MAX17007A_10 Datasheet, PDF (1/36 Pages) Maxim Integrated Products – Dual and Combinable QPWM Graphics Core Controllers for Notebook Computers

19-3200; Rev 3; 9/10
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Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
General Description
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.
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.
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17007AGTI+ -40°C to +105°C 28 TQFN-EP*
MAX17007BGTI+ -40°C to +105°C 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
TOP VIEW
21 20 19 18 17 16 15
LX2 22
14 LX1
DH2 23
13 DH1
PGOOD2 24
EN2 25
CSH2 26
MAX17007A
MAX17007B
MAX17008
12 PGOOD1
11 EN1
10 CSH1
CSL2 27
9 CSL1
FB2 28
8 REFIN1
+
1234567
THIN QFN
(4mm x 4mm)
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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.