Datasheet

bq25504
www.ti.com SLUSAH0A –OCTOBER 2011–REVISED SEPTEMBER 2012
THERMAL INFORMATION
bq25504
THERMAL METRIC
(1)(2)
UNITS
RGT (16 PINS)
θ
JA
Junction-to-ambient thermal resistance 48.5
θ
JCtop
Junction-to-case (top) thermal resistance 63.9
θ
JB
Junction-to-board thermal resistance 22
°C/W
ψ
JT
Junction-to-top characterization parameter 1.8
ψ
JB
Junction-to-board characterization parameter 22
θ
JCbot
Junction-to-case (bottom) thermal resistance 6.5
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(2) For thermal estimates of this device based on PCB copper area, see the TI PCB Thermal Calculator.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
V
IN (DC)
DC input voltage into VIN_DC
(1)
0.13 3 V
VBAT Battery voltage range
(2)
2.5 5.25 V
C
HVR
Input capacitance 4.23 4.7 5.17 µF
C
STOR
Storage capacitance 4.23 4.7 5.17 µF
C
BAT
Battery pin capacitance or equivalent battery capacity 100 µF
C
REF
Sampled reference storage capacitance 9 10 11 nF
R
OC1
+ R
OC2
Total resistance for setting for MPPT reference. 18 20 22 MΩ
R
OK
1 + R
OK
2 + R
OK3
Total resistance for setting reference voltage. 9 10 11 MΩ
R
UV1
+ R
UV2
Total resistance for setting reference voltage. 9 10 11 MΩ
R
OV1
+ R
OV2
Total resistance for setting reference voltage. 9 10 11 MΩ
L
BST
Input inductance 19.8 22 24.2 µH
T
A
Operating free air ambient temperature –40 85 °C
T
J
Operating junction temperature –40 105 °C
(1) Maximum input power ≤ 300 mW. Cold start has been completed
(2) VBAT_OV setting must be higher than VIN_DC
ELECTRICAL CHARACTERISTICS
Over recommended temperature range, typical values are at T
A
= 25°C. Unless otherwise noted, specifications apply for
conditions of VIN_DC = 1.2V, VBAT = VSTOR = 3V. External components L
BST
= 22 µH, C
HVR
= 4.7 µF C
STOR
= 4.7 µF.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
BOOST CONVERTER \ CHARGER STAGE
V
IN(DC)
DC input voltage into VIN_DC Cold-start completed 130 3000 mV
I
IN(DC)
Peak Current flowing from V
IN
into VIN_DC input 0.5V < V
IN
< 3 V; VSTOR = 4.2 V 200 300 mA
P
IN
Input power range for normal charging VBAT > VIN_DC; VIN_DC = 0.5 V 0.01 300 mW
VBAT < VBAT_UV; VSTOR = 0 V;
Cold-start Voltage. Input voltage that will start
V
IN(CS)
330 450 mV
charging of VSTOR
0°C < T
A
< 85°C
Minimum cold-start input power to start normal VBAT < VBAT_UV; VSTOR = 0 V; Input source
P
IN(CS)
10 50 µW
charging impedance 0 Ω
Voltage on VSTOR when cold start operation ends
V
STOR_CHGEN
1.6 1.77 1.95 V
and normal charger operation begins
Resistance of switch between VBAT and VSTOR
R
BAT(on)
VBAT = 4.2 V; VSTOR load = 50 mA 2 Ω
when turned on.
VBAT = 2.1 V 2
Charger Low Side switch ON resistance Ω
VBAT = 4.2 V 2
R
DS(on)
VBAT = 2.1 V 5
Charger rectifier High Side switch ON resistance Ω
VBAT = 4.2 V 5
f
SW_BST
Boost converter mode switching frequency 1 MHz
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