MAX1993 Datasheet PDF - Maxim Integrated


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MAX1993
Maxim Integrated

Part Number MAX1993
Description Quick-PWM Step-Down Controllers
Page 30 Pages

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19-2661; Rev 1; 9/05
Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
General Description
The MAX1992/MAX1993 pulse-width modulation (PWM)
controllers provide high-efficiency, excellent transient
response, and high DC output accuracy. The devices
step down high-voltage batteries to generate low-
voltage CPU core or chipset/RAM supplies in notebook
computers.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant 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 switching frequency. Efficiency is
enhanced by the ability to drive very large synchronous-
rectifier MOSFETs. Current sensing to ensure reliable
overload and inductor saturation protection is available
using an external current-sense resistor in series with the
output. Alternatively, the controller can sense the current
across the synchronous rectifier alone or use lossless
inductor sensing for lowest power dissipation.
Single-stage buck conversion allows the MAX1992/
MAX1993 to directly step down high-voltage batteries for
the highest possible efficiency. Alternatively, two-stage
conversion (stepping down from another system supply
rail instead of the battery) at the maximum switching fre-
quency allows the minimum possible physical size.
The MAX1992 powers the CPU core, chipset, DRAM, or
other supply rails as low as 0.7V. The MAX1993 powers
chipsets and graphics processor cores, which require
dynamically adjustable output voltages. The MAX1993
provides a tracking input that can be used for active ter-
mination buses. The MAX1992/MAX1993 are available in
a 24-pin thin QFN package with optional overvoltage and
undervoltage protection.
For dual step-down PWM controllers with inductor satu-
ration protection, external reference input voltage, and
dynamically selectable output voltages, refer to the
MAX1540/MAX1541 data sheet.
Applications
Notebook Computers
Core/IO Supplies as Low as 0.7V
1.8V and 2.5V Supplies
DDR Memory Termination (MAX1993)
Active Termination Buses (MAX1993)
CPU/Chipset/GPU with Dynamic Voltage Cores
(MAX1993)
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Features
Inductor Saturation Protection
Accurate Current Limit
Ultra-High Efficiency
Quick-PWM with 100ns Load-Step Response
MAX1992
1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable
Output Range
MAX1993
External Reference Input
Dynamically Selectable Output Voltage
(0.7V to 5.5V)
Optional Power-Good and Fault Blanking
During Transitions
±1% VOUT Accuracy Over Line and Load
2V to 28V Battery Input Range (VIN)
200/300/450/600kHz Switching Frequency
Overvoltage/Undervoltage Protection Option
1.7ms Digital Soft-Start
Drives Large Synchronous Rectifier FETs
2V ±0.7% Reference Output
Power-Good Window Comparator
Ordering Information
PART
MAX1992ETG
MAX1992ETG+
MAX1993ETG
MAX1993ETG+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 Thin QFN 4mm × 4mm
24 Thin QFN 4mm × 4mm
24 Thin QFN 4mm × 4mm
24 Thin QFN 4mm × 4mm
+ Denotes lead-free package.
Pin Configurations
TOP VIEW
18 17 16 15 14 13
VDD 19
12 CSN
PGND 20
11 CSP
AGND 21
VCC 22
MAX1992
10 OUT
9 FB
SHDN 23
8 N.C.
OVP/UVP 24
7 N.C
1 23 45 6
THIN QFN
4mm x 4mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



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Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
ABSOLUTE MAXIMUM RATINGS (Note 1)
V+ to AGND............................................................-0.3V to +30V
VCC to AGND............................................................-0.3V to +6V
VDD to PGND............................................................-0.3V to +6V
PGOOD, ILIM, SKIP, SHDN to AGND ......................-0.3V to +6V
REFIN, FB, CSP to AGND.........................................-0.3V to +6V
GATE, OD to GND (MAX1993 only) .........................-0.3V to +6V
TON, OVP/UVP, LSAT to AGND .................-0.3V to (VCC + 0.3V)
REF, OUT to AGND ....................................-0.3V to (VCC + 0.3V)
FBLANK to GND (MAX1993 only) ..............-0.3V to (VCC + 0.3V)
DL to PGND................................................-0.3V to (VDD + 0.3V)
CSN to AGND............................................................-2V to +30V
DH to LX .....................................................-0.3V to (BST + 0.3V)
LX to AGND ...............................................................-2V to +30V
BST to LX..................................................................-0.3V to +6V
AGND to PGND (MAX1992 only) ..........................-0.3V to +0.3V
REF Short Circuit to AGND.........................................Continuous
Continuous Power Dissipation (TA = +70°C)
24-Pin 4mm x 4mm Thin QFN
(derated 20.8mW/°C above +70°C)...........................1667mW
Operating Temperature Range
MAX199_ETG ..................................................-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: For the MAX1993, AGND and PGND refer to a single pin designated GND.
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+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
SYMBOL
CONDITIONS
VIN
VBIAS
Battery voltage, V+
VCC, VDD
MIN TYP MAX UNITS
2 28
V
4.5 5.5
Output Voltage Accuracy
(MAX1992 Fixed)
VOUT
MAX1992
V+ = 4.5V to 28V,
SKIP = VCC
(Note 2)
FB = GND
FB = VCC
2.475 2.5 2.525
1.782 1.8 1.818
V
Feedback Voltage Accuracy
(MAX1992 Adjustable)
VFB
MAX1992 V+ = 4.5V to 28V, SKIP = VCC
(Note 2)
0.693 0.7 0.707
V
Feedback Voltage Accuracy
(MAX1993)
MAX1993
REFIN = 0.35 × REF
0.693 0.7 0.707
V+ = 4.5V to 28V,
VFB SKIP = VCC
(Note 2)
REFIN = REF
1.980 2 2.020
Load Regulation Error
Line Regulation Error
FB Input Bias Current
Output Adjust Range
OUT Input Resistance
IFB
ROUT
ILOAD = 0 to 3A, SKIP = VCC
VCC = 4.5V to 5.5V, V+ = 4.5V to 28V
MAX1992
MAX1993
FB = GND
FB = VCC or adjustable
-0.1
0.7
90
70
400
0.1
0.25
+0.1
5.5
190 350
145 270
800 1400
OUT Discharge Mode
On-Resistance
RDISCHARGE
10 25
OUT Synchronous Rectifier
Discharge Mode Turn-On Level
Soft-Start Ramp Time
tSS Rising edge on SHDN to full current limit
0.2 0.3 0.4
1.7
V
%
%
µA
V
kΩ
Ω
V
ms
2 _______________________________________________________________________________________



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Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
On-Time
Minimum Off-Time
Quiescent Supply Current (VCC)
Quiescent Supply Current (VDD)
Quiescent Supply Current (V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
Shutdown Supply Current (V+)
REFERENCE
Reference Voltage
Reference Load Regulation
REF Lockout Voltage
REFIN Voltage Range
REFIN Input Bias Current
FAULT DETECTION
Overvoltage Trip Threshold
Overvoltage Fault Propagation
Delay
Output Undervoltage Protection
Trip Threshold
Output Undervoltage Protection
Blanking Time
Output Undervoltage Fault
Propagation Delay
PGOOD Lower Trip Threshold
PGOOD Upper Trip Threshold
PGOOD Propagation Delay
SYMBOL
tON
tOFF(MIN)
ICC
IDD
IV+
V+ = 15V,
VOUT = 1.5V
(Note 3)
(Note 3)
CONDITIONS
TON = GND (600kHz)
TON = REF (450kHz)
TON = open (300kHz)
TON = VCC (200kHz)
FB forced above the regulation point,
LSAT = GND
FB forced above the regulation point,
VLSAT > 0.5V
FB forced above the regulation point
SHDN = GND
SHDN = GND
SHDN = GND, V+ = 28V,
VCC = VDD = 0 or 5V
MIN
170
213
316
461
VREF
VCC = 4.5V to 5.5V, TA = +25°C to +85°C
IREF = 0
TA = 0°C to +85°C
ΔVREF IREF = -10µA to 50µA
VREF(UVLO) Rising edge, hysteresis = 350mV
IREFIN
1.986
1.983
-0.01
0.7
tOVP
tBLANK
With respect to error comparator threshold,
OVP/UVP = VCC
FB forced 2% above trip threshold
With respect to error comparator threshold,
OVP/UVP = VCC
From rising edge of SHDN
12
65
10
tUVP
tPGOOD
With respect to error comparator threshold,
hysteresis = 1%
With respect to error comparator threshold,
hysteresis = 1%
FB forced 2% beyond PGOOD trip
threshold
-13
+7
TYP
194
243
352
516
400
0.55
<1
25
<1
<1
<1
2
2
1.95
0.01
16
10
70
10
-10
+10
10
MAX
219
273
389
571
500
UNITS
ns
ns
0.85
mA
1
5 µA
40 µA
7 µA
5 µA
5 µA
2.014
2.017
+0.01
VREF
0.05
V
V
V
V
µA
20 %
µs
75 %
35 ms
µs
-7 %
+13 %
µs
_______________________________________________________________________________________ 3



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Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, VCC = VDD = SHDN = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
PGOOD Output Low Voltage
ISINK = 4mA
0.3 V
PGOOD Leakage Current
Fault Blanking Time
Thermal Shutdown Threshold
VCC Undervoltage Lockout
Threshold
CURRENT LIMIT
ILIM Adjustment Range
Current-Limit Input Range
CSP/CSN Input Current
Valley Current-Limit Threshold
(Fixed)
Valley Current-Limit Threshold
(Adjustable)
Current-Limit Threshold
(Negative)
IPGOOD
FB = REF (PGOOD high impedance),
PGOOD forced to 5.5V
tFBLANK
FBLANK = VCC
FBLANK = open
FBLANK = REF
TSHDN Hysteresis = 15°C
VUVLO(VCC)
Rising edge, PWM disabled below this level
hysteresis = 20mV
CSP
CSN
VLIM(VAL) VCSP - VCSN, ILIM = VCC
VLIM(VAL)
VNEG
VCSP - VCSN
VILIM = 250mV
VILIM = 2.00V
VCSP - VCSN, SKIP = ILIM = VCC,
TA = +25°C
Current-Limit Threshold
(Zero Crossing)
With respect to valley current-limit
VZX threshold, VCSP - VCSN, SKIP = GND,
ILIM = VCC
Inductor Saturation Current-Limit
Threshold
With respect to
valley current-limit
threshold,
ILIM = VCC
LSAT = VCC
LSAT = open
LSAT = REF
ILIM Saturation Fault Sink Current
IILIM(LSAT)
VCSP - VCSN > inductor saturation current
limit, 0.25V < VILIM < 2.0V
ILIM Leakage Current
VCSP - VCSN < inductor saturation current
limit
GATE DRIVERS
DH Gate Driver On-Resistance
DL Gate Driver On-Resistance
RDH BST - LX forced to 5V
DL, high state
RDL DL, low state
DH Gate Driver Source/Sink
Current
IDH DH forced to 2.5V, BST - LX forced to 5V
DL Gate Driver Source Current IDL(SOURCE) DL forced to 2.5V
120
80
35
4.1
0.25
0
-0.3
-0.5
45
15
170
-75
180
157
135
4
1
218 320
140 205
63 95
160
4.25 4.4
2.00
2.7
+28.0
+0.5
50 55
25 35
200 230
-60 -45
2.5
200 220
175 193
150 165
68
0.1
1.5 5
1.5 5
0.6 3
1
1
µA
µs
°C
V
V
V
µA
mV
mV
mV
mV
%
µA
µA
Ω
Ω
A
A
4 _______________________________________________________________________________________




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