Linear Technology LTC4000, Datasheet

Page: 5 / 40

LTC4000
5
4000fb
For more information www.linear.com/LTC4000
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4000 is tested under conditions such that T
J
≈ T
A
. The
LTC4000E is guaranteed to meet specifications from 0°C to 85°C junction
temperature. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC4000I is guaranteed over the
full –40°C to 125°C operating junction temperature range. Note that the
maximum ambient temperature consistent with these specifications is
elecTrical characTerisTics
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
CLN
= 3V to 60V unless otherwise noted (Notes 2, 3).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery PowerPath Control
Battery Discharge PowerPath Forward
Regulation Voltage
V
BAT,CSN
, 2.8V ≤ V
BAT
≤ 60V
l
0.1 8 20 mV
Battery PowerPath Fast Reverse Turn-Off
Threshold Voltage
V
BAT,CSN
, 2.8V ≤ V
BAT
≤ 60V, Not
Charging, V
BGATE
= V
CSN
– 2.5V,
∆I
BGATE
/∆V
BAT,CSN
≥ 100μA/mV
l
–90 –50 –20 mV
Battery PowerPath Fast Forward Turn-On
Threshold Voltage
V
BAT,CSN
, 2.8V ≤ V
CSN
≤ 60V,
V
BGATE
= V
BAT
– 1.5V,
∆I
BGATE
/∆ V
BAT,CSN
≥ 100μA/mV
l
40 80 130 mV
Battery Gate Turn-Off Current V
BGATE
= V
CSN
– 1.5V, V
CSN
≥ V
BAT
,
V
OFB
< V
OUT(INST_ON)
and Charging
in Progress, or V
CSN
= V
BAT
and Not
Charging
–0.3 μA
Battery Gate Turn-On Current V
BGATE
= V
BAT
– 1.5V, V
CSN
≥ V
BAT
,
V
OFB
> V
OUT(INST_ON)
and Charging in
Progress, or V
CSN
= V
BAT
– 20mV
0.3 μA
I
BGATE(FASTOFF)
Battery Gate Fast Turn-Off Current V
CSN
= V
BAT
+ 0.1V and Not
Charging, V
BGATE
= V
CSN
– 3V
–0.5 mA
I
BGATE(FASTON)
Battery Gate Fast Turn-On Current V
CSN
= V
BAT
– 0.2V,
V
BGATE
= V
BAT
– 1.5V
0.7 mA
V
BGATE(ON)
Battery Gate Clamp Voltage I
BGATE
= 2μA, V
BAT
= 12V to 60V,
V
CSN
= V
BAT
– 0.5V, Measure
V
BAT
– V
BGATE
l
13 15 V
Battery Gate Off Voltage I
BGATE
= – 2μA, V
BAT
= 2.8V to 60V,
V
CSN
= V
BAT
+ 0.5V and not Charging,
Measure V
CSN
– V
BGATE
l
0.45 0.7 V
BIAS Regulator Output and Control Pins
V
BIAS
BIAS Output Voltage No Load
l
2.4 2.9 3.5 V
∆V
BIAS
BIAS Output Voltage Load Regulation I
BIAS
= – 0.5mA –0.5 –10 %
BIAS Output Short-Circuit Current V
BIAS
= 0V –12 mA
Transconductance of Error Amp CC = 1V 0.5 mA/V
Open Loop DC Voltage Gain of Error Amp CC = Open 80 dB
I
ITH(PULL_UP)
Pull-Up Current on the ITH Pin V
ITH
= 0V, CC = 0V –6 –5 –4 μA
I
ITH(PULL_DOWN)
Pull-Down Current on the ITH Pin V
ITH
= 0.4V, CC = Open
l
0.5 1 mA
Open Loop DC Voltage Gain of ITH Driver ITH = Open 60 dB
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T
J
, in °C) is calculated from the ambient
temperature (T
A
, in °C) and power dissipation (P
D
, in Watts) according to
the following formula:
T
J
= T
A
+ (P
D
• θ
JA
), where θ
JA
(in °C/W) is the package thermal
impedance.
Note 3: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 4: These parameters are guaranteed by design and are not 100%
tested.