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PDF MAX17085B Data sheet ( Hoja de datos )
| Número de pieza | MAX17085B | |
| Descripción | Integrated Charger Dual Main Step-Down Controllers and Dual LDO Regulators | |
| Fabricantes | Maxim Integrated Products | |
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19-5135; Rev 0; 1/10
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
General Description
The MAX17085B is an all-in-one notebook power solution
integrating a multichemistry battery charger, dual fixed-
output Quick-PWMK step-down controllers, and dual
keep-alive linear regulators:
Charger: The high-frequency (~1.4MHz) multichem-
istry battery charger uses a current-mode, fixed
inductor current ripple architecture that significantly
reduces component size and cost. Low-offset sense
amplifiers allow the use of low-value sense resistors
for charging and input current limit.
The charger uses n-channel switching MOSFETs.
Adjustable charge current, charge voltage, and cell
selection allow for flexible use with different battery
packs. Charge current is set by an analog control input,
or a PWM input. High-accuracy current-sense ampli-
fiers provide fast cycle-by-cycle current-mode control to
protect against short circuits to the battery and respond
quickly to system load transients. Additionally, the char-
ger provides a high-accuracy analog output that is pro-
portional to the adapter current.
An integrated charge pump controls an n-channel
adapter selector switch. The charge pump remains
active even when the charger is off. When the adapter
is absent, a p-channel MOSFET selects the battery.
Main SMPS: The dual Quick-PWM step-down con-
trollers with synchronous rectification generate
the 5V and 3.3V main power in a notebook. Low-
side MOSFET sensing provides a simple low-cost,
highly efficient valley current-limit protection. The
MAX17085B also includes output undervoltage, out-
put overvoltage, and thermal-fault protection.
Separate enable inputs for each SMPS and a com-
bined open-drain power-good output allow flex-
ible power sequencing. Voltage soft-start reduces
inrush current, while passive shutdown discharges
the output through an internal switch. Fast transient
response, with an extended on-time feature reduces
output capacitance requirements. Selectable pulse-
skipping mode and ultrasonic mode improve light-
load efficiency. Ultrasonic mode operation maintains
a minimum switching frequency at light loads, mini-
mizing audible noise effects.
Dual LDO Regulators: An internal 5V/100mA LDO5 with
switchover can be used to either generate the 5V bias
needed for power-up or other lower power “always-on”
suspend supplies. Another 3.3V/50mA LDO3 provides
“always-on” power to a system microcontroller.
Features
S All-in-One Charger Plus Dual Main Step-Down
Controllers
S 5V/100mA and 3.3V/50mA LDO Regulators
S Main
Dual Quick-PWM with Fast Transient Response
and Extended On-Time
300kHz to 800kHz Switching Frequency
Fixed 5V and 3.3V SMPS Outputs
Low-Noise Ultrasonic Mode
Autoretry Fault Protection
S Charger
High Switching Frequency (1.4MHz)
Selectable 2-, 3-, and 4-Cell Battery Voltage
Automatic Selection of System Power Source
Internal Charge-Pump for Adapter n-Channel
MOSFETs Drive
Q0.4% Accurate Charge Voltage
Q2.5% Accurate Input Current Limiting
Q3% Accurate Charge Current
S Monitor Outputs for
AC Adapter Current (Q2% Accuracy)
Battery Discharge Current (Q2% Accuracy)
AC Adapter OK
S Analog/PWM (100Hz to 500kHz) Adjustable
Charge Current Setting
S AC Adapter Overvoltage and Overcurrent
Protection
Applications
Notebook Computers
PDAs and Mobile Communicators
5V and 3.3V Supplies
2-to-4, Li+-Cell, Battery-Powered Devices
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17085BETL+ -40°C to +85°C
40 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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  
www.DataSheet4U.com
Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, no load on LDO5, LDO3, OUT5, OUT3, and REF, VCC = 5V, ON3 = ON5 = VCC, VDCIN = VLXC = VCSSP = VCSSN
= 19V, VBSTC - VLXC = 5V, VBATT = VCSIP = VCSIN = 12.6V, VVCTL = VISET = 1.8V, CELLS = open, TA = 0°C to +85°C, unless oth-
erwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
MAIN SMPS INPUTS AND OUTPUTS
SKIP Threshold Voltage
VSKIP
SKIP Leakage Current
ON_ Input Logic Levels
ON_ Leakage Current
OUT_ Discharge-Mode
On-Resistance
RDSCHG
CONDITIONS
High = SKIP
Mid = PWM
Low = ultrasonic
VSKIP = 0 or 5V, TA = +25°C
High (SMPS on)
Low (SMPS off)
VON3 = VON5 = 0 or 5V, TA = +25°C
ON_ = GND
MIN TYP MAX UNITS
2.3 VCC
1.5 1.9
0 0.8
-2 +2
2.4
0.8
-2 +2
7.5 20
50
V
FA
V
FA
I
SMPS GATE DRIVERS
DH3, DH5 Gate Driver
On-Resistance
RDH3, RDH5
BST3 - LX3 and BST5 - LX5 forced to 5V;
high state
BST3 - LX3 and BST5 - LX5 forced to 5V; low
state
1.6 3.8
1.6 3.8
I
DL3, DL5 Gate Driver
On-Resistance
RDL3, RDL5
DL3, DL5; high state
DL3, DL5; low state
1.5 3.5
0.6 1.5
I
DH3, DH5 Gate Driver Source/
Sink Current
IDH
DH3, DH5 forced to 2.5V,
BST3 - LX3 and BST5 - LX5 forced to 5V
2
A
DL3, DL5 Gate Driver
Source Current
IDL(SOURCE) DL3, DL5 forced to 2.5V
1.7 A
DL3, DL5 Gate Driver
Sink Current
IDL(SINK) DL3, DL5 forced to 2.5V
3.3 A
DHC Gate Driver On-
Resistance
DLC Gate Driver
On-Resistance
Internal BST_ Switch
On-Resistance
RDHC
RDLC
RBST
High state, IDHC = 10mA
Low state, IDHC = -10mA
High state, IDLC = 10mA
Low state, IDLC = -10mA
IBST_ = 10mA, VDD = 5V
1.5 3
0.8 2.1
36
36
5
I
I
I
BST_ Leakage Current
CHARGER SMPS
DHC Off-Time K Factor
Sense Voltage for Minimum
Discontinuous Mode Ripple
Current
Zero Crossing Comparator
Threshold
IBST
VBST_ = 24V, OUT3 and OUT5 above
regulation threshold, TA = +25°C
VDCIN = 19V, VBATT = 10V
VCSIP - VCSIN
VCSIP - VCSIN
2
30 35
5
10
20 FA
40 ns/V
mV
mV
Cycle-by-Cycle Current- Limit
Sense Voltage
VCSIP - VCSIN
120 125
130
mV
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, no load on LDO5, LDO3, OUT5, OUT3, and REF, VCC = 5V, ON3 = ON5 = VCC, VDCIN = VLXC = VCSSP = VCSSN
= 19V, VBSTC - VLXC = 5V, VBATT = VCSIP = VCSIN = 12.6V, VVCTL = VISET = 1.8V, CELLS = open, TA = -40°C to +85°C, unless
otherwise noted.) (Note 4)
PARAMETER
SYMBOL
INPUT SOURCE-CURRENT REGULATION
Input Source-Current Limit
Threshold
VCSS
CSSP/CSSN Input-Voltage Range
IINP Current-Sense Amplifier
Voltage Gain
GIINP
IINP Output-Voltage Range
IINP Accuracy
IINP Gain Error
IINP Offset Error
ACIN, ACOK, AND ACOV
ACOK Detect Threshold
VACINOK
ACOV Detect Threshold
VACINOV
ACOK Sink Current
ADAPTER PRESENT DETECTION
Adapter Absence Detect
Threshold
Adapter Detect Threshold
CHARGE-PUMP MOSFET DRIVER
CONDITIONS
VCSSP - VCSSN
VCSSP - VCSSN = 60mV
VCSSP - VCSSN = 40mV
VCSSP - VCSSN = 20mV
Measured at VCSSP - VCSSN = 60mV and
VCSSP - VCSSN = 20mV
Measured at VCSSP - VCSSN = 60mV and
VCSSP - VCSSN = 20mV
Measured at ACIN rising, hysteresis = 40mV
(typ)
Measured at ACIN rising, hysteresis = 40mV
(typ)
VACOK = 0.4V, VACIN = 1.7V
VDCIN - VBATT, VDCIN falling
VDCIN - VBATT, VDCIN rising
MIN
58.5
-2.5
5
59.9
0
-2
-3
-4
-1.5
-0.65
1.47
-2
2.05
-2.38
1
0
300
TYP
MAX UNITS
61.5
+2.5
26
60.1
4
+2
+3
+4
+1.5
mV
%
V
V/V
V
%
%
+0.65 mV
1.53
+2
2.15
+2.38
V
%
V
%
mA
200 mV
600 mV
PDSL Gate-Driver Output
Voltage High
VPDSL_H VDCIN = 19V
VDCIN +
5.3
V
Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = PGND, VBST = 5V,
and a 500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be dif-
ferent due to MOSFET switching speeds.
Note 4: Specifications to TA = -40°C are guaranteed by design and not production tested.
______________________________________________________________________________________ 11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX17085B.PDF ] | |
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