
22
18
-3
33
30
46
46
+3
28
27
56
42
13
30
30
60
45
15
-1.2 x
V
CSLIMIT
1
0
0
-0.2
2.3
2.3
+0.2
1
32
33
64
48
17
mV
mV
kHz
mV
mV
mV
V
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
[V(CSH1,CSL1) - V(CSH2,CSL2)] at I
CCI
= 0
I
CCI
/ [V(CSH1,CSL1) - V(CSH2,CSL2)];
V
CCI
= V
CSL1
= V
CSL2
= 0.5V to 2V, and
V(CSH_,CSL_) = -60.0mV to +60.0mV,
ILIM1 = GND
180
µS
I
DL(SOURCE)
DL_ forced to 2.5V
I
DL(SINK)
DL_ forced to 2.5V
DH_ low to DL high
DL_ low to DH high
4
_______________________________________________________________________________________
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
DD
= V
CC
= V
EN1
= V
EN2
= 5V, V
REFIN1
= 2V,
SKIP
= GND,
T
A
= 0 to +85°C,
unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
DL_ Transition Time
DH_ Transition Time
Internal BST_ Switch
On-Resistance
INPUTS AND OUTPUTS
EN1, EN2 Logic-Input Threshold
Logic-Input Current
EN1, EN2 rising edge,
hysteresis = 300mV/600mV (min/max)
EN1, EN2, T
A
= +25°C
High (5V)
Quad-Level Input-Logic Levels
SKIP,
ILIM1, ILIM2
Open (3.3V)
Ref (2.0V)
Low (GND)
Quad-Level Logic-Input Current
SKIP,
ILIM1, ILIM2 forced to GND or V
CC
,
T
A
= +25°C
-2
1.20
-0.5
V
CC
-
0.3
3.0
1.7
3.6
2.3
0.4
+2
µA
V
1.70
2.20
+0.5
V
µA
R
BST_
SYMBOL
CONDITIONS
DL_ falling, C
DL
= 3nF
DL_ rising, C
DL
= 3nF
DH_ falling, C
DH
= 3nF
DH_ rising, C
DH
= 3nF
I
BST_
= 10mA, V
DD
= 5V
MIN
10
10
10
10
TYP
20
20
20
20
6.5
11.0
MAX
UNITS
ns
ns
MAX17007A/MAX17007B/MAX17008
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, V
DD
= V
CC
= V
EN1
= V
EN2
= 5V, V
REFIN1
= 2V,
SKIP
= GND,
T
A
= -40°C to +105°C,
unless otherwise noted.) (Note 4)
PARAMETER
PWM CONTROLLER
Input Voltage Range
Quiescent Supply Current
(V
DD
, V
CC
)
V
IN
I
DD
+ I
CC
Output forced above regulation voltage,
V
EN1
= V
EN2
= 5V
V
IN
= 12V,
V
CSL1
= V
CSL2
=
V
CCI
= 1.2V,
separate or
combined mode
(Note 1)
0
Preset mode
Combined mode
I
REFIN1
,
I
FB2
1.7
3.75
-0.1
R
TON1
= R
TON2
=
97.5k (600kHz)
R
TON1
= R
TON2
=
200k (300kHz)
R
TON1
= R
TON2
=
302.5k (200kHz)
142
305
425
4.5
26
2.5
194
368
575
400
V
REF
2.3
V
CC
-
0.4
+0.1
ns
V
V
V
µA
ns
V
mA
SYMBOL
CONDITIONS
MIN
MAX
UNITS
On-Time (Note 1)
t
ON1
,
t
ON2
Minimum Off-Time
REFIN1 Voltage Range
FB2 Input Voltage Range
FB2 Combined-Mode Threshold
REFIN1, FB2 Bias Current
t
OFF(MIN)
V
REFIN1
_______________________________________________________________________________________
5
京公网安备 11010802033920号
EEWORLD
