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PDF MAX17007 Data sheet ( Hoja de datos )
| Número de pieza | MAX17007 | |
| Descripción | Dual and Combinable QPWM Graphics Core Controllers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3200; Rev 0; 2/08
EVAALVUAAILTAIOBNLEKIT
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
General Description
The MAX17007/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 oper-
ate in a two-phase single-output mode. Constant on-
time Quick-PWM operation provides fast response to
load transients and handles wide input/output (I/O) volt-
age ratios with ease, while maintaining a relatively con-
stant switching frequency. The switching frequency can
be individually adjusted between 200kHz and 600kHz
with external resistors. Differential output current sens-
ing allows output sense-resistor sensing for an accurate
current limit, or lossless inductor direct-current resis-
tance (DCR) current sensing for lower power dissipation
while maintaining 0.7% output accuracy. Overvoltage
(MAX17007 only), undervoltage protection, and accu-
rate 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 MAX17007/MAX17008 are available in a space-
saving, 28-pin, 4mm x 4mm, thin QFN package with an
exposed backside pad.
Applications
Notebook Computers
5V and 3.3V Supplies
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 (MAX17007 Only)
o Undervoltage/Thermal Protection
o Automatic Dynamic REFIN1 Detection and
PGOOD1/Fault Blanking
o Voltage Soft-Start and Soft-Shutdown
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17007GTI+
-40°C to +105°C
28 Thin QFN
MAX17008GTI+*
-40°C to +105°C
28 Thin QFN
+Denotes a lead-free package.
*Future product—contact factory for availability.
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
LX2 22
DH2 23
14 LX1
12 DH1
PGOOD2 24
EN2 25
CSH2 26
MAX17007
MAX17008
12 PGOOD1
11 EN1
10 CSH1
CSL2 27
9 CSL1
FB2 28
8 REFIN1
+
1234567
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.
1 page  
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, VDD = VCC = EN1 = EN2 = 5V, VREFIN1 = 2V, SKIP = GND, TA = 0 to +85°C, unless otherwise noted. Typical values are
at TA = +25°C.)
PARAMETER
DL_ Transition Time
DH_ Transition Time
Internal BST_ Switch
On-Resistance
LX_, BST_ Leakage Current
INPUTS AND OUTPUTS
EN1, EN2 Logic-Input Threshold
Logic-Input Current
Quad-Level Input-Logic Levels
Quad-Level Logic-Input Current
SYMBOL
CONDITIONS
DL_ falling, CDL = 3nF
DL_ rising, CDL = 3nF
DH_ falling, CDH = 3nF
DH_ rising, CDH = 3nF
RBST_ IBST_ = 10mA, VDD = 5V
VBST_ = VLX_ = 26V, TA = +25°C
EN1, EN2 rising edge,
hysteresis = 300mV/600mV (min/max)
EN1, EN2, TA = +25°C
High (5V)
SKIP, ILIM1, ILIM2 Open (3.3V)
Ref (2.0V)
Low (GND)
SKIP, ILIM1, ILIM2 forced to GND or VCC,
TA = +25°C
MIN TYP MAX UNITS
10 20
10 20
ns
10 20
10 20
ns
6.5 11.0
5 µA
1.20
-0.5
VCC -
0.4
3.0
1.7
1.70
-2
2.20
+0.5
3.6
2.3
0.4
+2
V
µA
V
µA
ELECTRICAL CHARACTERISTICS
(VIN = 12V, VDD = VCC = EN1 = EN2 = 5V, VREFIN1 = 2V, SKIP = GND, TA = -40°C to +105°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN MAX UNITS
PWM CONTROLLER
Input Voltage Range
VIN
4.5 26 V
Quiescent Supply Current
(VDD, VCC)
IDD + ICC
Output forced above regulation voltage,
EN1 = EN2 = 5V
2.5 mA
On-Time (Note 1)
tON1,
tON2
VIN = 12V,
VCSL1 = VCSL2 =
VCCI = 1.2V,
separate or
combined mode
RTON1 = RTON2 =
97.5k (600kHz)
RTON1 = RTON2 =
200k (300kHz)
RTON1 = RTON2 =
302.5k (200kHz)
142
305
425
194
368 ns
575
Minimum Off-Time
REFIN1 Voltage Range
FB2 Input Voltage Range
tOFF(MIN)
VREFIN1
(Note 1)
Preset mode
330 ns
0
VREF
V
1.7 2.3 V
FB2 Combined-Mode Threshold
Combined mode
3.75
VCC -
0.4
V
REFIN, FB2 Bias Current
IREFIN1,
IFB2
-0.1
+0.1
µA
_______________________________________________________________________________________ 5
5 Page 
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VDD = 5V, SKIP = GND, TA = +25°C, unless otherwise noted.)
DYNAMIC OUTPUT VOLTAGE
TRANSITION (PWM MODE)
MAX17007/8 toc26
1.2V IOUT1 = 2A
A
1V
REFIN1 = 1V
2A TO 1.2V TO 1V B
SKIP = 5V
12V
0
5V
0
C
D
20µs/div
A. VOUT1, 100mV/div
B. ILX1, 10A/div
C. LX1, 10V/div
D. DL1, 5V/div
DYNAMIC OUTPUT VOLTAGE
TRANSITION (SKIP MODE)
MAX17007/8 toc27
1.2V
A
1V
IOUT1 = 1A B
0
12V
REFIN1 = 1V
TO 1.2V TO 1V
C
0
5V
SKIP = GND
D
0
40µs/div
A. VOUT1, 100mV/div
B. ILX1, 10A/div
C. LX1, 10V/div
D. DL1, 5V/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
(SKIP MODE-FORCED TRANSITION)
MAX17007/8 toc28
1.2V IOUT1 = 3A
A
1V
0
REFIN1 = 1V TO 1.2V TO 1V
12V
0
5V
0
B
SKIP = REF
C
D
20µs/div
A. VOUT1, 100mV/div
B. ILX1, 10A/div
C. LX1, 10V/div
D. DL1, 5V/div
Pin Description
PIN NAME
FUNCTION
2V Reference Voltage Output. Bypass REF to GND with a 2.2nF ceramic capacitor. The reference can
1
REF
source up to 100µA. Loading REF degrades output-voltage accuracy according to the REF load
regulation error (see theTypical Operating Characteristics). The reference shuts down when both EN1
and EN2 are low.
This four-level input determines the CSH1 to CSL1 current limit for SMPS1:
VDD (5V) = 60mV current limit
2
ILIM1
Open (3.3V) = 45mV current limit
REF (2V) = 30mV current limit
GND = 15mV current limit
In combined mode, ILIM1 sets the current-limit threshold for both sides.
This four-level input determines the CSH2 to CSL2 current limit for SMPS2:
VCC (5V) = 60mV current limit
Open (3.3V) = 45mV current limit
REF (2V) = 30mV current limit
GND = 15mV current limit
In combined mode, ILIM2 is the current balance integrator (CCI) output pin. Connect a capacitor
3
ILIM2
(CCCI) between CCI and the output. The CCI capacitor value depends on the ILIM1 setting based on
(CCI)
the following table:
ILIM1
VCC (5V)
Open (3.3V)
REF (2V)
GND
CCCI at ILIM2 (pF)
120
180
220
470
4
VCC
5V Analog Supply Input. Bypass VCC from VDD using a 10_ resistor, and to analog ground using a
1µF ceramic capacitor.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX17007.PDF ] | |
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