LTC3331_15 Datasheet, PDF (6/34 Pages) Linear Technology – Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger

LTC3331
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = 5V, BAT_IN = BAT_OUT = BB_IN = 3.6V,
SHIP = OV, SCAP = 0V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_BAL
Supercapacitor Balance Point
Percentage of SCAP Voltage
l 49
50
51
%
V_IH
Digital Input High Voltage
Pins: OUT[2:0], SHIP, FLOAT[1:0], LBSEL, IPK[2:0], l 1.2
V
UV[3:0]
V_IL
Digital Input Low Voltage
Pins: OUT[2:0], SHIP, FLOAT[1:0], LBSEL, IPK[2:0], l
UV[3:0]
0.4
V
I_IH
Digital Input High Current
Pins: OUT[2:0], SHIP, FLOAT[1:0], LBSEL, IPK[2:0],
UV[3:0]
0
10
nA
I_IL
Digital Input Low Current
Pins: OUT[2:0], SHIP, FLOAT[1:0], LBSEL, IPK[2:0],
UV[3:0]
0
10
nA
V_OH
PGVOUT, Output High Voltage
BB_IN = 5V, 1µA Out of Pin
EH_ON Output High Voltage
V_IN = 6V, 1µA Out of Pin
V_OL
PGVOUT, EH_ON Output Low Voltage BB_IN = 5V, 1µA into Pin
l 4.0
l 3.8
l
V
V
0.4
V
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 LTC3331 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3331E is guaranteed to meet specifications from 0°C to
85°C. The LTC3331I is guaranteed over the –40°C to 125°C operating
junction temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3: T_J is calculated from the ambient T_A and power dissipation PD
according to the following formula: T_J = T_A + (P_D • θ_JA).
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The PGVOUT Rising threshold is equal to the sleep threshold. See
V_OUT specification.
Note 6: These quiescent currents include the contribution from the internal
resistor divider at the BAT_OUT pin as BAT_OUT must be tied to BB_IN for
all applications.
Note 7: The buck-boost operating voltage is further constrained to a
narrower range by the programmed float voltage and the selected low
battery disconnect and connect thresholds.
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
V_IN Quiescent Current in UVLO
vs V_IN
2200
2000
1800
125°C
1600
1400
1200
85°C
1000
800
25°C
600
400
–40°C
200
0
0
3
6
9 12 15 18
V_IN (V)
3331 G01
V_IN Quiescent Current in Sleep
vs V_IN
6000
5000
4000
3000
2000
1000
125°C
85°C
25°C
–40°C
0
3
6
9
12
15
18
V_IN (V)
3331 G02
Buck-Boost Quiescent Current in
Sleep vs BB_IN
2500
2250
2000
BAT_OUT TIED TO BB_IN
125°C
1750
1500
1250
1000
750
85°C
25°C
–40°C
500
250
0
2.1 2.4 2.7 3 3.3 3.6 3.9 4.2
BB_IN (V)
3331 G03
3331fb
6
For more information www.linear.com/LTC3331