
M
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
V+ to GND..............................................................-0.3V to +30V
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
D0–D4, A/
B,
VGATE, to GND ..................................-0.3V to +6V
SKP/
SDN
to GND ...................................................-0.3V to +16V
ILIM, FB, FBS, CC, REF, GNDS,
TON, TIME to GND.................................-0.3V to (V
CC
+ 0.3V)
DL to GND..................................................-0.3V to (V
DD
+ 0.3V)
BST to GND............................................................-0.3V to +36V
DH to LX.....................................................-0.3V to (BST + 0.3V)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = +15V, V
CC
= V
DD
= SKP/
SDN
= +5V, V
OUT
= 1.6V,
T
A
= 0°C to +85°C
, unless otherwise noted.)
CONDITIONS
PARAMETER
PWM CONTROLLER
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.
LX to BST..................................................................-6V to +0.3V
REF Short Circuit to GND...........................................Continuous
Continuous Power Dissipation
24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
V
CC
= 4.5V to 5.5V, no REF load
SKP/
SDN
= 0, V
CC
= V
DD
= 0 or 5V
SKP/
SDN
= 0
SKP/
SDN
= 0
V
CC
, V
DD
Measured at V
DD
, FB forced above the regulation point
Battery voltage, V+
Measured at V
CC
, FB forced above the regulation point
TON = GND (1000kHz)
TON = V
CC
, open, or REF (200kHz, 300kHz, or 550kHz)
38kHz nominal, R
TIME
= 470k
V+ = 5V, FB = 2V, TON = GND (1000kHz)
380kHz nominal, R
TIME
= 47k
150kHz nominal, R
TIME
= 120k
TON = V
CC
(200kHz)
FB to FBS or GNDS to GND = 0 to 25mV
V
CC
= 4.5V to 5.5V, V
BATT
= 4.5V to 28V
V+ = 24V, FB = 2V
V
1.98
2
2.02
DAC codes from 1.3V to 2V
Reference Voltage
μA
<1
5
%
Shutdown Battery Supply
Current (V+)
μA
<1
5
-1
1
Shutdown Supply Current (V
DD
)
μA
2
5
Shutdown Supply Current (V
CC
)
μA
25
40
DAC codes from 0.925V to 1.275V
Quiescent Battery Supply
Current (V+)
μA
<1
5
-1.2
1.2
Quiescent Supply Current (V
DD
)
μA
700
1200
TON = open (300kHz)
Quiescent Supply Current (V
CC
)
ns
300
375
TON = REF (550kHz)
Minimum Off-Time (Note 2)
BIAS AND REFERENCE
ns
400
500
Minimum Off-Time (Note 2)
375
418
461
260
289
318
135
155
173
ns
375
425
475
On-Time (Note 2)
4.5
5.5
V
2
28
Input Voltage Range
-12
+12
%
-12
+12
-8
+8
TIME Frequency Accuracy
μA
-1
1
GNDS Input Bias Current
mV
mV
k
μA
3
5
Remote Sense Voltage Error
Line Regulation Error
FB Input Resistance
FBS Input Bias Current
115
-0.2
180
265
0.2
UNITS
MIN
TYP
MAX
%
V+ = 4.5V to 28V,
includes load
regulation error
DC Output Voltage Accuracy
(Note 1)